El 18/03/2010 18:11, KH6TY escribió:
Extensive tests on 70cm using ROS 16 baud spread spectrum have been
disappointing. ROS appears to be unable to survive the Doppler shift
and Doppler induced "flutter" so prevalent on that band. The hope was
that ROS 16 baud would make traditional communic
El 10/03/2010 10:51, KH6TY escribió:
Jose,
If you were going to design a mode that filled 2200 Hz, but did not
use SS, and was as sensitive as possible in that bandwidth, how would
you do it?
Tough question. I believe that on HF the best solution so far is Pactor-III
It would have to be h
El 10/03/2010 7:57, g4ilo escribió:
> What does ROS gain by using SS over another mode that carries the same amount
> of data at the same speed using the same bandwidth and the same number of
> tones but uses an entirely predictable method of modulation?
Processing gain. Signals correlated with
El 09/03/2010 21:15, rein...@ix.netcom.com escribió:
> Sorry Ralph,
>
> I did not read the header.
>
>
> &3 Rein W6SZ
>
> -Original Message-
>
>> From: Ralph Mowery
>> Sent: Mar 10, 2010 12:25 AM
>> To: digitalradio@yahoogroups.com
>> Subject: Re: [digitalradio] Re: Question for exp
El 09/03/2010 17:11, rein...@ix.netcom.com escribió:
> Hello Jose,
>
>
> Multiple Frequency Shift Keying, OK, but you really
> did not answer my question, I think.
>
> Suppose I replaced the modulation device with a filtered
> piano ( no harmonics ) a microphone.
> I am serious, trying to find out
El 06/03/2010 19:44, iv3nwv escribió:
> Jose,
> if you are referring to me I'm not saying that theoretically it is correct to
> use as much bandwidth as possible. This is a conclusion you have drawn on
> your own.
>
> Using a 100 kHz bandwith to communicate information at a rate of 1 bit/s
> cou
El 06/03/2010 14:53, Rein A escribió:
>
> Hello Jose,
>
> I always set the sound card volume, the modulation, that when changing the
> volume setting, the output of the transmitter will follow in a linear fashion.
> This is very important in particular for WSPR and WSPR-QSO modes.
>
> 73 Rein W6S
SJT capabilities, it seems.
>
> 73 Rein W6SZ
>
>
>
>
>
> -Original Message-
>
>> From: "Jose A. Amador"
>> Sent: Mar 6, 2010 8:54 AM
>> To: digitalradio@yahoogroups.com
>> Subject: Re: [digitalradio] JT65A harmonics
>>
>> El 06/
El 06/03/2010 11:28, g4ilo escribió:
> I was listening down around 14.077, just above some slow FSK mode which I
> think is JT65A. The JT65A was tuned quite low pitched in my receiver, and I
> could clearly see "images" of it over to the right. Judging by the spacing of
> the "image" tones I was
El 06/03/2010 9:01, KH6TY escribió:
The other possible problem is "wide-spreading" spread spectrum. There
was a failed attempt about 5 years ago by the ARRL HSMM (High Speed
Multi-Media) proponents to allow spread spectrum on the HF bands with
the argument that the signal is spread so widely, e
El 06/03/2010 8:14, theophilusofgenoa escribió:
> I had the idea that a reason spread spectrum was not legal was that the use
> of a psuedo-random spreading sequence lent itself to the development of an
> unbreakable code (or at least a difficult to break code) that would allow
> secret communic
El 06/03/2010 10:03, Dave AA6YQ escribió:
>>>I don’t have a definition, Rein; I agree with you that the Wikipedia
entry is not authoritative. The fact that part 97 references spread
spectrum without defining it is one of the root causes of this
controversy, leaving us to make “individual deci
On Sat, Mar 6, 2010 at 9:12 AM, Arnaldo Coro wrote:
>> So, amigos at "digital radio ", my advise , and that's what I am going to
>> do, is to
>> alert ROS users of the possibility that the author of the software may even
>> be
>> attempting to use it for other purposes that are not related to a
El 06/03/2010 8:34, Andy obrien escribió:
> I was helping a ham get set-up for digital modes recently and turned
> to the issue of interfaces for digital modes. I researched the price
> for a Rigblaster Pro and was shocked that they sell for $299. My
> friend settled for another interface that c
I agree with Nino, theoretically it is correct to use as much bandwidth
as possible, 3 kHz in the ROS case, but due to the small spreading, the
ROS signal does not have a "negligble level" compared to others on the
channel, so it is a halfbreed, it has spread spectrum characteristics,
but does
El 06/03/2010 4:49, rein...@ix.netcom.com escribió:
> I thought, that there has to be a direct specific connection
> between the transmitter and the receiver on how to retrieve
> the "info" from the spread spectrum. ( SS for dummies )
>
> This makes it useful for the militairy, for who it was
> ori
o, that is no secret, he has no callsign.
