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- Date: Sat, 30 Oct 93 10:00:33 PDT
- From: Info-Hams Mailing List and Newsgroup <info-hams@ucsd.edu>
- Errors-To: Info-Hams-Errors@UCSD.Edu
- Reply-To: Info-Hams@UCSD.Edu
- Precedence: Bulk
- Subject: Info-Hams Digest V93 #1290
- To: Info-Hams
-
-
- Info-Hams Digest Sat, 30 Oct 93 Volume 93 : Issue 1290
-
- Today's Topics:
- Daily Solar Geophysical Data Broadcast for 29 October
- GAY INTERNATIONAL HAM RADIO CLUB
- Imminent death of ham
- Mirage Amplifiers in Repeater Service
- Problems with Kenwood TM-742A
- Studying in San Francisco
- Was 'Vanity' Call Signs, now paying for call signs
-
- Send Replies or notes for publication to: <Info-Hams@UCSD.Edu>
- Send subscription requests to: <Info-Hams-REQUEST@UCSD.Edu>
- Problems you can't solve otherwise to brian@ucsd.edu.
-
- Archives of past issues of the Info-Hams Digest are available
- (by FTP only) from UCSD.Edu in directory "mailarchives/info-hams".
-
- We trust that readers are intelligent enough to realize that all text
- herein consists of personal comments and does not represent the official
- policies or positions of any party. Your mileage may vary. So there.
- ----------------------------------------------------------------------
-
- Date: 30 Oct 93 16:07:53 GMT
- From: news-mail-gateway@ucsd.edu
- Subject: Daily Solar Geophysical Data Broadcast for 29 October
- To: info-hams@ucsd.edu
-
- !!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 302, 10/29/93
- 10.7 FLUX=091.8 90-AVG=094 SSN=038 BKI=4221 2212 BAI=008
- BGND-XRAY=B2.0 FLU1=6.7E+05 FLU10=1.1E+04 PKI=3322 322* PAI=011
- BOU-DEV=026,024,018,006,013,016,009,019 DEV-AVG=016 NT SWF=00:000
- XRAY-MAX= B8.1 @ 1306UT XRAY-MIN= B1.6 @ 0745UT XRAY-AVG= B3.3
- NEUTN-MAX= +001% @ 2325UT NEUTN-MIN= -003% @ 2020UT NEUTN-AVG= -0.4%
- PCA-MAX= +0.1DB @ 2310UT PCA-MIN= -0.5DB @ 2305UT PCA-AVG= -0.0DB
- BOUTF-MAX=55374NT @ 0211UT BOUTF-MIN=55338NT @ 1725UT BOUTF-AVG=55353NT
- GOES7-MAX=P:+000NT@ 0000UT GOES7-MIN=N:+000NT@ 0000UT G7-AVG=+064,+000,+000
- GOES6-MAX=P:+114NT@ 1625UT GOES6-MIN=N:-065NT@ 1126UT G6-AVG=+085,+018,-040
- FLUXFCST=STD:092,091,090;SESC:092,091,090 BAI/PAI-FCST=008,008,008/010,010,010
- KFCST=2333 2222 2233 3222 27DAY-AP=008,006 27DAY-KP=2233 2321 1222 1223
- WARNINGS=
- ALERTS=
- !!END-DATA!!
-
- NOTE: The Effective Sunspot Number for 28 OCT 93 is not available.
- The Full Kp Indices for 28 OCT 93 are not available.
-
- ------------------------------
-
- Date: 30 Oct 93 15:15:06 GMT
- From: mnemosyne.cs.du.edu!nyx!rcanders@uunet.uu.net
- Subject: GAY INTERNATIONAL HAM RADIO CLUB
- To: info-hams@ucsd.edu
-
- In article <dbledsoeCFJK67.FAB@netcom.com> dbledsoe@netcom.com (Donnelly R. Bledsoe) writes:
-
- Parts omitted
-
- >
- >> Apparently the complaint is still active in CT.
- >
- >Yes, on the advice of counsel, our complaint remains pending in Connecticut.
- >Our complaint alleges discrimination based on sexual orientation in public
- >accommodations in violation of Connecticut law. Let me point out that it
-
- It looks like you are trying to make new law. This is the first time I
- heard a publisher referred to as a "public accommodation" and sexual
- orientation applied to an organization ! Your case looks poor and I
- believe more that ever that LARC is trying to punish the ARRL out of spite.
-
- Public accommodations usually refers to business that are open to the
- public, I don't see how add sales fall under this provision.
