Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss

Re: VoiceMax Speech Processor...

83 views
Skip to first unread message
Message has been deleted

Tio Pedro

unread,
Jun 5, 2008, 4:25:44 PM6/5/08
to

"Telstar Electronics" <briang...@sbcglobal.net> wrote in message
news:c58546f7-aa2a-40eb...@34g2000hsh.googlegroups.com...
> VoiceMax is really gaining momentum!
> Radio operators all over the world are enjoying the Voicemax
> advantage.
> Since VoiceMax doesn't use audio "clipping"... your audio is loud AND
> clear.
> What a concept!
>
> See what VoiceMax can do for you at
> http://www.telstar-electronics.com/voicemax.htm

What is the dB advantage of this vs. RF clipping for SSB?

cmdr buzz corey

unread,
Jun 6, 2008, 12:35:00 AM6/6/08
to
On Jun 5, 2:25 pm, "Tio Pedro" <radioconnect...@cox.net> wrote:
> "Telstar Electronics" <briangrif...@sbcglobal.net> wrote in message

It is a splatter box add-on.

Telstar Electronics

unread,
Jun 6, 2008, 12:33:32 PM6/6/08
to
On Jun 5, 3:25 pm, "Tio Pedro" <radioconnect...@cox.net> wrote:
> "Telstar Electronics" <briangrif...@sbcglobal.net> wrote in message

The compression ratio of VoiceMax is fixed at 15:1 with distortion
levels well below 1%.
I suggest you read this for clarification... http://en.wikipedia.org/wiki/Audio_level_compression

laura halliday

unread,
Jun 6, 2008, 4:47:26 PM6/6/08
to
On Jun 5, 4:26 am, Telstar Electronics <briangrif...@sbcglobal.net>
wrote:

> VoiceMax is really gaining momentum!
> Radio operators all over the world are enjoying the Voicemax
> advantage.
> Since VoiceMax doesn't use audio "clipping"... your audio is loud AND
> clear.
> What a concept!
>
> See what VoiceMax can do for you athttp://www.telstar-electronics.com/voicemax.htm

Here we go again!

Laura Halliday VE7LDH "Non sequitur. Your ACKS are
Grid: CN89mg uncoordinated."
ICBM: 49 16.05 N 122 56.92 W - Nomad the Network Engineer

james

unread,
Jun 6, 2008, 5:17:28 PM6/6/08
to

|----------------------

RF Clipping is superior to audio compression in SSB transmission. RF
clipping will provide about 6dB improvement over audio compression
alone.

james

Tio Pedro

unread,
Jun 6, 2008, 5:19:59 PM6/6/08
to

"james" <geo...@washington.edu> wrote in message
news:57aj44516jdqbjs8c...@4ax.com...

> |----------------------
>
> RF Clipping is superior to audio compression in SSB transmission. RF
> clipping will provide about 6dB improvement over audio compression
> alone.
>
> james

Rhetorical question :)


Telstar Electronics

unread,
Jun 9, 2008, 9:25:33 AM6/9/08
to
On Jun 6, 4:17 pm, james <geo...@washington.edu> wrote:
> On Thu, 5 Jun 2008 16:25:44 -0400, "Tio Pedro"
>
> <radioconnect...@cox.net> wrote:
>
> ||"Telstar Electronics" <briangrif...@sbcglobal.net> wrote in message

>
> |news:c58546f7-aa2a-40eb...@34g2000hsh.googlegroups.com...
> |> VoiceMax is really gaining momentum!
> |> Radio operators all over the world are enjoying the Voicemax
> |> advantage.
> |> Since VoiceMax doesn't use audio "clipping"... your audio is loud AND
> |> clear.
> |> What a concept!
> |>
> |> See what VoiceMax can do for you at
> |>http://www.telstar-electronics.com/voicemax.htm
> |
> |What is the dB advantage of this vs. RF clipping for SSB?
> |
> |
> |----------------------
>
> RF Clipping is superior to audio compression in SSB transmission. RF
> clipping will provide about 6dB improvement over audio compression
> alone.
>
> james

James is correct... that the RF clipping technique is somewhat more
effective. What he fails to mention is that it's more complex... and
not easily installed into an existing radio. RF clipping also
exihibits substantially more distortion. The VoiceMax installs
easily... and provides tangible results.

cmdr buzz corey

unread,
Jun 9, 2008, 7:53:50 PM6/9/08
to
On Jun 9, 7:25 am, Telstar Electronics <briangrif...@sbcglobal.net>
wrote:

> The VoiceMax installs
> easily... and provides tangible results.

