[Elecraft] K3 TVI on 40 meters only

[John Saxon]

FWIW: I also have Uverse and cannot use 80 or 40 (haven't tried 160).  My research (reading posts from people who know what they are talking about) indicates it is due to subcarrier frequencies used by AT&T - they include frequencies in the 160-80-40m bands, ending around 9mHz.  I can operate 30m (10mHz) just fine.
Here (Pearland, TX) it appears there is fiber to the neighborhood.  However from a break-out to my house is POTS - twisted pair copper.  Another ham stayed on AT&T until they used some sort of shielded cable (not sure what) instead of POTS and problem was solved.
I haven't gotten into AT&Ts face yet, but will.  May very well switch to Comcast that use coax for the feeds.
I am certainly no expert, but have reached these conclusions from corresponding with hams who know a LOT more about this than I, and have experienced the same problem and reached the same conclusion.
73,JohnK5ENQ

From: brian <alsopb at comcast.net>To: elecraft at mailman.qth.net >> 'Elecraft Reflector' <elecraft at mailman.qth.net>Sent: Saturday, August 26, 2017, 7:16:08 AM CDTSubject: Re: [Elecraft] K3 TVI on 40 meters only
John,

Very informative.  I intend to throw it in the face of the next AT&T 
salesman that comes knocking on my door.  We get one every couple months.

It is especially true that they lie about now being pure fiber to the 
house.  I ask them how they installed fiber without having sent out a 
machine to route it.

Not mentioned is the RFI that their modems can generate.  Reading the 
article confirms that it is almost a given-- especially for those with 
overhead utilities.

73 de Brian/K3KO



On 8/26/2017 10:21 AM, John Oppenheimer wrote:
> May find some information about the issue here:
> http://adslm.dohrenburg.net/uverse/
>
> It will depend on which VSDL frequency is being used by the modem. My
> modem seemed to pick the high end of 40 meters most of the time.
>
> John KN5L
>
> On 08/25/2017 09:16 PM, Jim Brown wrote:
>> I can't think of a mechanism whereby ANY ham rig could be the CAUSE of
>> interference to cable TV or DSL.
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