I had the waterfall rather squished. A little better now? ;)
Quick look at the mediumwave band. External inline attenuator is set to no attenuation.
Alternatively using SDRSharp under Wine.
Skimmed longwave BCB. Just Medi 1 right now, but that is not bad IMO considering current regional thunderstorms.
https://www.hfunderground.com/board/index.php/topic,107149.0.htmlSome NDBs between longwave BCB and mediumwave BCB.
A few of the more powerful signals moving further down the spectrum....
60KHz - WWV - S6 - 40dB SNR
40.75KHz - NAU Puerto Rico - S6 - 30dB SNR
25.2KHz - NML North Dakota - S4 - 24dB SNR
24KHz - NAA Maine - S5+ - 25dB SNR
8KHz - ?? - S5 - 32dB SBR
Low frequency seems to be working okay. :)
Both of my decent PA0NHC active miniwhips work! Glad I kept them to check out. The prob was damaged bias tees.
I intend to put them right back on their existing masts along with new feedlines.
Replaced the temporary active miniwhip with a temporary active loop. Copper wire inside a hulahoop feeding a MLA-30 preamp modified with a F connector, all wire tied to a PVC pipe stuck into a tripod. I pointed it vaugely NNW/SSE to favor NA for now. I am not sure SNR is improved much, but gain is improved on at least a couple of bands where the miniwhip was quite low.
The 31' vertical with the new unun is working okay for upper-HF as well. Listening to the European 11m SSB traffic right now.
Been raining otherwise I might have considered fixing the small on-ground radial field on my 18' end-fed vertical this morning. Maybe later or tomorrow if it dries up.... or the ground freezes, which is a possibility this weekend in Florida. o.0
Lowered voltage at the bias tee I was using to feed the MLA-30 preamp down to 4.5v last night. Add some voltage drop due to 75' of RG-6 feedline. Gain barely dropped at lower-HF bands and MW, while SNR likely improved. I still need to check voltage versus gain on upper-HF bands.
Positive supply voltage for the TL592B differential amp is listed at 3v to 8v. That tracks with my results. Gain at 3v (minus line loss) dropped considerably. The preamp at 1.5v dropped out.
12vDC as supplied by the stock USB->12vDC boost regulator in the bundled bias tee is likely overdriving the amp IC and potentially affecting SNR. YMMV, of course.