[Elecraft] [K2] T-R Driver Circuit to key KXPA100

[Mark Musick]

Heinz,
This is exactly how Don wired my K2 to key an external amp.
The RCA jack is mounted as Don describes.
It works. What more is there to say?
I forget what the voltage and current ratings are for the 2N7000, but as I remember it will key the majority of amplifiers.

73,
Mark, WB9CIF

-----Original Message-----
From: elecraft-bounces at mailman.qth.net <elecraft-bounces at mailman.qth.net> On Behalf Of Don Wilhelm
Sent: Saturday, January 19, 2019 19:44
To: Heinz Baertschi <heinz.baertschi at bluewin.ch>; elecraft at mailman.qth.net
Subject: Re: [Elecraft] [K2] T-R Driver Circuit to key KXPA100

Heinz,

If you have the K60XV option installed in the K2, yes K60XV J2 pin 2 will key an amplifier like the KXPA100.
The only difficult part is to find a place for a connector on the rear panel.  There is a place near the key jack where you can mount an RCA jack and not interfere with any components on the RF board - keep the jack as close to the top of the lower panel as possible.

73,
Don W3FPR

On 1/19/2019 2:23 PM, Heinz Baertschi wrote:
> 
> What kind of T-R keying circuit is necessary in the K2 (with K60XV installed
> for 60m band usage, no XVTRs connected) to operate the KXPA100 amplifier?
> 
> a) Will the XVTR Keyline on K60XV J2-2 / Q3 (2N7000) do it correctly?
> 
> b) Is a keying circuit like these necessary?
> http://folk.uio.no/sverre/LA3ZA/blog/K2/N0SS/k2_t-r_rly_drvr.pdf
> ftp://ftp.elecraft.com/K2/Mod%20Notes%20Alerts/K2%20Amplifier%20Keying%20Circuit.pdf
> 
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