Yaesu FRG-100 Manual

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-
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FRG-100
Technical Supplement
YAESU MUSEN CO., LTD.
C.P.0, Box 1500, Tokyo, Japan
YAESU U.S.A.
17210 Edwards Rd., Cerritos, California 90701, U.S.A.
YAESU EUROPE B. Vi
Snipweg 3.1118AA Schipol, The Netherlands

Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-l
Chip C’mponent Information . . . -. . . . . . . l . - -. . - -. . . . *. . . . . . . . . . . . . . . . . . . . . . l-3
Cse Disasembly & &cuit &ard Access - - l . - - - l - l l l - .. - - - - - l l l - - . - - . l - - - ‘J-1
Main Unit
2-l
Local Unit 2-l
Display Unit
2-3
Pilot Lamp & Lithium Battery Replacement
2-3
Resetting the Microprocessor 2-3
&cuit Des&ption ......................... . ... . . . .......m.... ... ..... . . . . 3-l
Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-l
Aligument Preparations & Precautions 4-l
Local Uuit
4-2
Reference Oscillator
4-2
2nd Local Oscillator
4-2
vco 4-2
vco 1&2
4-2
vco 3
4-2
vco 4
4-2
vco 5
4-2
Main Unit
4-2
2nd Local Amplifier
4-2
IF Interstage Transformer
4-2
IFGain 4-2
S-Meter Full Scale
4-3
Noise Blanker
4-3
SSB Squelch Threshold 4-3
Beep Leve
4-3
Block & Interconnection J)iagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-l
PCB Diagram & Pa& List . . . . ... . . . . . . . . . . . . . sm.. . . l m. . . l l l a l . . . . . . . . . . . 6-1
Main Unit
6A-1
Local & OSC Unit
6B-1
PLL DDS Unit 6C-1
CAR DDS Unit
6D-1
Display Uni t
6E-1
SQL,VR,ENC & HP Unit 6F-1
FM hit-lOO( Option) 6G-1
TCXO-4( Option) 6H-1
Mechanical Details . . . l . - - + -. l . . . . . . . . . . . . l . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-l

Introduction
This manual provides technical inf orma-
tion necessary for servicing the FRG-100 gen-
ral coverage communications receiver. It does
not include information on specifications, in-
stallation, and Operation, which are described
in the FRG-100 Operating Manual, provided
with each receiver, or on FRG-100 accessories,
which are described in manuals provided
with each.
Servicing ‘this equipment requires exper-
tise in handling surface-mount components.
Attempts by non-qualified persons to Service
this equipment may result in permanent dam-
age not covered by the warranty.
While we believe the technical information
in this manual to be correct, Yaesu assumes no
liability for darnage that may occur as a result
of typographical or other errors that may be
present. Your cooperation in pointing out any
inconsistencies in the technical information
would be appreciated.
Yaesu Musen reserves the right to make
changes in this receiver and the alignment
procedures, in the interest of technological
improvement, without notification of the
0 wners.
l-l
FRGl 00
Techm*cal Supplement

Chip Component Information
The diagrams below indicate some of the
distinguishing features of common
Chip com-
ponents.
Ceramic Capacifors
-i_
f
Tantalum Capacifors
Negati
(Unit
1 mm)
Type L W T
Resistors
INDICATED LETTERS
1 2 3 4
557s
90
0
Type
RMC l/lOW, 1/16W
Marking*
100,222,473*---
10’s unit
1’s unit
Multiplier
00
10"
1
1
10’
I
22
lo’
1
33 10”
4410’
55
1 OS
66 10”
Examples 1
100 = ion
222 = 2.2kn
473 = 47k0
1-3
FRGl 00 Technicd Supplement

