John and group,
Also, the one advantage that LSB has is that it tunes up toward higher
and low toward lower the way that many of us tend to think things should
work in a linear fashion:) But it also reverses the injected tones so
that the tone with the higher frequency is transmitted as a lower
Everything Peter says about BPSK operation is sideband independent
except his last point, which is a human limitation. Application
software could mitigate this if desired, e.g. by providing QSY up and
QSY down controls that take sideband into account.
73,
Dave, AA6YQ
--- In digital
The reason that LSB historically has been used for RTTY was that the
equipment in the early days had difficulty dealing with FSK. On the
demodulator side you had to choose frequencies that would not
produce harmonics to fool the demodulator. Back then the frequency
shift was 850Hz, and it wa
but it is based mainly on how PSK31, the first popular soundcard mode , is
tuned and viewed in a waterfall.
I posted about Peter Martinez's views on this before...
From the dude himself...
Andy K3UK
"You can use either upper sideband or lower sideband when using PSK31, but
there are two thin
Hi Mark,
I susbscribe to the digital radio ham group and have seen your name often. I
used to know a guy named Mark Miller that went by the nickname "Max". I just
thought I would take a stab in the dark and see if you are the same person.
Best Regards,
Manaen
Need a Digital mode QSO? Co
PSK -- which many posters here have asserted is the most popular sound
card mode -- can be used in either LSB or USB at the operator's
discretion.
73,
Dave, AA6YQ
--- In digitalradio@yahoogroups.com, John Becker <[EMAIL PROTECTED]> wrote:
>
> I ask this before but tell me again wh
Thanks Bonnie if that was a reply to my post.
Can't really tell since the subject was changed and there
was not quote makes a bit out of context.
But I guess one needs to ask if digital radio started out on
LSB why now all the sound card modes are not.
John, W0JAB
At 07:47 PM 9/22/2006, you wr
Some thoughts on the subject of Upper Sideband as International Standard.
Although either LSB or USB can be used, there are several reasons USB
has evolved as the ham standard for various digital modes and the
defacto standard for international HF comms.
USB is the "natural" polarity of the freq
I ask this before but tell me again why al the sound card
modes are on USB when all the *pre* sound card modes
(RTTY, PACKET, AMTOR & PACTOR and others) are
all LSB
Need a Digital mode QSO? Connect to Telnet://cluster.dynalias.org
Other areas of interest:
The MixW Reflector : http://grou
DuBose Walt Civ AETC CONS/LGCA wrote:
> David,
>
> Look seriously at the SDR-1000 (http://www.flex-radio.com).
>
> Walt/K5YFW
>
I've just bought another SDR1000 (finger trouble on my early one meant
that I decided to start from scratch with a ready built unit) and I'm
just setting it up aga
Hi Mel.
> Knowing absolutely nothing about the activity, could someone who
> operates portable PSK tell me what specification is required in a
> pocket PC to transmit PSK ? Normally of course I would be
> communicating from the shack.
PocketDigi works on Pocket PC devices with Pocket PC 2002 a
Thanks for the nice find Rick.
This isn't really anything new...Thompson CSF has been "fooling around" with
parallel tone modems and off-shoots of the STANAG/MIL-STD modems for quite a
while...and I expect that Marconi, Harris, Rockwell-Collins and others are
looking at all this trying to make
David,
Look seriously at the SDR-1000 (http://www.flex-radio.com).
Walt/K5YFW
-Original Message-
From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED]
Sent: Thursday, September 21, 2006 9:42 PM
To: DIGITALRADIO
Subject: [digitalradio] but which rig ?
following this modem/
jgorman01 wrote:
> Ok, folks, surely there are several of you who know what your rigs
> design is. What do some of the newer, higher priced and lower priced
> rigs use in their audio chains for amps and preamps? Do they have
> sophisticated feedback networks to equalize the amplitudes over th
Steve,
Way back in Feb or March 1990 when we were testing the Harris MIL-STD-188-110
39 tone modem at Scott AFC in TRANSCON, the assigned AF communications officer
and I formally contacted the AF Comm Command for use of the modem on AF MARS
frequencies and sent an official letter to the FCC ask
Ok, folks, surely there are several of you who know what your rigs
design is. What do some of the newer, higher priced and lower
priced rigs use in their audio chains for amps and preamps? Do they
have sophisticated feedback networks to equalize the amplitudes over
the passband or are they si
Quoting jgorman01 <[EMAIL PROTECTED]>:
> Op amps may very well be a good solution for a very linear
> amplifier. However, my point is how many current amateur radios use
> this much more expensive solution in their audio chains?
You would be surprised to find them used in many ham transceivers i
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