Dave AA6YQ wrote:
Please identify the significant factors...
Hi Dave,
Some of the answers you seek are in a previous
message:
http://groups.yahoo.com/group/digitalradio/message/30581
I will leave the rest up to you to determine.
73 Bonnie KQ6XA
Thanks, Bonnie.
According to the formulae presented in table 2 on page 49 of the document you
cite below, binary (2-tone) FSK with a maximum shift of 1 kHz and a maximum
symbol rate of 300 baud would require a maximum bandwidth of 2011 hz. for any
practical modulation index (i.e. less than
The short answer, as Steve Ford likes to say, based on the Cohen paper, is
that the necessary bandwidth appears to be roughly twice the frequency
shift, although an exact calculation is obviously very complicated.
More importantly, with regards to the amateur radio service is the summary
. .
--- On Thu, 3/26/09, kh6ty kh...@comcast.net wrote:
From: kh6ty kh...@comcast.net
Subject: Re: [digitalradio] No FCC data bandwidth limit on HF Re: USA ham rules
To: digitalradio@yahoogroups.com
Date: Thursday, March 26, 2009, 6:00 AM
The short answer, as Steve Ford likes to say, based
AM
To: digitalradio@yahoogroups.com
Cc: wa4...@yahoo.com
Subject: Re: [digitalradio] No FCC data bandwidth limit on HF Re: USA
ham rules
Things go round and around
Back 70 years ago the FCC band SPARK GAP because it was wide
and interfered with other stations. CLEAN NARROW signals
reason prevail
Bruce
--- On Thu, 3/26/09, David Little dalit...@bellsouth.net wrote:
From: David Little dalit...@bellsouth.net
Subject: RE: [digitalradio] No FCC data bandwidth limit on HF Re: USA ham rules
To: digitalradio@yahoogroups.com
Date: Thursday, March 26, 2009, 7:22 AM
I
Moving traffic IS NOT what 99% of hams want to do on 20 meters working
DX IS.
And this band is filled with stations doing just that.
I think you are quit right, Bruce, and the Winlink 2000 network is probably
currently the most efficient say of moving traffic, but that interests less
--- In digitalradio@yahoogroups.com, Dave AA6YQ aa...@... wrote:
Thanks.
To repeat my first question, What's the bandwidth of an FSK signal whose
shift is 1 kHz and whose symbol rate is limited to a maximum of 300 baud?
Feel free to parametize as necessary.
Using the approximation I just
Thanks Jim -- your result is within 10% of what's predicted by the formulae in
the paper Bonnie cited, which considered a few more factors.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, jhaynesatalumni jhhay...@... wrote:
--- In digitalradio@yahoogroups.com, Dave AA6YQ
: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com]
On Behalf Of kh6ty
Sent: Thursday, March 26, 2009 11:16 AM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] No FCC data bandwidth limit on HF Re: USA
ham rules
Moving traffic IS NOT what 99% of hams want to do on 20 meters
Except for the fact that PSK has no error correction, no compression, no
formatting capabilities and no way to accurately know if the traffic was
delivered properly other than read back, your figures are fairly accurate.
David, check out our NBEMS system at www.w1hkj.com/NBEMS
Many of the
:09 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] No FCC data bandwidth limit on HF Re: USA
ham rules
David,
The thing that I find particularly attractive about WINMOR is that it is
an open sound card protocol and it can be used in three forms:
200 Hz, 500 Hz, and 2000 Hz modes
[mailto:digitalra...@yahoogroups.com]on
Behalf Of David Little
Sent: Thursday, March 26, 2009 10:03 PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] No FCC data bandwidth limit on HF Re: USA ham
rules
Rick,
I am excited about Winmor. I have been alpha testing PaclinkW, which
incorporates Winmor
Dave AA6YQ wrote:
There is unquestionably a bandwidth restriction
on HF for frequency-shift keying,
Hi Dave,
Sorry, old friend, but you are incorrect.
In the USA data/RTTY bands 160meters-10meters,
the FSK rule is a shift restriction. It is
not a bandwidth restriction.
The attempt
Dave, AA6YQ wrote:
Do you think its a good idea for amateurs to
transmit 150 Khz-wide signals on HF bands
like 20m that are 350 Khz wide?
Hi Dave,
Yes. There are certainly conditions now that
would be perfectly fine for 150kHz bandwidth
signals to be used at power levels that would
[mailto:digitalra...@yahoogroups.com]on
Behalf Of expeditionradio
Sent: Thursday, March 26, 2009 12:31 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] No FCC data bandwidth limit on HF Re: USA ham rules
Dave, AA6YQ wrote:
Do you think its a good idea for amateurs to
transmit 150 Khz-wide
Dave AA6YQ wrote:
What's the bandwidth of an FSK signal whose
shift is 1 kHz and whose symbol rate is limited
to a maximum of 300 baud?
Hi Dave,
The question provides insufficient data to
derive a simple universal answer.
Bonnie KQ6XA
rate.
73,
Dave, AA6YQ
-Original Message-
From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com]on
Behalf Of expeditionradio
Sent: Thursday, March 26, 2009 1:27 AM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] No FCC data bandwidth limit on HF
k2ncc asked:
...is it legal to transmit on the digital modes
sub-bands modes that are greater than 1000 wide,
like Olivia 2000?
Yes. Under the present content-based rules for
hams in USA, FCC has confirmed that there isn't
really a specific bandwidth limit for most types
of modern
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