Al:
There are lots of poor to very poor SSB signals on the bands. When I say
poor to very poor I am referring to proper spectral balance. Hams
rely too much on "what others say" with regard to their signals and
audio. Best is to use a remote SDR receiver, and there are many on line
around the world, to record and listen to the audio. Monitoring ones
voice with headphones or speaker is far from accurate. There is too
much sound transmitted via bone conductivity in the head to judge ones
signal.
The recommendations of Jim, K9YC and of Joe, W4TV, and on the Heil
website is very valuable information. Bottom line, the is little need
for audio below about 300 Hz. Should your radio have EQ or LF TX
roll-off, attenuate the low frequencies and preferably not boost the
high frequencies. Hams always seem to think boost this and boost
that, and give very little thought to attenuate this and attenuate
that. It all works best if one attenuates the excessive energy first.
Just comments from and old retired recording studio sound engineer of
30+ years. Made a darn good living at it too.
73
Bob, K4TAX
On 12/4/2024 2:20 PM, [email protected] wrote:
Message: 7
Date: Fri, 29 Nov 2024 17:15:21 +0000 (UTC)
From: Al Lorona<[email protected]>
To:"[email protected]" <[email protected]>
Subject: Re: [Elecraft] K3 sidetone level
Message-ID:<[email protected]>
Content-Type: text/plain; charset=UTF-8
Tuning around on 40 meters today, I saw a signal on the P3 where the energy
from 0 - 400 Hz was 15 dB higher than the energy above 400 Hz. I see a lot of
signals like this. You probably do, too.?
I did the math... (taking into account power spectral density) if his output
power was 100W, then 80 W were in the frequencies below 400 Hz, and 20 W were
in the frequencies above. That poor guy was operating QRP without even knowing
it, in the frequencies that really matter for speech. He could be quite a bit
stronger without spending a single dollar, merely by equalizing his audio.
I notice that SSB signals that appear more or less flat across their bandwidth,
as seen on the P3, are extremely articulate and seem to pop out of the
speakers. To get a signal like this, you have to follow Jim's (K9YC) EQ'ing
guidelines or make some kind of measurements to tell you what your transmitted
passband looks like.
Al? W6LX/4
______________________________________________________________
Elecraft mailing list
Home: http://mailman.qth.net/mailman/listinfo/elecraft
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:[email protected]
This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
Message delivered to [email protected]
