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- Date: Sun, 12 Dec 93 18:43:34 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 #1456
- To: Info-Hams
-
-
- Info-Hams Digest Sun, 12 Dec 93 Volume 93 : Issue 1456
-
- Today's Topics:
- 10-Codes used by law enforcement
- 2m meteor skeds wanted
- Daily Summary of Solar Geophysical Activity for 09 December
- Life is too short WITH 2 KW!!!!!
- Scratchi, January, 1960
- TM732A packet hookup???
- Updated Call Sign allocations
- Upgrading from old tech liscense
-
- 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: Fri, 10 Dec 1993 14:52:22
- From: mvb.saic.com!unogate!news.service.uci.edu!usc!howland.reston.ans.net!gatech!destroyer!news1.oakland.edu!rcsuna.gmr.com!revjcs.gmr.com!jsimmer@network.ucsd.edu
- Subject: 10-Codes used by law enforcement
- To: info-hams@ucsd.edu
-
- In article <6m4aec1w165w@opus-ovh.spk.wa.us> bmork@opus-ovh.spk.wa.us (Brian) writes:
-
-
- List of 10-Codes deleted....
-
- Note that this is the suggested use of the 10-codes. If a police department
- rarely gets a 10-89 (bomb threat) they could use it for another purpose.
- They can also disregared the list and make up there own 10-Code.
-
-
- Joe
- jsimmer@cmsa.gmr.com
- >--->Brian
- Mork Internet bmork@opus-ovh.spk.wa.us> . . . . Amateur Radio (AX.25)
- ka9snf@wb7nnf.#spokn.wa.usa>... . .. USMail 6006-B Eaker, Fairchild, WA
- 99011
-
- ------------------------------
-
- Date: 12 Dec 93 18:47:20 GMT
- From: ogicse!emory!swrinde!cs.utexas.edu!howland.reston.ans.net!europa.eng.gtefsd.com!not-for-mail@network.ucsd.edu
- Subject: 2m meteor skeds wanted
- To: info-hams@ucsd.edu
-
- I'm looking for skeds for the Geminids meteor shower....please e-mail
- today or tonight and we can meet on 75m to coordinate.
-
-
- ==== Dave Pascoe KM3T ===================== km3t@mathworks.com ==========
-
- ------------------------------
-
- Date: Thu, 9 Dec 1993 21:06:58 MST
- From: pacbell.com!sgiblab!swrinde!cs.utexas.edu!math.ohio-state.edu!news.cyberstore.ca!nntp.cs.ubc.ca!alberta!adec23!ve6mgs!usenet@network.ucsd.edu
- Subject: Daily Summary of Solar Geophysical Activity for 09 December
- To: info-hams@ucsd.edu
-
- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
-
- DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
-
- 09 DECEMBER, 1993
-
- /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
-
- (Based In-Part On SESC Observational Data)
-
-
- SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 09 DECEMBER, 1993
- ------------------------------------------------------------
-
- !!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 343, 12/09/93
- 10.7 FLUX=098.4 90-AVG=097 SSN=079 BKI=0000 0001 BAI=000
- BGND-XRAY=B1.5 FLU1=1.4E+05 FLU10=1.1E+04 PKI=2212 2212 PAI=006
- BOU-DEV=004,004,004,002,002,002,002,005 DEV-AVG=003 NT SWF=00:000
- XRAY-MAX= B4.9 @ 0215UT XRAY-MIN= B1.3 @ 2359UT XRAY-AVG= B1.8
- NEUTN-MAX= +002% @ 0635UT NEUTN-MIN= -002% @ 2345UT NEUTN-AVG= -0.2%
- PCA-MAX= +0.1DB @ 0955UT PCA-MIN= -0.4DB @ 1335UT PCA-AVG= -0.0DB
- BOUTF-MAX=55354NT @ 0201UT BOUTF-MIN=55341NT @ 1747UT BOUTF-AVG=55350NT
- GOES7-MAX=P:+000NT@ 0000UT GOES7-MIN=N:+000NT@ 0000UT G7-AVG=+067,+000,+000
- GOES6-MAX=P:+118NT@ 1939UT GOES6-MIN=N:-075NT@ 0952UT G6-AVG=+088,+028,-048
- FLUXFCST=STD:095,095,095;SESC:095,095,095 BAI/PAI-FCST=005,010,010/010,015,015
- KFCST=1112 3211 1223 4211 27DAY-AP=005,008 27DAY-KP=2221 2111 2132 3221
- WARNINGS=
- ALERTS=
- !!END-DATA!!
