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261. Re: [RTTY] WPX - of macro and other style matters (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 15 Feb 2005 09:51:58 -0800
On Feb 15, 2005, at 9:23 AM, Mark Perrin wrote: I was surprized when I was running at getting responses of "N7MQ N7MQ de XXXX " - the running station knows his call, but if do that, just using the ru
/archives//html/RTTY/2005-02/msg00253.html (7,499 bytes)

262. Re: [RTTY] RE: The latest craze (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 15 Feb 2005 10:36:04 -0800
On Feb 15, 2005, at 10:21 AM, Phil Cooper wrote: Not only a series of dots, but I also had the following: MMMMMM GU0SUP DE AB1CD - a series of the letter M. Phil, see previous thread about LTRS and F
/archives//html/RTTY/2005-02/msg00256.html (6,722 bytes)

263. Re: [RTTY] Updated AA5AU RTTY Contest Notes - XE and WPX contests (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 16 Feb 2005 08:35:09 -0800
On Feb 16, 2005, at 6:28 AM, 7L4IOU wrote: I discussed with Hal JF1PJK and Terry JA7IC about 756PRO Twin Peak Filter. By the way, I wasn't sure if Don got his "turn the RF gain down" hint from Hisami
/archives//html/RTTY/2005-02/msg00285.html (10,447 bytes)

264. Re: [RTTY] The MMMM's !! (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 16 Feb 2005 17:08:11 -0800
I think Jerry means TOOAQWEAQWE exchanges? Well.... those who insists upon sending 599-001 (it does look prettier -) could at least send 599-<FIGS>001. It is relatively easy for a contest program to
/archives//html/RTTY/2005-02/msg00300.html (8,249 bytes)

265. Re: [RTTY] The MMMM's !! (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 16 Feb 2005 18:34:50 -0800
Some contest programs recognize a callsign by looking for DE<space><string>. If you want it to be less work for the other guy, send "DE S1GN" when responding to a CQ. Send "S1GN S1GN" if you want him
/archives//html/RTTY/2005-02/msg00309.html (8,712 bytes)

266. Re: [RTTY] OOK Recieve Mode? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 17 Feb 2005 08:12:30 -0800
OOK On-Off Keyed (one carrier, keyed on and off, e.g., CW) FSK Frequency Shift Keyed (keying between two different carrier frequencies, e.g., RTTY) PSK Phase Shift Keyed (keying the phase of a carrie
/archives//html/RTTY/2005-02/msg00322.html (7,938 bytes)

267. Re: [RTTY] OOK Recieve Mode? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 17 Feb 2005 08:18:17 -0800
Whoops, sorry. I replied before seeing Jerry's reply. Sorry for the dupe. The answer to OOK is: "What Jerry said." :-) By the way, OOK is pretty much the standard terminology that communications text
/archives//html/RTTY/2005-02/msg00323.html (6,986 bytes)

268. Re: [RTTY] FSK and ft-1000mp (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 10 Mar 2005 14:54:37 -0800
You probably want "Offset" and not "Carrier," IMHO "Carrier" would display the suppressed carrier frequency of the SSB receiver onto your VFO dial, which is pretty meaningless for figuring out where
/archives//html/RTTY/2005-03/msg00069.html (8,834 bytes)

269. Re: [RTTY] FSK and ft-1000mp (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 11 Mar 2005 08:44:29 -0800
What we know as BPSK31 and BPSK63 (the double rate BPSK31) are really encoded as a differential phase shift. I.e., it is changes in phase (by 180 degrees) that encodes a bit and not the absolute phas
/archives//html/RTTY/2005-03/msg00077.html (9,668 bytes)

270. Re: [RTTY] 24 bit sound card (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 18 Mar 2005 09:54:40 -0800
I'll bet that you will find that there are various opinions on this. Here are my 2 cents. Warning, this is long. If you don't want to read through all of it, the gist is that IMHO, it depends on whet
/archives//html/RTTY/2005-03/msg00128.html (13,106 bytes)