Chip Component Information
Replacing Chip Components
Chip components are installed at the fac-
tory by a series of robots. The first one places
a small spot of adhesive resin at the location
where each part is to be installed, and later
robots handle and place Parts using vacuum
suction.
For Single sided boards, solder Paste is ap-
plied and the board is then baked to harden
the resin and flow the solder. For double sided
boards, no solder Paste is applied, but the
board is baked (or exposed to ultra-violet
light) to eure the resin before dip soldering.
In our laboratories and Service shops, small
quantities of chip components are mounted
manually by applying a spot of resin, placing
with tweezers, and then soldering by very
small dual streams of hot air (without physi-
cal contact during soldering). We remove
Parts by first removing solder using a vacuum
suction iron, which applies a light steady vac-
uum at the iron tip, and then breaking the
adhesive with tweezers.
The special vacuum/desoldering equip-
ment is recommended if you expect to do a lot
of Chip replacements. Otherwise, it is usually
possible to remove and replace Chip compo-
nents with only a tapered, temperature-con-
trolled soldering iron, a set of tweezers and
braided topper solder wick. Soldering iron
temperature should be below 280” C (536” F).
Precautions for Chip Replacement
DO not disconnect a Chip forcefully, or the
foil Pattern may peel off the board.
Never re-use a Chip component. Dispose of
all removed chip components immediately to
avoid mixing with new Parts.
Limit soldering time to 3 seconds or less to
avoid damaging the component and board.
Removing Chip Components
Cl
Remove the solder at each joint, one joint at a
time, using solder wick whetted with non-
acidic fluxes as shown below. Avoid applying
pressure, and do not attempt to remove tin-
ning from the chip’s electrode.
0
Grasp the chip on both sides with tweezers,
and gently twist the tweezers back and forth
(to break the adhesive bond) while alter-
nately heating each electrode. Be careful to
avoid peeling the foil traces from the board.
Dispose of the chip when removed.
0
After removing the Chip, use the topper braid
and soldering iron to wick away any excess
solder and smooth the land for installation of
the replacement part.
FREI 00 Techmkd Supplement

Chip Component Information
--
Installing a Replacement Chip
As the value of some Chip components is
not indicated on the body of the Chip, be care-
51l to get the right part for replacement.
0 Apply a small amount of solder to the land on
one side where the chip is to be installed.
Avoid too much solder, which may Cause
bridging (shorting to other Parts).
.I.
0 Hold the chip with tweezers in the desired
Position, and apply the soldering iron with a
motion line as indicated by the arrow in the
diagram below. DO not apply heat for more
than 3 seconds.
0 Remove the tweezers and solder the elec-
trode on the other side in the manner just
described.
l-5
FRGl 00
Techmkd Supplement

Case Disassembly & Circuit Board Access
- Main Unit Local
Unit
0 Turn off the receiver and disconnect all ca-
bles.
0 Place the set on a stable work surface, and
remove the 8 screws affixing the top cover
(Figure 1).
Figure 1.
0 Carefully remove the top cover, paying spe-
cial attention to the wire connecting the loud
speaker to the main unit. The plug tan be
removed from the socket on the main board
if desired (remember to reconnect before at-
tathing the top cover again).This exposes the
component side of the Main Unit.
0 To remove the main unit, remove the 8 screws
affixing the unit and the screws affixing the
antenna terminal and EXT DC connector on
the rear Panel (Figure 2).
Figure 2.
0
To access the local unit, remove the 8 screws
affixing the bottom cover (Figure 3).
Figure 3.
To remove the local unit, remove the 7 screws
affixing the unit, and the 2 screws used on the
CAT connector on the rear Panel. This ex-
poses the component side of the Local Unit
(Figure 4).
Figure 4.
2-l
FRGl 00
Tmlmical Supplement

