What is an End Fed Half Wave (EFHW) It’s a multi-band antenna that is a half-wave on the lowest band of your choice. The simple calculation is 144 / f (MHZ) 3.6 MHz = 144/3.5 = 41.15m of wire So we can construct a simple, handy table for construction Freq Length 3.6 MHz 41.15 m […]
In a previous article, I discussed the APRS LoRa 433 MHz project, and how these little units provided an impressive range on +20 dBm or 100mW. The range in the car can or course be optimised by a resonant antenna and the addition of a PA amplifier. The PA suggest its capable of a 13dB […]
On one of our summers days, LEFARS my local club organised a field weekend and it was sunny. The idea was to play some radio in the sun, with multiple stations operating from in the hired field. Members were advised to use band pass filters, this helps keep things friendly to multiple operators. The weekend […]
If you are a licensed amateur radio operator, then the small meshtastic boards can be used for APRS as a fun project. 433 MHz mesh never took off unfortunately, so if you have these boards around, then they can make a great APRS tracker or igate! The good news is you don’t need a NOV […]
Meshtastic has been well documented on other pages, so if you have arrived here you are probably already aware of the mesh network and its usage. This page is going to document my solar powered project and the learning points. 868 MHz is the band of choice now, with virtually no activity on 433 MHz […]
28 MHz has been open most days this solar cycle, and so it’s been my band of choice from the car. The antenna sizes are much more reasonable, so it’s easier to get an antenna mounted on the car that works well. I have a few options, but if static I have a 1/4 wave […]