Dave Corio wrote:
As a side note, I have to wonder if the 000 sent might be the
amount of DF noted on the other station's frequency? If the station
responding is down 30 Hz from the calling station's frequency, might
that be changed to -030? Haven't seen anything in any of the
manuals,
Sergio Manrique Almeida wrote:
I managed to run it on HTTP mode, as couldn’t find UDP ports to
unblock on XP.
Regards,
Sergio, EA3DU
-Mensaje original-
I have used nistime-32 where firewalls do not block time synchronization.
Works very well.
At home, I am using F6CTE' s
Andrew O'Brien wrote:
From W7GJ
ADDITIONAL TIPS FOR USING JT65 IN WSJT VERSION 5.9.2
* TUTORIAL. Study the new tutorial at
http://pulsar.princeton.edu/~joe/K1JT/Tutorial_590.txt
Got a 404 error on this link. Can someone tell the right one if not
already outdated ?
73,
Jose, CO2JA
Steinar Aanesland wrote:
Strange! It is crowded on 14.076 right now!
73 de LA5VNA Steinar
And on the sides too...I see quite a few that do not like to make lines
until the frequency clears up.
73,
Jose, CO2JA
__
V Conferencia Internacional de
Thank you, Chuck. That one works, but that tutorial seems to be
outdated. I did not find it there.
Nevertheless, I already copied all the pdf' s there.
73,
Jose, CO2JA
Chuck Mayfield wrote:
Try http://physics.princeton.edu/pulsar/K1JT/Documentation.htm
73, Chuck, AA5J
Walt DuBose wrote:
As far as I can tell, there is a very large use of FEC which of
course cuts down on the amount of user data throughput.
Additionally, with 65 tones, I believe that the signal is wider than
500 Hz. Hi Hi.
Yep!...it was meant for VHF and up...
1. In earlier versions the
Chris Danis wrote:
On 4/4/07, Jose A. Amador [EMAIL PROTECTED] wrote:
Are all those DIAL frequencies?
Jose,
Yeah, dial frequencies. Audio frequencies typically used for JT65 (at
least in every QSO I've seen/worked) have been around 1200Hz.
best 73,
-chris N2YYZ
RGRthanks
I finally read the WSJT manual, quite quickly indeed, and from it I
could gather the following:
Encoded user information is transmitted during the 63 intervals not
used for the sync tone. Each channel symbol generates a tone at
frequency 1275.8 + 2.6917 Nm Hz, where N is the value of the
Steinar Aanesland wrote:
Hi Jose
My radio was monitoring 40m last night when I was sleeping . My antenna
is a homemade vertical dipole for 20m
and I was surprised to see your signal on my screen this morning.
Would you make it another try to night and I promise you I will stay
awake to
John Becker wrote:
I still can't get any output audio with this program Anyone else
having a problem?
Any Ideas?
John,
I am not sending you to Read The F...ine Manualbut it would be fine
if you did.
I stumbled into it.every sound device is characterized by a number,
every input
We are using the SAME version.
As I see it, using 0 for input and 2 for output should work for you.
It it does not, I am afraid it is a strange Windows quirk
Anyway, check for conflicts (address and IRQ) and in configuration --
system, make sure you haven't got a yellow question mark...
Chris Danis wrote:
On 4/5/07, Chris Danis [EMAIL PROTECTED] wrote:
So now I have XE on 40m. What a fun mode.
And now, ZS as well -- which is a new entity and a new continent for
me. Thanks to Willem ZS6WAB! My best RX of his signal was -13dB SNR
and his best RX of mine was -16dB.
Andrew O'Brien wrote:
I see a few are confused about the proper sequence and meaning of the
EME/MS related messages within JT65A of WSJT. So, am I.
I wonder if us HFer's should try to be more straight forward? The
general use is described as..
When a station copies both calls, he
Simon Brown wrote:
Hi Patrick,
What I am doing is providing the same support as Digipan MixW. Nick
Fedoseev sent me the mapping he uses, it's more-or-less Windows 1251
- see http://www.microsoft.com/globaldev/reference/sbcs/1251.mspx .
There are some differences though.
Are you
Andy,
Are all those DIAL frequencies?
Jose, CO2JA
--
Andrew O'Brien wrote:
Alan,
The software contains no reference to HF and the listed bands are 6M
and above. Use of it on HF has started within the past couple of
weeks. The JT65A is the mode that people are using on HF, not the
And now... back to discussing the FCC and Winlink,
__
V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación
Energética.
