[Elecraft] Xfinity interference

[donw4cbs]

Eric,  just went through the same thing here in Florida with Xfinity. They 
showed up claiming I was taking out a large area (10 block square) on their 
spectrum analyzer. Mine showed up on 16 Mhz up when I operated any band on any 
of 4 antennas. I was using my K3 KPA 500 combo. I worked with them over 3 
months giving them ideas and suggestions but I was adamant it was there problem 
not mine. By the way I wasn't getting into my TV or internet nor any of my 
neighbors. They checked their lines for leakage, and even ran new burried cable 
to me but it still didn't fix it. I suggested they check their ground wire 
going up their pole in an easement behind my house. Bingo!!!  They had a ground 
rod at the foot of the pole and a 30 foot wire running up the pole but they 
never had connected it. I have since learned from a local ham friend who was an 
inspector involved in several court cases with Xfinity over on our east coast 
here in Florida, that this is common procedure for them. We are in the 
lightning capital of North America and they, according to him, were trying to 
avoid lightning strikes to their equipment. Lightning was hitting the power 
company equipment instead.If you would like to contact the man who won in court 
in these cases contact me at my call at arrl.net and I will give you his 
contact info.Don, W4CBS Sent from my Sprint Samsung Galaxy S20+ 5G.
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[Elecraft] K6XX SMD Visible LED CW Tuning Indicator

[edward kacura via Elecraft]

Does anyone have one of these they’d like to part with, either built or still 
in kit form for the KX1 ?You can’t get this anymore, the two gentleman, Tom, 
N0SS and Ron, WB3AAL who sold the kits are SK.Contact me off line at 
ekac...@yahoo.com.
Thanks and 72/73Ed KacuraN7EDK 

Sent from Yahoo Mail for iPad
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[Elecraft] Two XV222 Transverters for Sale

[Mike Cizek W0VTT]

Greetings,

 

I have two Elecraft XV222 transverters for sale.  Both have original manuals
and have the crystal oven installed.  Both are set up to work with 1mW drive
from a K3, and both meet factory specs, according to my older but still
pretty good test gear.  Prices include shipping in the USA.   Pictures
available on request.

 

XV222 #1 - very well built, works properly, includes the bypass capacitor
change (Builder's alert 30 APR 2009)  $350

 

VW222 #2 - works OK most of the time, but looks just awful inside.  Whoever
built this one had no business ever picking up a soldering iron.  It's fine
for casual SSB and CW operating, but not stable enough for digi modes.  $225

 

Also - M Squared 222-5WL Yagi.  15 elements on a 24' boom.  In good shape
with all new fasteners.  $150 picked up in southeastern MN, or we can talk
about shipping.

 

Thank you.

 



73,

Mike Cizek W0VTT

 

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Re: [Elecraft] HELP! XFINITY SHUT OFF INTERNET DUE TO HAM ANTENNAS

[Eric Swartz]

Folks, we are exceeding the OT limit for list postings on this topic.
[THREAD CLOSED]

Please take the discussion off list in the interest of relieving email
overload for others.

73,
Eric  WA6HHQ
List moderator, among other things..
*elecraft.com *



>
>
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Re: [Elecraft] Through-hole Replacement for K3 Q5 (2N7002)

[Russ Tobolic via Elecraft]

 Hello Pete:
I have some thru-hole 2N7000 in my junk box.  I can mail a couple to you if you 
want.
Russ, N3CO
On Thursday, October 21, 2021, 09:57:50 AM EDT, Pete Smith N4ZR 
 wrote:  
 
 The original surface-mount part seems to be back in stock in the US, but 
I'm afraid that what I need is a through-hole equivalent, because the PC 
board where the old one was mounted is a wreck (damage from part 
failure, plus my ham-handed efforts to replace it). Google thinks a 
2N7000 will do, but I'd sure like to get an expert opinion.

-- 
73, Pete N4ZR
Check out the new Reverse Beacon Network
web server at .
For spots, please use your favorite
"retail" DX cluster.

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Re: [Elecraft] OT; large ferrite toroid core?

[Louandzip via Elecraft]

 A nanoVNA is an incredibly capable, versatile, and inexpensive instrument 
(<$100) that can make these measurements when using proper technique and 
analysis.  They also work great as graphical antenna analyzers. 

Lou W7HV

On Friday, October 22, 2021, 05:52:20 AM MDT, John Oppenheimer 
 wrote:  
 
 Hi Mike,

Initial permeability can be computed from your values:

Compute 4T permeability=1 (Lo) using core dimensions:
Lo = 0.0004606 * Log10(OD / ID) * Ht * Turns^2 (Ht in mm)
Lo = 0.0004606 * Log10(6 / 2.6) * 14.3 * 16 = 0.0383uH (Ht in mm)
Initial Permeability ui = 6.6 / 0.0383 = 172

Fair-Rite 61 material ui = 125, 52 material ui = 250. If characteristics
are close to 61 or 52 material, then could use it for an HF Choke Balun.

