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Wideband 70-cms FM Exciter

With 130 mW output power

Wideband 70-cms FM Exciter
Most amateur radio transmitters are not actually designed for transmitting wideband audio signals with high fidelity. However, the wideband 70-cms (430–440 MHz) FM exciter described here is up to the task, with an audio bandwidth of 20 Hz to 100 kHz. With the right antennas, antenna height and possibly an amplifier, you can easily make QSO’s (connections) over a distance of tens of miles, or even as much as 200 miles under the right weather conditions, though an amateur radio license of the appropriate class is needed to operate this exciter.
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CAM/CAD data for the PCB referred to in this article is available as a Gerber file. Elektor Members can exclusively download these files for free as part of their Membership. Gerber files allow a PCB to be produced on an appropriate device available locally, or through an online PCB manufacturing service. Elektor recommends its business partner Eurocircuits as the company of choice for its own prototypes and volume production in selected cases.

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