-
- If the add was ordered by LARC I don't see haw an organization can have a
- sexual orientation.
-
- >was only after the ARRL learned of our intent to file our complaint that
- >the Executive Committee met and decided to return the decision relative to
- >LARC's ad back to staff. In other words, they dropped the hot potato back
- >into HQ's lap. However, HQ has not stated any new "policy" nor rescinded
- >any previous "policy" vis-a-vis LARC. Even though there have been
- >literally dozens of letters from LARC members and other concerned hams
- >seeking clarifications, explanations, and simply a clear statement of
- >policy from the ARRL regarding LARC's ad since 1985, not one word of the
- >now eight year old dispute has ever appeared in print in QST. Under these
- >circumstances, we cannot now simply drop our complaint. If we did so,
- >prior to receiving assurances of fair treatment and an end to the
- >discriminatory practices aimed at us since 1985, we would be leaving
- >ourselves without protection and recourse should the League once again
- >reverse itself on our ad as they did in 1985.
- >
- >> If the ARRL has made
- >> this movement towards conciliation, why hasn't LARC responded, by
- >> placing the ad, and dropping the complaint?
- >> curious,
- >> 73, doug
- >
- >What we are seeking is written assurance that LARC's ad (any appropriately
- >worded, ham radio related ad) will be published on an ongoing basis by QST
- >even if complaints from members are received relative to sexual
- >orientation, i.e., that the words gay, lesbian, bi-sexual or transgendered
- >appear in the ad. We feel that this might best be accomplished if the
- >League adopts, publishes and abides by a corporate non-discriminatory policy
- >which includes sexual orientation. Therefore, we are asking the League to
- >adopt such a policy which would also serve to re-assure any sexual minority
- >employees of the League that their employer does not discriminate based on
- >sexual orientation. Further, the League must recognize that they have hurt
- >our organization by freezing us out of QST since 1985. We have suggested
- >ways in which the ARRL could now work with our organization to further
- >the goals of both organizations, i.e., the growth of ham radio.
- >At minimum, the League publication QST MUST be made accessible to LARC
- >and its members. We've been frozen out since 1985. We're looking for a
- >good faith gesture to demonstrate that we now have access to
- >QST, that discrimination against us has ended, and that the League's motto
- >"Of, by and for the radio amateur" applies to all hams, gay or straight.
-
- And you want to punish them for offending your organization.
-
- Rod N0NZO
-
-
-
-
- --
- Rod Anderson | "I do not think the United States government
- rcanders@nyx.cs.du.edu | is responsible for the fact that a bunch of
- | fanatics decided to kill themselves"
- Clinton, Gore, gone in four | Slick Willie the Compassionate
-
- ------------------------------
-
- Date: Thu, 28 Oct 1993 23:02:27 GMT
- From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!spool.mu.edu!sgiblab!news.kpc.com!amd!netcomsv!netcom.com!netcomsv!cds8604!NewsWatcher!user@network.ucsd.edu
- Subject: Imminent death of ham
- To: info-hams@ucsd.edu
-
- Ham radio will die when we let it, not a moment before.
-
- No one cultural or technical issue can kill it. We can argue about banning
- special-interests, broadcasting, licensing structure, preferred modes of
- communication, and changes brought by rapidly evolving technology. These
- are of little consequence. They are simply reflections of the issues we
- have as a culture.
-
- Ham radio can neither solve nor exacerbate social issues. It's only
- mirror. We have a need for the mirror.
-
- The greatest value of ham radio is in its ability to free minds and
- stimulate the intellect. You can talk to people across the ocean using
- junk you have in your garage. No advance in technology can neutralize the
- ultimate physical principles that allow us to manipulate electromagnetic
- radiation for the transmission and reception of intelligence. You can
- always make a spark-gap, connect it to a piece of wire, and splatter a
- signal receivable by someone 1000 miles away who's using nothing but piece
- of galena and some wire to receive your signal.
-
- Contact at a distance using the immutable forces of nature is a powerful
- concept to teach to someone. That concept is without fault. It's perfect.
-
- If we load the medium with our own issues--that's an artifact of our
- sociology. If we bring negative feelings or religious dogma to the
- electromagnetic spectrum, that's a human side-effect. That's a me-and-you
- issue. Ham radio is not at fault. Ham radio is as easily disrupted with
- by solar storms as it is by people broadcasting extremist views. We even
- use similar terms to identify such interference. You're QRMed by the
- extremist, QRNed by the sun. Either way, the medium remains untainted. It
- simply does what it's told by an exciter. Then it goes back to being
- perfect forever.
