Lafayette HE-30 User manual

LAFAYETTE
HE-30
COMMUNICATIONS
RECEIVER
=
g
TA

TECHNICAL SPECIFICATIONS
FREQUENCY RANGES..........-20008 BAND A _ 550-1600 Kes
BAND B_1.6-4.8 Mcs
BAND CC 4,8- 14.5 Mcs
BAND D_ 10.3-30 Mcs
BANDSPREAD ........... 00000. +... Calibrated Electrical Bandspread
80 and 40 meters, 5 Kes per division
20 and 15 meters, 20 Kes per division
10 meters, 50 Kes per division
ANTENNA INPUT ............. o Siaxeievere 50 - 400 ohms impedance
AUDIO POWER OUTPUT ............. 1.5 watts
SENSITIVITY. pe MR aR Oa Lie ae eee ee l pv for 10db S/N Ratio
SELECTIVITY ices, cis disiatetvae ten 8 av ealncs . £10 Ke at -60db (+2 Ke at -6db) without Q-Multiplier
*0,.8Kes at -6db with Q-Multiplier
SPEAKER OUTPUT............ stems 4 or 8 ohms
HEADPHONE OUTPUT............. ... Low Impedance
POWER CONSUMPTION .............. 50 watts at 117 volts AC, 60 cps
TUBE COMPLEMENT ................ Vl - 6BA6 RF Amplifier
V2 - 6BE6 Mixer
V3 - 6BE6 HF Oscillator
V4 - 6AV6 Q-Multiplier-BFO
V5 - 6BA6 lst IF Amplifier
V6 - 6BA6 2nd IF Amplifier
V7 - 6AV6 Detector, Ist AF Amplifier, ANL, AVC
V8 - 6AQ5 Audio Output
V9 - 5Y3 Rectifier
DIMENSIONS ....... 0... cc cee eee eens 7™ Hx 15" Wx 10" D
WEIGHT access eis. 0b wees 6 oe ee eieree ee ee 21 lbs
aby:
mote
Ceadhh 1 saat
ENTIRE CONTENTS COPYRIGHT 1961 BY LAFAYETTE RADIO ELECTRONICS CORP.
165-08 LIBERTY AVE., JAMAICA 33, N. Y.
Printed in USA 1M-216 6/61 1.25M/K
Qe PU Fr RTD I> ste viet

UNPACKING INSTRUCTIONS
After unpacking the receiver, carefully check for possible damage which may have occurred in transit.
Should any signs of damage be apparent (tubes broken, case dented, etc.), notify the store from which
it was purchased. If the unit was shipped to you, also file a claim with the carrier,
The following accessories should be included in the carton:
1 Standard Phone Plug
1 Jumper Plug (for the auxiliary control socket)
INSTALLATION
POWER SOURCE
The receiver is designed to operate from a 90-125 volt, 50-60 cycle AC power source, DO NOT OPER-
ATE FROM A DC SOURCE, The receiver is equipped with a voltage selector switch (located within
the unit), This switch should normally be left in the 117V position.
SPEAKER CONNECTION
A three-terminal strip marked OUTPUT is provided at the rear of the receiver for speaker connections.
Any PM speaker with either 4 or 8 ohm impedance can be used, Simply connect one lead to the ground
terminal "0" and the other lead to the terminal that corresponds to the speaker impedance, ‘The output
power of the receiver is sufficient to drive a 4-12 inch PM speaker adequately.
HEADPHONES
A standard phone jack is provided on the front panel of the receiver for headphone reception, Low im-
pedance (8-16 ohms) headphones are recommended for optimum results. Insertion of a phone plug into
the jack automatically disconnects any speaker attached to the 8 ohm output terminal, ; .
ANTENNAS
The terminals marked "Al", "A2", and "E" at the rear of the receiver are for antenna and ground con-
nections, Either of the following two types of connections can be used to obtain satisfactory results,
INVERTED L ANTENNA
The inverted L type of antenna will provide satisfactory performance over the entire tuning range.
Simply short Ae and E with a jumper wire, and connect one end of the antenna wire to Al, For good
reception, the antenna wire should be placed as high as possible and 50-100 feet long (see Fig. 1). In
some instances, a wire connected from terminal ''E'' to a water pipe may improve reception,
DOUBLET ANTENNA
A doublet antenna will give excellent results, especially on amateur bands. A 75 ohms balanced trans- . :
mission line should be used (as shown in Fig.2). Since the doublet antenna provides optimum perform- i 4
ance only at a given frequency, it should be cut to the length for the most often used band of frequencies.
The overall length of a doublet antenna can be determined by using the following formula: j
‘i
}
468
Frequency in megacycles
L (Length in feet) =

468
L(Feet]= =e GueNcy (Me)
300 OHM
TWIN. WIRE
Al A2 E
©) Ce TO GROUND. © (3) - (To GROUND
(OPTIONAL) cae (OPTIONAL)
%
st
ae
FIGURE 1. FIGURE 2 4
Single Wire Antenna {inverted LU) Doublet Antenna 3
Since the doublet antenna displays directional properties broadside to its length, it should be oriented “al
in such a manner that maximum signal pickup can be realized, oe
“nd
When using either a balanced transmission line or a twisted pair, the leads connect to terminals "Al" ee
S and ''A2" respectively, and the jumper wire between "A2" and "E" is removed. A height of 30-50 feet r
e is” recommended for good reception of weak signals, — t
"| FUSE
. A 2 amp fuse is located at the rear of the receiver. To remove it, unscrew the spring loaded cap. Re-
place only with one of a similar rating.
AUXILIARY CONTROL
‘ A socket in the back of the’ receiver allows simultaneous control of this receiver with a transmitter. An
external switching device can be constructed so that the receiver will be inoperative during periods of
mee transmission, In this case, the FUNCTION switch is
AUXILIARY SOCKET placed in the SEND position. The external switch is
attached to the 5-pin plug so that pins 3 and 2 (see
Fig. 3) will be connected when signal reception:is de-
G TO EXTERNAL . sired. This. plug is then inserted into the socket in
SWITCH place of the jurnper plug. In this manner, signal re-
ception will be instantaneous, as plate voltage will be.‘
applied to the RF stages wher the switch is closed ac-
Concetehy:
‘howe t
pe
Lisi Zh hehe ass
FIGURE 3 For normal operating conditions with no external - >>
- switching, the jumper plug provided must be inserted
if Auxiliary Control Socket into the socket, Pins 3 and 2 of the plug are shorted, :. ~
x thus providing plate voltage to the RF stages, To disable the receiver under these conditions, set the ~”:
, "4 FUNCTION switch to the SEND position, In this position plate voltages to the RF stages are cut off,
a= Returning the switch.to REC AM will provide instantaneous signal reception, :
et e

