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- Date: Mon, 3 Jan 94 11:33:38 PST
- 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 #1538
- To: Info-Hams
-
-
- Info-Hams Digest Mon, 3 Jan 94 Volume 93 : Issue 1538
-
- Today's Topics:
- "Renewal" batteries -- a note
- atomic clocks in TV networks
- cw waivers
- FFTMORSE
- MFJ vertical
- QSLROUTE ftp address?
- Ramsey kits not too good?
- Strange Antenna (2 msgs)
- TOYOTAS AND MOBILE RIGS
-
- 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: Mon, 03 Jan 1994 09:19:38 -0500
- From: titan.ksc.nasa.gov!k4dii.ksc.nasa.gov!user@ames.arpa
- Subject: "Renewal" batteries -- a note
- To: info-hams@ucsd.edu
-
- In article <1993Dec25.211737.4849@gsm001.mendelson.com>,
- gsmlrn@gsm001.mendelson.com (Geoffrey S. Mendelson) wrote:
- > As for the reverse charging, try placing a diode in series with the 4.5 volt
- > pack.
-
- Geoff-
-
- The reverse-charging problem is caused by normal forward current, once one
- or more cells have reached zero voltage. Therefore, the series-diode
- method won't work. You must determine that the total battery voltage has
- dropped by the amount of one cell's voltage, and stop draining the battery
- when that occurs. (On the other hand, a parallel schotky diode might
- help?)
-
- A problem with the idea of replacing NiCds with the new alkalines, is that
- it is necessary to recharge the alkalines relatively early, in order to
- realize the long life they are claimed to have. By not recharging until
- they reach zero volts, the number of times they can be recharged is
- reduced.
-
- This is opposite of NiCds, which maintain a longer charge-life, when you
- don't recharge until they are nearly exhausted.
-
- 73, Fred, K4DII
-
- ------------------------------
-
- Date: Mon, 3 Jan 1994 15:55:41 GMT
- From: netcomsv!netcom.com!wa2ise@decwrl.dec.com
- Subject: atomic clocks in TV networks
- To: info-hams@ucsd.edu
-
-
-
- ------------------------------
-
- Date: 3 Jan 94 13:51:35 GMT
- From: ogicse!emory!rsiatl!ke4zv!gary@network.ucsd.edu
- Subject: cw waivers
- To: info-hams@ucsd.edu
-
- Note: followups directed to policy.
-
- In article <gPcJFc1w165w@info-gw.mese.com> aragorn@info-gw.mese.com (Chris Craig) writes:
- >> Actually since W is not needed and it not any kind fo a reliable indicator of
- >> technical or operating comptetance I say hurray. CW as a requirement should b
- >> eliminated. It is an outmoded method of communication and is wrothwhile only
- >> fun test of a particular skill. TI has no relavanve whatsoever to competance
- >> any other phase of the hobby. I say that it is jsut taking up too much of the
- >> bands. MUCH more space should be allocated to the efficient digital modes suc
- >> pactor and more communication could be carried out. Even hf packet would be m
- >> better if all were not forced to operate on a very narrow range of frequencie
- >> Come out of the dark ages and into the light.
- >>
- >> gilbaronw0mn@delphi.com
- >
- >So, what are you suggesting?? That there be no test at all??? If so, just
- >go to CB and use it. 11 meters is HF after all! I'm not about to tell you
- >that allocating more space to efficent digital methods is a bad
- >suggestion, actually that's the only constructive piece I saw in your
- >message, but doing away with testing would destroy amateur radio once and
- >for all.
- > Chris Craig
- > KD4HDE
-
- That's not what I read into his statement at all. (Though it would be
- nice if it were formated correctly and spell checked :-)) He's saying
- we should eliminate the irrelevant Morse test. I won't go into whether
- Morse is useful/useless here, my position is well known, but the *test*
- is useless since Morse users must know Morse to use it, by definition.
- So if access is granted to spectrum where Morse is permitted, the operator
- is going to have to gain competence in Morse to use it. Whether there's a
- government test or not is irrelevant since the relevant test is on the air
- operation.
-
- Simply put, those who don't know Morse will do no Morse until/unless
- they learn Morse.
-
- Obviously, the Morse test is not the *only* test required of an amateur.
