QRZ! Ham Radio 5/QRZ Ham Radio Callsign Database - Volume 5.iso/digests/infoham/940417.txt

Internet Message Format | 1994-11-13 | 29.8 KB

Date: Fri, 15 Apr 94 02:59:13 PDT
From: Info-Hams Mailing List and Newsgroup <[e-mail]>
Errors-To: [e-mail]
Reply-To: [e-mail]
Precedence: Bulk
Subject: Info-Hams Digest V94 #417
To: Info-Hams


Info-Hams Digest            Fri, 15 Apr 94       Volume 94 : Issue  417

Today's Topics:
      Any experience with doppler rdf (radio direction finders)?
                  ARLB032 Resolution gains majority
                     ARLS019 STS-59/SAREX update
                   callsign.cs.buffalo.edu (2 msgs)
       Daily Summary of Solar Geophysical Activity for 13 April
                      FCC delays and other stuff
                              Freq stds.
                        FT-530 mod  (AGAIN!!)
                         mods for th-78a????
                            Need QSL info.
                      wa8ded firmware needed!!!
         What's the best freq for underground radio? (2 msgs)
                      Working AO-21 with TH-78A

Send Replies or notes for publication to: <[e-mail]>
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Archives of past issues of the Info-Hams Digest are available
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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: 14 Apr 94 22:15:15 GMT
From: hp-cv!hp-pcd!hpcvsnz![e-mail]
Subject: Any experience with doppler rdf (radio direction finders)?
To: [e-mail]

Gary Coffman ([e-mail]) wrote:
: Any system that won't work for that bane of the repeater owner, very
: brief bursts of interference that kerchunk the machine, isn't going to
: cut it as a mobile direction finding technique. The switched doppler
: displays do work for that case, giving at least a general bearing on
: the rosette. Mechanical arrays aren't generally quick enough to catch
: the burst, and any system that depends on a continous pure carrier is
: out the window. (Typically the offender is going to be a late model
: Motorola repeater that keys while the PLL is still sweeping into lock.
: Hunting them down seems to be a regular passtime around here.)

Direction finding is certainly part of the passtime.  A method that
also has promise is "fingerprinting," characterizing the brief
burst in ways that differentiate it from other sources.  A local
repeater here does this; I believe the system is available for
purchase (see small ads in the back of recent QSTs).  If you want
to get really serious about this aspect of the solution, my
employer sells an instrument that can time-capture a tremendous
amount of raw data and allows analysis of the carrier and modulation
to your heart's content.  The carriers and tone modulations have
distinct amplitude and frequency characteristics as a function of
time that differ from one transmitter to another, even for the same
model.  (I believe the operator of the repeater mentioned above
can even lock out responses to particular transmitters based on
this information.  You "kerchunk" a few times, he locks you out,
and you will need a different transmitter to access his repeater--
or get your apology accepted.)

Sorry for the drift from the original topic.

------------------------------

Date: Thu, 14 Apr 1994 18:41:06 GMT
From: ihnp4.ucsd.edu!library.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com![e-mail]
Subject: ARLB032 Resolution gains majority
To: [e-mail]

ARLB032 Resolution gains majority

ZCZC AG96
QST de W1AW
ARRL Bulletin 32  ARLB032
>From ARRL Headquarters
Newington CT  April 12, 1994
To all radio amateurs

SB QST ARL ARLB032
ARLB032 Resolution gains majority

Resolution gains majority

The Amateur Radio Service Joint Resolution, H. J. Res. 199, now has
a majority of the US House of Representatives as cosponsors.  On
April 11, four additions to the list of cosponsors brought the total
to 220, (of which three are non voting delegates).

The four are: Rep. James Talent (R-MO), Del. Eleanor Holmes Norton
(D-DC), Rep. Thomas Ridge (R-PA), and Rep. Don Young (R-AK).

The Resolution seeks formal recognition of the value of Amateur
Radio to the country, would support Amateur Radio as ''national
policy,'' and would encourage rules and regulations to facilitate
Amateur Radio as a public benefit by encouraging new technologies.