73,
Jose A. Amador, CO2JA
---
Date: Wed, 24 Feb 2010 09:59:50 + (GMT)
From: jose alberto nieto ros
Subject: Re: [digitalradio] Re: Consensus? Is ROS Legal in US?`
To: "Jose A. Amador"
In-Reply-To: <4b848deb.9080...@electrica.cujae.ed
No, I have not, because Olivia is usually found in different frequencies
than those where packet activity is found on this side of planet Earth,
and in general, packet sysops and Olivia users know their way around and
do not step over others toes. Very seldom I have experienced Olivia to
Oliv
I used:
System Info for Windows v1.67 (Build 626) --- March 17, 2007
Freeware Version -- Copyright © 2004-2007 Gabriel Topala
to determine which is the device number. In my case, receive card
(Audigy 2) is device 9 and transmit card (AC-97) is card 1.
In my case, setting 0 in my configuration
Nothing is altered. In a SSB transmitter, amplitudes are scaled (usually
UP) and frequencies just shifted. So, if audio tones change frequency,
RF tones do likewise.
73,
Jose, CO2JA
---
El 22/02/2010 18:04, John escribió:
> So as to not continue growing the ROS legality discussion even furth
ROS is one voice channel wide, it seems to have been conceived for a 3
kHz wide voice channel, as usual with SSB radios.
Its width is comparable with accepted modes like MT63 or Olivia xx:2000.
It is not an automated mode, it is meant for keyboarding.
Its spectrum spreading is hardly the way Wi
James French escribió:
> On Tuesday 02 February 2010 13:05:23 sszretter wrote:
>
>> Can someone tell me if this makes sense --
>>
>> I had a RS 2m HT with a KPC-3 and was able to reasonably connect to 3
>> different stations.
>>
>> I switched out the radio and put in a Kenwood TR 2600 HT.
>>
>
I installed both the Puppy and Knoppix versions and did very well from
hard disk, as far as you can go with a Live CD.
Particularly, Knoppix worked very well with Wine and Windows software.
It was a nice experience.
73,
Jose, CO2JA
--
Rein Couperus escribió:
> Russell,
>
> As soon as fldigi
I also agree. Please count my vote for Patrick.
Jose, CO2JA
---
Warren Moxley escribió:
>
> Patrick is the greatest! I 2nd that nomination.
>
> --- On *Sun, 12/6/09, Ian Wade G3NRW //* wrote:
>
> From: Ian Wade G3NRW Subject: Re: [digitalradio]
> Nominations for 2009 Digitalradio Awards ne
Look for "The Hardware Book", by Joakim Ögren in
http://www.hardwarebook.net/. It is a manual for many connectors, cables
and buses,
including PC's and home audio and video.
And yes, there is a standard, the tip is the left channel.
73,
José, CO2JA
---
Chris Robinson escribió:
Tip is
On 14105, VE1AMA is using some version of TNOS. There are many
Kantronics TNC's on that network.
JNOS also has a KISS interface. But JNOS required some non trivial
effort by the unninitiated to set up when I began using it.
Sadly, FBB (the best BBS for my preferences) has DED interface on the
I have not used MixW in a long time and my memories might be a bit
innacurate, but in MixW you set the basic modulation and choose the
arguments in a
cascading menu. Say, you choose RTTY, and in the modem configuration you
choose shift and speed. On PSK you may choose the signalling speed, and
I called and beaconed using v. 0.536 on 7077.0 KHz USB and nothing happened.
