What's wrong is the better cable is RS.
----- Original Message -----
From: "Ken Brown" <ken.d.brown@verizon.net>
To: <tentec@contesting.com>
Sent: Monday, September 22, 2003 21:41
Subject: [TenTec] Interesting problem and solution
> Hi All,
>
> I have an Omni VI and a Titan. I recently changed the key out to tx
> enable cable to what I thought was a better cable, even though it was
> working fine. The origninal cable, that worked, was just a plain ten
> foot long skinny stereo audio phono plug to phono plug cable ( using
> only half of the cable ) and the "better" cable is a six foot Radio
> Shack "Gold Series" Audio/Video cable, which appears to be made from 75
> ohm coax.
>
> With the "better" cable on 160 meters the transmitter would lock up
> whenever the amplifier was putting out more than 500 watts. The watt
> meter would indicate power output, and the side tone was gone, unless I
> continued to intentionally key the transmitter. Reducing drive from the
> Omni, or detuning the amplifier to reduce output to below about 500
> watts, would unlock the system. Same thing either to a good dummy load
> or to an antenna.
>
> Putting back the cheapo, skinny, longer cable made the problem go away.
> At one point I tried a couple of turns of the "better" cable through a
> split ferrite core. That did not fix it.
>
> I'm sticking with the cable that works for now. I am interested in
> opinions about what is wrong with the "better" cable. Lower capacitance?
> Would some additional bypass capacitors on the tx enable in the Omni
> make it work with either cable? I have the amplifer and radio grounds
> connected with RG-8 outer sheild braid, and am using 1/4 inch Andrew
> Superflex Heliax between the Omni and the Titan. It did the same thing
> with RG-58. I just used the overkill heliax cable just because it was
handy.
>
> Thanks,
>
> Ken N6KB
>
>
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