Including Resolution sponsor Jim Cooper (D-TN), the total number of
voting sponsors is now 218.  There are currently 434 Representatives
in the House.

More on the Resolution and the League's efforts in Washington were
in April QST, pages 47 to 50.
--
Marc Grant                                           Voice Mail: 214-246-1150
home: [e-mail]     work: [e-mail]          Amateur Radio N5MEI

------------------------------

Date: Thu, 14 Apr 1994 18:42:33 GMT
From: ihnp4.ucsd.edu!galaxy.ucr.edu!library.ucla.edu!news.ucdavis.edu!csus.edu!netcom.com![e-mail]
Subject: ARLS019 STS-59/SAREX update
To: [e-mail]

SB SPACE @ ARL $ARLS019
ARLS019 STS-59/SAREX update

ZCZC AS63
QST de W1AW
Space Bulletin 019  ARLS019
>From ARRL Headquarters
Newington, CT  April 12, 1994
To all radio amateurs

SB SPACE ARL ARLS019
ARLS019 STS-59/SAREX update

With nearly all of the SAREX school contacts successfully completed,
the crew of the Space Shuttle Endeavour may have additional
opportunities for random contacts with the Amateur Radio community.
There have also been dozens of reports from amateurs who have made
successful contact with the robot packet station, W5RRR-1.

As a reminder, all SAREX operation is split.  The Shuttle voice and
packet downlink frequency is 145.55 MHz.  Please, do not transmit on
the downlink frequency.  The worldwide packet transmit frequency is
144.49 MHz.  FM voice transmit frequencies for all areas except
Europe are 144.91, 144.93, 144.95, 144.97 and 144.99 MHz.  The
European voice uplink frequencies are 144.70, 144.75 and 144.80 MHz.
Please, only transmit on the uplink frequency when the Shuttle is
within range of your station.

Crew opportunities for random contacts will be made on a
non-interference basis with other scheduled flight activities and
work.  Look for call signs N5QWL and N5RAX on 2-meter FM voice.

The Shuttle is scheduled to land on Monday, April 18 at 1612 UTC.

Jim Mollica Jr, N2NRD, reported copying these packet beacons from
the Shuttle:

10 April 1994, W5RRR-1>QST  Hi from low Earth orbit.. We had a
great launch, and the radar lab in our payload bay is working well.
We have set up our living and working quarters, and have even had
time to get on 2m voice twice.  Being in space is GREAT.  73, N5QWL

10 April 1994, W5RRR-1>QST  Hello from Endeavour.  The Red Team has
been on duty today.  We are supporting Space Radar Laboratory
operations.  We have seen a huge dust storm in Africa, and a lot of
frozen lakes in Canada.  Earth from orbit looks great.  We are
enjoying the mission and will hand over to the Blue Team in a few
hours.

To obtain a QSL, send your report and QSL to ARRL EAD, STS-59 QSL,
225 Main Street, Newington, CT 06111, USA.  Include the following
information in your QSL or report: STS-59, date, time in UTC,
frequency and mode (FM voice or packet).  In addition, you must also
include an SASE using a large, business-sized envelope if you wish
to receive a card.  The Orange Park Amateur Radio Club in Florida
has generously volunteered to manage the cards for this mission.

The following Keplerian elements reflect the orbit following a
retrograde trim burn performed this morning, April 12.

STS-59
1 23042U 94020A   94102.60601196 0.00019765  11068-4  10664-4 0   148
2 23042  56.9943 248.7421 0009326 283.3969  76.6081 16.21184650   526

Satellite: STS-59
Catalog number: 23042
Epoch time:      94102.60601196         (12 APR 94   14:32:39.43 UTC)
Element set:     GSFC-014
Inclination:       56.9943 deg
RA of node:       248.7421 deg          Space Shuttle Flight STS-59
Eccentricity:    0.0009326                  Keplerian Elements
Arg of perigee:   283.3969 deg
Mean anomaly:      76.6081 deg
Mean motion:   16.21184650 rev/day      Semi-major Axis: 6594.4697 Km
Decay rate:       0.20E-03 rev/day2    Apogee  Alt:        222.23 Km
Epoch rev:              52              Perigee Alt:        209.93 Km

