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AIS Antenna
A careful search in made for the optimum directional AIS receive antenna for a shore station. The result is surprising
post 16 Sep 2024
Antenna for UHF VHF Links →
HB9CV Antenne
I was able to set a maximum standing wave ratio of 1: 1.1 at 144.300 MHz. The HB9CV works really well.
Helix antenna for 2 metre satellite
Construction of the helix antenna is mechanically a little more difficult than a Yagi and requires a reflector behind it to function properly
Homebrew 24Ghz Yagi
Build this wi-fi antenna when you want results FAST and have just a few inexpensive tools and supplies available
J Antenne For 2m
A J antenna in fact a ZEPP antenna can be considered as a whole wave radiator with one dipole half (=1/2) folded
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I was able to set a maximum standing wave ratio of 1: 1.1 at 144.300 MHz. The HB9CV works really well.
Construction of the helix antenna is mechanically a little more difficult than a Yagi and requires a reflector behind it to function properly
Build this wi-fi antenna when you want results FAST and have just a few inexpensive tools and supplies available
A J antenna in fact a ZEPP antenna can be considered as a whole wave radiator with one dipole half (=1/2) folded
23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency
50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection
30 Volt Computer Power Supply Stack A bonus was that i discovered that these did not need a standby load connected to the supply to keep them running just apply mains power and close the Start lead to ground