Langstone build thread - join in the fun!

Forum for discussion about the Langstone Microwave Transceiver that shares some features with the Portsdown. Wiki: https://wiki.microwavers.org.uk/Langstone_Project
radiogareth
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Joined: Wed Jan 06, 2016 9:46 am

Re: Langstone build thread - join in the fun!

Post by radiogareth » Wed Oct 14, 2020 1:50 pm

If you have built a Pluto INTO your Langstone/Portsdown box, have you screened it? Ie Tin box etc.....it would seem wise, given the proximity of the RPi?? The latest lead with mine came with a ferrite suppressor on it too, at the computer end.
Gareth

g4eml
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Re: Langstone build thread - join in the fun!

Post by g4eml » Wed Oct 14, 2020 4:47 pm

I removed the Pluto board from its plastic case and attached it to an aluminium chassis. Then fitted a brass cover over it.
However I didn't really notice much difference in Rx or Tx performance so I am not sure if it is really necessary. Probably doesn't do any harm though.

Colin G4EML

G8GKQ
Site Admin
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Re: Langstone build thread - join in the fun!

Post by G8GKQ » Wed Oct 14, 2020 5:13 pm

Hi Gareth

I wanted to mount my Pluto in close proximity to the RPi 4 and two 3W power amplifiers (one for 146, and the other for 437) so I removed the plastic case and built a square tinplate box around it. I soldered up the bottom and side seams and have some fingering around the lid.

No idea about any performance improvement, but it has worked flawlessly in that environment.

Dave

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

Re: Langstone build thread - join in the fun!

Post by radiogareth » Sun Oct 18, 2020 2:14 pm

OK, As its mounted in a plastic box I have provided copper foil/tape as a 'ground plane' and a U shaped aluminum hood that's open at the connector and USB ends, hopefully better than nothing. The Hood grounds the copper foil when I bolt down the Pluto.
I have noticed that the Pluto is sensitive to more than 5 volts (think I read that somewhere recently / Wiki?) and when switching to Langstone it will just lock up and sit there saying loading....everything seems happy around the 4.9-5.0 mark with DC fed directly into the +5/0V GPIO pins from a 3A buck convertor.
Clip-on ferrites on their way for the short Anker (quality I hope) USB lead.
Gareth

radiogareth
Posts: 559
Joined: Wed Jan 06, 2016 9:46 am

Re: Langstone build thread - join in the fun!

Post by radiogareth » Mon Oct 26, 2020 12:19 pm

With my pluto being mounted inside the whole box, I wanted to extend the Activity/Ready LEDs to the front panel so I can see what the Pluto is actually doing (or not if something locks up).
The diagram is here https://wiki.analog.com/_media/universi ... c_revb.pdf showing low side drivers as might be expected. The LEDs on the PCB were tried with some 5mm blue conventional ones across and as both still lit up fine I went with simple wire extensions to my front panel. They were easy enough to solder to with a conventional iron, unlike the RPi which was a real job!
Gareth
2020-10-26 11.00.11.jpg
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