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Re: ADALM-PLUTO (new DATV SDR)

Posted: Tue Oct 22, 2019 11:19 am
by radiogareth
Thanks Paul, That will keep me going for a while. Not yet on NB, on my to-do once I swap out the TXCO on my pluto. Its SO small...

Gareth

Re: ADALM-PLUTO (new DATV SDR)

Posted: Tue Oct 22, 2019 3:55 pm
by g0mjw
radiogareth wrote:
Tue Oct 22, 2019 11:19 am
Thanks Paul, That will keep me going for a while. Not yet on NB, on my to-do once I swap out the TXCO on my pluto. Its SO small...

Gareth
Its a lot bigger than it's replacement.... you don't have to do this, the drift is not that bad if you use Simon's SDR Console to correct on RX and keep an ear of the TX.

Mike

Re: ADALM-PLUTO (new DATV SDR)

Posted: Tue Oct 22, 2019 9:22 pm
by G4WIM
I fitted a vctcxo as detailed in the link below - huge improvement but the vctcxo is very small a little fiddly to install.

https://www.qrz.com/db/DG9BFC

Re: ADALM-PLUTO (new DATV SDR)

Posted: Wed Oct 23, 2019 7:46 am
by radiogareth
Thanks for the link, his closeup picture helps with orientation. I have (well, 'had') two of the oscillators, one escaped during inspection :-(
I have magnification and a hot air rework, but as stated, its so small. Technique seems to be use flux and surface tension to locate it, then heat.
'Work in progress'.......
Gareth

Re: ADALM-PLUTO (new DATV SDR)

Posted: Wed Oct 23, 2019 8:48 am
by g0mjw
You might want to try Chipquick to remove the original.

Mike

Re: ADALM-PLUTO (new DATV SDR)

Posted: Wed Oct 23, 2019 10:30 am
by radiogareth
Got some, noted.....From what I've read its not worth moving it from its original pads. Adding thermal bulk and an alloy case will also help with short term variations as per the DL mods.
Gareth

Re: ADALM-PLUTO (new DATV SDR)

Posted: Wed Oct 23, 2019 2:16 pm
by m0eyt
Hi all,

I removed the original TCXO in my pluto my firstly kaptoning up the stuff around the LO, then using a hot-air rework gun set at about 300C to heat the area, followed by tinning the top of the TCXO with a soldering iron, this melts all the solder and you can just push it to one side, then wick the pads clean etc. I mounted by new LO away from the original spot as there were reports of localised board heating there. I used 0.35mm ECW for the connections as per the pic below;
20190922_184613.jpg
20190922_184613.jpg (676.79 KiB) Viewed 1029 times
BTW on the DATV topic, a new firmware has been released to beta- testers which now supports GPIO PTT keying output when an input RTMP stream is present.
20191023_124122.jpg
20191023_124122.jpg (141.24 KiB) Viewed 1029 times
I've added an opto + 4r7, the opto output controls the PTT stuff on the PA's and works perfectly.

regards,

Paul M0EYT.