Jose, CO2JA
obrienaj escribió:
> I will be operating RFSM-8000 tonight around to 0200 probably around
> 7077 or 14077 depending on conditions. I will beacon occasionally and try to
> remember the baud rate limit
I do that a lot, particularly when I put that screen on the background
to do something else on the computer.
Very useful !!
Jose, CO2JA
---
Andrew O'Brien escribió:
> Just a reminder, with Multipsk and in JT65 modes, try clicking on the
> VOCALIZATION button. With that pressed (and your speak
Marco,
I usually run MultiPSK 4.14 for JT65, so, just press the proper button
(JT65), select JT65A, left click on the sync tone (the extreme left
limit of the signal on the waterfall). Besides, your computer must be
synchronized to UTC somehow (from the Internet, a GPS, or a radio
standard li
Warren Moxley escribió:
> I don't think he knew it was not ready for prime time since
> he has a real Pactor III TNC. It still looks to me that your are
> pretty much stuck without this piece of hardware if you really need
> to do WinLink via HF. It looks to me that WinLink is great for guys
>
Dave,
Is the beacon interval OK?
Wouldn't it better be 30 MINUTES?
I wonder, because I used to run beacons every 10 minutes on packet.
Less than that could be considered "antisocial" by some people... :-(
73,
Jose, CO2JA
---
David Freese escribió:
> for example: MT63-500 requires flarq be s
Just one more comment, being on agreement with the previous postings...
on a "linear transponder" (as a SSB transceiver becomes usually on HF
between your antenna and your soundcard) just rock the transceiver's
dial to make the tones fall in the proper place in the spectrum.
FLdigi has a swe
The difference here is that a "helper signal" has been added, same as
with SSTV, but which is only sent at the start of the
transmission.
That is essentially different from the raw, bare signal with no ID. A
new situation, to be fair.
73,
Jose, CO2JA
Simon (HB9DRV) escribió:
>
>
> FWIW SSTV
frankk2ncc escribió:
> I don't understand nearly what it would take to do this, but what a clever
> thought! Would it work on something already compressed, like a JPEG via SSTV
> without further loss?
>
>
> f, k2ncc
>
>
>
> --- In digitalradio@yahoogroups.com, "Simon \(HB9DRV\)"
> wrote:
>
aa777888athotmaildotcom escribió:
> --- In digitalradio@yahoogroups.com, "Simon \(HB9DRV\)"
> wrote:
>
>> Thinking to myself - when we use a mode such as Olivia / MT63 with extensive
>> error correction, why don't we compress the text?
>>
>> Given that fldigi has the wrap feature then surely
It all shows a severe electromagnetic incompatibility in your "shack".
Check if all goes OK with dummy load, both at the HF radio and at the
tuner output.
If all goes OK with a dummy load, then you may have RF feedback (bad)
into your power line, that feeds all the "faulty" equipment.
It is q
It seems that the wheel has to be rediscovered periodically. For me, the
solution is to use a PEP wattmeter and always run the output power
slightly below the clipping level, where the meter needle advances no
more. This point may be different on different bands. Just identify the
clipping level
For many reasons I built my own and I feel it is foolish not to use an
optocoupler when you already use two transformers.
I am not happy with less than that. I use soundcard input and output
with stereo miniplugs and serial port keying with a DB9
female connector. I use another female DB9 for au
Isn't hand sent Morse Code a jittery PAM / PWM combo?
A computer can generate a less jittery code.
But machine reception is something else. PAM is the simplest, but the
worst to decode reliably digital modulation in the presence of noise and
interference, which are the rule at least on HF.
I wonder what kind of "investment" is required.
It has as many points as possible in common with sound card modes and
only requires MultiPSK as terminal program.
If I am not asking for a comparison between apples and oranges (I am not
entirely convinced right now... 8-) ), maybe Tony could devi
Not necessarily so if the disk is damaged.
gkar2000 wrote:
> The easiest thing might be to borrow a USB floppy drive and install
> it from there.
