The AH-4 inserts an internal 16 dB attenuator between the radio and the
tuner network during the tuning mode. After the match is resolved the
attenuator is switched out of the signal path. This assures the radio
will always see a near 50 ohm load.
73
Bob, K4TAX
On 11/6/2017 7:52 PM, Ken K6MR wrote:
Must be some magic going on in the AH-4. It specifies “Tuning power required:
5-15 watts”. Would be interesting to know where the other 14.7 watts is
going. I’m pretty sure the KAT-500 doesn’t have anything like that.
The other thing you can do with the KAT-500 is specify when a tune sequence is
initiated. I set mine for 1.9:1. If the SWR is less than that nothing
happens. Allows for some variance in the antennas due to weather conditions.
You can still initiate a tune if you want to manually, but it won’t do it on
its own. The amps are happy below that so no reason to tune.
Ken K6MR
________________________________
From: E T <etks...@gmail.com>
Sent: Monday, November 6, 2017 5:28:16 PM
To: Ken K6MR
Cc: elecraft@mailman.qth.net
Subject: Re: [Elecraft] KAT500 actual radiated power during tuning
I know the training process, have done it many times on all my tuners, the KX3
and KX2 built-in, KXPA100, also an MFJ-993B and KAT500. And no, I currently do
not have the K3 and the cables to transmit band switching. But even after
training I find that all of these will occasionally perform a full tuning cycle
even when close to a programmed frequency.
So of course given that my antenna is stable I *shouldn’t* need to do a full
tune yet there it is. The tuner behavior is out of my control if it decides to
perform a full cycle when I press the tune button after a band or range switch.
My point is that the AH-4 specs say:
- 0.3 W RADIATED POWER
- Radiated power during tuning is less than 0.3 W, minimizing interference
to other stations.
I’m just asking if the KAT500 has similar capabilities.
Erik W1QED
On Nov 6, 2017, at 8:08 PM, Ken K6MR
<k...@outlook.com<mailto:k...@outlook.com>> wrote:
Assuming your antennas are stable, you should only need to go through the tune
process once. The KAT500 will remember the proper settings for each frequency
segment (see the manual for the size of the segments on each band) and will
instantly return to those values at the first hint of rf. So spend some time
training the tuner on each band and you don’t have to worry about interference.
Once it is trained you can just find a frequency and start transmitting. No
tune cycle required.
I note you don’t have a K3, but if you did the tuner would automagically follow
the transceiver and switch values without any rf at all.
Ken K6MR
________________________________
From: elecraft-boun...@mailman.qth.net<mailto:elecraft-boun...@mailman.qth.net>
<elecraft-boun...@mailman.qth.net<mailto:elecraft-boun...@mailman.qth.net>> on behalf of E T
<etks...@gmail.com<mailto:etks...@gmail.com>>
Sent: Monday, November 6, 2017 4:52:17 PM
To: Fred Jensen
Cc: elecraft@mailman.qth.net<mailto:elecraft@mailman.qth.net>
Subject: Re: [Elecraft] KAT500 actual radiated power during tuning
I can get and hook up a power meter, still looking for a definitive answer
maybe from Wayne and Eric. If it puts out the full tuning power that is going
into it (e.g. 10-20W) then I want to shift away from any signals I’m trying to
tune to (rude to step on conversations), but if it’s using a low power like a
RigExpert that would most likely not interfere then you get better accuracy…
Erik W1QED
On Nov 6, 2017, at 7:26 PM, Fred Jensen
<k6...@foothill.net<mailto:k6...@foothill.net>> wrote:
My KAT500 [when I still had it] put out variable power levels while it was
tuning. When it was tuned, it put out the TUNE power [25 W] into the antenna.
More than once, someone called QRZ? after tuning in a clear spot. They
probably saw my little signal on a fairly dead band on a panadapter. Is that
what you were asking for?
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 11/6/2017 3:37 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
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