Case Disassembly & Circuit Board Access
Display Unit
0 To access the Display Unit (including poten-
tiometer, squelch, rotary encoder and head-
phone jack), remove both the top and bottom
covers as previously described, then remove
the 2 middle screws from both edges on each
side of the display unit (Figure 1).
Figure 1.
0 Next Zoosen the 2 remaining screws Gently
pull the unit away from the Chassis and fold
it down (Figure 2).
Figure 2.
Cl To remove the Display Unit, slightly loosen
the hex nut affixing the main dial (do not
uyIscrez.u it!) and pull it Off, then remove the 2
screws located underneath (Figure 3).
Cl Gently pull off the VOL, SQL and MEM
knobs, then remove the 4 screws (2-each, top
& bottom) attaching the front Panel to the
display unit Chassis.
Figure 3.
0
0
0
0
0 Remove the wiring connectors from the SQL
and VOL controls on the rear of the Display
Unit.
0 Gently press in the plastic catch which mates
with the tab on the Display Unit circuit board
to release and lower the front Panel (Figure
4).
Figure 4.
Next, using a small flat screwdriver, gently
pry out and remove the wiring connector
from the back of the MEM knob, then remove
the front Panel.
Gently pull the POWER, AlT (2pcs.), NB,
and AGC buttons out from the Panel. Then
remove the spring screw, nylon washer,
threaded brass collar and washer affixing the
rotary encoder shaft to the Chassis.
Remove and the 6 screws aff ixing the Display
Unit circuit board to the Chassis (Figure 5).
Last, carefully remove the three wiring con-
nectors from the bottom edge of the Display
Unit circuit board to free the unit.
Figure 5.
FRGlOO Tedmicd Supplement
~__~_I_s_
_.-_.l..- . -_.______._._- ..“.----- .._.” --.--.. --.
-

Case Disassembly & Circuit Board Access
Pilot Lamp Replacement
Cl Disconnect all cables and remove the top and
bottom covers as previously described.
0 Remove the 2 middle screws from both edges
of the display unit and loosen the 2 lower
screws at the edge of each side.
‘Loosen
0 Locate the Pilot light then pull it out from it’s
grommet, trace the two blue wires leading
from the bulb to TP1005 & TP1006 on the
corner of the circuit board as shown below.
Carefully unsolder these wires to remove the
lamp and resolder the replacement lamp as-
sembly (polarity of the wires is not impor-
tant).
To Change the backup cell, use your fingers
to remove the old cell from it’s holder (do not
grab it with metal tweezers or pliers, as that
could short it out). Replace only with Sony
lithium type CR2032 (Yaesu Part No.
Q900564), or equivalent .
Removing Lithium Ce11
Slide cell inward, then pry up to eject
Inserting Replacement Battery
Pilot Lamp TP1005 & TP1006
Battery replacement
The lithium backup battery tan be re-
placed by removing the bottom cover (as pre-
viously described). Battery location is shown
below.
Slide battery downward through slot, then
inward and release
Resetting the microprocessor
Functional Problems involving frequency,
mode and memory selection tan sometime be
resolved by simply resetting the microproces-
sor. There are two ways to reset the CPU in the
FRG-100, both of which clear the contents of
all memories, leaving them at the factory de-
faults.
Soft Reset
The procedure relies on a ROM routine
which should normally suffice to correct most
operating malfunctions.
0 Turn the receiver Off, then hold the MEM
CLEAR button while switching the receiver
back on. If the Problem still persists, proceed
to the hard reset.
FRGlOO Techmixl Supplement
2-3

Case Disassembly & Circuit Board Access
Hard Reset
D Turn the receiver off, then disconnect the DC
power Source. Turn the BACK UP switch on
the rear Panel to OFF. Reconnect the DC
power Source, then turn the receiver back on.
BACK UP
ON OFF
BACK Ul? SWITCH
2-4
FRGl 00
Technical Supplement

