K1DG stated:
"A couple of years ago I did a quick analysis and discovered he was right!
The control case was N1UR, who operated the CQWW contest many years in the
low power category, then turned on an amplifier and raised his score about
75%, or about 6% per dB! Same op, same QTH, same antenn
Hi Jim,
I think I wasn't really clear about that. I agree that each decibel
matters. It matters for transmit AND for receive. Now *that* is clear:)
The maximum power I have available to try and radiate is around about
100 watts. My QRP transmitter for top band is a Johnson Ranger at about
30
I spent part of my engineering career designing satellite command FSK
demodulators - including the deep space Pioneer Venus orbiter. To test
the performance of them, we would mix the test signal with white noise.
When you look at the FSK Bit-Error-Rate (BER) curve (bit errors versus
signal to
On Fri,2/26/2016 9:49 AM, Doug Grant wrote:
Many years ago K1JX casually commented that contest scores improve 6%
per dB. I filed that away for future reference.
A couple of years ago I did a quick analysis and discovered he was right!
There's clearly a difference, but the magnitude of the dif
>
> ... Maybe most of those hams who preach otherwise have less interest in
> weak signals. ..
>
I fully agree. It's when the S-meter isn't moving that a dB or two really
matters! If we're 10 over 9 and in the clear, that's different.
73, Mike
www.w0btu.com
_
Topband Reflector Arc
Many years ago K1JX casually commented that contest scores improve 6%
per dB. I filed that away for future reference.
A couple of years ago I did a quick analysis and discovered he was right!
The control case was N1UR, who operated the CQWW contest many years in
the low power category, then turne
the noise, or not.
72/71.5 de Jim R. K9JWV
From: Topband on behalf of Bill Cromwell
Sent: Friday, February 26, 2016 5:58 AM
To: topband@contesting.com
Subject: Re: Topband: Demo of the value of one dB and the cost of sending too
fast
Hi,
Doubling the po
Hi,
Doubling the power output translates to less than one "S-unit" at a
distant receiver. Maybe most of those hams who preach otherwise ahve
less interest in weak signals. That is a matter of personal interest and
personal taste. Don't forget that all of this applies on receive, too.
There i
>
> - its well worth the effort to improve your signal by as little as one dB
>
It certainly is! This is quite interesting.
How many hams have we heard over the years preaching otherwise? "But it's
ONLY a fraction of an S-unit!".
73, Mike
www.w0btu.com
_
Topband Reflector Archive
Great stuff, pays also if you are a dxer to read old QST articles, one
of these
is "station design for DX" tells about what a DB can do, as I
remember one
quote from the article " 1db opens a whole new layer of weak DX to work"
Its true and its worth the work if your even half serious abou
Wow, this is very good Frank. I can't count the number of times I've been
trying to dig out a weak stn and jokingly made the statement "If I only
had ONE dB more of signal from the station"! What's proven here is I
really wasn't joking!!!
Good info. Thanks for sharing the link to AB7E's info.
73
On Thu,2/25/2016 8:40 AM, donov...@starpower.net wrote:
its well worth the effort to improve your signal by as little
as one dB
Pro sound engineers have long appreciated this fact. It is well known
that one dB matters when it is close to the level of interfering sounds,
but not at all when th
The weak signal CW recordings on AB7E's website are well worth
a few minutes to listen to. His recordings clearly demonstrate
-- much more convincingly than any other demo I've ever heard--
the significance of one dB of improved signal strength and the cost
of sending too fast under weak signa
13 matches
Mail list logo
