[Collins] Art Collins and Collins Radio

[Dr. Gerald N. Johnson]

Had they thought about it there was a better solution. Move the carrier 
and filter of the KWS-1 from 250 to 455 kHz and use the PTO from the 
75A-4 and crystals from the 75A-4. Would have to readjust the tuning 
rack tracking driving by the PTO shaft and modify the 250 kHz tuned 
circuits to 455 by reducing the tuning C or shunting the coils with 
smaller coils. Easier to have been done as a factory change than a ham 
modification in the field. Which is what they did in the S-line where 
they planned for transceive operation.

On 7/7/2014 10:15 AM, Carl wrote:
> I tried building that converter at National and even the engineers
> couldnt get it working worth a damn. It was full of mixer products and
> other birdies that required a spectrum analyzer to identify which wasnt
> something at your usual small ham company.

Mixers always provide those engineering opportunities and trying to 
cover a MHz at 3 MHz demands tracking filters or there will be many spurs.

73, Jerry, K0CQ, Technical Adviser to the Collins Radio Association.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "David Thompson"
> <thompson at mindspring.com>
> To: <collins at mailman.qth.net>
> Sent: Sunday, July 06, 2014 10:01 PM
> Subject: Re: [Collins] Art Collins and Collins Radio
>
>
>> I forgot to include that Mac, W2NSA had a P&H VFO Matic which let the
>> 75A4 transceive with the kWS-1. He told Art in a phone call about this
>> and Art assigned an engineer to make his new gear (the S line) do the
>> same thing.
>>
>> There was an article in CQ about 1964 or 5 that built a complete
>> VFOmatic.
>>
>> Frank Lester, W2AMJ was hired by Hammarlund in 1955. He found there
>> was not a single ham on the hammarlund staff. Frank went to work to
>> fix that with the approval of Lloyd Hammarlund. Over the next few
>> years several ex P&H engineers were hired including the engineer who
>> designed the VFOmatic. Lloyd made a management decision not to make a
>> transceiver but to work with KW Electronics in the UK and Swan to make
>> one. The HXQ 300 made it to prototype and was advertised in the 1964
>> WRL Catalog. Lloyd pulled the plug but Frank did include transceive in
>> one model of the HX-50.
>>
>> 73 Dave K4JRB
>>
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>
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