READY for
Es'HailSat 2
UPDATE
6.April2020:
monitoring some time more ....
the BEACON gives a PEAK MER of 12.0dB in the cold
morning hours
the screenshot shows the level from 6.april 2020 on the
TBS6903
UPDATE 29.March2020:
On
25.MARCH 2020 there made changes in the DATV-BEACON
Parameters
AMSAT-DL
gives the following information...
DATV Beacon DVB-S2 parameters (since 25.march2020)
DVB-S2
QPSK 4/5 FEC
1500 kSymbols
RollOff = 0,25
Pilots = off
min. C/N = 4.6dB
Datarate 2.383 MBit
Center Frequency: 10.4915 MHz
So
i checked the signal level on my 120cm LAMINAS OFFSET DISH
with my TCXO-TWIN-LNB
(look infos below)
120cm LAMINAS OFFSET MER: 11.6dB
MAIL ME if you are
interested (also for modified LNBs)
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UPDATE APRIL/SEPTEMBER 2019:
QO-100 Es'Hail2 is QRV ......
the setup is working nice ..
The
information about modifying the OCTAGON OTSLO
LNBs with the D75F was removed
because it was used by resellers without
of asking before
AND
MEASUREMENTS in beginning of 2019 shows that
the (NEW) D75F TCXOs (delivered after mid/end
of 2017)
have strong frequency jumps and they are
overcompensated over temperature.
So the MODIFICATION with the D75F
TCXO can not used anymore!
COMPARISION OLD
D75F upper part (before 2017) and
NEW D75F AFTER MID 2017(lower part)
On the market there are also modified
LNBs with some "wobbling"
which dont work good!
update SEPTEMBER
2019:
i found a good
working alternative solution with an very low
noise and stable TCXO.
it is working nice with very good reception
results for selected LNBs
information is given here
info
amsat forum
on the narrowband transponder i got an
noise level of about
6dB on an 85cm DISH with the SDR CONSOLE
on the wideband transponder i got the
following S/N levels
on the DATV BEACON at 10492.5MHz (SR2000
with empty transponder)
MER level
comparision table QO-100 DATV
BEACON by DG0OPK 09/2019
(measured with TT-S2 1600,
MinitiounerExpress and TBS-6903)
60cm NO NAME DISH MER:
5.2-5.5dB
60cm CAS-060 Kathrein MER:6.2dB
(PEAK 6.5dB)
85cm FUBA DISH with LNB Offset 7deg (Center to 19.2east) MER: 7.3dB
85cm TRIAX (TDA88) OFFSET MER:
8.2dB
120cm LAMINAS OFFSET MER: 9.6dB
(PEAK 10.2dB)
NOTE:
I have spent a lot of time and money to verify
which devices work and which not .
This modification
was only made for the personal use
of
radioamateurs and not for commercial
purposes and is without any
warranty.
73 de DG0OPK
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start original text april 2017
my goal for this work:
It is planned
to launch the first geostationary amateur radio satellite
after some delay in the beginning of 2018.
Es'Hailsat2 has 2 S-band(uplink) and X-band (downlink)
transponders on board. The downlink frequencies of the
X-band
transponder are near the commercial TV downlink frequencies.
So it is possible to use cheap LNBs from TV for the
reception.
In 2013 there were made some observations from radioamateurs
that the PLL-LNBs use a simple crystal for the LO and can be
modified for amateur radio use. One of these types is (was -
look below) the OCTAGON OTLSO TWIN
LNB.
So some modifications with other crystals and also with
external reference input were made. But this was not what I
want.
I needed an highly stable LNB for narrowband use
- SSB/CW/digimode and which
can be used for normal TV reception without change.
So i decided to try modifiy the LNB with an internal TCXO.
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last
change: 06. april 2020
(DG0OPK)