Thanks to Ron Parise, WA4SIR, of the Goddard Space Flight Center and
Gil Carman, WA5NOM of the NASA Johnson Space Center for the
preceding elements.
--
Marc Grant                                           Voice Mail: 214-246-1150
home: [e-mail]     work: [e-mail]          Amateur Radio N5MEI

------------------------------

Date: 14 Apr 1994 12:37:52 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!vixen.cso.uiuc.edu!newsrelay.iastate.edu!hobbes.physics.uiowa.edu!news.uiowa.edu![e-mail]
Subject: callsign.cs.buffalo.edu
To: [e-mail]

In note <[e-mail]>,
[e-mail] (Charles R. Hohenstein) writes:
>Who maintains the callsign server and how often is it updated? I don't find
>myself there, and I have been licensed for a year. This makes me wonder how
>up-to-date the other information is.

It is not updated unless someone donates the CD-ROM. There is another calssign
server that has newer info. It can be reached at pc.usl.edu 2000. Try that one
it even has my correct address on it.

---
_________________________________________
The opinions in this post are mine and my cat's, not my employer's.
[e-mail]  (Scott F. Migaldi)

------------------------------

Date: 14 Apr 1994 00:04:36 GMT
From: sgiblab!swrinde!cs.utexas.edu!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!eff!news.kei.com!yeshua.marcam.com!zip.eecs.umich.edu!newsxfer.itd.umich.edu!news1.oakland.edu!@
Subject: callsign.cs.buffalo.edu
To: [e-mail]

Who maintains the callsign server and how often is it updated? I don't find
myself there, and I have been licensed for a year. This makes me wonder how
up-to-date the other information is.

------------------------------

Date: Wed, 13 Apr 1994 21:42:56 MDT
From: ihnp4.ucsd.edu!library.ucla.edu!europa.eng.gtefsd.com!news.umbc.edu!eff!news.kei.com!yeshua.marcam.com!zip.eecs.umich.edu!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!alberta!ve6mgs!usenet@@
Subject: Daily Summary of Solar Geophysical Activity for 13 April
To: [e-mail]

                /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

                 DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY

                                 13 APRIL, 1994

                /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\

                  (Based In-Part On SESC Observational Data)


SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 13 APRIL, 1994
---------------------------------------------------------

!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 103, 04/13/94
10.7 FLUX=073.9  90-AVG=095        SSN=021      BKI=3453 3443  BAI=023
BGND-XRAY=A1.0     FLU1=4.6E+05  FLU10=9.8E+03  PKI=3454 3444  PAI=025
  BOU-DEV=031,046,071,021,031,050,055,038   DEV-AVG=042 NT     SWF=00:000
 XRAY-MAX= B2.4   @ 0342UT    XRAY-MIN= A1.0   @ 2011UT   XRAY-AVG= A4.1
NEUTN-MAX= +002%  @ 1320UT   NEUTN-MIN= -002%  @ 0955UT  NEUTN-AVG= +0.1%
  PCA-MAX= +0.1DB @ 2235UT     PCA-MIN= -0.3DB @ 0540UT    PCA-AVG= -0.0DB
BOUTF-MAX=55346NT @ 0218UT   BOUTF-MIN=55284NT @ 1739UT  BOUTF-AVG=55326NT
GOES7-MAX=P:+000NT@ 0000UT   GOES7-MIN=N:+000NT@ 0000UT  G7-AVG=+077,+000,+000
GOES6-MAX=P:+135NT@ 1907UT   GOES6-MIN=N:-101NT@ 0500UT  G6-AVG=+095,+029,-045
 FLUXFCST=STD:095,090,085;SESC:095,090,085 BAI/PAI-FCST=015,010,010/022,015,010
    KFCST=3344 4332 2225 4221  27DAY-AP=032,018   27DAY-KP=4555 4343 4442 3223
 WARNINGS=*GSTRM;*AURMIDWCH
   ALERTS=
!!END-DATA!!

