RT5047 U3 and U4

The place for discussion about the 4-channel WinterHill DATV Receiver
G0LJF
Posts: 106
Joined: Wed Dec 25, 2019 5:28 pm

RT5047 U3 and U4

Post by G0LJF » Thu Mar 25, 2021 10:39 am

Hi,

U3 and U4 are 8 pin RT5047 modules on the schematic.

These do not exist in the BOM, nor in any text I have read. BATC shop sells a similar item but for the MiniTiouner 2 only.

Again, I maybe incorrect, but please can we have a mention about their use and availability in the BOM and/or the text.

And where may I buy them, please? I think that these are optional, as the power maybe supplied to the LNBs via a jumper matrix. Or not at all if you use a Bias-T.

I primarily used the BOM to source all the parts (in one hit) by automatic upload to Farnell.

From personal experience some kind of current limited LNB supply is essential as it did not take me long to short out mine!
So I added two Poly fuses to my MiniTiouner.

Do we add the BATC "RT5047 current limit PCB for MiniTiouner version 2" ? Looks like that is exactly the right thing electrically, not space wise.

Any guidance would be appreciated,

73, Mike

G4EWJ
Posts: 1413
Joined: Wed Feb 17, 2010 10:11 am

Re: RT5047 U3 and U4

Post by G4EWJ » Thu Mar 25, 2021 12:53 pm

The U3 and U4 LNB PSU modules need to be constructed as part of the project. I believe that the PCBs are en route, together with another batch of the main PCB. Here's a photo from a development board that shows them. They fit into the sockets to the left of the PICs. There'll be a separate schematic and BOM for them.

The RT5047 board for the MiniTiouner isn't suitable for WinterHill.

Farnell have the RT5047A chips. There are several versions of RT5047.
.
whv2.png
whv2.png (1.83 MiB) Viewed 11105 times

G0LJF
Posts: 106
Joined: Wed Dec 25, 2019 5:28 pm

Re: RT5047 U3 and U4

Post by G0LJF » Thu Mar 25, 2021 1:20 pm

OK Brian,

I see - so that is another distinct project in itself, which is running concurrently.

I can get the parts, of course.

I will keep on the look out for more details.

73, Mike

g0mjw
Posts: 2394
Joined: Sat Sep 20, 2014 9:15 am

Re: RT5047 U3 and U4

Post by g0mjw » Thu Mar 25, 2021 4:04 pm

Hi Mike

It is a distinct project. I took the BOM parts off the main Winterhill BOM in the Wiki, they are still there but there in the spreadsheet but there no PCBs available yet, they are on their way from China. Meanwhile I have attached the BOM. Treat with great caution and if you find the correct Farnell parts add to the list for others.

Mike
Attachments
RT_Module.xlsx
(1.15 MiB) Downloaded 754 times

G0LJF
Posts: 106
Joined: Wed Dec 25, 2019 5:28 pm

Re: RT5047 U3 and U4

Post by G0LJF » Thu Mar 25, 2021 5:35 pm

Thanks again - another hour on the internet coming up. Maybe tomorrow.

I did find it useful to use both RS and Farnell as some items were available at one and not another, and there was DigiKey too.

I am not making any kind of negative comments, far from it, just that for a project beginner its easy to miss the few vital mystery bits that go under the BOM 'radar' and the text on Wiki.

Mike

MN-tech
Posts: 59
Joined: Thu Aug 30, 2012 6:01 pm

Re: RT5047 U3 and U4

Post by MN-tech » Thu Mar 25, 2021 5:37 pm

There are 3 variations of the RT5047. Pin 7 of the IC can be N/C, Fault or comp. The Richtek documentation contradicts itself but I think the B version has the fault output. Colin G4KLB would know which worked for him. The comp input raises the output LNB by 1 volt. It should not be left floating.

G0LJF
Posts: 106
Joined: Wed Dec 25, 2019 5:28 pm

Re: RT5047 U3 and U4

Post by G0LJF » Thu Mar 25, 2021 5:46 pm

Hi,

Yes, all the more information, the better, for me. I shall look into the different variants.

And maybe anyone else just starting with this?

Ta, Mike

g8gtz
Posts: 1748
Joined: Wed Apr 07, 2010 6:26 pm

Winterhill LNB supply PCB

Post by g8gtz » Thu Mar 25, 2021 5:55 pm

Apologies - I forgot that Mike G0MJW had sent me some PCBs to put in the shop.

These are now available here: https://batc.org.uk/shop/lnb-supply-pcb ... -receiver/

in order to get them in the shop quickly, I linked to this forum thread for build information but we do need to include it on a wiki page - either a new one or the Advanced rxr PCB page.

73

Noel - G8GTZ

g0mjw
Posts: 2394
Joined: Sat Sep 20, 2014 9:15 am

Re: RT5047 U3 and U4

Post by g0mjw » Thu Mar 25, 2021 6:29 pm

G0LJF wrote:
Thu Mar 25, 2021 5:35 pm
Thanks again - another hour on the internet coming up. Maybe tomorrow.

I did find it useful to use both RS and Farnell as some items were available at one and not another, and there was DigiKey too.

I am not making any kind of negative comments, far from it, just that for a project beginner its easy to miss the few vital mystery bits that go under the BOM 'radar' and the text on Wiki.

Mike
I got mine from Farnell and Digikey on different occasions. The order codes are in the BOM file. RS don't appear stock them. I guess it's obvious but if you want to fit two modules, you are going to have to order twice as many of each part.

Also bear in mind the RT module is an order of magnitude more difficult to build as it uses an SMD IC that needs to have the tab underneath soldered and there are quite a few small parts close together. It's not very hard but not the best choice for your first attempt at surface mount. I would say about the time you start cursing through hole parts for forever having to turn the board over to solder them in and them dropping out, or not being straight, actually finding putting the SMD parts easier, that's when you are ready.

Here is one, not particularly well built. I didn't get the chip in straight.
RT5047_Photo.JPG
RT5047_Photo.JPG (769.71 KiB) Viewed 11037 times
R4 and R5 are pull down resistors and need to be fitted in the latest Winterhill PCB. Initially these resistors were on the main PCB but Brian realised that if we kept them on the module, he could detect in software if a module was plugged in or not, which might be useful in future.

Mike

G4WIM
Posts: 379
Joined: Thu Jan 29, 2015 8:36 pm

Re: RT5047 U3 and U4

Post by G4WIM » Thu Mar 25, 2021 6:40 pm

Hi Noel

fyi I just tried to order two of these pcb's for my Winterhill, but could only buy one.

Question, do they come in pairs for £3.50 ? If so maybe make that a little clearer in the shop ?

73 Tim

Post Reply

Return to “The WinterHill DATV Receiver”