Daniels VT-3/140-SWA2, Instruction Manual

Page: 59 / 262

Transmitter Main Board Instruction Manual 3-13
input to the transmitter to be used to gain access to the SUBTONE INPUT 2 which
connects to the PHASE MOD IN input of a modified synthesizer.
• Make sure J13 and J16 are not installed.
Figure 3-1 Transmitter Audio Processor Low Frequency Modulation.
REMOVE
R47
REPLACE WITH
10 uF
+
SHORT TOP TWO PINS
MT3TXMNM7
MT-3 Transmitter Audio Processor (board version 43-911914 through 43-911916)
• Install jumpers: JU38Y, JU35Y
• Remove jumpers: JU27X, JU27Y, JU31, JU35X, JU37, JU38X
• Short pins P4-1 and P4-3 (or install J23) together with a short piece of 22 or 24 gauge
solid wire and solder (see figure 3-1). This allows the DIRECT MODULATION input
to the transmitter to be used to gain access to the SUBTONE INPUT 2 which connects to
the PHASE MOD IN input of a modified synthesizer.
Note that the SUBTONE 2 input should not be used while this modification is in effect. Note also
that adjusting R44 has no effect on the deviation of the low frequency signal.
MT-3 Transmitter Audio Processor (board version 43-911918)
• Contact factory for configuration.
3.11.3Synthesizer and Crystal Controlled Oscillator
Refer to the manual for the Oscillator used in your Transmitter for the required Low Frequency
Modulation modifications.