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 <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Repeater-Builder/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
