[Elecraft] K3 TVI on 40 meters only

[Fred Jensen]

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