[Lowfer] W7IUV in EN90xn
Ward K7PO
wmwheaton at aim.com
Wed Mar 7 14:23:34 EST 2018
Guys,
Here's my $.02 worth. When Ron and I tried the head to head tests, we saw variations that didn't make a lot
of sense some days. Even running the same power (identical amps built by the same guy, HI), we saw 6-10 db
differences. Ron and I are ~50 miles apart, much closer than Larry and I. The only trend I noticed with our
testing was that Ron was consistently stronger in the 1500 to 2000 km range (AZ to IUV for example), but I
was usually stronger on the 3000+ km paths, (for example KL7L). Running the same power, there were many times
I'd be decoded in VK (630m) and Ron would not. Our conclusion at the time was a difference in take off angle.
If true, and taking into account our geographical difference, and my gut feeling about WSPR's non linear reports
especially in the lower signal levels, I don't see where we can make any real correlation between stations, except
in very broad terms. As for my power level, I show 5W(because that's what the U3S lets me report), but I believe
it's closer to 4W ERP. I don't know if Larry is using ERP or EIRP for his reporting.
Another interesting thing in the numbers is Larry shows a 2 db spread between 0902Z and 0942Z. During roughly
the same time period, 0904Z to 0944Z, XXP shows an 11 db spread in reports. What's going on there? It would
appear that Larry's path was much more stable than XXP's during that small window. Going back just a few minutes
for XXP, the spread is even greater, with a -11 spot at 0856Z.
Ward K7PO/WH2XXP
-----Original Message-----
From: Michael Sapp <wa3tts at verizon.net>
To: Larry Molitor <w7iuv at yahoo.com>; Discussion of the Lowfer (US, European, & UK) and MedFer bands <lowfer at mailman.qth.net>
Sent: Wed, Mar 7, 2018 10:07 am
Subject: Re: [Lowfer] W7IUV in EN90xn
> Interesting comparisons. I don't know about Ward's power estimate but I'm
> pretty sure mine is very optimistic. Given that, I can't explain the
> observed S/N difference.
Larry. Well, the data set is limited so we are at the initial observation
stage. I did manage to snap a screen capture before hitting the sack for the
2nd time overnight. The
decodes were farther into early morning pre-dawn hours---more like the first
attempt on Sunday into Monday...
8 spots:
Timestamp Call MHz SNR Drift Grid Pwr Reporter RGrid km az
2018-03-07 09:06 W7IUV 0.137452 -25 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:02 W7IUV 0.137452 -26 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:18 W7IUV 0.137452 -25 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:14 W7IUV 0.137452 -25 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:22 W7IUV 0.137451 -27 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:26 W7IUV 0.137452 -27 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:30 W7IUV 0.137452 -26 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
2018-03-07 09:42 W7IUV 0.137452 -26 0 DN07dg 0.2 WA3TTS/2
EN90xn 3227 89
Somewhat fewer spots but the trend of multiple W7IUV captures over the
3200km path seems to be continuing....
https://www.dropbox.com/s/xkatfsghwlklp7d/IMG_1119.JPG?dl=0
WH2XXP signals peaked in the audio range (-11 at 0856 best of overnight
session) just before the first W7IUV decode....
2018-03-07 09:56 WH2XXP 0.137507 -19 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:52 WH2XXP 0.137507 -24 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:48 WH2XXP 0.137507 -20 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:44 WH2XXP 0.137507 -24 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:40 WH2XXP 0.137506 -25 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:36 WH2XXP 0.137507 -24 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:32 WH2XXP 0.137507 -20 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:28 WH2XXP 0.137507 -22 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:24 WH2XXP 0.137507 -18 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:20 WH2XXP 0.137507 -17 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:16 WH2XXP 0.137507 -18 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:12 WH2XXP 0.137507 -23 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:08 WH2XXP 0.137506 -17 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:04 WH2XXP 0.137507 -14 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 09:00 WH2XXP 0.137507 -13 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 08:56 WH2XXP 0.137507 -11 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 08:52 WH2XXP 0.137507 -12 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 08:48 WH2XXP 0.137507 -13 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 08:44 WH2XXP 0.137506 -13 0 DM33 5 WA3TTS/2
EN90xn 3014 65
2018-03-07 08:40 WH2XXP 0.137506 -15 0 DM33 5 WA3TTS/2
EN90xn 3014 65
Captures made with the benchtop and modular ZFY-1 based DBM converter.
73 Mike wa3tts
----- Original Message -----
From: "Larry Molitor via Lowfer" <lowfer at mailman.qth.net>
To: "Discussion of the Lowfer (US, European,& UK) and MedFer bands"
<lowfer at mailman.qth.net>
Sent: Wednesday, March 07, 2018 10:19 AM
Subject: Re: [Lowfer] W7IUV in EN90xn
> Interesting comparisons. I don't know about Ward's power estimate but I'm
> pretty sure mine is very optimistic. Given that, I can't explain the
> observed S/N difference.
>
>
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