Wideband FM?

Forum for discussion about the Langstone Microwave Transceiver that shares some features with the Portsdown. Wiki: https://wiki.microwavers.org.uk/Langstone_Project
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g3yjr
Posts: 82
Joined: Sat May 23, 2020 1:37 pm

Wideband FM?

Post by g3yjr » Mon Jun 21, 2021 3:40 pm

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

radiogareth
Posts: 1215
Joined: Wed Jan 06, 2016 9:46 am

Re: Wideband FM?

Post by radiogareth » Mon Jun 21, 2021 3:44 pm

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

g4eml
Posts: 674
Joined: Thu Apr 26, 2018 9:36 am

Re: Wideband FM?

Post by g4eml » 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.

radiogareth
Posts: 1215
Joined: Wed Jan 06, 2016 9:46 am

Re: Wideband FM?

Post by radiogareth » 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

g3yjr
Posts: 82
Joined: Sat May 23, 2020 1:37 pm

Re: Wideband FM?

Post by g3yjr » Tue Jun 22, 2021 3:38 pm

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

g3yjr
Posts: 82
Joined: Sat May 23, 2020 1:37 pm

Re: Wideband FM?

Post by g3yjr » Tue Jun 22, 2021 3:58 pm

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

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