I remember having a similar 6 Volt Tx/Rx version in the mobile. That vintage Xmtr used 807's in the final for 50 Watts output and an AT cut FT243 xtal running at 1.0943 MHz with 48 times multiplication to get adequate deviation of +/-15 kHz. The xtal would rattle in it's holder. (that was normal) It was a MONSTER TVI generator in it's day because it put out "spurs" +/- 1.09 MHz either side of the main carrier for about +/- 5 MHz. They were only down about 20 dB due to the large 48x multiplication and not enough selectivity in the stages to eliminate the unwanted emissions. (There's a story here how I ended up on 6M FM back in ~1961 on 52.525 & 52.640; wow, it's been a long time!)
The receivers (13VA) didn't have the (newer research line) "Permakay" 455 kHz IF filter and the rcvr selectivity was determined by the 1.7 MHz last IF stages. Tubes are mostly "Loctal" types, hard to find today. Not too practical to narrowband these old clunkers. Sad to say, they belong on a shelf in a Museum somewhere. That being said, I'm still using a high band version (16VA) of the same rcvr on 2 Meters as a repeater monitor receiver. The (then) wide band channel spacing was 120 or 240 KHz on high band. The broadcast people liked to use this family of receivers because it has a 600 Ohm audio output winding along with the 4 Ohms for the spkr. They made nice HiFi audio studio link 150 MHz receivers and could feed dedicated phone lines directly. Good luck with your project. You need to find someone who still has one of the infamous "red" or "yellow" Motorola schematic books that Sherman Wolf published in Boston in the late 60's for more info. George, WA2VNV. --- In Repeater-Builder@yahoogroups.com, "rod_shaner" <[EMAIL PROTECTED]> wrote: > > 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. >
