Elecraft

[KAT500] 10m Spur

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Willard Myers

[KAT500] 10m Spur

Mine generates a clean S4 carrier at 28.004.55. Does anyone else see this, or know how to move it out of the band?

Bill, K1GQ
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Rick WA6NHC

Re: [KAT500] 10m Spur

I have a signal there too. Switching off the KAT500 reduces it, but that is due to the default antenna selection on power off. Changing antennas reduces the signal level (the 2nd antenna is nearer to the house).

If I switch the K3 antenna source (no antenna connected to port 2) it is completely gone and the tuner sits atop the K3.

Analysis: it isn't the KAT500. The signal is coming from another external source.

With the numerous computers, power supplies, radios, radiating HDMI cables in the house, I'm simply going to let this one (like many others) pass.

Rick wa6nhc

Tiny iPhone 5 keypad, typos are inevitable

On Feb 21, 2013, at 9:05 AM, K1GQ <[hidden email]> wrote:

> Mine generates a clean S4 carrier at 28.004.55. Does anyone else see this, or know how to move it out of the band?
>
> Bill, K1GQ
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Willard Myers

Re: [KAT500] 10m Spur

On 2013.02.21, at 12:39, Rick Bates <[hidden email]> wrote:

> Analysis: it isn't the KAT500. The signal is coming from another external source.

Not true in my case. The only way to completely suppress my spur is to remove 12VDC power to my KAT500 by disconnecting the power cable. Turning the KAT500 “off” isn’t enough because the internal electronics are still alive.

Bill, K1GQ
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Charles Johnson

Re: [KAT500] 10m Spur

In reply to this post by Willard Myers

I agree with Bill, K1GC, the signal is internal to the KAT500. Switching the KAT500 to bypass reduces it, but only disconnecting the 12 VDC line to the KAT500 gets rid of it completely. NOT an external signal. Seems to be coming into the K3 via common mode.

Charles, K4ZRJ

On Feb 21, 2013, at 12:05 PM, K1GQ <[hidden email]> wrote:

Greg - AB7R

Re: [KAT500] 10m Spur

Anyone try a ferrite or two clamped to the jumper between the radio
and tuner (or between the amp and tuner)?

Greg

On 2/21/13, Charles Johnson <[hidden email]> wrote:

> I agree with Bill, K1GC, the signal is internal to the KAT500. Switching the
> KAT500 to bypass reduces it, but only disconnecting the 12 VDC line to the
> KAT500 gets rid of it completely. NOT an external signal. Seems to be coming
> into the K3 via common mode.
>
> Charles, K4ZRJ
>
>
>
> On Feb 21, 2013, at 12:05 PM, K1GQ <[hidden email]> wrote:
>
>> Mine generates a clean S4 carrier at 28.004.55. Does anyone else see this,
>> or know how to move it out of the band?
>>
>> Bill, K1GQ
>> ______________________________________________________________
>> Elecraft mailing list
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>> This list hosted by: http://www.qsl.net
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>
> ______________________________________________________________
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Willard Myers

Re: [KAT500] 10m Spur

I’m using Elecraft cables for both connections; those cables have beads on each end. I added two more beads to each cable while watching the spur level with the K3 dBV meter; no effect.

FWIW, I’ve heard from two others KAT500 owners that hear the spur but didn’t post to the reflector. The spur is obvious on my P3.

On 2013.02.21, at 13:57, Greg <[hidden email]> wrote:

> Anyone try a ferrite or two clamped to the jumper between the radio
> and tuner (or between the amp and tuner)?
>
> Greg

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Rick WA6NHC

Re: [KAT500] 10m Spur

Ok, my bad for being incomplete in testing. I've now pulled the power off
of the KAT500 and yes the signal went away completely so it is the KAT500 as
the source not one of the other numerous sources around the shack. It is
reduced with power off, gone when the power is gone; antenna selection
varies the signal strength so perhaps a bit of leakage to the antenna ports?