22 al 25 de mayo de 2007
Palacio de las Convenciones, Ciudad de la Habana, Cuba
Agree. Having my own opinion, I have refrained to participate lately on
the ongoing threads because
what I see in the bottomline is hate, and my way or no way on mails. It
is a waste of time.
It is a pity all the space wasted here with another list available for
such discussions.
I am not
Dave Bernstein wrote:
the hidden transmitter effect is a myth,
Have you already programmed a cyberionosphere responding to your wishes?
C'mon! Be realistic.
Jose, CO2JA
__
V Conferencia Internacional de Energía Renovable, Ahorro de Energía y
I would say it depends a lot on the ops and the bands. On 6, a common HF
distance becomes DX, and on 2 meters, Puerto Rico, Baltimore, or even,
Grand Cayman is DX. YMMV
Jose, CO2JA
-
DuBose Walt Civ AETC CONS/LGCA wrote:
HumDXing is the hobby of tuning in and identifying
Here in Cuba we do not have those freebanders, but sometimes I can
hear them on 7000, 1, and even 14103 yesterday, with quite coarse
language.
Here in Havana we get quite strong QRM from the european broadcasters
starting on 7105 since a bit earlier of sunset until sunrise in Europe,
Robert Meuser wrote:
Switzerland
It would beon the Internet
Dave wrote:
What is CQ CH? I'm used to seeing CQ WY, or CQ ID, or even CQ KL7,
but CH has me puzzled. Just heard it on PSK31 on 30 meters.
Tnx es 73 Dave KB3MOW
It is CQ (C)ounty (H)unters.he, he...
73,
o. wrote:
Hi group
Where can I download theRFSM software from?
73
Omar YK1AO
Omar,
The temporary site is http://rfsm2400.narod.ru
73,
José, CO2JA
__
V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación
Dave Bernstein wrote:
As is often the case in engineering, Jose, perfect is the enemy of
good. What Rick KN6KB discovered while developing SCAMP's busy
detector was that he could detect CW, PSK, Pactor, and SSB at an ~80%
confidence level without enormous difficulty. SCAMP beta testers
jgorman01 wrote:
Just a few thoughts:
* A busy detector is not a panacea for all qrm, especially as you
look at the lower bands. I can easily lay out a scenario for 80
meters or daytime on 40m where the PMBO should transmit when the freq
is busy. This scenario happens less as you
Roger J. Buffington wrote:
That is certainly disappointing. What software do you use to take a
screenshot? Will it work with MixW?
de Roger W6VZV
You could try with a simple Print Screen dump to the clipboard, and then
paste it to Paint, Photoshop or whatever.
I use Gadwin Print Screen
zone
is being disregarded repeatedly.
Period.
Jose, CO2JA
PS: I do own a cellphone and also watched LIVE the first steps of Neil
Armstrong on the moon.
---
Prof. Jose A. Amador, E.E., MSc.
AMSAT-NA LM 1209
Linux User 91155
__
V Conferencia
Kurt wrote:
Unfortunatelly all this name calling and mode bashing (you know,
the mode I support is better than yours etc) does not promote
digital radio at all.
73 de Demetre SV1UY
I am not bashing any mode, as I use most of them at one time or
another, and trying my hand at ALE
.
Jose, CO2JA
Dave Bernstein wrote:
AA6YQ comments below
--- In digitalradio@yahoogroups.com, Jose A. Amador [EMAIL PROTECTED]
wrote:
Seems I did not make my point. A large portion of Winlinks popping
out of nowhere is because some H I D D E N (in the skip zone)
user has triggered
Rich Mulvey wrote:
Kurt wrote:
I'm afraid that there is no simple solution to the problem of who
is working what mode where. But each operator must be diligent to
try as best possible not to QRM another signal on the portion of
the band that they are working.
If others are not hidden
A fact proven with quite a few QSO's with KP4 there. The others are not
in my neighborhood (and even Puerto Rico is more than 2000 km away).
Canadians can also work much lower. I was a regular check-in of a SSB
canadian net on 7063.5 kHz some time ago.
Jose, CO2JA
---
Roger J. Buffington
I have been working repeatedly into ZS and 5R4 on 40 m since November, a
bit before their local sunrise. ZS6BUN has quite a good signal here, for
that distance.
Jose, CO2JA
---
Leigh L Klotz, Jr. wrote:
Last night I heard ZS6BUN on 40m above a little above 7070. Dick's
signal got
:
If you know the exact frequency, I will add it to the list.
