K3 Output Isolation

[N5GE]

I just installed a new direct feedline on my 6m Yagi and hooking it up to
Antenna 2.  When I tested it I was horrified when I saw infinity SWR on my W1
power meter.  Then I realized the watt meter was not in the 6m feedline and the
rig was happily displaying a 1:1 SWR.

Hmm, that means there is output on ANT 1 when ANT 2 is selected.  I switched the
ANT 1 connection to a dummy load and the W1 was showing .1 watt output from ANT1
with a 1.2:1 SWR.

Is my Factory rig #806 the only rig with this leakage or is it a known issue? If
so is there a fix for it?

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up
Essential Liberty to
purchase a little Temporary
Safety deserve neither
Liberty nor Safety"

An excerpt from a letter
written in 1755 from the
Assembly to the Governor
of Pennsylvania.

Support the entire Constitution, not
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

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[Bud Semon N7CW]

Tom,

I have my 6M antenna on ANT 2 and whatever HF antenna on ANT 1 all the time.
I have never seen the HF wattmeter even wiggle.  The lowest power scale I
have on the power meter is 100 Watts, though.  I just ran a couple tests,
running 100 W on 6M and connected various antennas to ANT 1, including a
dummy load and an open.  No movement.  Just a data point...

73 Bud N7CW

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Tom Childers, N5GE
Sent: Saturday, July 19, 2008 10:49 AM
To: Elecraft Discussion List
Subject: [Elecraft] K3 Output Isolation

I just installed a new direct feedline on my 6m Yagi and hooking it up to
Antenna 2.  When I tested it I was horrified when I saw infinity SWR on my
W1
power meter.  Then I realized the watt meter was not in the 6m feedline and
the
rig was happily displaying a 1:1 SWR.

Hmm, that means there is output on ANT 1 when ANT 2 is selected.  I switched
the
ANT 1 connection to a dummy load and the W1 was showing .1 watt output from
ANT1
with a 1.2:1 SWR.

Is my Factory rig #806 the only rig with this leakage or is it a known
issue? If
so is there a fix for it?

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up
Essential Liberty to
purchase a little Temporary
Safety deserve neither
Liberty nor Safety"

An excerpt from a letter
written in 1755 from the
Assembly to the Governor
of Pennsylvania.

Support the entire Constitution, not
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

_______________________________________________
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[N5GE]

On Sat, 19 Jul 2008 11:30:34 -0700, "Bud Semon N7CW" <[hidden email]> wrote:

>Tom,
>
>I have my 6M antenna on ANT 2 and whatever HF antenna on ANT 1 all the time.
>I have never seen the HF wattmeter even wiggle.  The lowest power scale I
>have on the power meter is 100 Watts, though.  I just ran a couple tests,
>running 100 W on 6M and connected various antennas to ANT 1, including a
>dummy load and an open.  No movement.  Just a data point...
>
>73 Bud N7CW
>

[snip]

I'm using an Elecraft W1 watt meter which can resolve .1 watt and show an
accurate SWR at that power level.

73,

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up
Essential Liberty to
purchase a little Temporary
Safety deserve neither
Liberty nor Safety"

An excerpt from a letter
written in 1755 from the
Assembly to the Governor
of Pennsylvania.

Support the entire Constitution, not
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

_______________________________________________
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Post to: [hidden email]
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[Dave Hachadorian]

----- Original Message -----
From: "Tom Childers, N5GE" <[hidden email]>
To: "Elecraft Discussion List" <[hidden email]>
Sent: Saturday, July 19, 2008 10:48 AM
Subject: [Elecraft] K3 Output Isolation


I just installed a new direct feedline on my 6m Yagi and
hooking it up to
Antenna 2.  When I tested it I was horrified when I saw
infinity SWR on my W1
power meter.  Then I realized the watt meter was not in the
6m feedline and the
rig was happily displaying a 1:1 SWR.

Hmm, that means there is output on ANT 1 when ANT 2 is
selected.  I switched the
ANT 1 connection to a dummy load and the W1 was showing .1
watt output from ANT1
with a 1.2:1 SWR.
----------------------------

Could it be that 6 meter RF is getting picked up by your HF
antenna, and fed down the HF feedline, messing with your SWR
meter?

Dave Hachadorian, K6LL
Big Bear Lake, CA

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[N5GE]

On Sat, 19 Jul 2008 12:48:45 -0500, "Tom Childers, N5GE" <[hidden email]> wrote:

>I just installed a new direct feedline on my 6m Yagi and hooking it up to
>Antenna 2.  When I tested it I was horrified when I saw infinity SWR on my W1
>power meter.  Then I realized the watt meter was not in the 6m feedline and the
>rig was happily displaying a 1:1 SWR.
>
>Hmm, that means there is output on ANT 1 when ANT 2 is selected.  I switched the
>ANT 1 connection to a dummy load and the W1 was showing .1 watt output from ANT1
>with a 1.2:1 SWR.
>
>Is my Factory rig #806 the only rig with this leakage or is it a known issue? If
>so is there a fix for it?

[snip]

The issue was corrected this weekend when I replaced the shack to tower
feedlines for 6m, 2m and 70cm with LMR600, so the person who suggested it was
coming in on the HF feedline was correct.

73,

Tom, N5GE - SWOT 3537 - Grid EM12jq

"Those who would give up
Essential Liberty to
purchase a little Temporary
Safety deserve neither
Liberty nor Safety"

An excerpt from a letter
written in 1755 from the
Assembly to the Governor
of Pennsylvania.

Support the entire Constitution, not
just the parts you like.

http://www.n5ge.com
http://www.eQSL.cc/Member.cfm?N5GE

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