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
In n-ary FSK, if all tones in the ensemble have identical maximum magnitudes,
then isn't it true that the maximum bandwidth will be identical that of binary
(2-tone) FSK with a shift whose value is difference in frequency between the
highest and lowest tones in the ensemble?
73,
All,
Thanks to all who participated in the Contestia tests this evening. It
certainly seems to have an advantage over MT63 in terms of sensitivity. Patrick
Lindecker pointed out the mean-to-peak power ratio differences between the two
and is no doubt the reason why Contestia is the more
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
Tony,
Had a good copy on you in MT63 and Contestia. It took a while to get MixW set
up again and my temporary rig setup is unstable on transmit. You did have a
strong signal to the Gulf Coast around 2330 until my crude wire lash up came
undone. Just my luck...
Rich
WA4SXZ
--- In
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 became the standard.
With bands like 220 MHz sitting there dead one would think wide band on 20
meters
would be the last thing we see. .
My rule of thumb for FSK is:
Bandwidth is greater than Shift.
On the surface, that may seem quite
simplistic :) But, the deeper one looks,
the more one finds that this is just about
as far as one can go in making a universal
statement of truth in the relationship between
bandwidth and shift
I know some thought went into that reply, and that it has merit if we
are only concerned with short-range communications.
However, no matter how wide, narrow, thick or thin the emission, you
cannot expect the same range on 1 1/4m as you can on 20m - so I am not
sure the statement has any merit
Hi Andy, I all so used the pull down secltion (TS-450s) option, my interface
for the radio is home made it works fine with (HRD-MMTTY-Commander) it control
the radio as in (Txing-freq tracking-change mode), I all so check commander to
see how the (RTS and DSR) was set and set the same in
Russell,
If you look at the fldigi HamLib selections, the TS-450S is listed as a beta
version (which means it probably does not work! hi!)
Instead try using RigCat with fldigi and download the TS-450 xml file from this
link: http://www.w1hkj.com/xmlarchives.html
Put the file in the Rigs
Dave
After 40+ years most of them on 6 meters I understand 220 is not going as far
as 14 mhz does
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.
PERSONLY i'm on 20 with psk31 as is my brother
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, expeditionradio expeditionra...@...
wrote:
Hi Andy,
There is no simple universal relationship between
the shift and the transmitted signal bandwidth,
However, for the particular case of binary FSK where the
shift is wide compared to the bit rate, you
--- 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
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.
Fortunately, most Winlink traffic is moved on NTIA spectrum, where it is
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
Hi Skip, I have tryed both files and all the setting combo, I guess the default
is n-8-1 and I set the speed at 4800.
Yesterday is HISTORY. Tomorrow is a MYSTERY. Today is a GIFT! Thats why its
called the PRESENT!
IN GOD WE TRUST
Russell Blair (NC5O)
Skype-Russell.Blair
Hell Field
You have to set the baud rate at whatever your transceiver requires. It is
probably stated in the manual.
73, Skip KH6TY
http://kh6ty.home.comcast.net
- Original Message -
From: Russell Blair
To: digitalradio@yahoogroups.com
Sent: Thursday, March 26, 2009 3:11 PM
Subject:
I still don't understand why anyone would want the increased
complication of using RigCat if the Hamlib works well for you. There are
no files to put anywhere. It just works for me. I think I tried it on
one of my wife's ICOM IC-7000 rigs, and I could also test it on my ICOM
746 Pro as
Agreed that this is the best approach.
Do you find that a given rig (such as an ICOM 756 Pro series) that is
supported by Hamlib, will work with some rigs and not with others of the
same exact model and set up?
I have used the West Mountain RigTalk interface and my homebrew
interface for the
Yes got it set to 4800 per the book and commender program. RTS=+V as well.
Russell
Yesterday is HISTORY. Tomorrow is a MYSTERY. Today is a GIFT! Thats why its
called the PRESENT!
IN GOD WE TRUST
Russell Blair (NC5O)
Skype-Russell.Blair
Hell Field #300
DRCC #55
30m Dig-group #693
--- On
Rich,
Had a good copy on you in MT63 and Contestia. It took a while to get MixW set
up again and my temporary rig setup is unstable on transmit. You did have a
strong signal to the Gulf Coast around 2330 until my crude wire lash up came
undone. Just my luck...
Thanks for trying om. Sorry
All,
I'm QRV Contestia 16/1K, MT63-1K on 14108.0 USB + 1000Hz. It's 22:15 utc, March
26. I'll be listening till 00:00 utc.
Tony -K2MO
Tony,
Cannot hear you at all, but copy VE5MU S-5. On MT63-1000, Multipsk is OK, but
print on fldigi is all run together like this:
THEPRINTISALLRUNTOGETHER.
Contestia print on John was poor compared to MFSK16.
73, Skip KH6TY
http://kh6ty.home.comcast.net
- Original Message -
Skip,
Have the antenna to toward John. Yes, he was having trouble with Contestia /
MT63 when using Multipsk. Was seeing the same thing here; characters were
running together.
Tony -K2MO
- Original Message -
From: kh6ty kh...@comcast.net
To: digitalradio@yahoogroups.com
Sent:
Rick,
I am excited about Winmor. I have been alpha testing PaclinkW, which
incorporates Winmor, Packet, Pactor and Telnet.
It provides rig control, accepts email from and ports email to Outlook
or Outlook Express.
The Winmor implementation in PaclinkW (much to the dismay of the
re The Winmor implementation in PaclinkW (much to the dismay of the
naysayers) has busy channel transmit control enabled.
I and others strongly encouraged Rick KN6KB to provide a busy frequency
detector in SCAMP. We were optimistic when he agreed to give it a shot, and
thrilled by the
Hello Dave, I was there during those scamp beta testing adventures too
. and I remember that part of the evaluation. Various levels were played
with, akin to a sensitivity level. Bottom line to me was that when the level
made it 'work' ie, not transmit when the frequency was 'active',
I should point out that in my tests of the Alpha version PackinkW (with
Winmor) the busy detect worked. I only tried it a few times , and not under
all conditions, but several times WINMOR told me the frequency appeared busy
and asked me if I really wanted to start a transmit.
--- In
-
As an aside, if you really want to see something that is slick, give Easy
Pal a shot for sending text. Also ultra high resolution pictures with no
scan lines that occupy 20KB of data on each end. 90 seconds to send or
receive, with the ability to only request the individual blocks that
It is true that the long history of WinLink PMBOs QRMing in-progress QSOs
has generated more than a little frustration and anger. Some small
percentage of those so affected are alleged to have stooped to similar
misconduct -- intentionally QRMing WinLink transmissions in revenge. Over
the years,
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