HamAntCal 3.5

HamAntCal Version 3.5 (Ham Antenna Calculator) is a reliable and user-friendly tool for calculating the starting length of antennas in feet/inches or metric units. With its intuitive interface, it simplifies the process of antenna construction.

This update brings several significant enhancements:

• HamAntCal is now compatible with the 64-bit architecture and iPhone X.
• An updated interface and settings menu offer a more streamlined user experience.
• The addition of in-app purchases allows for the integration of advanced features.
• For optimal performance, this update requires iOS 8.2 and above.

Key features of HamAntCal include:

• Supports both feet/inches and metric units.
• Calculates starting lengths for various antenna types, including "Dipoles," "Verticals," and "Inverted Vees."
• Dedicated page for calculating 1/8, 1/4, 1/2, 5/8, and "Full Wave" lengths.

The developers have taken great care to address the complexities surrounding the calculation of "Inverted Vee" antennas. Extensive testing was conducted to validate the accuracy of the calculations. The inclusion of a slider in the "Inverted Vee" calculator allows users to adjust the angle from 45 degrees down to 20 degrees, ensuring precise results. Interestingly, lowering the ends of the antenna increased resonant frequency, necessitating an increase in length to maintain resonance at the same frequency as a dipole.

Despite its effectiveness, it's important to note that no antenna calculator can provide exact measurements for every scenario. Factors such as wire type, height above ground, surrounding objects, and ground conditions all affect performance. Therefore, it is advisable to add some extra wire during construction and fine-tune the antenna after installation using an antenna analyzer or SWR meter.

The calculator covers a frequency range of 30 kHz to 500 MHz for "Dipole," "Vertical," and "Length" calculations. The "Inverted Vee" calculator supports frequencies up to 60 MHz.

As a starting point for antenna construction, this calculator proves invaluable. However, users should understand that proper matching methods will be necessary for optimal performance, especially at VHF and higher frequencies where even minor changes in length or diameter can significantly impact resonant frequency.

Safety is paramount when building antennas, and it is vital to observe appropriate precautions. Always use the recommended safety equipment and ensure that your antenna avoids contact with power lines. Safety should be a top priority throughout the entire construction process.

Although this calculator has yielded positive results, it is important to note that outcomes may vary. To account for any discrepancies, it is advisable to add extra wire and trim the antenna to the desired frequency. The developer welcomes feedback, suggestions, and ideas for improvement or expansion of features in HamAntCal.