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Joined: Wed, Mar 18th 2020, 15:25 Roles: N/A Moderates: N/A

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Weird interference, every 66 Khz Oct 18th 2021, 07:57 6 5,744 on 25/3/22

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balum needed on EFHW? KK4LYQ on 21/1/22
You could use a 9:1 balun, those are common on end fed half wave wires. But you don't need to if your tuner gets to a 1.7:1 match, which really isn't that bad. I am not sure I would use a balun and a tuner. Just out of curiosity, Why end fed and not a dipole? Both an end fed half wave and a dipole require the same height when oriented horizontally. Switching to a dipole configuration will let you eliminate the tuner and the balun, as well as the counterpoise and will give you a much more efficient antenna. You will lose RF energy to heat in either a balun or a tuner. If you have the antenna oriented vertically, you lose radiation efficiency with just a counter poise (as opposed to a robust radial field). I would invest in some coax and turn that wire into a dipole, but that's just me.

Weird interference, every 66 Khz N1LOU on 18/10/21
Is there a way to post pics to this forum? I would love to post up screenshots of the spectrum scope
Weird interference, every 66 Khz N1LOU on 18/10/21
I am noticing this interference on all bands from 10-160. it seems to recur every 66 Khz. It is noticeably absent above 35 Mhz. The amplitude of the interference differs among the bands being more noticeable on some. On 60 Meters it is the worse, and I actually see two different signals on the band, one spaced at 66 Khz and one very square shaped wave every 62 Khz. If I tune one of these signals it comes across as a soft white noise. It's not the worst interference as I can easily tune signals that are not right on top of one of these spikes, and they are actually quite far apart compared to the bandwidth of a typical SSB signal. Has anyone seen this and if so, what is it and how do I get rid of it

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