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Old Jun 03, 2012, 01:15 PM
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Quote:
Originally Posted by IceWind View Post
If that tuner is the same as mine, it has no RSSI pin and you'll need to solder it.
I'll see if I can find a photo I took when I did that to mine.
That would be awesome!!!
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Old Jun 03, 2012, 02:00 PM
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Here you go:





Max - 0.4v
Min - 4.80v

Hope it helps as you may have a different tuner.

PS: Yes I've swapped my SAW filter.
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Old Jun 03, 2012, 02:13 PM
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Awesome IceWind!!!

Question, is that main chip ID TA8804F?
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Old Jun 03, 2012, 02:24 PM
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Thank you, found the Pin. Now I need to do some serious testing. Will report my findings.


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Last edited by rimshotcopter; Jun 03, 2012 at 03:23 PM. Reason: Updated the Picture with RSSI
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Old Jun 03, 2012, 02:31 PM
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nop, mine is the TDA8012
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Old Jun 03, 2012, 02:32 PM
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nop, mine is the TDA8012
Thank you, your comment placed me on the right direction to locating mines.
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Old Jun 03, 2012, 03:17 PM
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check to see if pin 19 is connected to one of these spots. Makes for an easy add on.
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Last edited by Martin Y; Jul 08, 2014 at 09:16 AM.
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Old Jun 03, 2012, 03:19 PM
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check to see if pin 19 is connected to one of these spots. Makes for an easy add on.
Yeap, we are thinking on the same track. It is connected to that first hole there and I added a pin there.

I guess I should update that picture.
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Old Jun 05, 2012, 09:00 AM
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Update: I just finished testing the voltage of the above RX and it measures .86 volts with the transmitter turned off and 3.86 with the transmitter ON. Well within the range to read on an Arduino analog port however, I believe it would be wise to use an LM358 to buffer the signal.
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Old Jun 05, 2012, 10:09 AM
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I don't think the tuner's send out a PWM signal, it should be a stable analog voltage.
Sometime ago I made some simple code to a arduino read it and show in a LCD and it was smooth and stable.
Have to try it again.
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Old Jun 05, 2012, 10:14 AM
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Quote:
Originally Posted by IceWind View Post
I don't think the tuner's send out a PWM signal, it should be a stable analog voltage.
Sometime ago I made some simple code to a arduino read it and show in a LCD and it was smooth and stable.
Have to try it again.
Well, sorry for the misinterpretation here, what I was implying is, the output voltage from the RX is within the voltage range to feed directly to an Arduino port without supporting circuitry however, it would be safer to use an LM358 to eliminate any possible draw down or excessive load on the RX.
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Old Jun 05, 2012, 10:15 AM
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I tried a lm358 without much luck. Tell us how it goes.
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Old Jun 05, 2012, 11:02 AM
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I tried a lm358 without much luck. Tell us how it goes.
Question, did you use it to buffer the signal as shown in this drawing?
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Old Jun 05, 2012, 11:59 AM
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No.
Test it, maybe it do the trick.
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Old Jun 05, 2012, 12:01 PM
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No.
Test it, maybe it do the trick.
Will do and report back. Need to build a new buffer, the existing one is an amplifying and not a voltage follower.
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