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WSJT-X Problem with K3S

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stengrevics

WSJT-X Problem with K3S

When I transmit (using MSK144), the transmit stays on after the transmission is complete causing spillover into the next sequence. This happens randomly.

Anybody have any suggestions as to how to fix this?

Thanks,

John
WA1EAZ

Nicklas Johnson

Re: WSJT-X Problem with K3S

When I've had this happen with other rigs in the past, it's been because of
RF leaking back into the shack and causing CAT commands to fail (because of
common mode current on the serial line).

If you reduce power to something quite small, like 1-2 W, does it stop
happening?

Nick

On 12 January 2017 at 07:03, stengrevics <[hidden email]> wrote:

> When I transmit (using MSK144), the transmit stays on after the
> transmission
> is complete causing spillover into the next sequence. This happens
> randomly.
>
> Anybody have any suggestions as to how to fix this?
>
> Thanks,
>
> John
> WA1EAZ
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.
> nabble.com/WSJT-X-Problem-with-K3S-tp7625670.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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--
*N6OL*
Saying something doesn't make it true. Belief in something doesn't make it
real. And if you have to lie to support a position, that position is not
worth supporting.
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stengrevics

Re: WSJT-X Problem with K3S

Hi Nick,

Thanks for the suggestion! I turned the power down to 2 watts and the problem went away.

What’s the solution, ferrites on the USB cable?

John
WA1EAZ

> On Jan 12, 2017, at 10:28 AM, Nicklas Johnson <[hidden email]> wrote:
>
> When I've had this happen with other rigs in the past, it's been because of RF leaking back into the shack and causing CAT commands to fail (because of common mode current on the serial line).
>
> If you reduce power to something quite small, like 1-2 W, does it stop happening?
>
> Nick
>
> On 12 January 2017 at 07:03, stengrevics <[hidden email] <mailto:[hidden email]>> wrote:
> When I transmit (using MSK144), the transmit stays on after the transmission
> is complete causing spillover into the next sequence. This happens
> randomly.
>
> Anybody have any suggestions as to how to fix this?
>
> Thanks,
>
> John
> WA1EAZ
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/WSJT-X-Problem-with-K3S-tp7625670.html <http://elecraft.365791.n2.nabble.com/WSJT-X-Problem-with-K3S-tp7625670.html>
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft <http://mailman.qth.net/mailman/listinfo/elecraft>
> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm>
> Post: mailto:[hidden email] <mailto:[hidden email]>
>
> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
> Message delivered to [hidden email] <mailto:[hidden email]>
>
>
>
> --
> N6OL
> Saying something doesn't make it true. Belief in something doesn't make it real. And if you have to lie to support a position, that position is not worth supporting.

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Nicklas Johnson

Re: WSJT-X Problem with K3S

Two things: one is to go through the usual steps around keeping RF out of
the shack. There are a lot of resources around this online regarding
baluns, "ugly baluns" and so-on.

The other thing I've done is exactly as you've said: several turns of
computer cables through ferrite. Watch your cable bend radius.

Nick

On 12 January 2017 at 08:05, John Stengrevics <[hidden email]>
wrote:

> Hi Nick,
>
> Thanks for the suggestion! I turned the power down to 2 watts and the
> problem went away.
>
> What’s the solution, ferrites on the USB cable?
>
> John
> WA1EAZ
>
> On Jan 12, 2017, at 10:28 AM, Nicklas Johnson <[hidden email]> wrote:
>
> When I've had this happen with other rigs in the past, it's been because
> of RF leaking back into the shack and causing CAT commands to fail (because
> of common mode current on the serial line).
>
> If you reduce power to something quite small, like 1-2 W, does it stop
> happening?
>
> Nick
>
> On 12 January 2017 at 07:03, stengrevics <[hidden email]> wrote:
>
>> When I transmit (using MSK144), the transmit stays on after the
>> transmission
>> is complete causing spillover into the next sequence. This happens
>> randomly.
>>
>> Anybody have any suggestions as to how to fix this?
>>
>> Thanks,
>>
>> John
>> WA1EAZ
>>
>>
>>
>> --
>> View this message in context: http://elecraft.365791.n2.nabb
>> le.com/WSJT-X-Problem-with-K3S-tp7625670.html
>> Sent from the Elecraft mailing list archive at 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]
>>
>
>
>
> --
> *N6OL*
> Saying something doesn't make it true. Belief in something doesn't make
> it real. And if you have to lie to support a position, that position is not
> worth supporting.
>
>
>

Don Wilhelm

Re: WSJT-X Problem with K3S

In reply to this post by stengrevics

John,

The first step to solving RF-in-the-shack problems is to work on your
antenna system. Better common mode chokes on your feedline(s).
See the information by Jim Brown K9YC at
http://audiosystemsgroup.com/RFI-Ham.pdf.

