but.. I think the original question also asked about modes other than PSK31,
what about them?JT65A, for example is not a mode that once has to watch
ALC so much. Does anyone have a good easy to understand description of why
?
Andy
On Wed, Feb 17, 2010 at 8:42 PM, DANNY DOUGLAS
As I think I understand it, JT65 and it's varients are all very slowly
modulated which makes the waveform extremely robust. ALC, noise, flutter,
Doppler shift and intersymbol interference all have a very tough time making
much of an impact on such an incredibly rugged signal as JT65.
But this
A rough and ready explanation could be that modes which rely on phase are
degraded when you compress the TX signal (ALC displayed) - for phase modes
you must transmit a 100% clean signal, much more important then signal
strength.
Simon Brown, HB9DRV
http://sdr-radio.com
From:
Following on from this thread and reading some of Peter's comments makes me
wonder what method is best for 300 baud HF packet with a TNC? FSK or AFSK? Or
won't it make any difference? Will FSK result in a wider bandwidth?
73
Sholto
K7TMG
http://rosmodem.wordpress.com is announcing a new mode, weak signal.
Web site is down currently ...anyone tried the new mode ?
Andy K3UK
Andy obrien wrote:
http://rosmodem.wordpress.com is announcing a new mode, weak signal.
Web site is down currently ...anyone tried the new mode ?
You know me Andy, always a sucker for something different to try. ;-)
Just downloaded the file and instructions and wondering where to start
I'M QRV now with this software... will look for you Dave.
Looks fascinating.
Andy K3UK
On Thu, Feb 18, 2010 at 6:35 PM, Dave Ackrill dave.g0...@tiscali.co.ukwrote:
Andy obrien wrote:
http://rosmodem.wordpress.com is announcing a new mode, weak signal.
Web site is down currently
sholtofish wrote:
Following on from this thread and reading some of Peter's comments makes me
wonder what method is best for 300 baud HF packet with a TNC? FSK or AFSK? Or
won't it make any difference? Will FSK result in a wider bandwidth?
The main advantage of FSK, so I am led to believe,
first question is how to set PTT for various rigs. the author just joined
our group, so maybe he will help us.
On Thu, Feb 18, 2010 at 6:35 PM, Dave Ackrill dave.g0...@tiscali.co.ukwrote:
Andy obrien wrote:
http://rosmodem.wordpress.com is announcing a new mode, weak signal.
Web site is
Andy obrien wrote:
I'M QRV now with this software... will look for you Dave.
I failed at the 1st Fence Andy.
Downloaded something to be able to cope with RAR files and I'm getting a
runtime error when I try to run the executable.
So, I obviously need to sort out some problem with running the
Hey, it transmits... sounds nice...
Andy K3UK
I see the PTT switch, it uses only Comm 1 or Comm 2, I use virtual serial
ports, so will have to think about this.
Andy K3UK
Anyone know if this mode is legal in the USA. ?
Andy K3Uk
HF FSK is full power carrier. 100% duty cycle while transmitting. The AFSK
SSB mode is linear and the signal level is controlled buy the audio drive
level which must be held below the saturation point of the transmitter
stages.
Bob Macklin
K5MYJ
Seattle, Wa.
Real Radios Glow In The Dark
-
Andy obrien wrote:
Anyone know if this mode is legal in the USA. ?
Why would it not be Andy?
If it is Audio Phase Shift Keying then it's no different to PSK31, if it
is more like WSJT then as long as JT65A (and all the other WSJT modes)
are legal, then what makes this one any different?
I
I ran into this. I sent the operator a nice email. He explained that the
problem was on my end because his sig was overloading my receiver. He seemed
to know more than me so I went with his answer.
From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On
Behalf Of DANNY
Andy looking for a way to start the program. ?
Russell
1- Whoever said nothing is impossible never tried slamming a revolving door!
2- A government big enough to give you everything you want, is strong enough to
take everything you have.
- Thomas Jefferson
IN GOD WE TRUST
Russell Blair
It would be nice if it was Zipped, insted of (rar).
Russell
1- Whoever said nothing is impossible never tried slamming a revolving door!
2- A government big enough to give you everything you want, is strong enough to
take everything you have.
- Thomas Jefferson
IN GOD WE TRUST
Russell
HI,
As you know i have created a new mode at http://rosmodem.wordpress.com/
I wish you tested it and I will answer if you have any questions.
Jose Alberto
Russell, set your PTT and then just press the CQ button.
Andy K3UK
On Thu, Feb 18, 2010 at 7:36 PM, Russell Blair russell_blai...@yahoo.comwrote:
Andy looking for a way to start the program. ?
