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First report about my new Yamaha CM-500

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AD4C2009

First report about my new Yamaha CM-500

Well folks,finally after 2 months wait my boomset from Yamaha,arrived this afternoon.
It look and feel very professional,the headset is big enough to cover my ears completeley,it isolate me from the outside world,they feel confortable.
When I plug it into my K3 front panel phones jack,my first impression was WOW!! this sound great,for years I was using the Sony MDR-V150 that are sold in local audio stores for $20 and I thougt they were the best in the market,they really sound wonderful with any radio but these Yamaha leaves in the dust my old Sony,the audio quality is awsome,if you hear AM broadcast stations the "lows" are deep solid without any distorsion,even on ESSB If you find some one transmitting that wide,you enjoy that sweet sound.
Now comes the mic,it needs 3V DC power,it comes with a little plastic case where you insert a couple of AAA batteries to feed the mic,then I connected it to the rear mic input and trough the quick config menu set it to "rPH" and bingo,nice TX audio,the gain is much higher than any of all the mics I have been using with my K3,so I had to lower the mic gain to just 10 and comp to same level,VOX works very easy with this mic,I set lastly the mic EQ and my audio goes very well balanced from 100 to 3000 hz.
Its 00:30 UTC in SE FL now,I am on 40M if anyone will like to hear me on the air with it I will be available all night,just send me a direct email.
I can tell that for just $38 this is a great investment that will put Heil to think about how to improve their mics or at least make them more afordable.
If you have not order one of these,don't hesitate,do it.

AD4C

"For a refined ham it is compulsory to own a k3"

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n7ws

Re: First report about my new Yamaha CM-500

Hector,

Glad you like it. I have been using mine for months. But with the K3 rear input, you do not need the battery bias box. The K3 will supply the bias you need.

Wes N7WS

--- On Fri, 1/15/10, Hector Padron <[hidden email]> wrote:

> From: Hector Padron <[hidden email]>
> Subject: [Elecraft] First report about my new Yamaha CM-500
> To: [hidden email]
> Date: Friday, January 15, 2010, 5:34 PM
> Well folks,finally after 2 months
> wait my boomset from Yamaha,arrived this afternoon.
> It look and feel very professional,the headset is big
> enough to cover my ears completeley,it isolate me from the
> outside world,they feel confortable.
> When I plug it into my K3 front panel phones jack,my first
> impression was WOW!! this sound great,for years I was using
> the Sony MDR-V150 that are sold in local audio stores for
> $20 and I thougt they were the best in the market,they
> really sound wonderful with any radio but these Yamaha
> leaves in the dust my old Sony,the audio quality is
> awsome,if you hear AM broadcast stations the "lows" are deep
> solid without any distorsion,even on ESSB If you find some
> one transmitting that wide,you enjoy that sweet sound.
> Now comes the mic,it needs 3V DC power,it comes with a
> little plastic case where you insert a couple of AAA
> batteries to feed the mic,then I connected it to the rear
> mic input and trough the quick config menu set it to "rPH"
> and bingo,nice TX audio,the gain is much higher than any of
> all the mics I have been using with my K3,so I had to lower
> the mic gain to just 10 and comp to same level,VOX works
> very easy with this mic,I set lastly the mic EQ and my audio
> goes very well balanced from 100 to 3000 hz.
> Its 00:30 UTC in SE FL now,I am on 40M if anyone will like
> to hear me on the air with it I will be available all
> night,just send me a direct email.
> I can tell that for just $38 this is a great investment
> that will put Heil to think about how to improve their mics
> or at least make them more afordable.
> If you have not order one of these,don't hesitate,do it.
>
> AD4C
>
>
> "For a refined ham it is compulsory to own a k3"
>
>
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

Bob Naumann W5OV

Re: First report about my new Yamaha CM-500

I just received my CM-500s and am using the rear mic jack. Works fine that
way with lo gain, bias on.