If you still have problems after taking those measures, then use ferites
on cables as a last resort solution.

The reason I say this is because if you have RF interfering with the
wiring in your station, you likely have similar interference on all
wires in your station - you can fix one or two, but another similar
problem will rear its ugly head later on.
If you fix the problem at its source, you will fix a lot of "strange
behaviors".

73,
Don W3FPR

On 1/12/2017 11:05 AM, John Stengrevics wrote:
> Hi Nick,
>
> Thanks for the suggestion! I turned the power down to 2 watts and the problem went away.
>
> What’s the solution, ferrites on the USB cable?
>
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stengrevics

Re: WSJT-X Problem with K3S

Thanks Don. I already have ferrites all over my coax cables, Anderson power cables, literally all over the house.

Will try on the USB cable as well.

John
WA1EAZ

> On Jan 12, 2017, at 11:17 AM, Don Wilhelm <[hidden email]> wrote:
>
> John,
>
> The first step to solving RF-in-the-shack problems is to work on your antenna system. Better common mode chokes on your feedline(s).
> See the information by Jim Brown K9YC at http://audiosystemsgroup.com/RFI-Ham.pdf.
>
> If you still have problems after taking those measures, then use ferites on cables as a last resort solution.
>
> The reason I say this is because if you have RF interfering with the wiring in your station, you likely have similar interference on all wires in your station - you can fix one or two, but another similar problem will rear its ugly head later on.
> If you fix the problem at its source, you will fix a lot of "strange behaviors".
>
> 73,
> Don W3FPR
>
> On 1/12/2017 11:05 AM, John Stengrevics wrote:
>> Hi Nick,
>>
>> Thanks for the suggestion! I turned the power down to 2 watts and the problem went away.
>>
>> What’s the solution, ferrites on the USB cable?
>>

Nicklas Johnson

Re: WSJT-X Problem with K3S

The other thing, too, is if your antenna is just relatively close in
proximity to your shack, it won't matter how well balanced your feedline
is; you may still end up with cables inside your house that are resonant at
or near the frequency where you're transmitting, or at least near enough to
cause problems, with an intentional radiator (your antenna) nearby. For
whatever reason, this always seems to be worse on 20 meters than other
bands with home electronics. Then I don't know of an option for offending
equipment other than a few turns through some hefty ferrite on the resonant
cable(s).

(As I'm sure you know, a lot of home electronics are poorly executed with
respect to keeping out common mode currents... Jim Brown K9YC has published
a lot of really great information about this state of affairs. Sometimes
the entry point for common mode noise isn't what you would expect, too.)

If you're like me, and you have a dipole antenna mounted on your roof,
getting it up a little higher may help some too...or just learning to live
with lower power output. My threshold at home with digital modes on 20m is
about 27 watts... below that, everything is fine. Above that, everything
is terrible. Fortunately, most of the time I don't even need that much to
make a successful contact, and even with modes like WinLink, 15 watts is
plenty.

Nick

On 12 January 2017 at 08:21, John Stengrevics <[hidden email]>
wrote:

