Hammarlund HQ-100A Series User manual

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I HQ-IO A
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\. RECEIVER
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Hammarlund Manufaduring Company
A Giannini Scientific Co.
73-88 HAMMARLUND DRIVE
MARS HILL. NORTH CAROLINA
9001-06-00005
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THE HQ-IOOA SERIES
COMMUNICATIONS
RECEIVERS
INSTRUCTION AND SERVICE INFORMATION
ESTABUSHED 19]0
ISSUE 3
1r1 order to receive the full unconditional gO-day warranty against
defective material
arJd workmanship in this receiver, the warranty
card must
be filled out and mailed within two weeks of purchase.
Please
refer to serial number of warranty in correspondence.
THE HAMMARLUND MANUFACTURING CO.
73-88 Harnrnarlund Drive
Mars Hill, North Carolina 28754
II
I
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Figure I. Tbe HQ·IOOA Receiver
TUBE AND DIODE COMPLEMENT
Symbol
Type Tube
Function
VI 6BZ6 Pentode RF Amplifier
V2
6BE6 Pentagrid
Converter Mixer
V3
6C4 Triode
HF Os cillator
V4A
1!212AX7 Triode
First AF Amplifier
V4B 1!212AX7 Triode
Q-Multiplier
V5 6BA6 Remote
Cutoff Pentode First IF Amplifier
v6
6BA6
Remote Cutoff Pentode
Second IF Amplifier
V7
6BV8 Twin Diode,
Triode Detector,
Serie s Nois e Limiter, BFO
V8
6AQ5
Beam Power Amplifier
Audio Power Output
V9
OB2
Gas Filled Diode
Voltage Regulator
CRI
Cer 72c Diode,
Silicon
Rectifier
CR2
Cer 72c Diode,
Silicon
Rectifier
ii
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INTRODUCTION
The Hammarlund HQ-l OOA is an all-new communications receive r
representing entirely new concepts in electrical and mechanical design.
It will provide years of top performance with minimum maintenance.
The HQ-100A series receivers have a self-contained power supply and
a universal transformer capable of operation from a 117 volt 60 cp/s
or 220/230 volt 50/60 cp/s source, provided the proper adapter plug
(P2) is installed.
The HQ-lOOA is a superheterodyne receiver with a frequency cover-
age continuously tunable from 540 KCS to 30 MCS with extremely fine
control in separation of crowded signals. A very high signal-to-noise
ratio plus the famous Hammarlund noise limiter circuit, permits full
use of the receiver's excellent sensitivity on the weakest signals. A
Q-Multiplier is provided for varying the selectivity of the receiver.
Red segments on the main tuning dial indicate wherein the majority
of the international short wave stations can be located.
Electrical band spread tuning is provided with direct calibration eve ry
10 KCS on 80, 40, and 20 meter bands; every 20 KCS on the 15 meter
band and every 50 KCS on the 10 meter band. In addition, an arbitrary
band spread logging scale is provided for use throughout the tuning range
of the receiver. CB Channels are also indicated.
A new audio output circuit feature is the Auto-Response which auto-
matically narrows and widens the frequency range of the audio output,
depending upon the gain required. This feature permits the receiver
to be used as a high-fidelity receiver on stronger signals, while pro-
viding the sharp cutoff required in receiving communication b"gnals.
A second advantage of the Hammarlund Auto-Response is the rapid
damping of the audio power in the speaker voice coil which greatly min-
imizes undesirable speaker "hangover." The receiver may be used
with eithe r speaker or headphone s. Fast acting AVC maintains a constant
audio leveL Adequate filtering practically eliminates AC power ripple.
The HQ-lOOA is equipped with a stable beatfrequency oscillator which
provides the operator with a continuous range of audio tones when re-
cei ving telegraph code signals, or excellent single - side band reception.
An "S" meter is provided to obtain accurate reading on received phone
signals and to assure "on-the-nose" tuning. A send-receive switch is
provided to silence the receiver while transmitting.
Large, comfortable controls in logical groupings are provided for
greate st operating ease. The new futuristic front panel is clearly marked
to permit full attention to the operating at hand.
The HQ-lOOA was designed with you in mind. You'll have many
hours of pleasure and use in operating this truly fine communications
instrument.
1
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RECEIVER
figure 2. Installation of Single-wire Antenna
300 OHM TV TWIN LEAD
RECEIVER
figure 3. Installation of folded Dipole Antenna
2
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INSTALLATION
UNPACKING
Unpack the receiver carefully. Make sure the tubes,
associated tube shields and pilot lamps are in place.
SPEAKER CONNECriON
Connect a 3.2 ohm permanent magnet dynamic
speaker (Hammar lund S-100 Speaker) to the two ter-
minals marked SPKR. on the rear of the chassis.
(Note Figure 4). For best performance do not place
speaker on top of receiver cabinet.
POWER CONNEUIONS
Before inserting attachment plug into power outlet,
make certain power source is of proper voltage and
frequency. (Refer to paragraph one of INTRODUC-
TION. )
INSTALLING ANTENNA
The HQ-100A is designed to operate with a single
wire or a balanced type antenna. The front panel an-
tenna trimmer control (Figure 5) permits a good
match to most antennae systems of 50 to 600 ohms.
For general coverage, single wire antennae of 20
to 50 feet length will provide surprisingly good recep-
tion. A long single wire outdoor antenna, such as
shown in Figure 2, will generally provide entirely
satisfactory performance. This wire may be 50 to
150 feet long.
For best reception, the antenna should be isolated
as much as possible from neighboring objects and at
right angles to power lines or busy highways so as to
minimize possible interference pickup.
