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Wideband FM?
Posted: Mon Jun 21, 2021 3:40 pm
by g3yjr
I know Langstone is intended for narrowband modes. Might it easily be extended for domestic wideband FM stations? They are handy for sound tests.
73 Graham
Re: Wideband FM?
Posted: Mon Jun 21, 2021 3:44 pm
by radiogareth
Think I asked that a while back and got a 'no plans' answer. Fairly sure the Portsdown supports the RTL dongle for that sort of usage.....
Gareth
Re: Wideband FM?
Posted: Mon Jun 21, 2021 4:37 pm
by g4eml
Langstone uses 48KHz sampling for generating and receiving all modes. That is not high enough to handle wideband FM. Increasing the sampling rate would put extra processing load on the Pi which is already working quite hard.
Colin.
Re: Wideband FM?
Posted: Mon Jun 21, 2021 4:44 pm
by radiogareth
Portsdown 4 has it on Menu 2, RTL-FM RX, just tested it on local FM station. OK so you need a £10 RTL dongle....
|Gareth
Re: Wideband FM?
Posted: Tue Jun 22, 2021 3:38 pm
by g3yjr
g4eml wrote: ↑Mon Jun 21, 2021 4:37 pm
Langstone uses 48KHz sampling for generating and receiving all modes. That is not high enough to handle wideband FM. Increasing the sampling rate would put extra processing load on the Pi which is already working quite hard.
Colin.
OK Colin, all noted. 73 Graham
Re: Wideband FM?
Posted: Tue Jun 22, 2021 3:58 pm
by g3yjr
radiogareth wrote: ↑Mon Jun 21, 2021 4:44 pm
Portsdown 4 has it on Menu 2, RTL-FM RX, just tested it on local FM station. OK so you need a £10 RTL dongle....
|Gareth
I hadn't paid attention to the PD4's RTL-FM button, so thaks for the reminder Gareth. I have an RTL dongle somewhere.
73 Graham