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Author Topic: RSSI mod for Corona RP8D1  (Read 18083 times)

Shikra

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RSSI mod for Corona RP8D1
« on: April 24, 2011, 10:21:39 PM »

RSSI output - FPV OSD

Referring to the picture, locate the capacitor covering the chip that the RSSI signal connects too.
Carefully bend the capacitor back 45 degrees - making sure the bend is at the point where the capacitor legs touch the board - not the capacitor itself as the leads are very fragile. You will probably have to remove some hot glue first. Pick it off with a sharp knife bit by bit.
Now locate the loop wire on the chip under the capacitor you just moved and gently scrape along the centre of it to clean ready for soldering.
Now quickly "tin" the loop wire with an iron and some solder. Take care to avoid disconnecting the loop
Now take a servo lead as per the photo and "tin" the end of the red wire ready to solder to the rx.
Place the white wire onto the RSSI loop wire than you cleaned and tinned earlier.
Place the Iron onto the joint until it melts. As soon as it solders onto the wire, remove the iron quickly to avoid the loop wire coming off.
Now put some hot glue around the joint and press the capacitor back down into place.

NOTE: Some OSD's will require a buffer to connect up to the OSD. Depends upon the model. It is always best to use if not sure
To test, measure RSSI voltage. Now connect up to the OSD. If it stays the same then you should be OK without a buffer.
NOTE: Test range before flying




You can make up a buffer circuit if needed using a lm358n as per circuit below.....
Only pins 1-4 and 8 are needed for RSSI. Ignore the resistors and ppm pins unless you are building one for PPM output (and then this is not the best way... ask if you want to know why)

« Last Edit: April 24, 2011, 10:37:54 PM by Shikra »
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mark1975

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Re: RSSI mod for Corona RP8D1
« Reply #1 on: April 24, 2011, 11:04:22 PM »

Many thanks for this ive already done this mod today courtesy of your advice spot on works a treat cheers..
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Coyote

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Re: RSSI mod for Corona RP8D1
« Reply #2 on: April 24, 2011, 11:26:29 PM »

Yes great detail and very usefull thread mate. Thanks for sharing :)
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venquessa

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Re: RSSI mod for Corona RP8D1
« Reply #3 on: April 25, 2011, 11:34:48 AM »

I have the corona's without the loop wire :(
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Shikra

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Re: RSSI mod for Corona RP8D1
« Reply #4 on: April 25, 2011, 11:48:05 AM »

It uses the same pin - Pin 6 on the Phillips chip
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cortex

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Re: RSSI mod for Corona RP8D1
« Reply #5 on: May 18, 2011, 01:41:18 PM »

can someone shed a bit more light on this.
i want to connect my corona to an ez osd for rssi readings. do i just follow these steps?.

http://fpv-japan.com/technical-info/modding-the-corona-72mhz-for-rssi/

 is it just one wire that connects to the corona or three?

where can i get wire that small for pin six on the chip?

 i have seen quite a few pictures with different setups and im a bit confused.

cheers in advance

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Coyote

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Re: RSSI mod for Corona RP8D1
« Reply #6 on: May 18, 2011, 02:55:38 PM »

Ok this might clarify a bit with all the different examples oline.

First a Corona 6 channel :

When you open it up it will look like this :



Then remove the glue carefully :



Carefully pull the cap back out the way to expose the loop :



Solder on to the loop and glue cap back down and your away :)

Now here`s Sean`s Corona RP8D1 :

Totally different connection.

First remove from cover :



Same principle, remove the glue carefully, pull cap back out the way  :



Here`s a larger picture of the chip pin you want to tap off :



Carefully solder fine wire to the pin, make sure not to bridge chip pins :



I then solder a ground to the main boards ground :



I then connect the main RSSI wire the finer wire, heat shrink, then double the cable back so when the hot glue is on it gives the cable strength that the finer cable couldnt take if the wire was ever pulled tight :



Cables glued for strength :



Put it back in box, job done :)

« Last Edit: May 18, 2011, 02:57:09 PM by Coyote »
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sheep600fx

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Re: RSSI mod for Corona RP8D1
« Reply #7 on: May 18, 2011, 04:48:06 PM »

And you wonder why I got you to do it for me, Cracking job and good pictorial. Im sure this will help braver souls than me  :D

Sean.
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seibernator

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Re: RSSI mod for Corona RP8D1
« Reply #8 on: May 18, 2011, 09:55:50 PM »

Just out of interest, how would you connect that back into your OSD? Do you need a particular brand of OSD?
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Coyote

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Re: RSSI mod for Corona RP8D1
« Reply #9 on: May 18, 2011, 10:05:05 PM »

All are different, EZOSD does it through the current sensor, DOSD has pins on its main board etc
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pk-surfing

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Re: RSSI mod for Corona RP8D1
« Reply #10 on: July 30, 2011, 11:03:45 PM »

Good photo's Rich.

I think that 'capacitor' is a crystal though....  :)
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aerofabfrog

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Re: RSSI mod for Corona RP8D1
« Reply #11 on: October 12, 2016, 02:28:20 PM »

HI everybody there!
I wonder if you still use that receiver in that mode with OSD?

and if radio range is similar to without a RSSI output?

Do someone uses that receiver with REMZIBI OSD?

and in that case if any buffer is needed,and if ground is needed too?
thank you
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