Optimum performance on a particular amateur band
or other narrow tuning range will be obtained by using
a tuned half-wave dipole or folded dipole fed with 300
ohm transmission line or other suitable lead-in, as
shown in Figure 3.
To tune the one-half wave length dipole, the follow-
ing formula for the length of the antenna may be used:
Length (feet) = Fre~~8(MCS)
Each half (1/4 wave length) is half the length found
from the above formula.
A good ground, although not always necessary, will
generally aid in reception and reduce stray line hum.
Reversal of polarity of power cord plug may possibly
further reduce line hum in some locations.
CABINET
CHASSIS
o
METER
ZERO
3.2 OHMS PHONES ADJUST
o
o
figure 4. Connection Points at Rear of Chassis
3
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17
1
2
3
INDEX
NO.
1
2
3
4
5
6
7
8
INDEX
CONTROL
NO.
Automatic Clock-Timer Control
9
Function Switch
10
ANTENNA Trimmer
11
MAIN TUNING Control
12
SENSITIVITY Control
13
MAN. -AVC Switch
14
Band Selector Switch
15
Noise Limiter Switch
16
17
Figure 5. location of Controls
CONTROL
AUDIO GAIN Control
Electrical BAND SPREAD Control
SELECTIVITY Control, Q - Multiplier
Frequency Control, Q - Multiplier
"S" Meter
Electrical Band Spread Dial
BFO Frequency Control
Main Tuning Dial
Telechron Automatic Clock-Time.
j
I
I
I
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OPERATION
Basically, all that is necessary to operate a radio
receiver are the tuning and volume controls. The addi-
tional controls found on the front panel of a communica-
tions receiver such as the HQ-100A, control functions
which greatly improve operating performance and make
possible reception of oth~rwise unintelligible signals.
NORMAL CONTROL SETTINGS
For "normal" operation such as broadcast, short
wave listening, etc .• the position of the various con-
trols should be as follows:
Function Switch . . ·
Receive (REC.)
ANTENNA
Trimmer
· Tune for highest "S"
meter reading on sig-
nal.
MAIN TUNING Control . . . Tune for highest "S"
meter reading on sig-
nal.
SENSITIVITY Control
· Fully clockwise
MAN. -A VC Switch. . · AVC
Band Selector (TUNING. ·
Set to desired frequen-
RANGE MCS)
Switch cy range.
Noise Limiter Switch
· OFF
AUDIO GAIN Control.
· Adjust for proper lev-
el.
BAND SPREAD Control.
· Set counterclockwise to
"100" on band spread
dial.
SELECTIVITY Control . . . OFF
Frequency (FREQ. ) Control . Set pointer to trian-
gular marking.
CODE SIGNAL RECEPTION
For reception of code signals, the controls should
be set as follows:
Function Switch . . ·
BFO
ANTENNA
Trimmer · Peak for maximum out-
put on "S" meter.
MAIN TUNING Control
· Peak for maximum out-
put on "S" ,meter.
SENSITIVITY
Control
Adjust for desired out-
put level.
MAN. -A VC Switch .
Manual (MAN.)
Band Selector (TUNING
Set to desired frequen-
RANGE MCS)
Switch
cy range.
Noise Limiter Switch .
OFF or ON as required
by local noise condi-
tions.
AUDIO GAIN Control . 2/3
to 3/4 clockwise ro-
tation.
SELECTIVITY Control ON position
BFO FREQ Control.
Tune signal to zerobeat
with pointer on zero and
then offset either left or
right for des ired pitch.
FUNUION SWITCH
Three operating and an OFF position are provided.
For AM reception the REC position is used. CW or
SSB signals may be received with the FUNCTION
switch on BFO. If the receiver is used with a trans-
mitter the switch should be in the SEND position.
SINGLE SIDE BAND OPERATION
The setting of the controls for Single Side Band
reception is the same as for CW reception with the
BFO being used for carrier reinsertion. The BFO fre-
quency control should be set approximately 2-1/2
divisions to the left or right of the zero indice, de-
pending upon whether the upper or lower sideband
intelligence is desired. Final tuning should be accom-
plished with the BAND SPREAD control in order that
proper speech registry be achieved.
BAND SPREAD OPERATION
The BAND SPREAD control may be used for fine tun-
ing by Betting it at apprOXimately gO'on the band spread
5
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m
dial and tuning in the signal with the MAIN TUNING
control. Final peaking of the signal is then accom-
plished by adjustment of the BAND SPREAD control.
It should be understood that the setting of the BAND
SPREAD
control will affect the Main Dial calibration
in that a higher frequency setting of the main tuning
dial will be required. Rotating the band spread dial
from 100 toward 0 tunes the receiver to a lower
frequency.
For Band Spread operation in the amateur bands, the
following procedure must be followed: The main tuning
dial is set to the line marking the high frequency (right-
hand end) of a given amateur band. The Band Spread
tuning and calibration may then be accomplished solely
with the BAND SPREAD control and dial.
20BS SWITCH POSITION
A separate switch position is provided on the
TUNING RANGE control for spreading the 20-meter
band. This switches in another band spread capacitor
for optimum spreading of this band.
TElECHRON AUTOMATIC TIMER
If your receiver is equipped with the built-in 24
hour Telechron Automatic Clock-Timer, the following
instructions should be noted:
Every radio-frequency device is stable only at pre-
determined operating temperatures. In order to elim-
in ate waiting for receiver to warm-up to operating
temperature,' the Telechron'Timer automatically turns
on the receiver ahead of anticipated operating time.
This is accomplished by setting the hand of the timer
(small knob at rear of receiver) to approximately one-
half hour before operating hour. The front panel con-
trol under Timer is then set to "Auto" position. The
function
switch is set to REC. The receiver is then
automatically turned on at the desired time.
