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KX2, is the ATU activated when you key the mic?

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usmcss

KX2, is the ATU activated when you key the mic?

Hey guys,

Just got my KX2, I thought when you keyed the mic and the ATU was set to
Auto it would Tune the Antenna?

I was just operating it and the swr meter was off the chart on 10 meters. I
had been operating the radio a few times before I noticed the swr meter was
high. Hoping I didn’t mess anything up, from what I’ve read I haven’t? I
have an antenna analyzer and the swr for 10 meters was at 4:1 so I’m
thinking that wasn’t high enough to cause harm.

Anyway once I noticed the high swr I clicked the ATU button and the Tuner
kicked in and tuned up perfect.

I could swear The radio tuned itself when I would jet the mic. I know that
the tune is memorized.

Any input would be awesome!

Thank you!!!

Semper Fi,

Bob
KD9BPO

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Don Wilhelm

Re: KX2, is the ATU activated when you key the mic?

Bob,

The KAT500 and the tuner in the KPA1500 will do that, but other ATUs
will not. You have the use the ATU TUNE button for it to tune.

AUTO means the ATU will automatically set the L/C combination that was
remembered from the previous tuning parameters that had been remembered
when you change bands/band segments. In other words, you only have to
do an ATU TUNE once on each band segment (unless you change antennas).

73,
Don W3FPR

On 7/5/2018 3:54 PM, usmcss wrote:

> Hey guys,
>
> Just got my KX2, I thought when you keyed the mic and the ATU was set to
> Auto it would Tune the Antenna?
>
> I was just operating it and the swr meter was off the chart on 10 meters. I
> had been operating the radio a few times before I noticed the swr meter was
> high. Hoping I didn’t mess anything up, from what I’ve read I haven’t? I
> have an antenna analyzer and the swr for 10 meters was at 4:1 so I’m
> thinking that wasn’t high enough to cause harm.
>
> Anyway once I noticed the high swr I clicked the ATU button and the Tuner
> kicked in and tuned up perfect.
>

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usmcss

Re: KX2, is the ATU activated when you key the mic?

In reply to this post by usmcss

Hey Don, thanks a lot buddy!!! So I ran it all yesterday and today without
the radio being tuned to the Antenna! I only tried to make a few contacts
but one I tried for a good 5 minutes. The Antenna measured by an antenna
analyzer was around 4:1 you think I did any damage?

Thanks again Don!

--
Sent from: http://elecraft.365791.n2.nabble.com/
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rich hurd WC3T

Re: KX2, is the ATU activated when you key the mic?

From Reflections III by W2DU: "Second, in the Navy Navigational Satellite
(NAVSAT), which is used for precise position indi- cations for ships at
sea, the antenna terminal impedance at 150 MHz is 10.5 – j48 ohms, for an
SWR of 9.3, reflected power 65%. Also matched at the input to the feed
line, the matched-line attenu- ation is 0.25 dB, and the additional loss
from SWR is 0.79 dB, for a total system loss of 1.04 dB. This equates to
approximately one-sixth of an S unit. This is an insignificant amount of
loss for this sit- uation, even in a space environment where power is at a
premium."

The title of the chapter is "Too low an SWR can kill you."

On Thu, Jul 5, 2018 at 19:08 usmcss <[hidden email]> wrote:

> Hey Don, thanks a lot buddy!!! So I ran it all yesterday and today without
> the radio being tuned to the Antenna! I only tried to make a few contacts
> but one I tried for a good 5 minutes. The Antenna measured by an antenna
> analyzer was around 4:1 you think I did any damage?
>
> Thanks again Don!
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>

--
72,
Rich Hurd / WC3T / DMR: 3142737
PA Army MARS, Northampton County RACES, EPA-ARRL Public Information Officer
for Scouting
Latitude: 40.761621 Longitude: -75.288988 (40°45.68' N 75°17.33' W) Grid:
*FN20is*
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usmcss

Re: KX2, is the ATU activated when you key the mic?

Thank you Rich! So my understand that from this info I can say that no harm
was done because in the scenario the swr was 9.3:1

Thanks!

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rich hurd WC3T

Re: KX2, is the ATU activated when you key the mic?

There's a lot to consider in a transmission line system, and SWR is only a
small piece. I think that given Elecraft's design conservatism, the rig
would have self-protected if there was a risk of letting the magic smoke
out.

On Fri, Jul 6, 2018 at 00:04 usmcss <[hidden email]> wrote:

> Thank you Rich! So my understand that from this info I can say that no harm
> was done because in the scenario the swr was 9.3:1
>
> Thanks!
>
>
>
> --
> Sent from: http://elecraft.365791.n2.nabble.com/
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
>

usmcss

Re: KX2, is the ATU activated when you key the mic?

I didn’t see any smoke or smell anything. I don’t think the power was limited
but can’t be sure.

Pisses me off that I just got this radio, actually read the manual and
thought Autotune meant it automatically tuned when you key the mic! Now with
my OCD I have to wonder if the radio is operating at 100% I’m assuming that
if something happened it would be noticeable. I did hit New Jersey from
Illinois last night on ten but the band was bad and the guy was able to copy
me fully.

Thanks again Rich!

--
Sent from: http://elecraft.365791.n2.nabble.com/
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