Topband: pre-amp placement

[ko7i]

I manage a EMC test lab in the Seattle area. Typically we place a LNA pre-amp at the DRG Horn we use for Radiated RF Emissions measurements above 1GHz. Below 1Ghz, we place a pre-amp at our measurement receiver - not the antenna. Assuming a ham is using properly terminated double shielded CATV 75 ohm coax for the RX antenna, the insertion loss of the coax should be less than 2db for a 200 ft run. I find it hard to believe a ham would be able to "hear" the difference between pre-amp locations during real live operating conditions. If a ham wants to further improve the noise figure of their LNA, they would be well served by placing a bandpass filter, for the band of interest, at the front end of the pre-amp. Vy 73 de KO7I Sent from my Galaxy