>
> Mike kc9doa --- In digitalradio@yahoogroups.com, "Casey Bell"
> wrote:
>> I have a registered copy of PACTERM 98, I'm not trying to 'bootleg'
>>
To send a smiling face 8-) , you just send a number eight, followed by a
dash and a closing parenthesis sign.
The roots are in the newsgroups mails, more than 15 years ago, before
anyone had the idea to translate the literal signs (emoticons) into
yellow smiling faces and such (seems those cam
Exactly. With the prevailing bad propagation (and maybe the increased
noise levels around my QTH) it is rare lately that P III can go into
"fourth gear" or higher...
And I did not have good luck with Q15X25. It was more tha five years
ago, and I blamed my old computer...
73,
Jose, CO2JA
Ric
I would advise you to check http://www.antennex.com for some past
articles about the TakTenna.
73,
Jose, CO2JA
---
Larry Kebel wrote:
> I was reading up on the TAK-Tenna and found that it might just be the
> antenna I am looking for. Check out www.Tak-Tenna.com
>
> But, all the info I get i
deadgoose38 wrote:
> Hear a digital signal -- maybe 8+ tones. Starts with a low one, then
> shifts to series of single ones at a higher frequency, then returns
> to the "base tone." What am I listening to?
JT65
> Will DM780 decode it?
No, that I know.
> If not, what?
WSJT, MultiPSK
73,
Per wrote:
> Hi,
>
> I know, I've not always kept my mouth shut either but it never leads to
> any good in the end.
> As we are hams we should have an antenna flame war instead ;-) (I like
> verticals ;-))
>
> 73 de Per, sm0rwo
Agreed 8-)
73,
Jose, CO2JA
Linux User # 91155
http://counte
Not exactly. You must add the upper and lower keying sidebands spacing
to the upper and lower tones to get an aproximate idea of the occupied
bandwidth. The sidebands lie at half the signalling speed around the
carriers, and the keying harmonics, whose level and width depends on the
modulation
Some members of another group I am a member too felt harrassed and sent
a protest. Sometimes we got too many announcements and no real news, so
it became tiresome. Most mails were pdf's with large detailed images,
which was quite a burden for slow modems.
73,
Jose, CO2JA
---
Andrew O'Brien
That's not me !
I wanted to stress the point that we have two seemingly different needs:
one for keyboarding, which is OK with a smaller character set, and a
full 8 bit word mode for data, that could be used instead of the old
packet modems. As usual, each one might carry a different name or
d
Norbert,
I am taking the license of answering before Tony does, so look for the
Pathsim docs (AE4JY). There is another german program, IONOS, which is
another HF path simulator.
I have just played with them, but actually done nothing serious enough.
73,
Jose, CO2JA
---
Norbert Pieper wrote:
m3hxe wrote:
> Hi may I bother you with some questions.I would like to try psk31 and
> plan to buy a kit interface soon. My problem is this,I am restricted
> to 10 watts output due to licence conditions and use a Trio ts-130s.
> I use an alc mod to reduce the power output to 10 watts by applying
Mark Milburn wrote:
> if you want to dig in a little deeper, you may need to download and
> install a program that decodes compressed packets.
>
> If I can be helpful, let me know how.
>
> 73 Mark KQ0I Des Moines, IA
Mark,
Do you know any program that does that, on the fly and on the air?
I
W6IDS wrote:
> The only other issue I did have was a lack of backward compatibility
> with PK-232 software, XPwin, that I used on an older XP computer
> before it crashed three months ago, or so.
I found a program that helped with XP and some DOS programs, but I don't
know if it would work OK in
Alan Barrow wrote:
> Yes, I understand "it works". FBB works OK on HF because once you are
> logged in, it's not that interactive. But you still have 2-3 turnarounds
> before you send the initial message, etc.
FBB protocol has a feature I find very valuable: the Z-modem style
resume. JNOS had no
Based on what I know, for SMTP, JNOS may be an option at less than 300
baud, i.e., 100-110 baud or PAX, using MultiPSK as "soundcard modem".
I have not tested any of it yet. I have had no time and possibilities to
test it so far.