The clock hands are set by the rear knob. Push in
on the knob to set the switch timing hand and pull out
on the knob to
set the clock hands. The front switch
is setto AUTO and the operation switch is set to REC.
when
it is desired to use the automatic clock switch
for pre-warming the receiver before operation or for
use as an alarm to turn the receiver on to a pre-tuned
station. To use the operation switch normally, the
clock switch should be left in the ON position.
The clock will continueto run as long as the receiver
line cord is connected to the power outlet, and is ex-
tremelyusefulfor checking sign-in periods and sched-
ules.
If your receiver is not equipped with the Telechron
Automatic Clock-Timer, and youwould care to have the
accessory added, clock kits, with full installation
instructions. may be had by writing
Harnmarlund Manufacturing Co.
73-88 Harnrnarlund Drive, Mars Hill, North Carolina
or by contacting the nearest Harnrnarlund dealer.
POSSI BlE RECEIVER 01 FFI (Ul TI ES
1. If, upon turning the function switch from "off" distortion is preferable to excessive pulse type
to "receive" position, the dials are not illumi- noise, such as ignition interference.
nated and the receiver fails to operate after two
minutes, this indicates that the clock timer
3. Erratic S meter performance, lack of sufficient
switch just above the function switch is nat·in
variation, etc., is usually due to the two 6BA6
the proper position. This switch should always
tubes employed in the S meter circuit. These
be in the ON position unless auto timer is em-
are the tw06BA6tubes, V5 and V6, in the sche-
ployed.
matic diagram. Merely interchanging these
tubes will sometimes provide sufficient im-
provement. Replacing one or both may be found
2.
Excessive hum or failure of the Qmultiplier to
advisable before suspecting other troubles.
operate properly will usually be due to a de-
fective 12AX7 type tube. Such a defective tube 4. Excessive drift, after allowing sufficient time
may test good in a tube tester but be unsatis- for warm up, may be due to a poor type 6C4
factory because of higher than normal heater-
tube, V3, in
the diagram or 6BE6, V2, in the
to-cathode leakage. Poor noise limiter action schematic diagram.
is usually due to a poor or defective 6BV8 type
tube. The use of the noise limiter will result in Ninety-nine percent of all receiver trouble has been
some distortion which must be tolerated for found to be due to one or more defective tubes. This
most efficient noise limiting. Because of this"
can undoubtedly b e attributed to the rough handling
when
listening to broadcast stations or oth'er equipments receive in shipment. Please, therefore,
strong local signals, the noise limiter switch
be sure to follow the above suggestions in addition to
should be in the "off" position unless the slight
haVing
all tubes tested before writing the Home Office.
6
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CIRCUIT THEORY
The HQ-100A basically a single conversion, four-
band, superheterodyne receiver with a noise limiter .Its
circuitry incorporates a Q-Multiplier for full control
of selectivity and a stable, beat frequency oscillator.
PRESELEGION
The antenna input coupling and RF amplifier stage
provide the necessary preselection and gain for high
performance and rejection of undesired signals. The
high signal level at the mixer grid, V2, contributes
to a favorable signal-to-noise ratio.
Both grid and plate circuits of the RF stage are
tuned; individual tuning coils are selected for each
band.
The antenna compensating compacitor, adjustable
from the front panel, permits the receiver to be
resonated for optimum performance with the par-
ticular antenna in use.
CONVERTER STAGE
A high degree of oscillator stability is attained by
the use of a separate mixer (6BE6), V2, and an inde-
pendent oscillator (6C4), V3.
The output signal from RF amplifier Vl is heter-
odyned with the output of the local high frequency
oscillator, V3, and electronically combined within
the mixer tube, V2,. On the four frequency ranges
the local oscillator is 455 KCS above the signal fre-
quency.
Low-loss tube sockets, low-loss, phenolic temper-
ature compensating capacitors, and stable, coaxial
trimmers all contribute to oscillator stability. Addi-
tional frequency stability is attained by applying regu-
lated voltage to the oscillator circuit and by the rugged
construction of the entire HF oscillator section as-
sembly.
Q MULTIPLIER
The Q-Multiplier frequency control prOVides a
means of peaking any signal within the pass band of
the IF amplifier. The degree of peaking is controlled
by the SELECTIVITY control. This same SELECTI-
VITY control when turned completely counter-clock-
wise disconnects the Q-Multiplier.
If interference is experienced, either between sta-
tions close to one another or from an interfering SW
signal, gradually advance the Q-Multiplier selectivity
control from its normally off or extreme counterclock-
wise position. This will result in increased selecti-
vity by producing a spike of narrow bandwith that is
adjustable from approximately 3 KCS to 100 cycles
in width. The narrowest bandwith being obtained by
adjustment of the Q-Multiplier selectivity control
to the point just below that which would cause the
Q-Multiplier to break into self-oscillation as evi-
denced by the receiver blocking with a resultant loss
of volume.
The Q-Multiplier is generally never employed on
the standard broadcast band or when short wave
broadcast stations are being received. The use of the
Q-Multiplier under these circumstances will only
result in limiting the frequency response of the broad-
cast band and short wave broadcast stations in view
of the very narrow band width that is provided by the
Q-Multiplier. Of course, the SELECTIVITY control
will make it possible to control this response charac-
teristic. If, by chance, when receiving foreign short
wave broadcast stations interference is experienced
caused by two stations operating very close to one
another, the Q-Multiplier maybe employed under these
circumstances to minimize, if not eliminate, the inter-
ference by the improved selectiVity or decreased band
width proper adjustment will provide. The proper use
of the Q-Multiplier can actually enhance many times
the result obtained with this receiver. In viewof this" it
is suggested that a little time be spent in learning just
how to properly adjust the Q-Multiplier frequency and
selectivity controls under different receiving condi-
tions. As the Q-Multiplier SELECTIVITY control is
advanced, a decided decrease in noise will be ap-
parent. This is due to the narrowing of the pass band.
