On Wed, 08 Aug 2007 16:27:19 -0700, Telstar Electronics
wrote:

|On Aug 8, 5:19 pm, james wrote:
| The board is not fully shielded. From the pictures I see components on
| one side. If it were fully shielded then I should not see conponents
| but some form of shielding.
| james
|
|What are you talking about?
|The components are all under a metal shield...
|The picture you see with all the components is before the shield goes
|on.
|I see you're still as sharp as a tack... lol
|Now get your glasses this time and look again...
|http://www.telstar-electronics.com/VoiceMax%20B.pdf
|www.telstar-electronics.com
|
|------------------------

besides a well designed PCB layout and proper care in design can quite
often remove the need for shielding.

james

On Aug 9, 8:43 am, james wrote:
besides a well designed PCB layout and proper care in design can quite
often remove the need for shielding.

When you have an amplifier with 60dB of gain... and high local RF
fields... all the design and PCB layout work in the world will not
help you from instabilities... without a shield!
www.telstar-electronics.com

The main problem I see with the voicemax is that it is a fast response,
short hold time audio compressor.
CBers like their audio clipped off on their peaks so they can sound LOUD and
like ****. The more screwed up the audio is the better they like it

Now if the compressor was followed by a clipper with some clipping on the
peaks, followed by a low pass filter, it could sound LOUD without splitter.

I forgot CBers like to splitter across the band so their buddies on the
band can hear them no matter what channel their on.

like ****.

Capitalized for emphasis? :lol:

I know of two hams that have their audio cranked up so loud on
2 meter FM, that when you turn them down to a normal level, you
can't hear the reply from a normal user.

On Aug 12, 11:40 pm, Scott in Baltimore
wrote:
like ****.
Capitalized for emphasis? :lol:
I know of two hams that have their audio cranked up so loud on
2 meter FM, that when you turn them down to a normal level, you
can't hear the reply from a normal user.

True, sounding bad is not exclusive to CBers... LOL
What do you mean normal level? 50% modualtion?, 70%?, 85%?
What is the modulation of a "normal user"?
www.telstar-electronics.com

On Aug 12, 10:55 pm, "Big Joe" wrote:
The main problem I see with the voicemax is that it is a fast response,
short hold time audio compressor.
CBers like their audio clipped off on their peaks so they can sound LOUD and
like ****. The more screwed up the audio is the better they like it
Now if the compressor was followed by a clipper with some clipping on the
peaks, followed by a low pass filter, it could sound LOUD without splitter.
I forgot CBers like to splitter across the band so their buddies on the
band can hear them no matter what channel their on.

You're right... CBers as a rule sound bad. I don't think they do this
on purpose... although you'd never know that by the way they carry-
on... LOL
You're also right that a clipping type compressor makes you sound very
distorted... and should not be used for voice applications.
After all... clipping type compressors are most commonly used as an
accessory for electric guitars... where they are commonly referred to
as "fuzz boxes".
www.telstar-electronics.com

IDIOT!
"Telstar Electronics" wrote in message
oups.com...

On Thu, 09 Aug 2007 08:25:22 -0700, Telstar Electronics
wrote:

|On Aug 9, 8:43 am, james wrote:
| besides a well designed PCB layout and proper care in design can quite
| often remove the need for shielding.
|
|When you have an amplifier with 60dB of gain... and high local RF
|fields... all the design and PCB layout work in the world will not
|help you from instabilities... without a shield!
|www.telstar-electronics.com
|---------------

If there is instabilities that often is the results of to much gain in
one stage. A m ore prudent design would be to spread the gain over
several stages to reduce instabilities of a single stage.

Also proper RF by passing and PCB layout can minimize stray pickup of
weak RF fields.

james

Why Do You Need a Speech Processor for Your CB Radio?
Two-way radio communication relies on the modulation contained within
the signal. Maintaining a high modulation level is crucial in
providing the highest possible efficiency from any transmitter
operating on AM, FM, or SSB modes. Two-way radios also rely on
microphones that inherently change audio levels delivered to the
transmitter. This causes transmitter modulation to fluctuate greatly
depending on voice level and pitch. The average modulation of a
typical voice signal is only about 40%. This low percentage applied
to
the transmitter, results in less than optimal transmission range.

Other Processors Have a Problem...
Other speech processors use a low-cost "audio clipping" approach to
achieve compression. While this method is economical for the
manufacturer, clipping distorts the original signal and sounds fuzzy
on the air. What these types of audio processors gain in volume, they
lose in voice intelligibility.


VoiceMax is Different...
VoiceMax uses a sophisticated AGC (Automatic Gain Control) circuit
that installs inside your transceiver to hold the audio level
constant, with less than 1% harmonic distortion. No "clipping" type
processor can come close to this low distortion level. Whether you're
whispering or shouting, VoiceMax holds your transceiver at 100%
modulation allowing you to punch through heavy channel traffic
without
sacrificing voice clarity. VoiceMax incorporates a feature not
offered
on other processors. The adjustable noise gate allows the user to
block unwanted ambient background sounds. This feature is especially
helpful in mobile environments where wind and road noise can be an
issue. VoiceMax works with your non-amplified dynamic microphone to
give you tremendous audio punch without all the background noise
associated with power microphones.


www.telstar-electronics.com

Why Do You Need a Speech Processor for Your CB Radio?
Two-way radio communication relies on the modulation contained within
the signal. Maintaining a high modulation level is crucial in
providing the highest possible efficiency from any transmitter
operating on AM, FM, or SSB modes. Two-way radios also rely on
microphones that inherently change audio levels delivered to the
transmitter. This causes transmitter modulation to fluctuate greatly
depending on voice level and pitch. The average modulation of a
typical voice signal is only about 40%. This low percentage applied
to
the transmitter, results in less than optimal transmission range.

Other Processors Have a Problem...
Other speech processors use a low-cost "audio clipping" approach to
achieve compression. While this method is economical for the
manufacturer, clipping distorts the original signal and sounds fuzzy
on the air. What these types of audio processors gain in volume, they
lose in voice intelligibility.


VoiceMax is Different...
VoiceMax uses a sophisticated AGC (Automatic Gain Control) circuit
that installs inside your transceiver to hold the audio level
constant, with less than 1% harmonic distortion. No "clipping" type
processor can come close to this low distortion level. Whether you're
whispering or shouting, VoiceMax holds your transceiver at 100%
modulation allowing you to punch through heavy channel traffic
without
sacrificing voice clarity. VoiceMax incorporates a feature not
offered
on other processors. The adjustable noise gate allows the user to
block unwanted ambient background sounds. This feature is especially
helpful in mobile environments where wind and road noise can be an
issue. VoiceMax works with your non-amplified dynamic microphone to
give you tremendous audio punch without all the background noise
associated with power microphones.


www.telstar-electronics.com