-
- NOTE: The Effective Sunspot Number for 08 DEC 93 was 37.0.
- The Full Kp Indices for 08 DEC 93 are not available.
-
-
- SYNOPSIS OF ACTIVITY
- --------------------
-
- Solar activity was very low. Flare activity was minimal.
- A new region may be coming into view near N07, but it is as yet
- unnumbered.
-
- Solar activity forecast: solar activity is expected to be
- very low.
-
- STD: A full-disk Yohkoh x-ray image has been appended to this
- report which shows the increased emissions near N07 and a
- narrow southern-hemisphere coronal hole which has not yet fully
- rotated into view around the west limb.
-
- The geomagnetic field was quiet. Yesterday's storm abruptly
- gave way to the very quiet conditions seen now.
-
- Geophysical activity forecast: the geomagnetic field is
- expected to be quiet to unsettled.
-
- Event probabilities 10 dec-12 dec
-
- Class M 01/01/01
- Class X 01/01/01
- Proton 01/01/01
- PCAF Green
-
- Geomagnetic activity probabilities 10 dec-12 dec
-
- A. Middle Latitudes
- Active 15/15/15
- Minor Storm 05/05/05
- Major-Severe Storm 01/01/01
-
- B. High Latitudes
- Active 15/20/20
- Minor Storm 10/10/10
- Major-Severe Storm 01/01/01
-
- HF propagation conditions were near-normal over all
- regions. However, global MUFs are depressed between 20 and 30
- percent below normal. Similar conditions are expected to
- persist over the next 72 hours, through 12 December inclusive.
- There are still reports of VHF openings in the Australian
- regions. FM reception was reported in Brisbane and Pakenham on
- frequencies as high as 100 MHz. These openings are likely the
- result of persistent sporadic-E.
-
-
- COPIES OF JOINT USAF/NOAA SESC SOLAR GEOPHYSICAL REPORTS
- ========================================================
-
- REGIONS WITH SUNSPOTS. LOCATIONS VALID AT 09/2400Z DECEMBER
- -----------------------------------------------------------
- NMBR LOCATION LO AREA Z LL NN MAG TYPE
- 7627 S15W51 108 0000 AXX 00 001 ALPHA
- 7629 S21W26 083 0090 CAO 09 014 BETA
- 7630 S09W27 084 0080 CAO 09 012 BETA
- 7631 N15W17 074 0000 AXX 01 001 ALPHA
- 7632 N07E72 345 0000 AXX 01 001 ALPHA
- REGIONS DUE TO RETURN 10 DECEMBER TO 12 DECEMBER
- NMBR LAT LO
- NONE
-
-
- LISTING OF SOLAR ENERGETIC EVENTS FOR 09 DECEMBER, 1993
- -------------------------------------------------------
- BEGIN MAX END RGN LOC XRAY OP 245MHZ 10CM SWEEP SWF
- NO EVENTS OBSERVED
-
-
- POSSIBLE CORONAL MASS EJECTION EVENTS FOR 09 DECEMBER, 1993
- -----------------------------------------------------------
- ISOLATED HOLES AND POLAR EXTENSIONS
- EAST SOUTH WEST NORTH CAR TYPE POL AREA OBSN
- 53 S30E72 S30E72 S08E30 S04E44 011 ISO NEG 010 10830A
-
-
- SUMMARY OF FLARE EVENTS FOR THE PREVIOUS UTC DAY
- ------------------------------------------------
-
- Date Begin Max End Xray Op Region Locn 2695 MHz 8800 MHz 15.4 GHz
- ------ ---- ---- ---- ---- -- ------ ------ --------- --------- ---------
- 08 Dec: 0146 0151 0156 C1.0 SF 7629 S22E01
- 0429 0433 0435 B3.9
- 0548 0558 0604 B6.2
- 0921 0925 0928 B3.4
- 0930 0941 0948 C1.8 SF 7629 S22W04
- 1012 1018 1023 B6.9 SF 7627 S24W21
- 1129 1134 1136 B5.6
- 1215 1218 1220 B6.3
- 1223 1226 1231 B4.8
- 1458 1503 1508 B7.9 SF 7629 S22W08
- 1756 1800 1803 B3.5 SF 7629 S21W08
- 1819 1823 1827 B3.0
- 1937 1941 2013 B8.3 SF 7630 S10W11
- B2053 U2053 A2056 SF 7629 S21W09
-
-
- REGION FLARE STATISTICS FOR THE PREVIOUS UTC DAY
- ------------------------------------------------
-
- C M X S 1 2 3 4 Total (%)
- -- -- -- -- -- -- -- -- --- ------
- Region 7627: 0 0 0 1 0 0 0 0 001 ( 7.1)
- Region 7629: 2 0 0 5 0 0 0 0 005 (35.7)
- Region 7630: 0 0 0 1 0 0 0 0 001 ( 7.1)
- Uncorrellated: 0 0 0 0 0 0 0 0 007 (50.0)
-
- Total Events: 014 optical and x-ray.
