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 Post subject:
PostPosted: Apr Tue 20, 2010 5:38 pm 
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Oz,
You think there's a discriminator issue in these radios?

John


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 Post subject:
PostPosted: Apr Fri 23, 2010 4:57 pm 
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Oz, can you post that part of the schematic?

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PostPosted: Apr Wed 28, 2010 8:04 pm 
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John, and Tim, I can get an FM signal through on 49.5 MHz (from an old FM Walkie Talkie) on Band 8, so the discrimnator is apparently O.K.
I will try to scan and post the tuner section when I get to it.
Interestingly, both these chassis have the same problem (with band 10) and so does the one that sold for over a grand on EPay a couple of months ago. I had printed out the description put on EPay by the seller, and he said that set worked on all bands, except band 10.
The manual gives no info concerning repairs to the tuner module--it says to change it if it's found to be defective. :roll: :roll:
I have found a military case that is similar, though a bit larger than the proper case, so I will have something to put the chassis in. Will take pics and post when I get a round toit. :wink: :wink:

My THIRD PRR-15 purchased in 2017, has the same problem :?:
OOPS too many Smilees again....

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Last edited by OZ132HOME on Sep Tue 19, 2017 5:11 pm, edited 2 times in total.

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 Post subject:
PostPosted: May Wed 19, 2010 4:51 pm 
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Interesting story about how the AN/PRR-15 was used by the USMC for Intel gathering in Nam during "Operation Dewey Canyon." :


https://www.nsa.gov/news-features/decla ... upport.pdf

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Last edited by OZ132HOME on Sep Tue 19, 2017 5:16 pm, edited 1 time in total.

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 Post subject:
PostPosted: May Wed 19, 2010 5:53 pm 
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Oz,
Thanks for the very cool story!
Don't ya just love it when a plan comes together!

John


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 Post subject:
PostPosted: May Thu 20, 2010 4:12 am 
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Attachment:
CaseOpenPRR-15 Compressed to fit AntiQueRadios new requirement.jpg
CaseOpenPRR-15 Compressed to fit AntiQueRadios new requirement.jpg [ 30.07 KiB | Viewed 1281 times ]
Yes! Here's more pics of the first Chassis, restored, in a military case similar to the correct one, but slightly larger. It has room for a battery case and AC power supply:
Attachment:
CaseOpenPRR-15 Compressed to fit AntiQueRadios new requirement.jpg
CaseOpenPRR-15 Compressed to fit AntiQueRadios new requirement.jpg [ 30.07 KiB | Viewed 1281 times ]


Image THANKS SO MUCH, PHOTBUCKET, for holding my pics for Ransom. GOOD LUCK with that! :evil: :evil: :evil:
Image
The Band selector knob is from a Heathkit, the S meter is home-brew, but she works well and I was out on the patio listening to some hams on 40 meters SSB this afternoon. Lot's o fun!!!

The second chassis looks a little better, has the correct knobs and S meter, but needs more work. So the project continues...

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Last edited by OZ132HOME on Sep Tue 19, 2017 4:04 pm, edited 2 times in total.

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 Post subject:
PostPosted: May Thu 20, 2010 1:14 pm 
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So, Oz, did you get band 10 working?

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 Post subject:
PostPosted: May Mon 24, 2010 2:04 pm 
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Still no Band 10 on Either Chassis.
I don't have a signal generator that goes up that high, so I tried an FM BCB Xmitter, but cannot pick up a signal. The FM detector works on 49 MHz, verified with a walkie talkie that works on that frequency. That also proves the front end and 10.7 MHz IF strip are O.K. on Band 9, at least.
Have been reluctant to mess with alignment of Osc and RF stages, but I may just have to try it, while pumping in a signal from my FM BCB Xmitter...
BTW, this Manual is perhaps the worst written Military Manual I've run across. Hard to follow, though it is very detailed...

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PostPosted: May Mon 24, 2010 5:20 pm 
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Have you tried "sniffing" for the oscillator signal with a frequency counter or oscilloscope? It does sound like the oscillator is not working on that band.

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 Post subject:
PostPosted: May Mon 24, 2010 6:21 pm 
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Tim, I'm afraid my frequency counter won't go high enough in frequency, either.

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 Post subject:
PostPosted: May Mon 24, 2010 6:22 pm 
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Here's more info I found on the use of this receiver in Cambodia for SIGINT...
http://www.governmentattic.org/docs/NSA ... 2_1974.pdf

Apparently, Army and "other" intelligence units as well as the USMC used these receivers...

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 Post subject:
PostPosted: May Mon 24, 2010 8:51 pm 
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OZ,
I can loan you one that go's up to 500 mhz. I have two freq counters so it's not a problem.

John


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 Post subject:
PostPosted: Jun Wed 02, 2010 1:54 pm 
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War Bird Radio wrote:
OZ,
I can loan you one that go's up to 500 mhz. I have two freq counters so it's not a problem.

John


John,
A kind and generous offer, indeed. Thank you. But let me try a few more things first...

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 Post subject:
PostPosted: Jun Thu 24, 2010 5:38 pm 
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Well, yesterday I worked on Chassis #2 trying to get an FM BCB signal through on bands 9 (Top end of the band) and Band 10 (bottom end of the dial). If I hook the output of my Ramsey FM broadcaster directly to the antenna input of the receiver, I can blast a strong signal through 0n 88 through 108 MHz.
Hooked to any kind of antenna, nothing I can hear.
Touched up front end alignment on the Antenna and 2 RF trimmers, and that helped a bit, but still nothing via the antenna.
Hooked the ouput of an attic TV/FM antenna with booster to the receiver input, and was able to get one (local) FM station, weak and distorted.
Starting to think the 10.7 MHz IF strip needs alignment...

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 Post subject: prr15
PostPosted: May Fri 13, 2011 3:37 am 
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Used by USMC 1st Radio Bn in Vietnam as intercept receiver around 1970.


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 Post subject: Re: prr15
PostPosted: May Mon 16, 2011 2:53 pm 
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k4sue wrote:
Used by USMC 1st Radio Bn in Vietnam as intercept receiver around 1970.


Thanks Dave. Did you have any hands on with this receiver while in service? Any more info you have greatly appreciated.

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 Post subject: Re: R-1484/PRR-15 Receiver USMC Mystery Solved, Chassis Rest
PostPosted: Jul Tue 30, 2013 5:54 pm 
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Just sitting in the basement. Still looking for the correct case.
Need to drag out one of these and listen on the patio...

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 Post subject: Re: R-1484/PRR-15 Receiver USMC Mystery Solved, Chassis Rest
PostPosted: Jul Mon 17, 2017 3:54 pm 
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Been a while. Just found a complete set on Epay and snatched it up---knowing how rare they are. It's on it's way to me now. Looks to be complete and in pretty good shape.
:D :D http://www.ebay.com/itm/U-S-M-C-ZENITH- ... 2749.l2649

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 Post subject: Re: R-1484/PRR-15 Receiver USMC Mystery Solved, Chassis Rest
PostPosted: Jul Mon 17, 2017 4:21 pm 
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In 8 years, I have seen 4 or 5 of thesae, including the 3 I have. None has a serial number approaching 100. I don't think more than a hundred or two were ever made?

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 Post subject: Re: R-1484/PRR-15 Receiver USMC Mystery Solved, Chassis Rest
PostPosted: Jul Mon 17, 2017 11:53 pm 
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You might want to hit the Preview button before posting to see if the images are showing. Photobucket no longer supports 3rd party linking.

Larry

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