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
that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views.
It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if
you would like to post something on RF Cafe's
page, please do.
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.
The 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.
I thought impedance matching could be a problem... but then the E field works with the same circuit.
Please guide me on this problem.