The amplifier never overloaded, it was scanners who did that and needed an extra filter. I've used a PGA103+ based amplifier at work where I where next to Stockholms tallest building with at least 25 channels at work, and I couldn't detect any problem when having the amplifier before the filter. It is when aircrafts are far away that you'll need that coverage and that will be close to the horizon. They don't need to direct their signal upwards as you can use any type of antenna for that kind of range. I've been to several remote sites for air traffic controllers and looked at the local radio antennas at airports, and they mostly use standard dipole or GP antennas. You don't mention what antenna you are using and where it is installed or what receiver type you have. ![]() Note: This line accounts for both the height of the airport's transmit antennas and my receive antenna. Would this situation benefit from a preamp after the filter, perhaps with a variable attenuator? If so, what preamp might you suggest? (Bonus points if it uses N connectors.) They want Signals aiming slightly upward toward the horizon, with coverage only in their area of concern. Logically and unfortunately, height is almost an enemy for airport transmitters. As a result, I know very little about VHF/UHF preamplification. In the VHF/UHF world, all of the popular local repeaters are on absurdly tall towers, I can get into them with full quieting using a 1 watt handheld in my basement. I use my HF radio's attenuation way more frequently than I use it's preamplification. ![]() I want my S-meter reading close to zero when no signal is present. In the ham world, my goal is to lower the noise floor as much as possible. ![]() Most of my experience is as a ham, as such, I see preamplification as a tool to be used with caution. It only opens the squelch occasionally, so even the carrier is weak. I can hear them, but they're way down in the noise. This building and this little patch of earth are the only things keeping me from receiving my local tower and ground frequencies clearly.
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