Re: Click on xmit keying of mike
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Ron,
Farhan mentioned this during his interview with Tom, .?
He felt it was due to the cap C114 around the audio preamp Q16, holding the amp on for a bit when that rig is switched into transmit. I wouldn't be surprised that C110 might also be holding U1 on as well.
He thought about placing a transistor across the cap to discharge it when going into transmit. Drive the transistor from the xmit?voltage.
I have a very large audio transient on my rig when switching between receive and transmit. I even hear a bit of my own transmit audio for about 1 second when switching into transmit out of the speaker.
I haven't gotten around to digging out the scope yet to see what is going with C114 and C110. Maybe others have looked into this.
Everyone, please keep experimenting and reporting,
Randy, K7AGE
On Thu, Jan 26, 2017 at 10:03 AM, <r.rking41@...> wrote: ?It's not the relay. It's rally loud. ? ? On 01/25/17, ron van doremalen<ronvandoremalen@hotmail.com> wrote:? Ralph,
You mean the click of the relay¡¯s or the delay in going into tx? The first is as it is, the last is also something I need to work at. Did not time it exactly but could be half a second¡reducing the uF caps around the AF Amp might give some resolution as it might keep the audio on to long due to extensive capacity.
Keep us posted on your experiments please.
Ron ¨C PA3FAT
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