[Premium-Rx] Mackay question - "thumb wheel switch source"

[Rodney Bunt]

Nigel,

Anyone know where I can get any of those "thumbwheel switches"

Rodney
VK2KTZ

--- GandalfG8 at aol.com wrote:

> In a message dated 29/08/2007 22:36:43 GMT Daylight Time,  W9RAN at oneradio.net 
> writes:
> 
> have two  ITT Mackay synthesized general coverage receivers, a model 
> 3020A and a  3021A, the only difference being the tuning method (dial vs  
> thumbwheel-type switches).   Both have the same problem and I've  been 
> unable to nail down the source.   The problem is on USB or  LSB mode (or 
> presumably on CW, although I haven't tried) - the audio will  develop a 
> low-rate "gurgling" sound after a while (it sounds like bad AC  
> modulation).   Usually the audio is fine after power-on, but  develops 
> soon thereafter.  I suspect this is due to some kind of  ripple or 
> component-aging in the PLL but would be interested in any  suggestions
> -------------------------------------------
> Hi Bob
>  
> I've not had any experience of these particular Mackay sets, so  
> unfortunately not able to offer any specific advice, but I do have a pdf copy of  the 
> 3020A manual if you haven't already got one.
>  
> Regards
>  
> Nigel
> GM8PZR



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