1750Hz tone generator using 74HC4060 - Electronics-Lab.com
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Générateur 1750Hz pour micro Kenwood MC44 - Le blog de Stéphane - F4HDWLe blog de Stéphane – F4HDW
1750Hz toneburst – Davidmpye.com
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Call Tone Generator | Elektor Magazine
Transmitting A 1750 Hz Tone - Kenwood TM-D710A Manual [Page 6] | ManualsLib
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ARES Alerting Using the 1750 Hz European Burst Tone