[Racal] IF out 10.7/21.4 output board availablitity

[Carcia, Francis A HS]

Hi All,
Racal also made 30 KHz. roofing filters if you want to give up a little
dynamic range performance. fc

-----Original Message-----
From: Bob Camp [mailto:ham at cq.nu]
Sent: Tuesday, September 14, 2004 8:20 PM
To: Stephan Walther Larsen; racal at mailman.qth.net
Subject: Re: [Racal] IF out 10.7/21.4 output board availablitity


Hi

As long as you want to run an analyzer that goes +/- 25 KHz from the 
tune frequency an adapter should do pretty well with the 6790.

The problem is that the first IF "roofing" filters would be ahead of 
the adapter output. I don't have the schematic handy but my 
recollection is that they are not much more than +/- 25 KHz wide.

Most of the radios that run well with Panadapters put them in the IF 
ahead of the first narrowband filter.

Now if you build a second high IF and ran it off of a buffered output 
from the first mixer. Then you could run a scan as far as you wanted 
to. That would require significant modification to the radio.

	Take Care!

		Bob Camp
		KB8TQ



On Sep 14, 2004, at 4:12 AM, Stephan Walther Larsen wrote:

> Hi
>
>
> Stumbled over this on Eham-reviews. This is based on a RA6793:
>
> "In mine I discovered that installed in the space reserved for the ISB
> board there is a panoramic adaptor output board, intended for watching
> activity on a wide stretch of spectrum on a scope. The output center
> frequency of this one is 21.4 MHz."
>
> Is such a beast available for the RA6790/GM....if so what would it
> most likely run in USD if found ?
>
> I understand that some parts are interchangeavle between the two
> radios.
>
>
> Im going on and on about this because I ( for the "toy" of it maybe )
> would like to plan how i can use my (soon to arrive ) Spectrum
> Analyzer best. None of my radios has an IF out at 10.7 or 21.4 but one
> has IF out at 45 Mhz. The Arriving Spectrum Analyser/SDU has the
> option of IF in at 10.7 and 21.4 but for the benefit of it allready
> has a realtime SDU 150 Khz wide.
> However ..using the Spectrum Analyser as a tuning tool / measurement
> tool would be sweet. so a range of 10+mhz would also be nice
>
> I would like to use the Spectrum Analyzer as a "panoramic" bandscope
> on occasion
>
> This is not life to me..but im interested in solving my own
> selfcreated problem with some effort/USD invested into it.
> Kind Regards
>
> Stephan in Denmark
> Visit vb.premiumrx.dk for more info.
>
> (I try to Google and I use Copernic Agent before I ask)
> _______________________________________________
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> RACAL at mailman.qth.net
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>

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