I was just looking over the specs of these receivers and noticed that the rssi output is now an analog voltage unlike its predecessors which gave a pwm output.
I hadn't noticed anyone else mention this and had just assumed it was still pwm.
I've got one in my unfinished skywalker, originally I fitted a D8R-II which I used a rc filter to convert the pwm to analog and after swapping it out for the X8R I left the filter in place, guess I can remove it and recalibrate the rssi on the minimosd now.
Chris
It's not analogue, it's PWM. The original manuals and specs said it was, but they've been re-issued, and it's definately PWM. I know having plugged it into an OSD expecting analogue voltage, and having it basically not work.
I wrote to FrSky and asked them what was up - who just said, it's PWM, and sent me a screen shot of a capacitor and an resistor wired up as a filter.
Ok, thought it a bit odd why I hadn't previously read about it. Guess I'll leave my rc filter in place then.
Cheers
Chris
It's one of the things that annoys me.
Why not just do a voltage!
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Quote from: rob.thomson on February 05, 2014, 09:37:29 AM
It's one of the things that annoys me.
Why not just do a voltage!
Sent from my GT-I9300 using Tapatalk
Various reasons.
1 the mcu may not have a DAC.
2 If it does have a DAC then its output will need a buffer amplifier to drive down long lines. More expense and bigger pcb.
Digital output are much less fussy and can provide a reasonable good current output direct from the MCU port in most cases.
You did ask :)
regards
Andy