> One possiblility might be that you are using a parallel port and have
> ptt enabled in TR. In that case, the strobe line which is connected to
> the keyer transistor emitter will be pulled low during the whole
> transmission making the keyer transistor more susceptible to rf. If you
> set ptt enable = false with the control-j menu, the strobe line gets
> keyed along with the cw line that is connected to the transistor base.
> If CT keys both lines by default that would explain the difference.
>
> On the other hand, I may be completely wrong.
No Kevin -
I believe this is exactly the situation, and I think there is even
one case where someone "fixed" their problem by changing the
PTT ENABLE.
However, root cause is still RF and proper bypassing/shielding
should eliminate the problem. My extensive field testing includes
operations at 4U1ITU, EA9IE, F/N6TR (with the dipole 15 feet above
the roof), TI1C, W5WMU and at home. I have never had any problems,
or if I did they were so easy to cure, I don't remember them.
73 Tree N6TR
tree@contesting.com
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