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OT (Yamaha Cm 500)

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Chris W7CTH

OT (Yamaha Cm 500)

Just got my CM 500 today. Would someone please tell me what the black box with 2AAA batteries is for.
Plus how do you like the mic on the cm500? I can't see it being as good as the Heil GM-5.

Comments please.
Chris W7CTH

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Dick Dievendorff

Re: OT (Yamaha Cm 500)

It's a microphone bias supply. If your audio equipment provides bias (the K3
can), then you can plug the microphone in directly. If the equipment
doesn't have the ability to provide bias voltage, the battery pack will.

Dick, K6KR

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of Chris Hembree
Sent: Monday, November 15, 2010 7:36 PM
To: [hidden email]
Subject: [Elecraft] OT (Yamaha Cm 500)

Just got my CM 500 today. Would someone please tell me what the black box
with 2AAA batteries is for.
Plus how do you like the mic on the cm500? I can't see it being as good as
the Heil GM-5.

Comments please.
Chris W7CTH

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Jim Brown-10

Re: OT (Yamaha Cm 500)

In reply to this post by Chris W7CTH

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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Joe Subich, W4TV-4

Re: OT (Yamaha Cm 500)

>> 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
> ______________________________________________________________
> 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
>

Alan Bloom

Re: OT (Yamaha Cm 500)

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
> > ______________________________________________________________
> > 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
> >
> ______________________________________________________________
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> Post: mailto:[hidden email]
>
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Joe Subich, W4TV-4

Re: OT (Yamaha Cm 500)

> 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
>>> ______________________________________________________________
>>> 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
>>>
>> ______________________________________________________________
>> 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
>
>
>

Jim Brown-10

Re: OT (Yamaha Cm 500)

On 11/16/2010 10:19 PM, Joe Subich, W4TV wrote:

> > 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.

Joe,

Yes, I agree that Alan is doing way too much cut on the low end.

I meant to respond earlier to your recommendation of high boost. I've
helped a LOT of K3 users adjust their TX audio using a CM500, and I've
NEVER heard a CM500 that needed ANY boost EQ. I've also gotten a lot of
very positive reports on my CM500s (I own two) and I've never used any
boost.

So I started thinking about why you might like boost -- after all,
you're a pretty sharp engineer. I can only come up with three scenarios
where you might prefer that. The first scenario is IF bandwidth on the
listening station. I always listen to the other station with my IF
bandwidth at about 2.7 - 3 kHz, because I don't want what MY RX is doing
to color my judgment of what the other guy is transmitting. So I get him
sounding good that way, and THEN I narrow up my IF to 1.8 kHz and listen
again.

IF you listen at 1.8 kHz bandwidth with the high end of the IF cutting
around 2.4 kHz or below, you certainly ARE going to want a bit of boost
on the high end, because the RX IF is rolling it off.. But if you center
that IF a bit higher, you won't want that HF boost.

The second scenario is that since CM500s are pretty inexpensive
products, there may be a fairly wide tolerance on the response of the
capsules. I've seen some anecdotal observations that suggest this might
be true. I DO believe, however, that the CM500s I own, and those I've
helped set up on the air, do NOT need HF boost.

The third scenario is hearing loss. We old farts have put a lot of
mileage on our ears, I know that I've got some hearing loss, and so do
many of my friends my age, especially those of us who work with audio or
radio professionally, or even as active hams. The nature of MOST
hearing loss is that we lose the high end first, so we want more high
end boost. I find that I need to do that with many news magazine and
interview programs that have poorly produced audio. I find it
professionally disgusting that the technicians who produce these
programs have the balls to call themselves engineers when they obviously
don't know what an equalizer is for or when to use it. But don't get me
started. :)

The reason I'm going through this is that I hear so much badly distorted
audio and splatter during contests, and the LAST thing that we need is
HF boost to produce more of it when the mic is already providing that
boost, and the CM500s I've heard DO have that HF boost built in.

Also a response to Alan's suggestion of tuning for flat spectrum on the
display. IF, and ONLY IF, the spectrum display is providing a VERY FAST
and very reliable peak and hold response, that is a potentally useful
way to START. The problem is that most displays are averaging, and the
average power of human speech is greatest in the lower octaves, so an
averaging display should NOT look flat. But it is NEVER wise to depend
only on any form of spectral response display to set EQ. The final test
instrument must always be our ears and the grey matter between them.

73, Jim Brown K9YC
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k5oai

Re: OT (Yamaha Cm 500)

well I know this thread is getting to the 'beating a dead horse' stage,
but I had to reply to your comments on this.
When I set up my CM-500 I did it on the air,
using a local friend that has known me and my the sound of my voice,
for the last 15 years, why do I trust his settings?
his credits are,
that he is blind which enhances his sense of sound
and has run sound boards for many bands and other events,
so I tend to trust his setup.

Oh and of course the 1st thing we did was
open his bandwidth up as wide as possible (on his rig.

