Any RF horse race is a bad choice. I prefer to do the simple sequence
switching. A single relay that is keyed by the PTT line with one set
switching the loop off and the Tx antenna ON and the other set of NO contacts
on that relay keys the KX3 and Amp. I built a little TR cast AL box that has
the KX3 mike plugged into it and a short cable with the 4 conductor cable to
the KX3. The box has the cable from each antenna and the plugged into it. I
use a 12 VDC jumper into the box to supply the relay . Simple DPDT crystal can
relay on a perf board is enough to handle a couple of hundred HF watts. The
third RF cable goes the the output of the KXPA100. I love KISS,
Mel, K6KBE
From: Don Wilhelm <[email protected]>
To: Jim GM <[email protected]>; Elecraft <[email protected]>
Sent: Saturday, November 22, 2014 12:55 PM
Subject: Re: [Elecraft] 160M Receive and Transmit Antenna Switching help
Jim,
Since the KX3/KXPA100 combination has no RX ANT input, you will have to
devise some kind of external T/R switching to connect the receiving loop
during non-transmit times.
There is a PA Keying output from the KXPA100 that you could use to
activate the T/R switch for transmit times.
If you use a relay, it must be fast enough to avoid hot-switching or you
will be seeing the KXPA100 go into a fault condition.
73,
Don W3FPR
On 11/22/2014 1:59 PM, Jim GM wrote:
> I have a KX3 and KXPA100. I want to put up a receiving loop antenna for
> 160M and transmit with my short marconi 160M antenna. What do I need to do
> to accomplish this?
>
> Switching things the way they are now takes too long and too many
> operations so I pretty much gave up on the project.
>
>
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