Yeah, but at what data rate? Uncoded BPSK bandwidth
is usually about 1.4 times the data rate depending
on the pulse shaping used in the modulator. 31 Hz would
imply a data rate of around 22 bits/sec. If you are using
8 bit ASCII for coding, this implies 2.8 characters of
text. If I understand the definition of a morse "word"
correctly (not sure that I do), this is about the same
as 40 wpm CW. More efficient coding of the data in the BPSK
link would of course stack the deck in favor of PSK a bit
more though.
73 de Mike, W4EF..........
----------
From: Bill Turner, W7TI[SMTP:wrt@eskimo.com]
Reply To: wrt@eskimo.com
Sent: Friday, January 29, 1999 12:15 AM
To: T A RUSSELL
Cc: AMPS@contesting.com
Subject: Re: [AMPS] ARRL and QST (and CW Relevance)
On Thu, 28 Jan 1999 09:07:20 -0600, T A RUSSELL <n4kg@juno.com> wrote:
<snip>
>On the technical side, CW is capable of producing the
>highest Signal to Noise ratio because it has the narrowest
>Bandwidth of all modulation systems. That alone keeps it
>"relevant" as a viable means of communication under
>adverse conditions.
>
______________________________________________
Sorry Tom, if bandwidth is the measure of relevance, CW has just lost
out. PSK (phase shift keying) is now available to any amateur with a
16-bit sound card in his computer and an SSB rig. The total bandwidth
required is an incredible 31 Hz. You can download the FREE software
at:
http://bipt106.bi.ehu.es/psk31.html
There are several versions available depending on your operating
system and soundcard. Most folks will probably want the one for
Windows and Soundblaster. Included is an extensive help file which
will get you started.
So back to your statement about relevance....
73, Bill W7TI
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
--
FAQ on WWW: http://www.contesting.com/ampfaq.html
Submissions: amps@contesting.com
Administrative requests: amps-REQUEST@contesting.com
Problems: owner-amps@contesting.com
Search: http://www.contesting.com/km9p/search.htm
|