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preston MDR 3 board query


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#1 joe mcnally

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Posted 27 December 2014 - 01:18 PM

Just wondered if anyone knows of or has one of these boards sitting around they could photo please

Im just trying to put this board into an MDR 2

The board was given to me with the aerial mounting separated from the board and now I have no reference to where or what the centre pin of the aerial connects to :(

Any help greatly appreciated

All best

Joe

Attached Files

  • Attached File  mdr1.JPG   156.68KB   5 downloads
  • Attached File  mdr2.JPG   158.48KB   4 downloads

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#2 Jarrett P. Morgan

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Posted 30 December 2014 - 10:00 AM

I will take pictures when I get back to LA on the 1st if you still need them.


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#3 joe mcnally

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Posted 30 December 2014 - 10:08 AM

Hi Jarrett

yes pleeeeaaase

Happy New Year

Joe


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#4 Lee Kazista

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Posted 30 December 2014 - 10:36 AM

The external antenna attaches to the post.  Set it into the MDR so that the channel selector is visible through the plastic window and attach the 4 screws.


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#5 joe mcnally

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Posted 30 December 2014 - 10:46 AM

Hi Lee

thanks for the reply

I see what you're saying but its the internal ( the circuit board side ) that's has been separated and no reference as to what the centre pin was soldered to .

Thanks all the same

Joe 

 


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#6 joe mcnally

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Posted 19 January 2015 - 04:34 AM

just another request for this please before I give up and send it in :)


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#7 Marc Alfonso

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Posted 19 January 2015 - 04:38 PM

Hello Joe:

 

I have images for you and can email them direct to you as I cannot seem to get them to upload here on the forum.

 

You will have to solder to the Centre Pin of the RF connector to the centre PCB Board land and not the ones that are close by on either side.

 

Also, what is the easiest method for uploading images on the forum for next time ? I tried to Image to URL converters that are free 

online but the Forum would not allow the extensions. 

 

Marc


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#8 Alan Rencher

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Posted 19 January 2015 - 06:48 PM

Marc,

 

The easiest way is to upload the photo to a server (plc server, or image hosting platform) then copy the image url, and use the image button in the editor: image%2Burl.PNG


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#9 joe mcnally

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Posted 19 January 2015 - 07:28 PM

Hi Marc, that's very kind of you

My email is joe@joesjibs.co.uk

If you have a moment to do that it would be great please

All best

JOe


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#10 joe mcnally

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Posted 19 January 2015 - 07:36 PM

Marc, when I posted the pics above I started a new topic and a box at the bottom asks if you want to add files I just pressed there and it goes straight to my computer files then I chose the MDR board and that was it simple

When replying like now there is no dialogue for that so may you could just start a new topic MDR pics Topic :)

Cheers

Joe


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#11 Marc Alfonso

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Posted 19 January 2015 - 11:13 PM

Thanks Alan,   it worked using Imgur.com

 

Joe,

 

See the trace that goes to the 6 pin RF Filter labelled FLT1 that is your RF Connection point. 

 

You will have to solder to the Centre Pin of the RF connector to the centre PCB Board land and not the ones that are close by on either side. 

 

I pulled the SMA connector so that you can get a better view of the PCB land that you will have to attach to.

 

Just remember that we are at 2.4Ghz here so take care both not for overheat the trace as well as NOT placing a large solder blob at the connection point as both will lead to RF impedance mis-match and could decrease your range. You probably will get away with it somewhat seeing as the PCB is a fiberglass FR4 0.062" which works ok at these frequencies.

 

 

 

9cLnY1p.jpg

 

 

 

 

 

 

m1OYYoe.jpg

 

( Please disregard the Capacitor above the label L41. fixed that after I took the photo )

 

Hope that this does help.

 

Marc


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#12 joe mcnally

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Posted 20 January 2015 - 02:55 PM

Hi Marc

that picture and info was indeed very helpful

Just spent a fun hour or so doing what you suggested and all seems to working as it should now ..... really happy and great this forum has such helpful members

Hope I can help too as we go along

All very best

Joe McNally


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#13 Jarrett P. Morgan

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Posted 20 January 2015 - 06:10 PM

Joe,

Sorry I wasn't able to help you out! 

 

I am glad Marc was able to; they are great over at PLC


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#14 joe mcnally

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Posted 21 January 2015 - 05:54 PM

Thank Jarrett

no problem whatsoever and thanks for your offer

Cheers

Joe


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