[Premium-Rx] Unusual RA1792

[GandalfG8 at aol.com]

Hi All
 
I guess this is more a question for Racal enthusiasts in the UK but any  
response would be much appreciated.
Racal supplied a batch of RA1792s to Portishead Radio, possibly over  several 
years, that had a USB filter fitted and five other symmetrical  filters 
between 0.1 and 2 KHz. No wider filters were fitted. The 100Hz filter  was crystal, 
all others were Collins mechanical. These were relatively early  sets, 
without backlighting or BITE, but seem to have only come onto the surplus  market 
over the last few years.
So far I've come into contact with four of these receivers, which  leads me 
to believe there's probably plenty more about.
Of those four, two had a hand written label adjacent to the antenna socket  
stating that the "aerial mod" had been carried out and quoting a date in 1983.  
Perhaps all these sets originally carried this label?
I had a chance to check over one of these quite thoroughly and could  not 
find anything to indicate a hardware mod, certainly the RF amplifier  seemed as 
normal and was not bypassed.
The original owner of this set was under the impression that it was  less 
sensitive than expected but initial measurements didn't seem  to confirm this.
Unfortunately, it died completely before tests could progress very far,  
tantalum failure being the prime suspect, and it's at present in  storage and 
unlikely to be repaired for some time.
If anyone has any information I would be most interested to know what this  
was all about.
regards
Nigel Clarke
G8PZR

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