[Elecraft] Monitor noise

[k6se@juno.com]

John, KI6WX wrote:

"The one other method of attacking the problem is to determine if it is
coupling in at the antenna or the transmission line.  If you disconnect
the transmission line at the antenna end, does the level decrease or stay
the same.  If it decreases, the energy is coming in via the antenna and
the only way to reduce it is to locate the antenna further away.  If it
stays the same, disconnect the coax from the receiver.  If it decreases,
the  noise is entering by the coax.  This can sometimes be reduced by
putting a common mode choke on the coax."
==========
John is absolutely right.  Magnetic fields do not radiate very far, so
virtually all birdies that you hear that are generated by the computer
monitor are picked up either by the receiving antenna if it is closeby or
by the feedline if it is poorly matched and has common mode currents on
it.

There's not too much more that you can do than what he suggests.

73, de Earl, K6SE
74 countries with K2 #2622 and counting.....