JNOS can use FBB compression or LZW compressed SMTP on any of it
I almost always used JNOS with KISS interfaces, it is a natural way of
using it. TNC's under MSDOS, and also thru pipes under Linux with
net2kiss (I would have to go back to the manual to remember a few
details). It could be interfaced with the BPQ switch, so FBB, JNOS, the
BPQ switch could sh
kf4hou wrote:
> This is only a theory , but i like to have some input on this.
>
> I have noticed on using bpsk31 some stations can be very wide at
> times. I can give them a report they are wide and they also tell me I
> am wide. but the next day they look clean to me and they have not
> touc
Maybe one of the latest versions of Hamcom, or Mix 2.19 or 2.21 could be
configured to make your boxes run with a PC and PC software.
I did some 12 years ago, using a KPC 2 as dumb modem and homebrew FSK
modems (TU's) on my old 386 and 486's using the serial and parallel
ports. Don't ask me ab
Seemingly you are experiencing clipping/distortion/overload from a too
high audio input, judging the fact that you are getting strong harmonics
in the passband.
73 & HNY,
Jose, CO2JA
---
n4hra wrote:
> I am having a problem with a new Signalink USB depending on how strong
> a station is I g
Jose A. Amador wrote:
> Pactor 3 MUST be USB.
To remain compatible. If EVERYBODY used LSB, there would not be any
problems, of course. Just a thought after I reread this from the list...
Jose, CO2JA
VI Conferencia Internacional de Energía Renovable, Ahorro de Energía y
Educación Energétic
Due to its baseband coding, it does not matter what sideband you use in
packet. It is only relevant to published dial frequencies when tuning
some spectrum chunk. I did use USB for many years with the only
consequence that dial frequencies were different. Same happens with
Pactor or Pactor II.
I use USB for RTTY, and reverse in the terminal program.
That keeps mark and space in the right relative places.
73,
Jose, CO2JA
John Becker, WØJAB wrote:
> At 02:23 PM 12/30/2008, JONATHAN WALLEN wrote in part:
>> All data modes should be in USB.
>
> True except for RTTY.
VI Conferencia I
Andrew O'Brien wrote:
> Please excuse the non-radio question...
>
> We have a PC that just stopped working, looking for some possible
> ideas. The PC (a desk top) was knocked over by a frustrated teenager
> , when plugged back in the power light comes back on but nothing is
> seen by the monitor
o
> one else was able to come up with an adaptive mode suitable for amateur
> use, so this could be the next big thing ...
>
> 73,
>
> Rick, KV9U
>
>
> Jose A. Amador wrote:
>> I can understand that procedure in sake of simplicity, but hardly an
>> efficient
Rick W wrote:
> SCAMP had no problem at all with the switching times from the testing
> I did. As a former Amtor and Pactor user from years earlier, it
> proved to me that my concerns about switching were unwarranted.
Cold switching (no RF until contacts are closed, or opened while RF is
flowing
Thank you, Toby. Yes, that can be an option.
73,
Jose, CO2JA
---
Toby Burnett wrote:
>
>
> I've used winpack and AGWPE sound card driver with success before on
> my local BBS nodes. Not sure if this is what your after.
> Works quite well. Now unfortunately I'm not in range of my nearest
I would like to receive suggestions about what may be available for
G3RUH encoded 9600 baud packet, using Windows XP and Linux.
I would like to try the digital amateur satellites sometime and I have
no 9600 baud TNC available.
In general, I would appreciate pointers for sound card packet softwa
Quite possibly!
But at this date, with the Summer Solstice so close, who is going to
blame him? I see nothing wrong in having a few COOOLD beers while
tanning on the beach ... 8-)
Hector, muchas cosas buenas para tí y los tuyos,
73,
Jose, CO2JA
---
John Gleichweit wrote:
> Feliz Navidad y
if
there are others interested in doing their own tests and publishing the
results.
73,
Jose, CO2JA
-
Tooner wrote:
> --- In digitalradio@yahoogroups.com, "Jose A. Amador" <[EMAIL PROTECTED]>
> wrote:
>> That's OK for aural reference, but a .wav cilp is required
It might be a switching PSU on standby mode. I know one TV set that
cycles in a similar way (producing some 'reverse TVI"), even when the
numbers are not the same, it starts, charges the main capacitor, goes
into standby and restarts when its voltage diminishes under a certain
threshold.