INITIAL CONTROL SETTINGS
CW SETTINGS SSB SETTINGS
CONTROL
AM
SETTINGS
FUNCTION
REC
AM
Q-MULT
Q-MULT
BAND
SEL.
Set
for
desired
range
Set
for
desired
range
Set
for
desired
range
SELECTIVITY
|
CW-SSB*
CW-SSB
CW-SSB
BFO-Q-MULT
;
FREQUENCY | Mid-position Mid-position . Mid-position
IF GAIN Maximum Adjust for desired ~ Adjust for desired
audio level audio level
ANT TRIM 12 o'clock position 12 o'clock position 12 o'clock position .
MVC-AVC AVC MVC MVC
ANL OFF-ON| Optional Optional OFF
BANDSPREAD|
Set
to
100
on
Logging
Scale
|
Set
to
100
on
Logging
Scale}
Set
to
100
on
Logging
Scale
AF
GAIN
.
Adjust
for
desired
2/3
to
3/4
clockwise
2/3
to
3/4
clockwise
audio level
* Setting the SELECTIVITY control to CW-SSB with the FUNCTION switch
in REC AM disconnects the Q-Multiplier from the IF, allowing normal IF
band pass,
THE Q-MULTIPLIER CIRCUIT »
ne coe
A
Q-Multiplier
provides
the
additional
selectivity
often
required
for
optimum
reception
of
signals
in
the
congested
short-wave
bands,
In
your
receiver,
the
Q-Multiplier
circuit
serves
a
dual
function
-—
Q-Multiplier
and
BFO.
For
CW
and
SSB
reception,
the
circuit
is
employed
as
a
BFO,
The
circuit
may
be
employed
as
a
Q-Multiplier
during
phone
reception
if
conditions
require
the
use
of
additional
selectivity,
A
little
experience
in
using
the
Q-Multiplier
will
be
necessary
for
optimum
results
under
different
re-
ceiving
conditions.
In
the
hands
of
an
experienced
operator,
the
Q-Multiplier
is
a
very
handy
tool,
and
will
greatly
enhance
the
performance
of
the
receiver,
pe
OK
‘
en
A, as v Toe te
The
controls
associated
with
the
Q-Multiplier
circuit
are
the
SELECTIVITY
and
BFO-Q-MULT
FRE-
QUENCY
controls,
They
are
not
operative
unless
the
Function
switch
is
in
the
Q-MULT
position.
ae fm
"5 a
tom
:
|
SELECTIVITY CONTROL gn
an ok re
When
the
SELECTIVITY
control
is
in
the
CW-SSB
position,
the
circuit
oscillates,
thus
providing
the
|
7
Aa
oS
A
beat
signal
necessary
for
CWyor
SSB
reception.
Off
the
CW-SSB
position,
the
circuit
is
connected
to
+a
the
IF
stage
and
now
acts
as
a
narrow
gate
through
which
the
IF
signals
must
pass.
The
width
of
the
:|
"gate''
is
determined
by
the
position
of
the
SELECTIVITY
control,
Advancing
the
control
from
the
‘
fully
counter-clockwise
position
serves
to
peak
the
signal
increasingly
until
a
point
of
oscillation
is
reached,
Sharpest
selectivity
is
reached
just
prior
to
oscillation,
Spe
BFO-Q-MULT FREQUENCY CONTROL
The
action
of
this
control
is
determined
by
the
position
of
the
‘SELECTIVITY
control,
When
the
Se-
lectivity
control
is
set
to
CW-SSB,
the
BFO-Q-MULT
FREQUENCY
control
is
used
to
vary
pitch
for
CW
reception
or
to
provide
‘clarity
of
signal
for
SSB
reception.
ee
ee
ere
-
When
the
Selectivity
control
is
used
to
increase
selectivity
during
Q-Multiplier
operation,
(as
described
previously),
the
sharp
peak
produced
can
be
moved
around
within
the
IF
pass
band
by
means
of
the
BFO-Q-MULT
-FREQUENCYSCONTROL
to
reduce
or
eliminate
interference
from
adjacent
signals.

