[Premium-Rx] Racal RA6790/GM improvements

[Steve Stutman]

Hi,

If we're going to morph from Prem-RX to Prem SpecAn, might I suggest a 
low noise preamp in front of one's digitrash soundcard; works well. Fun 
to meditate while listening to Schumann resonance.

At the risk of stirring up the nest, It isn't clear to me what 
advantages accrue in trying to operate RF at baseband audio. Maybe the 
tweakers with the OFHPC wire and "choice" dielectric in their  caps 
should upconvert all their tube-based vinyl and digital audio to K-band?

73,
Steve




Ben Dover wrote:

> Hi.
> 
> I'm the dude who wrote that review on EHAM.
> 
> My pet beast is set up for the 10 KHz low end. I've never actually SEEN a 1
> KHz
> version of the rig, but found out about it's existance from Racal literature.
> 
> Gary W. has been selling the LF / VLF EPROMS for some time now.
> 
> Finding some of the parts for more scarce options is a matter of pure luck;
> there weren't many copies of them made to begin with, mainly because they
> weren't
> needed by anybody except for VERY specialized purposes.
> 
> As far as the ELF options (below 10 KHz) are concerned; I doubt that there's 
> much of a market for them, simply because there's nothing much in the range of
> 1 - 10 KHz except natural radio phenomenon...   and there are much better (and
> much CHEAPER) ways of dealing with that.
> 
> Below 1 KHz there are things of interest, but as far as I know there wasn't a
> version of the rig ever produced for that; receivers going that low tend to
> get
> into completely different design philosophies from the RA6790.
> 
> The ISB option is of interest to some of us, but I'd count the market as
> rather
> small.
> 
> Re. the RF amplifier option, I found that the RF amp from the RA1792 is just
> about identical mechanically, and a spot on match electrically. I managed to
> get hold of one for my RA6793 on EBAY, before the prices on them went insane.
> 
> The panadaptor output board...   who knows? There are other ways of doing that
> trick that are easier than getting hold of the "proper" board.
> 
> 
> 73's,
> 
> 
> Tom, W9LBB
>  
> 
> 
> 
> At 02:50 PM 3/2/2005 EST, you wrote:
> 
>>A few days back there was a discussion on improvements to the Racal
> 
> RA6790/GM.
> 
>>I suggested we post all that information somewhere. Did anything come of
>>that ?
>>
>>Yesterday I found something really interesting at
>>http://www.eham.net/reviews/detail/488  
>>
>>It seems there was a VLF/ ELF version of the 6790 that actually tuned down
>>to 1kHz. 
>>It had the famous VLF version of the EPROM's, a different first mixer and
>>a few other differences from the "standard" 6790. Anyone have any
>>information on this ?
>>Better yet, does anyone have the goodies to convert a " standard" 5790 to
>>VLF/ELF that they would part with ? I sure would like to get at least one
>>of my 6790's to tune down to 1kHz. 
>>
>>Last question for today. Would there be any interest in reproductions of
>>some of the options that were available for the Racal RA6790/GM ? Such as
>>the optional RF amplifier, the A5 ISB board, the spectrum analyzer output
>>board, the VLF/ELF option etc. I have a small company that might be able to
>>do that if there is enough interest. It ain't gonna happen next week but
>>maybe by mid summer. It is a ( sometimes ) for profit company. I did the
>>ReCap kits for the R-390A through the company for a couple years. The total
>>profits from that venture bought a case and a half of Guinness Stout. The
>>profit margin will have to be a tad higher this time, say, two cases of
>>Guinness per month minimum.
>>Anyone interested ?
>>
>>Kindest regards,
>>Dave
>>
>>    
>>    
>>    
>>
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> 
> 
> 
> 
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