wb7asr@isosvax.UUCP (Tom Boza, WB7ASR) (11/21/84)
WHAT IS BAUD RATE ?
Baud rate is the basic rate of information exchange. It refers to the
number of changes a signal makes in one second.
The signal changes to off or zero at one second, back to a one at two
seconds, and back to zero at three seconds, and so on. So, after one
second it has changed once, after two seconds it has changed twice.
Hence, it changes one each second and the baud rate is therefore ONE.
For most RTTY found in the amateur bands, the baud rate is 45.45. This
means that each bit of information within each RTTY character is 1/45.45
seconds in duration. Another way to say it is that a 45.45 baud, the
signal changes 45 times in one second. For all the speeds of RTTY, the
following table applies.
BAUDOT SIGNALING RATES AND SPEEDS
---------------------------------------------------------------------------
Signaling Rate Data Pulse Stop Pulse Speeds Common Name
(bauds) (ms) (ms) (wpm)
---------------------------------------------------------------------------
45.45 22.0 22.0 65.00 Western Union;
22.0 31.0 61.33 60 Speed
22.0 33.0 60.61 45 bauds
---------------------------------------------------------------------------
50.00 20.00 30.0 66.67 European;
50 bauds
---------------------------------------------------------------------------
56.92 17.57 25.00 76.68 75 speed
17.57 26.36 75.89 57 bauds
---------------------------------------------------------------------------
74.20 13.47 19.18 100.00 100 speeds
13.47 20.21 98.98 74 bauds
----------------------------------------------------------------------------
100.00 10.00 15.00 133.33 100 bauds
----------------------------------------------------------------------------
NEW 24-Ghz RECORD
A new 24-Ghz record apparently was set on August 11th, when I0SNY/IC8 and
I8YZO/8 established a two-way CW contact spanning 331 km. I8YZO/8 operated
from Mt. Montalto (in the Aspromonte Mts.), in southern Italy, at an
altitude of 1956 meters. I0SNY/IC8, operated from Mt. Epomeo, on the island
of Ischia (off the coast of Naples), was at an altitude of 788 meters.
It'll Never Work 30 DB of GAIN ?
Would it be possible to have an HF antenna with 30db of gain on 20 meters?
What you say, Crazy!!!!
But think, A flashlight has at least 30db of gain. The light shines in all
directions, but the reflector concentrates the light beam down to a fine
cone. If we could build a reflector large enough for 20 meters, we could
do it!
Now, how big would this dish have to be? Let's assume that it would have to
be at least ten wave lengths wide in order to simulate the action of a
flashlight reflector. Let's see, ten times 20 meters would be ten times
about 3.3 feet or 300 feet. Once. I guess it depends on how bad one wants
to simulate a flashlight.
An acre of land is about 220 by 220 feet. Our dish would then be about the
size of one acre! Oh, how high up would we want this rig? Would the dish
work on it's side? Probably not. We would have to elevate it at least a
wave length or so. I think this idea has gotten out of hand. Maybe a computer
would work better, using it to control a dozen verticals. Phase all the
verticals together under program control, thats it. Hm?
TRN TO GIVE PACKET RADIO OVERVIEW
"PACKETEERS" and other interested in knowing more about this exciting new
mode for Amateur communications should tune in to the North American
Teleconference Radio Net on December 2nd, at 2400Z. Two leading authorities
in packet radio technology, Lyle Johnson, WA7GXD, and Harold Price, NK6K,
will give a presentation entitled "Packet Radio Overview and Perspective."
Access to TRN is provided by more than 180 gateway stations, mostly VHF
repeaters, linked to cover virtually every metropolitan area in the U.S.
and much of Canada. In the Phoenix area, tune to 147.240/147.840 Mhz
repeater.
Sponsor for the TRN is the Midway ARC, of Kearney, Nebraska, under the
direction of club President Merlin Feikert, WB0USW, and Net Manager
Timothy Loewenstien, WA0IVW. In the Phoenix area, the Motorola ARC
is the sponsor along with the ARA (Arizona Repeater Association).
NEW FORM 610
Planning to upgrade? Renew? Change your address? Apply for a Novice exam?
If so, you'll be facing a new FCC form 610. Although Volunteer Examiners
will have a big hand in filling out the recently revised form, the
applicant's portions have not changed significantly. The new forms are
available for a business size S.A.S.E. from FCC in Gettysburg and all
FCC field bureaus.
