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 [[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

Heathkit HW-101 Troubleshooting

Other manuals for Heathkit HW-101