[Elecraft] Yamaha CM500

[Luis V. Romero]

No problem, Jim:

Its not that I cant make the Electret CM-500 work on the Orions at NQ4I (I
have the bias box), its just that the mic sounds really bad on that rig, no
matter what I try to do with the rig's EQ, or what little EQ capability is
in the rig (They are Orion 1's).  These Orions are really bassy.  I have
diddled with the carrier shift and transmit bandpass and have gotten the
rigs to sound pretty good, but there is still a lot of difference between
the radios (there are 8 of them), even with the same exact settings.  

I have been "volunteered" as the audio guy up there.  Of all the mics we
have tried (and we have tried a lot of them), These Orion 1's seems to
really like the DX4 capsule.  Recently, Rick has begun installing W2IHY EQ
Pus units, and these seem to make the Orions sound quite good.  The IHY
compressor is leagues ahead of the TenTec internal processor.  This along
with some transmit bandwidth contouring has really "unmuddied" the stations.
There are EQ Plus units on 20 run and 40 run now, with 80 run coming soon,
then 15 run. 

I will keep that circuit in mind for other uses, maybe with an Icom 7700.

-lu-w4lt
K3 # 3192




Date: Fri, 19 Nov 2010 11:15:02 -0800
From: Jim Brown <jim at audiosystemsgroup.com>
Subject: Re: [Elecraft] Yamaha CM500
To: elecraft at mailman.qth.net
Message-ID: <4CE6CCB6.70104 at audiosystemsgroup.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

On 11/19/2010 5:48 AM, Luis V. Romero wrote:
> when I travel to NQ4I, where my CM500 does not work!

Lu -- thanks for the detailed rundown on the Koss unit.

I don't know what radios are at NQ4I, but I'm headed to PJ4 for CQWWCW, 
where FT1000MPs are used. Before and after the contest, I may want to 
work SSB, so I made a simple connector adapter for my CM500 mic (8-pin 
mic plug, one resistor, short length of coax, to female TRS 1/8-in 
jack). Last night, I checked it out with the MP that's still in my 
closet as a backup rig.  I had to turn down the mic gain a LOT, but K6XX 
tells me that it sounds fine.

The resistor goes from the 8VDC pin on the mic connector to the MIC hot 
pin on the connector.  I think I used 4.7K or 6.8K.  Any value in that 
range is fine.

73, Jim K9YC

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