[Elecraft] KX3 To SB1000 Amplifier

[Michael Walker]

David

If the Amp keying line requires less than what the radio is able to
managed, you are good to go.

KX2 = 30v @100ma
Amp is 12V - current unknown

So, you can simply measure this just by plugging in the amp and using a
multimeter to measure the current being used by the relay.  You don't need
any RF hooked up to the amp as you are not driving it.

Take your meter in current mode and have one lead on ground and the other
to the center connector of the amp PTT lead.  You will hear a click when
the amp relay goes into transmit.  Measure the current on your meter and
make sure it is less than 100ma.

If it isn't you will require another relay to key the amp.

900 other people will tell you to install a commercial MFJ amp keying
 buffer.  :)  It won't be required if you draw less than 100ma.  Save your
money.  hi hi

I hope that helps.  It is all in the math.

Mike va3mw


On Tue, Nov 29, 2016 at 3:13 PM, David N. via Elecraft <
elecraft at mailman.qth.net> wrote:

>  Hello AllI just ordered a New KX3 (Kit)I am wanting to know if Keying My
> Heathkit SB1000 (Ameritron AL80A)  amplifier with key line off of the ACC2
> will be a problemIt says that it is good for 30v @ 100ma. My Amplifier is
> 12v relay. Not sure current. I would think itwould be fine. But just wanted
> to check. I won't be able to order my KXPA100 till next year. Have to save
> the penny's for that one.Thanks
> David KR4OWK2/100 4320
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