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341. Re: [RTTY] hyphen or no hyphen (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 13 Feb 2007 21:19:51 -0800
(<Blush> Thanks for the kind words, Don.) The sequence above that you saw can be explained this way... If the sender is using USOS, s/he assumes that you are too. So, to send the above exchange, he s
/archives//html/RTTY/2007-02/msg00231.html (12,498 bytes)

342. Re: [RTTY] extfsk & omni6 (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 28 Feb 2007 16:03:14 -0800
The Omni 5 and 6 that I owned both had a single crystal for the LO, but they switched in a trimmer capacitor to move the frequency 170 Hz lower when Space is keyed. Did you reverse the battery polari
/archives//html/RTTY/2007-02/msg00469.html (8,827 bytes)

343. Re: [RTTY] Mark or Space only? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 9 Mar 2007 16:45:07 -0800
Yes, there is at least one software modem that explicitly implements Mark-only and Space-only decoding. Even when the modem does not implement it explicitly, you can still get a mark-only (or space-o
/archives//html/RTTY/2007-03/msg00056.html (8,296 bytes)

344. [RTTY] N8S at 10145.33 (now: 0624 UTC) (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 10 Apr 2007 23:27:05 -0700
UP 2. I see EU getting through. Very loud into Oregon. 73 Chen W7AY _______________________________________________ RTTY mailing list RTTY@contesting.com http://lists.contesting.com/mailman/listinfo/
/archives//html/RTTY/2007-04/msg00059.html (7,277 bytes)

345. Re: [RTTY] N8S changing software (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 11 Apr 2007 07:56:56 -0700
There was a change of op at about that time. The op earlier was SV2BFN and at about 2 am local time here, he announced they were going off the air for a short while to change op and refill the genera
/archives//html/RTTY/2007-04/msg00068.html (8,173 bytes)

346. Re: [RTTY] N8S (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 11 Apr 2007 10:31:15 -0700
Well, at one point on 30m RTTY last night, this is what he typed out: IK1MNY YOU ARE IN BLACK LIST...I CALL SV AND YOU TRANSMIT OVER HIM PSE QRX QRX DE N8S It was such a classic, I saved it. He had s
/archives//html/RTTY/2007-04/msg00083.html (8,833 bytes)

347. Re: [RTTY] Blacklisting over zealous callers (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 11 Apr 2007 13:54:34 -0700
Longer exchanges?! You are going to make Bill W6WRT hopping mad again :-) The solution is very simple: look at what the DX is sending and fashion your calls to be shorter. Shannon-Nyquist Sampling Th
/archives//html/RTTY/2007-04/msg00101.html (8,423 bytes)

348. Re: [RTTY] Blacklisting over zealous callers (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 11 Apr 2007 14:37:54 -0700
No, because the message itself is not the period. The message plus the dead time (when he is listening) is the period. :-P (Similar to the case where the fundamental frequency of a bit pulse train is
/archives//html/RTTY/2007-04/msg00110.html (8,988 bytes)

349. Re: [RTTY] Blacklisting over zealous callers (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 11 Apr 2007 14:48:17 -0700
But I bet the same guys are too thick skinned to care. Perhaps better to put "LID" in the mode box <grin>. 73 Chen, W7AY _______________________________________________ RTTY mailing list RTTY@contest
/archives//html/RTTY/2007-04/msg00112.html (8,739 bytes)

350. [RTTY] N8S exchanges (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 12 Apr 2007 13:54:09 -0700
Speaking of funny exchanges, one of the N8S RTTY ops sent "I AM NOT DOUG" the other evening. He probably got called "Doug" too many times :-). I'd sent "TU GARRY" to K7K and it turned out not to be N
/archives//html/RTTY/2007-04/msg00155.html (7,629 bytes)

351. Re: [RTTY] Re the blacklisting (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 12 Apr 2007 14:00:16 -0700
I have seen "I don't care who you are or where you are" a few times from N8S, so it is probably a standard macro on one of their computers :-). 73 Chen, W7AY _________________________________________
/archives//html/RTTY/2007-04/msg00156.html (7,658 bytes)

352. Re: [RTTY] Product Review: Computer Sound Cards for Amateur Radio (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 24 Apr 2007 14:47:28 -0700
For my own simple investigations (your mileage will, I am sure vary), here are my two cents... If there is only a single RTTY signal present and there is no multipath present, and the rig has good AG
/archives//html/RTTY/2007-04/msg00242.html (11,116 bytes)

353. Re: [RTTY] Product Review: Computer Sound Cards for Amateur Radio (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 24 Apr 2007 15:02:26 -0700
Whoops, I meant I need *not* worry about the number of bits in software being the limiting factor. 73 Chen, W7AY _______________________________________________ RTTY mailing list RTTY@contesting.com
/archives//html/RTTY/2007-04/msg00243.html (7,751 bytes)

354. Re: [RTTY] New radio from Elecraft, the K3,looks REALLY good for RTTY (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 29 Apr 2007 18:52:26 -0700
Or do as their web page says, just use a SoftRock (change the crystal on it) and feed it into your favorite software to display the waterfall or spectrum on your computer display. Cost about $15 for
/archives//html/RTTY/2007-04/msg00273.html (9,012 bytes)

355. [RTTY] VP6TD (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 3 Jun 2007 23:25:51 -0700
VP6TD (ZL2HGR, visiting Pitcairn until September) was on 20m PSK31 this evening casually (5 to 10 minutes per QSO) working stations. I worked him between 0533 and 0540 UTC, 14072.4 kc carrier. When I
/archives//html/RTTY/2007-06/msg00016.html (6,484 bytes)

356. Re: [RTTY] what mode is this? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 30 Jul 2007 11:01:48 -0700
Birds? OK, perhaps one of the MFSK modes might sound like a flock of migrating geese we hear in Oregon :-) Bill had mentioned about 600 Hz wide, which means that it is neither MFSK16 nor the common D
/archives//html/RTTY/2007-07/msg00193.html (7,596 bytes)

357. Re: [RTTY] what mode is this? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 30 Jul 2007 12:05:06 -0700
From KE1JF's wav file, it is Multi-toned FSK of some sort, close to 400 Hz wide I took a look at the bins in cocoaModem's MFSK16 tuning indicator and see this: The separation of the tones is wider th
/archives//html/RTTY/2007-07/msg00198.html (7,328 bytes)

358. Re: [RTTY] I made a typo (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 30 Jul 2007 12:18:20 -0700
Sorry, the TIFF files from my previous posting got stripped away... Anyway, when I resampled the sound file properly, I am now seeing a bandwidth of about 550 Hz. The separation between the tones app
/archives//html/RTTY/2007-07/msg00199.html (6,820 bytes)

359. Re: [RTTY] what mode is this? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 30 Jul 2007 12:39:58 -0700
OK, I resampled that Alfred Hitchcock (Birds, get it? :-) sound clip from Bill (actually from Tom) by a factor of two, and it has the same structure as MFSK16. I.e., when resampled by 2, it has the s
/archives//html/RTTY/2007-07/msg00200.html (7,831 bytes)

360. Re: [RTTY] The uknown signal (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 30 Jul 2007 13:59:48 -0700
This one is definitely 16 tones, so you can count out the 4-, 8- variants, and also count out the 16-1000 since it is definitely not that wide. Someone with Olivia capability might try the sound file
/archives//html/RTTY/2007-07/msg00207.html (7,215 bytes)

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