This isn't a problem with the KX3's SWR detection circuitry. If it is
detecting a high SWR, it's because the KX3 is producing RF output before
the t/r relay has closed and the relay is hot-switching. The SWR
detection is doing its job and protecting the KX3 and the amplifier!
The solution is either to speed up the amplifier's relay or add some
more delay before the start of RF generation after the assertion of PTT
by the KX3, as you say.
On 3/18/2014 8:14 AM, bruce whitney wrote:
Regarding keying another amplifier from the KX3/KXPA100: There is a
problem currently being addressed beyond the (electrical specs of
current and voltage) capacity of the PTT line to key another
amplifier. Currently the KXPA100 cannot be used to key an amplifier
with slow frame relay TR switching. The SWR detection cicuitry in the
KXPA is too fast to allow the external amp (non-QSK) to go to
transmit without tripping out on "ANT FAULT". If you want to drive an
amplifier with non-QSK relaying you will have to use manual PTT to
key the amplifier to transmsit before giving it any RF power. I
understand our Heros at Elecraft are working on incorporating a menu
adjustable timing delay to allow VOX keyng without the ANT FAULT
problem. Bruce W8RA
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco/
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