Lots of splatter immediately upon installation.

Telstar Electronics

unread,
Jun 10, 2008, 7:54:07 AM6/10/08
to
On Jun 9, 6:53 pm, cmdr buzz corey <cmdr-buzz-co...@mailcity.com>
wrote:

Actually, if adjusted correctly... no splatter... and 100% constant
modulation.
www.telstar-electronics.com

james

unread,
Jun 11, 2008, 9:44:19 AM6/11/08
to

|----------------

Actually as easy to design an RF Clipper as an audio compressor. True
it is a bit more difficult to install. Audio clippers can be external
to the transmitter and simpler to install and operate. A RF Clipper
will install as easily as your internal audio compressor.

Personally I would take RF clipping over Audio compression any day
with SSB transmissions. If the post filters are good in enough RF
clipping, there is not significant difference in distortion.

james

Telstar Electronics

unread,
Jun 11, 2008, 4:36:55 PM6/11/08
to
On Jun 11, 8:44 am, james <geo...@washington.edu> wrote:
> On Mon, 9 Jun 2008 06:25:33 -0700 (PDT), Telstar Electronics
>

But I was under the impression that RF clippers only work on SSB?...
and the installation involves tearing into the IF section?

james

unread,
Jun 11, 2008, 10:18:48 PM6/11/08
to

|--------------

Correct. An RF clipper an be inserted after the SSB filters or before.
There are versions that do the clipping after the balance modualtor
and before filters. Sherwood did a RF clipper for the Drake TR4 that
was after the SSB filters and had crystal filters to restore the
original bandwidth.

Generally RF clipping is a bit more expensive than audio compression.
Then you get what you pay for.


james

Ian Jackson

unread,
Jun 12, 2008, 4:03:36 AM6/12/08
to
In message <sl1154du7jqb1g99k...@4ax.com>, james
<geo...@washington.edu> writes

I thought that there were some stand-alone RF clippers. Surely there is
no reason why they cannot be external units, inserted in-line between
the mic and the mic socket (ie audio in - audio out)?

Obviously they have to contain 'all the works' (oscillator, balanced
modulator, compressor, clipper, filters, balanced demodulator etc), but
at least they are self-contained and universal.

Regarding filtering, the main advantage of RF clippers is that they
eliminate the effects of second-order distortion, and only have the
distortion produced by in-band third order intermodulation. For
cheapness and simplicity, if you leave out the SSB filtering (ie do
everything at DSB), you will have at least twice the number of in-band
IM products. But how much worse is this than having SSB filtering?
--
Ian

Paul Keinanen

unread,
Jun 12, 2008, 5:45:03 AM6/12/08
to
On Thu, 12 Jun 2008 09:03:36 +0100, Ian Jackson
<ianREMOVET...@g3ohx.demon.co.uk> wrote:

>I thought that there were some stand-alone RF clippers. Surely there is
>no reason why they cannot be external units, inserted in-line between
>the mic and the mic socket (ie audio in - audio out)?
>

At least Datong made a stand-alone unit. There was an article about
RF-clipping and the Datong unit in Wireless World a few decades ago.

Paul OH3LWR

Telstar Electronics

unread,
Jun 12, 2008, 7:24:35 AM6/12/08
to
> I thought that there were some stand-alone RF clippers. Surely there is
> no reason why they cannot be external units, inserted in-line between
> the mic and the mic socket (ie audio in - audio out)?

Huh? How can you do RF clipping outside the unit? Not a chance...
Any unit that's inserted in the mic jack is no RF clipper.
www.telstar-electronics.com

Ian Jackson

unread,
Jun 12, 2008, 8:28:38 AM6/12/08
to
In message
<c2363b23-32a8-4578...@d1g2000hsg.googlegroups.com>,
Telstar Electronics <briang...@sbcglobal.net> writes

As I said. "Obviously they have to contain 'all the works' (oscillator,

balanced modulator, compressor, clipper, filters, balanced demodulator

etc)."

