little output power (no modulation?)

dh2va · Post by **dh2va** » Thu Jun 11, 2020 8:26 am

Hi everybody,
I am currently upgrading my Portsdown to the 2020 version with the LimeMini I had here collecting dust. So when taking a brandnew Buster installation, a powered USB hub and upgrading the Lime to FW 1.30 and then the DVB FW, I end up with a very low (-45dBm) unmodulated output sitting on a noise pedestal.. Any ideas what I am missing?

73s Achim

dh2va · Post by **dh2va** » Thu Jun 11, 2020 8:27 am

And the spectrum as last image.. the signal in the middle is indeed unmodulated.

Post by **G8GKQ** » Thu Jun 11, 2020 8:29 am

Hi Achim

Try setting the Audio to "Auto" rather than "Bleeps". Not sure "bleeps" work with H264.

Dave

Post by **G8GKQ** » Thu Jun 11, 2020 8:54 am

Or try Modulation, Carrier as a starting point.

Dave

dh2va · Post by **dh2va** » Thu Jun 11, 2020 8:56 am

Dave,
sadly no change. Neither with Audio nor Carrier (output power even decreased but shape did not change). Probably something obvious.

g4eml · Post by **g4eml** » Thu Jun 11, 2020 9:12 am

Just one observation, you said you updated the Lime to the DVB firmware, I thought there was a special setting for that in the ‘Output to’ button.

dh2va · Post by **dh2va** » Thu Jun 11, 2020 9:19 am

Colin, you saved me a great deal of more grey hairs! That was it, thank you very much for spotting this noob error. RTFM..

g4eml · Post by **g4eml** » Thu Jun 11, 2020 12:03 pm

Glad to help...
73

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little output power (no modulation?)

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