Hello WA6KLA??? It seems like this would be a good time for Neil Mckie to jump in & give advice here. No one knows more about the old useless Moto gear!
------ Original Message ------ Received: Sun, 18 Feb 2007 02:43:03 PM CST From: "Rod Shaner" <[EMAIL PROTECTED]> To: [email protected] Subject: Re: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters > How about this: > Filter number on I.F. is K-8436-A. Possibly K-6436-A (hard to resolve > whether it's an eight or a six.) > > Another idea: > How about using enough preamps that the selectivity is increased and > sensitivity (spread) is decreased? > As I understand it, the receiver is too broadbanded at present by a factor > of 3. > > R. > > On Sat, 17 Feb 2007 17:50:09 -0500, Dick <[EMAIL PROTECTED]> wrote: > > > If memory serves, that radio is old enough to be a wideband rig (+/- 15 > > KHz > > FM deviation). You can turn down the XMTR FM dev to +/- 5 KHz, but your > > receiver's bandwidth is more complex to narrow it down to +/- 5 KHz. As > > it > > is now, you're nowhere near filling up its RCV bandwidth, so the > > remaining > > RCVR bandwidth lets noise through. There used to be some parts around > > that you could replace in the RCVR to narrowband (+/- 5 KHz), but I > > suspect they'd be nearly impossible to find now. You might be better off > > digging up a more modern RCVR and using it. > > > > 73, > > > > Dick > > > > ----- Original Message ----- > > From: "rod_shaner" <[EMAIL PROTECTED]> > > To: <[email protected]> > > Sent: 17 February, 2007 11:29 > > Subject: [Repeater-Builder] 1953 Motorola BaseRadio for 6meters > > > > > >> Hi all, > >> I'm seeking schematics, manuals, and advice on peaking a working > >> unit. Its model number is FSTR520BR(FW)1ASP2. Just tearing that model > >> number apart is a workload! > >> It was a commercial base radio, and it's crystalled for 52.525 FM. > >> Right now I'm trying to get as much as possible out of the receiver. > >> It works, but 25 mile away 40W signal radiated through a vertical > >> antenna is just out of the noise on this end. My receive antenna's > >> base is 30 inches off the ground for test purposes. > >> > >> Advice is requested. > >> > >> Thanks. > > > > -- > Using Opera's revolutionary e-mail client: http://www.opera.com/mail/ > > > > > > Yahoo! Groups Links > > > >
