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This is from a web-site that is replaying Usenet, including
net.ham-radio, from 30 years ago (currently early 1985). The site is:
http://www.olduse.net
If you prefer to use your own newsreader, the site also supports an NNTP
connection at:
nntp.olduse.net:119
>From net.ham-radio Sun Mar 1 09:14:50 2015
>Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
>Posting-Version: version B 2.10.2 9/18/84; site brl-tgr.ARPA
>Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore! decvax!genrad!panda!talcott!harvard!seismo!brl-tgr!tgr!carpenter@NBS-VMS
>From: carpenter@NBS-VMS
>Newsgroups: net.ham-radio
>Subject: ACSB
>Message-ID: >
>Date: Thu, 21-Feb-85 15:54:52 EST
>Article-I.D.: brl-tgr.8425
>Posted: Thu Feb 21 15:54:52 1985
>Date-Received: Tue, 26-Feb-85 20:08:37 EST
>Sender:
>Lines: 9
>Xref: dummy dummy:1
>X-OldUsenet-Modified: added Xref
I think the recent answer about ACSB Amplitude Compandered Side Band
missed one point. As far as I can tell, a pilot carrier is transmitted
in ACSB. This makes receiver afc/lockon possible - which would seem to
be needed at UHF (no tuning dial, wide temperature range). Thus reception
on a ham receiver might turn up "poor carrier suppresion" (or a
whistle if the pilot has been chosen above the intended audio range).
Bob Carpenter, W3OTC
>From net.ham-radio Sun Mar 1 09:14:50 2015
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>Path: utzoo!utcs!lsuc!pesnta!amdcad!decwrl!dec-rhea!dec-mred!soomre
>From:
>Newsgroups: net.ham-radio
>Subject: ACSB Transmissions
>Message-ID: >
>Date: Mon, 18-Feb-85 14:43:34 EST
>Article-I.D.: decwrl.625
>Posted: Mon Feb 18 14:43:34 1985
>Date-Received: Mon, 18-Feb-85 22:45:43 EST
>Sender:
>Organization: DEC Engineering Network
>Lines: 19
>Xref: dummy dummy:1
>X-OldUsenet-Modified: added Xref
A new experimental mode of transmission on the VHF land mobile
band (150-174 MHZ) is being used called ACSB. I am not sure what it
stands for, something like Amplitude Compared Side Band. I think it
is used like SSB on hf.
Is a transmission of this type receiveable on a Kenwood R2000 hf
receiver with the optional 118-174 MHZ converter using either
LSB or USB modes ?
Keep up the good info, questions and answers, as I look forward
to reading news on this net daily.
........
73's
Ed Soomre (N1BFF)
Digital Equipment Corp
1 Iron Way
Marlboro, MA 01752
>From net.ham-radio Sun Mar 1 09:14:50 2015
>Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
>Posting-Version: version B 2.10.2 9/18/84; site petrus.UUCP
>Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore! petrus!karn
>From:
>Newsgroups: net.ham-radio
>Subject: Re: ACSB Transmissions
>Message-ID: >
>Date: Tue, 19-Feb-85 11:31:21 EST
>Article-I.D.: petrus.291
>Posted: Tue Feb 19 11:31:21 1985
>Date-Received: Fri, 22-Feb-85 06:58:54 EST
>References: >
>Organization: Bell Communications Research, Inc
>Lines: 35
>Xref: dummy dummy:1
>X-OldUsenet-Modified: added Xref
> A new experimental mode of transmission on the VHF land mobile
> band (150-174 MHZ) is being used called ACSB. I am not sure what it
> stands for, something like Amplitude Compared Side Band. I think it
> is used like SSB on hf.
"ACSB" is a trademark of STI (Sideband Technology Inc), the very same
guys who want to take our 220 mhz band. The acronym stands for
Amplitude Compandored [single] SideBand.
>
> Is a transmission of this type receiveable on a Kenwood R2000 hf
> receiver with the optional 118-174 MHZ converter using either
> LSB or USB modes ?
Yes, ACSB can be received on a standard SSB receiver, although not with
the same fidelity as the intended receiver. ACSB consists of an ordinary
SSB signal in which the audio has been compressed and a "pilot tone"
indicating the level of compressor gain has been added. The receiver
simply locks to the pilot tone (which has the side effect of providing
a stable frequency reference) and varies the gain of an expander amplifier
so as to keep the pilot tone at a constant level.
ACSB really works, particularly in marginal fading conditions like a
channel on Oscar-10. The extra gain during unvoiced speech segments
and higher average transmitter power makes the difference between being
intelligible and being mostly below the noise floor. Off-axis spin fading
is taken right out. Listening fatigue is considerably reduced because the
background noise almost disappears between syllables.
