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- Date: Fri, 22 Apr 94 04:30:03 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 V94 #442
- To: Info-Hams
-
-
- Info-Hams Digest Fri, 22 Apr 94 Volume 94 : Issue 442
-
- Today's Topics:
- 10m opening
- AR-Net - Amateur Radio Ne
- Dangerous RF/Microwave fields
- IPS Daily Report - 21 April 94
- What's the best freq for underground radio?
-
- 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: 20 Apr 1994 17:23:02 GMT
- From: ihnp4.ucsd.edu!swrinde!cs.utexas.edu!geraldo.cc.utexas.edu!astro.as.utexas.edu!oo7@network.ucsd.edu
- Subject: 10m opening
- To: info-hams@ucsd.edu
-
- thomasr@acpub.duke.edu (ronald Thomas) asks:
-
- >I'm new, new, new to 10-meters so take this with a grain of salt!!
- >Yesterday afternoon and evening was the best activity I've heard for the
- >last month. Using a trimmed CB mag mount antenna on a steell filing
- >cabinet, I picked up Venezuela, Argentina, Monserat, California, Mexico,
- >Louisiana, and some others.
-
- >I wonder how transient this opening is/will be.
-
-
- After the activity of just a couple of years ago,
- that is what old hands call a dead band...
-
-
- Derek Wills (AA5BT, G3NMX)
- Department of Astronomy, University of Texas,
- Austin TX 78712. (512-471-1392)
- oo7@astro.as.utexas.edu
-
- ------------------------------
-
- Date: 21 Apr 94 03:35:00 GMT
- From: dog.ee.lbl.gov!agate!iat.holonet.net!wwswinc!john.woodstock@ucbvax.berkeley.edu
- Subject: AR-Net - Amateur Radio Ne
- To: info-hams@ucsd.edu
-
- VDDDDD?
- : 3
- GDDDDD4 VDRD? VDD? VDRD? RDD? R B RDD?
- : 3 : : 3 GDD4 : GD : 3 GDBY
- P A P P A P A P PDDY SDDY P AD
- RDDDDD?
- : 3
- GDDDBDY VDD? DRDD? DRD VDD?
- : 3 GDD4 : 3 : : 3
- P ADD P A DPDDY DPD SDDY
- VDDD7 B
- : : 3
- : : 3 RDD? VDRD?
- : : 3 GD :
- P SDDDY PDDY P
-
- AmateurRadio Net (ARnet) is a net dedicated to Amateur Radio
- enthusiasts. If you are an Amateur Radio enthusiast, or any of your
- callers are, this is an echomail network for you. ARnet is replacing an
- older ham radio network that recently folded - RF-Net(tm).
-
- If you would like to get more information about this net, please look
- for the information packet ARNET044.ZIP in any of 3 places:
-
- 1) Channel1
- SaltAir
- Mustang HQ BBS
- Execnet
- The Silicon Garden
-
- 2) Any of the 40+ member systems
-
- 3) FREQ'd from 1:2619/211 using a magic name of ARNET
-
- ARnet is available via QWK & FIDO. Some Hub slots are open, however many
- have been filled over the last 4-6 weeks.
-
- If you have any questions, please contact me.
-
- John Woodstock, N2HAA
- The Silicon Garden
- P.O. Box 436
- Coram, NY 11784
- BBS: 516-736-6662
- FIDO: 1:2619/211
- Internet: SysOp@woodybbs.com
- ---
- ~ TXTBCST 1.3b: ARnet - Ham Radio Info Source
-
- ------------------------------
-
- Date: 20 Apr 94 03:44:55 GMT
- From: sfov1.verifone.com!verifone!steven_h2@uunet.uu.net
- Subject: Dangerous RF/Microwave fields
- To: info-hams@ucsd.edu
-
- Does anyone know what is considered dangerous RF and Microwave signals.
- Somehow I remember that between 100K and 30GHz your not suppose to expose
- human's to more than 194V/meter (the spec could have been either an ANSI,
- IEEE, or OSHA spec).
-
- Anybody know if a spec exists detailing what RF and microwave field strengths
- and frequencies that are considered dangerous?
