[Racal] IF out on a RA6790/GM

[Dan Rae]

Stephan,
The standard RA6790/GM only has a 455 kHz IF output, with a bandwidth 
determined by the IF filter in use.  There are convertors available to 
change this to 100 kHz (and other lower frequencies)  if required.

There are modified 6790 first mixer boards that have a splitter and an 
output at the first IF of 40.455 MHz, and there are convertors to change 
this to 21.4 MHz for use with Racal Spectral Display Units, but the 
bandwidth is still limited by the first IF filter, normally 20 KHz.  
These come up on the online auction place from time to time.   The Racal 
SDUs need a pretty big signal to function, Racal receivers that have 
this output have a fair bit of gain in the path, and they are really 
designed for VHF / UHF use, the bandwidths are not suitable for HF use 
anyway.

I have never seen any 10.7 MHz output units for either the RA6790/GM or 
the UK RA1792.  The optional panadaptor units that were made for the 
1792 give a broadband IF output at 455 kHz. 

Regards
Dan
ac6ao / g3ncr

Stephan Walther Larsen wrote:

>Seaching for answers..still searching..
>
>Does Racal RA6790/GM has 10,7 Mhz IF unmodified out.
>
>I want to use one of my radios with a Bandscope Unit i will purchase
>in the near future.
>
>Im at work and such limited access to my manuals.
>
>
>it seems that my Racal is my most likely candidate since my Winradio
>313 with 45mhz IF out cant be used....
>
>(see Moe's response here
>http://www.rfspace.com/forum/viewtopic.php?t=42
>
>)
>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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