User's Manual

RF
Technology T350/T500
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: Dc Loop PTT
This jumper enables or disables the keying of the PTT function by means of a dc signal
passed down the 600
W line input pair. When enabled, JP9-JP11
control how the dc
signal is configured with respect to an internal opto-coupler.
Condition Position
dc loop connected (enabled) 1-2 *
dc loop not connected (bypassed)
2-3
2.3 JP4: Audio Input Source
Either the 600W
or the high-Z balanced inputs may be selected.
Condition Position
600W Input
2-3 *
High-impedance Input
1-2
2.4 JP6: Input Level Attenuation
This jumper permits coarse input sensitivity to be set.
Condition Position
0dB attenuation 1-2 *
20dB attenuation 2-3