[Premium-Rx] R1451A

[Clemens Ostergaard]

Michael, there will be real experts on the list, but until they chime in: I
believe the receiver, which contains lots of CEI modules, was used in
airplanes too. During the Vietnam war, the system called Waterboy, a number
of ground controlled interception sites of the Tactical Air Comman,
directed fighter planes (in a system originally developed in WW2 Britain).
This receiver was employed in that connection. Also sometimes referred to
as a countermeasures receiver (?) perhaps in connection with radar.

It certainly also looks as if it might have been employed in small
submarines or other craft.

And Happy New year,

Clemens

Aarhus, Denmark

On Tue, Jan 1, 2013 at 12:41 PM, Michael O'Beirne <michaelob666 at ntlworld.com
> wrote:

> Dear Bill
>
> I have looked at the only reference on the net to this set.  A distinct
> physical resemblance to the Telefunken e893 submarine radio.
>
> What was of concern was the 40dB aerial attenuator switch.  Such high
> attenuation inevitably suggests that the signal handling range was limited
> - as one expects with early transistorised receivers.
>
> Do you know which parts of the USN used it?  The compact size suggests
> perhaps for submarines or small warships, given that the large warships
> were happy to accommodate a battery of big heavy R390As.
>
> 73s
> Michael
> G8MOB
>
> ----- Original Message ----- From: "Bill Tweedie" <
> bill.tweedie at bigpond.com>
> To: <Premium-Rx at mailman.qth.net>
> Sent: Tuesday, January 01, 2013 3:18 AM
> Subject: [Premium-Rx] R1451A
>
>
>
>  Hi All
>> For those who are interested-
>> This set appears to differ somewhat from the VLF version.
>> Single conversion fron 0.5 MHz to 8 MHz with 455 KHz IF with filters from
>> 0.1KHZ TO 16 KHZ.
>> Double conversion from 8 MHz to 32 MHz. First IF is 3.455MHz ( incl a
>> 'roofing filter' at 3.455MHz)
>> then 455 KHz through 455KHz filters to selectable AM and product
>> detectors.
>> Has an ISB facility with two mechanical filters, one for each sideband in
>> addition to the above filters.
>> Has a fixed 455KHz BFO plus a variable facility from -8 KHz to +8 KHz.
>> FET front end with two RF stages & attenuator.  Extensive shielding
>> section by section.
>> It is likely that oscillator radiation was minimal fro obvious reasons.
>> AGC & manual controls. Construction is a work of art.  Circuit boards are
>> Would have cost a fortune to produce in the 1960s.
>> Bill
>>
>
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