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1994-11-13
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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
******************************