- So he's not advocating eliminating testing in general. (At least that's
- my interpretation of what he's saying.) Now you may or may not agree with
- me on the following, but I think the current written exams are totally
- inadequate to serve their intended purpose. That purpose is to make sure
- the applicant knows enough to avoid injury to himself or others, knows
- enough to detect, and possibly correct, transmitter faults that could
- cause interference to other services (opening the envelope and finding
- the pink ticket isn't adequate for this purpose), and knows enough to
- operate within the other amateur regulations. That's the sole legitimate
- function of government testing. Since the Morse test doesn't fall under
- that category, it's not a legitimate interest of government.
-
- Gary
- --
- Gary Coffman KE4ZV | You make it, | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | we break it. | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | Guaranteed! | emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | |
-
- ------------------------------
-
- Date: 3 Jan 94 11:26:29
- From: idacrd.ccr-p.ida.org!idacrd!n4hy@uunet.uu.net
- Subject: FFTMORSE
- To: info-hams@ucsd.edu
-
- It does NOT work as it comes with SB, SB PRO, or SB16. It needed a complete
- rewrite of that section. I am communicating these to the author.
-
- Bob
-
- --
- Robert W. McGwier | n4hy@ccr-p.ida.org Interests: ham radio,
- Center for Communications Research | scouts, astronomy, golf (o yea, & math!)
- Princeton, N.J. 08520 | ASM Troop 5700, ACM Pack 53 Hightstown
- (609)-279-6240(v) (609)-924-3061(f)| I used to be a Buffalo . . . NE III-120
-
- ------------------------------
-
- Date: 3 Jan 94 15:00:57 GMT
- From: ogicse!emory!europa.eng.gtefsd.com!howland.reston.ans.net!vixen.cso.uiuc.edu!ux2.cso.uiuc.edu!ignacy@network.ucsd.edu
- Subject: MFJ vertical
- To: info-hams@ucsd.edu
-
- iDoes anybody have experiences with MFJ 10 ft 2m-40m vertical? In
- particular, what is its bandwith on 40m and how efficient is it? I know
- it can't be too efficient but vertical design and lack of radials can
- somewhat compensate for reduced size. I just don't know how much.
- Ignacy Misztal, NO9E
-
- ------------------------------
-
- Date: 3 Jan 1994 13:37:05 GMT
- From: Germany.EU.net!news.dfn.de!server2.rz.uni-leipzig.de!news.uni-jena.de!news.tu-ilmenau.de!prakinf2.PrakInf.TU-Ilmenau.DE!systemtechnik.tu-ilmenau.de!tom@uunet.uu.net
- Subject: QSLROUTE ftp address?
- To: info-hams@ucsd.edu
-
- In article <19931230190929CSMSCST@MVS.OAC.UCLA.EDU>, CSMSCST@MVS.OAC.UCLA.EDU (Chris Thomas) writes:
- |> Could someone tell me the name or IP address of the German
- |> site from which it is possible to FTP "QSLROUTE" updates.
- |> Thanks.
- |> -- 73 de Chris Thomas, AA6SQ (ex-WA6HTJ) (CSMSCST@MVS.OAC.UCLA.EDU)
- up to June 1993 the service is on ftp.tu-ilmenau.de path pub/msdos/ham/qslroutes
- Since then this service is not supported by the editors.
- Please read the following README file from this path.
-
- ------------------------ begin README ------------------------
-
- This directory contains the supplements of "QSL Routes - World Annual of QSL Managers."
- 1993 ff.
- It is edited by Theuberger Verlag, Box 73, D-10122 Berlin, Germany.
- -------------------------------------------------------------------
- Remarks: (18.08.93)
-
- This update services is not longer supported than to June 93 via ftp.
- Owners of the Book get the updates by mail.
-
- If you want to get a free of charge test of "QSL-ROUTES"
- 2nd edition 1992 + supplements 1992 (or 1993 edition if
- 92 is no longer available)
- you can write a letter to:
-
- Theuberger Verlag GmbH
- P.O.Box 73
- D-10122 Berlin
- Germany
-
- You should include 2 US$ or 3 IRC or 3 DM (stamps) at least
- for surface mail and an address label.
