AV-1 KM HANDSFREE PTT CAR KIT
Wiring for C.B. transceivers with 4-pin microphone connector.
The highway code in many countries prohibits the use of transceivers while driving. In order to continue using a ham radio transceiver while driving, a hands-free kit is necessary that does not distract the driver and leaves their hands free.
The AV-1KM hands-free kit consists of a microphone placed at the end of a long "gooseneck", a convenient PTT switch, and a cable suitable for the radio model in use. The microphone is usually fixed on the sun visor inside the car; thanks to the long and flexible gooseneck, the microphone can be positioned so that it does not obstruct the view. The bistable PTT is installed in a suitable position, such as the gear stick. Due to the bistable function of the switch, it is sufficient to touch it very briefly; the hand movement is the same as changing gear. If the radio offers the Vox function, this can, of course, be used.
The AV-1KM hands-free kit is supplied with different cables, each suitable for a certain transceiver model or manufacturer. This greatly facilitates quick installation, no cable soldering is required. The microphone is an Electret type (AKA capacitor type), the necessary supply voltage is taken from the radio's microphone connector. This type of microphone is used by almost all vehicular FM transceivers. With the exact position of the microphone close to the mouth, most ambient noises can be suppressed. The microphone gain can be easily adjusted for the best modulation. The PTT switch box also offers other controls such as Up/Down buttons, if the radio supports these functions. A red LED indicates the PTT status, which helps to avoid involuntary transmissions.
The basic AV-1KM hands-free kit contains the cable for the radio with the modular (RJ) connector. This is the most used cable for mobile FM transceivers. For Icom or Kenwood radios with an 8-pin round connector (Foster), an additional adapter cable is required.
Flexible boom microphone, unidirectional, with volume control.
Mounting bracket for sun visor
Box with PTT and controls attachable to the gear stick with velcro belt.
DC power from the microphone jack of your radio.
UP / DOWN directly from the PTT box.
Hands-free PTT with VOX function
Adjustable Mic Gain.
Flex Microphone: 230 mm (L) x 8mm diameter
PTT box cable <> Microphone: 3m
PTT box cable <> Radio: 1.5m
PTT box dimensions: 54 (L) x 22 (H) x 69 (diameter) mm.
Warning:
The microphone mounts under the sun visor partition bolt. Make sure it is securely connected and the cable is safely routed. Make sure the microphone is angled so it does not interfere with forward vision.
