I conclude that the VOICEMAX issue has died, has had the funeral and now should
be buried.

Those who advocate high distortion levels and poor quality signals can spend
their $$$ and buy it.

Those who prefer low distortion and clean sounding signals won't.

Let the trip to the cemetery begin.

/s/ Deek

AUUDDIIOOO wrote:

"john lyon" wrote in message
...

"Radioisfun" wrote in message
...

IDIOT!

"Telstar Electronics" wrote in message
groups.com...


We know, it has been ripped apart on this newsgroup a few times. It's not
a good product. If fitted without using the correct alignment procedures
and test equipment it will ruin performance and cause splattering over the
bands and generate harmonics. Not many people who have the "really loud =
really far" mentality will know how to use test equipment, they tend to be
the ones with a lack of knowledge. Maybe the type who believe polishing
the aerial will lower the VSWR!
The circuit has no RF filtering for a start, it is not screened in any
way, it has a light that you will never see once the radio is put back
together and it will have no benefit over the microphone that was designed
to operate with the radio. It will cause distortion and harmonics unless
the radio is realigned using test gear. If you use that on AM/SSB you
will sound terrible, it is a waste of time. There is no way that the
circuit differentiates between a voice and background noises, so raising
the level many times and keeping it at 100% will mean that the sound will
just be a "noise". Compare that to a normal mic, audio nearer to it such
as the operator voice will be louder than what is in the background.
The product is out of date, has no market and probably would have been
better 20+ years ago.

I certainly wouldn't recommend it, from a radio engineers point of view.





Just like so called Engineers, your a dumb ass John.
Your are an Engineer? What a Trash truck radio Engineer?

There is a noise gate built in. Read his Good web site.
Just wondered on what happened to the Power amp He had.

On Sep 19, 12:42 pm, Deek wrote:
I conclude that the VOICEMAX issue has died, has had the funeral and now should
be buried.
Those who advocate high distortion levels and poor quality signals can spend
their $$$ and buy it.
Those who prefer low distortion and clean sounding signals won't.
Let the trip to the cemetery begin.

Thanks for your conclusion. Maybe you should contact the engineers at
Analog Devices and explain to them that their SSM2166 chip is just
plain no good. I'm sure they'd be happy to hear from you... lol
www.telstar-electonics.com

Telstar Electronics wrote:

On Sep 19, 12:42 pm, Deek wrote:

I conclude that the VOICEMAX issue has died, has had the funeral and now should
be buried.
Those who advocate high distortion levels and poor quality signals can spend
their $$$ and buy it.
Those who prefer low distortion and clean sounding signals won't.
Let the trip to the cemetery begin.


Thanks for your conclusion. Maybe you should contact the engineers at
Analog Devices and explain to them that their SSM2166 chip is just
plain no good. I'm sure they'd be happy to hear from you... lol
www.telstar-electonics.com


I'm sure they will acknowledge that it introduces controlled distortion.

On Sep 19, 12:58 pm, Deek wrote:
I'm sure they will acknowledge that it introduces controlled distortion.

I'm surprised at you... being a chief engineer and all... you should
realize that in this audio application we're talking strictly about
harmonic distortion. After all, that's what you can hear. In the
Analog Devices datasheet (page2)... this is given for the SSM2166 as
"Total Harmonic Distortion including internal chip noise" of typical
0.25%... and a maximum of 0.5%. These figures rival the finest audio
equipment!
www.telstar-electronics.com

Distortion is more than harmonic distortion.

If any output does not replicate the input in amplitude and frequency response,
there is distortion ... period!

If a 1 Vp-p pure sine wave swept between 300 Hz and 3000 Hz goes into a device
and produces an output of 2 Vp-p pure sine wave between 300 Hz and 3000 Hz there
is a uniform gain of 2 and NO distortion.

If a 1 Vp-p pure sine wave swept between 300 Hz and 3000 Hz produces 2 Vp-p at
300 Hz, then rises to 2.5 Vp-p at 1000 Hz and further rises to 2.8 Vp-p at 3000
Hz, the signal is distorted! The output is NOT a constant multiplier of the input.

Run the test I posted. Or run it against a spectrum analyzer. Or, simply admit
the output does not replicate the input. Lack of replication, in amplitude,
frequency response or internal non-linearity, is distortion.

A-D is specifying harmonic distortion ONLY.

Speech compression is the deliberate introduction of distortion [to provide some
desired result]

In the recording industry, when analog recording was the norm, the recording
studio distorted the recorded signal by the addition of 'pre-emphasis'. That is
shaping the frequency response to compensate for known frequency variations in
the recording media. The playback electronics may have had 'de-emphasis',
depending upon recording media, to remove the effects of pre-emphasis and media
distortion so that the output replicated the input. That is controlled
distortion to achieve a desired result.

Speech compression in radio-telephony is intentional distortion to achieve a
perceived desired result.

In mathematical terms TD = THD + dA/dF + dA/dT + dA/dV + d(Af(F))/dF ... should
I continue?

TD = Total distortion
THD = Total Harmonic Distortion
dA/dF = Intentional Amplitude variation as a function of frequency
dA/dT = Amplitude variation as a function of temperature
dA/dV = Amplitude variation as a function of bias voltage [AKA common mode, bias
effects]
d(Af(F))/df = Amplitude and gain variations as a function of gain roll off of
the active device [a function of device gain rolloff [AKA gain*bandwidth product]].

I can add some more terms if you like.

As a Chief Engineer I know and understand exactly what I am stating.

A speech compression circuit deliberately produces a dA/dF, a variation in gain
as a function of frequency, to achieve an intended result. It is distortion!

As a company advertising and marketing a device, you should be precise in your
language or define your terms explicitly.

As far as I'm concerned this topic is dead, the funeral has been held, and the
grave has been covered. I have no need to defend myself.

Deek




Telstar Electronics wrote:

On Sep 19, 12:58 pm, Deek wrote:

I'm sure they will acknowledge that it introduces controlled distortion.


I'm surprised at you... being a chief engineer and all... you should
realize that in this audio application we're talking strictly about
harmonic distortion. After all, that's what you can hear. In the
Analog Devices datasheet (page2)... this is given for the SSM2166 as
"Total Harmonic Distortion including internal chip noise" of typical
0.25%... and a maximum of 0.5%. These figures rival the finest audio
equipment!
www.telstar-electronics.com

Deek wrote:
Telstar Electronics wrote:

On Sep 19, 12:42 pm, Deek wrote:

I conclude that the VOICEMAX issue has died, has had the funeral and
now should
be buried.
Those who advocate high distortion levels and poor quality signals
can spend
their $$$ and buy it.
Those who prefer low distortion and clean sounding signals won't.
Let the trip to the cemetery begin.


Thanks for your conclusion. Maybe you should contact the engineers at
Analog Devices and explain to them that their SSM2166 chip is just
plain no good. I'm sure they'd be happy to hear from you... lol
www.telstar-electonics.com


I'm sure they will acknowledge that it introduces controlled distortion.
=====================================
Which for radio voice comms does not matter all that much.

Frank GM0CSZ / KN6WH

On Sep 19, 11:42 am, Deek wrote:
I conclude that the VOICEMAX issue has died, has had the funeral and now should
be buried.

Those who advocate high distortion levels and poor quality signals can spend
their $$$ and buy it.

That's just what the average cber wants. Makes em think they got a
"BIG RADIO".

cmdr buzz corey wrote:

...
That's just what the average cber wants. Makes em think they got a
"BIG RADIO".


Well, that is certainly better than a "Big-Headed-Amateur-Wannabe!"

Get mental help, the opportunity is still open to 'ya!

JS