ABOVE, UTUBE LINK TO THE VIDEO OF
MY FIRST DVB TV DIRECT FROM THE ISS
THERE IS NO SOUND ON THIS VIDEO
CLIP, A MIC SWITCH ON THE ISS CAMERA WAS NOT ON.
This picture was taken during
some testing, so various bits hanging off.
The dish antenna system is
portable. Two people and a small van is all that is needed. The
dish can be lifted
off the main center pole. The top pole can be unbolted in the
middle from the lower pyramid section. A total of 3 pieces.
To give an idea of overall size, the dish is 1.2 meters
diameter, the spirit level sitting on the concrete blocks is
The system survived at least 5 named winter storms, 2015/2016,
with wind gusts in Ireland over 100kph.
This is a typical data set from my antenna system on 7th June
The shoulder in the yellow MER data is a telegraph pole, 5mtrs
away, with wires radiating, hence the dip.
The jagged appearance of the signals is the start stop motion of
the AZ and EL motors.
The station was operational from March 2015 receiving the
The LNB was connected to the Downconverter by an N-type
barrel connector to eliminate coax losses. A plastic
bag was taped to cover the downconverter as it was designed
to be mounted with connections facing downward, I think it
is only splash-proof. A small hole is cut in bottom of bag
just in case!
The rusty piece of iron hanging from strut is a weight to
keep a little bit of downward pressure as dish is perfectly
balanced on pillow bearings, and there is slight play in the
mounts of the actuator. The bolts supplied are 6mm diameter
and the actuator holes are 6.52mm. The next time I visit the
machine shop I will have better fitting bolts made.
The manufacturers of the actuator never imagined the
accuracy expected for a project like this.
The actuator came with a multiturn pot feedback sense of 50k
ohm, I changed this to 500 ohm to suit the Yaesu controller.
The elevation system is calibrated for 90 degrees only. The
ISS is always south of Ireland.
This rear photo gives a better idea of the elevation
Data from 22 February 2016.
Max elevation on this pass 55 degrees.
AOSignal range 950klm.
LOSignal range 1150klm.