NOTE: The Effective Sunspot Number for 12 APR 94 was  13.9.
      The Full Kp Indices for 12 APR 94 are: 5- 5- 5- 3o   3+ 3- 4- 4-
      The 3-Hr Ap Indices for 12 APR 94 are:  37  38  37  17  17  14  24  21
      Greater than 2 MeV Electron Fluence for 13 APR is: 2.5E+09


SYNOPSIS OF ACTIVITY
--------------------

             Solar activity was very low. Region 7700 (N09E07)
       grew slightly in white light, and now shows a modest degree of
       magnetic complexity. Little activity of any significance was
       reported during the period.

            Solar activity forecast:  solar activity is expected to be
       very low.

            The geomagnetic field was at unsettled to minor storm levels.
       The greater than 2 MeV electron fluence was very high.

            Geophysical activity forecast:  the geomagnetic field is
       expected to be unsettled to active the next 24 hours,
       signalling what should be the end of the disturbance that
       began 01 April. Strictly unsettled conditions will close
       the interval.

            Event probabilities 14 apr-16 apr

                             Class M    01/01/01
                             Class X    01/01/01
                             Proton     01/01/01
                             PCAF       Green

            Geomagnetic activity probabilities 14 apr-16 apr

                        A.  Middle Latitudes
                        Active                30/30/15
                        Minor Storm           20/20/10
                        Major-Severe Storm    10/10/05

                        B.  High Latitudes
                        Active                25/30/30
                        Minor Storm           30/20/20
                        Major-Severe Storm    05/10/10

            HF propagation conditions were below-normal over all
       regions.  The long-awaited improvements in propagation should
       begin to be observed over the next 24 to 48 hours.  However,
       high and polar latitudes can still expect periods of minor
       signal degradation, particularly during the local night
       sectors.  All regions can expect below-normal MUFs due to the
       weak state of the ionosphere and low level of solar ionizing
       radiation.


COPIES OF JOINT USAF/NOAA SESC SOLAR GEOPHYSICAL REPORTS
========================================================

REGIONS WITH SUNSPOTS. LOCATIONS VALID AT 13/2400Z APRIL
--------------------------------------------------------
NMBR LOCATION  LO  AREA  Z   LL   NN MAG TYPE
7700  N09E07  203  0030 CRO  05  011 BETA
REGIONS DUE TO RETURN 14 APRIL TO 16 APRIL
NMBR LAT    LO
7696 S16   096


LISTING OF SOLAR ENERGETIC EVENTS FOR 13 APRIL, 1994
----------------------------------------------------
BEGIN  MAX  END  RGN   LOC   XRAY  OP 245MHZ 10CM   SWEEP
NONE


POSSIBLE CORONAL MASS EJECTION EVENTS FOR 13 APRIL, 1994
--------------------------------------------------------
 BEGIN        MAX      END     LOCATION   TYPE   SIZE  DUR  II IV
     NO EVENTS OBSERVED


INFERRED CORONAL HOLES. LOCATIONS VALID AT 13/2400Z
---------------------------------------------------
               ISOLATED HOLES AND POLAR EXTENSIONS
      EAST   SOUTH  WEST   NORTH  CAR  TYPE  POL  AREA   OBSN
75   N22W19 N10W31 N10W43 N28W21  238  ISO   NEG   007 10830A
76   S40E54 S40E54 N04W02 N29E45  186  ISO   POS   038 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
------  ----  ----  ----  ----  -- ------ ------  --------- --------- ---------
12 Apr:B2136 U2136 A2145        SF  7700  N08E20


REGION FLARE STATISTICS FOR THE PREVIOUS UTC DAY
------------------------------------------------

                C   M   X     S   1   2   3   4   Total   (%)
               --  --  --    --  --  --  --  --    ---  ------
  Region 7700:  0   0   0     1   0   0   0   0    001  (100.0)
Uncorrellated: 0   0   0     0   0   0   0   0    000  ( 0.0)

 Total Events: 001 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.