271. Re: [RTTY] 24 bit sound card (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 18 Mar 2005 12:11:53 -0800
I will try to find time to record the audio amplitude variations across the band in some future contest and also study how many bits an RTTY signal (plus noise) needs to be above the LSB of an A/D co
/archives//html/RTTY/2005-03/msg00130.html (9,041 bytes)

272. Re: [RTTY] ARRL Bandwidth Proposal (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 14 Apr 2005 10:47:38 -0700
With AFSK, you can experiment with different transmit bandwidth rather nicely. I have found that a moderate brick wall output filter with about 350 Hz bandwidth to not interfere with the performance
/archives//html/RTTY/2005-04/msg00118.html (9,709 bytes)

273. Re: [RTTY] re VE3NEA rtty-modems tests - is MMTTY obsolete? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Fri, 15 Apr 2005 09:40:30 -0700
I am definitely indebted to Alex VE3NEA for sharing the RttyCompare project. I liked it so much that I ended up creating a special tool in my modem for which to adjust parameters (ATC, matched filter
/archives//html/RTTY/2005-04/msg00123.html (10,177 bytes)

274. Re: [RTTY] Need MMTTY.txt log for 29-March 40m RTTY (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Tue, 14 Jun 2005 15:09:36 -0700
Ah, the missing log entry... I pounced on the station. Good copy, and the op was a regular contest op who knew my call sign. He even told me that I was the first RTTY contact for that expedition. Aft
/archives//html/RTTY/2005-06/msg00145.html (7,781 bytes)

275. Re: [RTTY] KJ4QF North American QSO Party, RTTY (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 17 Jul 2005 14:28:38 -0700
On the surface, communications systems obey this thing call the Reciprocity Theorem. What it says is that if each of you is transmitting the same power, then no matter what antenna you are using (du
/archives//html/RTTY/2005-07/msg00162.html (9,852 bytes)

276. Re: [RTTY] RTTY WAS (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Mon, 1 Aug 2005 09:49:40 -0700
At some level, all digital modes used over the airwaves are analog, unless you send baseband Walsh functions or Manchester codes over the air -- and if you do that, each bit of information will be sp
/archives//html/RTTY/2005-08/msg00005.html (7,749 bytes)

277. Re: [RTTY] RTTY gear (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Wed, 3 Aug 2005 21:10:09 -0700
There is an error with the http://www.ab5k.net/So2rRtty.aspx URL at the line <img id="Image1" src="file:///C:\Inetpub\wwwroot\Images\So2rFilters \AB5K_SO2R.jpg" alt="" border="0" /> which directs you
/archives//html/RTTY/2005-08/msg00025.html (6,980 bytes)

278. Re: [RTTY] SCC RTTY (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Thu, 25 Aug 2005 11:40:27 -0700
Perhaps it would be clearer if it'd stated "the year the operator was first issued an amateur radio license." At least that was how I interpreted it the last time I participated. 73 Chen, W7AY ______
/archives//html/RTTY/2005-08/msg00185.html (6,625 bytes)

279. Re: [RTTY] Did ur QSO w/K7C on 17m RTTY today show up on DXA? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 2 Oct 2005 20:24:30 -0700
I checked a few of the QSOs that I saw K7C confirm on the air today (K4XG, JH3HBO, UA0FDX, JL1OEC, etc) and didn't see any one credited for 17 RTTY. They'd appeared yesterday (my log shows Oct 2, 011
/archives//html/RTTY/2005-10/msg00027.html (8,766 bytes)

280. Re: [RTTY] Did ur QSO w/K7C on 17m RTTY today show up on DXA? (score: 1)
Author: Kok Chen <chen@mac.com>
Date: Sun, 2 Oct 2005 20:34:25 -0700
Ditto my 40 SSB contact. The green square stayed on for a couple of days and then vanished into the black hole of Kure. I won't sweat what DXA says, folks. The reason I know for sure I made the 40 SS
/archives//html/RTTY/2005-10/msg00030.html (8,873 bytes)

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