RF Amplification: Is it a Bad Idea?

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SUMMARY

The discussion centers on the challenges of using a 1-watt RF amplifier to enhance Wi-Fi signal strength over a distance of 1.2KM. The user experienced degraded performance with the amplifier, despite it being a linear device that adds 10dBi to receive sensitivity. In contrast, a stock 1-watt Wi-Fi bridge provided superior throughput of 38Mbps and a full RSSI indicator. The consensus suggests that RF amplifiers may amplify noise, leading to poorer performance compared to optimized stock solutions.

PREREQUISITES
  • Understanding of RF amplification principles
  • Familiarity with Wi-Fi bridge technology
  • Knowledge of directional and omnidirectional antennas
  • Experience with signal strength measurement (RSSI)
NEXT STEPS
  • Research the impact of RF noise on signal quality
  • Explore alternative Wi-Fi bridging solutions, such as Ubiquiti NanoStation
  • Learn about antenna gain and its effects on Wi-Fi performance
  • Investigate the specifications and performance of Atheros chipsets in networking devices
USEFUL FOR

This discussion is beneficial for network engineers, RF technicians, and anyone involved in optimizing long-distance Wi-Fi connections.

robotnut
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My home is about 1.2KM LOS from work. I want to use my work's internet connection at home. I have a pole available as well. Right now from rooftop to rooftop, I do get a signal but it's weak and goes off sometimes. I'm using a 200MW wifi bridge. So at a recommendation of a friend, I got a 1watt amplifier to stay license free. It is a 2 way amp also adding 10dbi to the receive sensitivity. The manufacturer says it's linear, giving me 1 watt with 200mw input. The issue however is that with the amp, reception and speed gets even worse... I tried reducing my power to 100mw which would reduce the output of the amps as well but no luck. The performance is worse with the amp and directional antennas than with no amp and 9db omnis.
Anyway since I haven't been able to make it work, I got a new 1 watt bridge and that works very well. I'm getting 38mbps throughput and a full RSSI indicator with dishes on both rooftops.

The question, is this a bad amp, or trying to use RF amps is generally a bad idea? It's funny how the stock 1watt bridge works like a charm, but the amplified one doesn't at all even tho they're both built around the same atheros chip. I guess a 2 way amp also amplifies noise?
 
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