Modify 1,2GHz A/V receiver for FPV

I bought this Kit Wireless 700mW from Securitycamera2000 , This kit is used for CCTV and also for FPV,although only 4 channels, my idea is to modify it to expand the frequency transmission and reception.
Original Channels:
1 1080MHZ
2 1120MHZ
3 1160MHZ
4 1200MHZ

I started to modify the circuit of the receiver,the main board contains the video amplifier, the audio demodulator and the microcontroller to control the PLL inside tuner module.

This module is as found in the old analog satellite receivers,the PLL is the TA1322FN chip, also contains down converter circuit is very similar in programming the SP5055,in my tuner the address selection pin is grounded.

Details pins for tuner module

Controller core is the PIC16F628A, a 16x2 display and 4 buttons for setting.

FEATURES
 900MHz to 1300MHz frequency
 Step 250KHz, 1MHz, 5MHz and 10MHz (Up Date 20/02/2012)
 Supports up to 8 pre-set frequencies
 Button lock mode
 Automatic shutdown of the display backlight after 10 seconds
 4 adjustment button:
 Button up: frequency up
 Button down: frequency down
 Step button: short touch = change step / touch along = locks
 Memory button: short touch=call preset channels/ long=records in memory / lock mode =unlocking three hits

Hex file and schematic  available  here 

Any questions or comments please do not hesitate to contact to the email josuezb81@gmail.com , I can also customize the text on the second line display and the frequency range.

Watch my FPV Receiver's video here http://www.youtube.com/watch?v=bwVUDE7nAi0&feature=mfu_in_order&list=UL



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Visit my blog about DATV in spanish.

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