-
- For as long as one of us is left to marvel at our ability to transmit
- pieces of our consciousness as easily as the sun sends us daylight, ham
- radio will remain alive.
-
- Joe
-
-
- --
- Joe Mastroianni A.R.S. AA6YD | "Up the airy mountain,
- jdm@cadence.com | Down the rushy glen,
- 74107,310:cserve | We daren't go a-hunting,
- JOE-M:Genie | For fear of little men."
- | - Allendale
- --------------------------------------------------------------------------
- The opinions expressed in this article do not reflect those of my employer
-
- ------------------------------
-
- Date: 30 Oct 93 14:13:48 GMT
- From: ogicse!emory!kd4nc!ke4zv!gary@network.ucsd.edu
- Subject: Mirage Amplifiers in Repeater Service
- To: info-hams@ucsd.edu
-
- In article <BAT.93Oct29071615@gdstech.GRUMMAN.COM> bat@gdstech.GRUMMAN.COM (Pat Masterson) writes:
- >We had used 2 Mirage amps (100w) in repeater service on Long Island
- >for many years. WE started having problems where some components
- >would overheat, and meltdown. A few repairs were done by club members,
- >but problems continued. So, we switched to a Vocomm amp, and it
- >is doing quite a nice job.
-
- Mirage amps are good amps, but you have to derate them for the high
- duty cycle of repeaters. 100 watt Mirage amps will live long and
- prosper when run at the 50 watt level. You can carry this derating
- too far, however. A 100 watt amp run at 25 watts may exhibit some
- symptoms of instability. Mirage amps are very traditional in design.
- Some of the newer amps using VFETs are better for high duty cycle
- use.
-
- Gary
-
- --
- Gary Coffman KE4ZV |"If 10% is good enough | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | for Jesus, it's good | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | enough for Uncle Sam."| emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | -Ray Stevens |
-
- ------------------------------
-
- Date: 29 Oct 1993 17:01:30 GMT
- From: pa.dec.com!nntpd.lkg.dec.com!smaug.enet.dec.com!legerlotz@decwrl.dec.com
- Subject: Problems with Kenwood TM-742A
- To: info-hams@ucsd.edu
-
- I have been thinking about purchasing a TM-742, the optional CTCSS decode unit, and installing the 6M brick.
-
- I'm a little hesitant at this point because of the problems you're having.
-
- Please post (or mail to me) any information you get from Kenwood about these
- problems.
-
- If these "problems" turn out to be "restrictions" I won't be happy with paying
- the $1100+ for them...
-
- 73
- n1ihu
- ------------------------------------------------------------------------
-
- These comments are my own and do not necessarily reflect the opinions of
- Digital Equipment Corporation.
-
- ------------------------------------------------------------------------
-
- ------------------------------
-
- Date: 30 Oct 93 13:40:26 GMT
- From: ogicse!emory!kd4nc!ke4zv!gary@network.ucsd.edu
- Subject: Studying in San Francisco
- To: info-hams@ucsd.edu
-
- In article <msattlerCFnCMx.2tJ@netcom.com> msattler@netcom.com (Michael Sattler) writes:
- >
- >I've modified my Kenwood TH-78A by removing diodes 4 and 5 as
- >specified and it's now able to do cross-band and rx 300-399 and
- >800-999 Mhz. The latter carries cellular traffic across a range I
- >haven't yet determined, but the former seems to be perpetually
- >quiet. I'm guessing that there is a reason that this band is made
- >available...
-
- That band is mainly used by military comm systems, airborne and
- land mobile. You'll hear activity if you are near a military
- training area. Note that you may hear FM, AM, and SSB in this
- spectrum.
-
- >What are the other three diodes for?
-
- Beats me. :-)
-
- >Do I need (and does someone make) an antenna that handles all four
- >bands?
-
- No and yes. You only really need an antenna to cover the bands on which
- you are allowed to transmit. The HT's receiver is so sensitive, too
- sensitive in fact, that it will pick up signals with any random hunk of
- metal used as an antenna. Of course if you're looking for weak signals on
- a specific frequency, then you might want to construct a separate antenna.
- For casual scanning, forget it. You *can* use an antenna called a "discone"
- to cover the entire frequency range. This is a very wideband antenna design,
- but it has no gain. For the bands where you want to transmit, it's much
- less than ideal.