On AM phone signals this control will usually be be-
tween the 7 and 11 o'clock positions. The FREQUEN-
CY control should then be adjusted for clarity of sig-
nal or for minimum adjacent channel interference.
The SELECTIVITY control may be advanced progres-
sively more for SSB and CW reception. The more
this c·ontrol is advanced, the more critical the setting
of the FREQUENCY control becomes. Advancing the
SELECTIVITY control too far will cause the Q-Multi-
plier to oscillate. This should be avoided. The Q-
Multiplier is a very handy tool in the hands of an
experienced operator and, unfortunately, it is beyond
the
scope of this instruction manual to attempt to be
more definite than we have.
IF AMPLIFIER
Seven, stable tuned circuits, in two stages of IF
amplification (V5 and V6), contribute to sensitivity
and selectivity. Iron core permeability-tuned trans-
formers improve performance and add to the ease of
adjustment. The intermediate frequency is 455 KCS,
the EIA
standard.
Ave SYSTEM
Automatic Volume Control minimizes fading and
signal strength variations by controlling the gain of
the RF stage Vl and the IF stage V5. As a result,
a comfortable and constant level ofaudio is maintained.
7
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"S" METER ICARRIER LEVEl]
The "S", or Tuning, Meter is provided to assist
in tuning and to give an indication of relative signal
strength. Because the meter reading are propor-
tional to AVC voltage, it is operative only in the AVC
position.
The meter, which is calibrated to 40 db over S-9,
is factory adjusted so that a signal input of approxi-
mately 50 microvolts gives a reading of S-9. Each
"S" unit indicates a 6 db increase, eqUivalent to doub-
ling signal strength. Should meter readjustment be
necessary:
L Set function switch to REC.
2. Set front panel SENSITIVITY control to "10" and
Q-Multiplier SELECTIVITY control to OFF.
3. With receiver off, mechanically zero pointer
with a fine screwdriver.
4. With A VC on and the ANT. terminals shorted,
zero pointer with ZERO ADJ potentiometer
R-15.
DETECTOR AND NOISE LIMITER
One diode section of the 6BV8 tube, V7, is used for
the second detector and AVC system. This system
produced a minimum of distortion.
The other diode of V7 operates as a series, self-
adjusting noise limiter. It will reduce automobile
+4
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-16
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-20
-22
ignition and other types of impulse noise to a mll1l-
mum. Intelligibility is not affected by the noise lim-
iter, although it may be switched off if desired.
BEAT FREQUENCY OSCILLATOR IBFO]
The BFO is activated by the FUNCTION switch for
reception of CW or SSB signals or as an aid in loca-
ting weak SW broadcast stations. The BFO control
is used under these conditions to vary the pitch. Each
calibration diVision of this control represents approx-
imately 1000 cycles. When receiving single side band
transmission, the generally accepted procedure of
setting the beat frequency oscillator approximately
1000 cycles above or below zero beat should be em-
ployed. In other words, if the beat frequency oscil-
lator FREQ. control is set one degree clockwise or
counterclockwise from the center position, optimum
single side band reception will usually be obtained.
Whether the beat frequency oscillator control will be
set clockwise from zero beat will depend on whether
upper or lower side band is being transmitted. If the
beat frequency oscillator is on the wrong side of zero
beat, it may be impossible to obtain intelligibility of
the
single side band signal when the band spread dial
is tuned very slowly through the single Side band sig-
signal. Should such a condition arise, merely rotate
the FREQ. control from the one degree counterclock-
wise to the one degree clockwise position and then
very carefully adjust the BANDSPREAD for intelligi-
ble speech. The BFO frequency control may also be
16
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HQ'IOO AudiO Chara"er'lt"
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A - Ma •. A F Gain Comrol
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8 - - - AF Gain Appro. 2S ~ of r.tali."
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fro .. Min. Simulrting Averaq41
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Settin9 for 11><0 8roadcal;t
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StcItiont ( IV at A"t4lll"a In""t )
, Output
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I_t .10V A,rou AF Cla,n Control Cow .. ont
B Input 1.4V
A"auAFGoinC ... lrol C.OIl1OIo"I
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10
1
10)
Frequency ,n Cycles Per Second
figure 6. Auto-Response Cur"e
8
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----------------@
employed as a fine tuning adjustment to obtain desired
speech quality. Here again experience is the best
teacher. The stability of both the high frequency os-
cillator and the beat frequency oscillator employed
in this receiver plus the excellent mechanical rigi-
dity will prOVide excellent single side band reception.
Refer to the paragraph on the Q-Multiplier operation
for increase selectivity or narrowing of the passband
usually permissable with CW and sideband reception.
It may be found desirable to place the function switch
on BFa while tuning to aide in locating weak signals.
As a result of activating the BFO, each carrier tuned
in will produce a beat note or whistle easily discern-
able. If a phone signal is located in this manner,
adjust the bands pre ad tuning control for the lower
pitch tone or zero beat. This will result in centering
the desired phone signal and now placing the function
switch on REC will allow for normal AM operation.
AUDIO AMPI.IFIER
The first audio stage is a resistance coupled voltage
amplifier employing the other section of the l2AX7
(V4B).
The audio output stage is a 6AQ5 beam power
amplifier (V8) prOViding an undistorted output level of
at least one watt.