-
-
- EVENTS WITH SWEEPS AND/OR OPTICAL PHENOMENA FOR THE LAST UTC DAY
- ----------------------------------------------------------------
-
- Date Begin Max End Xray Op Region Locn Sweeps/Optical Observations
- ------ ---- ---- ---- ---- -- ------ ------ ---------------------------
- NO EVENTS OBSERVED.
-
- NOTES:
- All times are in Universal Time (UT). Characters preceding begin, max,
- and end times are defined as: B = Before, U = Uncertain, A = After.
- All times associated with x-ray flares (ex. flares which produce
- associated x-ray bursts) refer to the begin, max, and end times of the
- x-rays. Flares which are not associated with x-ray signatures use the
- optical observations to determine the begin, max, and end times.
-
- Acronyms used to identify sweeps and optical phenomena include:
-
- II = Type II Sweep Frequency Event
- III = Type III Sweep
- IV = Type IV Sweep
- V = Type V Sweep
- Continuum = Continuum Radio Event
- Loop = Loop Prominence System,
- Spray = Limb Spray,
- Surge = Bright Limb Surge,
- EPL = Eruptive Prominence on the Limb.
-
-
- SPECIAL INSERT: CURRENT X-RAY EMISSIONS FROM THE JAPANESE YOHKOH SPACECRAFT
- ===========================================================================
-
- 08 December 1993, 20:10 UTC
-
- North
- .....,,,,,,........... .. .. .... .
- .........,,,::::;;;;;::,,,,,,,,......... ...,,,,....... .
- ..........,,,::;;;;;;::::,,,,,,,,,,,,,,,,,,.... ...,,,,,..... ..
- ........,,:::;;-;;:,:,,,,,,,,,,....,,:;,,,...,,,...,.,,,,,,::,,,,,,,....
- .....,,,,::;;---:,,,,,,,...,,,,........,.,.,,,,,,,,,,,,,,,,:::;;;;;::,,...
- ...,,,,:;--+++-;::,,,,,,,,,,,...........,,,,,,,,,.....,,,,,,,,,:;;;;;::,,. .
- ..,,,::;;-+++;:;;;;:::::::,,,,,,...,,,,,.,,,,,,,,,...,,,,,,,,,,,:::;+-;--;,...
- .,::;--++++-;;::::::::::,,:,,,,,,,,,,,,.,,,,,,,,,...,,,,,,,,,,,,,,:;+21||-,,...
- ,;;;--+|!!-::::,:::::,,,:,,:::::,,,,,,,,,,,,,,,,,,,,,,,,,.......,,::;!*3!+:,,..
