I don't have a guess as to the cause, but it might be worth trying a
common mode choke at the base of the vertical. I know that some of these
antennas (like the Cushcraft/MFJ versions) do have such chokes built in,
but I found that an additional one helped isolate the line from the antenna.
Lovely prose, Mr. Wayne. Very nicely put - best post so far this year
- especially the suggestion we invite other ops to call CQ as we move up
the bands !!
Happy trails, OM. K8JHR
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That's the strange thing about this. It doesn't have a grinding sound
or anything other than a clean carrier. Actually two carriers, the
weaker one about 150 Hz lower than the main one. That pretty much rules
out any kind of switching power supply, for example.
Maybe tomorrow I'll take my
I also had power line interference on 7MHz. Made a shielded loop using a
Hula hoop as support, BL2 for balanced loop to coax, and KX3 receiver.
Didn't take long to DF it out.
John KN5L
On 6/7/22 8:36 PM, Alan Bloom wrote:
> Hi John,
>
> In this case the Internet is not via DSL, it's via cable.
He builds his own radios with Direct Digital Synthesis out of discrete
components.
His synthesizers have no detectable jitter or phase noise.
The NIST adjusts WWV to his transmissions.
He is...the most interesting ham in the world.
73, Nate, N0NB
--
"The optimist proclaims that we live in
and I have an Ebay special GPSDO, which is ridiculously accurate.
But I
don't know how pure it is.
- Jerry KF6VB
On 2022-06-07 17:14, Wes wrote:
Sure, but how do you quantify the "relatively pure" source if you
build one? Typically you want it to be 10 dB better than
Hi John,
In this case the Internet is not via DSL, it's via cable. The coax
comes out of the ground and then to the modem/router and from there via
a 150-foot Ethernet LAN cable to the granny unit, where there is an
additional router with its own Wi-Fi.
Anyway, that entire system was
On 40M I see noise every 15 kHz. It's constant. Sometimes stronger,
sometimes
weaker, but it's always there. The pattern is obvious on the waterfall
display.
When I tune in one of the peaks, it sounds like a rhythmic grinding.
- Jerry KF6VB
On 2022-06-07 16:59, Alan Bloom
Hi Alan,
I've had issues with the service from street to modem. As I understand,
there's a VDSL band which overlaps 7MHz band.
In my case, it was reversed, any transmission on 7MHz would disable TV
and Internet service.
John KN5L
On 6/7/22 7:54 PM, Alan Bloom wrote:
> The ISP is TDS. They
The ISP is TDS. They offer up to 1 Gbps internet (I only pay for 200
Mbps) via cable.
Just as a sanity check, I just walked down to the main house and
unplugged the 150-foot LAN cable from the modem/router that feeds the
router in the granny unit here where the shack is. As expected, the
Hi Alan,
What is your TV/Internet provider?
John KN5L
On 6/7/22 6:59 PM, Alan Bloom wrote:
> The weird thing about these spurs is how clean and stable they are.
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Sure, but how do you quantify the "relatively pure" source if you build one?
Typically you want it to be 10 dB better than what you are measuring (or the
measuring instrument).
The other option is a commercial source with published specs. For example I
have an ebay special Morion MV89 10
The weird thing about these spurs is how clean and stable they are.
Switching power supply noise is generally not frequency-stable and it is
not a clean CW carrier. This one is actually TWO clean carriers,
separated by about 150 Hz.
Alan N1AL
On 6/7/22 17:43, Fred Jensen wrote:
I did the
Yes, the modem router and a second router in the granny unit both run on
AC power, so they were off. There is no wired LAN to either the
computer or the K4 -- both connect to the Internet via Wi-Fi.
Alan N1AL
On 6/7/22 17:41, Ron wrote:
Sounds like wired LAN noise. Did you shut down your
I did the "Main Breaker 2-Step" and nothing went away. My noise on 80
and 40 on the K3/P3 is highly varied ...
1. Narrow discrete carriers [that appear linked, 25-35 kHz apart] come
and go, sometimes within seconds
2. Broad [5-10 kHz] bands of noise, often without any harmonic brethren
As part of christening my new QTH/antenna/rig here at N1AL, today I did
the test where I recorded all off-the-air spurious signals on all bands
and then threw the main circuit breaker for the house and did the
measurement again, powering the K4 from a battery. This is to identify
any spurs
That is one of the reasons I am not going the nanoVNA route... I
suspect the P3 is a far better measurement tool.
