Re: [Elecraft_K3] New subject: Modulation monitoring

Mel Farrer <farrerfolks@...>

While all of your comments are worthy of discussion, I think the topic was hams need to produce the cleanest, richest sounding signal they can.  Albeit a FCC related topic, that is not what I am proposing.  I have heard some really bad distorted audio in narrow band transmissions.  Lets clean them up with a little self monitoring.  Like a modulation monitor option with the LCD displays on the radios.  Simple no??

I have recently purchased a battery powered LCD scope from China that will allow me to have a dedicated monitor of modulation.  Less than $100.  If they can build a two channel scope for that much money, how much would it take to put the option in the P3??  I hope this is a constructive comment.

Mel, K6KBE

--- On Sat, 12/19/09, Jerry T. Dowell wrote:

From: Jerry T. Dowell
Subject: RE: [Elecraft_K3] New subject: Modulation monitoring
To: Elecraft_K3@...
Date: Saturday, December 19, 2009, 1:55 PM


Actually, 1% of the transmitted power is at the -20 dB level, not the -10 dB
level (which would be 10% of transmitted power).

Jerry AI6L

____________ _________ _________ _________ _
From: Elecraft_K3@ yahoogroups. com [mailto:Elecraft_K3@ yahoogroups. com] On
Behalf Of Alan Bloom
Sent: Saturday, December 19, 2009 11:56 AM
To: Elecraft_K3@ yahoogroups. com
Subject: RE: [Elecraft_K3] New subject: Modulation monitoring

On Sat, 2009-12-19 at 14:27 -0500, Joe Subich, W4TV wrote:
> > By the way, I hope everyone noticed that the definition of
> > occupied bandwidth is that which contains 99% of the
> > transmitted power. Your 3 dB or 6 dB bandwidth must be quite
> > a bit less than that.
> 1% of transmitted power is the -10 dB level ... not much below
> the 6 dB bandwidth.

Yes, after posting that I thought about it some more. The response of
most crystal filters drops rapidly past the -6 dB point, so the 99%
occupied power bandwidth is probably not much greater than the - 6 dB

Alan N1AL

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