> Thanks Don. I already have ferrites all over my coax cables, Anderson
> power cables, literally all over the house.
>
> Will try on the USB cable as well.
>
> John
> WA1EAZ
>
> > On Jan 12, 2017, at 11:17 AM, Don Wilhelm <[hidden email]>
> wrote:
> >
> > John,
> >
> > The first step to solving RF-in-the-shack problems is to work on your
> antenna system. Better common mode chokes on your feedline(s).
> > See the information by Jim Brown K9YC at http://audiosystemsgroup.com/
> RFI-Ham.pdf.
> >
> > If you still have problems after taking those measures, then use ferites
> on cables as a last resort solution.
> >
> > The reason I say this is because if you have RF interfering with the
> wiring in your station, you likely have similar interference on all wires
> in your station - you can fix one or two, but another similar problem will
> rear its ugly head later on.
> > If you fix the problem at its source, you will fix a lot of "strange
> behaviors".
> >
> > 73,
> > Don W3FPR
> >
> > On 1/12/2017 11:05 AM, John Stengrevics wrote:
> >> Hi Nick,
> >>
> >> Thanks for the suggestion! I turned the power down to 2 watts and the
> problem went away.
> >>
> >> What’s the solution, ferrites on the USB cable?
> >>
>
>

Joe Subich, W4TV-4

Re: WSJT-X Problem with K3S

In reply to this post by stengrevics

On 1/12/2017 11:05 AM, John Stengrevics wrote:
> What’s the solution, ferrites on the USB cable?

Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to
RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting
the PTT Port the same as the CAT Port.

73,

... Joe, W4TV

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Nicklas Johnson

Re: WSJT-X Problem with K3S

Unless I'm mistaken, doesn't the K3S connect directly via USB though? If
the problem is happening because of common mode on the USB cable, there is
no physical RTS line involved like there would be in an old-style COM/RS232
device- there is only serial data going across a USB cable to a logical COM
device inside the K3S. It most likely wouldn't change anything in this
case.

Nick

On 12 January 2017 at 10:08, Joe Subich, W4TV <[hidden email]> wrote:

>
> On 1/12/2017 11:05 AM, John Stengrevics wrote:
> > What’s the solution, ferrites on the USB cable?
>
> Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to
> RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting
> the PTT Port the same as the CAT Port.
>
> 73,
>
> ... Joe, W4TV
>
>
>
> ______________________________________________________________
> 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]
>

stengrevics

Re: WSJT-X Problem with K3S

Correct. The K3S is connected directly to my Mac via a USB cable.

John
WA1EAZ

> On Jan 12, 2017, at 1:15 PM, Nicklas Johnson <[hidden email]> wrote:
>
> Unless I'm mistaken, doesn't the K3S connect directly via USB though? If
> the problem is happening because of common mode on the USB cable, there is
> no physical RTS line involved like there would be in an old-style COM/RS232
> device- there is only serial data going across a USB cable to a logical COM
> device inside the K3S. It most likely wouldn't change anything in this
> case.
>
> Nick
>
> On 12 January 2017 at 10:08, Joe Subich, W4TV <[hidden email] <mailto:[hidden email]>> wrote:
>
>>
>> On 1/12/2017 11:05 AM, John Stengrevics wrote:
>>> What’s the solution, ferrites on the USB cable?
>>
>> Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to
>> RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting
>> the PTT Port the same as the CAT Port.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>>
>> ______________________________________________________________
>> 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] <mailto:[hidden email]>
>>
>
>
>
> --
> *N6OL*
> Saying something doesn't make it true. Belief in something doesn't make it
> real. And if you have to lie to support a position, that position is not
> worth supporting.
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft <http://mailman.qth.net/mailman/listinfo/elecraft>
> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm>
> Post: mailto:[hidden email] <mailto:[hidden email]>
>
> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
> Message delivered to [hidden email] <mailto:[hidden email]>

Joe Subich, W4TV-4

Re: WSJT-X Problem with K3S

In reply to this post by Nicklas Johnson

> there is no physical RTS line involved like there would be in an
> old-style COM/RS232 device- there is only serial data going across a
> USB cable to a logical COM device inside the K3S. It most likely
> wouldn't change anything in this case.

The physical RTS line is moved from the computer to the output of
the USB UART (in the K3). However, there is still a physical RTS
line. The set RTS/DTR/Break and clear RTS/DTR/Break commands are
much more robust than sending serial data via USB.

Using RTS is *always* more robust (and less susceptible to RFI)
that using CAT commands for TS?RX switching.

