HAM Radio 3/hamradioversion3.0examsandprograms1992.iso/news/inham07/931.

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Subject: INFO-HAMS Digest V89 #931
To: [e-mail]

INFO-HAMS Digest            Sat, 25 Nov 89       Volume 89 : Issue 931

Today's Topics:
                       * SpaceNews 27-Nov-89 *
       Every one uses them -how do they work?Matching networks-
            scanners and privacy (was Military callsigns)
                             test message
                        The "right to receive"
----------------------------------------------------------------------

Date: 25 Nov 89 02:41:28 GMT
From: att!tsdiag!ka2qhd![e-mail]  (John Magliacane)
Subject: * SpaceNews 27-Nov-89 *

Bulletin ID: SPC91127

                              ---------
                              SpaceNews
                              ---------

                      MONDAY NOVEMBER 27, 1989

SpaceNews originates at KD2BD in Wall Township, NJ, and is distributed weekly
around the world. It is available for UNLIMITED distribution.


* SAREX NEWS *
--------------
Ron Parise, WA4SIR is scheduled to operate a 2-meter packet radio and voice
transceiver from the Space Shuttle next year.  Launch time for STS-35 is
currently set for April 26, 1990 at 05:02 UTC.

Here is a preliminary Keplerian element set for STS-35.  Note that these
elements might change slightly prior to launch due to some new ascent
performance predictions, and are not yet official:

Name   : STS-35
Set #  : JSC-004
Epoch  : 90 116.2618056
Incl   : 28.4867
RAAN   : 120.8747
Eccn   : 1.2355E-03
ArgPer : 10.1548
MeanAn : 355.7859
MeanMo : 15.71276482
Drag   : 2.8E-04
Rev #  : 2
SMA    : 6736.21 Km


* UoSAT-D & E NEWS *
--------------------
In a surprise move last week, the launch of the UoSAT-D & E spacecraft and the
Microsats has been brought forward to 09 January 1990 - due to problems with
the SUPERBIRD satellite that was scheduled for launch in mid-December.  UoSAT-
D & E are now undergoing pre-flight preparations before being shipped (with
the launch integration team) to Paris on 30 Nov and then Kourou on 01 Dec in
readiness for mating to the ASAP on 12 Dec.

UoSAT-D & E have completed RF tests in the screen room at UoS and have been
exposed to low temperature tests in the Clean Room 'freezer'at -20 C.  Marc
Fouquet, designer of the CCD camera on-board UoSAT-E, has been taking 'bench-
mark' images for comparison with orbital images.  Totally 'black' images have
been collected to provide data for image processing using the Transputer Data
Processing Experiment - also on UoSAT-E in collaboration with the European
Space Agency.  The additional solar simulation tests planned for next week
have had to be cancelled due to the advance in departure date, and the
spacecraft are now undergoing final cleaning and assembly in the Clean Room.
Uplink & downlink calibrations in an RF anechoic chamber are planned for next
week - providing that the chamber can be made available within the very tight
schedule.  Numerous visitors from several countries (as well as the UK) have
recently come to UoS to view the new UoSAT spacecraft.


* NEWS FROM JAPAN *
-------------------
Japanese Missions: MUSES-A and MOS-1B

ISAS (Institute of Space and Aeronautical Science) plans to launch MUSES-A,
a Mu Space Engineering Spacecraft, on January 23 or later, which will attain
a swing-by orbit of the moon, following an orbit synchronized with the period
of the moon and changing its orbit by using the gravitational pull of the moon
upon passing by.

NASDA (National Space Development Agency of Japan) plans to launch MOS-1B,
a Marine observation satellite, on February 1 or later, which will observe
oceanographic phenomena, in particular the color and temperature of the ocean
surface. The satellite will be launched by H-1 rocket into a Sun-synchronous
subrecurrent orbit at an altitude of about 900 km.

(Sources: the Asahi Shinbun, November 23, morning edition, and
Science & Technology in Japan, August/September, 1988)

[Story by Yoshiro Yamada]


* PHASE III-D NEWS *
--------------------
AMSAT-DL announced that they have received substantial funding for the Phase
III-D satellite which, as outlined by DJ4ZC's paper presented at the 1988
AMSAT-UK Colloquium, will depart quite radically from its predecessors -- it
is designed to have an RF output of 250 W, will weigh 200 to 400 kg and will
be placed in a high-altitude Molniya orbit, similar to OSCAR-13.


* FEEDBACK WELCOMED *
---------------------
Feedback regarding SpaceNews can be directed to the author (John) via any
of the following paths:

UUCP   : ucbvax!rutgers!petsd!tsdiag!ka2qhd!kd2bd
PACKET : KD2BD @ NN2Z



                 <<< Stay on course......Say YES to Morse! >>>

* SpaceNews * >> Satellite News You Won't Find Everywhere Else << * SpaceNews *



<eof>


--
AMPR : KD2BD @ NN2Z (Neptune, NJ)
UUCP : ucbvax!rutgers!petsd!tsdiag!ka2qhd!kd2bd
       "For every problem, there is one solution which is simple,
       neat and wrong." -- H.L. Mencken

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

Date: 24 Nov 89 15:03:30 GMT
From: hpda!hpwala!hpnjld![e-mail]  (Ed Gilbert tel [phone])
Subject: Every one uses them -how do they work?Matching networks-

> Can any one suggest the network best suited for antenna-matching and perhaps
> briefly explain why and how these networks can transform impedances and perhaps
> how one might go about home-brewing his own??

