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

[J. Forster]

True. However the RDO was not built for airplanes either. So the RDO and
SPA-1 went together on ships and subs and the APR-4 and APA-6A went
together in planes, AFAIK.

-John

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


> The SPA-1 had a steel cover and heavy duty shock mounts and was primarily
> for shipboard systems. The APA-6A was the same except for having an
> aluminum
> cover and lighter shock mounts and was intended for airborne use.
>
> John WA4WDL
>
> --------------------------------------------------
> From: "J. Forster" <jfor at quik.com>
> Sent: Wednesday, March 23, 2011 3:04 PM
> To: "jmfranke" <jmfranke at cox.net>
> Cc: <kgordon2006 at frontier.com>; "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
>
>> 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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>>
>>
>>
>
>