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Total 27 documents matching your query.

1. Topband: Skimmer calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 18 Aug 2014 07:53:23 -0400; I am not a Skimmer expert, and am just asking. Question: Are all the Skimmers individually(and collectively) calibrated in concert? Can one rely on them for comparing scientific data and conclusion t; /archives//html/Topband/2014-08/msg00172.html (12,698 bytes)
2. Re: Topband: Skimmer calibration (score: 1): Author: Tim Shoppa <tshoppa@gmail.com>; Date: Mon, 18 Aug 2014 11:11:33 -0400; There's a lot of scatter in the dB measurements from skimmers. If I see dozens of spots graphed on the reversebeacon "spots comparison tool" then I can believe systemic differences like 3-5dB. But I; /archives//html/Topband/2014-08/msg00173.html (13,456 bytes)
3. Re: Topband: Skimmer calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 18 Aug 2014 12:16:02 -0400; This is why some time and multiple skimmers must be involved in the statistics................otherwise data doesn't mean much. Without skimmer I never settled on antennas until many dozens of blind; /archives//html/Topband/2014-08/msg00176.html (14,754 bytes)
4. Re: Topband: Skimmer calibration (score: 1): Author: Pete Smith N4ZR <n4zr@contesting.com>; Date: Mon, 18 Aug 2014 12:22:56 -0400; It's also worth mentioning that you can evade the Skimmer's "wait 10 minutes before re-spotting" limitation simply by QSYing 500 Hz or sobefore re-sending - that way you can get a lot of data points; /archives//html/Topband/2014-08/msg00177.html (15,821 bytes)
5. Re: Topband: Skimmer calibration (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Mon, 18 Aug 2014 09:47:58 -0700; Yes. BUT -- my experience has been that I must average hundreds of data points to get meaningful data. The reasons are simple -- we must contend with QSB, and as Tom noted in another post, nulls in t; /archives//html/Topband/2014-08/msg00178.html (11,280 bytes)
6. Re: Topband: Skimmer calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Mon, 18 Aug 2014 14:25:37 -0400; Since no one likely knows the gain of a reference antenna within a dB or so, splitting hairs doesn't matter. Ten dB would jump right out, while 3 dB might get lost in the QSB. When I was comparing hi; /archives//html/Topband/2014-08/msg00179.html (12,675 bytes)
7. Re: Topband: Skimmer calibration (score: 1): Author: Eddy Swynar <deswynar@xplornet.ca>; Date: Mon, 18 Aug 2014 14:32:43 -0400; Hi Guys, Thank goodness the QRP-types amongst us all don't seem to be so fixated & obsessed with such intricate & minute details... If they were, most would probably never even get on the air with th; /archives//html/Topband/2014-08/msg00180.html (10,070 bytes)
8. Re: Topband: Skimmer calibration (score: 1): Author: Guy Olinger K2AV <k2av.guy@gmail.com>; Date: Mon, 18 Aug 2014 21:08:30 -0400; We were talking about validating or debunking people's RX experience at the shore in various relationships to the edge of salt water. And the anecdota included just about any signal around, on whatev; /archives//html/Topband/2014-08/msg00183.html (12,427 bytes)
9. Re: Topband: Skimmer calibration (score: 1): Author: "Juan EA5RS" <ea5rs@ono.com>; Date: Tue, 19 Aug 2014 11:10:15 +0200; To have an idea of what kind of spread of SNRs one can expect from skimmer reports, I performed a test this morning I recorded two overlapping CQ messages with two different callsigns, one had the si; /archives//html/Topband/2014-08/msg00184.html (14,513 bytes)
10. Re: Topband: Skimmer calibration (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 19 Aug 2014 04:33:33 -0500; When I last investigated, all the skimmers and Web SDRs that were outside of North America all had terrible receive antennas for copying DX signals on 160. (And who knows how many of them are in quie; /archives//html/Topband/2014-08/msg00185.html (10,202 bytes)