As Jim reported, the mic has a lot of gain. It's quite bassy compared to the
Heil but the EQ takes care of that.

I opened the package and 10 minutes later I'm all set. The ear pieces are
nice and large. Comfy so far.

Bob W5OV

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Wes Stewart
Sent: Friday, January 15, 2010 7:23 PM
To: [hidden email]; Hector Padron
Subject: Re: [Elecraft] First report about my new Yamaha CM-500

Hector,

Glad you like it. I have been using mine for months. But with the K3 rear
input, you do not need the battery bias box. The K3 will supply the bias
you need.

Wes N7WS

--- On Fri, 1/15/10, Hector Padron <[hidden email]> wrote:

AD4C2009

Re: First report about my new Yamaha CM-500

yes Bob,very confortable,I have been dxing and ragchewing for 2 hours now on 40M and I don't feel them on my ears,I cut the lows with the EQ and my audio goes now from 150 to 3100hz,its easy to EQ any mic wiith the K3.
I just ended a QSO with W2QN few mins ago and he reported me excellent TX audio with this CM500.
Good buy for $38 right ?

AD4C

"For a refined ham it is compulsory to own a k3"

--- On Sat, 1/16/10, Bob Naumann <[hidden email]> wrote:

From: Bob Naumann <[hidden email]>
Subject: Re: [Elecraft] First report about my new Yamaha CM-500
To: [hidden email]
Date: Saturday, January 16, 2010, 1:31 AM

I just received my CM-500s and am using the rear mic jack. Works fine that
way with lo gain, bias on.

As Jim reported, the mic has a lot of gain. It's quite bassy compared to the
Heil but the EQ takes care of that.

I opened the package and 10 minutes later I'm all set. The ear pieces are
nice and large. Comfy so far.

Bob W5OV

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Wes Stewart
Sent: Friday, January 15, 2010 7:23 PM
To: [hidden email]; Hector Padron
Subject: Re: [Elecraft] First report about my new Yamaha CM-500

Hector,

Glad you like it. I have been using mine for months. But with the K3 rear
input, you do not need the battery bias box. The K3 will supply the bias
you need.

Wes N7WS

--- On Fri, 1/15/10, Hector Padron <[hidden email]> wrote:

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David Christ

bias for Yamaha CM-500

In reply to this post by AD4C2009

I'm trying to understand the bias requirements for the CM-500
specifically and electret/condenser (which is it) mikes in general.

Yamaha's adaptor uses 3V (2 AAA batteries) in series with a 2.2K
resistor and a 1 microfarad DC blocking capacitor. I would rather
not depend on batteries. My reading of the KSB2 manual says to use
10K fed from 5V while I have heard that it should be 10K for this
unit. I am not sure what my K3 is supplies. I would also like to use
the mike with a Kenwood TS-940. That rig has 8V available at the
mike connector. So if I build an adaptor to use with that rig what
is the proper value resistor to use? Or should I build a quickie 3V
regulator fed from the 8V and then use a 2.2K resistor? I presume I
would need some value of DC blocking capacitor for the Kenwood.

How does one determine the proper voltages and resistance values? Is
it to get a specific voltage, current or what? How close do you have
to be or is it non-critical? What difference does it make? Where
can one find information?

Thanks all from an old timer who is still trying to get up to date
from the dynamic and crystal mikes of the 60s and 70s.

David K0LUM
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Don Wilhelm-4

Re: bias for Yamaha CM-500

David,

It is not critical. Look at the reflector post by Jim Brown in the last
couple days - I received it 01/15/2010 at 12:06 Eastern time. Jim is
quite familiar with the microphone and explains it much better than I can.

