squelch doesn't seem the way to go

[eng.alamin]

you know if you use hardware UART your code will be much better in this case

i already advised you to use pic's hardware UART in my first replay

anyway any thing hard for first time don't be frustrated

i don't know which pic that you use , so i assumed that you use pic16f877a

here is small code will guide to use HARDWARE UART with pic basic pro

'small code for my friend 
'eng.alamin
'------------------------

buffer var byte [10]  ' your stream buffers  
 x  var byte  ' for counter
SPBRG = 12 ' 4800 clock must be 4MHz (sorry my friend but it's not inverted )

RCSTA = %10010000  ' Enable RX
TXSTA = %00100000  '    //    TX

main

low porta.0   '  disable your sqaulch circuit ;)
gosub  lunix 
gosub  pc

lunix:
if pir1.5 = 1 then     ' this is the wicked :)

high porta.0    'Enable sqaulch circuit

buffer[0]  = RCREG

endif
return


pc :

if PIR1.4 = 0 then pc   ' wait for loading 

TXREG = buffer[0]     ' send data to your pc

low porta.0   '  disable your sqaulch circuit ;)
return

this program will allow you to receive only one byte and transmit it
edit and modify it according to your circuit to you have to work in loading all in coming data in buffer[x] by increasing x and adding some code line
also you can invert logic by using NPN transistor
ididn't compile this program i just worte it here so you may find dumb mistakes

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regards