[Elecraft] Keying an amp

[W0MU Mike Fatchett]

Ameritron makes a relay the ARB-704 $59.95 that uses rca cables and 12v.  
 
HRO might stock them.  

"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin 

 

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From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Don Nesbitt
Sent: Sunday, February 08, 2009 1:44 PM
To: 'Phil LaMarche'; elecraft at mailman.qth.net
Subject: Re: [Elecraft] Keying an amp



Hi Phil - not sure just what you mean here by "take out the keying device
and direct, it still keys." - but - if it's the Collins 30L-1, the keying
circuit in it presents a negative (-) voltage on the key line - and -
unfortunately - the K3 is set up to key an amplifier that presents a
positive (+) voltage on the "relay" terminal.

 

Wish the K3 presented a menu item so one could switch between negative
keying (older amps) and positive keying but it looks like the MOSFET used
will only key positive voltages.  Because of this, I use a small homebrew
relay box between my K3 and 30L-1.  It's a kluge mess but is the simplest
solution I've found!  73 es gud dxing - Don N4HH K3/100 #83

 

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From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Phil LaMarche
Sent: Sunday, February 08, 2009 12:42 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] Keying an amp

 

Hooking up an amplifier through an amp key to key out.  Is there any menu
that needs to be changed.  Don't see it in the book but when I plug in the
amp it keys.  Take out the keying device and direct, it still keys.  Looking
in book to no avail.

 

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
W9DVM 

 

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