Complex permeability can be plotted out to 20 to 30 MHz range using a
single port VNA. Do you have a VNA? I can walk your through the process
if wanted.

John KN5L


On 10/21/21 1:24 PM, Mike Maloney wrote:
> We were gifted a somewhat large (6"OD, 2.6" ID, 9/16" thick) ferrite core of 
> unknown mix and original use.   On face was marked 6.6uH w/4turns.   My 
> thinking it might make a good common mode RF choke on the output of an 
> inverter generator or on coax feedline.    Not familiar with properties of 
> toroid cores of this size.   Any ideas?
> 73, Mike AC5P
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Re: [Elecraft] OT; large ferrite toroid core?

[John Oppenheimer]

Hi Mike,

Initial permeability can be computed from your values:

Compute 4T permeability=1 (Lo) using core dimensions:
Lo = 0.0004606 * Log10(OD / ID) * Ht * Turns^2 (Ht in mm)
Lo = 0.0004606 * Log10(6 / 2.6) * 14.3 * 16 = 0.0383uH (Ht in mm)
Initial Permeability ui = 6.6 / 0.0383 = 172

Fair-Rite 61 material ui = 125, 52 material ui = 250. If characteristics
are close to 61 or 52 material, then could use it for an HF Choke Balun.

Complex permeability can be plotted out to 20 to 30 MHz range using a
single port VNA. Do you have a VNA? I can walk your through the process
if wanted.

John KN5L


On 10/21/21 1:24 PM, Mike Maloney wrote:
> We were gifted a somewhat large (6"OD, 2.6" ID, 9/16" thick) ferrite core of 
> unknown mix and original use.   On face was marked 6.6uH w/4turns.   My 
> thinking it might make a good common mode RF choke on the output of an 
> inverter generator or on coax feedline.    Not familiar with properties of 
> toroid cores of this size.   Any ideas?
> 73, Mike AC5P
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Re: [Elecraft] HELP! XFINITY SHUT OFF INTERNET DUE TO HAM ANTENNAS

[Geert Jan de Groot]

I do apologize for contributing to this off-topic thread...

A technical issue for cable modems is the uplink.
For downlink, the cable modem system uses one or more "TV channels to 
sends its data on. There is encoding and all that but the signal isn't 
un-like a TV channel.


The uplink is where the problem lies.

Cable modems typically use low frequencies (up to 50 MHz or so) to 
transmit their packets from the enduser modem to the headend. You'd need 
a channel bandwith of 8 MHz or so. Where does a cable operator find a 
clean 8MHz channel under 50 MHz?


Keep in mind that the ingress signal (from the enduser to the headend) 
collects all the RF leakages from the environment. All poor cabling 
together creates a massive reception antenna. And a single strong 
carrier in the channel may block it.
I had a chance to see the upstream spectrum ("ingress signals") and it 
was not a pretty sight.
I know that one local cable operator had to change channels because in 
the evening, strong shortwave broadcast signals leaking in were blocking 
the ingress channel of the cable-TV modems.


For this reason, the ingress system, in the DOCSYS system I looked at, 
was using direct-sequence spread spectrum (DSSS) to "smear" these 
carriers over the spectrum and reduce their impact.


Now, consider very strong carriers on the ingress. Carriers so strong 
that the conversion gain of the DSSS system doesn't help enough. In that 
case, the ingress channel is still fully blocked despite the DSSS measures.


What impact things a lot, of course, is leakly cabling. And from what I 
hear, American cable-TV systems have lots of leakage issues (here in 
PA0, cable systems are underground and are shielded very, very well; any 
leakage here is typically poor enduser cabling).


While the response of the tech is very wrong, perhaps the above explains 
a bit what is happening and the reason for his reaction. If it were me, 
I would see if things can be solved along these lines, considering that 
from what I read in QST, many USA cable-TV systems have a massive, 
massive leaking problem.


In the Netherlands, more and more spectrum is being moved from 
"broadcast TV" / cable-TV to mobile services. Cable-TV signals are now 
on frequencies that are also used by mobile phone users, with 
transmitters (handies) on short distance and hence strong signals.
Suddenly the jammers are not us pesky hamradio guys, but every person 
carrying a mobile phone. And the community now understands that the 
proper fix for this is not banishing the mobiles, but better cabling.
For cable-TV, there are now "kabelkeur" (www.kabelkeur.nl) qualified 
cables that have double shielding, and, more important, good connectors, 
connectors that frankly put the typical hamradio RF connector to shame.


And I wonder how this compares to the situation of the topic starter.
With emotions running high we won't get anywhere, but I hope the local 
ARRL community can step in, find out if my hypothesis is the root issue 
and work from there, considering that proper shielding is a CATV 
operator issue and no-one else's.


73,

Geert Jan PE1HZG
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