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241. Re: LF: Re: Re: 500/137 XBAND QSO (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Mon, 15 Dec 2008 23:00:06 +0100
John, The radiation resistance of this antenna must be about 5 Ohm, with a loss resistance of 20 Ohm the efficiency is 25%. So I guess a TX power no greater than 4W would be sufficient to meet the 1W
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00296.html (11,514 bytes)

242. Re: LF: RE: Re: whisper (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Tue, 16 Dec 2008 21:13:41 +0100
can't Tx linear modes yet Hello Gary, if I got it right WSPR is a 4-FSK mode and does not require linear amplification. 73, Rik ON7YD - OR7T Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.h
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00532.html (10,024 bytes)

243. Re: LF: RE: Re: whisper (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Wed, 17 Dec 2008 08:49:03 +0100
Hello Johan, interesting. Are the specifications of WSPR (coding scheme, shifts etc ..) somewhere available ? 73, Rik ON7YD - OR7T Correct, and, according to Joe K1JT, a "FSK tone accuracy" of 0.1Hz
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00564.html (11,209 bytes)

244. Re: LF: Re: Re: 500/137 XBAND QSO (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Mon, 15 Dec 2008 21:40:48 +0100
1/4 wave inv L at over 100 ft high. Hello Mal, a great antenna, congrats again. I (and maybe some others) can only dream of such an antenna. The radiation resistance of this antenna must be about 5 O
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00587.html (10,872 bytes)

245. Re: LF: Re: Re: 500/137 XBAND QSO (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Mon, 15 Dec 2008 17:44:04 +0100
Hello Mal, last night I could copy your QRSS signal (or should I say lazy man's CW) 599+. Congrats on the nice signal, your were beating SM6BZH (who was claiming 3 W ERP) by about 10dB. 73, Rik ON7YD
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00599.html (12,260 bytes)

246. Re: LF: 500KHz QSB (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Sun, 28 Dec 2008 16:26:47 +0100
Gary, if the QSB comes from multiple path propagation (where one of both of the paths is changing) QSB can be different on different frequencies. One could even use the QSB/frequency pattern to deter
/rsgb_lf_group-archives/html/rsgb_lf_group/2008-12/msg00722.html (10,350 bytes)

247. Re: LF: WE2XGR/2 in WSPR mode (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Sat, 31 Jan 2009 22:56:00 +0100
Jay, first traces at 2132Z, first decode at 2144Z. Seems it took your signal about 20 minutes to travel 1000km more south What power - antenna - ERP are you running ? 73, Rik ON7YD - OR7T Quoting jru
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00003.html (12,618 bytes)

248. LF: USA wispering ? (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Fri, 30 Jan 2009 22:31:57 +0100
Any USA wispering tonight ? 73, Rik ON7YD - OR7T Disclaimer: http://www.kuleuven.be/cwis/email_disclaimer.htm
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00072.html (10,422 bytes)

249. Re: LF: QRP WSPR beacon (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Sat, 31 Jan 2009 15:47:47 +0100
Andy, no copy here at the moment (14:45 UT). I will leave the RX monitoring for the next hours while working in the garden. Look at wsprnet for eventual spots from me. 73, Rik ON7YD - OR7T Its operat
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00119.html (9,728 bytes)

250. Re: LF: Razor blade RX (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Tue, 06 Jan 2009 22:53:36 +0100
Mal, I did build a "crystal radio" with a razor blade as detector when I was 14 years old. It had to be rusty to work properly and even then it was a very poor detector. And it is an AM detector, so
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00136.html (10,473 bytes)

251. LF: WSPR & WSJT7 (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Fri, 30 Jan 2009 11:10:24 +0100
Dear all, last night I tried receiving WSPR using WSJT7. It works fine, but I cannot find any "upload button". Does WSJT7 (in WSPR mode) have an upload function ? 73, Rik ON7YD - OR7T Disclaimer: htt
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00194.html (10,363 bytes)

252. Re: LF: Receiving YO2X on 505.8kHz (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Sun, 04 Jan 2009 21:23:47 +0100
KN05PS That's the same locator as YO2IS, maybe Sigi knows more? 73, Rik ON7YD -OR7T Hello LF! Receiving YO2X on 505.8kHz here for the first time 1740UTC. Transmission is CW/QRSS with the CW audible R
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00337.html (9,224 bytes)

253. Re: LF: Razor blade RX .... Try a Cohere? (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Wed, 07 Jan 2009 22:13:00 +0100
Mal, I have done it when I was 14 years old, it is not that difficult and is described in books and on the web. What is the point that I (or others) have to prove to you that we know ? Or do I have t
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00374.html (14,773 bytes)

254. Re: LF: WSPRNet (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Fri, 30 Jan 2009 21:23:05 +0100
Dear wisperers, it's getting crowdy at the top of the band: 5 stations recorded. I am running WSJT7 and WSPR together and it works fine except for one odd event: WSPR missed the entire 20:08 slot (al
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00409.html (10,130 bytes)

255. Re: LF: Razor blade RX .... Try a Cohere? (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Wed, 07 Jan 2009 09:11:17 +0100
MCW: what a waste of bandwidth, Mal will allert OFCOM ! 73, Rik ON7YD - OR7T At 00:42 7/01/2009, you wrote: No problem! Use MCW! Has been typical for 500 kHz. 73 DJ1ZB "M0FMT" <[email protected]> sch
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00473.html (12,329 bytes)

256. Re: LF: Re: Re: Band plan (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Mon, 26 Jan 2009 09:02:29 +0100
What is the difference (for others) between beaconing and a shear endless QRSS CQ-call or QSO. If that signal is S9+ and near the band centre it blocks in both cases a good part of the band for weak
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00556.html (13,452 bytes)

257. Re: LF: Re: RE: Re: RE: QRS 240 (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Sun, 04 Jan 2009 20:53:45 +0100
Hello all, I guess it all comes down to "live and let live". While any kind of experimentation should be encouraged, one should also think about the impact it could have on other band users. But the
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00594.html (20,235 bytes)

258. Re: LF: WSPR QRP 500 mW to Ae .. geting silly !!! (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Fri, 30 Jan 2009 22:40:10 +0100
Graham, still 100% copy. Even when competing with Jim, who is 30dB stronger and only 50Hz up it works fine. Btw, Jim is pushing the "noise level" reported by WSJT7 about 12dB up. 73, Rik ON7YD - OR7T
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00637.html (14,865 bytes)

259. Re: LF: WSPR Distance (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Fri, 30 Jan 2009 22:58:33 +0100
Lee, with me the database at wsprnet shows km in the header 73, Rik ON7YD - OR7T Hi LF Group, Just been looking at the Database of tonights activity, and I'm reported at 700miles from GM4SLV Yet G4WG
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00674.html (9,780 bytes)

260. Re: LF: PROPAGATION WSPR (score: 1)
Author: Rik Strobbe <[email protected]>
Date: Tue, 27 Jan 2009 22:07:08 +0100
Hello Klaus, On the other hand, WSPR has the advantage of automatic recording. But that is not an advantage of the mode, it simply is the lack of a corresponding simple program that does the same wit
/rsgb_lf_group-archives/html/rsgb_lf_group/2009-01/msg00707.html (11,422 bytes)


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