[AMRadio] AM IARU Region 2 Bandplan


Bob Peters 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...

Bob W1PE

-----Original Message-----
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 
to 400W.

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
> K5MYJ
> Seattle, Wa.
> "Real Radios Glow In The Dark"

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