Volume 1 Issue 2 KC6GAG editor April 1995
ATN / KC6GAG FAX LINE -- 714-961-0310 -- email to jpawluk@portal.com
ATN on the Web Wave
Better late than never. Well, the first issue of ATN rolled off the press in January. I thank the user base for all of the support and good information that provided the first news letter in some time. With a new computer and software, a better spell checker, and graphics support, future news letters will get better and more informative. Please do not forget I need your support and your stories.
ATN surf's the internet wave. The Official Source of Information for the Fast Scan Amateur Television in Central and So. California. With the expertise of John KB6MMF and his Amiga computer, and high resolution graphics files, the ATN Network news letter is being seen all around the world. To view this information key in:
http://www.portal/~jpawluk/KB6MMF.html
or http://www.ladas.com/ATN
Send mail directly to Rich
Repeater Information
Santiago Peak - WA6SVT
Mike WA6SVT and Dave KA6DPS went to Santiago Peak 3-19-95 to install the 10 GHz filter and reset the computer I.D.er. They also set the video and audio levels for the 2 GHz and 434 MHz machines. They will have to make another trip to remount the 10 GHz antenna. When they put the filter on, they had to move the antenna and now Mike KC6CCC can not get in on 10 GHz. So far Mike KC6CCC is the only one on 10 GHz with 100 milliwatts and a 3 ft. dish, but other people are working on it.
COVERAGE:
Los Angeles, Orange, San Bernardino, Riverside, and San Diego Counties
OUTPUT: 1253.25 MHz (VSB)
INPUT: 10.4 GHz (FM), 2441.5 MHz(FM), 434.0 MHz (AM)
Oat Mt. - NU6X
Mike WA6SVT went to Oat Mt. on 3-18-95 and installed a Circulator for the 2 GHz link Transmitter so the link is working again.
COVERAGE:
West Los Angeles county and East Ventura county
OUTPUT: 919.25 MHz (VSB)
INPUT: 434.0 MHz (AM)
Blueridge Mt. - WB6VVV
Mark WB7AJC rode his Motorcycle up to Blueridge and then walked 4.5 miles from the highway in snow up to his knees with 100 lbs. of tools. The 434 antenna had broken in half. He climbed the tower and hooked up a spare 434 receive antenna that was at the repeater site. The repeater now is working but we will need to buy a new antenna. I hope we can wait until the snow melts so we can drive up to the site. Thank you Mark from all of us.
COVERAGE:
Los Angeles and Hi Desert Area of Southern California
OUTPUT: 919.25 MHz (VSB)(Horizontal Polarization)
INPUT: 434.0 MHz (AM)(Vertical Polarization)
Mt. Potosi - KB7BY
COVERAGE:
Las Vegas Area
OUTPUT: 1253.25 MHz (VSB)
INPUT: 913.0 MHz (FM)(Horizontal Polarization), 434.0 MHz (AM)
Mt. Breckenridge - WA6SVT
COVERAGE:
Kern County (Bakersfield area)
OUTPUT: 1277.25 MHz (VSB)
INPUT: 434.0 MHz (AM)
Loop Canyon - WA6ZVE
COVERAGE:
Los Angeles county (San Fernando Valley)
OUTPUT: 1277.25 MHz (VSB)
INPUT: 434.0 MHz (AM)
Santa Barbara - WB9KMO
COVERAGE:
North Ventura county & Santa Barbara county
OUTPUT: 1277.25 MHz
INPUT: 434.0 MHz
Mt. Palomar - W6NWG (Affiliated)
COVERAGE:
San Diego county
OUTPUT: 1241.25 MHz (VSB)
INPUT: 919.25 MHz (AM), 915.0 MHz (FM)
Coming Events
ATV Demonstrations Generate Excitement
"IT'S GREAT TO SEE THE EXCITEMENT OF HAMS EXPERIENCE A NEW MODE OF OPERATION, ESPECIALLY ATV" says Roland Hoffman, KC6JPG as Amateur Television demonstrations are making a big impact to the many hams who have been curious about this fascinating mode of operation, but didn't want to invest to see if this mode is right for them.
With the help of the many ATV'ers, especially the members of the Amateur Television Network, ATV demo's made a strong impression to interested hams (and would be hams) at many different Amateur Radio Clubs in the Inland Empire.
Since July of 1994, Roland has been introducing ATV (and ATN) at the Riverside Amateur Radio Club, in the City of Riverside; Tri-County Amateur Radio Club, in Pomona; Corona-Norco Amateur Radio Club, in the City of Corona; Golden Triangle Amateur Radio Club, in the city on Murietta Hot Springs; and the OMIK Amateur Radio Club during their national convention in Las Vegas Nevada. All transmissions were sent to the WA6SVT Santiago Peak repeater with the exception of OMIK demo as the KB7BY Mt. Potasi repeater was utilized.
In the future, Roland is planning a trip to the Bakersfield area to spark some interest in support of the Mt. Breckenridge System.
Special thanks goes to Moody Law-WQ6I for his help & support for the Tri-County Amateur Radio Club meeting and Ed Cooper-AC6BO for his support at the Corona-Norco Club and at the Golden Triangle Club. A big THANK YOU goes to all ATV'ers for your "ON THE AIR" help and support in which made these demonstrations informative, educational, and FUN!
If you are interested to have a demo set-up for your radio club or group, contact Roland Hoffman-KC6JPG at 909-356-2021, and he will put your group ON TV (ATV that is)!
Technical Notes
Experimental Direct Conversion Receiver 2.4 GHz FMTV
This system utilizes injection-lock technique for both video and audio recovery.
A model has been built and works well, having received my 2.4 GHz signal at 400 yards, P5. Don't know the full range yet.
It meets my idea for Keep It Simple Stupid!
I plan a similar setup for 10 GHz using compatible 10 GHz MMIC and a gasfet.
I expect to receive Bob, N6AZV on 2.4 GHz direct sometime soon with the 2.4 GHz version.
73, Ray N5RE
P.S. makes a nice monitor!
Santiago Peak 2.4 GHz FM Input Data
The following information is to help in calculation of RF power and antenna gain needed to properly access the new input. Line of sight is assumed in the figures. Threshold (the point were most of the sparklies are gone) is -90 dBm into the front end (filter + preamp at the antenna). Antenna gain is 10 dBd in most directions, south Orange County area has a few dB reduction due to the tower blockage. So let us assume that we want some fade margin, about 10 db minimum this will give a -90 dBm minimum target signal level that we need to get from your QTH to the hilltop. Use a map to find Santiago Peak and get the distance to the repeater and use the chart to find path loss in dB. now add your TX power in dB (chart provided), subtract line loss and add antenna gain this should help to better provide you with equipment and antenna requirements you will need. Example: TX power +30 dBm (1 watt) line loss 1 dB antenna gain +24 dB path loss -127 dB 30 miles this gives a -74 dBm level at the hilltop.
Antenna Gain: 2 foot 18 dBd
4 foot 24 dBd
6 foot 27 dBd
8 foot 30 dBd
Line Loss, 100 Feet: 1/2 inch heliax 3.5 dB
7/8 inch hardline 2 dB
1/2 inch superflex 5 dB
9913 coax 7.5 dB
Power dBm vs Wattage: 100 mW......+20 dBm
200 mW......+23 dBm
1 W.........+30 dBm
5 W.........+37 dBm
Path loss vs distance: 10 miles -124 dB
20 miles -130 dB
30 miles -133 dB
40 miles -136 dB