User's Manual

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RF Technology T800 Page 7
2 TRANSMITTER INTERNAL JUMPER OPTIONS
2 Transmitter Internal Jumper Options
In the following subsections
an asterisk (*) signifies the standard (Ex-Factory) configuration
of a jumper.
2.1 JP2: EPROM Type
Condition Position
27C256 2-3 *
27C64 1-2
2.2 JP3: 600 Ohm Line Dc Loop PTT Input
By default, Eclipse exciters can be keyed up by pulling the PTT signal low, or by dc loop
signalling on the audio pair.
This jumper enables or disables this second method.
Condition Position
dc loop connected (enabled) 1-2 *
dc loop not connected (bypassed) 2-3
2.3 JP4: Audio Input Source Selection
Either the 600Ω or the high-Z balanced inputs may be selected.
Condition Position
600Ω Input
2-3 *
High-impedance Input 1-2
2.4 JP5: 600 ¿ Termination
Normally the Line Input is terminated in 600 ¿ . The 600 ohm termination can be removed
by choosing the alternate position.
Condition Position
600¿ Termination 1-2*
No Termination 2-3