JR RF Board ppm wiring

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Wavemeter
Posts: 212
Joined: 16 Feb 2018, 21:22

JR RF Board ppm wiring

Post by Wavemeter »

Hi guys I’m salvaging an 35mhz FM RF board from a redundant JR tx . The RF board works perfectly.
Now this will become the RF stage in a Reeduino Reed Tx.

I need to know the wiring colour code - simple I would have thought : Orange = PPM
Brown = earth and Red = +VE

HOWEVER ! before I connect it up in this fashion my multimeter suggests this is NOT correct!!! Seemingly indicating the reverse

Can somebody sort me out ? :roll:
C99172D5-6FEC-4E25-A066-332A1A5A24A9.jpg
B99CBC4F-98D4-462C-824B-B82524839B27.jpg
Reconstituted boy
bluejets
Posts: 316
Joined: 19 Jun 2019, 04:09

Re: JR RF Board ppm wiring

Post by bluejets »

How did you test with the multimeter?
Which multimeter?
What settings did you use?
One would imagine tracing the brown back to the battery negative would be sufficient.
If using a low ohm setting on the multimeter, it is possible your meter (whatever it is) might be supplying enough bias to turn on certain semi's and give you an apparent incorrect reading.
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Wayne_H
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Location: Temora, NSW. Australia
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Re: JR RF Board ppm wiring

Post by Wayne_H »

Jonathan,

I found similar when I did my Ceptimus (i.e Martin) "super" s/c tx build into a Controlair Mule case. The JR RF board I used is slightly different to yours (mine is 29 Mhz FM) - you can see that I changed the wiring to more conventional colours so I wouldn't trip myself up later on :oops: I've labeled the pin connections on the board.
from bottom of board, pins are negative, signal & positive
from bottom of board, pins are negative, signal & positive
JR RF board connections.jpg (86.86 KiB) Viewed 1705 times
internals 2 RF boards.jpg
Regardless, as Bluejets said, chase the orange wire back to the main board - it should go to ground if its the same as mine.

Good luck ;)
Cheers,

Wayne
Once a Retrobate, always a Retrobate............ ;)
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ozrs
Posts: 114
Joined: 16 Feb 2018, 15:21
Location: West Australia

Re: JR RF Board ppm wiring

Post by ozrs »

on my 36mhz, from bottom of board: pos sig neg

Same as Wayne's - noting that Wayne's is installed upside down in the Mule.
Richard
bluejets
Posts: 316
Joined: 19 Jun 2019, 04:09

Re: JR RF Board ppm wiring

Post by bluejets »

Seems a fairly conventional wiring numbering...attached pdf is a JR631 and shows 31 as Positive (off the switch), 32 as Signal and 33 as Ground.

Rotate the pdf and connections are half way down on the left.
I'd suggest you trace your colours back to the main board to verify, even then, I'd double check.
It not that difficult to check.
Attachments
XF631-Polarity.pdf
(82.2 KiB) Downloaded 150 times
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