Hi all,

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I have documentation on the Syncal 2000, but I am looking for any and all documentation on the TA4793 which is the 100W VIU/amplifier and DC-DC converter for the Syncal 2000.

If you have such documentation, please contact me.

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For starters, I’m keen to know, which pin on the TA4793 is +24V and which pin is ground.

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Additionally, I would like to accomplish interfacing the VIU with a US-based VIC-3 system. It seems the VIU has provisions for a harness interface, but any of the pictures of these units seem to be lacking this option. I am investigating whether I can just use 2^nd audio connector on the radio, or whether it is better to install a connector where the harness connector is located.

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To interface with the VIC-3, I simply need PTT input (grounded to activate), fixed-audio input and fixed-audio output for the radio/VIU.

The VIC-3 radio interface has the following specifications:

• INPUT - 150 ohms ±10%, 220 mVrms
• OUTPUT - 820 ohms ±10%, 1.4 Vrms
• FREQUENCY RESPONSE - 300 Hz to 4.2 kHz
• PTT OUTPUT - Open collector, closure to ground. 35 V max. 50 mA max

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Thanks and Happy New Year!

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73 Eugene W2HX
My Youtube Channel:?

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