That didn't fix it. Found this lunchtime with a real antenna:
- Worked OK with case open, testing the idea it was coupling from the 2m
module itself.
- Worked on other mic (SoundMagic earbuds and mic)
- Touching the case with metal made interesting noises on receive.
- HF (20m)
Yes. Headphone to mic distance gets short and feedback can happen from leakage.
Sent from my iPhone
...nr4c. bill
> On Feb 5, 2020, at 10:44 AM, Richard Corfield
> wrote:
>
>
> Even with monitor running into headphones?
>
> I was running the contest with monitor off at first, but I
The metal shield cover on the 2m module was not flat but slightly raised at
the edge. I have pressed this back on and the problem seems cleared. So I
guess it was contacting or coming close to the circuit board on the control
module, perhaps that giving the feedback loop for RF. Question is -
I've done some further tests and proven the problem is with the MH3. So
I'll have to take that apart and look for the problem.
The radio is fine with little earbuds/mic plugged in via splitter cable.
Swap out the mic on the earbuds with the MH3 and leave all the rest the
same and it goes wrong.
Even with monitor running into headphones?
I was running the contest with monitor off at first, but I turned monitor
on only in response to my contact telling me my audio was garbled. That
said, I initially wondered if the garble was due to frequency drift not
feedback. Though if it was a monitor
Turn down TX Monitor volume.
Sent from my iPhone
...nr4c. bill
> On Feb 5, 2020, at 5:23 AM, Richard Corfield
> wrote:
>
> I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
> last night. It seemed intermittent. Result was terrible noise in Monitor
> output (my
I had issues with RF feedback on the MH3 during the UKAC SSB 2m contest
last night. It seemed intermittent. Result was terrible noise in Monitor
output (my headphones) and to the other station, so it affects the audio
input. With experiments at the time and this morning:
- Occurs when RF
7 matches
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