73,
That's OK for aural reference, but a .wav cilp is required for decoding.
MP3 discards some aurally masked info and does not retain an accurate
phase record.
73,
Jose, CO2JA
Tooner wrote:
> Here's a mode I hear often. Anyone know what it is and maybe what the
> typical decoding settings are? (
Might be coming from Europe. I was hearing an EI station stirring up a
pileup one kHz up.
The EI station was keeping this signal out of his USB passband, so I
assume it was a QRM source for him ... 8-)
So, this signal coming from beyond the skip zone in EI.
73,
Jose, CO2JA
---
Andrew O'Bri
I am copying it some 20 dB out of the noise here in Havana at 21:55 UTC
on 14173 center.
It has 8 threads, plus some other two that show up on the side, at much
lower intensity, possibly IMD products, as their amplitude seems to
track the larger peaks excursions. The tones are 875, 900, 925, 9
Tony wrote:
> Patrick,
>
> I get the same minimum SNR for Contestia but can squeeze -8db out of
> MT63 when using DM780 and IZ8BLY.
Yesterday I had no luck with DM780 while monitoring Tony's QSO's on
14106. Of course, I have not calibrated DM780, so that is no surprise.
Propagation was not g
oups.com
> *Subject:* [digitalradio] Re: ASCII ?
>
>
>
> --- In digitalradio@yahoogroups.com
> <mailto:digitalradio%40yahoogroups.com>, "Jose A. Amador" <[EMAIL PROTECTED]>
> wrote:
>
> > but there was a GM - Microsoft
> > controversy tha
It may have been that you were awake while "Snow White" slept...
73,
Jose, CO2JA
--
Andrew O'Brien wrote:
>
> Is my brain dead? I may be missing the point of this product, I read
> the manual and it says "PSK31 is a new mode" and it references 20 year
> old concepts . Seems like a step back
John Becker, WØJAB wrote:
> Still a lot of machines out there still working after all these years.
>
> Gee it would be so nice if the software writers would do the same.
>
> John, W0JAB
John,
It is the ongoing fashion, nothing else. Life cycles are shorter
nowadays. There are many old americ
jhaynesatalumni wrote:
> I guess some people thought it was a Big Deal, but there were lots
> of reasons why it didn't go anywhere.
>
> I'd say the overriding one is that with 60 wpm Baudot RTTY the bit
> length is 22 milliseconds. With 100 wpm ASCII 110 baud the bit
> length is 9 milliseconds.
[EMAIL PROTECTED] wrote:
> I have a KAM XL and a fully tricked out PK232.
>
> can either of them be licensed for Pactor III?
>
> what is the cost of upgrading to II and to III?
>
> thanks
> chas k5dam
No, it is only for the SCS made boxes. For license details, check
http://www.scs-ptc.com
7
Patrick Lindecker wrote:
> Hello to all,
>
> The KISS feature is available in a test version. A next new test version
> (proposed in the Multipsk reflector) will improve this feature tested
> through UI-VIEW for instance. There won't be any licence necessary for this
> feature, so it will be op
Rick W wrote:
> I don't know enough about ionospheric disturbances to know if you can
> only have Doppler (such as polar flutter) without having multipath at
> the same time.
The only way that comes to my mind that you can get rid of multipath is
by just receiving a single ray. To achieve it,
Off list. Don't want to spill gasoline on the fire.
Does your Signalink use a COM port at all?
My interface is homebrew, and uses one COM port to derive PTT from.
Packet is tolerant of losing part of the flag bits, maybe pactor too,
but AMTOR does not tolerate delays at all. It has been years
Seems we are reaching the age of the "crippled PC". For a desktop there
should still be a chance of adding a serial port PCI card. I have never
used the parport for PTT so far, and it seems I never will...
USB is adequate for most common PC jobs, but not for interfacing radios
without some _sp
SNR in a 3 kHz BW has become a gauging standard. Even when a PSK decoder
may see a PSK31 signal some 16 dB better on a 63 Hz bandwidth.
