Jp22: Use Tone- As A Direct Digital Input (Rev 4 Or Higher); Jp23: Connection Of Dmtx Board (Rev 4 Or Higher) - RF Technology T220 Operation And Maintenance Manual

2.13 JP23: Connection of DMTX 2 TRANSMITTER INTERNAL JUMPER OPTIONS
2.12 J P22: Use Tone- as a Dir ect Digital Input (Rev 4 or
Higher )
JP22 is normally shunted with a jumper, which connects Tone- on P3 (pin 18), as the
negative leg of the Tone input pair. Removing this jumper disconnects Tone- from this
path and allows the use of the Tone- pin to be used as a direct digital input. See also
2.9 - JP16: If the jumper is removed, then JP16 should be in the alternative position
(Direct Tone Input)
2.13 J P23: Connection of DMTX Boar d (Rev 4 or Higher )
When the DMTX board is connected to an exciter, there is provision for digital or audio
modulation of the reference oscillator and VCO. The digital signal is input via the DB9
rear connector and the audio input signal is via the Line inputs on the standard DB25
rear panel connector.
Condition Position
N DMTX board 1-2, 5-6*
DMTX board connected 2-3, 4-5
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