Circuit Description
This description, together with the block
diagram, is intended to provide a general un-
derstanding of the electrical functions of the
circuits of the FRG-100. Such an under-
standing is necessary for troubleshooting the
receiver. Refer to the schematics diagrams and
Parts lists for specific component and wiring
details.
Front-End Stages
Incoming RF from the antenna jack is deliv-
ered to the main unit after passing through a
9:l impedance transformer Tl004 (if Hl-Z an-
tenna is selected using the rear-Panel switch)
and surge suppresser D1005, which removes
high voltage electrostatic pulses which might
otherwise darnage components in the front-
end. It is then low-pass filtered and attenu-
ated (if enabled). The received Signal is then
impedance transformed by transformer
T1018, then band-pass filtered to suppress in-
termodulation by Signals from other bands.
The correct bandpass filter is selected by BCD
control Signals from the PLL unit, and de-
coded by Q1032 (SN74LS145N). The Signal is
then once again impedance transformed by
T1005, before entering the 1st mixer Stage.
._.
The Signal then enters the balanced 1st
mixer, consisting of
Q1009/Q1013
(2SK125X2), along with the 1st local oscillator
output from the local unit (47.260 w 77.210
MHz) which has been amplified by Q1006
(2SC2053), and low-pass filtered by C1014,
L1005, C1013, L1004, and C1012. The result-
ing 47.21 MHz 1st mixer product Passes
through monolithic crystal filters XFlOOl and
XF1002 ( f 20 kHz BW) where other unwanted
mixer products are stripped away to produce
the filtered 1st IF Signal.
IF Stages
The filtered 1st IF Signal is then amplified
,^.
by Q1011(3SK179), and applied to balanced
2nd mixer QlOlO & Q1012 (2SK302x2), which
also receives the 2nd local Signal generated
from 46.775 MHz crystal X2002 and amplified
by QlOO8 (2SC2620), to produce the 455 kHz
2nd IE When FM Operation is selected, a por-
tion of this 455 kHz product of the 2nd mixer
is buff er-amplified by QlO38 and delivered to
the optional FM UNIT-1 00 for detection(when
installed) For other modes, the 455 kHz Signal
is Passes through the noise blanker gate
(D1009, DlOlO & D1014) and is then filtered
by ceramic filters CF1 001, CF1002, or CF1 003
(depending on selected mode) where other
products are stripped away
Final IF amplification is provided by
Ql018, QlO17, and Q1016 (3SK131-V12) be-
fore the Signal is applied to buffer amplifier
Q1016 (3SK131-V12) and then enters detec-
tion circuitry.
For SSB and CW modes, the amplified IF
Signal is applied to the product detector con-
sisting of D1033, D1038, DlO39, and D1040
(lSS198x4). Here, it is mixed with the appro-
priate BFO(carrier) Signal for either LSB, CW
or USB from the DDS unit, having been buff-
ered by Q1028. The detected Signal then
Passes through a LPF consisting of R1129 and
Cl141 before delivery to analog switch Q1023-
4. The Signal enters the active filter Ql026-1,
which functions as a low pass filter for audio
before delivery to analog switch Ql501.
For AM reception, another buffered output
from the 2nd IF is detected by D1032, the
output of which serves as both the detected
AM Signal and AGC. This Signal then Passes
through the LPF formed by R1208 and Cl130
before delivery to analog switch Q1023-3 and
on for audio amplification.
Aud io Amp
lif iers
The low level detected audio in all modes
pass through mute switch Q1023-l(when not
muted by the squelch control lines), and then
buffer amplifier Q1026-2. The Signal Passes
through another mute circuit Q1031 & (21046
(DTC144EK) and is mixed with beeper audio
from the microprocessor having passed
through the LPF and VR1005. The mixed
audio is amplified by Q1034 (TDA2003H) to
drive a 4
w 8 Q loudspeaker or headphone.
The output from Q1034 is controlled by VOL
1 .
FRGI 00
Techm*cal Supplement

