Hi Billy...
It's common for the 50-60 Hz field of a transceiver or amp power
transformer
to cause ripple and distortion on a magnetically-unshielded CRT nearby. .
Severity depends on multiple factors including transformer configuration
and orientation, distance from CRT, shielding effect of equipment cabinets,
and any special magnetic shielding of the CRT (e.g., "mu-metal."
Transformer field(s) also introduce ac hum into nearby (same room) dynamic
microphones. Severity depends on the same factors as above. If the mike
MUST be close to the equipment, such hum pickup may be most easily fixable
by changing to a non-magnetic type of mike such as condenser or
piezoelectric (crystal).
73, Dick W0ID
-----Original Message-----
From: Billy W. Cox Jr., AA4NU [SMTP:aa4nu@ix.netcom.com]
Sent: Sunday, February 14, 1999 11:36 PM
To: amps@contesting.com
Subject: [AMPS] Cure for "Monitor Ripple" from Amp's PS ?
Hi !
Moved some things around in the station
recently, and noticed now that with the amp
ABOVE the monitor, there is a "ripple"
or "jumpiness" now when the amp is on.
Any proven "cures" for this ? Amp is an
AL-1200 and the monitor is a real IBM
VGA 8513 ... From the bottom of the amp
to the very top of the monitor case is 2 - 3"...
See many pictures with other setups,
and their spacing appears to be much
close than what I am using, so perhaps
there is an easy/simple solution.
Sorry for such a "basic" question, but I
know someone else has been down
this road before ... this should be an
easy one, compared to the recent topics.
Thanks, and have a great week !
73 Billy AA4NU
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