- ------------------------ end README ------------------------
-
- Remarks at the end:
-
- I have checked the ftp-logs and watched that a lot of hams
- downloaded that files. But never one emailed me...
- I would provide this service for you in the future but...
- ...the editor told me that he doesnt want to support that
- service by ftp up to the time I will tell him the email adresses
- of a serious number of peoples (hams & netters) who are owner of a book
- "QSL-ROUTES" and those hams express their interest in getting
- the updates by email, maillist, ftp?....
- So: if you are interested in this service email me or mail
- to the editor for a free test.
-
-
- --
- Thomas Planke DL5ATP Planke@Systemtechnik.TU-Ilmenau.DE
- Technical University of Ilmenau Phone: +49 3677/69-1465
-
- ------------------------------
-
- Date: 3 Jan 94 16:13:37 GMT
- From: ogicse!uwm.edu!cs.utexas.edu!math.ohio-state.edu!news.acns.nwu.edu!casbah.acns.nwu.edu!lapin@network.ucsd.edu
- Subject: Ramsey kits not too good?
- To: info-hams@ucsd.edu
-
- In article <757263689snx@skyld.tele.com>,
- Jeffrey D. Angus <jangus@skyld.tele.com> wrote:
- > Gee, it never fails to amaze me.
-
- Attitudes like your's never fail to amaze me, Jeff.
- If we continue to accept garbage, you can be sure that garbage is what we
- will get, at any price.
-
- > "Why doesn't this kit I paid $15.00 for not perform like the
- > $400.00 thing I should have bought instead?"
-
- Check the prices for Ramsey kits. Not too many out there for $15. In
- fact, many of the kits cost little less than an assembled radio.
-
- > Ask a repair shop to show you the innards of a hand held and
- > then see if there is only 2 ics and a dozen parts in there.
- >
- > Look inside a KAM or PK-232 and count the parts.
- >
- > Even the commercially assembled BAYCOM modems by TigerTronics
- > at least have quality parts, pc boards and were soldered properly.
-
- Have you ever used a TigerTronics packet modem? Mine did not work with my
- computer's original COM port because it was driving an RS232 port with TTL
- levels. It was also terribly sensitive to rfi from the computer and
- eventually glitched and burned out the RS232 driver chip on my COM port.
- The packet modem that I homebrewed far outperforms my old TigerTronics.
-
- > Ramsey Kits (and others) are for the entertainment value of playing
- > with something on the bench. They are NOT a substitue/alternative to
- > paying for a quality item that works properly.
-
- This is an attitude that will turn hams into appliance operators PDQ.
- Building kits is not supposed to be just entertainment but should also
- teach some electronics. There is no reason why they should work poorly.
-
- > Yeah, I can hear the old farts now, "What about HeathKit?" I bought them
- > and built them myself. They worked. Some of them worked pretty good. None
- > of them was a direct replacement for a expensive commercial product.
-
- First of all, Jeff, you are older than I am. Yet, most of the contacts
- that I used for DXCC were with Heathkits. Sure, they were no Collins
- S-line but they outperformed other ham gear that cost twice as much. The
- Heathkits, in general, were fine radios and had the added benefit of
- teaching some electronics, too.
-
- > If you're buying a Ramsey kit to play with, fine. Beats hacking around
- > inside an expensive radio. If you're buying a kit to substitute for an
- > expensive radio, you get what you pay for.
-
- No one is asking for kits like Ramsey's to be the top of the line.
- However, it is not too much to expect that the design be viable and the
- proper parts be there. Stories that I have heard include basic design
- flaws, missing parts, and lousy customer service.
-
- One of the raisons d'etre of ham radio is to help train technically
- competent people. Attitudes like this and kits like Ramsey's, that
- discourage potential kit builders, are contrary to this. How can you argue
- that ham radio should exist as you keep chipping away at its basic
- premises?
-
- > Amateur: WA6FWI@WA6FWI.#SOCA.CA.USA.NA | "It is difficult to imagine our
- >Internet: jangus@skyld.tele.com | universe run by a single omni-
- > US Mail: PO Box 4425 Carson, CA 90749 | potent god. I see it more as a
- > Phone: 1 (310) 324-6080 | badly run corporation."
