Some radios need pressing specified buttons to start data upload or download. In MOTOROLA GP-340 connector the output voltage is limited to approximately 3 Volts. Some radios are put in programming cloning mode manually by pressing a specific set of buttons while turning on. It is different from KENWOOD portables connector which is used for other HYT radios. Schematic diagram Connection circuits jacks for mobile radios are shown as they are plugged into sockets GP-340 connector draft by K. Computers with i80486 are recommended by VERTEX, iCeleron 433 MHz processor may be also applicable. KPG-87D KEN-2 Pseudo-MOTOROLA GP-680 Valery UA9MRQ R00. Yuri US5IVZ has designed a connector to DRAGON SY-5430 programmable radios.
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