My Digilite test and aligment with Tutioune

[F6DZP]

Hello again,

Yesterday I have finished to buid my second Digilite for 1255Mhz, SR4000.
I started as soon I plugged the DC power.
alignment again made with Tutioune, observing MER and constellations.
I can obtain 36dB Mer. The best we can.

digilte 1255 -4MS HP8657B -6dBm Tutioune.jpg (232.42 KiB) Viewed 3707 times

and spectrum:

digilte 1255 -4MS HP8657B -12dBm spectre sans attenuateur.jpg (75.93 KiB) Viewed 3707 times

RF measured with SEFRAM give only -19dBm ( about 0.013 mW) I think too small ? What value must we expect at MAR6 output?


Digilite is a really good solution for DVB-S!

When software will be able to catch TS via UDP, I could stop to use my DTA107.

Jean Pierre F6DZP

[G4EWJ]

-19dBm seems very low. Mine is about -7dBm. I'm using an MSA-0886 instead of a MAR-6, but the gain should be similar.

Maybe you have to trade MER against output level. What is your pk-pk voltage at the inputs to the AD8346?

Brian