**  End of Daily Report  **

------------------------------

Date: 14 Apr 1994 19:00:41 GMT
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!wupost!crcnis1.unl.edu!unlinfo.unl.edu![e-mail]
Subject: FCC delays and other stuff
To: [e-mail]

An interesting way of looking at the delay problem...if the delay is
always 10 to 12 weeks, and is not getting continuously longer, then
the FCC must be keeping up with incoming applications.  If they were
not keeping up, then the delay would always be increasing.  If they
are in fact keeping up and just have a backlog, then maybe they should
just make an effort to catch up and then they could go back to keeping
up, but with less of a delay.  Is this too simple to be correct???

Fortunately, I'm just waiting for an upgrade, but I do get tired of
being "temporary AA".  Then again, my wife is still waiting for her
first ticket, and getting impatient...

Greg  WB0RTK
Patient, not complaining, just musing...

------------------------------

Date: 14 Apr 94 04:01:32 GMT
From: agate!netsys!pagesat.net!news.cerf.net!ihnp4.ucsd.edu!news.acns.nwu.edu!news.eecs.nwu.edu!fidogate.nuars.nwu.edu!nwugate.fidonet.org!f747.n115.z1.fidonet.org![e-mail]
Subject: Freq stds.
To: [e-mail]

How good do you think a network feed, such as
CBS off of satellite TV would be?

-Fred M. Spinner, KA9VAW
[e-mail] or [e-mail]

------------------------------

Date: 14 Apr 1994 03:32:42 GMT
From: yale.edu!noc.near.net!chaos.dac.neu.edu!chaos.dac![e-mail]
Subject: FT-530 mod  (AGAIN!!)
To: [e-mail]

In article <2oh14v$[e-mail]> [e-mail] (John Derry) writes:

   Path: chaos.dac.neu.edu!grapevine.lcs.mit.edu!uhog.mit.edu!sgiblab!swrinde!cs.utexas.edu!howland.reston.ans.net!vixen.cso.uiuc.edu!usenet.ucs.indiana.edu!master.cs.rose-hulman.edu!news
   From: [e-mail] (John Derry)
   Newsgroups: rec.radio.amateur.misc
   Date: 13 Apr 1994 14:55:27 GMT
   Organization: Rose-Hulman Institute of Technology
   Lines: 20
   Reply-To: [e-mail] (John Derry)
   NNTP-Posting-Host: d211-1.nextwork.rose-hulman.edu

   Howdy,

   *****     Here is another request for the FT-530 mod. *****

   I know it's been beat to death on this group and I previously had it
   promised to me by a friend, but he lost his information.

   So, I'll appreciate your help.

   Please reply to me at

         [e-mail]

      or     J. H. Derry
         810 S. 34th Street
         Terre Haute  IN  47803

   Thanks in advance.

   GL es 73 de Jack, K9CUN




One more reminder to all:

There are MANY, MANY mods available on the Boston Amateur Radio Club's
ham radio archive area on oak.oakland.edu:/pub/hamradio/mods

The directory structure breaks down from here according to manufacturer.

See the 00-Index.txt file in /pub/hamradio


Hope this helps. :)

73,
Scott, WY1Z
--
===============================================================================
| Scott Ehrlich           Amateur Radio: wy1z      AMPRnet: [e-mail] |
| Internet: [e-mail]   BITnet: wy1z@NUHUB    AX.25: [e-mail] |
|-----------------------------------------------------------------------------|
|       Maintainer of the Boston Amateur Radio Club hamradio FTP area on      |
|            the World - ftp.std.com     pub/hamradio                |
===============================================================================

------------------------------

Date: 14 Apr 94 17:25:25 GMT
From: agate!netsys!pagesat.net!news.cerf.net!pravda.sdsc.edu!nic-nac.CSU.net!charnel.net.csuchico.edu!charnel!olivea!sgigate.sgi.com!sgiblab!swrinde!cs.utexas.edu!howland.reston.ans.net!news.@
Subject: mods for th-78a????
To: [e-mail]