My settings were as follows:

Gain = 16 Comp = 21

50 Hz -16 dB
100 Hz -16 dB
200 Hz -4 dB
400 Hz +3 dB
800 Hz -3 dB
1.6 kHz +4 dB
2.4 kHz +2 dB
3.2 kHz +6 dB

interestingly, when I also went through this dance with a D-104
and the settings were almost identical.

I might also add I have a fairly low voice,
and I have COPD (emphysema) and don't drive a mike well.

I can use an amplified D-104 and have to close talk it (1-2")
and someone can walk into the room 6' away and speak,
and drive the mike harder than I can from 1 or 2 inches.

GB & 73
K5OAI
Sam Morgan

On 11/17/2010 1:00 AM, Jim Brown wrote:

> On 11/16/2010 10:19 PM, Joe Subich, W4TV wrote:
>> > 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.
>
> Joe,
>
> Yes, I agree that Alan is doing way too much cut on the low end.
>
> I meant to respond earlier to your recommendation of high boost. I've
> helped a LOT of K3 users adjust their TX audio using a CM500, and I've
> NEVER heard a CM500 that needed ANY boost EQ. I've also gotten a lot of
> very positive reports on my CM500s (I own two) and I've never used any
> boost.
>
> So I started thinking about why you might like boost -- after all,
> you're a pretty sharp engineer. I can only come up with three scenarios
> where you might prefer that. The first scenario is IF bandwidth on the
> listening station. I always listen to the other station with my IF
> bandwidth at about 2.7 - 3 kHz, because I don't want what MY RX is doing
> to color my judgment of what the other guy is transmitting. So I get him
> sounding good that way, and THEN I narrow up my IF to 1.8 kHz and listen
> again.
>
> IF you listen at 1.8 kHz bandwidth with the high end of the IF cutting
> around 2.4 kHz or below, you certainly ARE going to want a bit of boost
> on the high end, because the RX IF is rolling it off.. But if you center
> that IF a bit higher, you won't want that HF boost.
>
> The second scenario is that since CM500s are pretty inexpensive
> products, there may be a fairly wide tolerance on the response of the
> capsules. I've seen some anecdotal observations that suggest this might
> be true. I DO believe, however, that the CM500s I own, and those I've
> helped set up on the air, do NOT need HF boost.
>
> The third scenario is hearing loss. We old farts have put a lot of
> mileage on our ears, I know that I've got some hearing loss, and so do
> many of my friends my age, especially those of us who work with audio or
> radio professionally, or even as active hams. The nature of MOST
> hearing loss is that we lose the high end first, so we want more high
> end boost. I find that I need to do that with many news magazine and
> interview programs that have poorly produced audio. I find it
> professionally disgusting that the technicians who produce these
> programs have the balls to call themselves engineers when they obviously
> don't know what an equalizer is for or when to use it. But don't get me
> started. :)
>
> The reason I'm going through this is that I hear so much badly distorted
> audio and splatter during contests, and the LAST thing that we need is
> HF boost to produce more of it when the mic is already providing that
> boost, and the CM500s I've heard DO have that HF boost built in.
>

AD4C2009

Re: OT (Yamaha Cm 500)

In reply to this post by Joe Subich, W4TV-4

With all your respect AL but with those settings you are making a "condensed milk can" sound,I mean extremenly high pitch and very difficult for others to hear you.
Joe is right,you need some lows and more highs,for your reference this is how I set my CM-500 for dx work:
50, 100,and 200 Hz all them down to -16db
400 and 800 Hz at cero
1600 at +3db
2400 at +6db
3200 at +9 db
And Joe is right,you need to hear yourself in another radio or get somebody you trust who had good ear and of course good radio to help you out.In my case everytime I do a change in my settings I monitor myself in my backup radio,the TS-590S.

Hector
AD4C
K3 # 2192

"If you see a driver handling a cell phone on her/his hands while driving,do please stay away from that vehicle,its a moving bomb.Your life is at danger.Keep yourself and your family alive"

--- On Wed, 11/17/10, Joe Subich, W4TV <[hidden email]> wrote:

From: Joe Subich, W4TV <[hidden email]>
Subject: Re: [Elecraft] OT (Yamaha Cm 500)
To: [hidden email]
Cc: [hidden email]
Date: Wednesday, November 17, 2010, 6:19 AM

> 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:

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n7ws

OT Was Yamaha CM500

In reply to this post by Jim Brown-10

Food for thought.

As is (too) often the case, I find some of these discussion amusing.

One guy asks, "What settings should I use for X?" and a dozen guys pop up with "the" answer, as if one size fits all.

In this case, everyone's voice is different, there has to be some variability in a low cost, mass-produced headset, the microphone to mouth distance will be different for different ops and so on and so forth.

I am, if not the first, certainly one of the first, to use and bring the CM500 to the attention of this group. But it is not magic and there are no magic adjustments that suit everyone.

I have never had a broadcaster's voice and as I age, this only gets worse. Extreme cuts in bass response are counter productive for me.

To make adjustments in the equalizer/compression, etc. probably the best one can do without a room full of test equipment is to record yourself via the monitor and listen to the played back audio with a good set of 'phones. If you want a revelation, be sure to use the new "fast monitor" to see how the microphone really sounds before any processing.

