Cubic SWAN SS-15 User manual

IIt
It
II
PRELIMINARY
OPERATIONS I\{ANUAL
I
'swANMoDEL SS-15,SS-100
ANDSS-200
' SINGLESIDEBAND
TRANSCEIVERS
Gl Swaff,\
Y ELECTRONICS
A subsidiatyol Cublc Cotporctlon
' 305Alrporl Road
Oceanslde,CA 92054
Phone
(7141757-7525
to/78

- :Li 3.*-::qd,aa:, i1*-t: :
r.+f
:$\r tr.*.<i lf.!*
FOREWORD l
We
know
that you wiLl enjoy your Han-equipnentt
a"tciiuea in this manuaL,
fof years to cone
'
ffit engineeri;;- nouis
.
ttlyu be-en
spent to make
this equipmeni
Ttt" best tht! youl money buy'
w;-;";dt"lru,'rto*"vei, probleins
do occur from
'
tine to tine. --i; thil i'espect,-TP
"o*11 like ;
to bring.your aiiention to our l"iberal warranty
poLicy as stat;e-oii-itru back cover of this
manual. We
"iro invite you to visit, call or
write Swan
Electronics oi its authorized deal"ers
'
li
-1-

TABLEOF CONTENTS
INTRODUCTION
SPECIFICAT
IONS
INSTALLATION
General
Selection of Transceiver Model and 0ptions
RF
Anplifier Connections
PowerSource
Speaker
Cool
irtg
Antenna
External VFO !
Microphone
CW
Key or Keyer Connection
External Relay
OPERATION
Control Functions
Initial Control Settings
Initial Power0n
Cal
ibrati:on
, WWV
Reception
Nqise 'Blanker
Transnit - SSB
Transmit - CW
rrSfr
Meter AdiuStment
CW'sidetone
Volume
Adjustment
External" VFO
CIRCUIT
THEORYOFOPEMTION
General
Transceiver Systen
Receiver Circuits
RCVRMIXER
Noise Bl-anker
Filter Driver and Noise Switch
XTAL
Filter
IF Amp
AGC/ALC
VFO
PRODDETECTOR
Carrier Osc.
Audio Anp
Crystal Calibrator
8 V Regulator
Transmitter Circuits
Speech funp
BalancedModulator
XTAL
FiLter
IF Amp
XMITMixer
Page
1
3
4
4
4
5
6
8
8
8
9
I
o
10
10
16
L7
L7
L7
18
18
18*
19,
19'
19
20
20
20
?0
22
22
22
,, 1
LL
22
23
23
2tr
23
24
z4
24
24
24
26
z6
27
)'7
-ii-

Broadband
Driver
Pre Drive
Dr
iver
Low Pass Filter Assembly
ALC
Directional Detectoi
SS-100
and SS-200
Amplifiers
VOXControl
Keyer
Sidetone Oscillator
Carrier Osci1lator.
Acces
sories
z7
27
11
Lt
27
27
28
28
28
28
28
29
-iii-

,1
,rit
A
!t
i.-.J
FIGURE
1
2
3
4
5,
6
ILLUSTRATIONS
DESCRIPTION
Model $S-15 - Rear View
Models SS-100
'and SS-200
- Rear
PlrfR
Connector Wiring Diagram
Block Diagran - Recedver
BLoskDiagram - Transnitter
. Crystal Filter Passband
GraPh
View
PAGE
5
5
7
2L
26
26
l,
-tv-

