A technique that works well using a dummy load to adjust a tuner is to
set up a bridge configuration where the dummy load absorbs the power and
the tuner is used to balance the bridge. Once done the dummy load is
switched out and rig drives the tuner. Electric Radio use to sell a
bridge like this that I have used with my Drake amps for years and
really nice way to minimize QRM.
Dave K5MWR
On 11/6/2017 5:52 PM, Don Wilhelm wrote:
Erik,
I don't know the workings of the Icom tuner, but the KAT500 needs 20
watts input to tune. All of that goes to the antenna.
If part of that signal would be shunted to a dummy load, I don't think
it would be tuned to the correct antenna impedance.
I would have to know more about the configuration involved, but to my
mind, it sounds like a dummy load is being connected in parallel with
the antenna which would upset the impedance to be matched.
73,
Don W3FPR
On 11/6/2017 6:37 PM, E T wrote:
I understand the requirements, and the ICOM IC-7300 puts out 12.5W by
default (can be adjusted via service menus). I'm looking for a
definitive answer as to the actual radiated power. Like I said, the
ICOM AH-4 tuner specifies its actual radiated antenna power but the
KAT500 does not so that's why I'm asking.
Thanks and 73,
Erik Tkal - W1QED
On Nov 6, 2017, at 6:29 PM, Don Wilhelm <[email protected]
<mailto:[email protected]>> wrote:
Erik,
The KAT500 relies on the transceiver power being reduced when tuning.
I am not certain how (or if) that happens with an Icom transceiver,
but the KAT500 needs about 20 watts for reliable tuning.
That can happen automatically with the K3/K3S/KPA500 combination, but
I don't know what the Icom can do to accommodate that same thing.
73,
Don W3FPR
On 11/6/2017 5:35 PM, E T wrote:
When tuning using a KAT500 from an ICOM via an AH-4 interface what
is the actual radiated power out the antenna? I was reading that
ICOM's AH-4 tuner itself takes the input power and splits it into an
internal dummy load and only radiates something like 300mW out the
antenna, is the KAT500 comparable?
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
