Gwen,
First of all, a T200-2 is an iron core toroid, not ferrite, and is not
likely to prevent much RF noise coupling. Any ferrite core will have an
FTxxx diameter designation with two digits after the hyphen.
That W3EDP antenna is a strong suspect, as is any off-center fed antenna
or end fed antenna. They can produce large amounts of RF in the shack.
Install a GOOD current mode choke near the antenna feedpoint. One of
the best is a stack of 4 or 5 FT240-31 with the coax wound for 4 or 5
turns through the center. That should be placed close to the antenna
end of the coax - exception, an end-fed antenna may need to use a part
of the coax as a counterpoise (which is why a minimum length of coax is
specified for them) - put the choke that minimum length away from the
antenna.
73,
Don W3FPR
On 9/1/2018 11:00 PM, Gwen Patton wrote:
This happens very rarely for me EXCEPT for 30 meters. Then it happens so
much, it makes data modes (CW, RTTY, PSK) useless. I'm using a wired USB
keyboard connected to the PX3. If I'm on 30 meters, and I use the ATU to
match the antenna, transmitting any data mode causes extra, spurious
characters to be added onto the end of the keyboard input buffer. In some
circumstances, it starts appending additional messages stored in message
slots mapped to function keys.
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