[Collins] re zener diode mod to kwm-2 pto

[Dr. Gerald N. Johnson]

You haven't read what we've posted? That manual is available from the 
CCA on line. The zener change is listed as #11B on the schematic 
described on page 7-6 of section seven. KWM-2-2A-_9th-ed-01-78-_Sec7.pdf 
along with about another 50 modifications. About a 4.6 MB download.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association

On 1/28/2011 11:02 AM, Fern wrote:
>
>
>      Since I haven't been able to find any information re the zener diode mod
> to correct a shift in frequency between transmit and receive on a collins
> kwm-2, last night I contacted Dennis Brothers about that and here's what he
> told me.
>     The fix for that will appear in a late manual of January 1978 Rev 1.
> Apparently, there never were any service bulletins to show that fix so it's
> a case of having this late manual. Along with that Collins had a fix for the
> xtal oscillator circuit V13 which should also be shown in the same manual.
>    Since I don't have that late a manual, I would appreciate if anyone could
> scan those two portions of the schematic especially the one to do with the
> zener in the pto circuit so that I can properly repair this kwm-2 that I
> working on now. Or I would be interested in purchasing a complete manual
> issued Jan 1978 Rev 1 please. The shift between transmit and recieve is
> enough that I'm told that I'm off frequency which is quite anoying.
>     73 from Fern   VE7GZ
>
>