RF Technology PA220
Page 11
4
SPECIFICATIONS
4.5 Antenna Impedance
4.5 Antenna Impedance
Nominal load impedance is 50
Ω
SWR 1.5:1 or better. The PA350/500 will operate with
a VSWR of 2:1 at all phase angles. The forward power will reduce as reverse power
rises above acceptable limits, typically at an SWR of about 2.5:1.
4.6 Output Power
Nominally 100 Watts, preset adjustable from 25 to 100. Gain is typically >5dB.
4.6.1
Transmit Duty Cycle
The transmitter is rated for 100% duty cycle (continuous operation) at 50W output for
air temperature below 40C. Derate linearly above 40C to 50% at 60C.
The transmitter is rated for 50% duty cycle at 100W output for air temperature below
40C. Derate linearly above 40C to 5% at 70C.
4.7 Spurious and Harmonics
Less than 1
u
W at any harmonic of the transmit frequency.
4.8 Heatsink Temperature
The heatsink temperature can rise to 80C without affecting operation, except for
derating based on air-temperature as noted in section 4.6.1 above. Shutdown will occur
at heatsink temperatures exceeding approximately 90C.
4.9 ALC Output
The ALC is intended for connection to the T500. It supplies a voltage which decreases
with increasing power or temperature. Voltages below 6V should reduce drive power,
at a rate of approximately 6~dB/Volt, with voltages below 1V producing a minimum of
25~dB attenuation.
4.10 Connectors
4.10.1
RF Input
The RF drive is delivered via a BNC connector. The maximum power that should be
applied to this connector is 32 Watts.
