RF range problem

[George]

I would have thought that if it was transmitting flawlessly at close range and not at range then it's a transmission fault - not a comms fault

This is how I'm transmitting -

SEROUT PortA.0,0,[$AA,$AA,$AA,$AA,$AA,"A",timeset,1]

this is how i'm receiving:

serin PORTA.3,0,["A"],timeset,b1

[George]

Sorted the problem out finally, the problem is I had a 330 ohm resistor on the supply to the receiver chip, it says to do this in the datasheet if you are intending on using it on 5V - I removed the resistor and ran it on 3V and it works a treat, I might put a couple diodes on it to drop the voltage a little in future.

Thanks for helping out

[Ron Marcus]

What modules are you using?

[George]

LINX 418-LR modules - i ended up running three diodes to the supply of the RX module to drop the voltage - also have a 4.7 Tant to help level supply. The thing works great - I can get 300m now line of sight with just a couple bits of wire for an aerial. I have a 1/4 wave with a very small ground plane on the TX and a full wave with no ground plane on the RX