-
- >I'd heard it said (back in CB days) that a mobile antenna interacts
- >with the vehicle it's mounted on: a center-of-the-roof mount made
- >for a round pattern while a rear-bumper mount makes for a cigar-
- >shaped pattern that leads the vehicle. Is this true? Does this
- >affect whip antennae that drape over the entire vehicle?
-
- Yes, this is true at lower frequencies such as 11 meters and the
- rest of the HF spectrum. It's also *somewhat* true at VHF and UHF,
- but less so. What you need is a groundplane that extends for a
- quarterwave in all directions at the frequency of operation. That's
- basically the entire car at CB, but at 70 cm it's only 6.9 inches.
- Mounting a UHF antenna on the trunk or fender can distort the pattern
- from *shadowing* by the greenhouse and top of the auto, but that's
- a different thing than the issue of groundplane symmetry. Center of
- the top mounting is always preferred when it's mechanically feasible.
-
- Gary
- --
- Gary Coffman KE4ZV |"If 10% is good enough | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | for Jesus, it's good | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | enough for Uncle Sam."| emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | -Ray Stevens |
-
- ------------------------------
-
- Date: 30 Oct 93 16:25:32 GMT
- From: ogicse!uwm.edu!spool.mu.edu!umn.edu!gold.tc.umn.edu!fede0001@network.ucsd.edu
- Subject: Was 'Vanity' Call Signs, now paying for call signs
- To: info-hams@ucsd.edu
-
- In digest <9309307519.AA751992435@sceng.UB.com> Lotus_Mail_Exchange_at_702__HUB@sceng.UB.COM writes:
-
- >faunt@netcom6.Netcom.COM (Doug Faunt N6TQS 510-655-8604) writes:
-
- >>The only valid objection to paying for licensing services from the FCC
- >>that I've heard is that young people will be discouraged by one more
- >>financial barrier to getting and keeping a license.
- >>I think a fee for the license, that goes into the general fund (FCC
- >>expenses come out of the general fund) is a perfectly reasonable
- >>thing. It alos gives us a slight advantage in that we can then state
- >>that we're not getting a complete free ride. How many other countries
- >>have free licensing? I know that the UK license is pretty expensive.
- >>How about others?
-
- >>73, doug
- > I know that in Canada we pay about 25$ per annum for our license.
- >Which is not expensif but not cheap either. Well, it's pretty cheap, I
- >shouldn't complain.
-
-
- >--
- >======================================================================
- >Marc Lombart T'is better to debate without
- >Internet: ranfry@CAM.ORG Resolution, than to resolve
- >Compuserve 70702,1603 Without debate.
-
-
- I think that the five and a half dollars the US pays per license, one
- time fee, is a nice deal. If you successfully pass all your tests,
- it would only cost about $22 dollars to become an EXTRA class license.
- (Considering novice is a free, there's tech, gen, adv, then extra).
-
- Then the only upkeep for it is to send a 610 form to the FCC every ten years.
-
- I don't agree with vanity callsigns, as it would create more work and
- headache for the FCC, which is an already-bogged down system.
-
- ----------------------------------------------------------------
- : Jason Gross (KB0JZP) :
- : Internet: fede0001@gold.tc.umn.edu These views are :
- : FidoNet : Jason Gross (1:282/1014) mine, all MINE! :
- : Packet : KB0JZP@WD0GDB.MN.USA.NOAM :
- ----------------------------------------------------------------
-
- ------------------------------
-
- Date: 30 Oct 93 15:29:14 GMT
- From: mnemosyne.cs.du.edu!nyx!rcanders@uunet.uu.net
- To: info-hams@ucsd.edu
-
- References <dbledsoeCFHryr.1tF@netcom.com>, <CFJ304.Bp5@fc.hp.com>, <jfhCFKJK1.C53@netcom.com>
- Reply-To : rcanders@nyx.UUCP (Mr. Nice Guy)
- Subject : Re: GAY INTERNATIONAL HAM RADIO CLUB
-
- In article <jfhCFKJK1.C53@netcom.com> jfh@netcom.com (Jack Hamilton) writes:
- >perry@fc.hp.com (Perry Scott) wrote:
- >
- >>As I understand the 1st amendment, the ARRL can print whatever they
- >>want. Do the civil rights of LARC exceed those of the ARRL?
- >
- >The ARRL is not an ordinary private citizen. It receives government
- >support (non-profit status) and has some governmental privileges
- >(administering tests, for example).
-
- The ARRL does not discriminate, any one can join.
