[Premium-Rx] [Milsurplus] R1451A/WLR-6 - One More Time

[Terry O']

I'd like to see the same schematics as well as the schematics for the 
display and the LO it measures and a the block diagram for the whole radio.

The Sylvania Electronic Design Laboratory was funded by the Signal Corps 
to produce cutting edge designs.  I'll never own an R-1414 or R-1451 (or 
the earlier R-1440) but I am trying to trace the evolution of radio 
circuit design during the Cold War and these were key pieces of 
equipment in the progression.

Terry O'
watkins-johnson at terryo.org
http://Watkins-Johnson.terryo.org
http://BlackRadios.terryo.org
Facebook:   BlackRadios & BlackRadioSwap



On 7/7/2019 5:02 PM, Al Klase wrote:
> Hi John,
>
> If you can scan the schematics for the first three (from the antenna) 
> front-end boards, it would be worth a look.
>
> VY 73,
> Al
>
> On 7/7/2019 5:29 PM, w3jn at verizon.net wrote:
>> Al, Sylvania made the R-1414 and R-1451 about the same time period 
>> and there are definite similarities, including the bandswitch shaft 
>> going through the boards.
>>
>> Not sure how similar the RF boards are, but I do have the R-1414 
>> manual (huge) but I could scan a few pages.
>>
>>
>> -----Original Message-----
>> From: Al Klase <ark at ar88.net>
>> To: premium-rx <premium-rx at mailman.qth.net>
>> Sent: Sun, Jul 7, 2019 3:54 pm
>> Subject: Re: [Premium-Rx] [Milsurplus] R1451A/WLR-6 - One More Time
>>
>> Gang,
>>
>> Thank you to everyone who weighed in on this. I must say I'm amazed at
>> how many of these are in captivity.  I'll host any documents that show
>> up on my site, and maybe even do some scanning if the Jersey Boys come
>> through with paper.
>>
>> I made some progress on my set.  See:
>> http://www.ar88.net/pix/R-1451A/Troubleshooting%20A1%20-%20RF%20Head.png
>>
>> So I'm really in need of, at least, the RF No. 1 board schematic. Has
>> anyone been inside one of these.  I'm assuming step one is to disconnect
>> the shaft coupler between the front panel and the band switch. Then get
>> the module out of the radio, pull the shaft, and extract the board.
>> (There's a tool for that included.)
>>
>> VY 73,
>> Al
>>
>> On 7/7/2019 2:35 PM, John Watkins wrote:
>> > I think I have some of those dual gate FETs somewhere, going through
>> > all of those treasures and will let you know if I find them.
>> >
>> > John WD5ENU
>> >
>> > On Sun, Jul 7, 2019 at 09:54 Al Klase <ark at ar88.net 
>> <mailto:ark at ar88.net>
>> > <mailto:ark at ar88.net <mailto:ark at ar88.net>>> wrote:
>> >
>> >    Gang,
>> >
>> >    Is there any documentation on this receiver
>> > <http://www.roveroresearch.info/home/boatanchor-radios/r-1451>
>> >    beyond what comes up on Google?
>> >
>> >    I got this RX in 2001, and it worked pretty well, kind of a
>> >    solid-state SP-600 with a nixie tube readout.  Now, it still
>> >    tunes, but is profoundly deaf.  It hears stations at about 0 dBm.
>> >
>> >    I do have a module-interconnect diagram that's better than
>> >    nothing.  Let me know if you'd like a copy.  (It's a shame these
>> >    lists aren't opened up to support reasonable sized attachments.  I
>> >    can tell the moderator how to do this if he's interested.)
>> >
>> >    Regards,
>> >    Al
>> >
>> >    --
>> >    Al Klase – N3FRQ
>> >    Jersey City, NJ
>> > http://www.skywaves.ar88.net/
>> >
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>> -- 
>> Al Klase – N3FRQ
>> Jersey City, NJ
>> http://www.skywaves.ar88.net/
>>
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