User's Manual | ACOM 2020S | 1.8-54 MHz Linear Power Amplifier
June 2022
S e c t i o n FIRST POWER-ON, CONTROL SYSTEM, AND INITIAL CHECK | Page 37 of 76
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To reduce the RF impedance of the grounding connections sheet metal stripes instead of
flexible braids are preferred;
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Thread ferrite beads or snap-in ferrites with medium permeability (800-4000) over the power
cord, the feeder and the signal cables leading to the affected devices (TV, etc.); besides the
size, consider the frequency range in which the offered ferrites are effective - normally they
are optimized for suppression of interferences on HF (with larger permeability), with medium
permeability for HF-VHF or with low permeability - only the VHF range. The latter are
ineffective for HF;
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Whenever possible use shielded cables and ground their shields at both ends;
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The addition of even quite simple low pass L/C or R/C filters directly to the disturbed inputs or
outputs of the devices is very effective, provided it is practically applicable.
Last but not least, bear in mind that the benefit of the above measures is two-fold.
Firstly - they reduce the interferences from your transmissions to the ambient environment and secondly -
they reduce the background noise floor for your reception.
Practically, with no great efforts, implementing the above measures, you can reduce the receive
background noise floor with one or more S-units across the different bands. This will allow you not to miss
weaker stations, which will hear you because of your increased transmission power.
And third, but very important: the EMI environment at your station will become safer for you and those
close to you.