Hi Dave, sorry you been having so many problems.
Yes you are correct, that is, with the Rascal GLX all
you have to do is connect the soundcard cable, Mike
in, sound out, from the Rascal to you soundcard. The
other end of the Rascal go's to you computers comport
and give PTT and FSK. The third
Hi Bernie, Thanks for the info
Does the transformer have to be a 600 ohm, I have some junk boards here I may
be able to scrounge a few from, but not sure of their value. And yes I could
use one of them 4N35's I would gladly pay you for it. The schematic you
refered me to was one I was
Please allow me to make some comments based on research done here in San
Antonio.
As some may know, SouthWest Research Institute is located here in San Antonio
and has done work on high baud rate modes with very poor SNRs. Also they are
part of the current project that is flying a space craft
Forgive a relative newbie if this is a dumb question:
My QTH is East Cost USA (about 50 miles north of Boston). I've been
working PSK31 (and other digital modes) a few hours a day for about 4
months now. I haven't once even HEARD a station in Asia or Oceania.
I've had pretty good luck into
Nino,
That was kind of my thought...interesting about the Chip64 decoder...I will
have
to study the mode more.
In my post I did day that it was a 100 mile path but did not stipulate that is
was all over land. Also, unless you live in an area where the ground
conductivity changes a large
Will PAX2 beacon on 14.112 +1000Hz at 1 minute rate during day 23 Jan.
Connect and leave a msg if heard.
Any other pax/pax2 activity on HF bands?
de Rich/N2JR
If I understand it correctly, the raised cosine pulses tend to be more
efficient with power, reduce the crest factor (Pactor 2 is under 1.5),
and perhaps make it easier to have a cleaner signal.
Just for clarification I have a question: Is QAM modulation a form of
ASK? It would seem so to me
Hi Peter,
I'm just west of Philadelphia and I had the same problem for a few
months until I discovered a number of noice sources within my QTH. I
finally powered down the house except for my receiver and attached a dB
meter to the audio output and set things up on an idle frequency so I
was
At 02:03 PM 1/21/2007, you wrote in part:
There was no good reason to distort the tests by
inserting the specialized hardware, I believe that
Pactor I will run on a sound card, only Pactor II
and III are dependent on rare proprietary hardware
with rare proprietary software run under a proprietary
I'm always showing my ignorance, but what is cam. I kind of understand psk
and bqpsk as my ARD9800 uses bqpsk for the carriers carrying the voice data
and sst and ascii keyboarding function of the modem. Sorry to tie up the
group with an elementary question that I should know.
73s, Jack
--- In digitalradio@yahoogroups.com, [EMAIL PROTECTED] wrote:
Hopefully, your problem is that simple to identify and correct.
So how did you correct it? Did you just turn off everything that
causes noise when you want to use the radio, or did you find
effective ways of filtering out the noise?
Gee I have been doing it all wrong then.
My PACKET - AMTOR PACTOR station
runs on a Dell 200mhz system running
DOS 6.2 with YAPP (yet another packet program)
that cane out in 1985 or 86.
The SCS PTC-LLex pactor III TNC has not clue
what OS I am running.
John Becker wrote:
At 02:03 PM
The printer was replaced, the router had a bad 120V -12V power
converter and that was replaced, TV's remain a problem but are turned
off or powered down (and this is band dependent - one TV tears up 30M
while others do not). DVR is still a problem but I can normally work DX
when this guy is
John Becker wrote:
At 02:03 PM 1/21/2007, you wrote in part:
There was no good reason to distort the tests by
inserting the specialized hardware, I believe that
Pactor I will run on a sound card, only Pactor II
and III are dependent on rare proprietary hardware
with rare proprietary
Peter K1PGV wrote:
Am I simply listening at the wrong time, or in the wrong place
to find Asia/Oceania? Am I doing something else wrong?
Or is my setup here (TS-2K barefoot and a dipole at 60 feet)
simply too humble to allow my
signal to make the 6700 mile journey from Boston to Tokyo?
Although it is possible to run Pactor 1 on Linux, the comments have been
that it is not a very good implementation. I don't know if this is true
as I have never tried it, and the computers are much more powerful now.
In order to run Pactor 2 or 3, there is only one choice and that is the
SCS
Why do some modems use more rectangular waveforms instead of what
appears to be the optimum waveform for HF modems? Or are there downsides
to raised cosine waveforms?
In terms of bandwidth, it seems to me that for most uses, a 500 Hz
bandwidth is a wise choice. This seems to be a good tradeoff
Peter G. Viscarola wrote:
Forgive a relative newbie if this is a dumb question:
For me...not at alll
My QTH is East Cost USA (about 50 miles north of Boston). I've been
working PSK31 (and other digital modes) a few hours a day for about 4
months now. I haven't once even HEARD a
KV9U wrote:
If I understand it correctly, the raised cosine pulses tend to be
more efficient with power, reduce the crest factor (Pactor 2 is under
1.5), and perhaps make it easier to have a cleaner signal.
