[ICOM] IC761 problem

[Frank A. Ellis]

Hi Alan,

Greetings from the hot northern hemisphere! The Logic Unit drives the digital display (via the Display Unit) as well as controlling the PLL. The IC-761 frequency display is not an "RF" frequency counter for the PLL, rather it is simply an indication of what the Logic Unit is "commanding" the PLL to do. The PLL could be completely dead, and the display could continue to display correctly. This is a bit simplified, but an accurate description of the overall scheme. It is virtually identical to the IC-751A. Hope this helps in your efforts.

73, Frank W3UHF



On Aug 18, 2010, at 7:54 PM, zl3kr wrote:

> Thanks Robert... yes the display is working perfectly and also the "S" meter
> so that -5v suppply must be intact, so will go to the PLL and hope that 
> is where the problem is.
> If it is then obviously the display does not source itself from the PLL 
> oscillators, thats the thing I wasnt sure about.
> Yes Clete into our last month of winter here now, but I think we get off 
> much lighter than you
> do in PA as we only see snow about maybe once to possibly twice in a 
> winter and then not much more than a
> couple of inches on the ground. Being only about 100 feet above sea 
> level probably helps there too, lol.
> Alan ZL3KR
> 
> ----
> Your Moderator: Dick Flanagan K7VC: icom-owner at mailman.qth.net
> Icom Users Net: Sundays, 1700Z, 14.316 MHz
> Icom FAQ: http://www.qsl.net/icom/
> To support QSL/QTH.net: http://www.qsl.net/donate.html

73, Frank A. Ellis, W3UHF