USING THE CIRCUIT AS A Q-MULTIPLIER
Initially, all controls on the receiver should be set to the positions indicated in the chart for AM set-
tings. Tune in desired station. Set SELECTIVITY to the fully counter-clockwise position and FUNC-
TION to 'Q-Mult'', Increase AF gain if necessary. Advance the SELECTIVITY control until the de-
sired degree of selectivity is obtained. The point of maximum selectivity is reached just before the
circuit breaks into oscillation. The BFO-Q-MULT FREQUENCY control may now be adjusted to pro-
vide a reduction, or to eliminate, any adjacent channel interference.
USING THE CIRCUIT AS A BFO
Initially, all controls should be set as indicated in the chart for CW or SSB operation, Under these
conditions the BFO-Q-MULT FREQUENCY control is used to vary the pitch (CW) or for clarity of
signal (SSB), The SELECTIVITY control remains permanently in the CW-SSB position for CW or
SSB reception,
TUNING
The main tuning and bandspread dials are calibrated in megacycles and contain special markings to
simplify tuning. The major amateur radio bands are contained in the 1.6 to 4,8, 4.8 to 14.5 and
10.3 to 30,00 megacycle bands, The location of each amateur band is indicated by heavy white scale
lines on the main tuning dial. The circled letter or letters which appear with each band indicate the
bandspread scale to be used, Calibration of the main tuning scales is correct when the bandspread
pointer is set at 100 on the LOGGING SCALE.
Bandspreading on the amateur bands is carried out in the following manner: Set the bandspread pointer
initially to 100 and the main tuning pointer directly over the circled letter for the band to be tuned. In
some cases the band is split between two such letters, For example, B] and B2 together cover the
range of 7,0 to 7,35 megacycles — Bl from 7.0 to 7.17, B2 from 7.17 to 7.35 megacycles, The cali-
brated bandspread scale which is used is indicated to the right and left-hand side. Thus, if the main
tuning pointer is set over Bl, the bandspread scale in use is the one marked Bl, the fourth one down,
Tuning is then accomplished solely with the BANDSPREAD control.
Short-wave bandspreading, for other than amateur bands, is accomplished by setting the bandspread
pointer at 100 on the Logging Scale and the main tuning pointer at the high end of the short-wave band
to be tuned, Rotate the bandspread control to tune over the band. Moving the bandspread pointer to-
wards O on the logging scale subtracts from the frequency indicated on the main tuning scale. Logging
of short-wave stations is possible by noting the readings on both the Main Tuning and Logging Scales,
S- METER READINGS
The S-Meter provides a means of measuring the relative strength of incoming AM signals, Relative
readings are only correct when the IF GAIN control is fully clockwise, Measurements are read in
S units from | to 9 and in decibels above S9 from 0 to 40db, The circuit is disabled when the MVC/
AVC switch is in the MVC position.
A ZERO ADJ control at the rear of the receiver is provided for zeroing the S-Meter electrically. This
adjustment is made with the antenna disconnected, IF GAIN control at maximum and AVC on,
ANTENNA TRIMMER
The ANT TRIM control, adjustable from the front panel, acts as a compensating capacitor to permit
optimum matching of the receiver to the antenna at all frequencies, Initially, the control should be set
to its mid-position (the dot on the front surface of the knob at 12 o'clock position). The control should
always be adjusted for maximum background noise. Each setting will be good only over a limited range
of frequencies, The trimmer should therefore always be readjusted after tuning to the general area
where the expected signal is to be found,
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S- METER
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LAPAVISTTE
Moet
Acts
As
A
Tuning
Indicator
-
Shows
Relative
Signal
Strength
FUNCTION
Selects
Mode
of
Operation
REC.AM
SEND
OFF,
$
°
(aMuLT
ee
p>
7
;
“7
WH
we
1 wy
FUNCTION
AF
GAIN
SELEoTWITY
avert
at
BAND
CEL
AE GAIN eee
Adjusts
Audio
Output
Level
SELECTIVITY
BAND
SEL
IF
GAIN
See
section
head-
“Selects
Tuning
Adjusts
IF
Gain
—
ed
The
Q-Multi-
Range
Uged
As
Volume
plier
Circuit
Cqntrol
For
CW
Qperation
BFO
-
Q-MULT
rt.
FREQUENCY
ic
i
LOCATION
AND
FUNCTION
OF
CONTROLS
te
MAN
TUNING
BAND
SPREAD
ANT
TRIM
Adjusts
Recciver
For
Best
Antenna
Match
Over
En-
tire
Frequency
Range
4
MAIN
TUNING
Tunes
Frequen-
cy
Range
Of
Re-
ceiver
As
De-
termined
By
Band
Selector
Setting
BANDSPREAD
Permits
Ex-
panded
Tuning
Of
Small
Portions
Of
The
Main
Tuning
Dial
ANL
OFF-ON
Used
To
Reduce
Excessive
Noise
From
Auto
Igni-
tion,
etc,
MVC-
AVC
AVC
Position
Used
to
Minimize
Fading
Of
Signals
aS

AM OPERATION
For
the
reception
of
broadcast
stations,
short-wave
listening,
etc.,
place
all
controls
in
the
positions
indicated
in
the
Initial
Control
Settings
chart,
Tune
in
station,
using
Main
and
Bandspread
tuning
con-
trols
as
indicated
in
the
section
under
"TUNING".
Adjust
ANT
TRIM
for highest
''S''
meter
reading
on signal, This antenna’ control setting is satisfactory while operating over a limited frequency range.
If excessive spurious noises such as those caused by auto ignition make reception difficult, place the
ANL OFF switch to the ON position. The automatic noise limiter should be used only when necessary,
since it tends to reduce the overall efficiency of the receiver.
If interference from nearby stations makes reception difficult, the Q-Multiplier may be employed to
minimize or eliminate the interference, Since the use of the Q-Multiplier results in a narrower band-
width it should only be employed when interference is severe and where maximum fidelity is not re-
quired,
CW OPERATION .
The control settings required for the reception of code signals are indicated in the chart. AVC is
switched off and the IF GAIN control is used as a volume control. Tune signal to zero beat. The
BFO-Q-MULT FREQUENCY control should then be adjusted on either side of white dot for desired
pitch,
SINGLE SIDE BAND OPERATION
The settings of controls for SSB reception is essentially the same as for CW (see chart), The BFO
frequency however, is used in this case for carrier reinsertion. AVC is switched off and the IF GAIN
control used to adjust the level. Tune station in with BANDSPREAD control and then adjust BFO-Q-
MULT
FREQUENCY
control
for
clarity
of
speech.
Slight
readjustment
of
the
BANDSPREAD
may
be
necessary to provide best audio quality.
SHORT-WAVE LISTENING
On
the
short-wave
frequencies
are
to
be
found
radio
stations
transmitting
from
all
over
the
world,
Many
of
these
stations
provide
English-language
broadcasts.
The
frequencies
on
which
the
majority
of
short-
wave
broadcast
stations
operate
are
found
in
the
two
upper
bands
of
your
receiver
(4.8
to
14.5
mega-
cycles
and
10,5
to
30
megacycles),
A
characteristic
of
short-wave
is
that
reception
varies
with
the
time
of
day,
the
season
of
the
year
and
with
weather
conditions,
In
order
to
know
just
when
and
where
to
listen,
a
listening
chart
which
lists
English
language
broadcast
stations
best
heard
in
North
America
is
included
in
this
manual.
"Better
Shortwave
Reception"
by
William
1.
Orr
(available
from
Lafayette
Radio
as
BK1032)
is
recommended
to
the
short-wave
listener
and
amateur
alike,
It
provides
an
intro-
duction
to
short-wave
radio
for
the
beginner
and
presents
some
of
the
practical
aspects
and
helpful
ad-
vice for the more experienced listener.

