Paul, it works, at least in part, because the huge numbers of US
amateurs in proportion across the border are regulated both by mode and
by bandwidth. Radio does not stop at borders, of course, so what makes
it work for the US helps make it work for Canada. Imagine what it would
be like if
Could I ask you to explain this in terms a ham would understand?
--- In digitalradio@yahoogroups.com, iv3nwv nico...@... wrote:
In a message oriented and power limited fading communication system what
counts is the relationship between the channel coherence time (the time
interval over
I'm not sure I follow this argument. The fundamental problem is that, within
the area allocated for digital modes, there is not enough space for many
simultaneous contacts to take place using a 2.2kHz wide mode. This has not
hitherto been much of a problem because until now there has not been
Your figures for digital modes seem to assume we can use all the band from the
bottom. In fact, digital starts at typically x.070 so there is really only room
for half the number of digital stations. Also, if you can really go up to x.150
why has ROS jumped on top of Olivia when there is
Nico,
I agree 100%. What's needed more than anything is the ability to determine
whether a frequency is in use, then we can hop around as much as we want as
the MUF changes.
As for the FCC - let's just be happy that they only legislate for the US
possessions (colonies) :)
Simon Brown, HB9DRV
Your are right, Julian. The current regulations mostly protect phone
users from interference by other modes and digital users are left to
figure out how to share what space is left. The division is
approximately 50-50 between phone and digital what the FCC calls
'data/RTTY'. This is a holdover
Julian,
Digital is what the FCC calls CW-RTTY/data. CW is digital so it is
included and that is why the digital segment starts at 14.000. The ROS
author is not a ham. I don't know who is guiding him, but legally as far
as the US is concerned, he could go higher still and avoid Olivia, but I
CW is still the most-used digital mode, about .2 kHz wide, depending upon the
speed, then RTTY, and now, PSK31, are next, and all the other digital modes
have to make do with whatever space is left.
Has the ARRL or any other group conducted an scientific unbiased study of the
digital modes on
Hi Julian,
By channel coherence time do you mean time when the signal is readable?
The channel choerence time is a property of a (fading) channel which gives an
idea of the time interval over with the channel response is approximately
*constant*.
If you drive your car at 100 km/h and tune
But grin Two points:
IARU / ARRL band plan to manage the frequencies, allocating areas for
unattended, digital, analog, etc signals.
The underlying regulation of good amateur practice as the stick for
enforcing the band plan.
If you operate unattended in the analog band plan section the
The hope was that PSK63 could replace RTTY, being both spectrally more
efficient, and more usable for a panoramic presentation for contesters
to see who is on the band, but it never came about. Too bad, I think,
because it would help reduce congestion during contests. PSK63's overall
time to
--- In digitalradio@yahoogroups.com, KH6TY kh...@... wrote:
Julian,
Digital is what the FCC calls CW-RTTY/data. CW is digital so it is
included and that is why the digital segment starts at 14.000. The ROS
author is not a ham. I don't know who is guiding him, but legally as far
as the
It also doesn't suffer from the ridiculous printing up garbage because a shift
character was lost. If there ever was an outdated mode, it's RTTY.
Unfortunately logic or technical arguments play very little part in the reason
why people choose to use particular modes. Many RTTY operators insist
EPC runs a PSK63 contest, and the mode works quite well. Panoramic reception
and broadband decoding are a potent combination.
It's the only contest I've ever entered, and I took first place in NA, hi.
73,
Dave, AA6YQ
From: digitalradio@yahoogroups.com
The advantage of using FSK is that one can take advantage of the excellent
RTTY filters built into some transceivers. These filters are generally not
available when operating in USB/LSB. This is particularly important to
contesters operating in a crowded environment and DXers dealing with weak
Julian,
Using FSK instead of AFSK means you can run a big amp Class-C and get
more power output. Also, you do not have to worry about preserving
linearity on a Class-AB or Class-B amplifier if running FSK,or figure
out how to interface the computer to the rig for AFSK.
