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 Post subject: R-1484/PRR-15 Receiver USMC Mystery Solved, Chassis Restored
PostPosted: Sep Tue 29, 2009 2:09 pm 
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Attachment:
PRR-15 Tag.jpg
PRR-15 Tag.jpg [ 109.64 KiB | Viewed 2968 times ]
Made by Zenith. May also be known as AN/PRR-15. Was possibly used for intelligence gathering by USMC? Repeated searches produce precious little info.
Looking for manual, schematic, any info I can find.

Got it pretty cheap on ePay, now need info...

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... K:MEWNX:IT

Image
Image

photobucket has been changed from a very nice, FREE service, into a RACKET, which is holding all my old Pics hostage, until I pay $399 for an "Upgrade". They are now BANDITS.

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Last edited by OZ132HOME on Aug Tue 22, 2017 3:10 pm, edited 6 times in total.

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 Post subject:
PostPosted: Sep Tue 29, 2009 2:40 pm 
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Location: Mt. Airy, Maryland
As I recall it came in a OD green ruggedized case, and the bottom half housed a tape recorder, headphoniums, etc. Never had one, but it looks pretty cool!


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 Post subject:
PostPosted: Sep Tue 29, 2009 5:24 pm 
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The Bryant and Cones books on Zenith show a very similar model housed in a fiberglass case, meant to be mounted on a pack board. But it looks slightly different, and has a different number.
Will continue looking for Manual and/or schematics...

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 Post subject:
PostPosted: Sep Tue 29, 2009 9:03 pm 
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Is it solid state or hollow state?
Is there some kind of read out, LED , NIXI?

Looks pretty cool!

John


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 Post subject:
PostPosted: Sep Wed 30, 2009 7:47 pm 
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Haven't gotten it yet, but I'm thinking Solid State, as the similar one in the Bryant and Cones Book, as well as a third very similar model in Norman Smith's book Zenith Transistor Radios Evolution of a Classic were supposedly based on the Zenith TransOceanic Royal 1000 or Royal 3000. Pictures in these two books are quite similar, but knob and meter placement are each a bit different. Each has a different type of readout--the one in the Bryant and Cones book looks identical to a TransOceanic R1000 in the picture. Mine looks like it must have LED's or Nixies or something. Will see when I get it.
The curved top and straight bottom of the face plate on all 3l appear to be made for placement within a suitcase-style case, with room at the bottom for a tape recorder or other equipment.
Bryant and Cones refer to it as Zenith's "ZX-5 Receiving System"
Smith also refers to a ZX-5 in Zenith's Annual Report for 1964 that stated : "The ZX-5 Man Pack, (descendant of Trans-Oceanic portable radio) has been tested in desert and jungle." Smith goes on to say "The military redesignated the ZX-5 radio as military radio number PR-15. The United States Marine Corps took delivery of 100 radios from Zenith. This radio had continuous frequency coverage tunable from 550 Khz to 280 Mhz....."
The radio I bought, as I says looks very similar, but a little different from either of these, and has a plate identifying it as R-1484/PRR-15(Z). None of these numbers produces much info on Google or other search engines. So my research continues...
I would post the Pics from the other models here, by Bryant and Cones or Smith may not like it, and they have copyrights?

Anyway, R-1484 or PRR-15 or PR-15 or ZX-5, none of these are listed under the usual Miliatry Lists, Bama has nothing, don't know where to look...

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Last edited by OZ132HOME on Oct Thu 01, 2009 4:16 am, edited 1 time in total.

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 Post subject:
PostPosted: Oct Thu 01, 2009 12:00 am 
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A side by side operating comparison with an R- 392 would be interesting.....

I like the looks of that rig! Looks like it could go anywhere.

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 Post subject:
PostPosted: Oct Thu 01, 2009 4:17 am 
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If I can get it fired up, I will do just such a comparison....

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 Post subject:
PostPosted: Oct Sat 03, 2009 9:02 pm 
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Frequency Readout is Mechanical, like on a Tube Tester:
Image
Image
No clue how to power it up...

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Last edited by OZ132HOME on Oct Sun 04, 2009 3:56 am, edited 1 time in total.

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 Post subject:
PostPosted: Oct Sun 04, 2009 3:47 am 
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Location: La Porte, IN, USA
The guy I bought it from has no paperwork.
Nowhere on the set can I find it identified as "Zenith" yet the seller identified it as such and the similarity of numbers, description and actual pictures in the books pretty much confirms it as such.
There are several loose disconnected/and or broken wires to identify.
Most important, it is definitely transistors, but circa 1964, I can't figure out if power is positive or negative ground.
So the first step is to figure out how to power it up--safely--and see what if anything works.
Any ideas?

