On 7/20/21 10:15 AM, Donald S Brant Jr wrote:
Kent: Since you are making up for system losses, you could place the amplifier at the receive port as well, or anywhere in the system that it is convenient. As long as you calibrate with the reference antennas (and the amplifier or receiver is not being saturated) the results will be the same. It would increase the susceptibility to interference, though; bandpass filtering would be helpful in this case.
Or both.. They've gotten kind of expensive ($150 each, they used to be $50), but I've made lots of use of the Minicircuits ZX60-4016E for this kind of measurement, with suitable filters. 20M-4G, 18dB gain, P1dB 16.45dBm, 3.5 NF..?? Set up your cal process right, and the amplfiers and filters are "inside the cal".
