benbiles
Member level 4
Hi,
I am trying to design a true diversity radio mic receiver with roughly this spec.
power = 3volts
RF UHF 550mhz - 700mhz ( minimum 606.5mhz - 613.5mhz 10 channels )
Bandwidth 200khz per channel
Dual receiver & antenna
WBFM demodulator IC mono ?
audio output at 300mv ( THD less than 0.1% )
Compander ( expander ) 4:1 ? possibly THAT 4316
Low power Pic micro-controller with small LCD display for;
Frequency selection 25khz steps
Compander settings maybe
Monitor RSSI level from each receiver and switch modulator to receiver with higher signal
The PIC would need to be able to read rssi and change frequencies of the PLL
Would a hard switch of the RF from receiver to receiver create a click in demodulated audio?
should I fast pan from one RF receiver to another an back etc to the demodulator IC?
Is there such a think as a soft switch? I read somewhere in a patent that sure where using diode switches to make a soft switch?
My question is does anyone know of a good low power RF IC with integrated PLL rssi etc that can work in these frequencies ?
Many I have found so far such as TI cc1101 or adf1720-1 all transmit FSK etc.. but I'm looking to use the receiver for wbfm !
Also, any good choices for a WBFM demodulator IC mono ?
any ideas would be greatly appreciated!
thanks, ben
I am trying to design a true diversity radio mic receiver with roughly this spec.
power = 3volts
RF UHF 550mhz - 700mhz ( minimum 606.5mhz - 613.5mhz 10 channels )
Bandwidth 200khz per channel
Dual receiver & antenna
WBFM demodulator IC mono ?
audio output at 300mv ( THD less than 0.1% )
Compander ( expander ) 4:1 ? possibly THAT 4316
Low power Pic micro-controller with small LCD display for;
Frequency selection 25khz steps
Compander settings maybe
Monitor RSSI level from each receiver and switch modulator to receiver with higher signal
The PIC would need to be able to read rssi and change frequencies of the PLL
Would a hard switch of the RF from receiver to receiver create a click in demodulated audio?
should I fast pan from one RF receiver to another an back etc to the demodulator IC?
Is there such a think as a soft switch? I read somewhere in a patent that sure where using diode switches to make a soft switch?
My question is does anyone know of a good low power RF IC with integrated PLL rssi etc that can work in these frequencies ?
Many I have found so far such as TI cc1101 or adf1720-1 all transmit FSK etc.. but I'm looking to use the receiver for wbfm !
Also, any good choices for a WBFM demodulator IC mono ?
any ideas would be greatly appreciated!
thanks, ben