Servicing
VHF Automatic Final Protection (AFP)
0
Disconnect the dummy load from the an
tenna connector.
0
Key the transmitter and adjust VR103 on
the 144-MHz PA Unit for 5 A on the DC
supply ammeter.
0
Reconnect the dummy load, and connect
the DC voltmeter to the lead of C140 nearest
VR103 (adjusted above).
0
Key the transmitter and adjust VR101 for
minimum voltage on the voltmeter.
UHF Automatic Final Protection (AFP)
0
Disconnect the dummy load from the an
tenna connector.
0
Key the transmitter and adjust VR1002 on
the Main Unit for 5 A on the DC supply
ammeter.
0
Reconnect the dummy load, and connect
the DC voltmeter to the cathode of D1003
on the Main Unit.
0
Key the transmitter and adjust VRl 001 for
minimum voltage on the voltmeter.
VHF Transmitter Deviation
0
While tuned to the center of the band, adjust
the
AF
generator attenuator for 50-m V out
put at 1 kHz to the
MIC
jack
0
Key the transmitter and adjust VR1006 on
the Main Unit for ± 4.5 kHz deviation on the
deviation meter.
0
Reduce the
AF
injection until the deviation
meter shows ± 3.5 kHz deviation, and con
firm that the injection level is 4 to 6 m V.
UHF Transmitter Deviation
0
Perform the above steps for VHF, adjusting
VR1007 on the Main Unit.
Receivers
Set up the test equipment as shown here for
receiver alignment.
VHF Interstage Transformers
0
Tune the transceiver and
RF
signal gener
ator to the center of the VHF band. Modu
late the
RF
signal generator with ± 3.5 kHz
deviation of a 1-kHz tone.
FT- 5100
Technical Supplement
0
Ad just Tl 001 through Tl 007 on the Main
Unit for optimum maximum S-meter indi
cation.
0
Confirm
-8
dBµ or better 12-dB SINAD at
the high and low band edges.
UHF Front End BPF
0
Retune the transceiver and signal generator
to the center of the UHF band, and perform
the above (VHF) steps, adjusting only TC-
1003 on the Main Unit for optimum 12-dB
SIN AD.
VHF Squlech Preset
0
Tune to the center of the VHF band, and
inject -15-dBµ
RF
modulated with
�
3.5-
kHz deviation of a 1-kHz tone to the an
tenna connector.
0
Set the SQL control to the 10-o'clock posi
tion, and adjust VR401 on the IF Unit so the
squelch just closes.
UHF Squlech Preset
0
Retune the transceiver and RF signal gener
ator to the center of the UHF band, and with
the same injection level and modulation as
for VHF, adjust VR402 so the squelch just
closes.
VHF S-Meter Calibration
0
At the center of the VHF band, inject 25-dBµ
RF
modulated with ± 3.5 kHz deviation of a
RF Signal
13.BV
DC
Generator
Power Supply
Speaker or
4-ohm load
resistor
SINAD Meter
Oscilloscope
AF
Milivoltmeter
Receiver Alignment Setup
2-3
Summary of Contents for FT-5100
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