KPA1500 ATU TUNE/MODE button Q.

[Bill Hassan]

I was noticing that when I hold the  ATU TUNE/ATU MODE button, the BYPASS
led above it always stays on.
The IN led will switch on and off as I hold the button a second time, but
the bypass led will always remains on.
I don't hear any relays latch.

This happens on all bands, except for 30m.

On 30m, holding in the button, releasing it and holding it again will turn
on the IN led, and then the BYPASS led.
I can hear the relays latch into place as it goes from in to bypass to in...

On all bands tapping the button will put the amp into tune mode. All normal
there.

Something doesn't seem right with the ATU if the bypass and the in led are
on at the same time.

Perhaps this could explain my other problems.

SN 209. Arrived 6/2, ordered late Oct.

Thoughts, ideas?

Bill, K1SM
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[Dick Dievendorff-4]

If you HOLD the ATU TUNE button, you switch the ATU between IN and BYPASS.  When you tap ATU tune, and provide some RF from the exciter, the ATU searches for a match.  If the SWR of the antenna is good enough without ATU reactances, the ATU discovers that the best tuning solution for that frequency is “bypassed”. And when that happens, both ATU LEDS are illuminated.  If you tune further up or down the band, and your antenna SWR is above 1.2, the ATU will insert reactances and if it does, the ATU BYP LED is not illuminated.

73 de Dick, K6KR

> On Jun 3, 2018, at 18:06, Bill Hassan <[hidden email]> wrote:
>
> I was noticing that when I hold the  ATU TUNE/ATU MODE button, the BYPASS
> led above it always stays on.
> The IN led will switch on and off as I hold the button a second time, but
> the bypass led will always remains on.
> I don't hear any relays latch.
>
> This happens on all bands, except for 30m.
>
> On 30m, holding in the button, releasing it and holding it again will turn
> on the IN led, and then the BYPASS led.
> I can hear the relays latch into place as it goes from in to bypass to in...
>
> On all bands tapping the button will put the amp into tune mode. All normal
> there.
>
> Something doesn't seem right with the ATU if the bypass and the in led are
> on at the same time.
>
> Perhaps this could explain my other problems.
>
> SN 209. Arrived 6/2, ordered late Oct.
>
> Thoughts, ideas?
>
> Bill, K1SM
> ______________________________________________________________
> 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]

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