COMMUNICATING OVER LOE FM SATELLITES
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Transcript of COMMUNICATING OVER LOE FM SATELLITES
COMMUNICATING OVER LOE FM SATELLITES
COMMUNICATING OVER LOE FM SATELLITES
LARRY BROWNWB5CXC
LARRY BROWNWB5CXC
WB5CXC making a satellitecontact
EquipmentEquipment
Dual Band Handheld - 2M & 70 CM
Dual Band Antenna - 2M & 70 CM (3 elements on 2M - 6 elements on 70 CM)
Duplexer for the antenna
Satellite Tracking Program
Portable Recorder (optional)
FINDING THE SATELLITES
FINDING THE SATELLITES
THERE ARE SEVERAL PROGRAMS AVAILABLE
ORBITRON IS A CARDWARE PROGRAM
Orbitron Main Screen
Setting up for a Prediction
Results of a Prediction
What kind of coverage etc. do we have at4/01 @ 9:30
On 4/01/08 at 20:35 at 10 deg. elevation and 177 deg. azimuthyou will get AOS (Acquisition of Signal).
On 4/01/08 at 20:45 at 10 deg. elevation and 340 deg. azimuthyou will get LOS (Loss of Signal).
On 4/01/08 at 20:40 at 63 deg. elevation and 258 deg. azimuthyou have Mid-Path (highest elevation).
Most of the time you need to try for a Mid-Pass elevation above 30 deg. ~ 10 deg. elevation is the practical elevation to start hearing the satellite and ~ 15 deg. is where you can startmaking contacts.
ElevationAzimuth
Simulation of a pass in the Future
MacDoppler - MAC program - 3D View
MacDoppler - MAC program - 2D View
AntennaAntennaDual Band Antenna - 2M & 70 CM (3 elements on 2M - 6 elements on 70 CM)
Homebuilt using a 1” X 2” pine boom ~ 3’
Elements are made from #8 solid copper wire
Arrow Antenna Duplexer
Antenna PlansAntenna Plans
Cheap Antenna designed by WA5VJB
Web site www.fredspinner.com/W0FMS/cheapyagi/vjbcy.html
2M Elements are rotated 90 degrees from 70 CM Elements
Arrow Antenna 10W duplexer (board + parts ~ $ 29)
Elements are #8 bare copper wire (~ 1/8”)
440 Mhz Driven Element
3 Element 2 M Yagi
2M Driven Element
WA5VJB Cheap Antenna Design2M & 70CM
Arrow Antenna10W Duplexer
AO-51 FrequenciesAO-51 Frequencies
Transmit 145.920
Receive 435.300 + 10 Khz doppler effect
Doppler Effect - satellite coming towards you - the frequency is higher - when the satellite is going away the frequency is lower
Transmit Tone Receive
145.920 67.0 435.310
145.920 67.0 435.305
145.920 67.0 435.300
145.920 67.0 435.295
145.920 67.0 435.290
AOS
Mid-Pass
LOS
OperatingOperatingSet your handheld for receive on 435.310 and transmit 145.920 tone 67.0 hz
Open your squelch (satellite won’t be full quieting)
Observe the time and point your antenna toward the bearing and elevation as indicated by the software
When the noise starts to fade you are starting to pick up the satellite
Yaesu VX-5Using both VFOs1 for Tx the other for
Rec’v
On 4/01/08 at 20:35 at 10 deg. elevation and 177 deg. azimuthyou will get AOS (Acquisition of Signal).
On 4/01/08 at 20:45 at 10 deg. elevation and 340 deg. Azimuth you will get LOS (Loss of Signal).
On 4/01/08 at 20:40 at 63 deg. elevation and 258 deg. Azimuth you have Mid-Path (highest elevation).
Most of the time you need to try for a Mid-Pass elevation above 30 deg. ~ 10 deg. elevation is the practical elevation to start hearing the satellite and ~ 15 deg. is where you can startmaking contacts.
ElevationAzimuth
The satellite will start to fade, rotate your antenna to get a stronger signal (changing the antenna phase).
As the signal gets muffled or the satellite gets higher you will have to decrease the frequency due to the doppler effect.
Typical exchanges are short -
“This is Whiskey Bravo 5 Charlie Xray Charlie Echo Mike 2 0” “Copy EM 2 0 - N5FGM EM 45”
The exchange is your call sign and your Grid Square - mine is EM20. Give your call using ITU phonetics.
Worked Grid Square program:
http://VE2ZAZ.net/WorkedGrids/WorkedGrids.htm
IOio Satellite Antenna
432 IO Satellite Antenna
Egg Beater II - 432Mhz