'TRANSMIT
INCLUDE "modedefs.bas"
DEFINE OSC 20 'use external 20mhz crystal
CMCON = 7 : ANSEL = 0 : ADCON1 = 7
DEFINE LCD_DREG PORTA ' Set LCD Data port
DEFINE LCD_DBIT 0 ' Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_RSREG PORTB ' Set LCD Register Select port
DEFINE LCD_RSBIT 1 ' Set LCD Register Select bit
DEFINE LCD_EREG PORTB ' Set LCD Enable port
DEFINE LCD_EBIT 0 ' Set LCD Enable bit
DEFINE LCD_BITS 4 ' Set LCD bus size (4 or 8 bits)
DEFINE LCD_LINES 2 ' Set number of lines on LCD

DEFINE LCD_RWREG ----------------DEFINE YOUR RW REGISTER
DEFINE LCD_RWBIT ----------------DEFINE YOUR RW REGISTER

trisb.2 = 0 : trisb.3 = 1 : dq var portb.4 : temp var word : tempf var word
pause 2500

loop:
lcdout $fe , $c0 , "Getting..."
owout DQ , 1 , [ $cc ] : owout DQ , 0 , [ $44 ] : Pause 500
owout DQ , 1 , [ $cc ] : owout DQ , 0 , [ $be ]
owin DQ , 0 , [ temp.LOWBYTE , temp.HIGHBYTE , skip 6 ]
tempf = temp * 9 : tempf = tempf / 5 : tempf = tempf + 32
lcdout $fe , $c0 , "Displaying"
lcdout $fe , $80 , "Tc=" , DEC temp , "C,Tf=" , DEC tempf , "F.."
lcdout $fe , $c0 , "Sending..." : serout portb.2 , n2400 , [ temp, tempf ]
lcdout $fe , $c0 , "Data Sent."
goto loop
End


'RECEIVE
INCLUDE "modedefs.bas"
DEFINE OSC 20 'use external 20mhz crystal
CMCON = 7 : ANSEL = 0 : ADCON1 = 7
DEFINE LCD_DREG PORTA ' Set LCD Data port
DEFINE LCD_DBIT 0 ' Set starting Data bit (0 or 4) if 4-bit bus
DEFINE LCD_RSREG PORTB ' Set LCD Register Select port
DEFINE LCD_RSBIT 1 ' Set LCD Register Select bit
DEFINE LCD_EREG PORTB ' Set LCD Enable port
DEFINE LCD_EBIT 0 ' Set LCD Enable bit
DEFINE LCD_BITS 4 ' Set LCD bus size (4 or 8 bits)
DEFINE LCD_LINES 2 ' Set number of lines on LCD

DEFINE LCD_RWREG ----------------DEFINE YOUR RW REGISTER
DEFINE LCD_RWBIT ----------------DEFINE YOUR RW REGISTER

temp var word : tempf var word : pause 2500
loop:
lcdout $fe , $c0 , "Waiting..."
serin portB.3 , n2400 , 1000 , loop , [ temp , tempf ]
lcdout $fe , $c0 , "Received.." : lcdout $fe , $c0 , "Displaying"
lcdout $fe , $80 , "Tc=" , DEC temp , "C,Tf=" , DEC tempf , ".."
lcdout $fe , $c0 , "Displayed."
goto loop
End



Little steps like I told you before...
Get the basics working. Add in the temperature correction code after you get the basic temperature displayed. Blow on the element, make it change, get it 'in the ballpark'. Forget about the encoding/decoding. If you can't get temp to be displayed as it is without the wireless, how are you going to get it to work with the wireless? Magic? Me thinks not...
Make your LCD work for you. Notice I added a bunch of lines telling me what the PIC is doing. Use them often!
And you had your C to F conversion backwards, and there was no way your original program was going to work. You had your decoding happening after you displayed the results. If you're going to send the whole code, send the whole code.
Post back when this works. If it doesn't work, you've got other problems, hardware.