STOP hijacking threads please.
Jim W7RY
On 10/25/2022 8:46 PM, John wrote:
---------- Original Message ----------
Date: 10/25/2022 8:38 PM
Subject: Re: [repeater-builder] QUANTAR VHF Audio
Interface...
Yes, Burt, I also agree with
that concept because it is better in those circumstances of
low initial audio and to me it also makes sense to increase
intelligibility when you are receiving noise on the
repeater.? It does usually reduce the highs from them being
selectively clipped, so the question is how do you boost the
highs back when the clipping is done on pre-emphasized audio
where flat audio is defined by the same voltage at the
clipper when the input frequency is swept from lowest to
highest frequency at the same input deviation? By adding
high frequency boost after the clipper, and then more low
pass filtering? Possibly easier and better to just eliminate
the pre-emphasis components before the clipper, and add
comparable pre-emphasis after the clipper so a little audio
compression without reducing highs and still the same low
pass roll-off. There must be a way to configure Kevin's
clipper /filter to achieve this result.
To my
thinking, the advantage from having no repeater compression
or clipping is when you want to repeat a repeat times X in
analog so as to not keeping adding background noise or
distortion each time, at least on the link radios if a quiet
link path. Guess that is one big advantage of digital
repeaters?
John
On 10/25/2022 4:47 PM Burt K6OQK
<biwa@...>
wrote:
John,
I personally do not believe in the 5 kHz in and 5 kHz out
thinking.? A part of the problem is that stations with low
deviation will come through with low deviation and those with
high deviation can hit the transmitter's limiter too hard.?
Some believe that it's the responsibility of those stations to
correct their deviation, and learn to use correct mic
technique. My experience in that area has proven to be: Good
Luck!
Please understand, I don't mean to be talking at you, but just
intellectualizing with you...
To my way of thinking, a repeater is not a piece of test
equipment to be used as a deviation tester.? It's a
contraption to improve / enable communications.? Proper
processing also protects the transmitter and adjacent channel
spectrum in a less destructive way.? Anything I can do to make
it simple, reliable, and pleasant, is a plus.? That's why I
have always used appropriate audio processing on my
repeaters.? I've gotten arguments from the unwashed telling me
that it brings up the noise on the incoming signal. Well, yes,
that's true, but you're going to have to turn up the volume at
the user's end if you want to hear those stations anyway.?
When you do that you are not only bringing up the noise heard
by the repeater, but also any noise between and the
repeater.? Having to turn the volume up and down while
listening to a repeater gets tiring after a while.
For what it's worth,
Burt, K6OQK
--
Thanks and 73, Jim W7RY