A
feature ofthe audio system is the variable negative
feedback employed (see Auto-Response Curve, Figure
6). Maximum feedback is provided at low settings of
the AUDIO GAIN control for the fine quality reception
of local broadcast and strong short wave stations.
As the AUDIO GAIN control is increased, the feedback
decreases so that on reception of weak signals addi-
tional selectivity is prOVided by the audio section. This
results in an increased signal-to-noise ratio. A further
advantage is the critical damping of the speaker for
elimination of speaker "hangover". This upgrades
the reception of speech and music and decreases the
noise output of the receiver. A further advantage is
the reduction of distortion at lower settings of the
AUDIO GAIN control.
ACCESSORIES
A
Now you can get even more out of your HQ-lOOA
This is not usually required by the average short
receiver!
wave listener, although it will prove an aid as a means
of correcting for possible dial error.
The amateur operator will find this of most value
The XC-lOO Crystal Calibrator is available, pro-
since the 100 KCS checkpoints this unit provides, will
viding checkpoints every 100 KCs within the range of
make it possible to accurately set amateur band edges.
the
receiver.
This will result in improving the accuracy of the am-
ateur band spread dial, by determining the exact set-
ting of the main tuning dial.
The kit is qUickly and easily installed. It is com-
plete with eas y-to-follow instructions ,operating switch
and mounting hardware.
9
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®--------------
SERVICE AND
REALIGNMENT PROCEDURE
NOTE
To service this receiver, disconnect from power source and remove all
leadwires attached to terminal connections at rear of chassis apron.
Carefully turn the receiver up onto the front panel face on a smooth clean
surf~ce. Remove the two #10 hex machine screws at the extreme ends of
the chassis apron at the rear of the cabinet, and the knob from the clock
adjustment shaft if receiver is so equipped. Lift cabinet straight up and
off of chassis. To reassemble, use reverse procedure.
ANTENNA ADJUSTME.II.IS
/ ADJUST SUJG AT 4MC ADJUST SWG AT 1.2 M.C ADJUST SLUG AT L65 Me ADJUST SWG AT IOMC \
WITH
ANT. CAPACITOR
WITH ANT. CAPACITOR WITH ANT. CAPACITOR WITH ANT.
CAPACITOR
NEAR MID. CAPACITY NEAR M I N.CAPACITY NEAR MID.CAPACITY
NEAR MID CAPACITY
•
IF ADJUSTMENTS
TOP SLUG ADJUST AT
AT 1.65 MC FOR MAX. AT
4MC BOTTOM
BOTTOM SLUG ADJUST
TOP SWG ADJUST
4MC BOTTOM SLUG
AMPLITUDE
SWG ADJUST AT TOP
SLUG ADJUST AT ADJUST AT 10 MC
10 MC
.6MC BOTTOM SLUG
\.\... -J/ '\ ADJUST AT 1.65MC
R F ADJUSTMENTS
HF OSc. ADJUSTMENTS
figure 7. )'op View of Chassis
I
10
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IF ALIGNMENT
NOTE
Use a non- metallic alignment tool such as Gen-
eral Cement Co. No. 5097, or equal.
a. Connect the output cable of a 455 KCS unmodu-
lated. signal generator to the bus lead of the
6BE6 mixer gnd. The frequency accuracy
of the generator may be checked with sufficient
precision by picking up its second harmonic
(910 KCS) in any receiver whose calibration at
910 KCS has been checked as correct and then
adjusting the generator frequency.
b. Connect aDC vacuum tube voltmeter, set for neg-
ati ve voltage reading to pin S of the V7, 6BVS
socket.
c. Set the receiver controls as follows:
BAND SPREAD dial on 100
Function switch on REC.
Main tuning dial on . 54 MC
Noise limiter switch on OFF
AUDIO GAIN control at minimum
SELECTIVITY control on OFF
Band selector switch on . 54 -1. 6 MC
MAN. -AVe switch on MAN.
SENSITIVITY
control on 3 from maximum.
d. During alignment, adjust the generator output
and the SENSITIVITY control to prevent over-
loading. Final adjustment should be made with
the SENSITIVITY control at approximately the
third indice from its maximum (clockwise) posi-
tion. Adjust each of the three IF transformers
fo,(' maximum meter reading. Topside adjust-
ments (Figure 7) are secondaries or grid cir-
figure B. Bottom View of Chassis
11
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@--------------
cuits; bottom of chassis adjustments (Figure 8)
are primaries or plate circuits.
e. Turn the Q-MULTI. ON and adjust the SELEC-
TIVITY control clockwise to a position below
the oscillating point. With its panel bushing nut
loosened to permit the frequency shaft to turn
without hindrance by the stop, adjust the FREQ.
control to obtain a maximum meter indication.
The input signal must be adjusted to a value just
sufficient to obtain a good meter swing. This
adjustment is the center frequency of the pass
band. While the meter is at maximum, turn
the stop lug to a position 180 degrees directly
opposite the stop pin in the frequency shaft.
Holding it in this position, tighten the bushing
in the nut making sure that the shaft or the stop
lug have not turned by checking the zero setting.
f. Turn FUNCTION switch to BFO. With the BFO
frequency control on ZERO adjust the slug in
L7 for ZERO beat with the AVC-MAN switch
on MAN position and the SENSITIVITY control
adjusted at a position below overload.
g. With the MAN. -AVCswitchon AVC, the SENSI-
TIVITY
control at maximum, with grid pin 1 of
the V5 amplifier tube grounded, and with no
signal input, adjust the METER ZERO ADJUST.
pot at the rear of the chassis (Figure 4) for a
reading of zero on the "8" meter.
