[Elecraft] OT (Yamaha Cm 500)

[Joe Subich, W4TV]

 > What do you think of the idea of adjusting the equalizer so that the
 > peak spectrum is flat across the SSB bandwidth?

It's probably a good starting point but I would also listen to the
audio on a second receiver and have it evaluated by someone who can
make critical evaluation off air.

 > 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

I think that is doing too much cutting at the low end and not
enough boost at the high end.  Adding 6 dB at each band from
200 Hz to 3.2 KHz would make me more comfortable.  Like, Jim
I prefer to leave 50/100 at -16 regardless as they contribute
nothing to communication.

73,

    ... Joe, W4TV

On 11/16/2010 3:18 PM, Alan Bloom wrote:
> 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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