Circuit Description
Potentiometer VR3601 located on the VR
Unit. A Sample of the pre-amplified audio @
600 &2 is also delivered to the REC jack on the
rear Panel.
Noise Blanker & AGC Circuit
In the AM, SSB and CW modes, when the
noise blanker is on, a Portion of the 455 kHz
2nd IF Signal is tapped from the output of
T1011, then Passes through noise blanker am-
plifiers 41004 & QlOO5 (3SK131-V12), and de-
tected by D1003 & D1004, then fed back to the
amplifiers Q1004 &’ QlOO5, controlling their
gain. The response time of this loop is de-
signed so that noise pulses detected at D1003
&D1004 produce a strong DC pulse for the
duration of each RF noise pulse. This DC
blanking Signal is returned to the noise blank-
ing gate Controller (D1009, DlOlO & D1014),
switching them off during the noise pulse and
preventing the 2nd IF Signal from reaching
the narrow IF filters while the noise is present.
Receiver AGC is provided for all modes,
with a selectable fast or slow decay. The out-
put Signal from buffer amplifier QlOl9 is rec-
tified by AGC detector D1026 and D1027
(lSS198x2), and then delivered to AGC am-
plifier Q1020 (2SC2712). The Signal is proc-
essed by QlOl5 (2SJ125), then amplified again
by Q1014-1 and delivered to QlOll, QlOl8,
and Q1017 to control amplifier gain, S-meter
and squelch level.
PLL Frequency Synthesizer
The PLL section on the Local Unit consists
of Main Loop, DDS and the 2nd local oscilla-
tor circuitry. The PLL IC Q2030 (CX-7925B)
contains a reference oscillator/divider, serial-
parallel data latch, programmable divider,
and a Phase comparator.
1st Local Signal Generation
The 1st local Signal (47.260 - 77.210 MHz)
is generated by PLL Synthesis under control of
CPU on the Local Unit. In the main loop, one
of VCOs Q2015-Q2018 is activated by the
CPU and selected via Q2040 (M54564P) ac-
cording to the frequency of Operation. The
output of the selected VCO is buffered by
Q2045 (2SK192) and Q2011 (2SC535) before
delivery to mixer Q2012 (uIIX1037H)This sig-
na1 is then mixed with the DDS Signal and
low-pass filtered, buffered by Q2021(2SK192)
and amplified by Q2024 (2SC535) before be-
ing returned to PLL IC Q2030.
In the main divider/phase comparator sec-
tion of PLI, IC, the VCO Signal is divided by
128, according to a control Signal (serial di-
vider programming data) from the CPU to
produce 83. .92 kHz.
This Signal is then applied to the Phase
detector section for Phase-comparison with
the 10.4875 MHz reference Signal from the
OSC UN IT. Any Phase differente between the
two Signal will produce a 5-V pulsed-DC out-
put with pulse duration depending on the
Phase differente. This pulse train is converted
to DC by charge pump 42025 (2SK184) and
Q2023 (2%3732),and low-pass filtered to pro-
duce the varactor control voltage (VCV), and
then is applied to the varactor D2002 - D2005
(lSV103x4) in the selected VCO to Cause the
VCO oscillating frequency to be Phase-locked
to the 10.4875 MHz reference.
The PLL, local Signal for Loop 1 is the prod-
uct of either Loop 1 Local Mixer (Q2012), or
the product of the output of this mixer further
mixed with the 10.4875 crystal reference sig-
nal, according to the band of Operation.
2nd Local Signal Generation
A Portion of 2nd local oscillator Signal
(46.755 MHz), which is derived from
Q2031(2SK:192)/X2002, is delivered to mixer
Q2028 (SN-16913), it also is applied to the 2nd
local amplifier (on the main unit) after attenu-
ation and passing through the LPF formed by
L2023, C21.46 & C2147.
The sampled reference Signal (10.48576
MHz), which is generated by Q2030, is halved
by frequency divider 42032-2. The output
from the divider (5.24288 MHz) is low-pass
filtered, then mixed with the DDS output
(286.16 - 368.07 kHz) in mixer Q2034
(SN1 6913), which is also controlIed by the
MPU. The output from Q2034 is band-pass
filtered (5.57 MHz) by CF2001 before delivery
to mixer Q2028 (SN16913) along with the 2nd
local Signal. The mixer product is band-pass
FRGl 00 Techmkd Supplement

Circuit Description
filtered before amplification by Q2019
(2SC535), and then applied to the mixer of the
main loop Q2012 (uPC1037H) as a sub-loop
Signal.
Although the reference frequency of the
main loop is 81.92 kHz, a 10 Hz receiving
frequency step is obtained by mixing a sub-
loop Signal with the main loop. The VCO is
thus Phase-locked to the reference Signal.
Miscellaneous Con trol Logic
Band selection for the PLL Loop 1 Local
Signal is provided from the CPU by encoder
Q2005 (M14558CP) and switch driver 42040
(M54564P). Whenever either VCO Loop be-
Comes unlocked, and unleck line (from pin 8
of Q2030) controlled by Q2027 (BAlA4P) sig-
nals the CPU, which then mutes receiver
audio and blinks the display until the PLLs
resume leck.
The MPU provides band (BPF) selection on
the Main Unit via latch Q1032(SN74LS145N),
and mode/filter selection using switching
gates Q1023-2-Q1023-4 and Q1054.
Rotary encoded tuning data from the main
dial is processes by dial counter Q2044
(FQ7924), and transferred to the MPU via an
S-bit data bus. Q2041 contains a real-time
clock with reference oscillator crystal.
“V
FRGI 00 Techmkal Supplement