- :;-++|||1+;::::::::::,,,::::::::,,,,,,,,,,,,,,,,,,,,,,,,,,,...,,,,,,::-11|::,,,
- ;-+|!122|;:::::::::::::,:::::::::::,,,,,:,::,:,,::,:::,,,,,,,,.,,:,,,,:-+;:::,,
- +-+!1441-;::,,:::::::::,::::::::::::::::;:::::::::::::,,,,,,,,,,,,,,,,,:;--;;::
- -+|!24*1-;::,:::;:::::::::::::::::;;;::;;;;;;;:::;:::::::::::,,,,,,,,,::-++--;;
- ;-||!34|;;:::::::;:,,,,:::::::::::;;;;;;;;---;;;;;;;:;::::::::::,,,,;;::;!++++-
- +|||!1!-;;:::::,,,,,,,,,,:;;;;-;:::;;;;:;;;---+--;;;;;;;;;;;;:::,,,:::::;!|++++
- ;;--+++-;;::,,,,,:::::::::::::;:::::::;;;-+|!2321|--;;;;;;;;;;::,::::::;-!!!|+-
- ,:;;-++-;;:,,,..,::;:;;;:::::::;:::::;;;-+212*#@4!+--;;;;;;;;;;:::::;;;-+21!|++
- ,,::;-+-;;:,,,..::;;;-;;::::::::::::;----+!13#@#1!||+++++--;;;;:::;;;;-+221!|+;
- .,::;;-+--::,,..:;;--;::::::::::::;-----||!1231|!1111!2441|+-;;;;;;;;+|!*32!|+;
- .,,:;;;--;:,,...,:;::;:::::::::;-;-----|!24***42112223*@@*2!|+-----;--+1221|+-;
- ..,,::;;-;,...,,::;:;;;;;;;;;;;;----;;++|!12#@#*21332###@@#4!++------+!11!!+--;
- ..,,,,:::;:,..,,:::::;;;:;;;;;;;;;;;;;;;;-+|12221112*#@@@@#3!++------|!!!|+--;;
- ...,,,::::;,..,:::::;;;;-;;::;:::;;;;;;--+++|!!11123*#4321||++-----+||++---;;:
- ....,,,,,::,..,,,:::;;;;;:::::::;;;;;;-----++++||||!!!|||++-----++++++---;;;:
- ........,,,,..,,,,,,::::,:,:::::::;:;;;;;--;;;---------------+--+----;;;;;:
- ...,,,,,,,,,,,,:::::::::::;::;;;;;;;;;;;;;;;;;--++------;;;;;::::
- ...,,,,,::;;:::::::;;;;;;;;;;;;;;;;;;;;;---+------;;;;::::::,,
- .....,,,::::::;;;;;;;;;----;;;;;--++++++----;;;;;::::,,,,,
- ......,,::,,,::;;;;;;;;--+++++----;;;:::::,,,,...
- . ........,,::::::::;;;;;;;;;;;:::,,,,......
- . .....,,,,,,,,,,,,,::,,,,,..... .
- .................. .
-
- South
-
- KEY: East and west limbs are to the left and right respectively. Emission
- strength, from minimum to maximum are coded in the following way:
-
- [space] . , : ; - + | ! 1 2 3 4 * # @
-
- Units used are arbitrary, for illustrative purposes. Get "showasc.zip"
- from "pub/solar/Software" at the anonymous FTP site: xi.uleth.ca
- (IP # 142.66.3.29) to view these images on VGA screens.
-
-
- ** End of Daily Report **
-
- ------------------------------
-
- Date: Fri, 10 Dec 1993 13:41:59 GMT
- From: pacbell.com!sgiblab!sdd.hp.com!col.hp.com!news.dtc.hp.com!hplextra!hplb!hpwin052!hpqmoea!dstock@network.ucsd.edu
- Subject: Life is too short WITH 2 KW!!!!!
- To: info-hams@ucsd.edu
-
- Gregory Lapin (lapin@casbah.acns.nwu.edu) wrote:
-
- : Do QRP operators live longer than QRO operators?
-
- Probably.
-
- It just depends how careful each is when working on live equipment
-
-
- <8*)X
-
-
- (Boffo-the-clown smiley is easy, but without the revolving bow-tie
- squirting water, seems to lack something)
-
-
- You can still get a painful burn from an overrun 2N3866
-
- Cheers
- David GM4ZNX
-
- ------------------------------
-
- Date: Thu, 09 Dec 93 13:53:12 PST
- From: netcomsv!netcomsv!micromed!brett@decwrl.dec.com
- Subject: Scratchi, January, 1960
- To: info-hams@ucsd.edu
-
- dm_johnson@dave.enet.dec.com (Dennis Johnson) writes:
-
- >
- >
- > Greg,
- >
- > Myron should not have to explain intent until true offense, not pc offense,
- > has been indicated. By your intent we should disallow reproductions of bible
- > text because they slur certain pc categories.
- >
- > Dj
-
-
- HELLO??