INTRODUCTION
The swan
Models ss-15, ss-100 and ss-200 single sideband Trans-
i"i""ii -together with their optional equipment ?y designed to
be used in the amateur radio bands 80, 40, 20, 15 and 10 meters
either in the SSB
or CW
modes. These Swan
transceivers are
aeiig"ea with the latest state-of-the-art solid-state circuits,
and ifre construction includes Swan's superb craftsmanship' Tug-
g"drr"tt and reliability. Ma1I,
years cif-
trouble free operation
Ean be expected from tirese filhtweight.and durable units whether
they are operated fixed station or nobile.
The SS-15
provides a powe{ input of 15 watts P.E.P. and the SS-100
tna SS-
200^
provide 10'0
and 20b watts P.E.
P. respectively' The
solid-state circuits in these transceiveTs provide for, among
other things, broadbandtransmitter circuits that require no
tuning, SWF.
protection from open to shorted antenna circuits,
"pp"i"u"a foiver sideband selettion, semi-break-in CW
operation
with built-in monitor, VOX,
a 25 KHz
crystal calibrator with pro-
visions for tuning in WWr-and external VFO
connections with
switching for split-frequency operation.
-1-

Added
enjoyment wiLl be realized through the usage of sone of
the optional equipnent availabLe for these transieivers. Those
listed with the transceiverrs specifications are reconmended.
Particul4[_attention shouLdbe given to the power suppLies if
adequate DC.Bowet
is not available.
The foLLowing sections of this manual-
provide infornation
pertaining to instaLlation, operation, circuit theory, trouble-
shooting recommendations,
and a parts 1ist. Please i6rer to
the Tabl"e
of Contents for the listing of page nunbers of speci-
fic information, illustrations and other peitinent information.
a

O sPEctFtcATtoNs
SS.15,SS.1OOAND SS.2OOTRANSCEIVERS
FrequencyRanges
.. 80meters 3.5- 4.0MHz
40 meters 7I- 7.45MHz
20 meters 14.0-14.45 MHz
15meters 21.0-21.45
MHz
10meters 28.O-29.7 MHz
WWV
Receive10MHz
. Downapprox.
-30
dB
. Downmorethan50dB
. Greater
than60dB
. Output impedance 50 ohm nominal,
2 to 1typical.
. For CWmonitoring
, Equivalentto grid-block
keying.Semi.
break-inwith VOX,
.25kHz marker
. Crystal lattice filter with 2.7 kHz
bandwidth,
1.7
shape
factor.
. Audio responseessentiallyflat from
300to 3000 Hz + 3 dB. Audioout-
put 4 wattswith lessthan 107odistor-
tion,to 3.2ohmexternalspeaker.
. Less
than 0.5 microvoltsat 50 ohms
impedance
for signalplus noise
to
noiseratio
of 10dB.
. Minimum
-55dB at 30 MHz,increas.
ing
to betterthan
-75
dBat3 MHz.
.WhenVSWRis3:1 or more,will cut
power by 20%. Under thesecondi-
tions,
will haveinfinite VSWR
protec-
tionincluding openorshortcircuit.
Distortion
Unwanted
Sideband
Suppression
CarrierSuppression.
TransmitterOutput
AudioSidetone...
CWKeying..:...
Calibration,,r.,.
l.F.Selectivity
...
A.F.Selectivity...
Receiver
Sensitivity
' lmageRejection . .
VSWRProtection,
.
Power
SupplyRequirementi
SS-200 13.5 VDC
(nominal)
at 20amps
CW
Average 6ampsSSBTransmit
: 0.5ampsReceive
SS-10013.5
VDC
(nominal)
at 11amps
CW
Average
,3.5
amps
SSB
Transmit
I 0.5ampsReceive
SS-15 13.5
VDC
(nominal)
at 2amps
CW
0.5ampsReceive
Power
Input . .Model SS-200
* SSB,
suppressed
car-
ffi,.'3,i,ttt'J.l';
J,'ilH*:iI
bands.
rier: 100wattsP.E.P.
minimumall
bands.CW: 100
watts
DCinputonall
bands. RTTY/SSTV: 100wattscon-
tinuous.
Model SS-15- SSB,suppressedcar.
rier: 15
watts
P.E.P.
minimumon all
bands.
CW: 15 wattsDCinputonall
bands. RTTY/SSTV: 15 watts
continuous.
Dimensions
SS-15
. .,.12y2"Wx6"Hx1O%"D
SS-100 ...12yr"Wx6" Hx11%"D
SS-200 ....12%" Wx 6"Hx12" D
Approximate
ShippingWeight
SS-15. ..16|bs.
SS-100 ...181bs.
SS-200 ...19|bs.
-3.:

GENERAL
The Swan
SS-15, SS-100
and SS-200
transceivers are specifically
designed for ease of installation anq operation. A few basic
conslderations and steps are required during the installation
process. Please revieir carefully the following installation
information.
SELECTION
OF TRANSCEIVER
MODET
AND
OPTIONS
The basic unit, SS-15, provides a power input 9{ 15 watts P.F.P.,
and if additional power-input is desired, consideration may
be-
given to either thA SS-100-
(for 100 watts P.E.P.) or the SS-200
(for 200 watts P.E.P.).
These transceivers require a power source of LZ tO 15 volts DC.
It is irnportant to note that different current requirements
exist deirending
on which rnodel is_usedr
-and_spe-cific yo1!"g9
regulatibn reqlirements nust be observed. In the case of the
SS:200, the current requirenent is 20 Amps. If al,adequate
voltage and current source is not available r (..rotrsideration
[ry- -
be giien for the use,of one of Swanrs
power supplies. The PS,-10
pow6r supply provides the necessary power requirenents for the
SS-f5 ani- S'S-1OO,
and the PS-20 can be used for all units.
FoLlowing paragriphs in this section discuss specific voltage,
current inb voitale regulation requirements. Be sure to review
this section.
Provisions have been nade in the design of the transceiver for
the use of an external VFO. The advantage for using a second
VFO
is the ability to work split.frequency. (Spfit-frequency operation
is useful wheirit is desired to work foreign SSB
DX stations out.
side the Arnerican phone bands and in sone_CW
app]-ig"!ioqs) r-
Consideration maybe given to the use of Swanrs
Model SS-208.
A number
of accessory items are available for use with these three
transceivers. It is' recommended
that you contact yo0r Swan
dealer
or the Swan
factory in Oceanside, California for additional
information.
INSTALLAT
ION
-4-

RF AMPLIFIER
CONNECTIONS
The Model SS-15 contains the RF Amplifier inside the transceiver
case. Proper installation irivolvei only the connection of a
coaxial jumper cable between the IN and OUTLINEAR
AMP
coax con-
tr".ior oit th" rear panel. (See Figure 1). Check.to.determine
Cft"t this jumper is^in place. If the jumper is missing or lost,
one can be made from RG-58U.
-1
FIGURE
1
ANT'NiIA
' I t' ':t" i
d;;jr
In either the Model ss-100 or ss-200, the RF
Amplifier will be
^o""i"atOtt itt" rear panel of the transceiver. The input aTd-
output connections oi lltg RF
Amplifier.are made
using coaxial
cabies and corinectors which are-
aligned with the IN and OUT
LINEAR
AMP
conn"itotr. (SeeFigure-2). Checkto determine that
i["i" i"p"t and output connections are properly connected and
seated in the rear panel connectors.
FIGURE
2
-5-
ffi
0C pvct