Bonnie KQ6XA
--- In digitalradio@yahoogroups.com
mailto:digitalradio%40yahoogroups.com, Jose A. Amador
[EMAIL PROTECTED] wrote:
I have been working repeatedly into ZS and 5R4 on 40 m since
November, a
bit before
larry allen wrote:
Greetings... Now, I don't know whether to feel awkward or not... What
is Olivia?... Larry ve3fxq
Olivia is the daughter of Pawel Jalocha.
He named the new mode created by him after his daughter. It is MFSK
plus a layer of Walsh code.
Very versatile in tones,
Roger J. Buffington wrote:
David Kruh wrote:
Thanks again for everyone who has chimed in. The contest this
weekend has made contacts difficult, but conversations with WD4KDK,
N0TAO, N7AXL, and W0CYF and reading the postings I am pretty sure
that between Windows Me (a real piece of
scottbomb wrote:
This is what I do with my computer/IC-706 setup. Most likely, the
sound output from the computer is stereo (I've never seen a mono out
on a comp.) but you can use a mono plug and it will send 1 channel to
the radio.
I would NOT advise a MONO plug on a line output. It short
KV9U wrote:
When John, VE5MU, claims to be transmitting on 14109.5, he is
actually centering his transmitting frequency on 14.110.
No, 14111.14109.5 kHz + 1.5 kHz
I did have to tune around, but I finally found him.
Of course, it is easier to state the RF center frequency.
The rest is
Andrew O'Brien wrote:
I received a Skype call from a ham asking me the very same question I
was thinking last week...what has happened to Olivia? Last year I
would say it was behind only PSK31, Pactor and RTTY in terms of
frequent actvity for digital modes. Now I think it is not as
size sent in MFSK data. The offset needs to be set for the
different Olivia widths, but that is about it. Am I confused?
Leigh/WA5ZNU
On Sat, 24 Feb 2007 2:02 pm, Jose A. Amador wrote:
MFSK has a pro and a con. It is HARD to tune, but it may transmit
small images
KV9U wrote:
SSB nets are not running digital modes and their frequency is the
dial frequency, whether USB or LSB. CW nets are based on the zero
beat frequency, but different rigs have different CW offsets. Many
rigs have the ability for the operator to change the CW pitch to
center the
KV9U wrote:
Assuming you are centered on 14109.5, there has been a Pactor 3 station
partically on that frequency. Tried calling you now since freq is clear
but no response. But not sure of QRG. I am dial frequency 14.108 _1500 Hz.
73,
Rick, KV9U
I found him on 14109.5 kHz dial QRG +
Miroslav Skoric (YT7MPB) wrote:
Hello to all,
I plan to make some test with JNOS or other derivatives and wonder what
versions of *NOS might be ok for my old 80286 PC AT (12 MHz CPU, 1MB
RAM, cca 10MB free space on HDD). That old comp I use now to telnet to
my Pentium box running
I have not used Moe's simulator yet. It takes my second PC that is not
working now.
Could you tell people like me which are those variables available on
Moe's simulator besides gaussian noise ?
So far I have only seen reports on gaussian noise using Moe's simulator.
And agreed. Working in
I am afraid that you can only reach a determination on SOME of the data
gathered with ionospheric data archives.
I think that Walt's proposal is a very good idea, but only part of it
will have verifiable path conditions. Nevertheless, you have to walk the
tunnel to get to see the light at the
Yes. Not only packet stuff, but Power Basic (meant for a 286) runs and
compiles well.
From time to time I use it for making some tools for some repetitive
and boring calculations.
So, don't think it is not possible...give it a try...you might be nicely
surprised. I am using XP Pro SP2.
Jose,
There is a standard used in instrumentation stuffsort of autovolt
on DC. Those devices work on anything from 10 to 30 volts, so it covers
at least
12.0, 13.8, 24 and 28 volts.
Those devices are NOT inexpensive, and maybe a manufacturer would think
a lot
to add some regulator inside the two
My father had a Hallicrafters HT-9 that did FMbut he never used it
on FM as long as
I remember. That line came to the market after WW II, if I remember well.
He sold his Hallicrafters transmitter in 1961 or so...Johnson HF
transmitters did not have
any measure of FM emissions.
Maybe some
There was some packet activity on 29 MHz in the 90's . While I could do
a LOT of forwarding at 1200 baud
on 28.18 MHz at 1200 baud using a SSB radio, I was NEVER lucky to get a
connection at 1200 baud FM AFSK,
even when I heard some of them. SNR was too bad.