-
- Greg Lapin KD9AZ
- glapin@nwu.edu
-
- ------------------------------
-
- Date: 3 Jan 1994 15:58:14 GMT
- From: nothing.ucsd.edu!brian@network.ucsd.edu
- Subject: Strange Antenna
- To: info-hams@ucsd.edu
-
- It's a cell-phone antenna. Why does it look like that? Well, it
- doesn't get snagged in the car wash brush quite so easily, and it
- doesn't get ripped off by the garage door quite so easily, and it
- looks space age and is less efficient.
- - Brian
-
- ------------------------------
-
- Date: Mon, 3 Jan 1994 17:50:27 +0000
- From: pipex!demon!guitar.demon.co.uk!marcus@uunet.uu.net
- Subject: Strange Antenna
- To: info-hams@ucsd.edu
-
- In article <2g83sh$8p2@agate.berkeley.edu>
- ep208@garnet.berkeley.edu "Charles Woodson" writes:
-
- > A few minutes ago I observed a Mercedes with what appeared to me to
- > be a strange antenna on it. The antenna was just above the rear
- > window, in a location where celular phone antennas are often found.
- > The antenna looked like a loop about 3 cm in diameter, and there was
- > a second loop the same size at 90 degrees to the first one.
-
- Yes, it definitely is a cellular aerial. I have found them in the Maplin
- Electronics catalogue (UK). Height 40mm, freq range 800-1000MHz, so it is
- a broadband quarter wave antenna.
-
- Also, according to this catalogue, the longer aerials (9-10") with the funny
- coil at the bottom provide an extra 4dB gain over the quarter wave ones.
-
- --
- |-----------------------------------------------------------------------------|
- | Marcus Bainbridge | If I had a dollar every time I changed my .sig, |
- | marcus@guitar.demon.co.uk | I wouldn't have to pay the commission charge... |
- |-----------------------------------------------------------------------------|
-
- ------------------------------
-
- Date: 3 Jan 94 14:24:41 GMT
- From: ogicse!uwm.edu!mixcom.com!kevin.jessup@network.ucsd.edu
- Subject: TOYOTAS AND MOBILE RIGS
- To: info-hams@ucsd.edu
-
- I wrote to Toyota Customer Service in California and they sent me
- a "technical application note" (that's what the local dealer called it)
- that was specifically written for radio amateurs.
-
- It was a tiny one-page document with very little of anything technical.
- Mostly a politically-correct disclaimer stating that Toyota does not want
- to ignore the importance of the amateur radio community. They then go on
- to say (in effect): tough shit boys, your on your own! They state that
- all warranties are basically void if you use anything with more power than
- a CB and that if you DO choose to install an amateur radio, it should
- be done by an authorized Toyota service facility!! Like they know any-
- thing about it! There were no comments as to the warranties then being
- good if Toyota installed the rig. Big surprise. ;-)
-
- They did give some obvious (to radio amateurs) advice...
-
- Keep all feed lines at least 10 inches away from any automotive wiring.
-
- If you must cross over automotive wiring, do so at a right-angle.
-
- Mount the antenna at the rear of the car or on the roof.
-
- Run the radios 12VDC supply cable directly to the battery terminals.
- (Fuse the cable at the battery terminals.) Do NOT use any of the
- existing electrical system.
-
- I own a 1991 Toyota Tercel. The Engine Control Unit (ECU) is directly
- behind the AM/FM Radio/Cassette behind the center console. So much
- for mounting the radio up front! :-( The best bet is to get a radio
- with a remote head and mount the main unit in the trunk and the
- antenna using a mag-mount or trunk-lip mount.
-
- Note: I got the same impression regarding Honda and Ford/Mazda when I
- enquired with the service manager. They did not know of any available
- "application notes".
-
- Regardless of the make of the car, I think if you keep all the
- electronics in the rear of the car, you should be OK.
-
- One final anecdote..
-
- A fellow radio amateur has a late-model Ford pick-up. He has a Yaesu
- FT5200 (with the remote head) mounted in the rear of the truck (he
- has a cap on the back). The antenna is on the roof above the cab.
- He says that at high-way speeds, he notices that the truck looses
- speed and runs very rough when he transmits at 50 Watts!