Another amusement is one guy saying, "I cut the lows and leave the highs flat" and another guy says, "I leave the lows flat and boost the highs" and they think there is a different result, when all they really did was move the same frequency response up and down an amplitude scale.

Wes Stewart, N7WS

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Alan Bloom

Re: OT (Yamaha Cm 500)

In reply to this post by Jim Brown-10

Thanks guys.

> Yes, I agree that Alan is doing way too much cut on the low end.

I should have mentioned that the microphone is a computer-type headset
with a boom mic, which probably has no frequency shaping at all. Plus I
have a rather deep voice so, between those two factors, I no doubt need
more bass suppression than most.

> Also a response to Alan's suggestion of tuning for flat spectrum on the
> display. IF, and ONLY IF, the spectrum display is providing a VERY FAST
> and very reliable peak and hold response, that is a potentally useful
> way to START. The problem is that most displays are averaging,

I was using the peak mode on the P3 with averaging turned off. The peak
is basically instantaneous, limited only by the bandpass filter in front
of the FFT, about 4 kHz (+/- 2 kHz from the RF center frequency) at the
narrowest spans. The hold time is infinite until you manually reset it.

> But it is NEVER wise to depend
> only on any form of spectral response display to set EQ. The final test
> instrument must always be our ears and the grey matter between them.

I should use the K3's DVR to send a test signal and listen on my TR7.
The thing is, listening is so highly subjective that I figured that I'd
get better accuracy using a spectrum display.

Alan

On Tue, 2010-11-16 at 23:00 -0800, Jim Brown wrote:

> On 11/16/2010 10:19 PM, Joe Subich, W4TV wrote:
> > > 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.
>
> Joe,
>
> Yes, I agree that Alan is doing way too much cut on the low end.
>
> I meant to respond earlier to your recommendation of high boost. I've
> helped a LOT of K3 users adjust their TX audio using a CM500, and I've
> NEVER heard a CM500 that needed ANY boost EQ. I've also gotten a lot of
> very positive reports on my CM500s (I own two) and I've never used any
> boost.
>
> So I started thinking about why you might like boost -- after all,
> you're a pretty sharp engineer. I can only come up with three scenarios
> where you might prefer that. The first scenario is IF bandwidth on the
> listening station. I always listen to the other station with my IF
> bandwidth at about 2.7 - 3 kHz, because I don't want what MY RX is doing
> to color my judgment of what the other guy is transmitting. So I get him
> sounding good that way, and THEN I narrow up my IF to 1.8 kHz and listen
> again.
>
> IF you listen at 1.8 kHz bandwidth with the high end of the IF cutting
> around 2.4 kHz or below, you certainly ARE going to want a bit of boost
> on the high end, because the RX IF is rolling it off.. But if you center
> that IF a bit higher, you won't want that HF boost.
>
> The second scenario is that since CM500s are pretty inexpensive
> products, there may be a fairly wide tolerance on the response of the
> capsules. I've seen some anecdotal observations that suggest this might
> be true. I DO believe, however, that the CM500s I own, and those I've
> helped set up on the air, do NOT need HF boost.
>
> The third scenario is hearing loss. We old farts have put a lot of
> mileage on our ears, I know that I've got some hearing loss, and so do
> many of my friends my age, especially those of us who work with audio or
> radio professionally, or even as active hams. The nature of MOST
> hearing loss is that we lose the high end first, so we want more high
> end boost. I find that I need to do that with many news magazine and
> interview programs that have poorly produced audio. I find it
> professionally disgusting that the technicians who produce these
> programs have the balls to call themselves engineers when they obviously
> don't know what an equalizer is for or when to use it. But don't get me
> started. :)
>
> The reason I'm going through this is that I hear so much badly distorted
> audio and splatter during contests, and the LAST thing that we need is
> HF boost to produce more of it when the mic is already providing that
> boost, and the CM500s I've heard DO have that HF boost built in.
>
> Also a response to Alan's suggestion of tuning for flat spectrum on the
> display. IF, and ONLY IF, the spectrum display is providing a VERY FAST
> and very reliable peak and hold response, that is a potentally useful
> way to START. The problem is that most displays are averaging, and the
> average power of human speech is greatest in the lower octaves, so an
> averaging display should NOT look flat. But it is NEVER wise to depend
> only on any form of spectral response display to set EQ. The final test
> instrument must always be our ears and the grey matter between them.
>
> 73, Jim Brown K9YC
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AC7AC

Re: OT (Yamaha Cm 500)

CONTENTS DELETED

The author has deleted this message.

Jim Brown-10

Re: OT (Yamaha Cm 500)

In reply to this post by Alan Bloom

On 11/17/2010 10:43 AM, Alan Bloom wrote:
> I was using the peak mode on the P3 with averaging turned off. The peak
> is basically instantaneous, limited only by the bandpass filter in front
> of the FFT, about 4 kHz (+/- 2 kHz from the RF center frequency) at the
> narrowest spans. The hold time is infinite until you manually reset it.

Peak hold, accumulating peaks for a long time with no averaging would be
the best test setup, then listen wideband.

73, Jim K9YC.
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