[Milsurplus] RAX-1 Contract Information

[J. Forster]

The RADAR ELINT receivers have very wide IF bandwidths (MHz). I'm
currently working on a receiver / SPA-1 combination as RADAR is a serious
interest.

Sadly, some of the manuals are pretty scarce.

Best,

-John

========


> On 11/2/2010 10:51 AM, Ray Fantini wrote:
>> The strange 160 volt dynamotors may have been only available from units
>> that may have been field striped, sounds strange but have seen the
>> government do stranger things. Remember that the unit one and three
>> receivers were only a year or two old if they robbed the dynos off them
>> they were for all intents "new" although this is all still just
>> speculation. The more you look into the whole RAX thing the less sense
>> it makes. When it came to liaison radios BC-348 is king.
>
> Well, that is open to debate, I suppose.  My particular favorite is the
> AN/ARR-7 (repackaged SX-28) because of its variable selectivity control
> and same operation as the SX-28 less the bandspread.  It is also
> officially an ELINT receiver, though as I recorded in a previous note,
> they were very scarce until 1945.
>
>> As far as intelligence gathering radios, the APR-1 and APR-4 true ELINT
>> radios. What was the lowest frequency they covered? Thought they went
>> down to around 20 Mc to 100 Mc for the first tuning unit?
>
> The lowest band tuning unit (TN-1/APR-1 and TN-16/APR4) had a range of
> 38 to 95MHz (http://aafradio.org/countermeasures/APR-4.jpg ).  It was
> also primarily designed for radar intercepts, and the amount of noise in
> those high gain cascaded IF amplifiers has to be truly experienced to
> rule it out as a good HF intercept receiver. :-)
>
> 73,
> Mike  KC4TOS
>
>
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