d-star
Posted: Sun Feb 11, 2024 12:20 pm
Hi:
I bought in my icom-7100 to analyze the transmissions via DV, and the net on 14.280 was coming up. I thought I'd use the Flex 5000A to do the receive into DSDPlus. After looking at the spectrum, I started playing with the RX modes. I could see the audio being received on DSD's scope, but no decodes. I eventually used SDRPlay and SDRUno in FM narrow, and no de-emphasis which worked. I left the RX filter very narrow, containing only the D-Star bandwidth.
I noticed the RX waveform looked like a clipped triangle wave.
I went back to the Flex and started again playing with the FM RX modes. The RX scope shows a rounded waveform. I seen a 'data' button! This didn't seem to help. I seen the DSP settings for FM-D. It looks like the buffer can be changed for just the digital switch. That didn't seem to help the waveform. I right-clicked the FM Mode which let me choose WFM, I guess way wider than 5KC. The decodes worked, but so many adjacent stations came in with it.
I was wondering if some sort of fine tune on FM bandwidth and maybe even de-emphasis can be implemented, like the sliders on sideband.
Thanks!
Harry KB2MEN
I bought in my icom-7100 to analyze the transmissions via DV, and the net on 14.280 was coming up. I thought I'd use the Flex 5000A to do the receive into DSDPlus. After looking at the spectrum, I started playing with the RX modes. I could see the audio being received on DSD's scope, but no decodes. I eventually used SDRPlay and SDRUno in FM narrow, and no de-emphasis which worked. I left the RX filter very narrow, containing only the D-Star bandwidth.
I noticed the RX waveform looked like a clipped triangle wave.
I went back to the Flex and started again playing with the FM RX modes. The RX scope shows a rounded waveform. I seen a 'data' button! This didn't seem to help. I seen the DSP settings for FM-D. It looks like the buffer can be changed for just the digital switch. That didn't seem to help the waveform. I right-clicked the FM Mode which let me choose WFM, I guess way wider than 5KC. The decodes worked, but so many adjacent stations came in with it.
I was wondering if some sort of fine tune on FM bandwidth and maybe even de-emphasis can be implemented, like the sliders on sideband.
Thanks!
Harry KB2MEN