18v h power

Discussion about the MiniTiouner board and the MiniTiouner Digital ATV Receive Software. See also http://www.vivadatv.org/index.php
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M5TXJ
Posts: 185
Joined: Wed Jul 05, 2017 8:34 pm

Re: 18v h power

Post by M5TXJ » Sun Apr 28, 2019 5:50 pm

Hi all,
I just added an EBay buck converter and a centre off dpdt switch into my Minitiouner, the switch simply puts 12v or 18v to the pcb pin that feeds lnb power to the NIM.
73 Dave.
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2W0ODS
Posts: 51
Joined: Sun Oct 21, 2018 5:15 pm

Re: 18v h power

Post by 2W0ODS » Sun Apr 28, 2019 7:04 pm

M5TXJ wrote:
Sun Apr 28, 2019 5:50 pm
Hi all,
I just added an EBay buck converter and a centre off dpdt switch into my Minitiouner, the switch simply puts 12v or 18v to the pcb pin that feeds lnb power to the NIM.
73 Dave.
I've never had any luck with those Buck converters, they seem to cause a lot of QRM, especially on the 2m band.

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M5TXJ
Posts: 185
Joined: Wed Jul 05, 2017 8:34 pm

Re: 18v h power

Post by M5TXJ » Sun Apr 28, 2019 7:17 pm

Don't need the buck converter on 2m, only for 18v, that's why it's on a centre off switch. Because the 12v feed is direct from the incoming supply it can also feed a preamp on 2m and 70cm, win win. I always add extra filtering to the converter too.

Don't forget the RT5047 is also a buck converter.

G4NRT
Posts: 54
Joined: Thu May 09, 2019 2:59 pm

Re: 18v h power

Post by G4NRT » Wed Jul 03, 2019 7:13 am

Nick wrote:
Sun Apr 28, 2019 11:02 am
I just use a E-Bay buck converter to get the 18V. The 18V output is fed to a 12V regulator with didoes in the common connection to get the voltage to 13V. The Bias-T itself was obtained from E-Bay.

Nick - G4NKV
Bias-T 1.jpgBias-T 2.jpgBias-T 3.jpg
I really need one of these! The problem is that I no longer have the eyes or the manual security to build one myself. Can anyone direct me to a 'ready made' solution?

TiA and 73, David G4NRT

M0IVJ
Posts: 8
Joined: Tue Jun 04, 2019 1:18 pm

Re: 18v h power

Post by M0IVJ » Thu Jul 04, 2019 7:56 am

Hi David, Richtek make an evaluation board (Digi-Key Part Number EVB_RT5047GSP-ND) that can be used with the Minitioune and controlled with the latest software. It’s expensive for what it is, but saves the eye strain.

73's John M0IVJ

G4NRT
Posts: 54
Joined: Thu May 09, 2019 2:59 pm

Re: 18v h power

Post by G4NRT » Thu Jul 04, 2019 8:31 am

Thanks John. I shall check it out.

David G4NRT

G4KLB
Posts: 207
Joined: Wed May 28, 2008 10:46 am

Re: 18v h power

Post by G4KLB » Sat Jul 06, 2019 11:02 am

Working on a version that fits the standard V2 box ........ watch this space.
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This one is configured for testing the various options, more info to follow.

If all goes well should find the PCB in the BATC shop, some minor rework to make construction easier after testing is complete.

G4KLB
Posts: 207
Joined: Wed May 28, 2008 10:46 am

Re: 18v h power

Post by G4KLB » Mon Jul 29, 2019 2:43 pm

Almost ready with our version to fit the standard V2.0 case

(Someone forgot to specify blue boards on this prototype) :oops:
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btm.jpg
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