You've forgotten about the nasty reality of AGC and receiver overload.
For what you say to be true, one must disable the AGC and the receiver
must have the dynamic range/overload capability to not fold with the
wider bandwidth. If they did we would never need narrow filters. Many
rigs have no off
for 400 Hz bandwidth
transmissions.
73
Patrick
- Original Message -
From: Brian A
To: digitalradio@yahoogroups.com
Sent: Friday, November 02, 2007 1:29 PM
Subject: [digitalradio] Re: ALE400 - Narrow band ALE mode now
available
I'm not trying
--- In digitalradio@yahoogroups.com, Brian A [EMAIL PROTECTED] wrote:
1) Using a 200 Hz filter instead of 400 or 500 Hz filter gives a 3db
S/N ratio improvment-- PSK or RTTY. It's guaranteed.
It is not. Using narrower filter will reduce total noise and out of
channel QRM, lowering dynamic
Brian,
It depends upon what you, or the average ham, are looking for. If you
want to do contesting, and if the inertia stays with RTTY, then that is
what will remain as a popular mode. A couple of decades ago, many of us
found RTTY to be quite interesting and even built TU's to get on HF.
Yes, the laws of physics do get in the way.
They say that wider bandwidth is the technique to use. The trick in that
situation is that the bandwidth is used by multiple users at the same time.
Everyone is background noise to the other guy.
Rud Merriam K5RUD
ARES AEC Montgomery County, TX
I'm not trying to be a pain in the butt, honest.
If one put ALE400 and RTTY side by side for the average ham ALE-400
would be a hard sell. Same speed in twice the bandwidth.
I guess one may conclude all the bells and whistles of ALE, ARQ etc
are doubling the bandwidth requirements. One can
Hi Brian,
At 08:29 AM 11/2/2007, you wrote:
I'm not trying to be a pain in the butt, honest.
Neither is my reply meant to be anything other than pointing out the obvious.
We need narrower bandwidths not wider bandwidths for real progress
with the real life crowded bands. I think that is
So one gets the 60wpm of 170Hz shift RTTY for a 400 Hz bandwidth?
73 de Brian/K3KO
--- In digitalradio@yahoogroups.com, Mark Thompson [EMAIL PROTECTED] wrote:
ALE400 Narrow band ALE mode now available
Patrick F6CTE has announced that a narrow band version of the
popular Automatic Link
