|[AMRadio] AM IARU Region 2 Bandplan|
rwpeters at swbell.net
Mon Mar 8 15:36:00 EST 2010
Bob,DGN, You can throttle the above 3 K off with an EQ and not let the
transmitter pass the above 3K audio... I run a GATES BC1G which goes out a
lot more then 3K but have it throttled off and can run 100% or more positive
peaks keeping the negative side down below 100% with a limiter...Robert WW9W
runs the same thing with a BC610 and sounds great...
From: amradio-bounces at mailman.qth.net
[mailto:amradio-bounces at mailman.qth.net] On Behalf Of rbethman
Sent: Monday, March 08, 2010 2:29 PM
To: Discussion of AM Radio in the Amateur Service
Subject: Re: [AMRadio] AM IARU Region 2 Bandplan
This is wonderful in theory.
So what are we supposed to do with WWII era equipment such as BC-610s?
The entire audio chain goes from 400 to 3500cps. Guess I'll just
continue along as I have been doing since I got both of them.
I do run a monitor scope, and I know it is clean. I do have to throttle
it down with regard to audio gain. If I don't, the PEP out WILL exceed
2000W in a heartbeat!
I found this out after finally getting a peak reading Bird. I was
hitting 2500W PEP and hadn't known this as earlier I only had to worry
about my Amp Supply LK-500ZB.
I certainly am NOT running music! The resting carrier is "mighty" close
Bob - N0DGN
On 3/8/2010 2:23 PM, Bob Macklin wrote:
> All that is need for communications grade AM is 300Hz to 3KHz audio. Just
> use a 6db/octave rolloff at 3KHz.
> There is not much 3KHz or higher energy in the human voice.And we are not
> supposed to be playing music.
> Bob Macklin
> Seattle, Wa.
> "Real Radios Glow In The Dark"
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