TS-430 Modifications

Speech Processor

The type of speech processor in the TS-430 is an AGC (Automatic Gain Control) driven audio frequency amplifier. By decreasing the time constant substantially, the speech processing effect will be improved. The modification is very simple. Replace capacitor c104, a 4.5 uf on the if board, with a smaller value of 0.47 uf.

To modify this capacitor:

Remove the if board as indicated for the cw filter installation.
Remove C104 from the board.
Mount a 0.47 uf capacitor on the board.
Mount the if board as indicated by cw filter installation.
Adjust the mic gain without the processor until normal alc indication.
Switch the processor on and adjust VR7 near C104 until normal alc indication. (Do not alter the mic gain at this time)

Enjoy the speech processor improvement.

FROM KF4NJ JOHN............RELAYED BY...N0KGX..GENE

MARS and CAP

For MARS and CAP transmit capability, a minor change is required:

Unplug the DC power cable.
Remove the top and bottom covers of the set.
Locate the RF unit connector 10. Diode D39 is near the connector (labeled D39 on the circuit board). Take a small pair of diagonal cutters and clip the lead at the top of the bend.
Locate IC-2 on the Control Unit, under the IF unit. Resistor R148 is near IC-2, clip the resistor lead.
This completes the modification. Reassemble the unit, being careful not to pinch any leads.

Be careful not to transmit out-of-band, or accidentally operate on any non-amateur frequency, unless you are authorized to do so.

RELAYED BY...N0KGX...GENE