RF-Toolbox Pro 4+

High frequency Tools

Marcus Roskosch

    • 4.9 • 21 Ratings
    • $7.99



Specialized on high frequency electronics for RF professionals, radio amateurs and students.

RF-Toolbox is based on the popular Electronic Toolbox by Marcus Roskosch.

This app contains some of the common tools of Electronic Toolbox but contains a wide range of additional tools, specialized for high frequency electronics, RF professionals, radio amateurs and students.

Currently RF-Toolbox consists of more than 90 tools and like Electronic Toolbox, there are more to come over the time.

Feature list:

■ PCB Trace Width (Internal and external Traces)
■ PCB Trace Resistance
■ PCB Trace Impedance (various trace types e.g. Microstrip, embedded Microstrip, Symmetric and Asymetric Stripline, Wire Microchip, Wire Stripline, Edge Coupled Microstrip and Stripline)
PCB Crosstalk (Microstrip and Stripline)
■ LC L/T/Pi Match calculation
■ Coax Cable calculation (Standard and individual Types)
■ Amplifier and Attenuator cascade calculation
■ SWR / Reflection / Return loss conversion
■ Power Divider (Branchline, Ratrace and Wilkinson)
■ Capacitor Plate calculation
■ RLC Parallel, Series and Circuit calculation
■ Noise Figure conversion
■ Skin Depth calculation (various materials from Aluminum to Silver)
■ Butterworth Filter (also with plot of filter chart)
■ Chebyshev Filter (also with plot of filter chart)
■ R-C, L-C, R-L High/Low/Band-Pass Filter
■ RF Units conversion (quick conversion of frequently used units)
■ Air coil inductance calculation
■ Resistors, Capacitors, Inductors in Parallel / Series
And there is much more...
■ Aktive Filter calculation tool
■ Antenna calculation tool
■ Delta Star calculation
■ Cable length / ampacity tool
■ PTC / NTC Temperature Resistance conversion
■ AC Ohms law tool
■ Zener diode circuit calculation
■ Constant current source tool
■ ASCII Table
■ Desktop calculator
■ Resistor/Capacitor/Inductor combinations tool
■ 4-20mA conversion tool ■ Passive cooling calculator
■ Audio Oscilloscope

Please check out more screen shots on my website (WEBSITE Link on the left side).

If you have questions, please feel free to contact me by using the Support button here, inside the App or on my website.

Thank you!

Marcus Roskosch

What’s New

Version 14.5.01

This update includes the following changes and fixes:

◉ Further improvements for a next iOS Version

◉ Some bug fixes and improvements

◉ Several changes under the hood

Thanks for your great support and feedback which helps to further improve this App.

Please use the Contact Developer feature inside the App to contact me in case of questions or issues.

Stay safe and healthy!

Best regards,


Ratings and Reviews

4.9 out of 5
21 Ratings

21 Ratings

Avengerman14s ,

Electronics and RF Tools

WOW....... After a 30 year break I decided to get back into Ham Radio and Electronics I stated in Boy scouts. Needless to say my math skills were never great and now pretty much gone, my military service took its toll.

A few years ago I looked for this type of software but nothing like these were available, but tonight I found these two sets of tools and about hit the floor when I opened them, for me and others without an EE degree these tools include everything I need to not only troubleshoot equipment but now I think I’ll be able to build my own.

I cannot say enough good things about these, check them out you won’t be sorry. Now if someone could develop programming tools for ATMELs and PICs I’ll be in heaven.

Thank you for developing these awesome apps.


Powerup777 ,

Second to none

I'm a lifetime electronics technician and can testify this is what gets you going in the right direction for most of your formula needs. I appreciate that the developer continues to support the app for well over a year since I bought it. Bugs squashed before I knew it was a problem.

Skullcracka ,

Incredible app!

This app is a breath of fresh air! Every time I'm in the middle of a project & I'm stumped, this app comes to the rescue. Unlike the ARRL handbook there is no wasted, high minded verbiage to sift through. Answers come quickly! Well thought out. Love it

App Privacy

The developer, Marcus Roskosch, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

    Up to six family members can use this app with Family Sharing enabled.

More By This Developer

Electronic Toolbox Pro
iCluster - DX-Cluster database
SDR-Control Mobile
SmartSDR™ - FlexRadio Systems®

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