RF ALIGNMENT
NOTE
Use a non-metallic alignment tool such as Gen-
eral Cement Co. No. 8282, or equal.
a. The slugs and trimmers, having been factory
adjusted, should require a minimum amount
of adjustment for any realignment.
b. All RF and oscillator slug adjustments are made
from the top of the shield cans. See Figure 7.
c.
Connect the unmodulated, signal generator out-
put cable to the antenna and ground terminals
of the receiver, with the A terminal adjacent to
the G terminal jumped together. See Figure 4.
d. Set the controls the same as for IF alignment
above. Adjust the SENSITIVITY control as re-
quired to obtain a sufficient voltmeter read-
ing and to prevent overloading.
e. The oscillator adjustment is made first. The
RF is adjusted next to obtain maximum ampli-
tude. The antenna slugs are adjusted last. A
certain amount of interaction will occur between
the oscillator and RF adjustments, partiCUlarly
on the higher frequency bands. Final adjust-
ment should be accomplished by combined or
alternate adjustment of the oscillator and RF for
maximum amplitude.
NOTE
The trimmer adjustments, if required, should
be the final adjustment for each band. See Fig-
ure 8 for location of trimmers.
There is no RF amplifier adjustment for the
.54 -1. 6 MC band.
f. Note that the oscillator frequency in the HQ-100
is always on the high side of the signal frequency
by 455 MCS. Therefore, it is necessary to
make sure that the oscillator frequency is not
adjusted below the signal frequency which would
be
an image response of the signal.
g. It will be necessary to repeat low and high end
alignment adjustments of each band since the
adjustments are interdependent. The process
should be repeated until maximum amplitude is
obtained at both alignment frequencies of each
band.
NOTE
The receiver should be warmed up at least
one-half hour before final oscillator frequency
adjustments are made for the dial calibration
check.
DIAL CAI.IBRATION
a. Use a crystal calibrator haVing 100 KCS and
1000 KCS output. Set the arbitrary band spread
dial scale to 100. Set the function switch to
BFO. Set the BFO FREQ. control to zero. Set
the SELECTIVITY control toOFF. Set the MAN.
-AVC
switch to MAN.
b. Check to see that the frequencies at or near the
alignment frequencies are "on the line." If not,
make minor adjustments of the slugs and trim-
mers (Figures 7 and 8) to make them correct.
CAUTION
Weaker signals will be observed at dial settings
apprOXimately 10 KC8 above each calibration
dial marking. These are image signals from
1 MC above the desired signal and may be re-
cognized by their somewhat weaker strength
and may be further reduced by proper adjust-
ment of the gain controls. They will, of
course, be more noticeable on the higher
bands. Keeping the antenna tuned will help.
12
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CI)
Cl
o
eX)
co
o
o
~
co
o
o
N
20 30
--.
, II
, , --, ,
• . • I
1\ , \ j
I{
\ , I I
\ \
IT
117
\ \ \ II I
A-++\
, \
..
C I
1/
\ I
, I ,
,
--.
--, --,
,
--,
"
I!t
i
II
I~
\ \ I II I
\' \
I!
1'7
,
\
1\ \ I j 7
I
,
1\ \ T
" ,
-,
TT
\ \ ,
.1
~\
\ , /I
\'
\ ,
,,'/
\ I
\ ,,
~
,,
1\ I ,
l=
HO-IOO Selectivity
,
l-
• I'
I-
A -Regular if
" I II
I-
6.0 KC at 6 DB
,\ .I j
I-
1\\ ~
I 1
~
B- -0 Mult. Max.width
2.9 KCat6DB
h:
,,
r-
c----Q Mutt. Adj'd for
\\ ,I
I,
-
.3 KC 016 DB
~I
V
30
20
10 0 + 10
K C
off Resonance
Figure 9. Se'ectivity Curves
13
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I
II
II
I
I
[I
:i;:
TABLE 1. TUBE SOCKET VOLTAGES
MEASURED
FROM TUBE SOCKET PINS TO CHASSIS WITH VTVM AUDIO GAIN MINIMUM. BAND SWITCH ON 10 TO 30 Me.
LIMITER OFF. AVC-MAN SWITCH ON MAN. SENSITIVITY MAX. OPERATION SWITCH ON REC. Q-MULTIPLIER OFF.
LINE VOLTAGE 117. NO SIGNAL INPUT.
TUBE
SOCKET PIN NUMBERS
SOCKET NO. 123 4 5 6 78 9
V1RF
6BZ6
V2 MIXER
6BE6
V3 HFO
6C4
V4 12AX7
Q
MULT. 1st A-F
V5 1st IF
6BA6
V6 2nd IF
6BA6
V7 6BV8 DET
LIM AVC BFO
VB 6AQ5
AUDIO
OUTPUT
V9 OA2 V-R
1.8
6.3 AC
210
105
-6
1.3
6.3 AC 205 70
90
6.3 AC 90 -3 TO -9
90
1.5
60
6.3 AC
200
100
-8 BFO ON 110 BFO ON
6.3 AC
6.3 AC
200
1.2 AC
95
-.2
-9 BFO ON
105
13
6.3 AC
105
210
205
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TABLE 2. TUBE SOCKET RESISTANCES
BAND SWITCH ON 10-30 MC.
MEASURED FROM TUBE SOCKET PINS TO CHASSIS. AUDIO GAIN MAXIMUM.
OPERATIONS SWITCH ON REC. BFO OFF.
LIMITER ON. SENSITIVITY MAXIMUM. AVC-MAN ON MAN.
TUBE
SOCKET PIN NUMBERS
SOCKET NO.
