[Collins] 51J-5

[G3OOU at aol.com]

In a message dated 16/04/2010 16:01:47 GMT Standard Time,  
collins-request at mailman.qth.net writes:

I forgot  that the 51J has 2 IF's, one for even number steps and one for odd
number  steps.

The VFO is 3-2 MHz.  One IF is 2.5 -1.5 MHz, the other is  3.5-2.5 MHz.
It is using the high side/low side mixing and hence tunes the  same way for
even/odd bands from 4-30 but with the USB/LSB alternating  between even/odd
bands.

That's what I get for not checking the  manual.





Hi All
 
I believe that a similar frequency conversion technique was used by RCA in  
the earlier AR8516L receiver - I have only ever seen one of these in the UK 
and  that was many many years ago.
 
73

Bob

Bob F Burns
Amateur  Radio Callsign: G3OOU
G-QRP Member No: 6907; QRA: IO91WH; WAB: TQ25
Joint  web site with Crystal Palace Radio & Electronics Club: 
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Technical web site: _www.qsl.net/g3oou _ (http://www.qsl.net/g3oou)