I was quoting from the KAT500 owners manual and only the min and max
power that the KAT500 will tolerate.
As I just posted, there's a cable made which allows you to use the
external tuner function of the IC-7300, forcing it to output low power
for tuning, but without connecting the IC-7300 to the tuner, except for
the RF connection. That way you know that the IC-7300 is only outputting
its intended tuning power and will protect itself.
73,
Alan. G4GNX
------ Original Message ------
From: "KENT TRIMBLE" <k9...@socket.net>
To: "elecraft@mailman.qth.net" <elecraft@mailman.qth.net>
Sent: 13/09/2020 00:03:34
Subject: Re: [Elecraft] K1ZTE - KAT500
Alan is right, but it depends on which "good book" one is consulting!
We have to be careful about transceiver power levels when tuning an external
AMU, for the sake of the /transceiver /as well as the AMU.
Your AMU may be able to tolerate 100 watts during the tuning process, but your
transceiver may not. Unless the transceiver automatically folds back its
output in the presence of high SWR levels, one risks damaging the transceiver's
PA transistors. While many modern rigs do so, others, especially older rigs
often used by new licensees, do not.
For example, when seeing an SWR above 3:1, my FT-991A reduces its CW output from 100 to
10 watts while at the same time flashing "HIGH SWR" in red letters. The rig
may be successfully protecting itself, but why risk stressing components if it's not
necessary? That's why I prefer switching the transceiver to AM at 25 watts when tuning
an external AMU.
73,
Kent K9ZTV
On 9/12/2020 5:16 PM, Alan - G4GNX wrote:
Although it's preferable to have at least 20W to tune, the good book says that
anything between 7 and 100 watts is OK.
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