The numbers tell that such a link
Isn't that a Softrock using SDR-1000 or M0KGK software?
Jose, CO2JA
Paul L Schmidt, K9PS wrote:
For a simple transmitter, how about a sound card mode that uses the
sound card in STEREO mode with I and Q components on L and R
channels, feeding two balanced modulators, and build a
Something I never have quite understood is that in the late 90's in
Indonesia, hams have used
1200 baud satellite PSK modems on 40 meters with seemingly good results.
It has been a bit hard for me to follow that. Does anyone have a
sensible explanation
for this to be useful. I do not own such
I have not followed the whole thread but I wouldn't be too sure to
believe that
Windows flaws exist per se and are not a result of agreements with somebody
else, as some conspiracy theories state.
Just in case, it is safer to use a third party firewall, or run a
bastillized *n?x.
Jose, CO2JA
If at all possible (or convenient) I would accept the operators to use
Windows. It is THEIR problem with virus and other vulnerabilities.
For the server, life would be much simpler using Linux. No antivirus
or Service Packs needed...
Jose, CO2JA
---
Leigh L Klotz, Jr. wrote:
If you use a
Would I consider YFW as a suffix for a new call ? Seems interesting...
Jose, CO2JA
Walt DuBose wrote:
I was pulling your leg...ALE is good for calling nets and having
individuals on standby and not bothering them until you have
something for them.
But I like calling CQ...
CQ CQ CQ
Patrick Lindecker wrote:
Hello Jose,
MFSK pictures are analog SSTV not digital SSTV.
Here are the MFSK SSTV specifications (from the Multipsk help)
73 Patrick
*SSTV in MFSK16*
Created by : Nick Fedoseev (UT2UZ) and Denis Nechitailov (UU9JDR) in
2003
_Description_ :
It is
KV9U wrote:
I did some more research and found out that according to the
Wikipedia (which I find to be the most incredible resource on the
internet for general encyclopedic information),
I can agree on that8-)
PSK (Phase Shift Keying) can be considered to be a subset of QAM
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
Brad wrote:
I have worked quite a few DX stations on both 7035 and 7070.
I see more long DX's on 7035more USA stations on 7070.
I see no Pacific area stations in any of those windows. I have
worked Europe Africa and the Middle East on 7035.
Jose, CO2JA
Jose, there isn't as
Brad wrote:
The above is news to me. I rarely hear any digital signals on 40M
much
below 7.065. The bulk of keyboard digital activity seems to take
place
from about 7.069-7.075 or so. If there is a trend towards digital
qsos
down around 7020-7040 it is not discernible. de Roger
Brad wrote:
I would query why the DX goes that low for PSK, as if they dont
know about the US sub bands. If they dont call in the sub-bands we
can use,
then they are not going to work us DX. (speaking for the other classes of
course).
I am in North America, CQ zone 8...and it is very
Lossless compression does not work if there is no redundancy.
The Quick Brown Fox has one of each symbol on the alphabet.
Jose, CO2JA
Rein Couperus wrote:
-Ursprüngliche Nachricht- Von: digitalradio@yahoogroups.com
Gesendet: 13.01.07 02:36:52 An: digitalradio@yahoogroups.com
I have worked quite a few DX stations on both 7035 and 7070.
I see more long DX's on 7035more USA stations on 7070.
I see no Pacific area stations in any of those windows. I have worked
Europe
Africa and the Middle East on 7035.
Jose, CO2JA
Alan Tindal wrote:
Well Bonnie I don't know
It seems I should state the part of the history I have lived.
1n 1991 I started with my C-64 and KPC-2 as user of several HF BBS's, on
different frequencies, surfing the NETROM nodes, etc, until I
settled as user of YV2AEH on 14095 LSB. It solved a problem I had
not been told : stable mail
KV9U wrote:
E-mail is tremendously more useful than the hierarchical packet
system because it works not just for hams, but for anyone with
e-mail, which is ubiquitous in countries such as the U.S.
What I wish for is a system that could do both.
Most xNOS can do it. Say, GRINOS, TNOS,
I am afraid it is as Rein says.
FBB, which uses B1F compression (hope I remember right) does not
compress the sysop keyboard, but just the BBS traffic.
JNOS has a compressed ttylink mode that uses LZW and has never worked
for me (compile errors), but which might provide an edge.
