[Elecraft] K3 and AL-811 amplifier interfacing...

[VK7JB]

Hi Todd,

Tnx for your note. I've removed the ARB704 interface and all is well. I've fingers crossed that the pulse canceling diode remains healthy. When I posted my question, I'd had trouble finding the specs on the K3 keying circuit in the manual - they're there, but couldn't find them!. I felt happy when I found it's so robust. 

Thanks for your interest. 
73
John VK7JB

On 08/09/2012, at 1:48, "Todd - k1tm [via Elecraft]" <ml-node+s365791n7562241h65 at n2.nabble.com> wrote:

> The AL-811 manual states that "Relay:  keys amplifier when grounded.  Sources +12 VDC open  
> circuit and supplies 100mA when grounded.  A built-in pulse canceling diode protects the exciter. " 
> 
> The K3 is pretty robust "KEY OUT (RCA/Phono) is the amplifier T-R relay keying output, capable of keying up to +200VDC @ 5A."  The relay coils back emf is contained by the diode across it. 
> 
> So, no issues switching the AL-811.  5A's and 200Vdc withstand voltage, beats 100ma and an applied 12Vdc source all day long. 
> 
> 73 
> 
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