My experience is that if they are off by more than 1 uA, then something is wrong or they don't work right.
------ Original Message ------ Received: Fri, 19 Dec 2008 02:11:36 AM PST From: "Bob M." <[email protected]> To: [email protected] Subject: Re: [Repeater-Builder] Micor UHF Receiver > 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 > > > >
