DATV-Express RB-TV spectral regrowth

[OE3GBB]

Hello,
I have successfully set up the RPi with touchscreen and camera to operate RB-TV on 437 MHz. When I am useing SR below 500k I see a shoulder only right hand (upper frequencies) at about -32 dB, regardless of the output level. At SR 125 it even Looks like a second "carrier" seperated by about 100 kHz from the main carrier, also at -32 dB. Is this known and what could be the reason? How can I avoid that? I do have a 1 MHz filter, but that is not steep enough.
regards
Gerhard OE3GBB

[g0mjw]

Sounds like you are not using the narrowband switch in older software. Its been a long time since I used the PI and express.

Mike

[OE3GBB]

Hi Mike,

Problem is solved. It was a mismatch of the DATV-Express card to the amplifier. So, after I inserted a 3 dB attenuator, all was as it should be.
Regards
Gerhard OE3GBB