Does anyone happen to have the mods for the th-78a?
--
Thomas Jay Pachner -=- Music Major, Bassist, Gamer, and Amateur Operator
University of Wisconsin - Milwaukee
[e-mail] or [e-mail]
Amateur Call Sign:  N9UUJ

------------------------------

Date: 14 Apr 1994 05:32:25 GMT
From: ihnp4.ucsd.edu!agate!howland.reston.ans.net!pipex!sunic!news.funet.fi!news.tele.fi!news.valmet.com!imukala![e-mail]
Subject: Need QSL info.
To: [e-mail]

Does anyone know who the QSL manager (address) for
--EP2MHB
--YI1EYT
--9N1AW (?)
--XX9TZ

Thanks!

---
#  Rauno Lankinen                   )  internet [e-mail]     #
#  OH3NBJ/OH5NBJ                    )  phone    [phone]           #
#  Valmet-Tampella Inc.             )  fax      [phone]            #
#  P.O. BOX 267                     )  telex    22117 TAMEC SF             #
#  SF-33101 TAMPERE, FINLAND        )                                      #

------------------------------

Date: 14 Apr 1994 14:30:23 -0400
From: ihnp4.ucsd.edu!usc!howland.reston.ans.net!news.cac.psu.edu!news.pop.psu.edu!ctc.com!birdie-blue.cis.pitt.edu!dsinc!netnews.upenn.edu!msuinfo!news.mtu.edu!news.mtu.edu!not-for-mail@@.
Subject: wa8ded firmware needed!!!
To: [e-mail]

The club  station here at MTU is trying to convert to FBBS, and we need a
copy of the wa8ded firmware for a TNC-2.  I have seen docs for the TNC-2
version, but they were never bundled with the firmware.  The only copies
of the firmware I have found indicate that they are for a TNC-1 (different
microprocessor).

I think that we are looking for verion 2.1.  If you have a copy, or know
where I can get it, please let me know.  I realize that I could get it
from TAPR, but they want $10 and more time than I really have available.

73 and thanks, please reply by e-mail
---
Ken Friberg                Lord bless this, thine Holy Hand
[e-mail]                Grenade of Antioch, that with it thou
n8pbe@w8yy.#upmi.mi.na            might blow thine enemies to little
icbmnet:  too @#$ far north        bits, in thy mercy.

Geek Code:
GAT d -p+ c+ l- u e(-*) m+ s !n h f g(+-) w+ t--- r y++

------------------------------

Date: 14 Apr 94 20:52:41 GMT
From: dog.ee.lbl.gov!ihnp4.ucsd.edu!library.ucla.edu!news.ucdavis.edu!dale.ucdavis.edu![e-mail]
Subject: What's the best freq for underground radio?
To: [e-mail]

Question:  What would be the best band for radio communication inside
of caves.  I've only tried 2 meters at 5w and had limited success.
Would 6 meters be any better, 10 meters? On two meters I can get
reasonable propagation down long tunnels and through a squeeze or two.
I'm assuming that the signals are doing a lot of bouncing around off of
the rock walls down there.  Also, some caves seem to be a lot better
then others.

Any one have any experience with underground radio?


Timothy McNulty            N6HFS        tjmcnulty@ucdavis

------------------------------

Date: 14 Apr 94 23:54:39 GMT
From: dog.ee.lbl.gov!ihnp4.ucsd.edu!news.cerf.net!ccnet.com!ccnet.com![e-mail]
Subject: What's the best freq for underground radio?
To: [e-mail]

Timothy McNulty ([e-mail]) wrote:
: Question:  What would be the best band for radio communication inside
: of caves.  I've only tried 2 meters at 5w and had limited success.
: Would 6 meters be any better, 10 meters? On two meters I can get
: reasonable propagation down long tunnels and through a squeeze or two.
: I'm assuming that the signals are doing a lot of bouncing around off of
: the rock walls down there.  Also, some caves seem to be a lot better
: then others.

: Any one have any experience with underground radio?


