On 5/14/2014 5:56 PM, Stuart Rohre wrote:
Some Yaecomwoods do suffer from RF entering the rig.
MOST ANY rig will if you have a bad shield connection on coax jumper,
or have rig too close to the antenna, (second floor shack), and there
are many other rig and feedline issues to rule out in any RFI case.
True, can be many causes, but I am in a basement shack. Also, a few
years ago, I used a Drake TR-7 on SSB with everything else the same and
it worked fine. However, I realize that the TR-7 was not as
"computerized" (dependent on microprocessors) as the Omni VI.
Rule of thumb: Power all equipment from same circuit breaker of the
house. That ensures AC grounds will not be coming from widely
different locations. IF you have to use a long ground wire for
lightning protection ground on the station (like from second floor
shack), consider that it could act as an "antenna" for pick up of RF
from the real antenna. You may need tuned radials, or a radial for
each favorite band.
Good tip and I believe I am on the same breaker for all the ham
equipment. Again, a basement shack and 5 or 6 feet of a single 3/4 inch
wide braid from the ground of each piece of equipment to the ground rod
right on the outside of the basement wall.
You could always examine the quality of the grounding of the mike
cable shield. Some older mike cords had just a multi-strand wire
wrapped in one direction and not a hatch pattern wire shield. Some
aluminum foil shields don't make a good low impedance connection by
clamping. (Connections that can't be soldered are suspect).
Should have mentioned this earlier, but back in the day before I used
any computer interface, I had the problem with both a TT 705(?) mic and
a Heil Pro headset. Probably unlikely that both were defective.
73,
Carter K8VT
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