Many of the big guns
I assumed that people kept using FSK because paths to Europe can have 20-30 Hz
of Doppler spread.
73,
John
KD6OZH
- Original Message -
From: KH6TY
To: digitalradio@yahoogroups.com
Sent: Tuesday, March 09, 2010 19:08 UTC
Subject: Re: [digitalradio] Re: 1976 FCC - Delete all
El 09/03/2010 02:08 p.m., KH6TY escribió:
Using FSK instead of AFSK means you can run a big amp Class-C and get
more power output. Also, you do not have to worry about preserving
linearity on a Class-AB or Class-B amplifier if running FSK,or figure
out how to interface the computer to the
I've had nothing but good luck with the Rascal. Used it for about 7 years.
The newer ones now support PTT over a USB cable.
Some of the connectors, particularly radio connectors, can be difficult to
solder up, so the radio cable for your radio included with the Rascal is very
nice.
Support
Hello All,
Suppose I would build an transmitter with a x-tal oscillator, lets say
running at 7040.000 Hz
Part of the system was a balanced modulator and just to make sure a
a high quality crystal filter, with a 1:1.05 shape factor, was added
in the driver stages for the final amplifier.
With a
Jose
If you think this is fun then you have a very huge problem.
LA5VNA S
On 09.03.2010 14:52, jose alberto nieto ros wrote:
The question would be: can Dragon Link work for EME operation?
If the answer is YES, then Dan Henderson will tell you Dragon Link is illegal.
If the answer is NO,
El 09/03/2010 03:55 p.m., rein...@ix.netcom.com escribió:
Hello All,
Suppose I would build an transmitter with a x-tal oscillator, lets say
running at 7040.000 Hz
Part of the system was a balanced modulator and just to make sure a
a high quality crystal filter, with a 1:1.05 shape factor,
Warren K5WGM. You wrote that English is not your strongest point. Well it seems
to me you did it pretty good, you expressed yourself magnificently !
Kind regards, Mel G0GQK
Jose,
Oversight, we are certainly not allowed to transmit Music!
73 Rein W6SZ
-Original Message-
From: José A. Amador ama...@electrica.cujae.edu.cu
Sent: Mar 9, 2010 1:26 PM
To: digitalradio@yahoogroups.com
Cc: rein...@ix.netcom.com
Subject: Re: [digitalradio] Re: Question for experts
Sorry, posted in wrong group
la5vna Steinar
On 09.03.2010 19:13, Steinar Aanesland wrote:
Jose
If you think this is fun then you have a very huge problem.
LA5VNA S
On 09.03.2010 14:52, jose alberto nieto ros wrote:
The question would be: can Dragon Link work for EME operation?
One exception to that would be if it is part of a NASA rebroadcast
IE: Wake-Up or Morning music on the Shuttle
David
KD4NUE
-Original Message-
From: digitalradio@yahoogroups.com [mailto:digitalra...@yahoogroups.com]
On Behalf Of rein...@ix.netcom.com
Sent: Tuesday, March 09,
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 the question we can't address
here any longer.
I used a x-tal
David,
Agreed, the exception to the rule!
73 Rein W6SZ
-Original Message-
From: David Little dalit...@bellsouth.net
Sent: Mar 9, 2010 2:21 PM
To: digitalradio@yahoogroups.com
Subject: RE: [digitalradio] Re: Question for experts
One exception to that would be if it is part of a NASA
Thanks, I am trying
--- On Tue, 3/9/10, raf3151019 gzero...@btinternet.com wrote:
From: raf3151019 gzero...@btinternet.com
Subject: [digitalradio] Re : 1976 FCC
To: digitalradio@yahoogroups.com
Date: Tuesday, March 9, 2010, 4:06 PM
Warren K5WGM. You
I've heard this argument many times, Dave, but whilst it was probably true 10
or more years ago, surely all decent modern transceivers have a dedicated data
mode that allows the use of narrow filters? Heck, even the humble FT-817 has
one.