-
- --
- /`-_ kevin.jessup@mixcom.com |
- { }/ Marquette Electronics, Inc | I suport publick skools! ;-)
- \ / Milwaukee, Wisconsin, USA |
- |__*| N9SQB, ARRL, Amateur Radio |
-
- ------------------------------
-
- Date: (null)
- From: (null)
- Rajiv
- aa9ch
- r-dewan@nwu.edu
-
- ------------------------------
-
- Date: (null)
- From: (null)
- Better use WWV.
-
- ------------------------------
-
- Date: Mon, 3 Jan 94 16:11:52 GMT
- From: mnemosyne.cs.du.edu!nyx10!jmaynard@uunet.uu.net
- To: info-hams@ucsd.edu
-
- References <2g83sh$8p2@agate.berkeley.edu>, <1994Jan03.050829.9814@uhura.neoucom.edu>, <2g9famINNsnk@network.ucsd.edu>.cs.d
- Subject : Re: Strange Antenna
-
- In article <2g9famINNsnk@network.ucsd.edu>,
- Brian Kantor <brian@nothing.ucsd.edu> wrote:
- >It's a cell-phone antenna. Why does it look like that? Well, it
- >doesn't get snagged in the car wash brush quite so easily, and it
- >doesn't get ripped off by the garage door quite so easily, and it
- >looks space age and is less efficient.
-
- We're using those on our ambulances for both the cellphone and the 800 MHz
- trunk radio; in addition to the pluses Brian mentions, it doesn't get caught
- in overhanging tree branches and pulled off of the roof.
- --
- Jay Maynard, EMT-P, K5ZC, PP-ASEL | Never ascribe to malice that which can
- jmaynard@oac.hsc.uth.tmc.edu | adequately be explained by stupidity.
- "A good flame is fuel to warm the soul." -- Karl Denninger
-
- ------------------------------
-
- Date: 3 Jan 1994 16:33:06 GMT
- From: swrinde!sdd.hp.com!col.hp.com!srgenprp!news.dtc.hp.com!hpscit.sc.hp.com!rkarlqu@network.ucsd.edu
- To: info-hams@ucsd.edu
-
- References <2g7p56$9s9@crl2.crl.com>, <1994Jan2.212541.3319@cmkrnl>, <2g9gdu$7ed@crl2.crl.com>
- Subject : Re: why 29.94 fps?
-
-
- Jamie Hanrahan, Kernel Mode Systems, San Diego CA writes:
-
- > rticle for a frequency standard derived from a color tv. Soon afterward a
- > letter appeared in the letter column, written by an engineer at
- > one of the better-equipped stations in L.A. He stated that even network-
- > supplied programs taken from a live feed usually go through a time-base
- > corrector at the local station, and that this breaks the "chain of
- > traceability" back to the network's precision frequency standard.
- >
-
- Correct. TV stations are not locked to atomic time.
-
- Rajiv AA9CH writes:
-
- > From what I remember, a Rubidium clock has better short term accuracy than
- > a Cesium clock. The Cesium one is more accurate in the long term. So a
- > Rubidium clock that is compared with a cesium one, say using phase
- > comparison with wwvb, is as accurate as these clocks get - about 1
- > part in 10^12.
-
- A really *good* Rubidium clock like the HP 5065 *does* have better short
- term stability (1 to 100 seconds averaging time) than even the best
- Cesium standard (the HP5071). However, it will drift about a part in
- 1E11 per month. On the other hand, low cost "mini" Rubidium standards
- do not have such great short term stability and they may drift a part
- in 1E10 or more per month. The accuracy of a Rubidium depends on when
- was the last time it was calibrated against a Cesium standard or GPS.
-
- People who want even better short term stability (like JPL) use a
- Hydrogen maser locked to a Cesium. H Masers have 100's of times
- better short term stability than the best Rubidium, but they have long
- term drift due to the teflon container aging.
-
- By the way, there is no requirement for the colorburst frequency to
- have extremely high absolute accuracy. It is merely necessary for it
- to have exactly the right *ratio* to the sound carrier to avoid
- interference. The fact that they couldn't move the frequency of the
- sound carrier (because of the backward compatibility requirement) is
- why the field rate had to be lowered by .1%. (The color burst also
- must have a certain ratio to the field rate, as was previously stated).
-
- The network rubidium clocks never had anything to do with this problem.
