[Elecraft] K1ZTE - KAT500

[Alan - G4GNX]

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" <k9ztv at socket.net>
To: "elecraft at mailman.qth.net" <elecraft at 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.
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:Elecraft at mailman.qth.net
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html
>Message delivered to g4gnx at g4gnx.com