Some of them don't idle exactly at zero. I've got a low-band strip that idles at 3-4uA. If you've gone through the full alignment procedure, including adjustment of the discriminator and IF stages with a strong on-frequency IF signal, that's all you can do. Component tolerances and crystal frequencies are throwing it off just a bit.
Bob M. ====== --- On Thu, 12/18/08, mike <[email protected]> wrote: > From: mike <[email protected]> > Subject: [Repeater-Builder] Micor UHF Receiver > To: [email protected] > Date: Thursday, December 18, 2008, 9:19 PM > I looked in the files section but didn't see anything > about the > discriminator circuit. > The receiver I'am working on is an unmodified Micor UHF > 450-470mhz. I > have had the channel element recrystaled by ICM for > 455.xxx. After > going through the alignment. I tried to adjusted the > discriminator to 0 > by shorting the AFC circuit as discribed in the manual. I > can bring > discriminator to zero but after removing the short it > drifts up to 1 on > the meter. It sounds okay and the receiver sensitivity is > within > factory specs. > I don't understand why the discriminator drifts up > after tuning it. > Any info on this would be helpful > Thanks and Happy holidays to everyone > Mike