Listen
to
the
Voices
of
the
World
ENGLISH
LANGUAGE
SHORT-WAVE
BROADCAST
STATIONS
BEST
HEARD
IN
WESTERN
NORTH
AMERICA
Readers
in
the
western
part
of
the
United
States
and
Canada
will
find
the
following
list
of
‘‘Best
Heard’'
stations
helpful
in
tuning
the
short-wave
broadcast
bands.
The
left-hand
column
lists
the
hour
in
Pacific
Standard
Time
for
broadcasts
in
English
only;
in
the
middle
column,
the
city
and
country
from
which
the
broadcasts
originate
are
listed
with
the
name
the
station
uses
for
identification
in
parentheses;
and
on
the
right
are
the
frequencies
and
call
letters
for
stations
using
them
during
their
broadcasts.
TIME
(PST)
CITY,
COUNTRY
(NAME)
FREQUENCIES
(he.}
Manila,
Philippines
(The
Call
of
the
Orient)
11855,
9790
Djakarta,
Indonesia
(The
Voice
of
Indonesia)
9710,
4910
elbourne,
Australia
(Radio
Australia)
11770
(VLC)
Stockholm,
Sweden
(Radio
Sweden)
15155
London,
England
(North
American
Service)
17700
London, England (General Overseas Service) 17700, 15310
London,
England
(General
Overseas
Service)
15310.
11930
Tokyo,
Japan
(Radio
Japan)
17825
(JOA22),
16235
(JOB9)
London,
England
(General
Overseas
Service)
11930,
9825
-4
.
Moscow,
USSR
(Radio
Moscow)
17865,
15140
4:30.
4:50
p.m,
Tokyo,
Japan
(Radio
Japan)
16235
(JO9),
4:55-
5:45
p.m,
Montreal,
Canada
(Radio
Canada)
eae
233
85588
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ow
$ 82888258
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83
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vo vpovurs:
33 33333
5:00-
7:30
p.m.
Cape
Heitien,
Haiti
(The
Evangelistic
Voice)
—
no
broad-
caste
on
Wednesday
and
Thursda
15400,
9656
5:30.
7:18
p.m.
Berne,
Switzerland
(Switzerland
Calling)
11865
(HERS).
9535
(HER4),
6165
(HER3
4:00.
9:00
p.m.
Quito,
Ecuador
(HCJB
—
The
Voice
of
the
Andes)
—
no
188
(HERS)
broadcast
on
Monday
:
15115,
11915,
9745
6:25-
6:45
p.m,
Rome,
Italy
(Italian
Broadcasting
&
TV
System)
4:20-
6:40
p.m,
Cologne,
Germany
(The
Voice
of
Germany)
6:30-
7:00
p.m.
Warsaw,
Poland
(Radio
Warsaw)
6:10-
7:10
p.m,
Hilversum,
Holland
(Radio
Netherlands)
6:30-
6:00
p.m,
Hilversum,
Holland
(The
Happy
Station)
—
special
pro-
gram
on
Sundays
only.
;
.,
11950,
9690
-
6:45-
7:00
p.m,
Brazzaville,
FEA
(Radio
Brazzaville,
French
Equatorial
Africa)
11970,
96
6:55-
7:35
p.m.
Montreal,
Canada
(Radio
Canada)
11945
(CKNK),
KLP
7:00-
7:30
p.m,
Bucharest,
Romania
(Bucharest
Calling)
119007
eer
,
7:00-
7:30
p.m.
Peking,
China
(Radio
Peking)
17745,
17720,
7;00-
6:30
p.m,
Prague,
Czechoslovakia
(Radio
Prague)
7:00-
0:45
p.m,
Guatemala
City,
Guatemala
(TGNA)
7:15-
6:00
p.m.
Madrid,
Spain
(The
Voice
of
Spain)
7:30-
§:00
p.m,
Copenhagen,
Denmark
(The
Voice
of
Denmark)
—
no
Eng-
lish
on
Sundays
7:30-
9:00
p.m,
Tokyo,
Japan
(Radio
Japan)
Oslo,
Dinder'd
(Radio
Norway)
—
on
Sundays
only
16175,
11735,
9540
Budapest,
Hungary
(Radio
Budapest)
11910,
9833
Sofis,
Bulgaria
(Sofia
Calling)
San
Jose,
Costa
Rica
(TI
—
The
Lighthouse
of
the
Caribbean)
Berne,
Switzerland
(Switzerland
Calling)
?
3
e38S
ree 22st
$88 SESS 8
vPpy pores
333 33333
a
‘
in
(The
Voice
of
Spain)
Warsaw,
Poland
(Redio
Warsaw)
9525,
6025
Taipei,
Taiwan
(The
Voice
of
Free
China)
15226,
11815
StS SS2eR
Ber
TIME (PST)
10:30-
2:45
a.m.
10:30-11:45
p.m.
12:00-
1:18
a.m,
CITY,
COUNTRY
(NAME)
FREQUENCIES
(ke.)
Wellington,
New
Zealand
(Radio
New
Zealand)
9540
(ZL2),
6080
(ZL7)
Papeete,
Tahiti
(The
Voice
of
France
in
the
Pacific)
6135
Manila,
Philippines
(Call
of
the
Orient)
17805,
15300,
11855,
9730
NEWS
BROADCASTS
FOR
WESTERN
NORTH
AMERICA
The
following
listing
of
news
broadcasts
has
been
prepared
for
those
readers
living
in
the
Weatern
United
States
and
Canada.
Times
are
given
in
Pacific
Standard
Time
and
the
(requencies
in
kilocycles.
TIME
(PST)
6:45
a.m.
7:00
a.m.
7:30
a.m.
8:00
a.m.
:00
a.m.
12:00
Noon
wo
3
sssss
333333333333333333
ow
vo
SSSSSuss
w
SeSSSSo5S8Ssserssssscsssss
B55 02000 ewe e@e IO COO meee eww
SHVUVOYVUUVU VUE DUUUDUYVODUDUUUUVUUUUUDUUUUUD
3333333333333 3333333333333
les
.-)
e
3
CITY
AND
COUNTRY
FREQUENCIES
(ke.)
Djsatarta,
Indonesia
9710,
4910
Manila,
Philippines
11885,9730
Melbourne,
Australia
Stockhoim, Sweden
London,
England
London,
England
London,
England
Tokyo, Jepan
Moscow,
USSR
Moscow,
USSR
Oethi,
India
@,
French
Equatorial
Africa
Moscow,
USSR
17065,
15140
Montreal,
Canada
11945,
9565
Bucharest,
Romania
11937,
9570
Peking,
China
17748,
17720,
15350,
15118
Prague,
Czechoslovakia
9505,
6170,
6105,
4055
Madrid,
Spain
9360,
6130
en,
Denmark
(only
Mondays)
9520
Tokyo,
Japan
15225,
11705
Moscow,
USSR
17865,
15140
Oslo,
Norway
(only
Sundays)
3$175,
11735,
9540
Sofia,
Bul
9700
Madrid,
S
9360,
6130
Berne,
Switrerland
11865,
9535
Bucharest,
Romania
11937,
9570
Taipei,
Taiwan
18225,
13015
Moscow,
USSR
17065,
15140
French
Equatorial
Alrica
pain
Warsaw,
Poland
9525,
6025
i,
taiwan
1$225,
11815
9540,
6080
6138
Wellington,
New
Zealand
(not
on
Sunday)
9540,
6080
Me
Philippines
11855,
9730
REPRINTED
FROM
POPULAR
ELECTRONICS
BY
PERMISSION

