Visit RFCafe.com Thanks for visiting RFCafe.net Thanks for visiting the RF Cafe Archives Thank you for visiting RF Cafe Thank you for visiting the RF Cafe Archives!

Loran Antenna - RF Cafe Forums

The original RF Cafe Forums were shut down in late 2012 due to maintenance issues - primarily having to spend time purging garbage posts from the board. At some point I might start the RF Cafe Forums again if the phpBB software gets better at filtering spam.

Below are the old forum threads, including responses to the original posts.

-- Amateur Radio
-- Anecdotes, Gripes & Humor
-- Antennas
-- CAE, CAD, & Software
-- Circuits & Components
-- Employment & Interviews
-- Miscellany
-- Swap Shop
-- Systems
-- Test & Measurement
-- Webmaster

Orcus
 Post subject: Loran Antenna
Posted: Mon Dec 05, 2005 9:53 am 
Hi
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.





Posted  11/12/2012