[R-390] R-1247 Nasa Receiver FOR SALE

[Bill Hawkins]

Ben Hall, are you out there?

When this subject came up many years ago, and he was at NASA, I
recall that spacecraft sent back microwave signals, to get tight
beams. The microwave signal was mixed down to something a 390A
could hear. The Manson mods allowed very precise control of the
frequencies used by the 390A for mixing in the RF deck and PTO.

It's possible that the receiver won't work without the external
Manson equipment, but could probably be restored to a normal
390A with a NASA nameplate. Does anybody know?

Precise frequencies were required because the Doppler shift of
the spacecraft signal was used for navigation velocity data,
along with the position in the sky measured by the ground antenna.

If there were multicouplers, they were for redundant 390A sets,
not diversity reception. The sets didn't need Manson for that.

There was a time when I'd have snapped up anything to do with
NASA, but that phase of my life is fortunately over. Now I just
copy Shuttle flights from NASA-TV to DVDs.

Bill Hawkins

-----Original Message-----
From: rbethman
Sent: Thursday, February 25, 2010 12:38 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] R-1247 Nasa Receiver FOR SALE

Dick,

No they didn't fly them.  There were a bunch of changes to these by 
Manson Labs.  There are a bunch of Bnc connectors on the rear panel, 
that allows for a higher level of frequency control and coupling them 
together.

Uncle Sam's methods of "coupling" R-390As was done externally by 
receiver multi-couplers, directed at the diversity aspects.  When you 
start doing HF operations for a Space Program, the diversity antenna 
systems that Uncle Sam used for intercepts no longer would work.

Hence the major mods done by Manson Labs.

Bob - N0DGN

On 2/25/2010 11:09 AM, Richard W. Solomon wrote:
> I have to ask ...
> What mods were done to it for the Apollo Program ? I doubt
> they flew it !!
>
> 73, Dick, W1KSZ
>
>
> -----Original Message-----
>    
>> From: Brian Vietri<bvietri at msn.com>
>> Sent: Feb 24, 2010 10:21 PM
>> To: R390 LIST<r-390 at mailman.qth.net>
>> Subject: [R-390] R-1247 Nasa Receiver FOR SALE
>>
>>
>> This receiver was modified for Apollo Space Program.
>> I have for sale Manson Labs R-1247 s/n 94. This unit is is great
condition, works very well, very clean, has some knob paint wear, top and
bottom covers and balanced antenna adapter. I have installed 600 volt Orange
Caps in IF module, C603 and C606 Rebuilt, Inrush current limiter installed.
(Mfg Motorola R390A s/n 1818, Manson Labs s/n 94)
>> Pictures available upon request.
>> This unit is heavy approx 75 lbs, so it will be PACKED,SHIPPED and
shipped INSURED by UPS. Plz serious inquiries only.....
>> WILL NOT SHIP OUT OF USA
>>
>> Asking $1350.00  OBO + ship + ins
>>
>> Paypal Preferred
>>
>> Contact Brian bvietri at msn.com

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