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CiRCUIT THEORY
ANTENNA STAGE
The RF amplifier V1 provides the necessary gain and preselection required for high sensitivity and re-
jection of image frequencies, Individual antenna input coils are used for either a balanced or unbalanced
input (depending on method of antenna connection).
The ANT TRIM control, adjustable from the front panel, acts as a compensating capacitor to permit
matching of the input circuits to any antenna.
MIXER STAGE
The use of a separate high-frequency oscillator, V3, results ina more stable receiver, particularly at
the higher frequencies. The output signal from V1 is electronically mixed with the output of V3 in the
mixer tube V2, V3 provides a signal 455 KC higher than the incoming signal on all frequency ranges,
Q-MULTIPLIER AND BFO
The
Q-Multiplier
circuit
(V4)
serves
as
both
BFO
and
Q-Multiplier
in
this
receiver,
Used
as
a
BFO
for
CW
and
SSB
operation,
the
circuit,
which
acts
as
an
oscillator,
is
coupled
to
the
IF
stage
(via
stray
coupling)
and
provides
the
signal
necessary
for
producing
a
beat
note,
or
for
carrier
reinsertion
during
SSB
operation,
When
the
SELECTIVITY
control,
comprising
R26
and
S4,
is
in
the
CW-SSB
position
during
this
operation,
R26
is
in
its
maximum
position.
The
frequency
of
the
signal
is
varied
by
means
of
C31,
the
BFO-Q-MULT
FREQUENCY
control, This
adjusts
the
pitch
during
CW
operation
or
clarity
of
speech
during
SSB
operation.
For
Q-Multiplier
operation,
S4
is
switched
away
from
the
CW-SSB
po-.
sition,
thus
connecting
the
circuit
directly
to
the
IF
stage
through
a
coupling
capacitor
C9,
The
circuit
serves
as
a
positive
feedback
device
having
a
highly
selective tuned
circuit
which
acts as
a
narrow
"gate''
for
IF
frequencies,
The
width
of
this
gate
is
adjusted
by
means
of
R26
which
controls
the
gain
of V4, The resultant narrow peak can be moved around in the IF pass-band by adjustment of C31. The
selectivity thus becomes adjustable and, in addition, the portion of the signal which contains the least
amount of adjacent signal interference can be selected.
IF STAGES
Two
stages
of
LF
amplification,
V5
and
V6,
provide
sufficient
gain
and
selectivity
for
good
performance.
For
maximum
selectivity,
double-tuned
transformers,
T2,
T3
and
T4,
are
used
for
interstage
coupling.
High-Q
permeability-tuned
transformers
improve
performance
and
add
to
ease
of
tuning,
R24
varies
the
gain
of
V6
and
therefore
acts as
the
IF
GAIN
control,
The
S-meter
is
placed
in
the
circuit
in
such
a
manner
that
readings
increase
with
signal
strength,
R28,
the
ZERO
ADJ
control,
is
adjusted
for
zero
current
through
the
meter
with
no
signal
input,
.The S-
meter
is
only
accurate
when
the
IF
gain control
is
at
maximum,
nor
does
the
meter
function
prop-
erly when AVC is off,
DETECTOR, AVC, ANL, Ist AUDIO
One
diode
of
V7
(pin
5)
serves
as
both
detector
and
AVC
rectifier.
The
rectified
AVC
voltage
is
ap-
plied
to
RF
stage
V1
and
IF
stage
V5
to
keep
the
output
level
of
the
receiver
constant
regardless
of
input
signal
variations.
In
the
MVC
position
of
S6,
the
AVC
is
grounded
and
is
not
in
operation.
The
other
diode
(pin
6)
acts
as
an
automatic
noise
limiter
by
cutting
noise
peaks
(caused
by
auto
ignition,
etc.)
during
reception.
Since
this
causes
a
slight
reduction
in
fidelity,
the
circuit
should
only
be
used
when necessary,
The rectified signal from the detector is fed to the grid of the triode section of V7 which acts as the Ist .
audio amplifier, Audio level is adjusted by means of R25, the AF GAIN control,