Raised cosine is, above all, less bandwidth greedy.
Just for clarification I
John Becker wrote:
At 02:03 PM 1/21/2007, you wrote in part:
There was no good reason to distort the tests by inserting the
specialized hardware, I believe that Pactor I will run on a sound
card, only Pactor II and III are dependent on rare proprietary
hardware with rare proprietary
I have done that with the audio up and the waterfall.
The video on the scene sends different levels of noise in certain
frequencies.
But the pulse power supply on standby also makes some noises. I did not
care what frequency,
I just wanted the noise abated, that means SUPPRESSED.
Unplugging
I am a little behind the curve on the various modes and how they are created
but in looking at the specs on my ARD9800 Digital modem, it baud rate can run
as high as 3600 but of course under ideal conditions with a band width ofapprox
2.6 khz. Besides voice, it does sstv, file transfer using
Jack,
From what I can see in the specifications of your unit, this is a 36
tone (carrier) DQPSK system running at 50 baud. The total throughput is
the 3600 bps (bits per second) rate.
You could theoretically use a 3600 baud system (if you could actually
get it to work in the HF bands) for
--- In digitalradio@yahoogroups.com, kd4e [EMAIL PROTECTED] wrote:
John Becker wrote:
At 02:03 PM 1/21/2007, you wrote in part:
There was no good reason to distort the tests by
inserting the specialized hardware, I believe that
Pactor I will run on a sound card, only Pactor II
and
I have four 4N29s in my stock. I'll send you one for free. I think the 4N29
will do the trick. The 4N29 will give 2500 Vdc isolation. They cost 20 cents.
Please confirm your address off list to my E-mail at [EMAIL PROTECTED] and I'll
pop one in the mail for you.
The transformer can be
Hi Rick and thanks for helping me to understand some of the finer points of
data vs digital voice. When PSK31 first got started a few years ago, I got a
rig interface for my Kenwood 570DG I owned at the time and worked it very well
for a couple years. I am blind and had to arm wrestle my
Claiming that you need to use MS-Windows for Pactor is absolutely
false, and shows that you're just spewing your ignorance. I have no
idea why - maybe you have some agenda, and maybe you're just like to
talk about things regardless of your actual knowledge. But the record
needs to be set
It requires a SCS multimode box and a Pactor III license. OS can be
whatever
that communicates with the box. I have used MSDOS, Windows and Linux, so
the OS is not an issue. It is just communicating a DTE with a DCE. SCS
uses a
form of advanced host mode that requires a suitable program to
Peter G. Viscarola wrote:
Forgive a relative newbie if this is a dumb question:
My QTH is East Cost USA (about 50 miles north of Boston). I've been
working PSK31 (and other digital modes) a few hours a day for about 4
months now. I haven't once even HEARD a station in Asia or Oceania.
You hear this said quite a bit about the propagation during the bottom
of the sunspot cycle. But is that directed toward any particular band?
It seems to me that the lower bands can actually get better for longer
distance (mostly nightime and grayline) propagation.
Or are you saying that the
I am considerably South of you (Virginia), but also do not have all that many
PSK contacts into Asia, and have been doing it for a few years, including in
much better sunspot conditions. I have 129 countries, out of 708 PSK contacts,
but by far Europe and S American/Carribean are the majority,
Jack,
I can imagine the challenge for being blind and working with a Windows
computer today compared to the early text based machines. Recently,
there was an article in QST written by two blind hams who developed an
add-on for one of the MFJ antenna analyzers. Ironically, they pointed
out
Gee Rick, you mean the whole telephone system, inclulding cells were out for
one cut? Sounds like they need to do some backup planning at the phone
company too.
Danny Douglas N7DC
ex WN5QMX ET2US WA5UKR ET3USA
SV0WPP VS6DD N7DC/YV5 G5CTB all
DX 2-6 years each
.
QSL LOTW-buro- direct
As courtesy
Hi Danny,
Not the local phone company, but the cell phone system for the area and
long distance were disconnected due to the fiber cut. They have no
alternative routing since there is only the one fiber that everything
has to pass through to get out of the area and get to the cell towers
and
Gee, Mostly out west there are microwave towers across country for the long
distance, and I suspect those also carry the backbone for the cells now too.
I dont see many MW -only towers around here thogh. Mostly its fiber cable
here too, that I see running all the way up to D.C. I hope they have
SDRs Open the Possibility for 18kHz Bandwidth HF Data
providing more robust communications and higher speed data.
With new Software Defined Radio (SDR) transceivers that use
computer audio as the IF and DSP for filtering and modem,
wider bandwidths than the traditional 3kHz SSB transceivers
36 matches
Mail list logo
