Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would
be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate
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Below are all of the forum threads, including all
the responses to the original posts.
Post subject: Loran Antenna
Posted: Mon Dec 05, 2005 9:53 am
I am trying to receive Loran (100 KHz) signal using H field and E field antenna.
E field antenna has o/p impedance 50 ohms and a gain of 20 dB. I pass this signal through a LNA
(30 dB gain) and then BPF and I get a very clean loran signal.
The H field antenna has o/p
impedance 50 ohms and a gain of 20 dB. I pass this signal through the same circuit and then I pass
it through another 30 dB gain amplifier (as H field recieved signals are weaker than E field
received ). I dont get a clean loran signal.. It is pretty messed up.
I know that my second
amplifier works good as I have tested it with the E field antenna.
What is the problem. Is
H field antenna highly sensitive and hence it picks up a lot of noise, reflections.
impedance matching could be a problem... but then the E field works with the same circuit.
Please guide me on this problem.