DECEMBER IS THE MONTH FOR BIG CONTESTS
ARRL 160 meter CW Contest, from 2200 UTC November 30 to 1600 UTC December 2nd.
ARRL 10 meter, all mode Contest, from 0000 UTC December 8th to 2400 UTC
December 9th.
ABUSE IT AND LOSE IT
Part # 97.114 of the FCC Rules and Regulations
The transmission or delivery of the following amateur radiocommunications
is prohibited:
(a) International third party traffic except with countries which have
assented thereto:
(b) Third party traffic involving material compensation either tangible or
intangible, direct or indirect, to a third party, a station licensee, a control
operator, or any other person:
(c) Except for an emergency communication as defined in this part, third party
traffic consisting of business communications on behalf of any party. For
the purpose of this section, business communication shall mean any transmission
ot communication the purpose of which is facilitate the regular business or
commercial affairs of any party.
NEW THIRD-PARTY AGREEMENT
The United States has signed a third-party traffic agreement with St.
Christopher, Nevis and Anguilla. St. Christopher is known as St. Kitts. Call
sign prefixes are VP2E and VP2K. This agreement went into effect 08 August
1984.
MYSTERY SATELLITE
A "MYSTERY SATELLITE" has been heard on several occasions. Paul Wilson, W4HHK,
of Collierville, Tenn., says that he has heard satellite signals on 2301.0
Mhz. During the two-hour period, on October 5th, Wilson heard a steady carrier
with doppler shift on 2304.0 Mhz. At 0212 UTC, the dish heading was 52 degrees
azimuth, 20.5 degrees elevation. The signals and headings were confirmed
with WA4HGN, 80 miles away. W4HHK uses a 18 foot dish and WA4HGN a 28 footer.
Signals were 20 to 30 db out of the noise.
The signals were heard again at 1754 UTC the same day, in the same general
heading. If anyone is interested in these mysterious satellite signals,
contact Wilson at box 73, Collierville, Tn. 38071, Tel: (901) 853-7373.
160 METER NEWS
The FCC has proposed to reallocate half of the 160 meter band (1900-2000 Khz)
to non-government radio location because of the anticipated expansion of the
AM Broadcast Band. This would force certain radiolocation stations to move.
Although the September 11th release of Docket 84-874 came as a surprise to
the Amateur Radio community, ARRL took a swift reaction.
ARRL filed a motion to hold this NPRM in abeyance pending the resolution of
an ARRL petition filed September 10th.
Ironically, the day before this NPRM was released, the ARRL filed a Petition
for Initiation of Inquiry Procedure on the present use of the medium Frequency
bands by non-government radiolocation users.
The purpose of this inquiry is twofold:
First, to define the spectrum requirements of individual users, and second, to
find the number of radiolocation stations needed in a given geographical area.
The ARRL requests that the Commission take a look at the spectrum efficiency
and the technical need for the use of the 1900-2000 Khz band by non-government
radiolocation users. As we go to press, we have no indication of the course
that the FCC will follow in this case, which is beginning to look like the
bureaucratic equivalent of a soap opera. For further info on this matter,
watch the RTTY bulletins from the ARRL.
BETTER WORD
To refer to children as harmonics may be cute but it doesn't fit the facts
of life, electronic or human. Figure ir out. A harmonic is an integral
multiple of a signal fundamental frequency. A ham harmonic, it follows,
would have to be the offspring of a single parent. Parthenogenesis (look
it up in your dictionary) occurs in plants but not in people. A better term
would be heterodyne, which is a third signal that results from the mixing
of two different frequencies. If you think your kids are especially bright,
you can call them superheterodynes.irwin@uiucdcs.UUCP (11/27/84)
>"Let's see, ten times 20 meters would be ten times about 3.3 feet or 300 > feet." Given that a meter is about 3.3 feet, then 20 meters is 66 feet. Ten times that would be 660 feet. This would be 9 square acres, not one acre! W9LXP
gino@voder.UUCP (Gino Bloch) (11/30/84)
can the bug eat area? > >"Let's see, ten times 20 meters would be ten times about 3.3 feet or 300 > > feet." > > Given that a meter is about 3.3 feet, then 20 meters is 66 feet. Ten times > that would be 660 feet. This would be 9 square acres, not one acre! ^^^^^^^^^^^^ > W9LXP Square acres are the units of volume in four-space. -- Gene E. Bloch (...!nsc!voder!gino)