Known Issues
This is a list of known issues that builders encounter when assembling and operating their bitx kit.
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PTT "pop"
Description: When closing the PTT switch, a very loud and short "pop" (or "squeal", "click", "screech", etc) comes through the audio output.?
Previous Discussions:
- /g/BITX20/topic/4103578#10952
- /g/BITX20/topic/5842175#31513
- /g/BITX20/topic/5142279#27440
- /g/BITX20/topic/5619768#30672
- /g/BITX20/topic/4460108#25308
- Just search for "PTT" or "PTT pop"
Root cause: ??? Something about the relay not switching fast enough?
Proposed Solutions:
- (partial solution) 1N4148 diode between the transmit supply line and pin 7 of the lm386
- Various PTT mute circuits (see above links)
Low Volume oscillations
Description: At low volume, very loud oscillations occur on the audio output
Previous Discussions:
Root Cause: ??? Something to do with the audio amplifier.
Proposed Solutions:
- Different speakers (4 ohm, 16 ohm, ??)
- Replacement potentiometer
- Removing some SMD parts (?!)
- Trimming wires, twisting wires away from board
- Use shielded cable from board to potentiometer
- Installing capacitor across the?LM386?audio amplifier?
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Template For New Issue
Description: <one sentence description of issue here>
Previous Discussions:
- Links to threads in this group
Root Cause: <one or two sentences describing the cause of the problem, if known>
Proposed Solutions:
- List of proposed solutions
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