wtorek, 26 lutego 2019

QO-100 and cheap PLL LNB SHARP bs1k2el200a

It works:
QO100 @ SHARP bs1k2el200a + 40cm offset dish + rtl-sdr

I was trying to make signal more stable, so I used AD9854 DDS + 10MHz OCXO. I replaced quartz with small transformer to make symmetrical signal. And this works ok.
Then i tried to feed it with 25788589.743 Hz to make QO's transponder available on 432MHz band. This works too, but SNR suffers about 10 dB loss :(

SHARP bs1k2el200a inside

DDS signal @25.5MHz