73,

... Joe, W4TV

On 1/12/2017 1:15 PM, Nicklas Johnson wrote:

> Unless I'm mistaken, doesn't the K3S connect directly via USB though? If
> the problem is happening because of common mode on the USB cable, there is
> no physical RTS line involved like there would be in an old-style COM/RS232
> device- there is only serial data going across a USB cable to a logical COM
> device inside the K3S. It most likely wouldn't change anything in this
> case.
>
> Nick
>
> On 12 January 2017 at 10:08, Joe Subich, W4TV <[hidden email]> wrote:
>
>>
>> On 1/12/2017 11:05 AM, John Stengrevics wrote:
>>> What’s the solution, ferrites on the USB cable?
>>
>> Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to
>> RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting
>> the PTT Port the same as the CAT Port.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>>
>> ______________________________________________________________
>> 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]
>>
>
>
>

Guy Olinger K2AV

Re: WSJT-X Problem with K3S

In reply to this post by Joe Subich, W4TV-4

You should really do what Joe suggested. It is highly unlikely that RFI
would ONLY affect the one CAT command. It more likely is some kind of
timing entanglement which will be difficult to diagnose.

DO try what Joe said:

On Thu, Jan 12, 2017 at 1:08 PM, Joe Subich, W4TV <[hidden email]> wrote:

> Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to
> RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting
> the PTT Port the same as the CAT Port.
>

No kidding, try it!

73, Guy K2AV
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Don Wilhelm

Re: WSJT-X Problem with K3S

In reply to this post by Nicklas Johnson

Nick,

Yes, the K3S connects directly to USB, but inside the K3S is an FTDI USB
to serial converter. It has the RTS and DTR signals and they are
properly routed to the K3S. The RS-232 circuits in the K3S are retained
just like as they were with the K3.

73,
Don W3FPR

On 1/12/2017 1:15 PM, Nicklas Johnson wrote:
> Unless I'm mistaken, doesn't the K3S connect directly via USB though? If
> the problem is happening because of common mode on the USB cable, there is
> no physical RTS line involved like there would be in an old-style COM/RS232
> device
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Jim Brown-10

Re: WSJT-X Problem with K3S

In reply to this post by Guy Olinger K2AV

On Thu,1/12/2017 10:33 AM, Guy Olinger K2AV wrote:
> DO try what Joe said:

Or use VOX. I do lots of RTTY and occasional WSJT modes (JT65, JT9,
FSK441, ISCAT) and have never used anything but VOX. And WSJT-X can
easily be set to use VOX.

73, Jim K9YC

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Nr4c

Re: WSJT-X Problem with K3S

In reply to this post by stengrevics

Could you have multiple PTTs active. Like PTT and VOX, or two PTTs refed in software?

Sent from my iPhone
...nr4c. bill

> On Jan 12, 2017, at 10:03 AM, stengrevics <[hidden email]> wrote:
>
> When I transmit (using MSK144), the transmit stays on after the transmission
> is complete causing spillover into the next sequence. This happens
> randomly.
>
> Anybody have any suggestions as to how to fix this?
>
> Thanks,
>
> John
> WA1EAZ
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/WSJT-X-Problem-with-K3S-tp7625670.html
> Sent from the Elecraft mailing list archive at 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]

stengrevics

Re: WSJT-X Problem with K3S

Thanks all. I’ll try Joe’s suggestion, but have to research it first.

John
WA1EAZ

> On Jan 12, 2017, at 1:50 PM, Nr4c <[hidden email]> wrote:
>
> Could you have multiple PTTs active. Like PTT and VOX, or two PTTs refed in software?
>
> Sent from my iPhone
> ...nr4c. bill
>
>
>> On Jan 12, 2017, at 10:03 AM, stengrevics <[hidden email]> wrote:
>>
>> When I transmit (using MSK144), the transmit stays on after the transmission
>> is complete causing spillover into the next sequence. This happens
>> randomly.
>>
>> Anybody have any suggestions as to how to fix this?
>>
>> Thanks,
>>
>> John
>> WA1EAZ
>>
>>
>>
>> --
>> View this message in context: http://elecraft.365791.n2.nabble.com/WSJT-X-Problem-with-K3S-tp7625670.html
>> Sent from the Elecraft mailing list archive at 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]
>

Nr4c

Re: WSJT-X Problem with K3S

In reply to this post by Nicklas Johnson

The USB port on K3S also has the DTR and RTS information available.

