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Receive Antennas (below 30MHz) - For all topics related to receive antennas used on HF, MW, LW, etc. For transmit antennas use the Amateur Radio Antennas forum.

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  #21 (permalink)  
Old 03-26-2017, 2:15 PM
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It's like trying to get money out of the tax department....
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  #22 (permalink)  
Old 03-26-2017, 4:33 PM
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I'm pretty sure he's using an upconverter
I dont use it everytime. You can receive it when you switch to q branch in SDR#.
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Old 03-26-2017, 7:05 PM
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Baluns and balanced antennas are effective for removing common mode interference. For example your SDR and computer generate a lot of RF noise. With an unbalanced feedline that noise can travel up the shield of the coaxial cable, radiates and becomes part of the spectrum the antenna picks up and the receiver sees. If you use a balun and isolate the antenna from the coax, there is less noise picked up by the antenna.
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Old 03-28-2017, 9:24 PM
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While that's quite true, the OP isn't necessarily looking for RFI isolation - he's looking to be able to feed his SDR using the AN200 loop. To do this, he's going to need to use a balun to change the balanced output of the loop to an unbalanced output that his SDR can accept.

Doing some very simple digging on YouTube, I found a British ham who evidently was using his AN200 on a Alinco R8E desktop (yes, that's not a SDR but, at least in this case, an unbalanced load is an unbalanced load, regardless of the receiver type). In the video, he states that the loop's impedance is in excess of 1 kohm (I suspect it may be much higher than that, but the video tells the story). To get the R8E to accept the input coming from the AN200, he had to use a binocular balun with a ratio of 16:1, confirming my suspicion that a simple 9:1 magnetic balun wouldn't provide enough transformation.. Here's the link on YouTube

https://www.youtube.com/watch?v=C1DTsNwdT6Q

Perhaps you can talk to some hams to help you out with this, as it's an unusual value to find in a balun. It won't be easy to find, I suspect, but it also confirms my earlier suspicion that it can be done...Miike
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Old 03-28-2017, 9:50 PM
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And here's 2 YouTube examples of a RTL-SDR being used with an AN-200

https://www.youtube.com/watch?v=kKiHv3lWIJU

https://www.youtube.com/watch?v=_ULbNtLmKyg

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