- 1. [RTTY] Narrow RTTY (score: 1)
- Author: Bill Turner <dezrat1242@ispwest.com>
- Date: Mon, 16 Jan 2006 18:15:33 -0800
- Just had a long chat with W7AY on 7085 using very narrow RTTY. We started out with 170 Hz shift and then went to 23 Hz. I transmitted a canned macro (the word TEST repeated 36 times) at 100 watts, th
- /archives//html/RTTY/2006-01/msg00400.html (7,423 bytes)
- 2. Re: [RTTY] Narrow RTTY (score: 1)
- Author: Kok Chen <chen@mac.com>
- Date: Mon, 16 Jan 2006 18:39:01 -0800
- I had earlier played with Steve WB6RSE using 125 Hz shift (since it will fit into a 200 Hz bandwidth if you use the 1.2*shift + baudrate equation). Bill could only go to fixed shifts, so between W6WR
- /archives//html/RTTY/2006-01/msg00401.html (7,404 bytes)
- 3. Re: [RTTY] Narrow RTTY (score: 1)
- Author: Bill Coleman <aa4lr@arrl.net>
- Date: Mon, 16 Jan 2006 22:08:38 -0500
- In thinking of narrow shifts, you can theoretically get down to extremely small values. If you think of FSK as two OOK symbols spaced a short distance apart, there comes a point when the sidebands of
- /archives//html/RTTY/2006-01/msg00402.html (8,750 bytes)
- 4. Re: [RTTY] Narrow RTTY (score: 1)
- Author: "Joe Subich, W4TV" <k4ik@subich.com>
- Date: Mon, 16 Jan 2006 23:09:53 -0500
- The STA work was all done at 200 Hz shift, 300 baud ... I was a member of that group in the mid-to late 80's. The STA was issued to ARRL and the results were the basis for the (misguided) rules that
- /archives//html/RTTY/2006-01/msg00408.html (7,599 bytes)
- 5. Re: [RTTY] Narrow RTTY (score: 1)
- Author: Michael Keane K1MK <k1mk@alum.mit.edu>
- Date: Mon, 16 Jan 2006 23:51:51 -0500
- For non-coherent FSK, the minimum shift that will give orthogonality is a shift equal to the baud rate. Orthogonality (very loosely speaking) means that the nulls of the keying sidebands of the mark
- /archives//html/RTTY/2006-01/msg00410.html (9,294 bytes)
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