[Elecraft] K3 Amplifier Keying

[Paul Christensen]

Phil,

The closest you're going to get to plug-'n'-play amplifier isolation is by 
purchasing a commercial keying buffer, one for each amp and split the K3 key 
line three ways to the input of one of these devices.  The output from each 
device would go to its own amp.  For three devices that's USD $90-$180 
depending on the model + the cost of cables.

http://www.theheathkitshop.com/page13/page13.html

http://www.radiobooks.com/products/svkr.htm

http://www.ameritron.com/Product.php?productid=ARB-704

By contrast, three silicon diodes can be purchased with pocket change and 
can be easily inserted into RCA plugs with just a bit of soldering 
necessary.

Paul, W9AC

----- Original Message ----- 
From: "Phil LaMarche" <plamarc1 at verizon.net>
To: "'Paul Christensen'" <w9ac at arrl.net>; <elecraft at mailman.qth.net>
Sent: Wednesday, December 16, 2009 4:58 PM
Subject: RE: [Elecraft] K3 Amplifier Keying


>
> Wow!  Not being an engineer, I didn't think it would be so difficult. 
> Many
> replies, thank you.  Is something commercially availiable for a non techie
> like me?
>
> Phil
>
>
> Philip LaMarche
> LaMarche Enterprises, Inc.
> www.instantgourmetspices.com
>
> www.w9dvm.com
> 800-395-7795 pin 02
> 727-944-3226
> FAX 727-937-8834
> NASFT 30210
>
> K3  #1605
>
> CCA 98  00827
> CRA 1701
>
> W9DVM
>
>
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Paul Christensen
> Sent: Wednesday, December 16, 2009 4:50 PM
> To: elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 Amplifier Keying
>
> Phil,
>
> You may want to isolate all three key lines using one of the many keying
> buffers available.  At an absolute minimum, consider using three steering
> diodes if only using a splitting RCA jumper cable from the K3 to the amps,
> using one diode (e.g., 1N4007 or if necessary, a Schottky type) for each 
> amp
> key line from the K3 with all the cathodes combined together and pointing
> back to the K3 amp key line.
>
> The ne-plus-ultra solution for selecting one of three amps from one of 
> three
> rigs may be available in the very near future from W8ZR...
>
> http://www.w8zr.com/homebrew/StationPro.htm
>
> Paul, W9AC
>
> ----- Original Message -----
> From: "Phil LaMarche" <plamarc1 at verizon.net>
> To: <elecraft at mailman.qth.net>
> Sent: Wednesday, December 16, 2009 4:28 PM
> Subject: [Elecraft] K3 Amplifier Keying
>
>
>> My K3 will be keying 3 amplifiers....144...50 and HF.  I have two amp
>> keyers
>> that can be used or just one.  Should I find an RCA cable with 3 females
>> and
>> one mail or does anyone have a better suggestion.
>>
>> Thanks
>>
>> Phil
>>
>>
>> Philip LaMarche
>> LaMarche Enterprises, Inc.
>> <http://www.instantgourmetspices.com/> www.instantgourmetspices.com
>>
>> www.w9dvm.com <http://www.w9dvm.com/>
>> 800-395-7795 pin 02
>> 727-944-3226
>> FAX 727-937-8834
>> NASFT 30210
>>
>> K3  #1605
>>
>> CCA 98  00827
>> CRA 1701
>>
>> W9DVM
>>
>>
>>
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