Quote:
Originally Posted by SiriusHardware
Well, I'm starting to run out of ideas now.
Your observations about things which make the problem go away are, I suspect, all instances in which the power radiated is being reduced, either by absorption (ie, your body in close proximity) or by detuning the aerial (adding a length of wire to the end of the aerial) or a combination of both (touching the aerial). The core of the issue seems to be that when the unit is radiating maximum power from its integral antenna, that's when you get the problem.
If you have a spare microphone plug with the right number of pins you could try strapping PTT (mic socket pin 1) to 0V (mic socket pin 4) and just plugging the plug in instead of the speaker / mic- if you get the same noises on TX even then, that will rule out anything to do with pickup in the microphone / microphone cable.
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First & foremost, my sincerest of apologies about not replying here sooner; I've a 3 year old, & 11 Month old Son that are incredibly boisterous & are an handful & often distract me from doing tasks.
Tonight, I eventually got around to doing as you suggested (strapping T to C in attached image) and the rig transmits perfectly.
I couldn't find a DIN plug, so I strapped Transmit to Common with a 1 inch piece of stranded wire, then tried in inch increments upto about 6 inches long - the rig transmitted flawlessly without any need for going near the antenna, connecting extra antenna wire, putting my hand on the battery pack, etc'..
I think we can safely say this has narrowed the fault down to RF pickup via the mic' cable as you rightly pointed out.
Not sure where to go from here?