Permakay filters did not have tubes in them, just an in & out. ------ Original Message ------ Received: Mon, 19 Feb 2007 11:37:15 AM CST From: "Rod Shaner" <[EMAIL PROTECTED]> To: [email protected] Subject: Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters
> 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 > > > >