PTC-II boxes
Not bad...but quite a few DXpeditions and less luck people cannot rely
on full time Internet.
This is ham radio...
Jose CO2JA
Dave Bernstein wrote:
Why stop there, Leigh? With the use of QRZ.com and weather.com to
independently determine name, QTH, and weather conditions, you could
That's fairly simple. It just takes to make a static build.
Inconveniences: It generates much larger code.
Nevertheless, may be an option. If the codesmith would care for
releasing both static and dynamic linked programs, there would be a
solution for all.
That's what Mozilla does, as sake of
DuBose Walt Civ AETC CONS/LGCA wrote:
SVCHOST (svchost.exe) IS a dog and CAN eat up performance on such a
short term/time basis that it will never show up in your task manager
and perhaps not even as a spike on you CPU performance.
The other possibility is that something is running in
Robert Chudek - KØRC wrote:
Jose,
Here's a full technical description about this executable and its
tasks: http://support.microsoft.com/kb/314056
http://support.microsoft.com/kb/314056
73 de Bob - KØRC in MN
Thank you Bob. I followed the URL and now I see
73, Jose
A friend of mine built one of those XR2211 demodulators...it did not
work very well on the real HF world. He left it aside and Hamcom with
just a 741 squarer performed better than that.
I built something inspired on the AN-93, but not a copywonderful !
It had two active filters, full wave
Well, without measuring anything on a path simulator, P III works very
well.
Uses most of the good tricks on P II, like convolutional encoding (sort
of FEC)
Viterbi (maximum likelyhoodi.e. minimum repeats) decoding, and some
clever
speed change strategies.
P III improves in modulation,
?
~Ken - VK4AKP .-.-.
--- In [EMAIL PROTECTED] mailto:Q15X25%40yahoogroups.com, kd4e
[EMAIL PROTECTED] wrote:
Jose A. Amador wrote: Could I suggest that PAX/PAX2 be considered
as candidate modems formats?
There is no point to either -- they are costly proprietary formats
-- contrary
It depends on the location and the wires around. Your power lines might
get loaded with RF, and conduct part of the radiated RF back into the
shack. A power line filter and a good ground may take care of it. You
don't want to fight the RF current, just attenuate it enough, so an L
input
Trere is a page with a good collection of Softrock stuff, including some
info about a Softrock transceiver
http://dj9cs.raisdorf.net/SDR-SoftRock.html
Jose, CO2JA
KD5NWA wrote:
Andrew O'Brien wrote:
Biggest disappointments of the year : 1. ALE . Has just not taken
off in the amateur
Michael Hatzakis, Jr MD wrote:
I’ve got a couple of TNC’s and radio’s in my car that I like to
operate with backup battery after the car’s ignition goes off. I use
a charging circuit to keep the battery charged when the car is
running.
This is my problem: when I start the engine, the
Andy,
NVIS simplified means a very high angle antenna and operating below the
critical frequency.
At mid latitudes it may mean 80 meters and lower frequencies. At my
latitude (23 N) sometimes
40 meters qualifies.
Of course, tricks may be done to enhance skywards radiation, like using
wires
John Bradley wrote:
Couple of observations;
*Had to change the Dwait values and TXdelay values to 80 , (found under
options)increasing the delay slightly seemed to work better, although
some of that could be due to desensing the rigs a bit, being so close.
It also could be that the
Certainly ! And I speak for myselfthe easy move is to use shift lock...
the clever move is to increase the font size...
Thanks for the reminder, Simon.
Jose, CO2JA
---
Jerry W wrote:
Simon,
Because most are seniors and have poor eye site, HI.
Jerry - K0HZI
--- In
Here I feel much safer if I use a transistor to key the PTTdriven by
light.
I use an optocoupler to key the PTT. It has stood thunder, which is real
serious
in June, without damage to the rest of the connected stuff. I don't use
rig control.
The simple transistor interface for CAT blew
would have to cover new modes as they
are developed -- as do the applications that decode and encode them.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com
mailto:digitalradio%40yahoogroups.com, Jose A. Amador
[EMAIL PROTECTED] wrote:
David Michael Gaytko // WD4KPD wrote
It has not been easy for me using the same interface for other sound
card modes.
With two cards, I used my best card (an Audigy 2) to receive,
and the AC-97 to transmit.
It is a bit tricky to separate everything the way it shall be set up,
but seemingly my setup worked.
