Re: Shrill noise on power up !!
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I had to replace the volume pot a week after receiving the BITX40. After a week of use I found the pot was becoming intermittent.
73
Ken VA3ABN
On Sun, Jan 29, 2017 at 8:57 AM, Sourav <sourav.relja@...> wrote: No John...my pwr supply is an Alinco DM330FX. No mic feedback & ptt also well connected.
I guess the vol ctrl on/off pot is faulty...will replace to see if still the problem persists !!
73
Sourav- Vu3Cgb
-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of John Backo via Groups.Io
Sent: 29 January 2017 05:49 AM
To: [email protected]
Subject: Re: [BITX20] Shrill noise on power up !!
Audio feedback?
If I were to guess, I would say that your power supply is not stout enough. Put an indicator LED at the power supply and see if it dims or flickers during transmit. If so, you need a heavier power supply.
Another possibility is feedback in the microphone circuit during power-up. Probably the same solution or perhaps isolation. Is there feedback when the mic is held close to the speaker during receive? That would indicate a poor PTT connection. See if the switch is flaky.
john
AD5YE
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