[NLRS] Looking for HF gear

[Dr. Gerald N. Johnson]

I'm a technical adviser to the Collins Radio Association
http://www.collinsra.com/ and the head of the group may have some parts 
and units for sale.

The early August Cedar Rapids hamfest had lots of Collins gear. I expect 
the Davenport hamfest a week from Sunday to have quite a bit too. Its at 
the Clarion hotel on North Brady (US61) Nov 1, 8 to noon or so. I might 
be there.

The speaker by itself was a 312B-3 and the housing often held a
516F-2 power supply. A 312B-4 Station Control held a watt meter and
phone patch with the speaker. A 312B-5 held those and an external PTO
for split frequency operation. A relatively expensive accessory even
back then. I made my own power supply for my 32S-1. I bought a new 
75S-3B when I worked at Collins in Cedar Rapids and it spent at least a 
year out of the cabinet on my operating table as
I worked out what I though were bugs and made several modifications that
made it handier and to have a greater tolerance of strong signals. The
original speaker in the cabinet was 5 x 7 oval. The 1964 price list also 
shows a 399C-1 speaker with PTO for the KWM-2.

Barry Beaulow W0IY  barry.buelow at gmail.com has a kit for updating the 
516F-2 with new filter
capacitors, solid state rectifiers, and a power relay to make the power
switch on KWM-2 and 32S-1 mode switch survive eons longer.

> There are some fundamental
> things they S-line and KWM-2 need. First thing is all the black beauty (molded oil
> filled paper capacitors) should be replaced with orange drops because
> they are leaky. The electrolytics are all beyond their useful life.
> The selenium bias rectifiers (one in the receiver, one in the 516F-2)
> should be replaced by silicon. The transmitter power supply should be
> converted to relay line switching to preserve the transmitter mode
> switch. W5USI's KWM-2A book shows how to do that. Many will convert
> the transmitter rectifiers from tubes to solid state and sometimes
> give the transmitter more voltage than it needs. He discusses that
> too.

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



On 10/23/2015 11:09 PM, WA2VOI, Donn wrote:
>
>
> Yesterday, I was asked if I knew of anyone who might have any KWM-2A
>  (Collins) gear. They're trying to complete a restoration. Looking
> for: Speaker (matching speaker) SM-3 (desk mic)
>
> And would like also to find a 16F-2 power supply (mostly as a back-up
>  for the one they have).
>
> Not being an HF'er, I couldn't help them. However, I know a number of
>  NLRS'ers also work HF and might have, or know someone who has, some
> of this stuff.
>
> Any leads would be appreciated, I'm sure.
>
> Thanks.
>
> 73 Donn WA2VOI/0
>
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