73,
Don W3FPR

David Christ wrote:

> I'm trying to understand the bias requirements for the CM-500
> specifically and electret/condenser (which is it) mikes in general.
>
> Yamaha's adaptor uses 3V (2 AAA batteries) in series with a 2.2K
> resistor and a 1 microfarad DC blocking capacitor. I would rather
> not depend on batteries. My reading of the KSB2 manual says to use
> 10K fed from 5V while I have heard that it should be 10K for this
> unit. I am not sure what my K3 is supplies. I would also like to use
> the mike with a Kenwood TS-940. That rig has 8V available at the
> mike connector. So if I build an adaptor to use with that rig what
> is the proper value resistor to use? Or should I build a quickie 3V
> regulator fed from the 8V and then use a 2.2K resistor? I presume I
> would need some value of DC blocking capacitor for the Kenwood.
>
> How does one determine the proper voltages and resistance values? Is
> it to get a specific voltage, current or what? How close do you have
> to be or is it non-critical? What difference does it make? Where
> can one find information?
>
> Thanks all from an old timer who is still trying to get up to date
> from the dynamic and crystal mikes of the 60s and 70s.
>
> David K0LUM
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
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> Please help support this email list: http://www.qsl.net/donate.html
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AD4C2009

Re: bias for Yamaha CM-500

I have my CM-500 that arrived yesterday directly to the radio rear mic input and the BIAS enabled at "rP.L bIAS" and it works great.Don't know how many volts the K3 produce in that setting but the headphone set works very good.

AD4C

"For a refined ham it is compulsory to own a k3"

--- On Sun, 1/17/10, Don Wilhelm <[hidden email]> wrote:

From: Don Wilhelm <[hidden email]>
Subject: Re: [Elecraft] bias for Yamaha CM-500
To: "David Christ" <[hidden email]>
Cc: [hidden email]
Date: Sunday, January 17, 2010, 1:11 PM

David,

It is not critical. Look at the reflector post by Jim Brown in the last
couple days - I received it 01/15/2010 at 12:06 Eastern time. Jim is
quite familiar with the microphone and explains it much better than I can.

73,
Don W3FPR

David Christ wrote:

Jim Brown-10

Re: bias for Yamaha CM-500

In reply to this post by David Christ

On Sat, 16 Jan 2010 23:20:27 -0600, David Christ wrote:

>I'm trying to understand the bias requirements for the CM-500
>specifically and electret/condenser (which is it) mikes in general.

Go back and read the post I made two days ago on this topic. It
tells you EXACTLY what to do. In short, tip to mic input, ring to 8V
through a resistor in the 5K to 10K range. If you want to know more,
see http://audiosystemsgroup.com/HamInterfacing.pdf

and the tutorial on audio in an appendix of

http://audiosystemsgroup.com/RFI-Ham.pdf

73,

Jim K9YC

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Merv Schweigert

Ask a favor

Wonder if I could ask a favor of someone on the list,
I am installing the upgrade DSP board today and would
like to do the IF output mod. the Extreme signal mod,
and the VFO noise mod.

Does anyone have these PDF downloaded and they
can send them to me in an attachment? I have tried
several times to download them and get the error that
the files are damaged and cannot be repaired, I suspect
my Adobe is too old, and my other PDF reader does
not seem to read them either.
I am on 28.8 dial up so cannot load a new Adobe etc.
Appreciate any help.. thanks.. 73 Merv KH7C
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Merv Schweigert

Re: [Elecraft] bias for Yamaha CM-500

In reply to this post by Jim Brown-10

Gentleman many thanks for sending the PDFs works just fine
on my reader, so can continue with the upgrades.
thanks again to all .. 73 Merv KH7C

Wonder if I could ask a favor of someone on the list, I am installing
the upgrade DSP board today and would
like to do the IF output mod. the Extreme signal mod,
and the VFO noise mod.
Does anyone have these PDF downloaded and they
can send them to me in an attachment? I have tried
several times to download them and get the error that
the files are damaged and cannot be repaired, I suspect
my Adobe is too old, and my other PDF reader does
not seem to read them either.
I am on 28.8 dial up so cannot load a new Adobe etc.
Appreciate any help.. thanks.. 73 Merv KH7C

______________________________________________________________
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