Only I could not
KV9U wrote:
We need to continue to advance our technological abilities and narrow
modes do this best. We already have the modes that operate about as
fast as they can for a given bandwidth and robustness. What we don't
have are modes that can adaptively change with the conditions
jhaynesatalumni wrote:
I just tried running multipsk under wine. After not finding the
volume control it put up a box that says something like it is trying
to access through 00 and then puts a mess on the screen.
What incantation are you using to get it to work?
No, did not
Roger J. Buffington wrote:
No matter what group I join, this Windows v. Linux topic comes up.
If we are not supposed to keep talking about the new FCC digital regs
(something of vital interest to most of us digital ops) then we
should be able to dispense with this Linux topic, which has
Dave wrote:
I'm feeding audio from my IC-746 (non-Pro) to the PC from the ACC-1
jack so I can have constant audio level. I feed audio from the
external speaker jack to an external speaker (novel concept!). The
problem I'm encountering is that I share the shack with the XYL, who
is only
I would rather use zip, rar or gzip. Maybe, bz2 for an extra squeeze.
.doc format is VERY redundant and has a minimum size around 20 K,
even if you type a pair of characters.
Possibly .odt is a good move. Even then, I would compress it.
Even using plain text, compression and uuencoding did
DuBose Walt Civ AETC CONS/LGCA wrote:
Jose,
This is what I have been saying for a couple of years now.
Se we are not alone.
Research done by independent research laboratories and universities
confirm that the best bet to increase throughput and robustness on HF
channel modems is to
Leigh L Klotz, Jr. wrote:
Instead of switching Why not get a second computer and try it? You
can use a cheap IOGear video switch, or use VNC and operate it from
your Windows box (or vice versa). An 800MHz P3 or up ought to give
you a pleasant enough experience. I used to recommend
KV9U wrote:
I am at that point that I could switch, even if I have to give up
some of the software that I prefer, since I have retired and do not
absolutely have to have certain Windows only software that I used to
require in my business.
Years ago I had a Linux dual boot and managed
Rick,
To me it all depends on the channel behavior. On HF, with multipath,
the parallel modem wins because the simbols can be made longer than
the delay spread.
Just observing the succesful implementations may lead anyone to see that
in an ionospheric channel, generally, parallel tone modems
Andrew O'Brien wrote:
I found this quote today, anyone care to comment ?
Although it is a common belief to the contrary, it is in fact quite
alright to let the transmitter ALC line operate on PSK31. The ALC
line will control the drive level without clipping in the same way
that it
Mark Miller wrote:
The wider bandwidth of PIII may make the transmission more robust.
Not only so, mainly it is the effect of constellations that have been
chosen.
Pactor II uses DBPSK, DQPSK, 8DPSK, or 16DPSK over two tones.
Pactor III uses DBPSK or DQPSK over up to 18 carriers separated
Could I suggest that PAX/PAX2 be considered as candidate modems formats?
Those are very robust modem formats, far better than the traditional
Bell 103 modems
for HF, and might prove to be better than Q15X25 in poor conditions,
specially on the
lower bands. Q15X25 is faster, but requires a
Tony wrote:
Ed wrote:
Are there any communications engineers in this group that can give
us some idea whether a useable quality digitized voice can be sent
over a 2.5 KHz wide HF channel with SNR comparable to or less
than what is required for analog voice?
I was thinking about
kd4e wrote:
I am puzzled as to why one digital signal works well under poor
signal conditions and another does not.
You have to define poor conditions somehow.
It may be noise, multipath, ionospheric doppler, fading, etc. Each one
produces a different impairment, depending on the modulation
KV9U wrote:
Interesting comments. It always seems that there is nothing new that
is totally perfect compared to existing equipment due to the
tradeoffs that often occur.
Tradeoffs are a central part of engineering.
The SDR-1000 does look really interesting
as a general purpose receiver
jgorman01 wrote:
I have done the same thing to calibrate my vfo's. But remember, when
you are right on frequency, there is nothing to indicate that there
is another signal there. And, I'll be honest, I've never seen my
s-meter add the two signals together which would indicate that the
kd4e wrote:
(text snipped)
As you noted, if we boost the power level of the transmission we
enhance the probability of overcoming the BPL QRM/QRN, but we do so
at the price of increased cost and added energy -- which may be a
precious commodity in an emergency deployment. We also risk
jgorman01 wrote:
Bonnie,
Your remarks about this person, and I don't know who it is, are not
very convincing. Your award winning design apparently had to do with
co-channel interference. This is not the same as on-channel
interference that increases the total noise level, which is what
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