What is the dB advantage of this vs. RF clipping for SSB?
It is a splatter box add-on.
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
|----------------------
RF Clipping is superior to audio compression in SSB transmission. RF
clipping will provide about 6dB improvement over audio compression
alone.
james
> |----------------------
>
> RF Clipping is superior to audio compression in SSB transmission. RF
> clipping will provide about 6dB improvement over audio compression
> alone.
>
> james
Rhetorical question :)
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.
Lots of splatter immediately upon installation.
Actually, if adjusted correctly... no splatter... and 100% constant
modulation.
www.telstar-electronics.com
|----------------
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
|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?
|--------------
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
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
>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
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
An outboard RF clipper will work on any voice mode, do you actually have
any qualification in electronics or do you just make it up as you go
along???
Gerry ....
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
|--------------------
The answer is No and Yes
james
Appropriately, a CB radio, illegally modified. Only a CBer would fall for this
"Speech Processor."
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.
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/
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
That is true. SSB RF clipping is proven to deliver an honest 6 dB
improvement.
Remember way back when this was posted?
Dam..... I wish YZ the great one was still posting here!!
<PROCEEDING> 98-143
<DATE> 11.27.98
<NAME> STEVEN JAMES ROBESON
<ADDRESS1> HCR65 BOX 572
<ADDRESS2> POB 2103
<CITY> DUNLAP
<STATE> TN
<ZIP> 37327
<LAW FIRM> NONE
<ATTORNEY> NONE
<FILE NUMBER> NONE
<DOCUMENT-TYPE> CO
<CONFIDENTIAL> N
<PHONE NUMBER> (???) -???-????
<DESCRIPTION> Comments on WT 98-143
<NOTIFY> erlpnk...@aol.com
<TEXT>
To the Members of the Commission Assembled:
I am Steven Robeson. I have been a licensee in the Amateur Radio
Service
since 1972 and am presently the licensee of Amateur Radio Station K4YZ
and hold
an Amateur Extra Class Operators license. I comment to you today on
the matter
of WT 98-143.
There can be no doubt that there has been quantum leaps in the
field of
radiocommunication since the last major rewrite of Part 97. This
includes the
"Incentive Licensing" system that was implemented in the late 1960's.
It is
clearly time to change the system.
The Commission has solicited comments relative to that
circumstance, and I
hope the following will be considered in that act.
First of all, I would like to wholeheartedly approve of the
concept of
reducing the number of Amateur License classes from six to four.
There is much
confusion as to "who's who" as it is now, and a reduction in the
licensing
process would alleviate that disparity. As such, I envision the
following as
being appropriate for said restructuring:
Amateur Class D: The Amateur Class D license would become the de
facto
"entry class" license for the Amateur Service. In light of the
grossly
decreased demand for the Novice License and reduced useage of the sub-
bands
allocated for thier use, I would deactivate it as the "entry class"
licenese.
The Class D License would for all intents and purposes be the same as
the
current "Codeless Technician" class license. The examination for this
license
would remove questions pertaining to HF (1.8 to 30 MHZ) theory and
operation,
and be strictly limited to matters pertaining to VHF/UHF theory and
operation,
regulatory matters and Amateur practice. All Amateur privileges above
30 MHZ
would be conveyed to the successful applicant.
Amateur Class C: The Class C license would be the entry level
license for
operation on the HF spectrum. It would require the successful
applicant either
hold a Class D license, or successfully complete the Class D
examination in
addition to an examination on basic HF theory, propagation and
practice. It
would also require an examination in proficiency in the sending and
receiving
of Morse Code at a speed of not more than 5 (five) words per minute.
Persons
presently holding a Novice Class License or Technician Plus license
would be
grandfathered into this class of license, except that they would be
required to
take a 20 question open book examination at a VE Testing Session on
the
privileges and restrictions of the Class C License prior to utilizing
those
privileges. Allocations would include those presently enjoyed by the
Amateur
General Class licensee except for operation of the 160, 30, 17 and 12
meter
bands.
Class B: The Class B license would incorporate the present
Amateur
General and Amateur Advanced license. All amateur priviledges as are
presently
enjoyed by the Amateur Advanced would be authorized with Amateur
General's
being grandfathered into Class B. New licensee's would be required to
pass a
written examination on advanced radio frequency technology, amateur
practice,
regulations and an examination in proficiency in the sending and
receiving of
Morse Code at a rate of not more than 12 (twelve) words per minute.
This would
be consistent with the present CEPT program, which the United States
is
presently negotiating membership in. Additional frequency allocations
would be
authorized by the "refarming" of the subbands presently allocated to
the Novice
Class, and divided with the Class A license.