eames shee
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AUDIO AMPLIFIER
V8
is
employed
in
a
conventional
resistance-coupled
audio
amplifier
which
is
connected
to
output
trans-
former
T5,
Taps
are
provided
on
the
secondary
of
the
transformer
for
4
or
8
ohm
speakers,
A
stand-
ard
phone
jack,
accessible
from
the
front
panel,
permits
the
use
of
low
impedance
headphones
when
de-
sired,
Insertion
of
a
plug
in
the
jack
automatically
disconnects
any
speaker
connected
to
the
8
ohm
tap.
RECTIFIER
V9
functions
as
a
full-wave
rectifier
in
a
conventional
power
supply
circuit.
C26,
R23
and
C27
provide
the
necessary
filtering.
The
primary
of
the
AC
power
transformer
is
fused
for
safety.
The
tapped
primary
also
permits
the
use
of
the
receiver
on
low
AC
voltages
(less
than
100),
voltage
selection
being
effected
by
S3,
In
most
cases
however,
the
switch
should
be
left
in
the
117V
position,
FUNCTION SWITCH
This
switch
determines
the
mode
of
operation.
In
all
positions
except
OFF,
AC
power
is
applied
to
the
primary
of
Tl,
thus
powering
the
receiver.
In
REC
AM,
DC
plate
voltage
is
applied
(through
the
external
jumper
plug
and
the
switch)
to
Vi,
V2
and
V3.
All
other
tubes
(except
V4)
receive
DC
plate
voltage
direct
from
the
power
supply.
In
the
SEND
position,
plate
voltage
to
V1,
V2
and
V3
is
cut
off,
In
the
Q-MULT
position,
plate
voltage
is
also
applied
to
V4,
in
addition
to
all
other
tubes,
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—1—

11
RF
MIXER
Q
MULTIPLIER-BFO
ifr
\F2
DETECTOR,
ANL,
15°
AUDIO
AUDIO
OUTPUT
VI
6BAG
V2
G6BE6
V4
GAVE
V5
6BAG
V6
6BAG
V7
GAVE
VB
GAQ5
ow,
\,
S5
J2
PHONES
6n
4#Q
0
ovreur
t
V9
5CG4
(SY3)
5
|
ek
4
ee
d
Sore
FATERNAL
PLUG
A
seep
plage
ae
tf
S
iN
t
SNORTING
|
'
No}
6
PAR
j
aie
4
'
|
0
a
1
EF
AL
\
FUNCTION
33
;
SWITCH
j
1777
!
:
|
|
Zi
!
AC
tI7V
bree
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pee
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H
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=
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=
an
een)
—
Lede
Sonne
Tete
|
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u
soi
eet
ee
Se
Sl
"
T€BIR
Mi
Tove
NOTES:
S-2
SHOWN
IN
HIGH
RANGE
POSITION
(10.5-30MC)
+ CHASSIS GROUND.
S-|
SHOWN
IN
‘OFF’
POSITION.
SWITCH
S-2
SCHEMATIC
DIAGRAM
HE-30

12
SERVICE
This
section
contains
information
which
will
aid
qualified
service
personnel
in
the
servicing
and
align-
ment of your receiver.
CHASSIS REMOVAL
The top cover is held by four screws - two each side. The bottom cover is held by six screws on the
underside of the unit.
IF ALIGNMENT
EQUIPMENT REQUIRED:
AC Voltmeter
Calibrated RF Signal Generator
Non-Metallic Alignment Tool (GC No, 8722 or equiv.)
1,
Connect
a
loudspeaker
to
the
output
terminals,
Remove
the
local
oscillator
V3,
6BE6,
from
its
socket,
2. Set the receiver controls as follows:
FUNCTION switch on REC AM
AF GAIN control to maximum
. SELECTIVITY control on CW-SSB
IF GAIN control 3/4 full position
MVC - AVC switch on MVC
ANL off
3. Connect the voltmeter (3 volt AC range) across the speaker terminals.
4,
Connect
the
signal
generator
between
pin
7
of
V2
socket
(6BE6
mixer
tube)
and
ground,
5.
Set
the
signal
generator
at
455KC
and
modulate
it
with
either
400
or
1000
cycles
(30%).
6.
Adjust
the
secondary
and
primary
of
IF
transformers
T4,
T3
and
T2
(see
Fig.
A).
Follow
the
order
given
—
secondary
first,
then
primary
in
each
case.
Topside
adjustments
are
secondaries,
bottom
of
chassis
adjustments
are
primaries.
During
alignment,
lower
the
generator
output
progressively
to
prevent
overloading,
Repeat
align-
ment
until
no
further
improvement
is
noted.
BFO
AND
Q-MULTIPLIER
ADJUSTMENT
l.
All
receiver
controls
should
be
set
as
in
the
IF
alignment
with
the
exception
of
the
following:
FUNCTION switch to Q-MULT
BFO-Q-MULT
FREQUENCY
to
mid-position
(white
dot)
Reduce AF GAIN
2, Set the generator to 455KC, unmodulated RF.
3,
Adjust
the
BFO
coil
T6
(located
next
to
V4,
Q-MULT)
until
a
zero
beat
is
heard
(also
accompanied
by
a
peak
reading
on
voltmeter).
hig

