[Elecraft] KPA1500 RFI on 10 Meters

[K8TE]

My finding was similar to Scott's.  I noticed between one and two S-units
increase in noise on a 10m dipole located within 40 ft. of the shack.  I
also noticed the same on 15m with a 40m dipole at the same distance.  I
added type 31 ferrite snap-on cores to the 240 VAC, the "high" DC voltage,
and control lines at the power supply.  Now, the noise is back to the
ambient level which is still too high.

Now I can copy another level or two of signals I couldn't copy as well prior
to adding the ferrite cores.  BTW, that previous level of noise disappeared
when I powered the amplifier down and not the PSU.

73, Bill, K8TE



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