The FRG-100 is carefully designed to allow
the knowledgeable Operator to make nearly
all adjustments for various Station conditions,
modes and Operator preferences simply from
the controls on the front and rear Panels, with-
out having to open the case of the transceiver.
The FRG-100 Operation manual describes
these adjustments, plus certain internal set-
tings.
..-
The following procedures cover the some-
times critical and tedious adjustments that are
not normally required once the transceiver
has left the factory. However, if darnage oc-
curs and some Parts subsequently are re-
placed, realignment may be required. If a
sudden Problem occurs during normal opera-
tion, it is likely due to component failure; re-
alignment should not be done until after the
fault component has been replaced.
We recommend that servicing be per-
formed by authorized Yaesu Service techni-
cians, experienced with the circuitry and fully
equipped for repair and alignment. So, if a
fault is suspected, you should contact the sell-
ing dealer for instructions regarding repair.
Authorized Yaesu Service technicians have
the latest modification information, and re-
align all circuits and make complete perform-
ante Checks to ensure compliance with
factory specifications after replacing faulty
components.
Those who do undertake any of the follow-
ing alignments are cautioned to proceed at
their own risk. Problems caused by unauthor-
ized attempts at realignment are not covered
by the warranty policy. Also, Yaesu must re-
serve the right to change circuits and align-
ment procedures in the interests of improved
Performance, without notifying owners.
,..
Under no circumstances should any align-
ment be attempted unless the normal function
and Operation of the receiver are clearly un-
derstood, the Cause of the malfunction has
been clearly pinpointed and any faulty com-
ponents replaced, and the need for realign-
ment determined to be absolutely necessary.
The following test equipment (and thor-
ough familiarity with it’s correct use) is neces-
sary for complete realignment. Correction of
the Problems caused by misalignment result-
ing from use of improper test equipment is
not covered under the warranty policy. While
most Steps do not require all of the equipment
listed, the interactions of some adjustments
may require that more complex adjustments
be performed afterwards. DO not attempt to
perform only a Single step un less it is clearly
isolated electrically from all other Steps.
Rather, have all test equipment ready before
beginning, and follow all of the Steps in a
section in the Order they are presented.
0 Digital DC Voltmeter
0 RF Millivoltmeter
Cl AF Millivoltmeter
0 RF Standard Signal Generator/calibrated
output and dB scale, 0 dBp=0.5 PV
0 Frequency Counter
0 FM Unit-100
0 SINAD Meter
Alignment Preparations G) Precautions
0
0
0
.
Except where specified otherwise, the re-
ceiver should be tuned to 14.2 MHz, and the
following controls set as indicated;
all buttons off
all knobs fully CCW (minimum)
After completing one Step, read the follow-
mg step to determine whether the same test
equipment will be required. If not, remove the
test equipment before proceeding.
Correct alignment requires that the ambi-
ent temperature be the same as that of the
receiver and test equipment, and that this
temperature be held constant between 20 and
30” C (68 - 88” F). If the receiver is brought into
the shop from hot or cold air it should be
allowed some time for thermal equalization
with the environment before alignment.
Alignments must only be made with the
oscillator shields and circuit boards firmly in
. .
FRGl 00
Techmkd Supplement