- Churches also get tax-exempt status
-
- >
- >>: LARC believes that to go ahead and run the advertising without
- >>: resolution of the underlying issue will undermine its own complaint. So,
- >>: until the ARRL will discuss the real issue of discrimination, the issue of
- >>: advertising cannot be resolved.
- >>
- >>What discrimination? The ARRL refused to print my article. Do I get to
- >>sue them too?
- >
- >If the ARRL said "We won't print your article because you're gay/black/
- >jewish", then yes, you should sue.
-
- But they rejected the add because of its _content_ not the sexual
- orientation of the buyer of the add. Because the add was rejected because
- of its content LARC has no ground for suing.
-
- Rod N0NZO
-
- --
- Rod Anderson | "I do not think the United States government
- rcanders@nyx.cs.du.edu | is responsible for the fact that a bunch of
- | fanatics decided to kill themselves"
- Clinton, Gore, gone in four | Slick Willie the Compassionate
-
- ------------------------------
-
- Date: Thu, 28 Oct 1993 19:31:51 GMT
- From: news.kpc.com!amd!netcomsv!netcom.com!jfh@decwrl.dec.com
- To: info-hams@ucsd.edu
-
- References <gregCFIoxD.1Ay@netcom.com>, <dbledsoeCFJK67.FAB@netcom.com>, <22708@news.duke.edu>fh
- Subject : Re: GAY INTERNATIONAL HAM RADIO CLUB
-
- jbs@ee.ee.duke.edu (Joe B. Simpson) wrote:
-
- >Yeah, well, frequently it takes a threat of action to make someone realize they
- >have taken an untenable position. They reversed that position to a reasonable
- >one, now you guys should shut up and get on with your lives. Of course, you
- >won't do that because your main interest is not getting your ad run.
-
- And what do you think their main interest is?
-
- Obviously not publicity, since the number of hams they would reach by having
- their ad run would be much larger than the number of hams who read
- rec.radio.amateur.misc.
-
- Probably not money - there may be some kind of fine involved in the case,
- but I haven't heard it mentioned.
-
- You mentioned political ax-grinding, but I'm not sure what that means in
- this case. What do you think LARC would gain by going up against the ARRL,
- besides having their ad published?
-
- --
-
- ----------------------------------------------------
- Jack Hamilton POB 281107 SF CA 94128 USA
- jfh@netcom.com kd6ttl@w6pw.#nocal.ca.us.na
-
- ------------------------------
-
- Date: Fri, 29 Oct 1993 16:25:30 GMT
- From: library.ucla.edu!agate!linus!linus.mitre.org!wralston.mitre.org!user@network.ucsd.edu
- To: info-hams@ucsd.edu
-
- References <1993Oct27.200502.9559@VFL.Paramax.COM>, <2aopk9$97b@orca.es.com>, <2aosvn$a4@oak.oakland.edu>
- Subject : Re: Is the band dead -- or nobody on?
-
- In article <2aosvn$a4@oak.oakland.edu>, prvalko@vela.acs.oakland.edu
- (prvalko) wrote:
- >
- >
- > Alan Brubaker (alan@olin.es.com) wrote:
- > : In article <1993Oct27.200502.9559@VFL.Paramax.COM> rossi@VFL.Paramax.COM (Pete Rossi) writes:
- > : >I was talking to a friend about how dead the bands seemed lately - 10 meters
- > : >especially, yet we both noted the following:
- >
- > Yup, the bands are dead. Have you noticed how many low band rigs are
- > available at swaps and in the yellow sheets lately? Looks like a lot of
- > people are exchanging Japanese silicon for American greenbacks.
-
- Nah, it just the calm before the storm... the CQWW this weekend!
-
- -- Bill wtr@mitre.org
- * I babble too incoherently to speak for my employer *
-
- ------------------------------
-
- Date: Fri, 29 Oct 1993 15:38:23 GMT
- From: nntp.ucsb.edu!library.ucla.edu!europa.eng.gtefsd.com!howland.reston.ans.net!spool.mu.edu!sgiblab!news.kpc.com!amd!amdahl!netcomsv!netcom.com!jfh@network.ucsd.edu
- To: info-hams@ucsd.edu
-
- References <22708@news.duke.edu>, <jfhCFMGx4.FtK@netcom.com>, <22768@news.duke.edu>edu
- Subject : Re: GAY INTERNATIONAL HAM RADIO CLUB
-
- jbs@ee.ee.duke.edu (Joe B. Simpson) wrote:
-
- >Obviously publicity. If they didn't wan't publicity (not about the
- >existance of their organization, but about their complaint against ARRL)
- >they would submit their ad and shut up. Instead, they're continuing to beat
- >the dead horse and demanding that the ARRL give them coverage in the magazine
- >besides just the ad. They're demanding public apologies and such. Or didn't
- >you see all those demands earlier in this thread?
