Got a car battery you can try for power (just to eliminate the PS)? I've seen RF do some odd things with switching supplies.
Got a car battery you can try for power (just to eliminate the PS)? I've seen RF do some odd things with switching supplies.
Plug the power supply directly into the wall. No surge suppressor, no UPS, nothing. See what happens.Originally Posted by KC2UGV
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Going to try these out tonight (Remove the UPS, and try to get a coil near the feedpoint).
An old Pyramid would be a linear PS not a switcher. I have 2 of the 25A models I've used for years.
FWIW, if everyone used 20W for psk on 20m the whole world would be a kinder, gentler place. ;)
The coil choke mentioned earlier couldn't hurt. Fixed a similar problem on 40m for me a while back.
Have you tried 15m? the 40m section should tune reasonably well on 15 too.
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If it's linear, RF in the PS probably isn't the issue.
Corey: Is it small and light, or big and heavy?
Big and heavy.If it's linear, RF in the PS probably isn't the issue.
Corey: Is it small and light, or big and heavy?
In the process of getting the UPS out of the loop, to cut down on the chance of my RF ground being the power lines right now.
Got some ferrite? Get some clip on beads for the coax. Add beads from the connector at the radio until the RF feedback is gone. Since you're not using a balun, do the same stating at the feed point and work down the coax until the problem is gone.
Unless you've run a separate ground, you're AC power line IS your RF ground.
I think I figured it out.
My MFJ analyzer (MFJ-209) is not calibrated correctly for 14MHz. The dial is almost 1 MHz off! So, my antenna shows a perfect match for 14MHz on the dial, however, in reality, on 14.070 if 15MHz on it's dial...
Explains why there's not an issue with my pure 20M dipole that I used another analyzer to build!
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