-
- ------------------------------
-
- Date: 21 Apr 94 23:10:53 GMT
- From: agate!howland.reston.ans.net!pipex!sunic!trane.uninett.no!nac.no!ifi.uio.no!wabbit.cc.uow.edu.au!metro!ipso!rwc@ucbvax.berkeley.edu
- Subject: IPS Daily Report - 21 April 94
- To: info-hams@ucsd.edu
-
- SUBJ: IPS DAILY SOLAR AND GEOPHYSICAL REPORT
- ISSUED AT 21/2330Z APRIL 1994 BY IPS RADIO AND SPACE SERVICES
- FROM THE REGIONAL WARNING CENTRE (RWC), SYDNEY.
- SUMMARY FOR 21 APRIL AND FORECAST UP TO 24 APRIL
-
- No warning is current.
- -----------------------------------------------------------
-
- 1A. SOLAR SUMMARY
- Activity: low
-
- Flares: none.
-
- Observed 10.7 cm flux/Equivalent Sunspot Number : 087/030
-
- 1B. SOLAR FORECAST
- 22 April 23 April 24 April
- Activity Low Low Very low
- Fadeouts None expected None expected None expected
-
- Forecast 10.7 cm flux/Equivalent Sunspot Number : 088/032
-
- 1C. SOLAR COMMENT
- A new solar region is showing growth.
- -----------------------------------------------------------
-
- 2A. MAGNETIC SUMMARY
- Geomagnetic field at Learmonth: quiet to unsettled
-
- Estimated Indices : A K Observed A Index 20 April
- Learmonth 10 3322 2232
- Fredericksburg 08 08
- Planetary 07 10
-
- Observed Kp for 20 April: 3333 2212
-
-
- 2B. MAGNETIC FORECAST
- DATE Ap CONDITIONS
- 22 Apr 10 Quiet to unsettled.
- 23 Apr 10 Quiet to unsettled.
- 24 Apr 10 Quiet to unsettled.
-
- 2C. MAGNETIC COMMENT
- None.
-
- 3A. GLOBAL HF PROPAGATION SUMMARY
- LATITUDE BAND
- DATE LOW MIDDLE HIGH
- 21 Apr normal normal normal
- PCA Event : None.
- 3B. GLOBAL HF PROPAGATION FORECAST
- LATITUDE BAND
- DATE LOW MIDDLE HIGH
- 22 Apr normal normal fair
- 23 Apr normal normal fair
- 24 Apr normal normal fair
- 3C. GLOBAL HF PROPAGATION COMMENT
- Conditions expected to remain normal until April 28.
-
- -----------------------------------------------------------
-
- 4A. AUSTRALIAN REGION IONOSPHERIC SUMMARY
- MUFs at Sydney were near predicted monthly values
-
- Observed T index for 21 April: 39
-
- Predicted Monthly T Index for April is 40.
-
- 4B. AUSTRALIAN REGION IONOSPHERIC FORECAST
- DATE T-index MUFs
- 22 Apr 40 Near predicted monthly values.
- 23 Apr 40 Near predicted monthly values.
- 24 Apr 40 Near predicted monthly values.
-
-
- 4C. AUSTRALIAN REGION COMMENT
- None.
- --
- IPS Regional Warning Centre, Sydney |IPS Radio and Space Services
- email: rwc@ips.oz.au fax: +61 2 4148331 |PO Box 5606
- RWC Duty Forecaster tel: +61 2 4148329 |West Chatswood NSW 2057
- Recorded Message tel: +61 2 4148330 |AUSTRALIA
-
- ------------------------------
-
- Date: Wed, 20 Apr 1994 17:00:30 GMT
- From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!vixen.cso.uiuc.edu!usenet.ucs.indiana.edu!ucs.indiana.edu!reid@network.ucsd.edu
- Subject: What's the best freq for underground radio?
- To: info-hams@ucsd.edu
-
- In article <supervisor.7.766696440@rose-hulman.edu> supervisor@rose-hulman.edu (EE DEPT NOVELL SUPERVISOR) writes:
- >In article <Co9ont.E5n@ucdavis.edu> ez045506@dale.ucdavis.edu (Timothy McNulty) writes:
- >>...
- >>Any one have any experience with underground radio?