And, as Paul said, "At least Datong made a stand-alone unit. There was

an article about RF-clipping and the Datong unit in Wireless World a few
decades ago."

But maybe Datong didn't know what they were doing.
--
Ian

Harold E. Johnson

unread,
Jun 12, 2008, 9:30:35 AM6/12/08
to

>>Huh? How can you do RF clipping outside the unit? Not a chance...
>>Any unit that's inserted in the mic jack is no RF clipper.
>>www.telstar-electronics.com
>
> As I said. "Obviously they have to contain 'all the works' (oscillator,
> balanced modulator, compressor, clipper, filters, balanced demodulator
> etc)."
>
> And, as Paul said, "At least Datong made a stand-alone unit. There was an
> article about RF-clipping and the Datong unit in Wireless World a few
> decades ago."
>
> But maybe Datong didn't know what they were doing.
> --
> Ian

They had a lot of company, and the residents here have a very short memory.
Datong was second. Comdel made an RF clipper in the late 60's and early
70's. Mike input and amplifier, mixed up to 455 KHz, sideband generated,
clipped the hell out of it, filtered it with a second filter, mixed back
down to audio with the same LO for injection to your mike input jack. Every
serious contester and DXer had one. Cost more than the receiver.

W4ZCB


Ian Jackson

unread,
Jun 12, 2008, 9:45:18 AM6/12/08
to
In message <%x94k.205330$yE1.184476@attbi_s21>, Harold E. Johnson
<W4...@mchsi.com> writes
Yes, a quick Google on "RF clipper"+Datong brings up lots of info -
about Datong and lots of others. This is one of the first:
http://www.qsl.net/m0ezp/radio-datong.html
--
Ian

Telstar Electronics

unread,
Jun 12, 2008, 11:35:20 AM6/12/08
to

> As I said. "Obviously they have to contain 'all the works' (oscillator,
> balanced modulator, compressor, clipper, filters, balanced demodulator
> etc)."

That sounds very complex and expensive all right.
Another problem I see is that they only work on SSB.
My customers insist on something small that fits inside the radio and
processes in all modes. The VoiceMax does that with less than 1% THD.
Can't build them fast enough to keep them in stock...

Ian Jackson

unread,
Jun 12, 2008, 2:15:35 PM6/12/08
to
In message
<28149a87-09f2-4778...@34g2000hsh.googlegroups.com>,
Telstar Electronics <briang...@sbcglobal.net> writes
>

Why do you think that they only work on SSB? Stand-alone RF clippers
like the Datong are independent of transmit mode. They are audio in -
audio out (with a bit of RF magic in between). They should work even on
an audio PA system.
--
Ian

Telstar Electronics

unread,
Jun 12, 2008, 4:00:22 PM6/12/08
to

> Why do you think that they only work on SSB? Stand-alone RF clippers
> like the Datong are independent of transmit mode. They are audio in -
> audio out (with a bit of RF magic in between). They should work even on
> an audio PA system.

OK, thanks for your input.

Steve

unread,
Jun 12, 2008, 11:43:05 PM6/12/08
to
Berhinger has consumed that nitch now, especially with ESSB.

--
http://NewsReader.Com/

Telstar Electronics

unread,
Jun 13, 2008, 8:44:37 AM6/13/08
to
> Berhinger has consumed that nitch now, especially with ESSB.

LOL... a unit like that (http://www.nu9n.com/deq2496.html) would cost
you at least $300. That's more than your whole station is worth!
Come on... you know how frugal hams & cbers are. Get real.
www.telstar-electronics.com

Steve

unread,
Jun 13, 2008, 9:03:28 AM6/13/08
to
Telstar Electronics <briang...@sbcglobal.net> wrote:
> > Berhinger has consumed that nitch now, especially with ESSB.
>
> LOL... a unit like that (http://www.nu9n.com/deq2496.html) would cost
> you at least $300. That's more than your whole station is worth!
>
Dream on, Brian. You can't touch my ts870 for less than $1000, more like
$1200 if you can find one.

