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atu effect on low power out of kxv60 (was xv144 alignment )

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Michael Jensen

atu effect on low power out of kxv60 (was xv144 alignment )

When i installed the kxv60 i did not have the atu installed. After a broken diode every thing tested ok. atu was installed. And tested ok. I did not recheck the kxv60. when pressing tune to tx while aligning power on xv144 i saw that the power from k2 could only reach something like 0.2 mW. i mentioned it here and got some help. now i did an other test on kxv60 having taken the lid of k2 every thing worked ok 1mW was send when pressing tune. I put the k2 together and started the xv144 alignment. Now the problem was back. I have now found that pressing tune with the atu installed result in only 0.2 mW on the low power out.
removing the atu control cable from the control board the low power out are now 1mW pressing tune. i do not have a power meter able to measure that level, but i belive having the atu installed makes the low power output to be about 1/5 using tune to tx. Seems that low power out are ok when keying the k2 with the mic and with the atu installed. Only measurement i could do was to to check the output from the transverter. I aligned the xv144 using the k2 with out the atu. so 1 mW displayed on the display giving 20W on the xv144. Installing the atu in k2 pressing tune give 6w from the xv144. Now keying with mic shouting the south european olaaa drive xv144 to 20w. any word on this please
thanks in advance
OZ1BZJ

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Don Brown-4

Re: atu effect on low power out of kxv60 (was xv144alignment )

Hi

Yes I ran into this about a year ago. The problem is the KAT2 does not have
a three state output driver for the RF detector as the KPA100 and KAT100
have and the KAT2 is loading the RF detect line. Changing R6 on the KAT2 to
a higher value will solve the problem. I used 470 ohms rather than the 47
ohm resistor normally installed.

Don Brown

KD5NDB

----- Original Message -----
From: "michael jensen" <[hidden email]>
To: <[hidden email]>
Sent: Sunday, February 26, 2006 11:57 AM
Subject: [Elecraft] atu effect on low power out of kxv60 (was
xv144alignment )

When i installed the kxv60 i did not have the atu installed. After a broken
diode every thing tested ok. atu was installed. And tested ok. I did not
recheck the kxv60. when pressing tune to tx while aligning power on xv144
i saw that the power from k2 could only reach something like 0.2 mW. i
mentioned it here and got some help. now i did an other test on kxv60
having taken the lid of k2 every thing worked ok 1mW was send when pressing
tune. I put the k2 together and started the xv144 alignment. Now the
problem was back. I have now found that pressing tune with the atu installed
result in only 0.2 mW on the low power out.
removing the atu control cable from the control board the low power out are
now 1mW pressing tune. i do not have a power meter able to measure that
level, but i belive having the atu installed makes the low power output to
be about 1/5 using tune to tx. Seems that low power out are ok when keying
the k2 with the mic and with the atu installed. Only measurement i could
do was to to check the output from the transverter. I aligned the xv144
using the k2 with out the atu. so 1 mW displayed on the display giving 20W
on the xv144. Installing the atu in k2 pressing tune give 6w from the
xv144. Now keying with mic shouting the south european olaaa drive xv144 to
20w. any word on this please
thanks in advance
OZ1BZJ

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Matt Osborn

Re: atu effect on low power out of kxv60 (was xv144 alignment )

In reply to this post by Michael Jensen

Michael,

The ATU automatically cuts the power when using tune. You can prevent
that by setting the ATU menu to CALS or CALP. Remember to set it back
to AUTO when you're done calibrating the xv144.

On Sun, 26 Feb 2006 18:57:54 +0100, "michael jensen"
<[hidden email]> wrote:

>When i installed the kxv60 i did not have the atu installed. After a broken diode every thing tested ok. atu was installed. And tested ok. I did not recheck the kxv60. when pressing tune to tx while aligning power on xv144 i saw that the power from k2 could only reach something like 0.2 mW. i mentioned it here and got some help. now i did an other test on kxv60 having taken the lid of k2 every thing worked ok 1mW was send when pressing tune. I put the k2 together and started the xv144 alignment. Now the problem was back. I have now found that pressing tune with the atu installed result in only 0.2 mW on the low power out.
>removing the atu control cable from the control board the low power out are now 1mW pressing tune. i do not have a power meter able to measure that level, but i belive having the atu installed makes the low power output to be about 1/5 using tune to tx. Seems that low power out are ok when keying the k2 with the mic and with the atu installed. Only measurement i could do was to to check the output from the transverter. I aligned the xv144 using the k2 with out the atu. so 1 mW displayed on the display giving 20W on the xv144. Installing the atu in k2 pressing tune give 6w from the xv144. Now keying with mic shouting the south european olaaa drive xv144 to 20w. any word on this please
>thanks in advance
>OZ1BZJ
>
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Michael Jensen

Re: atu effect on low power out of kxv60 (was xv144alignment )

In reply to this post by Don Brown-4

Great thanks Don

I will try that.

Br.

