That's really weird, because it's all enclosed in a metal box, and the only visible connector is a RCA connector on each end! There doesn't SEEM to be any plethora of tube supply wires, etc..I'll have to look again. R.
On Sun, 18 Feb 2007 22:53:30 -0500, George Sintchak <[EMAIL PROTECTED]> wrote: > The K-8436-A Permakay filter (first generation)was the large sized > 455 kHz unit that was used in the "Sensicon A" series receivers. It > had all miniature tubes. That filter was superceeded with the TU455 > series (smaller size - 2nd generation) 455 kHz filters used in > the "Unichannel G" (and other) series receivers. > George > > --- In [email protected], "Rod Shaner" <[EMAIL PROTECTED]> > wrote: >> >> 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/ >> > > -- 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/
