| Ton 1750 Hz w Kenwoodzie TH 78 a |
| TH-78A (U.S.A. version) --> TH78E (European version) MODS. If you bought a TH78A in the USA you don't have the 1750 Hz repeater tone access, but you can change that ! Apart from the well-known six diodes, the new CPU has 2 green wires. In order to use the TH78A in EU, you must do the following: 1. First you have to remove D2 for the standard EU bands (144-146 and 430-440 MHz). 2. Now control that the 2 green wires and the 5 other diodes are installed (D1, D3, D4, D5 and D6). 3. If you need band expantion and components location, please see the mods below. Although the TH78A has a special bandpass filter for the US 70cm band, I could not notice a decrease in sensitivity in the EU part of the 70 cm band. There is a function change for 3 knobs; please see below and also p. 6 and 7 of your INSTRUCTION MANUAL. TH-78A --> TH-78E --------------------------- LAMP --> TONE 1750 Hz CALL --> LAMP TONE --> CALL Now, you can choice between the CTCSS tones and the 1750 Hz with the following sequence: F + LAMP (the new TONE !) and then the right rotary encoder to make your frequency choice. |