There is no equipment for the emission
to be FSK or PSK.
This should read there is no requirement for the emission to be FSK or PSK.
73,
Mark N5RFX
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
Other areas of interest:
The MixW Reflector :
I just searched for usb sound cards and used a shopping network, like nexttag,
though I do not remember which one The device was $9.95 US and $4.50
shipping.
73 de Ken/KC9FOA
-
Stay in the know. Pulse on the new Yahoo.com. Check it
Steve,
If you have all the MIL-STD-188-110 features, let me ask four questions.
1) What is the maximum baud rate or symbol rate of the single PSK carrier?
2) Have you found that the un-coded 4800bps signal works on normal HF SSB
transceivers?
3) What is the robustness of the 2400 and 4800
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Thursday, August 31, 2006 11:56 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] USA; Baud Limit = 300 Symbols Per Second (HF
Digital Data)
[stuff deleted]
This might be true if the 64
Can you explain how it is that you can run a symbol rate of 2400 (baud)
with 188-110A and it works very well running at this extremely high
speed for HF? And yet other modes, such as Packet, don't work very well
at 300 baud, and Walt has pointed out that government studies had show
that under
So what would be the difference if I transmitted 64 tones/carriers each
modulated at 300 baud but transmitted them through one transmitter or 64
tones/carriers through 64 transmitters into one antenna?
Walt,
From a regulatory standpoint I don't think there is a problem. I think
that Pawel
I wasn't picking on Pawel at all...I just used MT63 as an example.
My Point was that if you applied a 300 baud/symbol rate to one
carrier/tone-tone/carrier and trasnmitted it with one transmitter and had 64
trasnmitters running in the same band or running 64 tones with 300 baud/symbol
rate
The 2400 and 4800 baud is a composite baud rate for the mode/protocol NOT the
discrete baud rate of any individual component of the waveform.
Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Friday, September 01, 2006 11:07 AM
To:
I wasn't picking on Pawel at all...I just used MT63 as an example.
Walt,
I understand. My diatribe was to make the point that the occupied bandwidth
has a bearing on the general acceptance of a mode.
73,
Mark N5RFX
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
The 2400 and 4800 baud is a composite baud rate for the mode/protocol NOT
the discrete baud rate of any individual component of the waveform.
Can you explain further? I saw that:
MIL-STD-188-110A serial tone modem is just that, a single PSK carrier
frequency that by the standard is locked
Hi Walt,
At 10:27 AM 9/1/2006, you wrote:
Steve,
If you have all the MIL-STD-188-110 features, let me ask four questions.
1) What is the maximum baud rate or symbol rate of the single PSK carrier?
There is a SINGLE carrier. The standard symbol rate is fixed at
2400bps all the time.
Some
Oh yes...for many/most folks and even me when I am chatting or even sending a
file. But when I am in a disaster operation, I need to send BIG files and
FAST, with no errors and under poor ionospheric or atmospheric conditions. At
that point in time band width is not relevant.
Amateur radio
AA6YQ comments below
--- In digitalradio@yahoogroups.com, DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
snip
In the case of 40M, if each data channel (mode bandwidth) is 5 KHz
wide, there would be room for 25 QSOs. I RARELY hear 25 QSOs between
7000 and 7150 KHz on any given
Hi Mark,
The Mil-Std-188-110B serial (single-tone) mode use M-ary Phase-Shift
Keying (PSK) on a single carrier frequency (1800hz standard) as the
modulation technique for data transmission. The serial binary
information is converted into a single 8-ary PSK-modulated output
carrier where
Hi Mark,
I just seen this after sending you a reply...
You go the idea, you actually put it forth simpler than I did as gave
you too much detail, but yet just touched the tip of it ! I may have
to save your explanation below for a more simple reply in the future,
but I can never seem find
Walt,
There are typically layers of stations on many of the bands. It
depends upon your antenna system and to a certain extent, operator
skill, when attempting to work really weak stations. It is not uncommon
for wall to wall signals where you can not find a decent open area. Not
to mention
Hi Rick,
At 01:24 PM 9/1/2006, you wrote:
Can you explain how it is that you can run a symbol rate of 2400 (baud)
with 188-110A and it works very well running at this extremely high
speed for HF? And yet other modes, such as Packet, don't work very well
at 300 baud, and Walt has pointed out that
AA6YQ asked
--- In digitalradio@yahoogroups.com, DuBose Walt Civ AETC CONS/LGCA
[EMAIL PROTECTED] wrote:
snip
Either you have a very poor 40m antenna, or you're only listening
during coronal mass ejections. Over the last couple of evenings,
there have been 10-15 stations in 40m PSK segment
Hi Dave,
I really could not say for sure based on your criteria, depending on
what you mean as asked.
However using ALE and an appropriate Global Allcall or Anycall is
very powerful. If the propo is there for the given frequency at the
given time of the call, if there were 1,000 stations
Hi Dave,
Regarding the Sounding aspect of life, not all stations need to be
Sounding and not all stations need to be Sounding once per hour.
Sounding can be adjusted to accommodate the loading of a network. The
more stations that are ALE active on the same channel less frequent
you sound and
Mark,
I think I understood you to say earlier that the baud rate is based upon
the total waveform. I am having difficulty grasping what that really
means. I have spent a LOT of time researching this on the internet and
not really finding something that I can picture in my mind like I can
with
Walt,
While I agree with most of what you wrote, there has been so much press
and information the past few years that I would expect most hams to have
a pretty good understanding of low angle DX vs. high angle NVIS antennas.
As long as the dipole is not higher than a quarter wave, you should
If I gave you some parameters of a waveform, what would you use to base
your measurement of baud rate?
I would look at the data, and see how it is modulated into an analog
waveform. For FSK we know that a 1 produces one symbol, and a 0 another
symbol. MFSK16 the symbols represent
0001
On HF, I have used the fast PSK modem built into PCALE for sending JPG
and GIF image files in the 20 meter phone band. FS-1052 / MIL STD
188-110.
If anyone else would like to experiment with this, I'm interested in
QSOs. It is a way for US hams to use this cool fast soundcard modem
while
Bonnie,
I will give it a shot if we can get a link between us. I can start
scanning the 20 meter channels.
73,
Mark N5RFX
At 07:25 PM 9/1/2006, you wrote:
On HF, I have used the fast PSK modem built into PCALE for sending JPG
and GIF image files in the 20 meter phone band. FS-1052 / MIL STD
OK, Mark.
I saw WA3MEL linking with you earlier on 20m, but could not see your
sigs at that time. I just now linked with WB6MLC right now on 14342.5kHz.
Bonnie
--- In digitalradio@yahoogroups.com, Mark Miller [EMAIL PROTECTED] wrote:
Bonnie,
I will give it a shot if we can get a link between
Mark,
When I visualize the MT-63 waveform, it seems like many little tones
turning off and on, but all running at a very low baud rate. Thus the
low baud rate for the mode even though it is a huge width of spectrum.
All these years we were told that low baud rates worked better under
poor
What? That was basically unintelligible.
Mil Std 188-110-A1 2400 baud serial modem combines several features to
mitigate the channel.
Furthermore TWENTY FOUR HUNDRED BAUD DOES NOT MEAN 2400 bps. It
almost never does. What happens in the modem is multiple 2400 baud
symbols are put
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