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Electronics Converters and Calculators
Calculators conversion charts and converter programs available for use. Some of these are directly related to interest in the electronics
post 11 Feb 2024
Antenna Calculator Links →
Short tuned vertical with concentrated loading
This is a simple calculator to estimate the Antenna Factor of a short 0.25 l'ambda vertical
Single Band Dipole Calculator
Actual length depends on conductor diameter and end effects
Single layer air core inductor calculator
The calculation is based on the classic Wheeler's formula for single-layer inductance air core, tightly wound
Slim Jim antenna calculator & Slim Jim information
This calculator can be used to design a Slim Jim or a J Pole antenna. The Slim Jim, can be a great portable roll up antenna, if made out of 300? or 450? ladder line twin feeder. A Slim Jim for 2m 145MHz will be 1.5 metres long, and 70cm 433MHz will be 0.5 metres. Alternatively, for permanent installations, the copper tube
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This is a simple calculator to estimate the Antenna Factor of a short 0.25 l'ambda vertical
Actual length depends on conductor diameter and end effects
The calculation is based on the classic Wheeler's formula for single-layer inductance air core, tightly wound
This calculator can be used to design a Slim Jim or a J Pole antenna. The Slim Jim, can be a great portable roll up antenna, if made out of 300? or 450? ladder line twin feeder. A Slim Jim for 2m 145MHz will be 1.5 metres long, and 70cm 433MHz will be 0.5 metres. Alternatively, for permanent installations, the copper tube
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