Image

Image

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 Post subject:
PostPosted: Oct Sun 04, 2009 7:03 pm 
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Attachment:
FilterModPRR15a.JPG
FilterModPRR15a.JPG [ 52.57 KiB | Viewed 2924 times ]
Is this two mechanical Filters? Inside a module with selector switch for "Wide" and "Narrow".

Wonder if it's 455 Kc?

Image

Xtals in Xtal Calibrator?
Image


"Hot" leads going to On Off Switch are Red and Red/White. Black leads are connected to chassis. I know It takes 12 Volts DC. Can I assume it's Negative Ground? Can I assume anything???

This is going to be a big, difficult project.

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Last edited by OZ132HOME on Aug Thu 24, 2017 9:24 pm, edited 1 time in total.

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 Post subject:
PostPosted: Oct Sun 04, 2009 7:30 pm 
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First, see what types of transistors it takes; NPN or PNP. If they are PNP, the positive terminal of the battery will feed the emitter circuits.
If they are NPN, the positive will feed the collector circuits.
You'll have to do a little circuit tracing.

Nice find; there can't be too many of those around.

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 Post subject:
PostPosted: Oct Sun 04, 2009 7:42 pm 
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I would expect a conservative design from the mid-1960's to include a series diode to protect the unit against reverse power polarity..... do you see any sign of a big diode in series with the power switch ?

--Chuck


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 Post subject:
PostPosted: Oct Sun 04, 2009 10:30 pm 
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Location: Monterey California USA
The filters are Clevite and I think they are ceramic.

This looks like yet another political pork barrel project from the LBJ era designed to keep a region's defense industry employed during a slow time. The MITE teletypewriter was a classic example.
A lot of these sets were made in very small quantities and often never deployed for actual service with our military, instead being given out to foreign militaries such as Mexico, Iran (back then,) South Vietnam, South Korea and so forth. That might explain why any data is proving elusive.

Perhaps you might head over to distinguised colleague Dave Ross' website ("Real Radios have Motors") at

http://www.hypertools.com/

and inquire whether he has heard of it, although as I write this, that site seems to be down...

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 Post subject:
PostPosted: Oct Sun 04, 2009 10:49 pm 
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N7RHU wrote:
I would expect a conservative design from the mid-1960's to include a series diode to protect the unit against reverse power polarity..... do you see any sign of a big diode in series with the power switch ?

--Chuck

\
Still looking...

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 Post subject:
PostPosted: Oct Mon 05, 2009 2:42 am 
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"Hot" leads going to On Off Switch are Red and Red/White. Black leads are connected to chassis. I know It takes 12 Volts DC. Can I assume it's Negative Ground? Can I assume anything???"

It looks like late '60s to '70s construction and components. I've only seen and worked on one model of solid state radio gear that had positive ground but that was designed in 1964 by . That and the fact it uses red leads to the On/Off SW and black to Gnd, it's safe to conclude it's Neg Gnd. Construction looks similar to my Harris RF-301 of the same era.


John


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 Post subject:
PostPosted: Oct Mon 05, 2009 4:56 am 
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Look for some electrolytic capacitors and see which end goes to ground. If the positive end goes to ground, it's a positive ground radio. And vice-versa.


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 Post subject:
PostPosted: Oct Mon 05, 2009 9:48 pm 
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w3jn wrote:
Look for some electrolytic capacitors and see which end goes to ground. If the positive end goes to ground, it's a positive ground radio. And vice-versa.

Why didn't I think of that...

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 Post subject:
PostPosted: Oct Mon 05, 2009 10:08 pm 
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I knew that. :roll:


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 Post subject:
PostPosted: Oct Tue 06, 2009 11:40 pm 
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Powered it up this evening. Hooked up the B+ from a variable voltage regulated supply to the red wire on power switch. Hooked up 200 Ohm phones to the phone jack and got a nice rushing sound from the Audio amp. accidentally found a line level audio wire (broken off from a multi-conductor plug) and when touched it gives a nice loud hum.. Audio amp works O.K. Hooray!!

Tried injecting 455 Kc from a signal generator various different places (inputs to modules that look like they may be IF). No response. Tried varying this frequency. Still no response. Several discoed wires still hanging loose and unidentified.
This is really a challenge, with no schematic or knowledge of the circuit. Everything is in little module tin boxes, hooked together with plugs and jacks. Nothing labelled as to function.
It's going to be mighty slow going with no manual or schematic.
Quite a challenge.
Is it worth it?
[/i]

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 Post subject:
PostPosted: Oct Tue 06, 2009 11:43 pm 
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Geoff Fors wrote:
T

Perhaps you might head over to distinguised colleague Dave Ross' website ("Real Radios have Motors") at

http://www.hypertools.com/

and inquire whether he has heard of it, although as I write this, that site seems to be down...


Can't get this link to work...

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