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[hfsig] bytes per minute

DuBose Walt Civ AETC CONS/LGCA Walt.DuBose at RANDOLPH.AF.MIL
Wed May 18 12:28:34 UTC 2005


Ok...thanks.

Then if MT63 has a user throughput of 200 WPM, then this is 1200 CPS or 7200
Characters per minute (cpm).  If a character is considered one byte, then
7200 cpm is 7200 bytes/minute.

Walt/K5YFW

-----Original Message-----
From: hfsig-bounces at lists.tapr.org
[mailto:hfsig-bounces at lists.tapr.org]On Behalf Of chris at yipyap.com
Sent: Tuesday, May 17, 2005 4:23 PM
To: hfsig at lists.tapr.org
Subject: [hfsig] bytes per minute






I understand 'Net' bytes per minute to be the rate
of "user" data through the channel.  The channel
itself may involve compression, forward error correction
or other methods which increase or decrease the
number of bytes per second put through the channel
to achieve that level of user data flow.



According to this page,
http://www.qsl.net/zl1bpu/MT63/Technical.html
the rate for MT63 is 20 characters per second with
a 2khz bandwidth, which would be ~ 20 Bps, and 160 bps.
That would be (20 * 60 ) 1200 Bytes per minute.

Twenty characters per second, 5 character "words", 60 seconds
per minute, would give 240 WPM (?)

This page:
http://www.arrl.org/FandES/field/regulations/techchar/PACTOR-II.html
says Pactor II max is 1200bps, roughly 7.5 times faster.



Chris
kc0atc



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