- You sure you guys have the right newsgroup?
-
- --
- brett@micromed.com (brett miller)
-
- ------------------------------
-
- Date: Sun, 12 Dec 1993 01:57:37 GMT
- From: agate!howland.reston.ans.net!vixen.cso.uiuc.edu!moe.ksu.ksu.edu!osuunx.ucc.okstate.edu!ki5zw!corey@ames.arpa
- Subject: TM732A packet hookup???
- To: info-hams@ucsd.edu
-
- does anyone know how to make a packet cable for the
- kenwood TM 732A? I would sure appreciate some information
- on this...
-
- Thanks in advance...
-
- Corey Croci AB5IM
- corey@ki5zw.ampr.org
-
- ------------------------------
-
- Date: 12 Dec 93 10:36:52 GMT
- From: ogicse!uwm.edu!vixen.cso.uiuc.edu!moe.ksu.ksu.edu!abc.ksu.ksu.edu!news@network.ucsd.edu
- Subject: Updated Call Sign allocations
- To: info-hams@ucsd.edu
-
- Hello all! I was wondering if anyone happens to have an updated copy of the
- call sign allocations taking into account all the world's changes over the last
- several years....the copy I have access to is a older copy, and still has
- the two Germany's separated. If anyone has this available, or knows where it
- might be available via FTP, please let me know, via either e-mail or posting
- to this group...Thanks!
-
- 73 DE N0YAX
-
- ------------------------------------------------------------------------------
- Jeremy L. Utley | jlu@cygnus.cis.ksu.edu
- Computing & Infomation Sciences | cbr600@matt.ksu.ksu.edu
- Student | cbr600@ksuvm.bitnet
- Kansas State University | bxth85a (Prodigy)
- A.S. Comp. Sci. & Acctg. | N0YAX@N0OER.#NEKS.KS.USA.NA (Packet Radio)
- ------------------------------------------------------------------------------
-
- ------------------------------
-
- Date: 9 Dec 93 08:33:53 EST
- From: sgiblab!swrinde!gatech!howland.reston.ans.net!math.ohio-state.edu!magnus.acs.ohio-state.edu!cis.ohio-state.edu!pacific.mps.ohio-state.edu!ohstpy.mps.ohio-state.edu!miavx1!miavx3.mid.@pacbell.com
- Subject: Upgrading from old tech liscense
- To: info-hams@ucsd.edu
-
- In article <CHLG0M.9ux@hub.cs.jmu.edu>, blaziec@hub.cs.jmu.edu (Christopher Blazie) writes:
- > I earned my technician liscense about 8 or 9 years ago. I became
- > relatively inactive in amateur radio for quite a while, and now
- > I'm getting back into it. When I had my novice liscense, one had
- > only to take the written exam to become a tech; the written exam
- > was the same as the general-class exam. So, when a technician
- > wanted to upgrade to general, all he/she had to do was pass the
- > 13wpm code test. Now, of course, things have changed...I've heard
- > that those of us who had a tech liscense were grandfathered into
- > the new system, i.e. we can still take take the 13wpm test and be
- > upgraded.
-
- That is correct. As long as *you* can prove you held
- a valid Technician license prior to 3/21/87, the only
- requirement (to upgrade to General) is 13 WPM.
-
- > However, when I recently received a new liscense in the
- > mail (just a replacement for the old one, which was lost), there
- > was no designation that I could see that would set my lisense
- > apart from any other (newer) tech liscense.
-
- There is no different designation. An expired license,
- issued prior to 3/21/87 is acceptable proof. A copy of
- that license must accompany the upgrade 610 as well.
-
- > Can someone shed
- > some light on the new regulations? I've heard bits and pieces,
- > but not enough to get a clear idea of what the rules are.
- >
- > Thanks!
- >
- > - Chris/KA3PUF
- >
-
-
- Go for it Chris ... but don't stop 'till you hit Extra!
-
- 73 >< Carl
- K8NHE
-
- ------------------------------
-
- Date: Fri, 10 Dec 1993 13:12:06 GMT
- From: netcomsv!netcom.com!greg@decwrl.dec.com
- To: info-hams@ucsd.edu
-
- References <jchappel.79.755364937@sanders.lockheed.com>, <gregCHrsuv.3Jt@netcom.com>, <jchappel.80.755465269@sanders.lockheed.com>
- Subject : Re: Scratchi, January, 1960
-
- In article <jchappel.80.755465269@sanders.lockheed.com> jchappel@sanders.lockheed.com (Joel Chappell) writes:
- >
- >Greg - This is so typical of liberal behavior. Yes it was the best without
- >really flaming yer butt....
