Hello Rod, To set things straight, the radio is NOT an "13V" series as others have said, it is much newer. The radio you have is called a " Research Line, Sensicon Receiver type" radio. The nominal output was 250 watts. The radio is comprised of the following: Receiver: is a PA8633, the number you have is the part # of the RF deck, which is for 40 to 50 Mhz. the receiver uses a type B02 crystal. The high IFis 2.9 mhz, the low is 455 kHz. if the receiver has a 15 kHz bandwidth the Permakay IF filter is a K8436, if it was set for 5khz audio, the filter # is K8435. The exciter is a model PA8691B, the part number you listed is that of the basic unit. The crystal is a type B04, 16 times multiple. The P8066N is a DC line termination panel. this allowed the radio to be remote controlled over a copper phone line, by using a Motorola" DC remote". the squelch control on the panel is just that. the other pot is for the adjustment of the line level, normally set at 0dbm with modulation. The "520" in the model number is the maximum plate input power, in watts. power supply-wise, the small supply with the 5R4 tubes is for the exciter, receiver, and panel lamps. The other, with the mercury vapor tubes id the HV+. Be careful, this can be a killer... I am sure, but to tell you anyway, never put the B+ on without letting the Mercury tubes get warm first, they could explode. There should be 2 interconnect switches in the rear cabinet doors to keep the unit from app;lying B+ and going into transmit with the door open. You should be able to pull the switch plunger OUT a bit and "click" to allow the radio to work with the door open, but be CAREFUL, lots of places with HIGH B+.These PA units were tuned with "hot sticks". a rod made of clear plastic that allowed for the tuning of the plate and antenna couplers with the PA covers on. Any other questions, feel free to contact me. I have serviced many of these.. years ago. Lance Alfieri N2HBA [EMAIL PROTECTED] ----- Original Message ----- From: "Rod Shaner" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, February 19, 2007 8:55 AM Subject: Re: [Repeater-Builder] Re: 1953 Motorola BaseRadio for 6meters
> > All these modules inside the cab are labeled thus: > Final RF amplifier comprised of two PL-254W tubes: > P-8233B > > Exciter: > P-8630-AM2 > this threw me because I thought for a moment it was "AM" not "FM". Not > true, it is FM. > > Receiver: > P08607-AH > incidentally, one of two crystals on receiver is 16.54167 MHz. There is > another one, but it only says something like "3355" very nondiscript, in a > 'pinch' holder, that is to say retained on the chassis by a pinch device. > > Power supply/ transformer chassis with 2ea. 5R4-GY tubes (regulators?) > > Xmit/Receive rotary switch panel: > P-8449B > > Squelch/ Line Input Control---does this control the audio INTO the > exciter? Microphone gain that is?: > P-8066-N > > HV Power supply: > P-8238-C-2 > > I cannot find a receiver model number that looks anything like this. Maybe > there are other places to look. I really don't know about these model > numbers that I have supplied here as to what they mean. I assume "P" > prefix has some global meaning relating to the entire unit. > > The complete model number is: FSTR520BR(FW)1ASP2 > The chassis number underneath the model number is: 1413 > The mfr. date is Oct. 1953. > This is found on the rear, at the top, outside the cabinet. > > > What is the "RED" book, what is the "yellow" book? Can you clue me in. I'm > willing to go to the library of Congress if necessary. > > All Your help(s) is VERY appreciated, > Rod. > > > > On Sun, 18 Feb 2007 23:09:46 -0500, George Sintchak <[EMAIL PROTECTED]> > wrote: > >> As I mentioned in my earlier posting, The last IF is probably 1.7 MHz >> if the receiver model is a FMRU13V(A). A rcvr without the "(A)" in >> the model number was a less selective receiver that (I believe) used >> a higher freq last IF. That may be what you have with the 2.9 MHz >> last IF for low band receiver. NONE of these receivers had any type >> of Permakay filter or a 455 kHz last IF! What is the complete model >> number stamped on the blue front panel of the receiver under the >> Motorola name? You really need one of those "Yellow" schematic books >> I mentioned before. You are really testing my memory on all of >> this.... >> >> George >> >> --- In [email protected], "Rod Shaner" <[EMAIL PROTECTED]> >> wrote: >>> >>> What is the IF for this 1953 Motorola 520BR rig? 2.9MHz?? >>> >>> R. >>> >>> On Sat, 17 Feb 2007 20:09:50 -0500, Eric Lemmon <[EMAIL PROTECTED]> wrote: >>> >>> > www.com-spec.com/narrow.htm >>> >>> >>> >>> -- >>> 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 > > > > 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/
