My OLD  Rev A 2002 K2/100 manual shows it on page 56.  It'll switch 1A, 
+200VDC via an IRF830 (or IRL620)  MOSFET to ground.  It's on the left middle 
of the second page of the schematic. 

Lou W7HV



    On Tuesday, March 16, 2021, 9:23:15 PM MDT, Mike Cizek W0VTT 
<[email protected]> wrote:  
 
 Hello Eric,

It's in theKPA100 manual, at the back under Specifications:

DC relay coil pulled to ground
1A at 200 VDC  (do not use with AC-controlled relay)

P59 in my book, which I just noticed, comes right after p62.....

----
73,
Mike Cizek W0VTT

-----Original Message-----
From: [email protected] <[email protected]> On 
Behalf Of eric norris via Elecraft
Sent: Tuesday, 16 March, 2021 21:11
To: Elecraft Reflector <[email protected]>
Subject: [Elecraft] K2/100 Amp Keying Limits?

Can anyone tell me what the external amplifier keying limits are for a K2/100?  
I'm trying to use an AL811H, which has 14.5V at 10ma on the relay jack.  Do I 
need an external interface?  I cannot find the answer in the K2/100 manual.  
Thanks!

73, Eric WD6DBM

   
  
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