THESE TWO ADJUSTMENTS MADE
WITH
BOTTOM
COVER
REMOVED-
REMAINDER
OF
RF
ALIGNMENT
CARRIED
OUT
WITH
COVER
IN
PLACE
PRIMARY ADJUSTMENTS OF IF
TRANSFORMERS — SECONDARIES
ADJUSTED FROM TOPSIDE
FIGURE A
13

~ RF ALIGNMENT
1,
Replace
V3,
6BE6
local
oscillator,
in
its
socket.
2.
Using
a
short
jumper
wire,
connect
antenna
terminals
A2
and
E
together.
3,
Connect
AC
voltmeter
(3
volt
range)
and
loudspeaker
across
speaker
terminals.
4,
Connect
the
modulated
output
of
the
RF
signal
generator
to
antenna
terminals
Aland
E,
5.
Rotate
the
ANT
TRIM
control
until
the
capacitor
plates
are
half-meshed.
If
the
indicator
dot
on
control
knob
is
not
at
the
12
o'clock
position,
loosen
set
screw,
place
knob
in
this
position
and
tighten
screw
again
(without
disturbing
position
of
capacitor
plates),
Do
not
change
control
from
the
12
o'clock
position
until
alignment
is
completed.
6.
Set
all
receiver
controls
as
for
IF
alignment,
Set
BANDSPREAD
pointer
at
100
on
Logging
Scale
and
make
sure
FUNCTION
switch
is
on
REC
AM.
7,
Carry
out
alignment
as
indicated
in
the
chart.
Note:
Lower
generator
output
progressively
to
prevent
overloading
as
circuits
come
into
line.
osc. MIX. ANT.
coil
=
@lot
@Lm!
@Olc!
|
O5-30
TRIM.
Q@Co-|
OCm-|
@
TRIM @Qco-2 Ocm-2 @
4.8-14.5
COIL
@Lo-2
@tm-2
Ola2
@
TRIM.
@QCo3
QOCm-3
@
coil
@lLo-3
OlLm-3
Ola-3
Oco-4
Ocm-4
@
BC
1.6-4.8
FRONT OF pie
FIGURE
B
LOCATION
OF
RF
ADJUSTMENTS
See
ees
14

RF ALIGNMENT CHART
SIGNAL
GENERATOR
.6 MC (600KG)
BAND
SELECTOR
Co-5 (Osc)
Adjust for peak Figure
reading on voltmeter
Go-4 (Osc)
2 1,4 MC (1400KC) se
Repeat steps 1 & 2 until calibration is correct at both ends of scale (.6 and 1.4MC), The remain-
der of the alignment must be carried out with the bottom cover in place, Remove power first.
3 .55-1,6 1.4MC (1400KC) | 1.4 MC Cm-4 (mixer)
Adjust f ak
4 1,6-4.8 2.0 MC 2.0 MC | Lo-3 (Osc) puny poreee
reading on voltmeter
5 1,6-4,8 4.0 MC 4.0 MC Co-3 (Osc)
Repeat steps 4 and 5 until calibration is correct at both ends of the scale (2.0 and 4.0 MC)
6 1,6-4,.8 2.0 MC 2.0 MC Lm-3 (mixer) Adjust for peak
7
1,6-4,8
4.0
MC
4.0
MC
Cm-3
(mixer)
reading
on
voltmeter
Repeat steps 6 and 7 until calibration is correct at both ends of the scale (2.0 and 4.0 MC)
8 1,6-4,8 2.0 MC 2.0 MC | La-3 (Ant)
9 4,8-14,.5 | 5.0 MC 5.0 MG | Lo-2 (Ose) fajust-for Beak
reading on voltmeter
10 4.8-14,5 14.0 MC 14.0 MC Co-2 (Osc)
Figure
Repeat steps 8 and 9 until calibration is correct at both ends of the scale (5.0 and 14.0 MC)
B
11 4,8-14,5 5.0 MC 5.0 MC Lm-2 (mixer) Adjust tor peak
12 4,8-14.5 14.0 MC 14.0 MC | Cm-2 (mixer) reading on voltmeter
Repeat steps 11 and 12 until calibration is correct at both ends of the scale (5.0 and 14.0 MC)
13 4,8-14,5 5.0 MC 5.0 MC La-2 (Ant)
; Adjust for peak
14 10,5-30 13.0 MC 13.0 MC Lo-1 (Osc)
reading on voltmeter
1) 10,5-30 28.0 MC 28.0 MC Co-1 (Osc)
Repeat steps 14 and 15 until calibration is correct at both ends of scale (13.0 and 28.0 MC)
16
10,5-30
13.0
MC
13.0
MC
Lm-1
(mixer)
Adjust
for
peak
17 10.5-30 28.0 MC 28.0 MC | Cm-1 (mixer) | *¢2ding.on voltmeter
Repeat steps 16 and 17 until calibration is correct at both ends of scale (13.0 and 28.0 MC)
Adjust for peak
La-1 (Ant
( ) reading on voltmeter
18 10,5-30 13,0 MC 13.0 MC
15

