My FT-920 has some modest noise cancellation tools, I gather the fairly normal ones for modern radios. An adjustable passband DSP filter, a noise blanker and a variable noise cancelling control. I'm looking in two different directions for how to improve this, as I might TX better than I RX, at the moment.
There's noise-removal software meant to improve voice clarity, but it's meant to work on audio noise, not radio noise, much less the static noise floor of lower bands.
Not bad, not bad. I got a 7.2m fishing pole in from China today and used it to lift the far end of the EFHW so that much more of it is higher up and vaguely straight-ish. On 40m, I got picked up in Italy, which, given the orientation of the antenna, suggests I was going over the north pole to get there.
Furthest actual contact was 4000km, into North Carolina. That _should_ be in my antenna's null, but for a tail on the end bent south along the property line, so who knows?
Followup: I went out and pulled all of the slack there was in the coax, wrapped it around a tin can about eight times and duct taped it. It's a pretty terrible but traditional way to do a coax choke, and unlike the snap-on chokes this seems to have done the job. Mostly. I can crank out maximum power (just shy of 100W) and not crash anything, and the lights only flicker when dimmed.
Getting a #DXCommander soon. #EFHW are probably best suited to QRP, preferably POTA/SOTA.
Took me a while to figure out how to get this radio into the right mode to both decode ft8 messages while also accepting the audio for tx. Yaesu has (had?) some strange ideas about the right way to configure this.
Here's what got me over the hurdle: https://wsjtx.groups.io/g/main/message/1036
Also, RFI is no joke. I have a bunch to hunt down and fix, and I think the EFHW is almost certainly spewing it back inside on tx (despite so, so many chokes), and it's causing the usb devices to crash...
But also if the weather allows it, I should try to get this antenna up a bit higher. Really, I can probably get up on the roof and hurl the antenna itself with a weight on it over the top of the tree and get a much better result than I have now.
Ultimately, I think I'll get a dxcommander and put it up in the middle of the back yard. But good to know for POTA/SOTA next spring, the EFHW works nearly perfectly on 40/20 and maybe 15, sans tuner.
Got a Yaesu FT-920 delivered today, along with a quite nicely-priced 35A power supply. In a rush, I trimmed the tallest tree in the yard a bunch to make it possible to throw a line over a tall-ish branch. Finally got that line up, just before sunset, and in the dark with headlamps dragged up the middle of a 40m EFHW. Miraculously spot-on for 20m and very bottom of 40m, maybe 15m.
And then the ionosphere just kinda... went away.
Time to sleep and try again tomorrow.
I checked into a 70cm net, and my ancient analog computer speakers love to pick up 70cm. I added snap-on chokes which cut it down probably 4-5dB, though it's still noticeable. Tomorrow I'll try swapping the cables that run from the sound card to the subwoofer/amp combo for longer stereo patch cables, loop each through a ferrite several times, one at each end, see how that goes.
It's not critical; I can turn them off when transmitting. Just an opportunity for experimentation.
AI7PR