The transceiver can be nodified fron a SS-15 to either a Model
SS-100or SS-200
at any tine following purchase. The SS-100
or
SS-200RFAnplifier is mounted in place on the rear panel, taking
care that the power connector for the RFAmplifier is properly
seated and connecting the input and output coax cables. (See
Figure 2), The coaxial jumper cable used for the SS-15
must be
removed. (If the jumper is left connected and a SS-100or SS-200
RF
Amplifier is mountedin place on the rear panel, the trans-
ceiver will operate as a-SS-15but will +o! give any ALC indica-
tion or control and can be easily oil6itlirven causr.ng
distortion
and possible pernanent danage). The transceiver can also be
modified from ? SS-100to a SS-200by just replacing the RF
Amplifier with the correct unit.
POWER
SOURCE
Whenusing a Swan
power supply with the transceiver, plug the
output cable from the power supply into the DC
PWRconnector on
the-rear panel of the transceiver. Connect the lrower supply AC
cord to 120 VAC. It should be noted that the Models SS-15
and
SS-100
transceivers require the Swan
Model PS-10powelrsupply
and tlie Model SS-200
transceiver requires a Swan
Model"
PS-20
power supply.
A power supply or a battery source of, IZ to 15 volts DC (negative
grbund) is'ieQuired. Undei" no circunstance should the input voltage
6e al1or^redto -exceed
15 volts. Unreliable transceiver performance
nay occur if the input voltage drops nuch below 17,volts. - Voltage
regulation at the DC
PWR
connector should be such that under full
load the input voltage at the connector would be greater than 11
volts and with little or no load the input voltage would be no
more than 15 volts. In order to obtain specified transceiver per-
formance as listed in the transceiver I
s specification , 13.5 volts
is required at the DC
PWR
connector at fu1l load. It is recommended
that fu1l power output in the CW
modeby used for full load -during
vo,ltage re-gulation measurernents. The following table provides. the
naximum
cuirent requirements for the three transceivers in various
operational nodes. - The proper DC
PWRconnector voltage and speaker
connections are shownin Figure 3.
SS-15 ss-100 ss-
20.0
5OO
MA
6 Amp
20 AUtp
2
0 Arnp
Receive Current 500 MA
SSBAverage Current 800 MA
SSB
Peak Current 2 Amp
CW
(Key Down) (Current) 2 Amp
5OO
MA
3.5 Amp
11 Amp
11 Amp
-6-

,r4*$:r*alii*Y
CINCH-JONES
PLUG
GREY
BLACK SO
RED
RED
NN
SOLDER
CONN
UNGROUNDED
SPEAKER
#10CABLE
CHASSIS
GROUND
FUZE
SPEAKER
FIGURE
3
A Spe'aker
is provided in .the Swan
power supply cabinet and con-
;";ii;;-ir-".io*piitnua'through th-e
DCPWR-
connector
and
power
;;ppit ."Ur". Wiren
a Swan
porygrsupply is not used , a 4 to 8
ohin^
sbeaker
is i".o**urded.' (Do
not-use a speaker
or speaker.,
_
cornbiiration which is less than 4 ohms as permanent damage Eo Ene
;;el;--;piiriai ."" occur). Figure3 shows,
the proper
pin con-
nection for' the 'speaker on the Dc PWR
connector
, aAUTION
n D0 NgTground either speaker 1ead. Audio talk-back
during transnit and/ot'
possible damage.
to the audio
r*"f iFi"i .o"ia 'occur. 'Following speaker hook-up,
il'r;i;lly uii"g the audio level np gradually ald
listen fbr no iudio or weak audio with distortion.
If this is detected, look for a groundedspeaker
lead irnrnediately.
LzV
BATTERY
-7-

COOL
ING
The transceiver should be placed in the operating area to insure
the RF Amplifier heatsink at the rear of the transceiver is not
blocked. Adequate ventilation nust be maintained in this area
to insure that the transistors in the linear amplifiers are not
damaged. Cool operation of these transistors will insure greater
life expectancy.
ANTENNA
The transceiver is designed to operate into a noninal 50 ohm
resistive 1oad, but it is protected against accidental opens or
shorts in the antenna or high ShrR. Operation into most loads
within 2:1 SWRwill be quite satisfactory. It should be noted
that nobile antennas, particularly on the low frequency barrds,
often present mismatches
greater than 2:L. 0peration into loads
with SWRfsgreater than 2:L maybe practical or useful under
certain circumstances and in energencies, but is not recommended
for regular usage. GeneraLIy the higher the SWR,
the'lower the
power output capability of the transmitter. In somecases the
quality of the transmitted signal may also suffer as SWRis o"1
increased above 2:L. It is recommended
that due consideration
be given to antenna matching for sinplest trouble free operation.
For further discussion on the effects of high SWR,see the section
on OPERATI0N
under "meterrt.
It is reconmended
that the antenna
ground when the transceiver is not
lightning.
Matching the transceiverrs load impedanceis also very import
when an outboard linear anplifier is used. Be sure to check the
SWR
between the transceiverrs output and the input to the linear
anplifer. Keepit under 2:L and as close to 1:1 as possible for
best operation.
EXTERNAL
VFO
be disconnected or switched to
in use as a precaution against
The Model SS-208External VFO
connector on the rear panel.
procedures are required.
connected to the ACCESSORY
other installation steps or
1S
No
-8-

