Thank you guys for all your replies.
I added the preamble and qualifiers data after reading other posts regarding wireless communications, but it makes no difference if I use control bytes or not.
@Ioannis:
the receveir output is connected on portb.0. The same output goes to the pc through a rs232 level converter(sniff!!). Monitoring the output with the PC I don't loose a single byte.
@Mister_E:
I've tried using the HSERIN instruction, configuring the USART with your great pic multicalc, but results are even worst... I checked on the datasheet, usart rx should be pin 18(portc.7), I will triple check.
Of courseremoving timeout from serin gave no results
and sorry for the schematics, but it's very simple, just the display and the rx as in the code for the receiver side, external 20MHz clock with capacitors and pullup on MCLR, powered at 4.5V from a lab PSU(0-30V 0-5A). Could power be the problem? I'm not working at 5V because receiver datasheet says that max VCC shoud be 4.5V
I can't check the fuses now, they should be the default define for a 16f876a in pbp, just changed osc to hs
@skimask:
I send 4 bytes (2 preambles+1 qualifier +1 data)at least every 2 seconds(there are 2 pause 1000 in the loop) so it should be ok. And of course, when everything will work fine(at least better than this!!!) I will send data 3 or 4 times, as I need to send just 3 bytes I was thinking of calculating a checksum. Sum the 3 bytes, send a word with the sum. The receiver will get the data , sum them and compare the sum with the checksum word sent. Could it be a way of verifying data?
@jerson
Could the tx power switching be a problem even if a rx module alone(just powered and connected to the pc) works fine?
I also reduced serial speed to 1200. same problems.
Maybe I should first try to bypass the lcd and monitor on the pc a serout pin.
I think I went too far for my first picbasic project: a weather station with RTC, pressure bargraph and remote wireless sensor... but everything works fine apart this damn receiver...
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