: Timothy McNulty            N6HFS        tjmcnulty@ucdavis

Next time borrow a couple of 1280 MHz portables. You will be surprised at
the propagation even using low power of 100 mw. There is more bounce.
Remember you are inside a waveguide. If the radio wave exceeds the
frequency of the waveguide there will be attenuation. Those mili-meter
waves will travel through a squeeze that is smaller than a large two meter
sized squeeze.

Bob


--
     Bob Wilkins                     work    [e-mail]
 Berkeley, California                home    [e-mail]
     94701-0710                      play    n6fri@n6eeg.#nocal.ca.usa.noam

------------------------------

Date: Thu, 14 Apr 1994 14:53:15 GMT
From: usc!howland.reston.ans.net!europa.eng.gtefsd.com!news.umbc.edu!eff!news.kei.com!yeshua.marcam.com!zip.eecs.umich.edu!newsxfer.itd.umich.edu!nntp.cs.ubc.ca!alberta!@@ihnp4.ucsd.edu
Subject: Working AO-21 with TH-78A
To: [e-mail]

The AO-21 satellite boasts a fine AFC on the uplink receiver.
Working the satellite with your TH-78A set to 435.0125 should not
be a problem, although as the satellite move farther away from you
it may take a half second or so for the AFC to lock on your signal
when you transmit.
73
John Boudreau
VE8EV

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Date: Thu, 14 Apr 1994 09:10:19 GMT
From: ihnp4.ucsd.edu!swrinde!emory!rsiatl!ke4zv![e-mail]
To: [e-mail]

References <[e-mail]>, <[e-mail]>, <[e-mail]>
Reply-To : [e-mail] (Gary Coffman)
Subject : Re: Any experience with doppler rdf (radio direction finders)?

In article <[e-mail]> [e-mail] (Jeff Liebermann) writes:
>In article <[e-mail]> [e-mail] (Gary Coffman) writes:
>
>>4) The wider and flatter the phase bandwidth of the radio, the more precisely
>>it will pass the doppler shift information on to the resolver.
>
>True.  However, the wider the IF, the better chance a signal on an
>adjacent channel will mangle the readings.
>
>>This latter is a problem when using typical ham receivers, so switch speeds
>>are typically held down to 2 kHz or less for a 4 pole array. This corresponds
>
>Nope.  The reason is that the closer the tone is to the center
>carrier frequency (i.e. lower modulation frequency), the less effect
>the effects of the carrier being off frequency.  Group delay
>(phase errors) increases toward the IF filter band edges and
>are flattest in the middle.

What I said.

Re Wizard War, those arrays were *huge* fixed arrays to get the
necessary narrow beam. I don't think they'd be much use in a car.

>Another interesting method of direction finding is to use the
>same technique as the satellite (forgot name) which monitors the
>ELT (121.5Mhz) frequency.  It uses doppler shift for locating.
>The satellite follows an exactly known path.  A transmitter on the
>ground creates a doppler shift that changes from high to low as
>the satellite passes.  The rate of change during this transition
>can be used to locate a line of position.
>
>The same method can be done on the ground.  I visualize a GPS
>receiver into a laptop.  The received signal and doppler shift
>are measured exactly while roaring down the freeway.  Increased
>shift means you're approaching the transmitter.  Decreasing means
>you're going away.  The carrier frequency, doppler shift, direction,
>and speed are all known.  The rest is number crunching.

Your car must be faster than mine. The SARSAT is moving at 5 km/s
to get that doppler. Poking along at 0.027 km/s, I'm not going to
generate much doppler shift at 2 meters, fractional Hertz. That's
not going to pass through a typical amateur receiver, nor are typical
PLLs that stable.

Any system that won't work for that bane of the repeater owner, very
brief bursts of interference that kerchunk the machine, isn't going to
cut it as a mobile direction finding technique. The switched doppler
displays do work for that case, giving at least a general bearing on
the rosette. Mechanical arrays aren't generally quick enough to catch
the burst, and any system that depends on a continous pure carrier is
out the window. (Typically the offender is going to be a late model
Motorola repeater that keys while the PLL is still sweeping into lock.
Hunting them down seems to be a regular passtime around here.)

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     |                     |

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End of Info-Hams Digest V94 #417
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