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COMMUNICATING OVER LOE FM SATELLITES. LARRY BROWN WB5CXC. WB5CXC making a satellite contact. Equipment. 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

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Presentation Transcript
equipment
Equipment
  • 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
slide9

Azimuth

Elevation

On 4/01/08 at 20:35 at 10 deg. elevation and 177 deg. azimuth

you will get AOS (Acquisition of Signal).

On 4/01/08 at 20:40 at 63 deg. elevation and 258 deg. azimuth

you have Mid-Path (highest elevation).

On 4/01/08 at 20:45 at 10 deg. elevation and 340 deg. azimuth

you will get LOS (Loss of Signal).

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 start

making contacts.

antenna
Antenna
  • Dual 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 plans
Antenna 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)
slide20

Arrow Antenna

10W Duplexer

ao 51 frequencies
AO-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
slide22

AOS

Mid-Pass

LOS

operating
Operating
  • Set 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
slide24

Yaesu VX-5

Using both VFOs

1 for Tx the other for Rec’v

slide25

Azimuth

Elevation

On 4/01/08 at 20:35 at 10 deg. elevation and 177 deg. azimuth

you will get AOS (Acquisition of Signal).

On 4/01/08 at 20:40 at 63 deg. elevation and 258 deg.

Azimuth you have Mid-Path (highest elevation).

On 4/01/08 at 20:45 at 10 deg. elevation and 340 deg.

Azimuth you will get LOS (Loss of Signal).

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 start

making contacts.

slide26

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.

slide27

Worked Grid Square program:

http://VE2ZAZ.net/WorkedGrids/WorkedGrids.htm

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