11. Re: Topband: Skimmer calibration (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Tue, 19 Aug 2014 11:52:34 +0200; Sure it is. Most skimmers are setup to receive all directions on more then one band. Anyway, Skimmers only show S/N. 73 Peter When I last investigated, all the skimmers and Web SDRs that were outside; /archives//html/Topband/2014-08/msg00186.html (10,570 bytes)
12. Re: Topband: Skimmer calibration (score: 1): Author: Dan Edward Dba East edwards <dan.n.edwards@sbcglobal.net>; Date: Tue, 19 Aug 2014 07:55:01 -0700; the gw8izr skimmer seems pretty good to me...dr1a also...both, better than average, IMHO 蟵 belgian one also ( can't remember the call..) couple in JA also.. 73, w5xz, dan When I last investigated, a; /archives//html/Topband/2014-08/msg00189.html (11,182 bytes)
13. Re: Topband: Skimmer calibration (score: 1): Author: Tim Shoppa <tshoppa@gmail.com>; Date: Tue, 19 Aug 2014 12:06:49 -0400; I quickly noticed that some skimmers seem to have more effective antenna systems than others. More than S/N, I look at kinda the breadth and depth of where I'm spotted. On 160M, GW8IZR and DL1A are w; /archives//html/Topband/2014-08/msg00191.html (11,091 bytes)
14. Re: Topband: Skimmer calibration (score: 1): Author: Guy Olinger K2AV <k2av.guy@gmail.com>; Date: Tue, 19 Aug 2014 17:01:23 -0400; Do we really care that skimmers aren't hooked up to antennas with pattern and gain? One of the things in using VOACAP is knowing the pattern of the RX antenna as well as TX. Omni pattern at RX remove; /archives//html/Topband/2014-08/msg00205.html (12,226 bytes)
15. Re: Topband: Skimmer calibration (score: 1): Author: Yuri Blanarovich <k3bu@optimum.net>; Date: Tue, 19 Aug 2014 18:08:53 -0400 (EDT); Depends what are you expecting from Skimmer-RX-ANT setup. If you want skimmer to find DX before the pack and looking for low angle signals, then setup better use antenna with proper low angle vertica; /archives//html/Topband/2014-08/msg00207.html (15,528 bytes)
16. Re: Topband: Skimmer calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 19 Aug 2014 19:57:47 -0400; Do we really care that skimmers aren't hooked up to antennas with pattern and gain? One of the things in using VOACAP is knowing the pattern of the RX antenna as well as TX. Omni pattern at RX remove; /archives//html/Topband/2014-08/msg00208.html (11,381 bytes)
17. Re: Topband: Skimmer calibration (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Tue, 19 Aug 2014 21:23:46 -0400; Do we really care that skimmers aren't hooked up to antennas with pattern and gain? One of the things in using VOACAP is knowing the pattern of the RX antenna as well as TX. Omni pattern at RX remove; /archives//html/Topband/2014-08/msg00211.html (11,650 bytes)
18. Re: Topband: Skimmer calibration (score: 1): Author: "Tom W8JI" <w8ji@w8ji.com>; Date: Tue, 19 Aug 2014 22:08:37 -0400; BC antennas have the elaborate radial system in order to get that groundwave while the typical on ground ham vertical loses a lot of the 0-10 degree (or more) radiation. Go to the beach to get it bac; /archives//html/Topband/2014-08/msg00212.html (10,830 bytes)
19. Topband: Skimmer calibration (score: 1): Author: "Tracey Gardner" <tracey.gardner@talktalk.net>; Date: Wed, 20 Aug 2014 07:30:49 +0100; Hello Mike You forget that on this side of the pond, the majority of us live on pocket handkerchief sized plots. :-) The representative of a major building company in the UK was on TV yesterday sayin; /archives//html/Topband/2014-08/msg00213.html (8,174 bytes)
20. Re: Topband: Skimmer calibration (score: 1): Author: donovanf@starpower.net; Date: Wed, 20 Aug 2014 03:47:35 -0400 (EDT); Iceland: three people per square km Hello Mike You forget that on this side of the pond, the majority of us live on pocket handkerchief sized plots. :-) The representative of a major building company; /archives//html/Topband/2014-08/msg00214.html (9,202 bytes)

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