[Elecraft] OT (Yamaha Cm 500)

[Alan Bloom]

Jim and Joe,

What do you think of the idea of adjusting the equalizer so that the
peak spectrum is flat across the SSB bandwidth?  With my voice I had to
considerably attenuate the low audio frequencies and boost the highs to
achieve that.

There's a way to measure the transmitted spectrum using a P3, as
described in the most recent version of the Owner's Manual.  I ended up
with:

50 Hz   -16 dB
100 Hz  -16 dB
200 Hz  -16 dB
400 Hz  -10 dB
800 Hz  -16 dB
1.6 kHz   0 dB
2.4 kHz  +3 dB
3.2 kHz  +6 dB

(The -16 dB at 800 Hz was based on someone's suggestion that little
voice information occurs around that frequency.  Otherwise it would
probably have been -3 or -6 dB.)

Al N1AL


On Tue, 2010-11-16 at 14:29 -0500, Joe Subich, W4TV wrote:
> >> Recommended TXEQ for the CM500 is max cut of the two lowest bands,
> >> somewhere between 6dB cut and max cut of the third band, depending
> >> on your voice, and flat (0 dB) for the remaining bands.
> 
> While I agree with Jim on the lowest three bands, I strongly prefer
> a 3 to 6 dB/octave rising characteristic for the top three bands
> (e.g., +3, +5, +6 or +6, +10, +12).  The rising characteristic helps
> considerably with "clarity" and the ability to cut through the crud.
> 
> 73,
> 
>     ... Joe, W4TV
> 
> 
> On 11/16/2010 12:22 PM, Jim Brown wrote:
> > On 11/15/2010 7:35 PM, Chris Hembree wrote:
> >> Just got my CM 500 today. Would someone please tell me what the black box with 2AAA batteries is for.
> >
> > It's for when you want to use the mic with something that does not
> > provide voltage for the electret element.  Contrary to what some Yamaha
> > descriptions says about the mic, it is an electret mic, not a dynamic
> > mic.  You do NOT need it with a K3. Simply plug it into the rear panel
> > mic connector, turn on the bias (see the manual), and adjust levels just
> > like you would with any other mic (again, following the directions in
> > the manual.
> >> Plus how do you like the mic on the cm500?
> >
> > I love it, and so do most who have used it.  It provides very clean
> > audio, and, using TXEQ can easily be made very competitive for
> > contesting and DXing, or more mellow for casual rag chewing. It sounds
> > better than most Heil mics I've heard.  Recommended TXEQ for the CM500
> > is max cut of the two lowest bands, somewhere between 6dB cut and max
> > cut of the third band, depending on your voice, and flat (0 dB) for the
> > remaining bands. Use the LOW setting for Mic Gain in the Menu.
> >
> > 73, Jim K9YC
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