VoiceMax speech processor is not for everyone...
It's only for radio operators that want maximum range from their rig.
VoiceMax is no gimmick... it uses proven AGC technology to produce
tangible results. Want to know more?
http://tinyurl.com/2ac9r5

P.S.
Stop by Ebay and see what others have said about this revolutionary
new product.
http://tinyurl.com/2q9lpu

"Telstar Electronics" wrote...
VoiceMax speech processor is not for everyone...

For example:

1. It is not for those using FM CB
FM CB requires more bandwidth than AM. Using speech
processors on FM CB only distorts and knocks out other
channels.

2. It is not for those in Europe
It does not meet the RoHS legal requirements, making it
illegal to place on the EU market.

3. It is not for use in UK CB radios.
UK CB rules state a maximum average deviation. As a
processor raises the average deviation, it can make a
UK CB illegal to own or use.
(RoHS rules also make it illegal in UK).

4. It may not be for use in American CB radios.
Modifying a CB radio may make it illegal.


So, what is left?
Does it make a good doorstop?


Regards,
Peter.

On Sat, 27 Oct 2007 05:31:33 +0100, " Peter"
wrote:

|So, what is left?
|Does it make a good doorstop?
|-------------

To small for an effective doorstop.

james

VoiceMax speech processor is not for everyone...
It's only for radio operators that want maximum range from their rig.
VoiceMax is no gimmick... it uses proven AGC technology to produce
tangible results. Want to know more?
http://tinyurl.com/2ac9r5

P.S.
Stop by Ebay and see what others have said about this revolutionary
new product.
http://tinyurl.com/2q9lpu

"james" wrote...
" Peter" wrote:

|So, what is left?
|Does it make a good doorstop?
|-------------

To small for an effective doorstop.

We have small doors here in the UK.


Regards,
Peter.

"Willey" wrote...

" Peter" wrote...

1. It is not for those using FM CB
FM CB requires more bandwidth than AM. Using speech
processors on FM CB only distorts and knocks out other
channels.

Wrong, what an idiot, using compression does not increase
deviation on FM an modulation

The whole point of the speech processor is to increase the
average modulation (or deviation with FM).
You really need to read up on the subject, consider ALL the
facts...

First of all, consider the UK FM CB legal limits:
RF power output: 4 Watts.
Deviation ("27/81" standard): 2.5KHz.
Deviation (new sets): 2KHz.
Audio bandwidth: 3KHz
Adjacent channel power: 20 microwatts.

You will find that, at 2KHz deviation, the bandwidth of the
transmitted signal goes into the adjacent channel bandwidth.
But this is only on the peaks, which should be only a small part
of the overall signal.
As long as any encroachment on adjacent channels is only on
the peaks, with the average being kept low, users will not
notice it.

A speech processor will increase the average deviation, increasing
the average adjacent channel power. This can cause serious
adjacent channel problems, and take the radio outside of that
20 microWatt limit.
Here in the UK, we have had over 25 years of FM CB and plenty
of distortion and splatter caused by speech processors and
power microphones.

There are also cases where adding a processor makes no
perceived improvement to the audio at the other end, but it sure
as hell starts wiping out adjacent channels. There are some
UK FM CBs which will not sound loud no matter how much
you boost or compress the audio. Some can wipe out two
channels each way, and still sound quiet.

People who have been sold a processor as a cure to these issues,
without anyone looking at why the radio *sounds* quiet, have
been very disappointed when they still had "quiet" audio, but
now a lighter wallet.
But the problem could have been fixed for pennies, without
increasing or compressing the audio.


limiter limits

You have to consider that the processor has no concept
of what 100% modulation or 2KHz deviation are. The exact
level will depend totally upon what the user sets it at inside
the radio. Unless they have the (properly calibrated) equipment
and the knowledge, then that limit could be be overmodulating
or overdeviating.

the Audio MAX.

My power supply is 7Amp maximum, should I run it at that
constantly? How about my CB, which takes 1.6 Amp, should
I use a 1.6A fuse?
Of course not; maximum is exactly that, maximum at peaks.


Fitting an FM CB signal within the 10KHz spacing of CB only
works with a low peak AND average. Increase the average
deviation, and all bets are off.

The changes in our CB standards were made after years of trouble.
Every second channel was unusable, we were down to a maximum
of 20 usable channels.
So the standards were changed; maximum deviation was reduced,
average adjacent channel power was stated and receiver adjacent
channel rejection was set at 60dB minimum.
And, just to make sure, UK CBs had to be submitted for testing
before they could be offered for sale (manufacturers were
no longer trusted).


3. It is not for use in UK CB radios.
UK CB rules state a maximum average deviation. As a
processor raises the average deviation, it can make a
UK CB illegal to own or use.
(RoHS rules also make it illegal in UK).

