Bill,
While it is true what you said, the KAT500 or ATU in the KPA1500 will
generally do a good job.
The tuner should be "trained" to the antenna(s) in AUTO and then placed
in MAN for operation.
That will prevent the ATU from attempting to tune when it falsely
detects a high SWR - usually only happens with SSB operation, or
frequency sensing of a frequency where the ATU has not been "trained" to
store the L/C values appropriate to the antenna selected.
73,
Don W3FPR
On 11/29/2018 9:16 PM, Bill Johnson wrote:
And a poor antenna system cannot be "fixed" by any a antenna tuner,
especially an automatic one. Good luck turning manually. Even AI
cannot fix Imbecilic antennas!
73,
Bill
K9YEQ
------------------------------------------------------------------------
*From:* Eric Swartz - WA6HHQ, Elecraft <e...@elecraft.com>
*Sent:* Thursday, November 29, 2018 4:09:05 PM
*To:* Victor Rosenthal 4X6GP; Bill Johnson; donw...@embarqmail.com;
Elecraft Reflector
*Subject:* Re: [Elecraft] Wish I had a KAT1500
Folks - If the untuned SWR presented to the KAT500 is above 3:1 or so
at a KW and above, it will automatically go into bypass to protect its
components.
Eric
/elecraft.com/
On 11/27/2018 12:15 PM, Victor Rosenthal 4X6GP wrote:
I would worry about exceeding voltage ratings on capacitors even if
it was pre-tuned. I believe in judiciously exceeding ratings of
conservatively rated devices, but this doesn't seem "judicious!"
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
CWops no. 5
http://www.qsl.net/k2vco/
On 27/11/2018 21:53, Bill Johnson wrote:
If you manually tune at low power first, then there should rarely be
an issue. Frequency hopping with the segments memorized should
yield good results as well. If there are changes in the antenna due
to wind, moisture, reaction to other materials, etc., then one can
expect the tuning to need adjustment even if recently tuned.
As you probably know, there is more to tuning than just an SWR
reading. I do not hesitate running my KPA1500 into 1.7 to 1 as
indicated on my W2 without retuning.
73, Bill K9YEQ
https://wrj-tech.com/
-----Original Message----- From: elecraft-boun...@mailman.qth.net
<elecraft-boun...@mailman.qth.net> On Behalf Of Victor Rosenthal
4X6GP Sent: Tuesday, November 27, 2018 1:43 PM To:
donw...@embarqmail.com; Elecraft Reflector
<elecraft@mailman.qth.net> Subject: Re: [Elecraft] Wish I had a
KAT1500
My somewhat unique antenna system presents SWRs up to about 8:1 on
some bands, so this would be kind of limiting.
73, Victor, 4X6GP Rehovot, Israel Formerly K2VCO CWops no. 5
http://www.qsl.net/k2vco/ On 27/11/2018 18:39, Don Wilhelm wrote:
Vic,
>From what I have heard, the KAT500 will handle 1500 watts, but at
an SWR of only 3:1 - that is the same as the ATU in the KPA1500 can
handle. At lower power (its rated power of 500 watts) the KPA500
will tune a 10:1 SWR.
73, Don W3FPR
On 11/27/2018 10:32 AM, Victor Rosenthal 4X6GP wrote:
I am using an older Palstar AT-Auto automatic tuner. It has a
coil and capacitor operated by stepper motors. When it works,
it's fine; but it requires a lot of maintenance and fiddling.
What I need is something that works as well as the KAT3 in my K3;
quick, trouble-free, and good for a 10:1 SWR on HF.
Oh yes, it has to handle 1.5 kW, too.
If Elecraft would beef up the KAT500 to meet the above specs, I'd
buy one.
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