[Elecraft] K3 TVI on 40 meters only

Mike Flowers mike.flowers at gmail.com
Fri Aug 25 22:35:05 EDT 2017


I had TVI/internet lockups running a K3 into 80 & 160m wire antennas with U-verse.  AT&T swapped out the modems numerous times, had three different models but no  joy.  Had their 'top techs' on the problem. 

At the time, the 'net was filled with U-verse TVI issues.  Switched to cable and no further problems.  

Lots of folks are using U-verse without a TVI problem, but it never worked very well here.  

-- Mike Flowers, K6MKF, NCDXC - "It's about DX!"

> On Aug 25, 2017, at 4:16 PM, Fred Jensen <k6dgw at foothill.net> wrote:
> 
> Does reducing the power change anything?
> 
> Is there an inherent issue in the K3 which might attribute to this symptom?
> 
> If there is, I'm pretty sure it's never been reported here before.  We have Uverse with 3 TV's via a wireless video bridge and one with a FireStick, and no problems at all on any band at 100 W to an end-fed wire on the back fence.  I do turn a couple of touch lamps on and off Navy-style on 80 and 160, but TV is fine.
> 
> 73,
> 
> Fred ["Skip"] K6DGW
> Sparks NV DM09dn
> Washoe County
> 
>> On 8/25/2017 3:24 PM, Mike Pilgrim wrote:
>> Recently replaced my ic-7600 with a new to me K3.  I don't recall this issue
>> when using the ic7600, but I now have TVI in my u-Verse TVs when using the
>> K3 on 40 meters, primarily on CW, with diminishing evidence on SSB up to
>> 7.2.50 but okay above that.  The symptom is pixilation on the screen, then
>> audio blanks out, and finally the set top box will completely lose signal.
>> This occurs on two TV operating on wireless set top boxes, and two hardwired
>> with CAT-5 cabling.  I have tried on three separate end-fed long wires fed
>> by coax through a 9:1 UNUN, two with feedline length of 100' and the third
>> approximately 60 feet.  I can operate satisfactorily on all bands from160 to
>> 10 Meters with exception of 40 Meters on all three antennas.  The K3 auto
>> tuner indicates 1 bar of SWR with output power anywhere from 10 to 100
>> Watts.  I have also used an external ATU with same results.  I have looked
>> at everything I can think of, including terminating each antenna port with a
>> dummy load, but to no avail.  I've traced out all grounds and coax
>> connections.  Nothing helps.  What might I be overlooking?  Is there an
>> inherent issue in the K3 which might attribute to this symptom?  That seems
>> likely since I don't recall this problem when using the same antennas with
>> the IC-7600.  I welcome any ideas or suggestions for where to look next.
>> 
>> Thanks,
>> 
>> Mike, K5MP
> 
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