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

[jmfranke]

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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