Russell
1- Whoever said nothing is impossible never tried slamming a revolving
door!
2- A
The description says it uses spread-spectrun
On Thu, Feb 18, 2010 at 7:47 PM, Dave Ackrill dave.g0...@tiscali.co.ukwrote:
Andy obrien wrote:
Anyone know if this mode is legal in the USA. ?
Why would it not be Andy?
I
Malarkey, unless you are next door to him. If ALL signals are doing so, then
maybe it is your receiver, but I much doubt it. You can listen to 14.069 for
instance, and hear the two or three kc above that freq, loaded with signals.
Watch the waterfall and you will see who is overdriving, by
Hi, tomorrow i will change PTT from COM1 to COM6, but i dont know if it'll run.
--- In digitalradio@yahoogroups.com, Russell Blair russell_blai...@... wrote:
Andy looking for a way to start the program. ?
Russell
 1- Whoever said nothing is impossible never tried slamming a revolving
As long as it is 500 Hz and 300 baud, it's fine.
-Joe, N8FQ
On Thu, 18 Feb 2010 19:04:29 -0500
Andy obrien k3uka...@gmail.com wrote:
Anyone know if this mode is legal in the USA. ?
Andy K3Uk
OK got it working now but all is dead on 20m.
Russell NC5O
1- Whoever said nothing is impossible never tried slamming a revolving door!
2- A government big enough to give you everything you want, is strong enough to
take everything you have.
- Thomas Jefferson
IN GOD WE TRUST
Russell
Andy obrien wrote:
The description says it uses spread-spectrun
How wide is 'wide'?
Not got to grips with this as yet, obviously.
Dave (G0DJA)
well, dave, wrap me in a snickers wrapper (hi), just put up a rotateable
dipole assembled from two 3 segment shrimp net poles
without the hoop and netting, cut for 20 meters it shows up at 1.3
to 1.4 vswr across the entire
20 meter band.
what's that new mode again?
73
don kf4cup
On
and blast it, i just knew i cut it 3/16 inch to short :)
74
On 2/18/2010 10:04 PM, Don KF4CUP wrote:
well, dave, wrap me in a snickers wrapper (hi), just put up a
rotateable dipole assembled from two 3 segment shrimp net poles
without the hoop and netting, cut for 20 meters it
Sick a shripm on the barbie!
Where do I get one of those poles in N. Va?
Danny Douglas
N7DC
ex WN5QMX ET2US WA5UKR ET3USA SV0WPP VS6DD N7DC/YV5 G5CTB
All 2 years or more (except Novice). Short stints at: DA/PA/SU/HZ/7X/DU
CR9/7Y/KH7/5A/GW/GM/F
Pls QSL direct, buro, or LOTW preferred,
I Do not
While frequency-hopping was first introduced in a patent filed by Nikola Tesla
in 19000, I've always been fascinated by the role of Austrian actress Hedy
Lamarr in the development of spread-spectrum.
According to Wikipedia, Lamarr had learned about the problem at defense
meetings she had
Wes,
Welcome to the digital modes. 1967 was a good year - I was also first licensed
in '67.
This web site has some interesting information about digital modes.
http://f1ult.free.fr/DIGIMODES/MULTIPSK/digimodesF6CTE_en
An important parameter is the mean/peak power ratio for each of the modes.
I forgot to mention...
I feel a little guilty when running 50 watts on PSK31 now. In the past 6
months I have logged over 50 QSOs including Japan and Europe (both 5000
miles) with less than 1 watt. It takes a little more patience but it has been
a real eye-opener to discover what can be
From
http://go2.wordpress.com/?id=725X1342site=rosmodem.wordpress.comurl=http%3A%2F%2Fwww.box.net%2Fshared%2Fq4e20pgnef
ROS uses a Spread Spectrum technique known as Frequency-hopping
spread spectrum (FHSS). In a conventional 16FSK system, the data
symbols modulates a fixed frequency carrier;
This button inserts your email address in the message between two
special characters: “” and “”. This is very important because ROS
scans all messages received and if an email is written in any of
these, ROS then automatically send you a reply with all information
received and the signal
I will be QRV ROS , baud 1 7065 LSB 0600-1300 UTC February 19. At
1300 I will switch to ROS 16 Baud 14080 USB. I will also monitor the
digitalradio sked page
http://www.obriensweb.com/sked click on digital
Andy K3UK
It rarely happens. But both times I noticed it the actually signal was very
strong +20DB. Digital is relatively new to me. This is something that would
never be noticed on phone or CW.
From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com] On
Behalf Of DANNY DOUGLAS
Sent:
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