[RFI] MFJ 75 amp switcher.

[K1TTT]

Watch it on the panadapter then unplug the load and see if you can see it
sweep up or down in frequency.... its probably somewhere  out of the band
when unloaded.  Also try putting a fan on it when it is loaded and see if it
moves, sometimes they are temperature sensitive.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net


-----Original Message-----
From: W4ATK [mailto:w4atk at bellsouth.net] 
Sent: Sunday, March 11, 2012 14:17
To: rfi at contesting.com
Subject: [RFI] MFJ 75 amp switcher.

Before purchasing this unit I asked Steven Pan of MFJ if this unit was
quiet. I was assured no problem.

Well I soon noticed a very raunchy signal that moved about the 20 meter band
and eventually settled in about 14.070 MHz. Wonderful, as I enjoy PSK and
the other digital modes.

The strange thing is, I cannot detect the noise if the switcher is on but
not connected to any load. Once I plug it in to the power strip, then the
signal shows up on the P3 panadapter and in the receive audio.

I believe it is being propagated over the power cabling and intend to try
some clamp on ferries. Any other suggestions gratefully received.

Jim, W4ATK


Sent from my iPad

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