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little output power (no modulation?)
Posted: Thu Jun 11, 2020 8:26 am
by dh2va
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
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 8:27 am
by dh2va
And the spectrum as last image.. the signal in the middle is indeed unmodulated.
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 8:29 am
by G8GKQ
Hi Achim
Try setting the Audio to "Auto" rather than "Bleeps". Not sure "bleeps" work with H264.
Dave
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 8:54 am
by G8GKQ
Or try Modulation, Carrier as a starting point.
Dave
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 8:56 am
by dh2va
Dave,
sadly no change. Neither with Audio nor Carrier (output power even decreased but shape did not change). Probably something obvious.
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 9:12 am
by g4eml
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.
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 9:19 am
by dh2va
Colin, you saved me a great deal of more grey hairs! That was it, thank you very much for spotting this noob error. RTFM..
Re: little output power (no modulation?)
Posted: Thu Jun 11, 2020 12:03 pm
by g4eml
Glad to help...
73