The most practical matching network for matching a wide range of unbalanced
loads to 50 ohms is the tee network.  Schematically it looks like

                   ----- X1 ------------ X2 --------
                                 |
              Zg                 X3                 Zl
                                 |
                   ---------------------------------

This works best when X1 and X2 are the same type of reactance, and opposite
of X3.  Usually X1 and X2 are capacitors, X3 an inductor, which makes
the overall circuit have a high-pass filter frequency response.  If
X1 and X2 are selected to have capacitive reactance of ~100 ohms
at maximum C, and X3 ~100 ohms at maximum L, you'll be able to match
loads anywhere from 1 ohm to over 1000 ohms at some combinations of
the 3 reactances.  Somewhere I have a C program which cranks out tables
of Zl for 50 ohm Zg while sweeping X1, X2, and X3 over their ranges.
I can dig this up and email to you if you're interested.

                                            Ed Gilbert, WA2SRQ

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

Date: 25 Nov 89 02:56:11 GMT
From: vsi1!daver!lynx![e-mail]  (Neal Woodall)
Subject: scanners and privacy (was Military callsigns)

In article <[e-mail]> bill gunshannon writes:

>....Just for the sake of showing how little the public really knows about
>the technology they use on a day to day basis,  I once overheard the
>beginning of a conversation between 2 family members that started with:
>"Don't tell this to anybody......"  While every scanner freak within a
>8 mile radius listened in!!!!!

I have an even better story than this.....

A friend and her husband live in Dallas. While I was visiting them about
6 months ago, I noticed that they had a cordless phone, and that they used
it as their normal phone, in that the cordless was what they usually
received and made calls with.

I mentined to them that the signals were easily received by anyone with a
scanner and that they should not say anything on the phone they considered
"private". My friend's response: "Oh, the salesman told us this phone has
a special security code, so others cannot use our phone!"

It is obvious that she misunderstood completely what the security code is
for....perhaps the salesman was either a fool or he knowingly misled them
when they purchased the phone. I used my scanner to show them that the
signals were easily received on commercially available gear....they were
shocked!

Two more people who now know the truth!!





Neal

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

Date: 25 Nov 89 09:30:26 GMT
From: usc!pollux.usc.edu![e-mail]  (Kenneth J. Hendrickson)
Subject: test message

This is a test message.  I'm trying out net access from my new account.

In the rare case that original ideas   Kenneth J. Hendrickson    N8DGN
are found here, I am responsible.      Owen W328, E. Lansing, MI 48825
Internet: [e-mail]           UUCP: ...!uunet!pollux!kjh

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

Date: 25 Nov 89 02:40:44 GMT
From: vsi1!daver!lynx![e-mail]  (Neal Woodall)
Subject: The "right to receive"

In article <[e-mail]> [e-mail] writes:

>Phil, there's no way to know if anyone is doing anything illegal in the
>privacy of their own home unless you break in and catch them in the act.
>Does that mean you can use illegal drugs, decode encrypted cable TV or
>tear the "do not remove" tags from mattresses with total disregard for
>the law?

I think that this argument is touching on other issues, such as the issue
of what should be a crime, and what should not be considered criminal.

Personally, I think that any act that does not victimize any individual
should not be considered a crime, and there should certainly not be
legilslation which defines as "criminal" acts where all parties are willing
and consenting adults. This, of course, makes the use or sale of any
drugs by consenting adults not crimes, makes protitution not a crime, and
makes gambling not a crime. Hey, this is supposed to be a "free country"
right? Any act that does not victimize anyone should not be a crime....

Now, listining to any conversation transmitted over the airwaves is not
in any way a "victimization" of another person. Perhaps an individual could
use info overheard on the air to victimize another, and this victimization
should be considered a crime. However, the simple act of listining to a
conversation that is broadcast over the air is NOT in any way a
"victimization" of another, and should not be a crime.

I this view, the decryption of scrambled TV signals (which are boradcast
for commerical and profit motives) without permission of the sender DOES
indeed consitute a "victimization" of the corporation that sends the signals
out for obvious commercial purposes. However, in the case of signals sent
over the air for obvious non-profit purposes (encrypted private or business
communcations), the decryption of signals by an unauthorized person does
NOT NECESSARILY constitute a "victimization" and should not by itself be
considered a criminal act! And please, do NOT confuse a signal sent out
for profit motives (such as encrypted TV signals) with a business
communication.....even though business communicatons may ultimately be
"for the gain of profit", the signal itself is NOT the quantity or subject
of the profit.

As far as removing the "DO NOT REMOVE" labels from matresses....this is the
ultimate example of a stupid law that criminalizes a trival act that most
definitely should NOT be criminalized!

>If it is illegal to wiretap phones, then why should it not be illegal to
>"airtap" cellular phones.

First of all, to tap into a phone, you must somehow gain unauthorized
access to the property of the phone company. This is a victimization
because it is a trespassing. Now, the hypothetical "airtap" that you
suggest is just a simple reception of signals that are passing through
your home and body....you don't need to tresspass on anyone else's
property to get the signal, you simply turn on a radio and tune in the
desired frequency. No victimization, no crime comitted......

>......but if it is not illegal it is de facto legal and therefore, by
>default, approved. I don't like that idea much either.

Gee....maybe you do not like the Bill of Rights, either? This country is
supposed to be "free".....I think that means that any act that is not a
victimization is OK. Maybe you don't agree with this, but it is commonly
accepted that if something is not illegal it IS necessarily legal. To
believe that the only things that are "OK" are what the government allows
is more like a totalitarian system, and not at all "free".




Neal

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

End of INFO-HAMS Digest V89 Issue #931
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