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/ >