- They were used to allow switching between feeds without a *phase* jump.
- They could have run the whole network 1PPM high, for example, without
- a problem, as long as the whole network was the same.
-
- Rick Karlquist N6RK
- rkarlqu@scd.hp.com
-
- ------------------------------
-
- Date: 3 Jan 1994 08:17:02 -0800
- From: gatekeeper.us.oracle.com!barrnet.net!nntp.crl.com!crl2.crl.com!not-for-mail@uunet.uu.net
- To: info-hams@ucsd.edu
-
- References <2g7eua$epl@reznor.larc.nasa.gov>, <2g7p56$9s9@crl2.crl.com>, <1994Jan2.212541.3319@cmkrnl>
- Subject : Re: why 29.94 fps?
-
- Jamie Hanrahan, Kernel Mode Systems (jeh@cmkrnl.com) wrote:
- : In article <2g7p56$9s9@crl2.crl.com>, lreeves@crl.com (Les Reeves) writes:
- : > The colorburst frequency is not only cast in stone-it is extremely accurate.
- : > It is more accurate as a frequency reference than WWV. This is provided
- : > that you are tuned to a network-supplied program.
-
- : Is this still true?
-
- : I have no direct knowledge, but... many years ago (mid-70's if I remember
- : right) one of the hobby electronics mags (I think it was Radio-Electronics) had
- : an article for a frequency standard derived from a color tv. Soon afterward a
- : letter appeared in the letter column (where else :-), written by an engineer at
- : one of the better-equipped stations in L.A. He stated that even network-
- : supplied programs taken from a live feed usually go through a time-base
- : corrector at the local station, and that this breaks the "chain of
- : traceability" back to the network's precision frequency standard.
-
- : (of course, anything that the local taped from a satellite feed for broadcast
- : later is completely divorced from any standards at the network.)
-
- : Also, at that time it was stated that the networks used rubidium-clock
- : frequency standards, which are secondary standards: They're awfully good but
- : they still have to be calibrated against something better. NIST (the folks who
- : run WWV) uses cesium-beam clocks, which are primary standards, needing no
- : calibration for frequency. Have the networks since upgraded to cesium-beam
- : clocks? And, given that the local stations probably haven't, does it matter
- : anyway? Even if they have, they're still "only" as good as NIST's clocks, so
- : why should one over-the-air signal be better than another? (propagation
- : changes on shortwave, maybe?)
-
- I received E-Mail from larson@net.com (reply bounced) stating pretty much
- the same thing you stated above. He mentioned things like TBC/frame synch.
- processors in the loop *and* the effect of doppler from satellite.
- If this is the case, I doubt it matters whether we are talking rubidium or
- cesium-beam; the color burst on a network program would be traceable to
- an inexpensive quartz reference at the local TV station.
-
- The article in Radio Electronics appeared 3-5 years ago, if I remember
- correctly.
-
- ------------------------------
-
- Date: 3 Jan 1994 15:16:47 GMT
- From: galaxy.ucr.edu!library.ucla.edu!agate!howland.reston.ans.net!math.ohio-state.edu!news.acns.nwu.edu!casbah.acns.nwu.edu!rdewan@network.ucsd.edu
- To: info-hams@ucsd.edu
-
- References <2g7eua$epl@reznor.larc.nasa.gov>, <2g7p56$9s9@crl2.crl.com>, <1994Jan2.212541.3319@cmkrnl>edu
- Subject : Re: why 29.94 fps?
-
- In a discussion of use of color burst signal as a timebase, Jamie Hanrahan
- <jeh@cmkrnl.com> wrote:
-
- >
- >Also, at that time it was stated that the networks used rubidium-clock
- >frequency standards, which are secondary standards: They're awfully good but
- >they still have to be calibrated against something better. NIST (the folks who
- >run WWV) uses cesium-beam clocks, which are primary standards, needing no
- >calibration for frequency. Have the networks since upgraded to cesium-beam
- >clocks? And, given that the local stations probably haven't, does it matter
- >anyway? Even if they have, they're still "only" as good as NIST's clocks, so
- >why should one over-the-air signal be better than another? (propagation
- >changes on shortwave, maybe?)
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- End of Info-Hams Digest V93 #1538
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