[[Shows the RF Generator ( set at 5.5mhz) connected to the Marker/Sweep
Generator (set at 4.5 Mhz marker on and Lo Sweep), which is in turn connected to
the O-scope. The Attenuator is connected to the Sweep Generator. ]]
Connect the demodulator probe’s red lead to C402 (lead closest to front of
transceiver); black lead to ground.
Unplug the coax cable from the VFO (LMO) and connect to the attenuator (set to 0
dB).
Set the controls and switches as follows:
RF Generator
Frequency Dial................................5.5 Mhz
Marker Sweep Generator
Marker.......................................ON
Trace...............................................FCW
Sweep Range...................................LO
Unit Under Test
Mic Level........................................FCW
Preselector.......................................FCCW
Key the transmitter and adjust T202 for a wave form similar to the one shown.
[[Base ref line graduated, starting at 4.5mhz - 4.75 - 5.0 - 5.25 - 5.5; Vertical plane is
defined .1V - .2V - .3V. The waveform rises to .2V (TOP TRIMMER)/4.75 Mhz, remains
steady till approximately 5.25 MHz/.3V which indicates (BOTTOM TRIMMER). Trace
then drops back down to .2V where at approximately 5.5 Mhz, (MIDDLE TRIMMER).
[this is just prior to the trace dropping back to the base line]]]
ah.1.61. HW-101-57: Relay Chatter in VOX Mode
JANUARY 21, 1980
HW-101 BULLETIN NO: SSB TRANSCEIVER HW-101-57
This can be caused by the 0 to -50 Volt pulse at pin 9 of V1B when switching from
transmit to receive. This is fed back to the VOX circuit through the MIC control.
HW-101 Service Bulletins Page 151
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