Alignment
place. Only one extender board (if optional)
should be installed at a time for access to the
board being aligned. Also, the test equipment
must be thoroughly warmed up before begin-
ning.
Note: Signal levels in dB referred to in
alignment are based on 0 dBp=0.5pV.
Table note: DC voltages should be within
flO% of those listed in the voltage tables.
Local Unit
(1) Ref erence Oscillator
Cl
0
0
Connect the frequency counter to TP2005.
Adjust TC2701 for 10.485760 MHz f 5 Hz.
If the TCXO is installed, tonfirm 10.485760
MHz &5 Hz on the counter.
(2) 2nd Local Oscillator
0
0
0
0
Connect a 50-$2 resistor in parallel with the
frequency counter across the socket J2011.
Adjust T2004 for 46.755 MHz &6OOHz on the
counter.
Replace the counter with the RF millivoltme-
ter, and tonfirm at least 45 mVrms.
Connect the RF millivoltmeter to TMOOl, and
adjust T2001, T2002, and T2003 for maximum
indication (at least 60 mVrms) on the meter.
(3) vco
VCOZ and 2
0 Tune the receiver to 3.999 MHz and select
USB mode.
0 Connect the DC Voltmeter to TP2002 (while
adjusting VCOs, connect the DC Voltmeter to
TP2002)
0 Adjust L2003 for 7.0 & 0.1 V.
0 Confirm the voltage as shown below.
Frequency (MHz)
0.050 Volts DC
0.9 - 1.4
vco3
0 Tune the receiver to 14.499 MHz in USB
mode.
0 Adjust L2005 for 7.0 V ti.l V.
0 Tune the receiver to 8.00 MHz, and tonfirm
1.1 to 1.6 V on the meter.
vco4
0
0
0
Tune the receiver to 21.999 MHz in USB
mode.
Adjust L2006 for 7.0 V fl.1 V.
Tune the receiver to 14.500 MHz, and tonfirm
0.8 to 1.3 Volts on the meter.
vco5
0 Tune the receiver to 30.000 MHz in USB
mode.
0 Adjust L:2007 for 7.0 V rto.1 V.
0 Tune the receiver to 22.000 MHz, and tonfirm
1.4 to 1.9 V on the meter.
Main Unit
(1) 2nd Local Amplifier
0 Connect the RF millivoltmeter to TPl003.
0 Adjust Tl003 on the local unit for maximum
(at least ‘500 mV) on the meter.
(2) IF Werstage Transformer
0
0
0
0
0
Install the FM Unit (Option) to the Main Unit,
and select FM mode.
Connect the RF Signal generator to the an-
tenna jack, and inject an 80 dBp Signal at
14.200 MHz.
Adjust Tl006 through Tl009 for Optimum 12-
dB SINAD (adjust the injection level as neces-
sary).
Turn the modulation switch (of the Signal
generator) Off, and inject an 80 dBp Signal at
14.200 MHz.
Adjust Tl011 through Tl017 and Tl019 in
succession several times for peak S-meter in-
dication. (adjust the injection level as neces-
sary)
(3) IF Gain
0 Inject 6 dBp at 14.200 MHz to the antenna
jack, and tune for peak on the S-meter.
FRGlOO Technical Supplement

Alignment
-_-
0 Adjust VR1002 for S-l deflection.
(4) S-Meter Full-Scale
0 Inject 100 dBp at 14.200 MHz to the antenna
jack, and tune for peak on the S-meter.
0 Adjust Tl001 and Tl002 for minimum volt-
age on the meter (adjust the injection level as
necessary).
(6) SSB Squelch Threshold
0 Adjust VR1001 for S9 +60 dB on the S-meter.
(5) Noise Blanker
0
Cl
With the receiver tuned to 14.200 MHz, press
the NB button.
Inject 40 dBp at 14.200 MHz to the antenna
jack, and connect the DC Voltmeter to
TP1003.
0 In the USB mode, with no Signal at the an-
tenna jack, set the SQL control to the ll-
o’clock Position, and adjust VR1004 so that
the squelch just closes.
(7) Beep Level
0 Set VR1005 to the lO-o’clock position.
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TP1003
Tl002
Tl001
Tl007
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Tl003
Tl013
Tl014
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Tl006
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VR1004
--------VRl005
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Tl019
-Tl015
4-3
FRGl 00 Technical Supplement