MFJ MFJ-624D User Manual

MFJ-624D Telepatch II Hybrid Phone Patch

Thank you for purchasing the MFJ-624D Telepatch II. We believe this phone patch with its unique hybrid design is one of the finest phone patches on the market today. This patch is designed to provide undistorted audio and good receiver to transmitter isolation. The adjustable NULL control allows over 30 dB null in most telephones to provide smooth VOX operation.

Please take the time to completely read the instruction manual to get familiar with the 624D before operating, particularly if you have never operated a phone patch before.

INSTALLATION

The 624D Telepatch IT is designed to remain permanently installed between your transceiver (or transmitter/receiver), your modular telephone, and your receiver's speaker. The telephone and the radio will operate as if the phone patch were not in the circuit when the PATCH IN/BYPASS switch is in the BYPASS (out) position.

I.Connection to Telephone.

A.Disconnect the modular phone from its line cord.

B.Connect the line cord from the wall jack to the modular jack on the Telepatch II labeled LINE.

C. Connect a second line cord from the modular jack on the Telepatch II labeled PHONE to your telephone.

See Figure 1 for pictorial.

II.Connection to Radio.

A. Radios With Patch IN/OUT Connectors

1.Connect a shielded audio cable from AUDIO IN on the Telepatch II to PATCH OUT on the radio.

2.Connect a shielded audio cable from AUDIO OUT on the Telepatch II to PATCH IN on the radio.

3.Connect a microphone to the 8-pin microphone jack on the front panel.

4.Connect a speaker to the speaker out jack of the Telepatch II.

B.Radios Without PATCH IN/PATCH OUT Connectors.

1.Connect a shielded audio cable from the headphones, speaker out, or monitor out jack of the radio to the AUDIO IN jack on the Telepatch II.

2. Connect the 8-pin microphone cable	to the
mic input on your radio.

3.Connect your microphone to the jack of the Telepatch II.

mic input

4.Connect a speaker to the SPEAKER jack on 624D Telepatch II.

FIGURE 1 - INSTALLATION DIAGRAM

C. JUMPER FUNCTIONS.

1. The Telepatch II was shipped from the factory with Headers HD2 and HD3 set for Kenwood, Icom and Alinco radios. If you have a Yeasu or Ranger 3500 radio, change the shorting clips on HD2 and HD3 according to Figure 3.

2. Examine the three jumpers on Headers HD2 and HD3. Confirm that the jumpers are on the headers according to the radio with which you are operating the Telepatch II.

NOTE: If your radio is not listed in TABLE 1, use the header assignment for Icom if your radio uses Pin I for transmit audio. Use the Yaesu assignnment if your radio uses Pin 8 for transmit audio.

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