-1 2 3 4 5 6 7 8 9
VI RF
10K
6BZ6
2.4M ON AVC 180 0 0
.5 MEG
.5 MEG
0
V2
MIXER
6BE6
22K 180 0 0 .5 MEG
.5 MEG
0
V3 HFO
6C4
.5 MEG INF
0 0
.5 MEG
47K
0
V412AX7
6800
Q MULT. 1st AF
.5 MEG
2.2 MEG
16KSEL OFF
0 0
.5 MEG
1 MEG
2200 0
V5
1st IF
0
180
6BA6
2.4M ON AVC 0 0 0
.5 MEG
.5 MEG
10K MIN SENS -
V6 2nd IF 200
6BA6
470K 0 0 0
.5 MEG
.5 MEG
10K MIN SENS -
V7 6BV8 DET
LIM AVC BFO
0
lOOK .5 MEG
0
3.3
120 K 0
2.2 MEG
190 K
BFa ON
lOOK LIM OFF
V86AQ5
AUDIO OUTPUT
.5 MEG
430
0 0
.5 MEG
.5 MEG
.5 MEG
V9 OA2 V-R
.5 MEG
0 INF
0
.5 MEG
INF
0
.....
CJ1
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m
Sche=atic
Designation
C1, A thru C
C2, A thru F
C3
C4, 5, 6, 7,8,9,10,
15,19,30,31,32,
34,35,36,41,48
Cll, 12, 13
C16, 17, 18
C20,21,22,23
C24
C25
C26,57
C27
C28
C29
C33, 45, 46
C38
C38A
C38B
C38C
C42
C43,44
C47
C49,50
C51
C52
C53
C54
C55
C56
C58
C59
C60
Ll
L2
L3
L4
L5
L6
L7
Rl,32
R2
R3
R4, 10
R5
R6,33
R8
R9,34
PARTS LIST
Description
CAPACITORS
Variable, Main tuning ..•••.....•......•..•.•.....•.•.....•..•....•...
Variable, Bandspread ..........•....•..............•.............••.•
Variable, Antenna Co=pensator ...•..•.•....•.......•.................
Fixed, Ceramic disc. 01 mf 1000V .
Trimmer 1-8 mmf 500V ..........•.••.....•.•.......•.. " ......•..•..
Fixed, silver mica, 100 mmf 500V ...•.....•.••......•....•..•....•.•.
Variable 1-8 mmf 500V ...•...••...•...••....•••.•.•...•... ' .••......•.
Fixed, silver mica 430 mmf 300V ...••......•.....•......•.••.•.•••...
Fixed, silver mica, 1300 mmf 500V .....•...............•......•......
Fixed, silver mica, 3000 mrnf 500V .....•...•••......•.......••...•...
Fixed, silver mica, 1100 mrnf 500V ..•....•.•...........•..•••...•••..
Fixed, silver mica, 3300 =mf 500V ..•....••.....••......•••........•.
Fixed, silver =ica, 510 =mf 500V ..•..................••......•••...
Fixed, Ceramic disc, .04 mf 600V .•...•••..•....•....•.......••....•
Fixed, Three-section electrolytic ....••.•••••.•.....•.......•...••••..
60 rnf 450V (Part of 1517-01-00001)
40 rnf 450V (Part of 1517-01-00001)
25 mf 50 V (Part of 1517-01-00001)
Fixed, Ceramic disc, .005 mf 1000V ....•......•......•..•.....•.•..•..
Fixed, Ceramic disc, . 01 rnf 1400 V .........•••......•.....•.•..•.•...
Fixed, Discap, temperature compensating, 6.8 mmf ............••..•....
Fixed, Discap, temperature compensating, 2.7 =mf .......•.....•....••
Fixed, Discap, te=perature compensating, 6.8 mmf ..•..............•.•
Fixed, Ceramic, temperature compensating ..••. '" ... '" ....•.•.•••...
non-insulated, 1, 5 mmf
Fixed, Silver mica 5 mmf 10% 500V ....•.....•......•.............•...
Fixed, Ceramic disc, 4.7 mmf 5% N220 ..•.... ,. .•....•.............•...
Fixed, Ceramic disc, .02 MFD 500V ..•.•......•................••.••.
Fixed, Silver mica 350 mmf, 20% 100V ....•...••..........•............
Fixed, Silver mica 220 mmf 5% 500V ....•....••.......................•
Variable ....•...... '" .••............•....•........... " •.....•.....
Fixed, Silver mica 2mrnf ±. 5 mmf, 500V ......•..•...••..••..•.••.•...
COILS
R. F. Coil Assembly (Bands 1 and 2) ........•..•.•...... , ...••......••.
R. F. Coil Assembly (Bands 3 and 4) .....•.....••.... , .•.•........••....
H. F Osc. Coil Assembly (Bands 1 and 2) ...••••.......•....••.•....•.••
H. F. Osc. Coil Assembly (Bands 3 and 4) ..•.•.••....••....•.•.•.••....
Coil and Ferrule Assembly ..•......••...••.....•.............•.•.•••.
Choke, Filter, 13 Henries at 65 ma D. C ......••.•.•...•...•....•••....
BFO Coil .•...••.•.•......•...••.•.•..•..•.•.•..••........•••.••••••
RESISTORS
22 Ohms, 1 /2W .....•.•...........••.•.••..•......•.•......•.•.......
Potentiometer, 10,000 Ohms .......•.........••.•..•....•..••...•.....
10,000 Ohms, 1/2W ...•...•....•.•...•.•..••...•.••.........•....•..•
1,000 Ohms, 1/2W .••.........•.....••..••....••.•...•.....•...•.....