A couple of stations are beginning to experiment with ACSB on Oscar-10.
For more info, contact Vern Riportella, WA2LQQ, POB 177, Warwick, NY 10990.
Homebrew ACSB circuits are starting to appear in the ham magazines.
Phil
>From net.ham-radio Sun Mar 1 09:14:50 2015
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>Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore! decvax!mcnc!ecsvax!mjg
>From: (Michael Gingell)
>Newsgroups: net.ham-radio
>Subject: Re: ACSB Transmissions
>Message-ID: >
>Date: Thu, 21-Feb-85 10:29:52 EST
>Article-I.D.: ecsvax.739
>Posted: Thu Feb 21 10:29:52 1985
>Date-Received: Tue, 26-Feb-85 08:14:25 EST
>References: >, >
>Organization: NC Educational Computing Service
>Lines: 7
>Xref: dummy dummy:1
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ACSB sounds a lot like LINCOMPEX - a modulation scheme used
in radio equipment made and sold for years by Standard Telephone
and Cables in Britain. I understand it is sold mainly for
diplomatic (embassy) communications equipment all over the world.
Mike Gingell (..decvax!mcnc!ecsvax!mjg)
>From net.ham-radio Sun Mar 1 09:14:50 2015
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>Path: utzoo!watmath!clyde!burl!ulysses!allegra!bellcore! decvax!genrad!panda!talcott!harvard!seismo!brl-tgr!tgr!d3unix!jhs@Mitre-Bedford
>From:
>Newsgroups: net.ham-radio
>Subject: Re: ACSB Transmissions
>Message-ID: >
>Date: Thu, 21-Feb-85 12:24:31 EST
>Article-I.D.: brl-tgr.8406
>Posted: Thu Feb 21 12:24:31 1985
>Date-Received: Tue, 26-Feb-85 20:07:47 EST
>Sender:
>Lines: 21
>Xref: dummy dummy:1
>X-OldUsenet-Modified: added Xref
ACSB is Amplitude Companded Single sideBand or something like that.
As near as I can tell, it is very much like the SSB widely used on the ham
bands these days by speech processor afficionadi, except that the receiver
has a provision for expanding the dynamic range again, so it shouldn't sound
quite so awful on receivers so equipped. If you listen with your Kenwood,
it should be perfectly intelligible, but probably would sound like someone
running a lot of compression (which they are).
According to some of my old cohorts at Motorola, ACSB is nice in theory, but
loses out to FM (which they conveniently happen to be able to supply from
their standard product line) in urban environments where the real limiting
factors are adjacent-channel interference, intermod, multipath, and all those
things that don't show up in the academic investigations of SNR in FM versus
ACSB systems. Clearly, Motorola has an axe to grind, but they also have a
whole lot of RF systems expertise and actual experience with urban
environments, so their opinion should be considered very seriously before
everybody converts madly to ACSB!
73,
John Sangster, W3IKG
jhs at mitre-bedford
>From net.ham-radio Sun Mar 1 09:14:50 2015
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>From:
>Newsgroups: net.ham-radio
>Subject: Re: ACSB Transmissions
>Message-ID: >
>Date: Mon, 25-Feb-85 14:46:00 EST
>Article-I.D.: rocksvax.2300001
>Posted: Mon Feb 25 14:46:00 1985
>Date-Received: Fri, 1-Mar-85 06:25:59 EST
>References: >
>Lines: 25
>Nf-ID: #R:dec-mred:-62500:rocksvax:2300001:000:1163
>Nf-From: rocksvax!dave Feb 25 14:46:00 1985
>Xref: dummy dummy:1
>X-OldUsenet-Modified: added Xref
In ACSB a few percent of the channel power is dedicated to sending a pilot
carrier that is related to the actual carrier in some fashion out of the normal
"audio" band. The receiver phase locks to this pilot tone and adjusts the
BFO of the receiver to the exact frequency, eliminating the normal
"Donald Duck" effect of SSB mis-tuning.
- From what my roommate who owns a two-way shop says, the stuff is great in
strong signal areas, but when you get into the fringes the signal deteriorates
very rapidly, especially in fluttery conditions prevail.
My partner in my new company was the marketing VP for Sideband Technology
who perfected the technology told me of the gawking that the Motorola
folks did at the trade show they demonstrated their radio at, seems that
they where playing Barbara Striesdan(sp?) through their box and it
didn't sound half bad.
Motorola is like the IBM of the radio industry, whatever they invent is
"real". No one belieese anything can be done 'til they commercialize it.
Kinda like the recent IBM development of 'full-duplex' terminals.
Dave N2GH
arpa:
uucp: {allegra,rochester,amd,sunybcs}!rocksvax!dave
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