What is the minimum operating frequency other than the datasheet?
Can it be operated at 20 MHz?
Yes Pulsed mode Duty Rate 100ms~1000ms
At 20MHz, 47dBm or 50dBm is not possible. The part needs at least 15~20dB derating from its rated power and this requires a new characterization.
ADRF5160 could be operated below 0.7GHz, however compression and IP3 would degrade.
What is your power requirement? Is it pulsed or CW?
Is it the pulse duration or repetition rate?
Also what is your required power ?
Power Range CW 50W ~ Peak 100W