[ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners

[J. Forster]

And, more importantly, the SPA-1 special purpose oscilloscope to measure
PRF and Piulse Width.

-John

===============


> The large Navy receiver was the RDO with its equally large RDP 30 MHz
> panadaptor with a 5" crt. The second airborne receiver was the APR-4. I
> have
> tuning units going up to 4000 MHz (TN-54).
>
> John WA4WDL
>
> --------------------------------------------------
> From: "Kenneth G. Gordon" <kgordon2006 at frontier.com>
> Sent: Wednesday, March 23, 2011 2:42 PM
> To: "Roy Morgan" <k1lky at earthlink.net>; "ARC-5 List"
> <arc5 at mailman.qth.net>
> Subject: Re: [ARC5] TN 1B/APR-1 and TN 2B/APR-1 Military Radio Tuners
>
>> On 23 Mar 2011 at 2:52, Roy Morgan wrote:
>>
>>> > I just picked up the subject military radio tuners (1 ea.) that use
>>> > acorn tubes.   Does anyone out there need these?  They are in pretty
>>> >  good condition.
>>
>> Those units were used in at least three different pieces of equipment,
>> all
>> of
>> which were search receivers for a very wide frequency range to detect
>> radar
>> sets of the enemy.
>>
>> The Navy had a very large such unit (I have forgotten the Rxx number),
>> built
>> by Scott, of which I have two examples.
>>
>> There were also at least two airborne versions, the APR-1 being one of
>> those.
>>
>> These tuning units will work in all of the above receivers.
>>
>> I have at least one of each of the tuning units, some NIB, that tune
>> from
>> about 20 Mhz through at least 1000 Mhz. I don't remember the upper
>> limits
>> for sure, although I think it MAY have been as high as 10,000 Mhz.
>>
>> The UHF versions used diode mixers and no RF amp.
>>
>> Some were motor tuned.
>>
>> They are all beautifully built.
>>
>> Ken W7EKB
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>
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