MICROPHONE
The nicrophone input circuit to the transceiver is designed for-
a high imiredance
iricrophone. A good-quality high.output. crystal
rnicrSphon^e
with a push:to-talk switch is recomnended. The micro-
phone plug must be wired to mate with the MIC'j
ack as shown
on
the schenatic drawing.
SLEEVE SLEEVE TIP
TIP (KEYLINE) RING (AUDIO)
CWKEY
OR
KEYER
CONNECTION
THIS COMPLETES
THE INSTALLATION. BEFORE
TURNING
POWER'ON
AND
ATTEMPTING
TO GET
ON
THEAIR, BE SURE
TO READ
ANDSTUDY
TFIE
BALANCE
OF THIS MANUAI.
The CW
keyine circuits in the transceiver can be used with any
k;; ;; r."y"i"."pab1'e of withstanding +15
.volts DC-open
circuit
it6v "p) ind an average current of 6 tUl (key down)-. In using a
fi"yl't iuLtfr
solid-stat6 output switching, be sure that,the keyer
output circuits can withstind the positive voltage__and
currents
.t -!tit"a-
"Uo"". Connect the key br keyer to the KEY
j ack on
the transceiver I
s front Panel.
EXTERNAL
RELAY
The EXT
RELAYconnector on the rear panel provides. a +LZ to +15
u"itt-'nC a;i"t ift" tine that the trinsceiver is in the transmit
mode. This voltage connection can be used for any external relay
application such as controlling an outboard linear amplifier ' .
it;-;;;;;;; i"o* this connecti5n should not exceed one anp into
the external relaY or 1oad.
-9-

OPEMTI
ON
Successful operation of the SwanModels SS-15, SS-100
and SS-200
transceivers dependsalmost entirely on proper installation
followed by a thorough understanding of the simple operational
procedures offered in the following paragraphs. Review once
again to determine that all of the installation recorunendations
madein the INSTALLATIONsection of this manual have been properly
completed.
CONTROL
FUNCTIONS
Before operating,
back and internal
Front Panel:
Main Tuning ,
BAND
AF and RF
review the following descriptions of the front,
operator controls.
I
The rnain tuning knob changes the transceiverrs
operating frequency with a two speed contrgl
at a 36:1 ratio for slow speed and a 6:1 ratio
for fast. The outer scale on the dial is cali-
brated for 3.5 to 4.
0 MHz
; and the inner scale
is calibrated for 28,0 to 29.7 MHz. The center
scale is calibrated for 40, 20 and 15 neters.
It is necessary to add 7, L4 and 2L MHzto the
readings of the center sca1e.
The outer edge of the tuning dial is a logging
scale. It is intended to permit easy and rapid
return to a frequency after a tuning search
nearby. It is also useful in interpolating small
frequency changes. The dial narks are very near
59 1 KHzfor the middle nain scale.
The BANDswitch selects the 80, 40, 20, 15 and
10 meter bands. A11 tuned circuits' the VFO
and low pass filters are selected.
These are dual gain controls. The AF (audio)
is the srnall knob and also the power switch.
Counterclockwise is the por^/er
off position and
low audio. The RF control is the large knob
and full clockwise position is maxinum
gain and
the normal setting for proper "S" meter readings.
-10-

