A frequency agile 2 transistor 7 MHz FM exciter
4,982 views · Published 11 August 2018 · 3:52 · Indexed 23 September 2026
Channel: Amateur Radio VK3YE · 2018 · Science & Technology
Very few people use HF FM even though it's easy to generate. It's not a QRP mode as it's less efficient than SSB or DSB. But if signals are strong the audio quality can be excellent. This video describes a frequency agile 2 transistor exciter using a 7.2 MHz ceramic resonator. See my previous video (Frequency modulating a crystal oscillator for 147 MHz FM) for more information on the circuit. It could be used as the basis of a transmitter for 7 MHz FM experiments (best during the day as there's less interference). You may even be able to link it to a VHF or UHF FM rig to make a crossband repeater. PS: If you liked this video please consider supporting Amateur Radio VK3YE by: * Subscribing on YouTube, * Checking my books page at https://books.vk3ye.com * Shopping on Amazon via: https://amzn.to/3iiDQXv, or * Shopping on eBay via: https://ebay.us/i9DuWP (then if you buy something I'll get a small commission at no cost to you)
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