Remote and Microphone Extension Cables for the FTM-400

Remote and Microphone Extension Cables for the
Information on building extension cables for the FTM­400 microphone and remote control head. Thanks to Chuck, K0ORK for contributions to this document! DO NOT COPY AND POST THIS DOCUMENT TO ANOTHER SITE. General Comments
The cable and connector quality is extremely important. A poor connection or a poor crimp can cause the cable not to work. You must use the correct crimp tool or you will have problems. The connectors must also fit tightly into the plugs. If they are loose you will have intermittent connections. Both the control head and the microphone are extremely sensitive to marginal connections. Most extension adapters are cheap and do not make adequate contact. If the extension can be pulled apart or if either RJ­45 connector is loose, you will have problems. Crimping the Connectors
Explain XPYC and RJ notation TBD ­ instructions and photos on how to crimp the connectors Control Head Extension Cable
The control head cable uses a 4­conductor cable with an RJ­11 4P4C at each end. Be careful, the RJ­11 6P4C's are very common but they are too wide for the plug. This is the same connector used in a wired phone headset ­ but with only two conductors (4P2C). The cable carries power and serial digital data which travels between the remote display panel and the radio. The radio will not operate without a connection to the remote display. The length of the cable is limited by IR voltage drop on the cable and by increasing distortion of the digital signal. It is suggested that the cables be made as short as practical for your installation. Lengths greater than about 7 meters (20 feet) may be problematic. If you see erratic behavior on the remote display, immediately shut down and verify that your cable is good. Operating with an erratic display may result in returning the radio to Yaesu. You can build your own custom­length cables or buy them. (See links below) It is recommended that you never attach or detach the remote display while the radio is powered on. Microphone Extension Cable
The microphone uses RJ­11 6P6C connectors. This is not the same as an Ethernet connector. You'll also need a double­female to extend the cable. We have never found an Ethernet adapter that works! K9EQ-Fusion-PDF-0005
Rev. 1 18-Mar-2015 1 of 4 You can either buy pre­assembled cables or make your own to your custom length. This may be necessary if you need to feed the cable through an opening bigger than the RJ­11/12 connector. To make a microphone extension cable you will need: ● An RJ­11 crimping tool with a 6P6C die (fortunately more common than 4P4C) ● RJ­11 6P6C crimp connectors ● Six conductor cable, flat cable is easier to cut, strip, and crimp To build the microphone extension adapter: ● Two RJ­11 6P6C modular jacks ● Surface mount modular housing for the modular sockets ● Two RJ­11 6P6C modular sockets Put two RJ­11 6P6C sockets in the modular housing and wire them together with the provided tool. It is very important that there be minimal resistance added by the sockets. The microphone transmits keypad presses by generating two different voltages. If the voltage is wrong, the keypad will not work. An RJ­45 Ethernet crimp tool won't work. RJ­45 jacks won't work ­ they do not provide a tight fit and result in intermittent connections. Pre-made Components
It’s possible to save some money and buy pre­made cables, however the choice of lengths is limited. 4-conductor RJ-11 4P4C cables
7’ RJ­11 4P4C Straight Wired Cable 15’ RJ­11 4P4C Straight Wired Cable 25’ RJ­11 4P4C Straight Wired Cable 6-conductor RJ-11/12 6P6C cables
7’ RJ­11/12 6P6C Straight Wired Cable 15’ RJ­11/12 6P6C Straight Wired Cable 25’ RJ­11/12 6P6C Straight Wired Cable Where to get parts
Some of the hardware you need won’t be available locally, so you might as well plan on making an Internet order. Once your friends know you can make extension cables, you may find new friends and achieve great popularity, so order enough to make a bunch of cables. The following parts are available on Amazon by following the provided links: Crimp tool for 4P4C​
(one) RJ­11 4P4C jacks​
(two) Flat, 4­conductor wire​
(500’) Crimp tool for 6P6C​
(one) Even if you buy pre­made cables, you will need the following RJ­11 6P6C jacks​
(two) RJ­11 6P6C Keystone Jacks​
(two) K9EQ-Fusion-PDF-0005
Rev. 1 18-Mar-2015 2 of 4 Modular Housing​
(one) Flat, 6­conductor wire​
(100’) Flat, 6­conductor wire​
(1000’) PS If you type these numbers into Amazon you can get the parts premade. #019927 RJ12­6 pin mod inline coupler straight This connects the mic to the extension cable #X000N8BLB7 RJ12­6 conductor straight telephone cable 7ft extension cable. I used the 7 ft long cable on my Tacoma install and found it a little short. You want to measure and get the length you need. Please remember that the Yaesu mic uses different resistances to get the different functions so keep the cable as short as you can. K9EQ-Fusion-PDF-0005
Rev. 1 18-Mar-2015 3 of 4 Disclaimer
This document was authored by K9EQ. You use the information in this document at your own risk. Whatever happens to your radio including failure to function, malfunction, generation of interference, spontaneous combustion, electric shock, emotional stress, divorce, loss of friends, clinical depression and tying up repeaters complaining about K9EQ and his documents, before or after viewing this document is your responsibility. While there is absolutely no blame on our part for any error we make, no matter how stupid or unkind, your suggestions or corrections to this document are appreciated and will be considered for inclusion in the next version. Copyright
This document is Copyright 2015 by K9EQ and All rights reserved. You may use this document as you wish providing its use does not violate any law or Yaesu published instructions. If you transmit this document to another person by any means, it must remain unaltered from the original. Encorage others to obtain this document via direct download from​
­ and thus ensuring retrieval of the latest version. You may modify your own version with your own notes, but are then prohibited from distributing that version. DO NOT COPY AND POST THIS DOCUMENT TO ANOTHER SITE.​
It is constantly being updated and freezing the document in time would be a disservice to the community. Rather link to this document at:­Fusion­PDF­0005_Extension_Cables.pdf This URL will not change. K9EQ-Fusion-PDF-0005
Rev. 1 18-Mar-2015 4 of 4 
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