Yes, the switching time in the amplifier is too slow, hence you need to
consider sequencing the amp keying so that it keys first then the KX3. Sounds
like the amp has a relay vs solid state switching.
Mel, K6KBE
From: EA2BD via Elecraft <elecraft@mailman.qth.net>
To: elecraft@mailman.qth.net
Sent: Thursday, September 29, 2016 9:06 AM
Subject: [Elecraft] KX3 temporary high SWR on PTT with external Amplifier
Hello,
I want to check if anyone experiences the same behaviour when connecting the
KX3 to an external amplifier.
- I receintly added an external amplifier to my KX3.
- I connected the PTT cable to the ACC2 port and to the amplifier.
- I set the Menu ACC2 on the KX3 to Active low, as specified.
- I verified if the cable works and it closes contact all right every time I
key down.
The TROUBLE is:
Everytime I send a dit (CW) or start talking (Voice) the SWR indicator on
the KX3 shows full reading (Hi SWR!) just briefly and it quickly relaxes
down to normal reading (SWR 1:1) during the rest of transmission.
I believe there should be any kind of delay between the TX on the KX3 and
the TX on the ampli, that causes the momentarily Hi SWR reading... But this
is extrange because the PTT cable is in!
Does anyone have experienced similar phaenomena?
Any idea to overcome this?
Do you consider there will be a real overload on the finals due to this
small transient time?
I drive with 2 watt out from the KX3 to get around 90W out from my
Amplifier.
Wait for your feedback, many thanks!
73 de Ignacio EA2BD
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