Class A: The Amateur Class A would convey all Amateur operating
privileges to the successfull applicant. Present subband
authorizations
enjoyed in the "CW" bands would be unchanged and new exclusive phone
allocations for the Class A would be "refarmed" from the deactivated
Novice
license and by rellocating from the "high" end of present CW
allocations where
operation is sparse. A quick scanning of those portions of the
spectrum will
demonstrate that minimal use is made of this portion of the
authorized
allocations and reallocation to "phone" or other "wideband" emission
types is
reasonable.
The Class A applicant will demonstrate advance/expert level
knowledge of
RF technology and Amateur practice. No additional Morse Code
examination would
be required.
To further simplify the administrative process of the Commission,
I would
discontinue the present "sequential" callsign system. Upon successful
passing
of the requirements for an Amateur Examination, the applicant would be
issued a
"2 by 3" callsign (ie: KA4AAA) by the Commission. Those wishing to
specifically select a callsign of a particular format would be
provided that
opportunity by the "Vanity" callsign system. The Commission would
specify
those formats of callsigns permitted by class, but it would be up to
the
applicant to chose the desired call, and appropriate fee paid for the
privilege
of obtaining said call.
As for the occassionally emotional debate on the retention of the
Morse
Code requirement, I am steadfastly in favor of retention of the use of
Morse
Code and demonstration of it's use for the Amateur Service. Among
it's prouder
traditions has been the Amateur's ability to communicate across
international
boarders and foster communication between citizens in countries which
may not
have a common language in which to conduct that communication. Morse
Code is
the "common denominator" in international communications and should
be
retained.
As for the arguement that more efficient or reliable methods of
communication exist, it is a time proven fact that the simplicity of
Morse Code
systems has allowed us to communicate with portions of the world that
cannot
enjoy the same level of access to technology that we as American's
enjoy.
And to echo the comments of another commentor to these
proceedings, I
would like to express my concern over the decline of the overall
technical
skill and knowledge of the average Amateur. I firmly believe that
this is the
direct result of the publishing of Amateur Radio question and answer
test pools
in the public domain. I feel it is as rediculous a concept as for our
schools
to prepublish the questions and answers of mid-terms and finals.
Closing the
pools except to the VEC's, the Commission, and an independent
oversight
committee approved by the Commission would go a long way towards
ensuring that
the successful applicant has a minimal and sufficient retention of
the
requisite knowledge for an Amateur license.
Lastly, I would consider all of this for naught if the Commission
were to
fail to make a determined and on-going effort to enforce the rules
and
regulations as they pertain to the operation of Amatuer Radio
Stations. It is
an embarrasment that we are as frail as any other subset of human
society, and
we too have our share of ner'-do-wells and rabble-rousers. But unlike
a local
"protest" or civil disturbances in one localized area,
radiocommunication has
the potential of causing a disruption over a massive, if not world-
wide area,
even when that disruption is perpetrated by only a few "rotten
apples". The
Amateur Service still prides itself on it's own "self policing"
activities, and
this activity is unprecedented in any other Service under the
Commission's
domain, but only so much can be accomplished short of vigilanteism.
The Commission's assurance that they will enforce these regulations
and back it
up with action will be the one greatest action the Commission could
take.
Respectfully Submitted,
/s/ Steven James Robeson, LPN
Amateur Radio Staton K4YZ
Wow, guess it must really suck to be Steve, or anyone who agrees with him
on the Morse code issue. Or you.
--
________________________________________________________________________
Hail Eris! Cthulhu fhtagn! mhm 29x21; Top Asshole #3; Lits Slut #16
Chas. E. Pemberton; Most Hated Usenetizen of All Time #13
Gutter Chix0r #17; BowTie's Spuriously Accused Pedo Photographer #4
COOSN-029-06-71069; Usenet Ruiner #5; Official Chung Demon
AUK Psycho & Felon #21; Parrot & Zombie #2
Anonymous Psycho Criminal #18
Pierre Salinger Memorial Hook, Line & Sinker, June 2008
Hammer of Thor, July 2008
"Life size models of Cthulhu, on sale now!"
"Folklore is a 19th century Romanticist movement based on
contemporary popular northern European music."
"The entire concept was concocted by the Brothers Grimm during the
Romanticist literary period and entered the discipline of music in the
following century with the Romanticist musical period after Beethoven."
-- Please send medical bills for any damage to your health caused by the
above two quotes to Agamemnon-Skopianosfaktis. Message-ID:
<UNGdnZVRnLb...@eclipse.net.uk>
"Kolofilia between a human and another human is as depraved as fucking
animals." -- Agamemnon, poutso kelftis, just plain doesn't like sex,
apparently. Message-ID:
<asqdneLCt_DZ6e_V...@eclipse.net.uk>
"Roe V Wade has zero bearing on my existence other than it affects it
adversely."
-- Johnny Wentzky never had much truck with "logic". Message-ID:
<V6xNe.27650$XM3....@bignews5.bellsouth.net>
"You are the GOD-DAMNED, IGNORANT LIAR here.
Now, that is not me taking the Lord's name in vain."
