[TenTec] Eagle problem?

[Stuart Rohre]

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.

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.

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).

You can do a step by step analysis of grounding, by starting at the mike 
element and measure the resistance by ohm meter, of shield connection to 
plug pin/ shell.  Use a magnifier to examine connections on inside of 
radio at mike.  Check case to mike jack shell if that type.

Some radios have a thru bolt to provide a "ground" terminal on back of 
set.  Make sure this bolt if present, grounds tightly to the chassis.

Same could be said for any stud grounds on external tuner, etc.

Good Luck, but usually a step by step exam of all connection points will 
show up issues.  Avoid feedlines that are odd multiples of a quarter 
wavelength.  Add 5 feet to a line to check for those types of issues.

It used to be a common problem if the ring on mike connectors was not 
fully tight on the mike jack. That is less of a problem, if the mike 
ground carries through a mike pin.

Let us know what you do to fix the problem.

Stuart Rohre
K5KVH