ffi-r|J I
l
l
PRESELECTOR
MODE
VFOSELECTOR
BLANKER
The PRESELECTOR
peaks the RF tuned circuits in
the receiver. It should be set approximately
to the rnarkings corresponding to the selected
band and then peaked for maximumsignal. It
should be noted that other settings could result
in ,other responses. Suggestions are of
fered
later in this section to showhow these can be
used to the operatorrs advantage.
NOTE
0n 5.5 MHz
and 7.0 MHzit is ,possible to tune
the PRESELECTORto the transceiverrs IF fre-
quency (5.5 MHz). The receiver would in effect
6e receiving its own local qscillator. This
can be detected by a "hollow" sound to the
speaker and some
"S" meter indication.
The MODE
switch selects the CWor SSB
modes
of
operation. The NORM
position selqcts the lower
sideband for 80 and 40 meters, and'the upperside-
band for,20, 15 and 10 meters. The OPP
position
selects the opposite sideband frorn that ng,ted
above. CW
selects the CW
rnodeof operation.
The VFO
SELECTOR
switch is used in conjunction
with the Swan
Model SS-208
External VFO. The
"Att position selects transceive operation of
the internal VFO. The rrBrt
position selects
transceive operation on the external VFO, a+d
SPLIT
positibn selects the internal VFO
during
receive and the external VFO
for transmit.
NOTE
If no external VFO
is used or connected, the
VFOSELECTOR
switch must remain in position A.
If the switch is positioned to either SPLIT
or
B either the tranirnitter or receiver will not
function.
The BLANKER
control establishes the threshold
level for pulse type noise blanking-. The switch
in ful1 counterctockwise disables the hoise
blanker circuit. The control is advanced
clock-
wise just to the point to suppress,unwanted
noise'
Advancing the control too far clockwise may
cause cross modulation by other strong signals
on the band.
-
11-

DIAL SET
MIC
MIC GAIN
METER
NOTE
If the crystal calibrator is turned on while
the noise blanker is being operated, the re-
ceiver will be desensitized. This is caused
because the noise blanker reacts to the
crystal calibrator square wave output as if
it were a noise pulse.
The DIAL SET
is used to calibrate the main
tuning dial. This is done by using the
internal 25 KHz
crystal calibrator as a
frequency standard.
The MIC jack is for microphone connection.
It is not necessary to remove the microphone
whenoperating CW.
The MIC GAIN
controls the amountof audio
from the nicrophone to the nodulation circuit
of the transceiver. Increase this" control
clockwise to the point that the meter occa-
sionall-y kicks upward. Further clockwise
increase will not cause increased modulation
but wilL cause the AIC circuit to react t0
control transmitted output and prevent flat-
topping.
The meter indicates frsrf
units during receive
and the ALCaction during transnit. In trans-
mit any upward movement
of the meter indicates
normal ALC action. An upward movement
past 53
is an indication that the MIC GAIN
or CWGAIN
controls rnay be set too far clockwise. The ALC
operation begins (indicated by upward deflection)
when the forward RF output power reaches noninal
(5 watts for the SS-15, 50 watts for the SS-100
and 100 watts for the SS-200) or when the reflected
RFpower reaches 25eo
of this noninal power.
The neter zero control is on the rear panel and
the sensitivity control for rrsrr units is internal
and factory adjusted.
A more detailed explanation of the neter's
indications follows and nay be useful for
understanding sone of the less frequently
encountered conditions.
-12-