It is a problem? Not to me, it is only one frequency and so (unnaturally)
stable that I can work around it. I'd guess that it is a clock (harmonic)
but it's VERY stable with no detectable deviation in pitch to my ear. Most
electronic clocks wander at least a little, harmonics much more, this is
rock solid.

73,
Rick wa6nhc

-----Original Message-----
From: K1GQ

I'm using Elecraft cables for both connections; those cables have beads on
each end. I added two more beads to each cable while watching the spur level
with the K3 dBV meter; no effect.

FWIW, I've heard from two others KAT500 owners that hear the spur but didn't
post to the reflector. The spur is obvious on my P3.

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John_N1JM

Re: [KAT500] 10m Spur

In reply to this post by Willard Myers

For me it is there but doesn't move the S-meter. I can barely see it on the P3 or SDR-IQ/SV.

73, John N1JM

Willard Myers wrote

Mine generates a clean S4 carrier at 28.004.55. Does anyone else see this, or know how to move it out of the band?

Bill, K1GQ
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Bill Hammond

Re: [KAT500] 10m Spur

In reply to this post by Willard Myers

I call my shack the aviary so a new birdy didn't shock me. This one did come along with the KAT500. Unplug it and it goes away. P3 screen scrape here: http://www.flickr.com/photos/ak5x/8495386811/in/photostream
73,
Bill

On Feb 21, 2013, at 11:05 AM, K1GQ wrote:

Bill Hammond
[hidden email]
Bill Hammond-AK5X
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K3 #69
P3 #817
KPA500 # 149
K2/100 #4637
K1 #2033
KX1 #1023
KX3 #583
W2
T1

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k6dgw

Re: [KAT500] 10m Spur

On 2/21/2013 2:36 PM, Bill Hammond wrote:
> I call my shack the aviary so a new birdy didn't shock me. This one
> did come along with the KAT500. Unplug it and it goes away.

Until this thread showed up on the list, I hadn't noticed it. We're in
a semi-rural area [no cable, no DSL, no sewer, a well] and I host the
Wireless company's RAP for the neighborhood at the top of my tower.
When it went up, a variety of very weak stable signals showed up. There
are 3 radios up there [one for neighborhood distribution and two for
backhaul], and I'm sure they're all contributory with local oscillators,
clocks, and the like. KAT500 has a controller which has a clock.

Surprising, I don't interfere with any of the RAP, it's just below the
tribander and next to the vertex of my sloping Vee. 500W does nothing
to it. The good news is that in return for tower space and us powering
it up a CAT5 cable, we get free I'net directly off the backhaul [~12
mbps] :-)

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org

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N5GE

Re: [KAT500] 10m Spur

In reply to this post by John_N1JM

On my p3 with the KAT500 tuned to 28.004434 the birdie is -95 dBm.
when I turn the KPA500 off it is still there at -110 dBm.

In my opinion that indicates the birdie is from the K3. When I turn
my 4 el Yagi-Uda to the south which puts the antenna 40 ft above and
30 ft North of the tower the signal rises to -112 dBm, also
indicating the signal is from the K3.

There is another weak birdie at 28.000388 that is -105 dBm. this one
completely disappears when power is removed.

73,
Tom
Amateur Radio Operator N5GE
ARRL Lifetime Member
QCWA Lifetime Member

On Thu, 21 Feb 2013 14:01:25 -0800 (PST), John_N1JM
<[hidden email]> wrote:

>For me it is there but doesn't move the S-meter. I can barely see it on the
>P3 or SDR-IQ/SV.
>
>73, John N1JM
>
>
>Willard Myers wrote
>> Mine generates a clean S4 carrier at 28.004.55. Does anyone else see this,
>> or know how to move it out of the band?
>>
>> Bill, K1GQ
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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>>
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>
>
>
>
>
>-----
>73, John N1JM
>K3 #5986
>P3 #1752
>KPA500 #596
>KAT #575
>KX3 #926
>XG3
>XG1

Amateur Radio Operator N5GE