ssage-
From: digitalradio@yahoogroups.com [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 be
talra...@yahoogroups.com]
On Behalf Of Rick W
Sent: Thursday, March 26, 2009 5:09 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 pr
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. Putting this capability together with
its automatic adaptibility for conditions, it may be the break though of
the y
sday, March 26, 2009 2:48 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] No FCC data bandwidth limit on HF Re: USA
ham rules
> Except for the fact that PSK has no error correction, no compression,
no
> formatting capabilities and no way to accurately > know if the traffi
> 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 t
al Message-
From: 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 wh
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" wrote:
>
> --- In digitalradio@yahoogroups.com, "Dave AA6YQ" wrote:
> >
--- In digitalradio@yahoogroups.com, "Dave AA6YQ" 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
> " 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 le
ly .
Let reason prevail
Bruce
--- On Thu, 3/26/09, David Little wrote:
From: David Little
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 know some thought went into
on
Sent: Thursday, March 26, 2009 6:45 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 o
. .
--- On Thu, 3/26/09, kh6ty wrote:
From: kh6ty
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 on the Cohen paper, is
that the
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
st
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 20).
> 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
hift and symbol 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 ban
> 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
yahoogroups.com [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
> 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
0 Khz wide?
73,
Dave, AA6YQ
-Original Message-
From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com]on
Behalf Of expeditionradio
Sent: Wednesday, March 25, 2009 9:58 PM
To: digitalradio@yahoogroups.com
Subject: [digitalradio] No FCC data bandwidth limit on HF R
> 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 a
> 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 moder
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