wwf44+wr t
:l
i
li
/
I
il
{
:i
{
I
The ALCaction at 25?-
reflected power means
that at 3:1 Sl^tR
the maximum
net power to the
antenna wi1L be'75%
6Tfrfrina1. At higher
SWRIs
even less net power can be develoPg{
"itttitt the control l-imits set by ALC' This
type of ALC
controL is necessary to -protect
the, arnplifier transistors and should not be
alterei in, an attempt to increase output
power.
For some
load inpedances presented to the
amplifier it rnay'-not
be able to quite reach
,i , noininal':power
aira hence no indication will
be seen bn the neter. This can be accentu-
ated by low supply voltage. Fol' example,
the rnaiirnum
ouilut capability characteristic
of this type amififier drops over 30%
from
13.5 vo1t3-
to fi. s volts supply voltage '
should the neter faiL to indicate at naximum
CW
drive or microphone gain, oP€ration may
actually be norrnai
, -
except fpr .reduced
-power
'
ftt" laci< of indicaiion m?ry
be due to either
SlrlR
or low supply voltage of both. 0p91ati9n
nay be quite ilrattigll in these case's
if other
neans to checi<
the RF power outqut and quality
at" employed. In the absence of other means
of chelkiitg, a good rule of thumb is to use
the sane seitings of the CW
DRIVE
and MIC
GAIN
controls al were correct for nominal
supply voltage and a i-:L SWR'
Drive to the transnitter during cI^Ioperation is
i"l Uv tte CW
DRIVE
control. Increase this con-
iiof-lfoCtwir" to the point that the neter shows
;-;ligfit upward moveneirt
during CW
transmissions.
The KEYi ack provides the connection for tlte F"y
"i-f."yi"'. ftt[ transceiverrs deiign is such that
it is not necessary to unplug the.key or close
the key circuit during SSB
operation'
This switch controls the internal crystal cali-
brator. In the CAL
position, the 9-Iysta1
catibrator is on and-
providing 25 KHz
marker
signal-s across each band.
CII DRIVE
KET
OFF - CAL
-
13-

PTT- VOX
VOX GAIN
VOX ANTI
The PTT - VOX
switch controls the VOX
circuitry.
In the PTT
position, the transceiver can be placed
into transmit for SSBby depressing the microphone
push-to-ta1k switch. During CW
operations, the
transceiver is placed into transmit by positioning
the M0DE
switch to CW
for each CWtransmission.
Placing the PTT - VOX switch in VOX
enables the
VOXcircuitry and allows the transceiver to be
switched to transmit in SSBby just speaking into
the rnicrophone or closing the key in CW.
The sensitivity of the VOXcircuit is adjusted by
the VOX
- GAINcontrol. It should be adjusted to
the point where the transceiver transmits with a
normal LeveL of voice.
The ANTI VOX
controls the VOX
circuitry so that
the transceiver will not transmit whenthe micro
phone picks up audio from the transceiver's
speaker. This control and the VOX
GAIN
control
shouLdbe alternatley adjusted so tha! the trans
ceiver transmits on hudiir fron the voice but not
fron the speaker. Position the rnicrophone
to
ninimize its pick-up from the transceiverrs *"
speaker
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BACKPANEL:
IIS''METER
ZERO
SIDETONE
LEVEL
INTERNAL
CONTROLS:
BaLanced
Mod.
V0X,
CWDel.ay
VOX
SSBDelay
ttStt
Meter Sens.
The meter reading fgr rrsrr
units is zeroed by
this controL with the antenna disconnected 6r
the transceiver connected to a dumny
load.
This control adjusts the level of CW
sidetone
heard in the speaker during CW
transnissions.
These controls adJust the null of the RF
carrier. Recorunendations
are offered in the
MAINTENANCE
section for their proper adjustnent.
The length of time that the trans6eiver stays in
transnit foLlowingrthe Last CW
character is'ad-
justed by-this controL. This applies only to
seni-break-in CW
operation usin!- the VoX $
circuitry.
Thu Length of time that the transceiver srays
in transnit folLowing the Last audio sound
transmitted ustng VOXis adJusted by this
control.
The rrS'f
meter sensitivity is factory adjusted.
This- control, located on the main circuit board,
maybe a4jgsted for a different setting or used
to re-cal.ibrate the frS'r
meter.
-15-