There are many possible flaws with these.
Some times it happens so making the wires has gone unshielded and
straight wires.
Then just twisting the cables together may fix the EMI problems.
Not making a twisted pair, but a twisted bunch.
Remember to twist the bunch into one direction only; not a
bi-directional bunch as it will be as good as a bunch of straight
wires.
After that, you take smap-ons, wire cutters or capacitors for the
problem solving.
73,
Jukka OH6LI
2012/11/7 J.D. "Dan" Weisenburger <kw4t@comcast.net>:
> Along time ago I had a similar problem with LPT1. There were two grounds
> causing a ground loop at some frequencies (actually gound loop was always
> there) while others were clear. I made it a "Single" ground and all was
> well
>
> 73 from Lake Moneysgone, Dan, KW4T
>
> On 11/6/2012 5:57 PM, Tom W8JI wrote:
>>>
>>> Thank you to all who responded. Just to clarify...I have no RFI problems
>>> running 1kw on ssb. On cw, I have no rfi problems on 160,80,40m,20 or 10m as
>>> long as I use the monobanders. The problem manifests itself on 15m and when
>>> I use the TH6DXX. Normal day to day logging is done with DX4WIN and no
>>> problems.My conclusion is that I am getting RFI through the LPT1 cable. I
>>> will get some 31 mix cores and hopefully cure this annoying probllem.
>>>
>>
>>
>> How far is the TX6 from the shack compared to other antennas?
>>
>> Do you have a balun on it, and what type, and is the coax grounded at an
>> entrance panel or anyplace?
>>
>> 73 Tom
>> _______________________________________________
>> CQ-Contest mailing list
>> CQ-Contest@contesting.com
>> http://lists.contesting.com/mailman/listinfo/cq-contest
>>
>
> _______________________________________________
> CQ-Contest mailing list
> CQ-Contest@contesting.com
> http://lists.contesting.com/mailman/listinfo/cq-contest
_______________________________________________
CQ-Contest mailing list
CQ-Contest@contesting.com
http://lists.contesting.com/mailman/listinfo/cq-contest
|