-
- No, I didn't see a demand for articles. Could you find the posting in
- which someone from LARC says "We demand that QST publish articles about
- us"?
-
- --
-
- ----------------------------------------------------
- Jack Hamilton POB 281107 SF CA 94128 USA
- jfh@netcom.com kd6ttl@w6pw.#nocal.ca.us.na
-
- ------------------------------
-
- Date: Fri, 29 Oct 1993 17:32:27 GMT
- From: mdisea!mothost!merlin.dev.cdx.mot.com!davidk@uunet.uu.net
- To: info-hams@ucsd.edu
-
- References <1993Oct17.233220.19586@ssc.com>, <CF2wpI.vx@news.Hawaii.Edu>, <jlrCFL2rF.4uo@netcom.com>
- Subject : Re: Homonauseated (Was: Newsline #842)
-
-
- Alot of people are turned off by your behavior. Thats
- understandable. People dont have to like you or your
- behavior. Whay do you keep bugging the ARRL for your
- agenda? Why do you keep trashing this news group?
- If you cant muster up enough interest in your own
- news group then give up.
-
- ------------------------------
-
- Date: 30 Oct 93 13:12:36 GMT
- From: ogicse!emory!kd4nc!ke4zv!gary@network.ucsd.edu
- To: info-hams@ucsd.edu
-
- References <931021222641.35c06e65@STDVAX.GSFC.NASA.GOV>, <2am32v$7g@male.EBay.Sun.COM>, <2amlop$c3c@altitude.HIP.CAM.ORG>
- Reply-To : gary@ke4zv.UUCP (Gary Coffman)
- Subject : Re: Spread Spectrum
-
- In article <2amlop$c3c@altitude.HIP.CAM.ORG> ranfry@CAM.ORG (Marc Lombart) writes:
- >keithhar@eb5ts4.EBay.Sun.COM (Keith Hargrove) writes:
- >>Is there a news group for spread spectrum
- >>I would like to do some spread spectrum expermiting
- >>but info on ss seems hard to come by
- >>I see a blip once in a while in a HAM mag but never a working project
- >>and is there a C program to genarate PN codes??
- >
- >>thanks
- >> -Keith N7QLR
- >
- > My knowledge of Spread Spectrum is quite limited, but my
- >understanding is that it would probably not be viable as a HAM node,
- >seeing as it takes many times the normal bandwidth for each "channel."
- >The main use of Spread Spectrum is security, not communication. At
- >least, that is what I know from the little I have found on the subject.
-
- SS can be useful on the ham bands. Rather than operating on a particular
- frequency, SS uses a particular code sequence, or hop sequence to separate
- one signal from another. SS is particularly good in crowded spectrum because
- the signals degrade gracefully as the number of stations active increases
- rather than having the clashes when narrow band signals start to overlap.
-
- SS is legal without special authority on the 70 cm band and above, and
- stations have used it at HF under STAs. The diversity offered by the
- system does wonders for selective fading problems. Since the average
- signal power is spread over an entire band, narrow band users don't
- usually even notice it's there. At worst they see a slight rise in their
- noise floor. The SS user doesn't notice the narrow band users either.
- In PN coding, the amount of time spent at any given frequency is tiny,
- so the percentage of the narrow signal received is also tiny, usually
- manifested as a slight rise in the noise floor of the SS signal. With
- frequency hoppers, the system can automatically skip occupied frequencies.
- This appears as slight dropouts in the SS signal.
-
- To answer Keith's question, get a copy of the ARRL _Spead Spectrum
- Sourcebook_ for the basic outlines of the various types of SS, what
- PN codes are permitted, and the types of equipment modifications needed
- to operate SS. You can convert an IC4AT to a 70 cm hopper, and there
- are plans for building PN spreaders using common off the shelf parts.
- Outfits like Qualcomm have chipsets for complete systems, but if you're
- learning and experimenting, it's probably better to build your first
- units with simple TTL blocks so you'll understand what's happening.
-
- Gary
- --
- Gary Coffman KE4ZV |"If 10% is good enough | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | for Jesus, it's good | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | enough for Uncle Sam."| emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | -Ray Stevens |
-
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- End of Info-Hams Digest V93 #1290
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