[Collins] re zener diode mod re pto on kwm2

[Dutch Maurer WB7DYW]

I have the exact instructions for that mod for the KWM-2 with before and after pictures and also have the resistors and diode's it is a very simple mod and effective...

73's Dutch WB7DYW
CCA Member #918

Success is not a place in time, it is an attitude…

--- On Thu, 1/27/11, Al Parker <anchor at ec.rr.com> wrote:


From: Al Parker <anchor at ec.rr.com>
Subject: Re: [Collins] re zener diode mod re pto on kwm2
To: geraldj at weather.net
Cc: collins at mailman.qth.net
Date: Thursday, January 27, 2011, 12:07 PM


Hi Folks,
    This mod was also written up in The Signal, CCA newsletter, in 4th qtr 
2001.  I was pointed to that a few months ago by K5LYN, as he noted my 
"new" KWM-2 had the problem.  This writeup doesn't use the added choke & 
capacitors that Jerry's ref. does, but it works OK for me.  It removes 
R131, puts the zener essentially in it's place, and then uses a 470/1/2w 
resistor from the zener to the PTO.
73,
Al, W8UT
www.boatanchors.org
www.hammarlund.info

"There is nothing -- absolutely nothing -- half so much
worth doing as simply messing about in boats"
Ratty, to Mole

On 1/27/2011 11:48 AM, Dr. Gerald N. Johnson wrote:
> Is the PTO supply voltage or the shift voltage? or the BFO shifting.
> ASAB1004 talks about some capacitor changes in the BFO to make it more
> stable.
>
> The PTO regulation mod is posted at:
> http://www.angelfire.com/de/vk3kcm/drift.html which says it was in SB11B
> which
> isn't on the usual site.
>
> 73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association
>
> On 1/27/2011 9:43 AM, Fern wrote:
>>
>>
>>      I've finally fired up my latest kwm-2 acquisition. However, I've got a
>> problem where the transmit and receive frequency is off enough that I need
>> to do the mod to stabilize the voltage to the pto with a zener diode. I've
>> done a google search for this without any results. Any help with this would
>> be greatly appreciated.
>>      73 from Fern
>>
>>
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