Re: Question about TP reception, sunrise enhancement, RF Zoo...
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pianoplayer88key
Interesting. As for the two on 747 and 774, do you think it would be worth trying them immediately after local sunrise, when KFMB-760 powers down from their 50kW directional night pattern (301.12mV/m, zip 91941 (I'm in 92020 but 91941's "center" is closer to me, and I'm within a couple houses of a 92020/91941 border)) to their 5kW non-directional day pattern (65.01mV/m, zip 91941)? Or would the TPs have already faded enough by then to make it not worth it?
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Also, what levels should local signals be below (either as indicated on dBu on a stock PL-380, or in mV/m on v-soft's zip signal site, before I attempt TP reception within a particular range of the dial? It seems that if a signal pegs the meter at 63dBu on-frequency and shows 50dBu several channels across, or is upwards of 3000mV/m on the zip signal site, it seems to block even semi-locals that would be received "loud and clear" if the pest wasn't on. But... what about if the strongest signal is only barely hitting 63dBu (with a 30dBu noise floor nearby), or isn't even cracking 50mV/m on the zip signal site? Do I still need the pests to be even weaker before I attempt ANY TP/TA reception at all? Alternatively... does an ultralight exist that has better dynamic range than the Tecsun or my Panasonic RQ-SW20? The Panasonic will clearly hear stations that are blocked on the Tecsun... so long as you're sufficiently far off in frequency. Close in, though, strong signals bleed quite far. For example, near the site of KCBQ-1170's 50kW (day), while KCBQ could be loudly heard down into the 900s or maybe 800s if I remember correctly (except for KECR-910 at the same site), KFMB-760 came in quite clear, and I think I may have even been able to get KFI-640, but they I think were completely blocked on the PL-380. Going up the dial the other way, I believe KLSD-1360 was heard fairly well on the RQ-SW20 (even though 1170's splatter continued up the dial all the way to 1710), but was blocked on the PL-380. And, even though in rural areas my PL-380 would have enough sensitivity to hear KERN-1180 Wasco-Greenacres, CA, there was no chance at all here, even though (yes, I'll admit) I tried. Also, KSDO-1130 and KPRZ-1210 was dominated by KCBQ on both radios, although an old Zenith portable from the 1960s I have with a tuned front end was able to pull in either KNX-1070 or XEPRS-1090, or maybe both, even though it too struggled with KSDO. I was also wondering about something... I've heard you mention KSUH-1450 as a major pest there, and have seen in reviews of a few radios that it could be heard all the way up to 1710 (SRF-M37V/W if I remember correctly). I've thought that KSUH, being 3 miles away from you, was quite a major pest... but is it possible that a few of my local stations - 760 (50kW, 7 miles, night), 1130 (10kW, 6 miles), and 1170 (50kW, 9 miles, day (used to be 5 miles away)) - may be even bigger pests, considering the ground conductivity here, according to the FCC map, is considerably higher than there? BTW, I briefly had a M37 (before I got the PL-380), and found that stations bled across the dial comparable to my Panasonic RQ-SW20 (this was after KCBQ moved to the diplex site farther away). One reason I was thinking that KSUH was a bigger pest was because it is heard 260kHz up the dial at your location, but even when KCBQ's transmitter was closer, they were only heard up to 1260, 90kHz up, on my Panasonic, which I thought had comparable selectivity when I compared it to the Sony. However... I've seen you refer to my location as an RF Zoo. :) So whose pests are likely stronger, mine or yours? --- In ultralightdx@..., D1028Gary@... wrote:
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