Again a compressor does not change the deviation, the limiter or
clipper in the radio prevents the over deviation.

The UK FM legal requirements set maximum peak and average figures.
BOTH requirements must be met, or the radio no longer conforms
to the required specification.
Increasing the AVERAGE deviation may take the radio beyond the
legal requirements for use within the Citizens' Band. This makes
the radio open to seizure, and the user open to prosecution.
If people want to risk losing their equipment and getting an
on-the-spot fine (as the DTI have decided should now be done),
that is their choice. But they should at least be aware of the facts.


Regards,
Peter.

VoiceMax speech processor is not for everyone...
It's only for radio operators that want maximum range from their rig.
VoiceMax is no gimmick... it uses proven AGC technology to produce
tangible results. Want to know more?
http://tinyurl.com/2ac9r5

P.S.
Stop by Ebay and see what others have said about this revolutionary
new product.
http://tinyurl.com/2q9lpu

On Sun, 28 Oct 2007 05:53:36 -0700, Telstar Electronics
wrote:

|VoiceMax speech processor is not for everyone...
|
|--------------------

Truer words have never been so well stated!

james

Something else that I should have mentioned, as it seems to be
overlooked too often...

"Willey" wrote...

using compression does not increase deviation on
FM an modulation limiter limits the
Audio MAX.

A compressor does NOT limit output to a set level.
What it does is attempt to keep the output at a preset amplitude,
by noticing when it is above or below that level and then starting
to compensate.

Do you see the implications of the above?
The output DOES exceed the preset level, until the system has
realized and compensated for it.

The *peak* deviation is that due to the maximum output
before the level is reduced again, not that of the preset level.

As standard, an FM CB is set so that it peaks at 2KHz absolute
maximum.
If you fit a processor, and adjust for 2KHz deviation, that will
be set for 2KHz when the AGC has corrected the level. Every time
your audio level increases (it is continually changing), the deviation
can hit several times that 2KHz requirement until the AGC has
corrected for the increase.
Totally illegal, and a serious cause of distortion and adjacent
channel interference.


Again a compressor does not change the deviation,


Incorrect.
See above and the other reply. There would be no point to
the circuit if it did not change the deviation in any way.


the limiter or clipper in
the radio prevents the over deviation.

Incorrect.
A manufacturer is free to fit a clipping circuit, if they
wish to - but it is by no means certain that they have.
Even radios from the same manufacturer, or with the
same model number, may use different circuits.
The list below is not a complete list of UK and EU FM CBs,
just a few where I quickly looked at the circuits...

Some use absolutely no clipping or AGC:
Amstrad 900 & 901, Binatone Breaker-phone,
Mustang 1000 & 2000, Spinneytronic.

Some use basic diode clipping, parallel diodes to
ground:
Fidelity 3000, Lowe TX-40.

Some use clipping with two diodes in series (Like
in Lou Franklin's clipping processor):
DNT B40,
Midland 77-104D, 77-104 (CEPT),
Team Lancaster,
Uniden UK CBs.

Some use an op-amp setup similar to the
K-40 processor circuit:
Colt 295, Maxcom 20E,
Magpie Autoscan,
Maxon MX-1000 & MX-2000,
Midland 4001, 77-104 (UK), 77-805.

Some use AGC systems:
Alpha 4000, Binatone Route 66,
Jesan KT 4004 / 5005 / 7007,
Midland 77-099, 77-250K,
Pama GX19 / 25 / 29 / 1000 / 2000.
Shogun (UK CB, not Emperor).


Now for the big question... if the radio does have some form
of processor (clipping or AGC), why the hell would you wish
to spend money putting another one in?


If the radio has no level control, the VoiceMax will be allowed
to take peaks well over the 2KHz deviation - distorting the
received audio and knocking out channels.
If the radio has clipping, then this comes into play and causes
distortion - the exact type of distortion that Griffter claims
will not happen with his product.
If the radio has AGC, then the excessive peaks from The SplatterMax
will still pass straight through... and why fit another AGC circuit
when it already has one?

Oh, and don't forget that the VoiceMax instructions* say that, if a
limiter is fighting your attempts and keep the radio within the
required limits, just disable the limiter.



Regards,
Peter.

* VoiceMax instructions:
Revision B dated 7/8/2007 7:23pm

On Thu, 1 Nov 2007 05:09:17 -0000, " Peter"
wrote:

|A compressor does NOT limit output to a set level.
|What it does is attempt to keep the output at a preset amplitude,
|by noticing when it is above or below that level and then starting
|to compensate.
|------------

Wrong

A compressor essentially works by reducing the gain of a controlled
stage after an input threshold has been reached. As the input
increases beyond that threshold the gain of the stage is reduced until
it approaches unity gain. In that aspect a limit is reached.

When using high compression ratios, the compressor will act as a
limiter.

james