![]() # Long Wire AntennasĪ long wire antenna is not a random wire. The Apex 303WA-2 is more shortwave friendly and as this is a passive antenna, no gain can be gained. The Apex 303WA-2 is a Japanese made long, medium and shortwave passive antenna with low noise. ![]() ![]() However, there are some who believe that the PA0RDT Mini Whip is not a good performer, and in fact this is because many people do not install it in the correct way.įor information on how to properly install a PA0RDT Mini Whip antenna, please refer to the installation guide at /blog/2020/10/how-to-properly-install-a-mini-whip-antenna-in-an-noisy-urban-environment/ (opens new window) for the installation guide. The PA0RDT Mini Whip is an active antenna that is lightweight and portable, and can receive the frequencies covered by the FlyDog SDR with good reception, making it suitable for installation in tight spaces such as balconies. # Whip and Probe Antenna # PA0RDT Mini Whip ![]() MegaLoop MLA-30 Active Magnetic Loop Antenna.Active antennas are smaller and provide a certain degree of sensitivity, but they also increase background noise passive antennas have a lower background noise, but require a larger site to set up.ĭepending on the usage scenario (urban buildings, rural areas), users can choose to use either active or passive antennas.īelow are the recommended loop antennas for use by the FlyDog SDR Project. There are two types of loop antennas, passive and active. The FlyDog SDR demo site (opens new window) uses a SkyLoop loop antenna. # Loop AntennasĪ loop antenna provides excellent reception of long, medium and short waves without the need for a ground grid or grounding. For LF it seems SNR is key and it isn't obvious that a bigger antenna or more gain will help.A good pair of antennas can greatly improve the reception of the FlyDog SDR. I also made a ferrite-sleeve-loop, and a ~1m diameter coax-loop, but haven't had time to test them properly. Anyway the mini-whip seems to perform quite well and is significantly easier to find space for than the 35-40m wire! For the TDF signal at 162 kHz the tuned long-wire provides almost the same signal as the amplified mini-whip. ![]() The long-wire has a tuning coil for resonance at 136 kHz - so the comparison isn't entirely apples to apples. I just tested the original PA0RDT design against a long-wire (around 35m IIRC), looking at some LF time-code signals. There is an updated cricuit by PA0NHC that uses BF998 for the first FET: and also a version by RA0SMS, for sale on e-bay. ![]()
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