-
- Well, gawwwlleeee. My butt's hottern' a leaky ol' still. What is this,
- the 'Hampshire Hillbillies?
-
- > Now when faced with the truthful part that I
- >wrote, and that is; this is a bit of amateur radio history and was
- >written more than 30 years ago (as pointed out to you by others), you jump
- >to another smart remark and try to raise color as an issue.
-
- Color *IS* the issue, you ignoramus. Look up 'race' in the dictionary.
-
- >Typical liberal way to squirm away from the truth...
-
- Whatsa matter, the PC label didn't work so now you have to tag a 'liberal'
- label on what you can't get your mind around?
-
- > I doubt that Myron had any other motive
- >other than to replay a bit of that history for us.
-
- I already said that. Over, and over, and over... ...but you're so busy
- making mental Dymo labels that you apparently aren't able to read. Hope
- you read engineering specs a little better.
-
- > What do you really know
- >about amateur radio Greg? Do you have a ticket?
-
- Use the call-sign server. I did, and found I've been an active ham
- longer than it suggests you have. You can find the same information,
- at least if you can read the FAQs well enough to glean it. By the
- way, how is your ad hominem argument relevant?
-
- >I have not seen your callsign here.
-
- Then you don't read the net much. No, unlike you, I don't have to put
- all kinds of irrelevant stuff in a .sig file.
-
- > What do you know about life in the USA 40 to 50 years ago?
-
- Are you asking for a transcript?
-
- >What do you know about the person who originally wrote the Scratchi
- >letters? What do you know about his motives? How many other Scratchi
- >letters have you read?
-
- I'd invite you over to see my collection of old ham literature (I've been
- one of those wierd collectors of the stuff since before it was popular.
- Used to pick up QSTs at the local thrift stores.)
-
- > The answer is nothing, not much, zero..zip.
-
- While you're looking up 'race,' look up prejudice. Your refusal to read
- what's written, to label everything and move on, to answer your own questions
- before hearing the answer demonstrates an inclination towards prejudice.
- One wonders how you've managed to have any success as an engineer. Then
- again, it is defense...
-
- > No, you
- >just jumped in with your new age PC crap and raised a lot of issues without
- >doing the research.
-
- Actually, I raised one issue.
-
- > Too many folks use this political correctness to white
- >wash the truth Greg....and that's what I object to.
-
- So why don't you stop painting the truth with a white-wash label you
- call 'political correctness,' and let it stand for what it is... or
- isn't?
-
- > And they use it to
- >rewrite history books and change our social values.
-
- Yep, gotta keep them damn historians from writing all them history books
- all the time. The ones we had wuz good enough. Then along comes all these
- liberals, wantin' to change our social values. Out marching through
- Alabama...
-
- > Now in typical liberal
- >fashion you have me stereo-typed as some sort of bigot.
-
- You've established yourself quite nicely without need of any stereotypes.
-
- > Why I might even be
- >black for all you know,
-
- If you are, you aren't very good at it.
-
- > or a member of some ethnic group
-
- ...which wouldn't stop you from being racist.
-
- > ....but you're so
- >cocked sure about what I found funny about Scratchi..and it can't be good.
-
- I have no idea what you find funny about it. I know what I find funny,
- and not funny, about it. Seems like that in addition to knowing what
- I know you think that you know what I know and what I think you know,
- you know?
-
- >Well Greg..you have no idea what I believe, what I know, what I've done..how
- >well I do it...
-
- You're right. I can only infer from your demonstrated ability to reason
- in a straight line.
-
- Greg
-
- ------------------------------
-
- Date: 12 Dec 93 17:25:21 GMT
- From: ogicse!emory!kd4nc!ke4zv!gary@network.ucsd.edu
- To: info-hams@ucsd.edu
-
- References <CHsMuy.DJH@boi.hp.com>, <1993Dec10.154257.16572@ke4zv.atl.ga.us>, <btobackCHw3wH.99J@netcom.com>
- Reply-To : gary@ke4zv.atl.ga.us (Gary Coffman)
- Subject : Re: Receive broadcast FM on 2m mobile antenna?
