[Racal] RA 1792 infos & problems

[rob.j.davies@philips.com]

Hi Carlo,

An incomplete answer:


> First of all, the display has three digits after the dot (8
> digits in total), corresponding  to a  tuning step of 1 Hz and not of 10
> Hz as reported in the manual or in the Oesterman. I discussed with a
> friend of mine (Marco from Naples, another Racal "supporter") and its
> 1792 (about 700 units "older") has the standard display, i.e. two
> digits. 

I'll have to check the serial numbers but both of my RA1792s also tune in 
1Hz steps.  They also tune down to 0Hz.


> Next, my Racal does not have inside the standard IF card at 455
kHz, but rather
> a metallic box with a writing "IF 100 kHz output. 

You will have the standard 455kHz IF - it's the big board visible as you 
lift off the top cover.  The filters on the left may have the frequency 
marked on them.  The circuit inside the box takes the 455kHz auxiliary 
output and downconverts this to 100kHz.  One of my radios has this; the 
other doesn't.  It's easy to restore the 455kHz IF to the back panel, if 
you want to.

> Finally, the BFO
works also in USB and LSB but only between +0 and +8 kHz. 

You should get +/- 8kHz in CW mode.  In normal USB/LSB mode, the BFO 
display shouldn't be on.  On both of mine, if you then select one of the 
(narrow) normal filters, the radio now operates in 'IF shift' mode, in 
which the narrow filter can be shifted from 'f/2' to 8kHz in USB ('-f/2' 
to -8kHz in LSB), where f is the bandwidth of the filter selected.  This 
only operates for those filter positions narrower than the standard 
LSB/USB filters.

What filters do you have?

> So, do you known the procedure to start the BITE test?

can't remember the exact procedure off-hand but it involves the dip 
switches inside the front cover.  Will look it up if nobody else respnds.


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