-- John Wentzky: Living proof of the Death of Irony, in Message-ID:
<jljOe.5348$ZD4....@bignews3.bellsouth.net>
"For the most part, morality is universal." -- John "Easily" Shocked
"The whining has just begun." -- John Wentzky, in Message-ID:
<Ie2Qe.8199$wb5....@bignews1.bellsouth.net>
"Gay men deserve to die." -- John Wentzky, in Message-ID:
<RSR3f.23691$5l.1...@bignews1.bellsouth.net>
"Laws count, the US Constitution count more, and we need to have judges
on the bench who are going to Carry Out those laws, not Make Law or
Interpret Law." -- John "Easily" Shocked contradicts his own words on
the overriding importance of society's reluctance to accept
homosexuality, in Message-ID: <brIDe.67062$Qo.12613@fed1read01>
"I heard that you are still trespassing in the USA. If it's black, it
refuses to work and it accuses whites of racism. What a joke.
Look at a map and see where Africa is, bitchboy. What is this GOD DAMNED
NIGGERISH ALLEGIANCE YOU HAVE TO TRYING TO GET WHITE PEOPLE TO HAND OFF
OTHER WHITE PEOPLE TO SOMEONE YOU THINK IS NOT AGAINST YOUR CRIMINAL
ALLEGIANCE??????
Too afraid to tell the truth?
WIMPS!
COWARDS!
LIARS!
MILITANT ASSPRICKS!
LOSERS!
FAILED BULLSHITBOYS WHOSE CANDY HAS NO RED ON IT! YOU KNOW IT TO BE TRUE!
I LICKED THE RED OFF YOUR CANDY BECAUSE YOU ARE YOUR ILK HAVEN'T GOT ANY
FURY!
THAT'S WHY YOU CAN'T BEAT ME VIA ANY LAWFUL MEANS WHATSOEVER! YOU'RE A
NAMBY PAMBY ANTI-USA ASSPRICK!" -- Huge pools of MOLTEN WENTZKY are
being found all over the Carolinas, after his reply to Panama Floyd, in
Message-ID: <qiA3k.2556$Xe....@bignews1.bellsouth.net>
http://www.screedbomb.info/coosn/
Q: Who is eligible for a COOSN?
A: Kookologists with 10 or more verifiable UV points may exchange these
points for a Cabal Obsidian Order Sombrero Number.
Q: Who is *not* eligible for a COOSN?
A: Certified net.kooks; notorious net.cretins; terminally clueless
fuckwits; previous winners of kook-awards, unless an official pardon has
been granted by the FNVW.
Q: How do I apply for a COOSN?
A: Make a Usenet post to alt.usenet.kooks (crossposting to your favourite
newsgroups is acceptable); to ensure that the FNVW actually sees your
request, try to use either of the following formats for the subject line:
[COOSN Application] Your name (or best known handle) here
[COOSN Request] Your name (or best known handle) here
Please provide a list of 10 UV points - along with verifiable evidence for
each point wherever possible.
Q: Can one Kookologist nominate *another* Kookologist for a COOSN?
A: Yes, but the proposer should supply a verifiable list of 10 UV points
for the nominee at the time of the nomination. Also, the nominee must
accept the nomination before a COOSN is issued.
Q: What happens if my Sombrero Number application is refused by the FNVW?
A: The Office of Darth Bawl is always looking for new candidates. Nuff
said.
Q: What are "UV points"?
1. Threats of violence, especially death. (one point per kook)
2. Lists, i.e. *real* lists, not just mentions of two or three names in
the same post. One list per kook, unless the lists are clearly meant to
serve different purposes.
3. Fanboi sites (one point per kook, not one point per site. Minimum
qualification is a whole page about you; pages containing lists don't
score extra if the list also appears on Usenet).
4. Fanboi newsgroups (one point per kook, not one point per group)
5. Attempts at real-life contact (e.g. posting phone numbers)
6. Fake awards, revenge nominations etc. (one point per kook)
7. Mentions in a newsgroup FAQ (e.g. soc.men).
8. Being the target of a Kooksuit (one point per kook).
Gerald C. Newton is a wife-beating fuckhead.
yes he was calling to make the license more complex at a time when the
FCCmade it clear it wanted and was going to have a simpler licensing
scheme
fred and his freinds can't ignore me sinc ethey have mental illnesses
that make em afraid to even allow exist in the same NG
> >fred and his freinds can't ignore me sinc ethey have mental illnesses
> >that make em afraid to even allow exist in the same NG
>
> You are like a retarded parrot. Does Markie want a cracker or perhaps
> more crack. Why are you a fucktard, Mark?
why do you sit there and comit libel of a man you hav enever met and
pobviously know nothing about ?
yes I do and calling me a drug user with malious intent is libel
>And
> unfortunately, we know more about you than we ever wanted to know.
no hou know your own fantasies about my life very little is accualy my
life
> You
> live out your life on Usenet. How pathetic...