22,000 Ohms, 1/2W .•....•..........•.....•...........•.........•..••
180 Ohms, 1/2W .•...............•......•...•.........•.....•.....•..
6,200 Ohms, 1 /2W .•..•.•.........•....•..•.•..•..•....•...•.•..•....
47,000 Ohms, 1/2W .................•..•••....•.........•.•••••..•.•.
Hammarlund
Part No.
9441-60-40003
9441-60-40004
9434-45-40038
1509-01-01001
1527-01-00001
1519-01-00001
1527-01-00002
1519-02-03010
1519-02-03011
1519-02-03009
1519-01-03001
1519-02-05001
1519-01-03002
1509-01-01005
1517-01-00001
1509-01-01003
1509-01-01015
1509-01-00022
1509-01-00001
1509-02-00003
1509-01-02002
1519-01-00003
1509-02-00024
1509-01-01016
1519-02-00053
1519-01-00007
9434-45-40038
1519-01-00024
1809-01-00005
1811-01-00011
1809-01-00006
1811-01-00012
9001-03-00118
5626-02-00001
1804-02-00055
4703-01-00312
4735-02-00001
4703-01-00344
4703-01-00332
4703-01-00348
4703-01-00323
4703-02-00466
4703-01-00352
16
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------------------@
Schematic
Designation
R11
R12
R13
R14, 16, 21, 29, 35
R15
R17
R19
R20
R27
R28
R30
R31
R36
R37
R38
R39
R40
SlA, SIB
SIC
S2
S3
S4
S5
Tl
T2
T3
T4
T5, 6, 7
T8
T9
CRl,2
Fl
Fl
II,2
Jl
Ml
P2
P2
PARTS LIST
Description
RESISTORS (continued)
2.2 Megohms, 1/2W .
6,8000hms,l/2W .....•................•..........................
Potentiometer, 10,000 Ohms .................•.......................
2,200 Ohms, 1 /2W" " .
Potentiometer, 200 Ohms .....................•.....................
1,600 Ohms, 1/2W 5% .••.....................•......................
180 Ohms, 1/2W 5% .•...................•.................•.........
4,000 Ohms, lOW .
Potentiometer, 1 Meg •..............................................
47 Ohms, 1/2W ..........................•......................... '.
100 Ohms, 1/2W ............•...•....................................
430 Ohms, 1W ..........•...........................................
10 Ohms, 1/2W .....••...........................................•...
470K Ohms 1/2W ...•...............••.••.•....•.......•....•........
lOOK Ohms, 1/2W ..........••.•••••..........•.................•...•
3.3 Ohms, 5W ........••....•.•......................................
22 Ohms, 1W .....•.••.•.••...........................•.....•........
SWITCHES
Switch Wafer RF .......•..................................•.•.•••...
Switch Wafer HF Osc .............•..•••....••.••......•.•...........
Power-On-Off, SPST (Part of R13)
OFF-REC BFO, Single Section, four position ...•.•.....•••.•.••....•...
MAN. -AVC, SPST ...••••.••••..•......••.•..••••..•.•••••••••••.•....
LIMITER, SPST ........•.•..•.............................••.•......
TRANSFORMERS AND COIL ASSEMBLIES
Antenna Transformer Assembly (Band 1) .•..••••••..•.••.......•.•.....
Antenna Transformer Assembly (Band 2) ..............................•
Antenna Transformer Assembly (Band 3) ......•........................
Antenna Coil Assembly (Band 4) ..•••...•..............................
Transformer, 1st, 2nd, and 3rd 1. F. .. .
Transformer, Output, Max power 5W, impedance .
match; 10,000 Ohms plate to 4 Ohms voice coil.
Transformer, Power, Primary 115V /230V ....................•.•.••.•.
50-60 cps.
MISCELLANEOUS
Diode, Silicon CER72C .•........•••..........•..........•............
Fuse, 1 amp (115V Operation) ......••................•••.•.•..........
Fuse, 1/2 amp (230V operation) ..•••••.••.........•..•..•••.•••.•.....
Lamp, pilot #47, 6.3V, . 15A .•......••.••......•..........••••••.....
Phone Jack ..............•.•........•.•....................•..••.•..
Meter "s" (Carrier Level) ...•..•••..••......••.•••...........•..•.•••
Adapter (115V) .•....•.•••••....•...••••......•.....•..•..••••......•
Adapter (230V) .......••••••..•..••••.•....•..•.•.....••••.........••
Telechron Clock Assembly (115V/60 cps) .••.•••..•..........•.•••••...•
Telechron Clock Assembly (230V /60 cps) .•.................••.•••••.•..
Telechron Clock Assembly (230V /50 cps) " .•.•...............•
Crystal Calibrator XC-I00 ...•••••......•.••••.•.•...........••.••.•..
Hammarlund
Part No.
4703-01-00372
4703-01-00342
4735-01-08002
4703-01-00336
4735-01-00200
4703-02-00452
4703-02-00429
4714-01-01002
4735-01-00002
4703-01-00316
4703-01-00320
4704-02-00738
4703-01-00308
4703-01-00364
4703-01-00356
4713-01-00001
4704-01-00612
5105-01-00007
5106-02-00005
5106-02-00007
5101-01-00001
5101-01-00001
1809-01-00004
1810-01-00010
1811-01-00010
1812-01-00012
1811-01-00018
5618-01-00002
5603-01-00011
4807-01-00001
5134-01-00201
5134-01-00213
3901-01-00001
2109-01-00001
2902-01-00003
9001-03-00028
9001-03-00029
9207-01-00001
9207-01-00002
9207-01-00003
9205 -00-000 11
17
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