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Active Loop Antenna

Posted: Mon Jul 10, 2017 2:27 pm
by P-40 Warhawk
I found a active loop antenna for receivers on ebay and the loop has a 950 ohm resister in the wire run that makes up the loop . I emailed the seller and asked what the 950 ohm resister was for , he didn't know , he was just selling them . Does anybody in this forum know why the 950 ohm is the loop ?????????
Here is a website with the antenna on it , but no reason why the resister is in the loop .


www.ra0sms.ru/p/rx-antenna-flag-fo0aaa-with-preamp.html

Re: Active Loop Antenna

Posted: Tue Jul 11, 2017 11:35 am
by rtlsdrblog
I believe that's a termination resistor. Basically in a small loop antenna it helps create a directional radiation pattern, so the antenna receives better from one side.

Re: Active Loop Antenna

Posted: Sun Aug 13, 2017 8:57 am
by m_a_x
I don't know this antenna but it is not a magnetic loop antenna. The magnetic loop antenna has very low impedance, could be around 1 ohm, so it need a specific preamplifier with low input impedance.