- >
- >
- >>Timothy McNulty N6HFS tjmcnulty@ucdavis
- >
- >Tim
- > Many years ago Myself and members of the SISG Southern Indiana
- >Speleo Group (non NSS) took the first magentic cave mapper underground
- >under the direst of emergency siduations. Two men drowned in Showfarm cave
- >in Indiana and we were in the rescue team. We both communicated to the
- >surface, CW, and maped the underground passage with a 2Kc magnetic field.
- >This unit would work thru at least 400 feet of solid limestone.
- > Later Richard Blendz and members of the Bloomington Ind. Grotto NSS
- >Frank Reed, Dwight Hazen and others develouped an Uppersideband 30Khz
- >transceiver system to talk and map to the surface. As K9CUN said there were
- >articles in the NSS news about this. Early 1970,s
- > Don't count on reflections in caves to propogate RF. Cave walls are
- >GREAT absorbers of rf. If we were going to be in a cave for days we would
- >run a fine (near invisable) wire from outside in the trees back thru the
- >cave to base camp. We could talk anywhere in the cave within site of the
- >wire and for a limited distance outside.
- > We did run tests on 80Meters between two caves once CW and heard
- >signals thru @ 1/2 mile of rock.
- >
- >73's Good hamming, Keep your head above water when underground!
- >Dave K9ZCE
-
- Hi Dave!
-
- I've been using "cave radio" since 1969. Mine uses 3.5 kHz CW. Most others
- use VLF below 10 kHz. British and Canadian rigs use SSB between 100 and 200
- kHz. VHF doesn't work well in caves; line of sight + 20 feet is about all
- you can get, with a lot of dead spots. UHF propagates further than VHF
- in cave passages. A friend put the UHF antenna of his crossband-
- repeating rig in a cave (with about 100' of coax) and was able to
- communicate with the outside world from several hundred feet away. VHF
- works reasonably well in open-air pits. Circular polarization would
- probably help in any case.
-
- Cave radio's most useful aspect is its direction-finding ability. It can
- find the surface location above the transmitter, within a few inches, and
- measure depth (+- 5%). Three entrances of the Mammoth Cave system in
- Kentucky were radiolocated.
-
- I read an article in a British mining magazine about a repeater for mine-to=
- surface use; the underground part was a CB rig connected via a balun to a
- long piece of 300-ohm twin lead. It emitted and picked up RF by the "
- leaky feeder" effect. Special leaky coax is made for VHF/UHF systems
- installed in mines and subways (or use the crap that Radio S*** sells :-)
-
- See _73_ magazine, February 1984, p. 42 for an article entitled "Cave Man
- Radio" (not the original title). There is a newsletter called _Speleonics_
- which is about cave radio and other cave-related electronics. Several
- construction articles for cave radios have been published. E-mail for
- details. Don Lancaster mentioned it in his "Hardware Hacker" column and we
- received some letters from nuts who thought "underground radio" meant
- clandestine broadcasting. *(:-)
-
- --
-
- Frank Reid reid@ucs.indiana.edu W9MKV
-
- ------------------------------
-
- Date: 21 Apr 94 17:38:39 GMT
- From: dog.ee.lbl.gov!agate!kabuki.EECS.Berkeley.EDU!kennish@ucbvax.berkeley.edu
- To: info-hams@ucsd.edu
-
- References <2o78j3$o3q@apakabar.cc.columbia.edu>, <STEVE.94Apr19184558@hobbes.vigra.com>, <a10554.766918783@giant>▓
- Subject : Re: Kenwood TH-78A *OR* Yaesu FT-530
-
- In article <a10554.766918783@giant>,
- David Tse <a10554@giant.rsoft.bc.ca> wrote:
- >
- >Only diff. is the Kenwood can do AM in all VHF and UHF (may be not 800 band)
- >but Yaesu can only do it in the 110 to 138MHz?? (Mine Standard C550/C558A
- >can do AM on all VHF but not UHF.)
-
- Not True. Although not documented, if you put a UHF frequency in
- the left side of the FT-530, and enable A3E mode, you will decode
- UHF frequencies in AM mode. Maybe not as convenient. Now, HOW they
- do A3E detection is a kludge. Look at the schizmos and take a look :-)
-
- -ken
-
- ------------------------------
-
- End of Info-Hams Digest V94 #442
- ******************************
-