[Collins] KWM-1 Question

[Dr. Gerald N. Johnson]

As far as I know, you can tell the vintage of a KWM-1 by the serial 
number. Serial numbers weren't randomized for it.

The schematic in my 1959 (2nd ed) yellow book ("Fundamentals of SSB") 
shows the PA Screen switch. Handy for PA neutralization without having 
to dig in to open the screen supply, or for feeding a 62S-1 transverter. 
Which also requires the PA grid jack which is present. The older KWM-1 
may not have that jack, I don't know.

The KWM-2 and 32S have that circuit brought out to two RCA jacks that 
are jumpered internally unless the 62S-1 is connected. Then one has to 
go take out that jumper to let a switch in the transverter switch the 
screen supply.

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

On 4/3/2012 10:37 PM, Gary H. Harmon, Jr. wrote:
> I have two KWM-1 units.  One has a PA SCREEN off-on switch mounted on the PA
> cage.  Is this a late model unit?  I have three manuals and none have this
> switch.  Was there a manual that included this change?
>
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> Thanks.
>
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>
> gary
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>
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> Gary H. Harmon, Jr. - K5JWK
>
> 6003 Archwood
>
> San Antonio, TX 78239-1504
>
> 210.657.1549h / 210.884.6926c
>
>
>
> "Too many projects, not enough time".
>
>
>