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 6/7/22 15:07, Jim
On 6/7/2022 1:56 PM, Wes wrote:
But...what you measure are the results of phase fluctuations in the DUT
*plus* the phase fluctuations in the measurement system's oscillators
and/or sampling clock jitter. This is the K3/P3.
Yes
73, Jim K9YC
Jim,
Thanks for your answer! Also, thanks for your past work!!
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 6/7/22 12:13, Jim Brown wrote:
On 6/7/2022 8:04 AM, Dave (NK7Z)
On 2022-06-07 13:56, Wes wrote:
*plus* the phase
fluctuations in the measurement system's oscillators and/or sampling
clock jitter. This is the K3/P3.
*** I wonder if the noise of the K3/P3 could be measured using a
relatively pure
signal source - then once that's known, you would subtract
KV5J's line of Digital Displays for Elecraft's W2, KXPA100, KPA500, KAT500 and
KPA1500
Digital Display Unit for Elecraft's KPA500 amplifier:
-
-
WITH REPAIR COST AND DOWN TIME FOR REPAIRS, THIS WILL KEEP YOU INFORMED OF HOW
YOUR AMP IS DOING.
-
-
Instead of seeing only 1 crucial reading,
I can't answer the first two and Al has given the answer to the third.
But, you're not going to be measuring phase noise in the strictest sense, but
what ARRL calls composite-noise. Interesting they *do* actually measure phase
noise with an HP11848 Phase noise test set and then they assume
My dad W8ZEQ was also a stamp collector.
When the band was open in ‘57 he worked I1FT/Egone a few times. He introduced
him to his neighbor Alvase another stamp collector. For over a decade envelopes
of US and Italian stamps crossed the oceans, stamps on the inside and outside
faithfully
I can certainly relate to the parallels. I’ve been US stamp collected (and now
online dealer) since age eight. My collection now is at the point where adding
just about any stamp to a blank spot could run close to what it would take to
buy a used car. Thus, the poor collection is opened only
Amen and Amen.
K9ZTV
On 6/7/2022 12:21 PM, Wayne Burdick wrote:
... if you get tired of collecting stamps, let's say with your VFO parked at
14.074 MHz, wander up or down the band and take a crack at doing things the
hard way ... and*/pound some old brass/*.
On 6/7/2022 8:04 AM, Dave (NK7Z) wrote:
Thanks in advance for any help in this...
I use a P3/SVGA to measure signal bandwidth (and before I had the SVGA
board, used the P3). It's dynamic range is 100 dB, but the screen can
display only 80 dB. A rig with decent phase noise performance is well
Beautiful piece. Thanks for sharing.
On Tue, Jun 7, 2022 at 1:22 PM Wayne Burdick wrote:
> During my childhood, I watched my dad indulge his hobby: collecting stamps.
>
> Most of the time his collection hibernated in two large photo albums on a
> shelf in the family room, seemingly forgotten.
Wayne,
Very interesting perspective. I'm finishing 7 days in Yosemite NP today!
Many things to see and places to go! I did manage to make a little time to
play radio. My KX3 makes portable operation easy. I'm always shocked on
these outings away from sources of man made noise at what I can
On 6/7/22 10:21 AM, Wayne Burdick wrote:
One album held foreign stamps, the other domestic. I'd admire their colors and
artwork. Sometimes I'd ask him questions about their monarchs, palaces, and
currency denominations. But Dad seemed most interested in the fact that they
were each slightly
During my childhood, I watched my dad indulge his hobby: collecting stamps.
Most of the time his collection hibernated in two large photo albums on a shelf
in the family room, seemingly forgotten.
Then once a month, by prior arrangement, he'd receive a package of envelopes
and postcards in
Al,
THANK YOU Also, thanks for the formula! :)
73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources
On 6/7/22 08:18, Al Lorona wrote:
According to Al, N1AL, "The effective bandwidth
According to Al, N1AL, "The effective bandwidth of the P3 is approximately one
pixel on the display, which is SPAN/468. So, for example, if the span is 47
kHz, the effective bandwidth is about 100 Hz."
To "convert" or "correct" to a 1 Hz bandwidth, use the formula:
BW_correction_factor = 10 *
Hi,
I am contemplating practicing some phase noise measurements using a P3.
If I correctly understand the measurement, (which I may not), I should
express the result, using db down from peak, so many Hz away from peak,
using a 1 Hz width.
First question; is the above correct?
Second
How much deflection do you see on the ALC meter? Need to check out the
settings on the sound card, the mike level on the rig and in WSJT-X. Also
the settings under the Sound settings/Advanced settings/ app settings to be
sure the source is set to the correct device. And Windows updates like to
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