am.
s
VOLTAGE MEASUREMENTS
Voltages taken with receiver controls in the following positions
BANDSPREAD pointer at 0 on Logging Scale
MAIN TUNING pointer at 0 on Logging Scale
FUNCTION switch on REC AM
AF GAIN control fully counter-clockwise (minimum)
SELECTIVITY control on CW-SSB
BFO-Q-MULT FREQUENCY control on mid-position (white dot)
BAND SEL on .55-1.6
IF GAIN control fully counter-clockwise (minimum)
MVC-AVC switch on AVC
ANL switch on "off" position
Short Al, A2 and E with jumper wire
Voltage selector switch in 117 volt position
SOCKET PIN NUMBERS
1 2 3 4 5 6 7 8 9
RF
Vil
(6BA6)
0
0
6.3V
AC
0
135
135
3.5
-
-
MIXER
é
V2
(6BE6)
-7,7
3.6
6.3V
AC
0
125
125
- -
-
OSC
V3 (6BE6) -7.7 0 6.3V AC 0 125 125 125 - -
Q-MULT
.
V4
(6AV6)
**2,2
Meg
**3.3K
6.3V
AC
0 0
0
135
-
-
lst IF
V5
(6BA6)
0
0
6.3V
AC
0
135 135
19
-
-
2nd
IF
.
V6
(6BA6)
0
0
6.3V
AC
0
135
135
19
-
=
Detector,
ANL
2
Ist audio
V7
(6AV6)
-.3
0
6.3V
AC
0
-.06
-.08
70
-
-
Audio Output
V8
(6AQ5)
0 7
6.3V
AC
0
200
135
NC
-
-
Rectifier
V9
(5Y3)
NC
205
NC
200
NC
200
NC
205
-
*
Place
FUNCTION
in
Q-MULT
position
and
remove
V4
from
socket,
Check
voltages
from
top
of
socket
(numbering
is
now
counter-clockwise)
**
Resistance
measurements
taken
at
these
pins
-REMOVE
AC
POWER
FROM
RECEIVER
FIRST
1,
Voltages
taken
with
20,000
ohms
per
volt
meter
and,
unless
otherwise
noted,
measured
from
chassis
ground
to
joint
indicated,
Line
voltage
maintained
at
117V
AC
for
these
measurements.
Tolerance
on
components
permits
a
variation
of
15%
in
readings.
All voltages DC unless otherwise noted.

DIAL CORD STRINGING
Set main or bandspread tuning capacitor as indicated, In both cases, tie dial cord to spring at the
START point, leaving approximately 4 inches of cord free at this point. Restring in the direction in-
dicated, keeping a moderate amount of tension on the cord, Make final tie to free end of cord from
spring after cutting off any excess cord,
POINTER TO 100
ON LOGGING SCALE
ie iad LEAVE 4" FREE
a Se {
Vv f AT START
G
~ aa
ie .
2-3 TURNS FINAL TIE
MAIN PULLEY
FULLY COUNTERCLOCKWISE-
CAPACITOR PLATES FULLY
OPEN.
MAIN TUNING DIAL CORD STRINGING
LEAVE 4" FREE FINAL TIE
AT pa ey
BANDSPREAD
TUNING
SHAFT
~—BANDSPREAD PULLEY
FULLY COUNTERCLOCKWISE-
CAPACITOR PLATES FULLY
OPEN.
NL 45%
2-4
TURNS
s
|
rf — san
POINTER TO I00
ON LOGGING SCALE
BANDSPREAD DIAL CORD STRINGING

18
CIRCUIT DESIGNATION
cl, C5
C2, C4, C6, C7, C13, C14,
C15, C16, C17, C18, C19
C3
C8, C20, C22
c9
C10
Cll
Cl2
C21, C23, C28
C24
C25
C26, C27
C29A
C29B
C30
C31
R6
RT, R1l, R14, R16
PARTS LIST
DESCRIPTION
CAPACITORS
250 mmfd, mica
0.01 mfd, disc
0.05 mfd, tubular
100 mmfd, mica
0.005 mfd, disc
0.001 mfd, mica
0,003 mfd, mica
500 mmfd, mica
0.01 mfd, tubular
10 mfd, electrolytic
0.005 mfd, tubular
40-40. mfd,;- 300 volt electrolytic
Main Tuning Capacitor
Band Spread Tuning Capacitor
Antenna Trimmer
50 mmfd, variable capacitor (BFO)
RESISTORS
47 ohm, 1/4 watt
1M (meg) ohm, 1/4 watt
330 ohm, 1/2 watt
22 K(kil) ohm, 1/4 watt
1K ohm, 1/2 watt
22K ohm, 1/2 watt
2,2M ohm, 1/4 watt
3.3K ohm, 1/2 watt
100 K ohm, 1/4 watt
2.2K ohm, 1/4 watt
47K ohm, 1/4 watt
4,7M ohm, 1/4 watt
220 K ohm, 1/2 watt
470 K ohm, 1/4 watt
470 ohm, 1 watt
2K ohm, 10 watts
10 K ohm, IF Gain Control
500 K ohm, Audio Gain Control
10 K ohm, Selectivity Control
30 ohm, 1/4 watt
500 ohm, S-meter Zero Adjust
TUBES
6BA6
6BE6
6AV6
6AQ5
5Y3
#40 light bulb
QUANTITY
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Nee NN WwW
PART NO,
30-100
30-101
30-102
30-103
30-104
30-105
30-106
30-107
30-108
30-109
30-110
30-111
30-112
30-113
30-114
30-115
30-116
30-117
30-118
30-119
30-120
30-121
30-122
30-123
30-124
30-125
30-126
30-127
30-128
30-129
30-130
30-131
30-132
30-133
30-134
30-135
30-136
30-137
30-138
30-139
30-140
30-141
30-142