>
> Come on... you know how frugal hams & cbers are. Get real.
> www.telstar-electronics.com
>
I'm hearing more and more voodoo audio these days so there are plenty of
stations running rack gear, try more listening and less spamming your junk.

--
http://NewsReader.Com/

Telstar Electronics

unread,
Jun 13, 2008, 2:00:42 PM6/13/08
to
> Dream on, Brian. You can't touch my ts870 for less than $1000, more like
> $1200 if you can find one.

You mean that old beat up one you got at the garage sale?
I didn't know you ever got that thing working since it was under water
and so rusty inside.
Kudos on your technician skills... fixing up that old dog.

Steve

unread,
Jun 14, 2008, 3:02:37 PM6/14/08
to
What the hell are you smoking, Brian? I traded an ft-920 for this 870.

--
http://NewsReader.Com/

Telstar Electronics

unread,
Jun 15, 2008, 10:09:53 AM6/15/08
to
> Laura Halliday VE7LDH     "Non sequitur. Your ACKS are
> Grid: CN89mg                    uncoordinated."
> ICBM: 49 16.05 N 122 56.92 W       - Nomad the Network Engineer

Good to hear from you Laura. You can see a photo of the Voicemax
speech processor in a radio... right before the radio was buttoned up
at http://tinyurl.com/2t2usu

NoMoreSpam

unread,
Jun 16, 2008, 8:38:12 AM6/16/08
to Telstar Electronics

Appropriately, a CB radio, illegally modified. Only a CBer would fall for this
"Speech Processor."

Telstar Electronics

unread,
Jun 16, 2008, 8:47:07 AM6/16/08
to
> Appropriately, a CB radio, illegally modified. Only a CBer would fall for this
> "Speech Processor."

Laura,
Evidently there are many radio operators worldwide that don't share
your views...
Thanks for your comment anyway...

fghi003

unread,
Jun 19, 2008, 3:15:29 AM6/19/08
to

On a farm out in the country lived a man and a woman and their three
sons. Early one morning, the woman awoke, and while looking out of the
window onto to the pasture, she saw that the family?s only cow was
lying dead in the field. The situation looked hopeless to her -- how
could she possibly continue to feed her family now?'wow gold'
(http://trv2china.com/aboust%20us.htm)In a depressed state of mind, she
hung herself. When the man awoke to find his wife dead, as well as the
cow, he too began to see the hopelessness of the situation, and he shot
himself in he head. 'wow gold'
(http://trv2china.com/contact%20us.htm)Now the oldest son woke up to
discover his parents dead (and the cow!), and he decided to go down to
the river and drown himself. When he got to the river, he discovered a
mermaid sitting on the bank. She said, "I?ve seen all and know the
reason for your despair. But if you will have sex with me five times in
a row, I will restore your parents and the cow to you." The son agreed
to try, but after four times, he was simply unable to satisfy her
again. So the mermaid drowned him in the river.'wow gold'
(http://wow-ffxi-gil.com/About%20us.htm)Next the second oldest son woke
up. After discovering what had happened, he too decided to throw himself
into the river. The mermaid said to him, "If you will have sex with me
ten times in a row, I will make everything right." And while the son
tried his best (seven times!), it was not enough to satisfy the
mermaid, so she drowned him in the river.'wow gold'
(http://wow-ffxi-gil.com/Contact%20us.htm)The youngest son, woke up and
saw his parents dead, the dead cow in the field, and his brothers gone.
He decided that life was a hopeless prospect, and he went down to the
river to throw himself in.And there he also met the Mermaid. "I have
seen all that has happened, and I can make everything right if you will
only have sex with me fifteen times in a row."The young son replied, "Is
that all? Why not twenty times in a row?"The mermaid was somewhat taken
aback by this request. Then he said, "Hell, why not twenty-five times
in a row?" And even as she was reluctantly agreeing to his request, he
said, "Why not THIRTY times in a row?"Finally, she said, "Enough!!
Okay, if you will have sex with me thirty times in a row, then I will
bring everybody back to perfect health."Then the young fellow asked,
"Wait! How do I know that thirty times in a row won?t kill you like it
did the cow?"