-
- In article <btobackCHw3wH.99J@netcom.com> btoback@netcom.com (Bruce Toback) writes:
- >In article <1993Dec10.154257.16572@ke4zv.atl.ga.us> gary@ke4zv.atl.ga.us (Gary Coffman) writes:
- >>Note, a center of roof mount will still work better than the cowl
- >>mount, but [the combined AM/FM/comm antenna] is better than
- >>on-glass or magmount expedients.
- >
- >I have wondered about that. I was about to buy an on-glass dual-band antenna
- >because a sunroof pretty much precludes center-of-roof mounting, and I saw
- >that the claimed antenna gain figures for such antennas were quite respectable.
- >However, assumed that the gain claimed included the loss associated with
- >the mount. Is this not the case? How much loss is associated with the
- >on-glass mount, assuming that the inside portion is properly grounded?
-
- Ok, this definitely falls into the "your mileage may vary" category.
- I've been very unhappy with the results of using on-glass mount antennas
- while some others have claimed satisfactory results. Let's look at the
- theory of these antennas a bit to see if we can pinpoint potential problem
- areas.
-
- On-glass antennas are fed at a voltage node by a capacitive coupling
- made up of the antenna foot, the auto glass, and a small box attached
- to the inner side of the glass. Now to have the antenna end be a voltage
- node, the antenna has to be an even multiple of 1/4 wave electrically
- at the frequency of interest. This is usually done with a physical
- halfwave rod which also has the charm that it doesn't require a groundplane
- to function properly. Since the auto glass isn't well characterized, and
- every individual installation is likely to be different, the inner box
- usually has an adjustment to vary the capacitance for a particular
- installation. This is usually a "flapper" capacitor bent closer or further
- from the glass with a nylon cam. The antenna rod is usually slightly longer
- than a halfwave so it can be shortened by the capacitance to resonance,
- a series LC circuit.
-
- Now since this is a high impedance point, we'd normally expect the
- tuning to be quite sharp, but it usually isn't. In trying to find out
- why not, we discover one of the problem areas of on-glass antennas.
- That's the usually poor decoupling of the coax shield from the antenna
- currents. This results in a hot shield, RF in the cabin, and a poor
- resultant antenna pattern. The reason there is poor decoupling is that
- the "matchbox" is equipped with a wire and little metal tab that's
- supposed to "ground" the shield to the auto body. Unfortunately, this
- doesn't do much good. That's because (1) we're using an antenna that
- doesn't work against ground so this isn't a virtual short at VHF/UHF,
- and (2) because the radio usually isn't well grounded to the body either
- in today's plastic dash cars so that the return likely is via the power
- wiring to the battery and then to the body. So we've got a nasty
- ground loop that includes the coax shield and the window frame.
- The resultant antenna pattern is unlikely to be omni, unlikely to
- have it's major lobe in the horizontal plane, and certainly will
- have less gain than a 5/8 wave antenna mounted securely through
- the center of the top.
-
- The other concern with on-glass antennas is physical. They do tend
- to fall off or get knocked off more frequently than a thru-hole
- mounted antenna. As an example of both problems, I was using an
- Avanti on-glass antenna on 2 meters in a Chevy Monza. One night
- as I was driving down the interstate the rod fell off. I didn't
- notice, and the fellows with whom I was talking didn't notice. That's
- because the coax in the cabin continued to be the primary radiator.
- Note that the dashboard tach always noticed when I was transmitting
- by jumping to 6000 RPM any time I keyed down, whether the rod was
- in place or not.
-
- As I said in the beginning, your mileage may vary, but I'm not
- going to bother with on-glass ham antennas anymore. I either
- drill the hole, or use a magmount expedient.
-
- Gary
- --
- Gary Coffman KE4ZV | I kill you, | gatech!wa4mei!ke4zv!gary
- Destructive Testing Systems | You kill me, | uunet!rsiatl!ke4zv!gary
- 534 Shannon Way | We're the Manson Family | emory!kd4nc!ke4zv!gary
- Lawrenceville, GA 30244 | -sorry Barney |
-
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- End of Info-Hams Digest V93 #1456
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