On Tue,10/20/2015 9:45 AM, Bob McGraw - K4TAX wrote:
See http://www.dj0ip.de/antennas/ <http://www.dj0ip.de/antennas/> for
further info on baluns, common mode chokes and OCFD antennas.
On EQ, I suggest setting TX EQ: 50 Hz @ -16 dB, 100 Hz @ -12 Db, 200
Hz @ -6 dB with the remainder at 0 dB.
Bob,
John's at P40 for contesting, so he will want the more aggressive low
cut that I've suggested. Also, he's dealing with real antennas, not OFCD. :)
As to the RFI possibility -- it may not be RFI at all, but rather a DC
power related issue that SOUNDS like RFI. W8JI first told me about this.
John -- do you have an outboard box that is powered from the same 12V
power supply as your rig, feeding TX audio to your rig? If so, what you
can be hearing is modulation of the IR drop on the black wire, which
sounds like SSB on an AM detector. If you stick headphones between the
two ends of the black wire running between the power supply and the
transceiver, you'll hear it.
Some easy solutions, depending on your setup and resources. First, bond
chassis-to-chassis of all interconnected boxes with short, fat copper.
Second, get power for the audio accessory either from it's own wall
wart, or from the transceiver end of the dc cable that feeds the
transceiver.
73, Jim K9YC
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