Sent from my iPhone
...nr4c. bill

> On Jan 12, 2017, at 1:15 PM, Nicklas Johnson <[hidden email]> wrote:
>
> Unless I'm mistaken, doesn't the K3S connect directly via USB though? If
> the problem is happening because of common mode on the USB cable, there is
> no physical RTS line involved like there would be in an old-style COM/RS232
> device- there is only serial data going across a USB cable to a logical COM
> device inside the K3S. It most likely wouldn't change anything in this
> case.
>
> Nick
>
>> On 12 January 2017 at 10:08, Joe Subich, W4TV <[hidden email]> wrote:
>>
>>
>>> On 1/12/2017 11:05 AM, John Stengrevics wrote:
>>> What’s the solution, ferrites on the USB cable?
>>
>> Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to
>> RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting
>> the PTT Port the same as the CAT Port.
>>
>> 73,
>>
>> ... Joe, W4TV
>>
>>
>>
>> ______________________________________________________________
>> 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]
>>
>
>
>
> --
> *N6OL*
> Saying something doesn't make it true. Belief in something doesn't make it
> real. And if you have to lie to support a position, that position is not
> worth supporting.
> ______________________________________________________________
> 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]

Nicklas Johnson

Re: WSJT-X Problem with K3S

In reply to this post by Don Wilhelm

In that case it's probably statistically slightly more likely that a CAT
command (seems like about 5 bytes) would get garbled going across the USB
than whatever bit stream went across the USB to turn RTS off. One would be
an op-code (probably 8 bits) plus 5 more bytes, versus the other being just
an op code. So it's odds of garbling 1 or more bits out of 8 versus 1 or
more bits out of ~48. Probably mitigates the problem somewhat, but mostly
likely won't make it completely go away.

The best thing still will be attenuating the common mode noise on the USB
cable, IMO... keep it out of there in the first place.

Nick

On 12 January 2017 at 10:41, Don Wilhelm <[hidden email]> wrote:

> Nick,
>
> Yes, the K3S connects directly to USB, but inside the K3S is an FTDI USB
> to serial converter. It has the RTS and DTR signals and they are properly
> routed to the K3S. The RS-232 circuits in the K3S are retained just like
> as they were with the K3.
>
> 73,
> Don W3FPR
>
> On 1/12/2017 1:15 PM, Nicklas Johnson wrote:
>
>> Unless I'm mistaken, doesn't the K3S connect directly via USB though? If
>> the problem is happening because of common mode on the USB cable, there is
>> no physical RTS line involved like there would be in an old-style
>> COM/RS232
>> device
>>
>

Edward R Cole

Re: WSJT-X Problem with K3S

In reply to this post by stengrevics

Now that the thread has morphed to RFI:

I was getting complaints from my wife that my transmissions were
getting into the home theater audio when she was watching
TV. Specifically, it was getting into the new powered woofer. I
determined this was only happening on 6m and at 1000w.

So I had an extra ferrite donut from building the 50v switching PS
and wrapped the coaxial audio line thru it a few times, then added a
clamp on ferrite to the ac cord feeding the woofer. That fixed it!

picture of these applied to the 50v swps:
http://www.kl7uw.com/6m_control_panel_back_3.jpg

73, Ed - KL7UW
http://www.kl7uw.com
Dubus-NA Business mail:
[hidden email]

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stengrevics

Re: WSJT-X Problem with K3S

Three turns of the USB cable through a #43 ferrite and I am good to go at full power (95 watts).

John
WA1EAZ

> On Jan 12, 2017, at 2:40 PM, Edward R Cole <[hidden email]> wrote:
>
> Now that the thread has morphed to RFI:
>
> I was getting complaints from my wife that my transmissions were getting into the home theater audio when she was watching TV. Specifically, it was getting into the new powered woofer. I determined this was only happening on 6m and at 1000w.
>
> So I had an extra ferrite donut from building the 50v switching PS and wrapped the coaxial audio line thru it a few times, then added a clamp on ferrite to the ac cord feeding the woofer. That fixed it!
>
> picture of these applied to the 50v swps:
> http://www.kl7uw.com/6m_control_panel_back_3.jpg
>
> 73, Ed - KL7UW
> http://www.kl7uw.com
> Dubus-NA Business mail:
> [hidden email]
> ______________________________________________________________
> 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]