--
fghi003

Telstar Electronics

unread,
Jul 2, 2008, 8:42:18 AM7/2/08
to
> Appropriately, a CB radio, illegally modified. Only a CBer would fall for this
> "Speech Processor."

Yes, VoiceMax is selling well. We are unable to keep up with the
demand at this time. These units are back-ordered until late August08.

Channel Cop

unread,
Jul 2, 2008, 10:41:44 AM7/2/08
to

"Telstar Electronics" <briang...@sbcglobal.net> wrote in message
news:52fc1cc4-417a-40a0...@r66g2000hsg.googlegroups.com...

sound more like the garbage that fell off of the BACK of the animal while it
was taking a CRAP. OH - wait a minute - "back-ordered" - that is the
convention that you go out and turn-around and order something?
>


NoMoreSpam

unread,
Jul 3, 2008, 2:27:09 PM7/3/08
to Telstar Electronics
Just another example of how many morons are passing the so-called "exams" these
days.

Telstar Electronics

unread,
Jul 7, 2008, 7:23:51 AM7/7/08
to
On Jul 2, 9:41 am, "Channel Cop" <ned...@yahoo.com> wrote:
> sound more like the garbage that fell off of the BACK of the animal while it
> was taking a CRAP.  OH - wait a minute - "back-ordered" - that is the
> convention that you go out and turn-around and order something?

Thanks for your comment. In regard to your email... more VoiceMax
modules will be available earlier than expected... around August 1st.
We should have a few left after the back-orders are sent out.

www.telstar-electronics.com

Tom

unread,
Jul 29, 2008, 11:14:43 PM7/29/08
to
On Jun 12, 11:35 am, Telstar Electronics <briangrif...@sbcglobal.net>
wrote:

DF4ZS developed a RF speech clipper that fits into the Yaesu MH-31
microphone shell. This mic is used with the popular, tiny FT-817
transceiver along with others and in all speech modes. His clipper has
a SSB IF.

Details: http://jwm.de/afu/0ft817eng.htm
Reviews: http://www.eham.net/reviews/detail/2732 (6)

There are no reviews of the VoiceMax on eham.net while there are 21 of
the W4RT Electronics "One Big Punch" which uses a similar IC and can
be installed either in the MH-31 or inside the case of the FT-817 et
al.

DF4ZS also makes an outboard RF Clipper with adjustable a.f.
compression and integrated noise gate.

If you don't mind tying up a computer to do your speech processing,
VE3NEA developed freeware to work with a soundcard between the mic and
the transmitter that functions as bandpass filter, 7-band equalizer,
noise gate, compressor, and RF envelope clipper. http://www.dxatlas.com/VShaper/

Telstar Electronics

unread,
Jul 30, 2008, 8:03:30 AM7/30/08
to
On Jul 29, 10:14 pm, Tom <holden_fam...@sympatico.ca> wrote:
> DF4ZS developed a RF speech clipper that fits into the Yaesu MH-31
> microphone shell. This mic is used with the popular, tiny FT-817
> transceiver along with others and in all speech modes. His clipper has
> a SSB IF.
>
> Details:http://jwm.de/afu/0ft817eng.htm
> Reviews:http://www.eham.net/reviews/detail/2732(6)
>
> There are no reviews of the VoiceMax on eham.net while there are 21 of
> the W4RT Electronics "One Big Punch" which uses a similar IC and can
> be installed either in the MH-31 or inside the case of the FT-817 et
> al.
>
> DF4ZS also makes an outboard RF Clipper with adjustable a.f.
> compression and integrated noise gate.


This DF4ZS is a clipping type processor... nothing like the VoiceMax
audio compressor. You are correct, Since VoiceMax is a new product and
there are only about 150 units in use worldwide... so far there are no
reviews on Eham. Thanks for your interesting comments.
www.telstar-electronics.com

Tio Pedro

unread,
Jul 30, 2008, 8:36:26 PM7/30/08
to

"Telstar Electronics" <briang...@sbcglobal.net> wrote in message This
DF4ZS is a clipping type processor... nothing like the VoiceMax
audio compressor.

That is true. SSB RF clipping is proven to deliver an honest 6 dB
improvement.


0 new messages