Julian, G4ILO
--- In digitalradio@yahoogroups.com,
From: KH6TY kh...@comcast.net
To: digitalradio@yahoogroups.com
Sent: Tue, March 9, 2010 2:08:20 PM
Subject: Re: [digitalradio] Re: 1976 FCC - Delete all Emission Types from Part
97
Julian,
Using FSK instead of AFSK means you can run a big amp Class-C and
- Original Message
From: rein...@ix.netcom.com rein...@ix.netcom.com
To: digitalradio@yahoogroups.com
Sent: Tue, March 9, 2010 5:11:30 PM
Subject: Re: [digitalradio] Re: Question for experts
Hello Jose,
Multiple Frequency Shift Keying, OK, but you really
did not answer my question,
KH6TY kh...@... wrote:
Paul, it works, at least in part, because the huge
numbers of US amateurs in proportion across the
border are regulated both by mode and by bandwidth.
Hi Skip,
Perhaps you may want to re-phase that?
USA ham sub-bands are regulated by content
rather than
Yes, lots of modern transceivers have a dedicated data mode, but they're
generally too wide for optimal RTTY reception. In contrast, consider the
Twin Peak filter available on recent Icom transceivers, for example; it's
only available with the transceiver's mode set to RTTY.
73,
I guess I can chime in here with my 2 bits. Why not use cw as the common
communication mode. My computer, using MultiPSK, can read CW quite well. And
I understand that morse code recognition actually uses very little of the
computer's resources. It is relatively easy to add a function to a
No, not by content, except for unallowed transmission of music,
pornography, business communications, etc., there is no regulation by
content. You can say or send whatever you wish. Content is the data
delivered. The actual wording in the regulations is emission type
instead of mode, but most
Thank you for your interest in our services. In order to assist you in your
endeavour, you are required to submit the standard retainer fee of US$1,000,000
(One million US Dollars) into our company bank account. Please contact us
directly via email to unit...@hotmail.com for further
-Original Message-
From: Ralph Mowery ku...@yahoo.com
Sent: Mar 10, 2010 12:25 AM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Question for experts
- Original Message
From: rein...@ix.netcom.com rein...@ix.netcom.com
To: digitalradio@yahoogroups.com
Sorry Ralph,
I did not read the header.
3 Rein W6SZ
-Original Message-
From: Ralph Mowery ku...@yahoo.com
Sent: Mar 10, 2010 12:25 AM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Question for experts
- Original Message
From: rein...@ix.netcom.com
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 the
Correct but you still have not answered my question. Indeed If I
use one tone and key it on / off I have a cw transmitter, transmitting
on the VJO frequebcy = or - the audio frequency.
What do I have if I just change the tones in a random fashion?
73 Rein W6SZ
If a total random fashion,
I can't fathom the reason for doing that, but if the tone frequencies
are pseudo-randomly generated and then modulated by either on/off keying
or some other way, you will have a spread spectrum system, similar to
what is done in the ROS 2200 Hz-wide modes. The tones in a ssb
transmitter simply
Hi Skip,
Thanks, we have arrived at the point I wanted to get to,
So lets go a little further on this path, suppose I changed the
tones in a not so random fashion. Like I had a way to generate
tones as I do when I speak or make music or like some of those synthesizers
or whatever they are, do
Hi Jose,
Thanks much for your time. I am trying to understand the difference between
a certain unnamed modulation mode and single sideband with high carrier
suppression.
Looked upon from the inside and the outside but still with stable x-tal carrier
as input
to a balance modulator or perhaps
Hi Ralph,
You got me again. Indeed the Commission requires that it has to be intelligent
information, and certainly any ID needs to be made in the English language or
in Morse code, not quite sure about Morse only, or other methods allowed.
One could speak as a member of an Indian tribe as was
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 Moweryku...@yahoo.com
Sent: Mar 10, 2010 12:25 AM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Question for
46 matches
Mail list logo