Michael
----- Original Message -----
From: "Don Brown" <[hidden email]>
To: "michael jensen" <[hidden email]>; <[hidden email]>
Sent: Sunday, February 26, 2006 7:17 PM
Subject: Re: [Elecraft] atu effect on low power out of kxv60 (was
xv144alignment )

> Hi
>
> Yes I ran into this about a year ago. The problem is the KAT2 does not
> have a three state output driver for the RF detector as the KPA100 and
> KAT100 have and the KAT2 is loading the RF detect line. Changing R6 on the
> KAT2 to a higher value will solve the problem. I used 470 ohms rather than
> the 47 ohm resistor normally installed.
>
> Don Brown
>
> KD5NDB
>
>
>
>
> ----- Original Message -----
> From: "michael jensen" <[hidden email]>
> To: <[hidden email]>
> Sent: Sunday, February 26, 2006 11:57 AM
> Subject: [Elecraft] atu effect on low power out of kxv60 (was
> xv144alignment )
>
>
> When i installed the kxv60 i did not have the atu installed. After a
> broken diode every thing tested ok. atu was installed. And tested ok. I
> did not recheck the kxv60. when pressing tune to tx while aligning power
> on xv144 i saw that the power from k2 could only reach something like 0.2
> mW. i mentioned it here and got some help. now i did an other test on
> kxv60 having taken the lid of k2 every thing worked ok 1mW was send when
> pressing tune. I put the k2 together and started the xv144 alignment. Now
> the problem was back. I have now found that pressing tune with the atu
> installed result in only 0.2 mW on the low power out.
> removing the atu control cable from the control board the low power out
> are now 1mW pressing tune. i do not have a power meter able to measure
> that level, but i belive having the atu installed makes the low power
> output to be about 1/5 using tune to tx. Seems that low power out are ok
> when keying the k2 with the mic and with the atu installed. Only
> measurement i could do was to to check the output from the transverter. I
> aligned the xv144 using the k2 with out the atu. so 1 mW displayed on
> the display giving 20W on the xv144. Installing the atu in k2 pressing
> tune give 6w from the xv144. Now keying with mic shouting the south
> european olaaa drive xv144 to 20w. any word on this please
> thanks in advance
> OZ1BZJ
>
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
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>
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> Elecraft web page: http://www.elecraft.com
>

Michael Jensen

Re: atu effect on low power out of kxv60 (was xv144 alignment )

In reply to this post by Matt Osborn

Thank List and Don x2 and Matt

You hit it right on.

Pressing Display & Tune bypassing the power reduction of the KAT2, did get
the power up to about 0.57mW from the 0.2. Replacing R6 with a 470 Ohm on
the KAT2 did the rest. Now low power controle seems to be ok and the first
on air test of the XV144 work great. Still a few things to do RF seems to
sneak in some where, maybe i was not good enough removing the paint. Then a
issue on the K2, that the freq on XV144 are 1,2 Khz off. Proberly the VCO
alignmant of K2 or maybe i just need to make an adjustment in the Menu setup
of the transverter.
The Transverter also seems to drift on TX for the first 5-10 min of use. I
had a VHF contester to provide me with report. So maybe an oven are needed.

Br.

Michael

----- Original Message -----
From: "Matt Osborn" <[hidden email]>
To: "michael jensen" <[hidden email]>; <[hidden email]>
Sent: Sunday, February 26, 2006 9:48 PM
Subject: Re: [Elecraft] atu effect on low power out of kxv60 (was xv144
alignment )

Michael,

The ATU automatically cuts the power when using tune. You can prevent
that by setting the ATU menu to CALS or CALP. Remember to set it back
to AUTO when you're done calibrating the xv144.

On Sun, 26 Feb 2006 18:57:54 +0100, "michael jensen"
<[hidden email]> wrote:

>When i installed the kxv60 i did not have the atu installed. After a
>broken diode every thing tested ok. atu was installed. And tested ok. I
>did not recheck the kxv60. when pressing tune to tx while aligning power
>on xv144 i saw that the power from k2 could only reach something like 0.2
>mW. i mentioned it here and got some help. now i did an other test on
>kxv60 having taken the lid of k2 every thing worked ok 1mW was send when
>pressing tune. I put the k2 together and started the xv144 alignment. Now
>the problem was back. I have now found that pressing tune with the atu
>installed result in only 0.2 mW on the low power out.
>removing the atu control cable from the control board the low power out are
>now 1mW pressing tune. i do not have a power meter able to measure that
>level, but i belive having the atu installed makes the low power output to
>be about 1/5 using tune to tx. Seems that low power out are ok when keying
>the k2 with the mic and with the atu installed. Only measurement i could
>do was to to check the output from the transverter. I aligned the xv144
>using the k2 with out the atu. so 1 mW displayed on the display giving 20W
>on the xv144. Installing the atu in k2 pressing tune give 6w from the
>xv144. Now keying with mic shouting the south european olaaa drive xv144
>to 20w. any word on this please
>thanks in advance
>OZ1BZJ
>
>_______________________________________________
>Elecraft mailing list
>Post to: [hidden email]
>You must be a subscriber to post to the list.
>Subscriber Info (Addr. Change, sub, unsub etc.):
> http://mailman.qth.net/mailman/listinfo/elecraft
>
>Help: http://mailman.qth.net/subscribers.htm
>Elecraft web page: http://www.elecraft.com