June 15, 1967 HW-32 Bulletin No: 20M SSB Transceiver HW-32-1D VFO Drift An incorrect shipment of coils has been included in a recent production run of the HW-12, HW-22 & HW-32. The coil Part Number is 52-25 & has a N-750 ceramic installed inside the can...rather than a silver mica. The mis-manufactured coil causes drifting in the circuit...which can be corrected by replacing with a # 52-25 of proper construction. All stock currently on hand in the parts dept is correctly manufactured. ------------------------------------------------------------------------------------------------------------------ April 15, 1968 HW-32 Bulletin No: 20M SSB Transceiver HW-32-2D IF Feedback In Receive Mode R-121 may be changed from 12K ohm to 22K ohm 2W [PN 1-11-2] to stop IF feedback in receive operation. ------------------------------------------------------------------------------------------------------------------- May 8, 1979 HW-32A Bulletin No: 20M SSB Transceiver HW-32-1 Relay Chatter In The VOX Mode While the relay is chattering, monitor the junction of R-200 and C-204 with an oscilloscope. If you see a negative 12-Volt pulse, 4 milliseconds wide, remove C-203. C-203 is intended to "speed-up" the cut-off voltage to V1B when going to the receive mode. However, it is also the cause of the relay chatter. When in the transmit mode, V10 is cut off and V2B is saturated, so that the relay is energized. If no one is speaking into the microphone, V10 will saturate and V2B will cut off. This disconnects pin 1 of the relay from R-203 and sends a negaitve pulse through C-203/R-200, the MIC GAIN Control, C-14 and on to the grid of V10. V10 cuts off, causing V2B to again turn on and re-energize the relay. After a short period, V10 will again saturate, repeating the loop. Remove C-203 on an "AS-NEEDED" basis only. -------------------------------------------------------------------------------------------------------------------- September 29, 1982 HW-32 Bulletin No: 20 Meter SSB Transceiver HW-32-2 Finals Self-Oscillate + + + + Information not available at this time + + + + --------------------------------------------------------------------------------------------------------------------