Even when the actual signal is much narrower and the decoder uses a
matching bandwidth, which allows a better SNR to the demodulator, it is
useful to have a s
Also, in the case of PSK / QAM, the simplest constellations may stand
much more abuse. If you also have different levels (8QAM and more
complex) clipping/limiting affects the Hamming distance and may confuse
symbols.
Once again, KISS may be the best way... 8-)
73,
Jose, CO2JA
---
Patrick
Did you try to select any options for the recording control?
Select "what is heard" (or something alike, mine is not in english).
"Analog mixer" selection on my Audigy 2 mutes monitoring.
Jose, CO2JA
--
Rick Westerfield wrote:
> Hello All,
>
> I have found this before and it is working on m
As I understood in a quick reading, this is aiming at keeping the modem
and adding intelligent redundancy, specially for beacons and telemetry.
The older equipment just receives some more "harmless digital rubbish",
and could even receive the same packets with no improvements.
Interesting, any
WD8ARZ wrote:
> Get good at using what we got the way it currently works, or it is all a big
> waste. Many are dedicated to making what we have work, work better, and
> evolve over time.
>
> 73 from Bill - WD8ARZ
> http://hflink.net/qso/
Whatever the protocol and network, I still see the need
Rud Merriam wrote:
> I suggest anyone interested in this topic start by reading
> http://citeseer.ist.psu.edu/cache/papers/cs/2504/http:zSzzSzpeople.qualcomm.
> com/karnz/papers/newlinkpaper.pdf/karn94toward.pdf by Phil Karn
> KA9Q. If anyone does not recognize his name or call then research him
Paul L Schmidt, K9PS wrote:
> I've got to agree with Jose here. AX.25 works pretty well on VHF,
> but falls apart on HF. But AX.25 is a link-layer protocol, not the
> whole suite of stuff that got crammed into a TNC. AX.25 may have
> been derived from the X.25 landline protocol, but using th
> broken arm last spring side tracked me, along with summer family visit
> commitments.
>
>
> Rud Merriam K5RUD
> ARES AEC Montgomery County, TX
> http://TheHamNetwork.net
>
>
> -----Original Message-
> From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] O
Graham wrote:
> I really do not understand Graham's proposal: a narrow band spread
> spectrum system? I really need some more clarification about this.***
>
> Ok may be a bit like calling a steam train a iron horse, dose the
> same thing but a little differently
>
> Spread spectrum : ma
FEC may be applied by the modem, a layer 1 device. Layer one actually
encompasses many sublayers, as are channel coding, modulation and radio
channel frequency.
AX.25 does not specify the modem. That is a pretty common confusion (I
also suffered it as a beginner), because it may not be too int
There are multiple examples of reconfigurable devices that might prove
viable and not too costly. I am certainly not advocating against sound
card modes, or for high cost hardware. For me, hardware might prove
harder to get than software, but I just won't allow that fact to blind me.
Don't lo
I have been playing with what has been available around, and the past
august, I devoted quite a bit of time to receive DRM. It is not easy,
in spite of the high powers the broadcasters use, and the more succesful
ones are the less greedy ones. I had far better results with RNZI and
its 17 kbp
; If there was anything actually better out there, the HF digital
> network would already be using it and AX25 Packet would only be found
> on the VHF/UHF bands.
>
> But there isn't, so...
>
> 73 DE Charles Brabham, N5PVL
>
> [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
I believe that both the AX.25 and the BBS model are OK, but that the
packet channel coding is a disaster in the sense that a single erroneous
bit trashes a frame. That fires up the retries chain that are so
detrimental to the link capacity, and may sever it as well.
Pactor does a _LOT_ better,
Andrew O'Brien wrote:
> Please excuse the non-ham question but hopefully folks here will have
> an idea or two.
>
>
> One of my household PCs (not the ham PC thankfully) was dropped
> during a move to another room. Out spilled the memory cards,
> wireless PCI card, and the CPU heatsink fan.
If I am allowed to summarize, if you don't own a PTC, at least give
Olivia a try 8-)
Impressive indeed, Tony.
73,
Jose, CO2JA
---
Tony wrote:
> All,
>
> Certainly is remarkable the way Olivia mode performs under adverse
> conditions.
>
> Was having trouble decoding VK2PN in PSK31 mode d
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