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Double 5/8 Flower Pot Antenna


Constructing the antenna using RG59 75 OHM solid dielectric cable and bringing the feed co-axially down through the bottom element as below
post 12 Jun 2024
Double 5/8 Flower Pot Antenna

Antenna for UHF VHF Links

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Antenne halo 144MHz
The antenna support serves as a coaxial antenna supply line

Antenne pour le portable 145mhz
Antenna squelette (skeleton) is neither more nor less than a QUAD antenna, except that in our case it is rectangular

Antenne slim jim 144mhz
Given its very average rigidity it will advantageously be suspended from a polyamide cord stretched between two supports a few meters rom the ground, the feeder coaxial RG 58 freely

Half-Wave Flower Pot Antenna
The 2m Half-Wave version of the antenna. To construct the antenna, first select a suitable length of grey 25mm


23cm Yagi Antenna building

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

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

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