I agree about the MVP audio design. After all, the Custom MVP was GE's economy line radio, so we should not expect it to perform as well as the Mastr II.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, November 26, 2009 9:39 AM To: [email protected] Subject: Re: [Repeater-Builder] MVP Audio Popping At 11/26/2009 07:14, you wrote: >The recent discussion on Spectra audio popping prompts this post. > >Has anyone cured the audio popping on a GE Custom MVP. The speaker pops >every time that the squelch opens. I have several radios that this happens >on, some worse than others. The speaker audio comes from pin 12 of AR901 on the SAS board. The schematic calls out 6.6 V unsquelched & 0.1 V squelched. C921, a 220 uF coupling cap couples the audio to the speaker. Off hand I don't see any way to get rid of the DC step short of replacing/redesigning the audio amp. You could try replacing C921 with a smaller value cap to reduce the low frequency content of the step. Bob NO6B
