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

[jmfranke]

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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>
>
>