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321. Re: [RTTY] RTTY Screwed by FCC? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sat, 14 Oct 2006 16:40:14 -0700
What hams call "CW mode" is really modulation that uses OOK (on-off keying) or ICW (interrupted continuous wave) to pass information through an HF channel. Amateur "RTTY mode" uses FSK as the modulat
/archives//html/RTTY/2006-10/msg00132.html (9,690 bytes)

322. Re: [RTTY] RTTY Screwed by FCC? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 15 Oct 2006 10:44:50 -0700
Bill, the RTTY and CW carriers are used to match the digital information to the channel (in the Shannon sense, "channel encoding"). The information is otherwise quite discrete. Claude Shannon's origi
/archives//html/RTTY/2006-10/msg00146.html (13,459 bytes)

323. Re: [RTTY] RTTY Screwed by FCC? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 15 Oct 2006 11:01:06 -0700
From the channel encoding sense, amateur "CW" is a one-bit code (on or off). It is source encoding ("bit timing") that maps these two states (not two bits, but one bit) into more states: viz, dit ele
/archives//html/RTTY/2006-10/msg00149.html (10,772 bytes)

324. Re: [RTTY] RTTY Screwed by FCC? (language lesson) (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 15 Oct 2006 11:14:02 -0700
That sir, is an example of extremely efficient source coding :-) :-) It is not one bit by the way. It is at least 5 bits since the other four fingers must be folded; and it has to usually be accompan
/archives//html/RTTY/2006-10/msg00150.html (9,575 bytes)

325. Re: [RTTY] RTTY Screwed by FCC? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 15 Oct 2006 11:36:09 -0700
A mechanic works on cars. A quantum mechanic works on very, very small cars. English is a very funny language. In colloquial terms, "quantum" actually means huge (like "quantum leap"), whereas a quan
/archives//html/RTTY/2006-10/msg00152.html (8,569 bytes)

326. Re: [RTTY] ZL8R and RTTY (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 17 Oct 2006 17:47:35 -0700
It was moderately tough for my humble station (low power, vertical antenna, Pacific Northwest). I made a QSO at about the same time Bill did -- the rest of the NA pile had thinned out considerably fr
/archives//html/RTTY/2006-10/msg00199.html (8,439 bytes)

327. Re: [RTTY] xf4dl asking for qsls direct to his hc (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 20 Oct 2006 16:16:50 -0700
When I copied the RTTY station earlier this morning, when he was asking a DL station how his 17m signal was to Germany and Middle Europe, I thought the op mentioned that his callsign is DL1YFF. Might
/archives//html/RTTY/2006-10/msg00251.html (7,554 bytes)

328. Re: [RTTY] xf4dl asking for qsls direct to his hc (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 20 Oct 2006 16:28:09 -0700
Interesting... I went through my own log and found this entry from January 2001: -- 07/01 1614 DL1YFF 21096 RTTY 100 599 599 Wants QSL for County -- 73 Chen, W7AY ____________________________________
/archives//html/RTTY/2006-10/msg00252.html (7,884 bytes)

329. Re: [RTTY] xf4dl asking for qsls direct to his hc (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sat, 21 Oct 2006 10:08:35 -0700
DL1YFF, not DL1FF. He is working JARTS right now 14081.6, at the moment half buried below KH6/N5CO. Right now he is making you send your contest exchange before he sends his. He sends a single op age
/archives//html/RTTY/2006-10/msg00264.html (7,596 bytes)

330. Re: [RTTY] W0SM (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sat, 21 Oct 2006 19:07:41 -0700
Who says there are no "cut" numbers in RTTY? :-P :-) When I worked W0SM, his CQ message used a zero in the call sign, but his confirmation to my exchange had used the letter O in W0SM. Since I'd clic
/archives//html/RTTY/2006-10/msg00268.html (6,730 bytes)

331. Re: [RTTY] [CQ-Contest] RTTY contest software (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 22 Oct 2006 11:32:48 -0700
I agree with Bill's statement. But from the viewpoint of a DX chaser and not a contester, I have found good modems to be far better on the nerves than bad modems ("did the DX really respond to me?").
/archives//html/RTTY/2006-10/msg00275.html (13,875 bytes)

332. Re: [RTTY] Thanks to 3C0M Operator (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 27 Oct 2006 12:48:19 -0700
Buy? Why not build your own? A SoftRock SDR kit goes for less than $15 (write directly to KB9YIG). I bought five kits for $70 (for phased array and diversity reception experiments one day.) Since the
/archives//html/RTTY/2006-10/msg00380.html (11,069 bytes)

333. Re: [RTTY] GU0SUP WAEDC RTTY (SOABLP) (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 13 Nov 2006 10:51:43 -0800
Yeah, FSK is pretty much that way. If you look at the bit error rate curves, a 6 dB difference in signal to noise ratio can make a signal go from pristine printing to something that is completely gar
/archives//html/RTTY/2006-11/msg00076.html (7,479 bytes)

334. Re: [RTTY] Have RTTY ops become SSB ops? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 14 Dec 2006 10:39:25 -0800
You have to think percentages, Glenn. There is always a small fraction who calls accidentally... ... and there will always be a fraction who calls out of turn as a habit, although it is debatable if
/archives//html/RTTY/2006-12/msg00070.html (10,787 bytes)

335. Re: [RTTY] RTTY RU tips (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 5 Jan 2007 11:42:53 -0800
Hasn't the exchange _always_ been RST State/Province/Number(DX) ? Just that the wallpaper was awarded by section. That is why you should include the ARRL Section in the Cabrillo log if you are W/VE a
/archives//html/RTTY/2007-01/msg00049.html (7,438 bytes)

336. Re: [RTTY] Any North Dakota stations use LOTW? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 23 Jan 2007 10:35:52 -0800
KD4POJ must like the cold weather or auroral propagation, he appears to be on the air nowadays as OX3PG :-). Another ND RTTY from yesteryear: CQ-WW-RTTY QSO: 7000 RY 2001-09-29 0741 AA6TY 599 03 OR W
/archives//html/RTTY/2007-01/msg00240.html (8,329 bytes)

337. Re: [RTTY] Intrigued (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 26 Jan 2007 17:07:13 -0800
Yes, definitely not Feld Hell, and not Olivia either unless you feed the Olivia modulator with some non-standard input (i.e., not the usual Varicode and definitely with no FEC nor any interleaving).
/archives//html/RTTY/2007-01/msg00281.html (9,729 bytes)

338. Re: [RTTY] RTTY is getting lower and lower in frequency on 20 (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 11 Feb 2007 11:42:08 -0800
If the CW signal is not much louder and don't have a lot of keyclicks, you can usually copy an RTTY signal through an adjacent CW QRM even when it touches one of the FSK tones. Unless there are two s
/archives//html/RTTY/2007-02/msg00107.html (8,429 bytes)

339. [RTTY] Attn: Don KF2XF (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 12 Feb 2007 14:57:19 -0800
Sorry to send this to the entire reflector, but KF2XF had asked me a question by email, but has my address blocked. Don, please give me an open email address that I can respond to. I hate to lose the
/archives//html/RTTY/2007-02/msg00160.html (6,619 bytes)

340. Re: [RTTY] hyphen or no hyphen (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 13 Feb 2007 12:37:31 -0800
If some software implements Baudot CR/LF as two newlines, then that bug should be fixed. The Baudot CR (carriage return - octal 10) should simply return the type carriage to the beginning of the curr
/archives//html/RTTY/2007-02/msg00202.html (8,974 bytes)

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