READY for Es'HailSat 2

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)

MAIL ME if you are interested (also for modified LNBs)

info

SOME MORE about my stuff
and some tests via QO-100 can be seen on my YOUTUBE CHANNEL 
LINK TO YT

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
---------------------------------------------------------------------------------------------------------------------------------
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. october 2019 (DG0OPK)