KX3 KXAT3 SWR re-tune request threshold

[Pierre]

Hi folks,

For years, I have worked portable with an inverted-vee as a multiband antenna and a ladder line feeder. With the KX1 internal tuner, the T1 or a LDG Z-817, once tuned in a band, I did not have to re-tune as long as I stayed in that band.

However, with the KXAT3 and with the same antenna, the ATU symbol often begins to 'flash' if I change frequency within a band requiring a new tuning even if I tuned on that band.

So... I wonder if a new menu item could be added in the KX3 offering the possibility  to set the SWR threshold over which there would be no re-tune request by the KXAT3? That threshold could be adjustable offering 3 choices like 1.5:1 and 2:2 or also even to 3:1 for example. I can cope easily with a 3:1 SWR, the loss is not so great...

Meanwhile, thanks again for that wonderful rig.

Pierre VE2PID KX3 S/N 190
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[stan levandowski]

Hello Pierre.  Once you have initally tuned in the band of your choice,
why don't you just bypass the internal ATU?

73, Stan WB2LQF


On Wed, Aug 1, 2012 at 6:58 PM, Pierre wrote:

  I can cope easily with a 3:1 SWR, the loss is not so great...
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[Pierre]

Hi Stan,

What I often do is to make very frequent band change so I would have to repeat each time the bypass/debypass process... I would prefer to have a higher threshold for all bands.

Or another possibility: At the start of a session, I could do a tuning somewhere in each band I plan to use. Then I would by-pass the ATU. Don't know if the L/C setting would be retained and recalled on band changes even if the ATU is by-passed..??

[Don Wilhelm-4]

Pierre,

When you "bypass" the tuner, it is taken out of the circuit (well
almost) - sort of like no tuner at all.

You would only want to set the tuner to bypass if you have resonant
antennas or you are working into a dummy load.

73,
Don W3FPR

On 8/1/2012 8:00 PM, Pierre wrote:
> Hi Stan,
>
> What I often do is to make very frequent band change so I would have to
> repeat each time the bypass/debypass process... I would prefer to have a
> higher threshold for all bands.
>

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[Don Wilhelm-4]

Pierre,

Wayne has responded on the KX3 Yahoo group that the band segments are 20
kHz wide, so if you start at the bottom of the band (well - 10 kHz
inside) and do an ATU TUNE, then move up 20 kHz and do another ATU TUNE
- continue until you get to the top of the band of interest - the KXAT3
will remember the settings for all those band segments and you will not
have to touch the ATU TUNE again until you change the antenna being used
for that particular band.

When working in the field, I do this as part of my initial setup and
there is no further concerns about tuning.  At home I set the tuner to
bypass because I have resonant antennas for each band - no tuner required.

73,
Don W3FPR
On 8/1/2012 8:00 PM, Pierre wrote:

> Hi Stan,
>
> What I often do is to make very frequent band change so I would have to
> repeat each time the bypass/debypass process... I would prefer to have a
> higher threshold for all bands.
>
> Or another possibility: At the start of a session, I could do a tuning
> somewhere in each band I plan to use. Then I would by-pass the ATU. Don't
> know if the L/C setting would be retained and recalled on band changes even
> if the ATU is by-passed..??
>
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/KX3-KXAT3-SWR-re-tune-request-threshold-tp7560139p7560143.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
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> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

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[stan levandowski]

Thanks for clearing that one up, Don.  I thought "bypass" would keep it
from attempting to retune but hold the last solution.  I guess I should
read the manual, eh?


On Wed, Aug 1, 2012 at 8:47 PM, Don Wilhelm wrote:

> Pierre,
>
> When you "bypass" the tuner, it is taken out of the circuit (well
> almost) - sort of like no tuner at all.
>
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[k6dgw]

On 8/2/2012 12:47 AM, Don Wilhelm wrote:
> You would only want to set the tuner to bypass if ... you are working into a dummy load.
That would be me.

Fred K6DGW
Auburn CA


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