4 hours ago
Since this question is already answered in a different post, here is my 20 euro antenna:
1. I bought 11 m of 2×0.75 mm² copper speaker wire.
2. I separated it into two individual wires.
3. I made a frame from three 80 cm wooden battens, crossing at the centre at 90°—like a Czech hedgehog or “anti-tank cross.” and made some cuts at the ends to guide the wire. Also drilled some holes at the end for some tie wraps that hold the wires in place.
4. I wound each wire three times around the frame, creating two loops at 90° to each other.
5. I connected one loop to H1+/H1− and the other to H2+/H2− on preamplifier PCB 23.1.
6. I left both solder jumpers open.
7. I connected the preamplifier to my System Blue Mini and left the controller on its automatic settings.
Both channels are working, with an almost identical noise floor of approximately 13–14 mVpp.
It may not be the most elegant antenna ever built, but it was cheap, simple, and it works!
![[Image: antenne.png]](https://alexfrankes.nl/skycam/antenne.png)
1. I bought 11 m of 2×0.75 mm² copper speaker wire.
2. I separated it into two individual wires.
3. I made a frame from three 80 cm wooden battens, crossing at the centre at 90°—like a Czech hedgehog or “anti-tank cross.” and made some cuts at the ends to guide the wire. Also drilled some holes at the end for some tie wraps that hold the wires in place.
4. I wound each wire three times around the frame, creating two loops at 90° to each other.
5. I connected one loop to H1+/H1− and the other to H2+/H2− on preamplifier PCB 23.1.
6. I left both solder jumpers open.
7. I connected the preamplifier to my System Blue Mini and left the controller on its automatic settings.
Both channels are working, with an almost identical noise floor of approximately 13–14 mVpp.
It may not be the most elegant antenna ever built, but it was cheap, simple, and it works!