YAESU TV-736 ATV MODULATOR/DEMODULATOR
The TV-736 is a fast-scan television modulator/demodulator designed for use with the FT-736R Transceiver equipped with the optional 1.2 GHz Band Module. Black and white or color Amateur Television (ATV) reception is provided when an external video monitor is connected to the TV-736, and transmission is possible when an external video camera is connected. Double sideband (A3F) mode can be used either alone or with an FM audio subcarrier (F3E, selected by an internal jumper).
Emission Mode Selection
The TV-736 is set for the video+audio mode at the factory. For color transmission, this requires a total bandwidth of 9 MHz. If you want or need to transmit video without the FM subcarrier, remove the bottom panel (see "Bottom Panel Removal" on page 3) and connect the two halves of the (cut) jumper wire near T14 (shown below). Keep the bottom cover off for now.
Mode Select Jumper Location
Connect the two cables from the TV-736 to the FT-736R as shown above: the red plug connects nearest the rear of the transceiver.
If you have a video monitor or a TV with a baseband (composite) video input jack, connect the TV-736 VIDEO OUT jack to the monitor's video input jack using 75-ohm coaxial cable (peak video level is 1 Vp-p @75 ohms). If your TV has no video input jack, you will need to install a video modulator (not supplied by Yaesu) between the TV-736 and the TV's antenna jack.
Connect your camera's video output line to the TV-736 VIDEO IN jack. Camera output level should be 1 Vp-p @75 ohms impedance.
For audio subcarrier operation, connect your camera's audio output line to the TV-736 AUDIO IN jack. Audio output from the camera should be 500mV peak @600 ohms impedance. Also, connect TV-736 AUDIO OUT jack to the audio input of your monitor, or to an external audio amplifier. Audio output level is also 500mV peak @600 ohms.
If your camera does not have a microphone, or if you wish to connect another microphone (200 to 10k ohms), connect it to the MIC jack on the rear of the TV-736.
Operation
Before operating the TV-736 for the first time, the bottom cover must be removed to allow access to video input level trimmer VR04. See "Bottom Panel Removal".
After selecting the mode of emission (videoonly, or with audio) by the jumper described previously, and connecting your camera and monitor, switch on the transceiver and the TV-736 POWER switch.
Set the FT-736R to the 1.2 GHz band, and select either the FM or an SSB mode (operation is the same in these mode). Set the METER selector knob to the S/PO position.
With your camera still turned off, press the MOX button to transmit a carrier, and adjust the RF POWER control on the TV-736 so that the FT-736R meter deflects to "8" on the PO scale.
Now (while still transmitting) switch on the camera and adjust VR04 inside the bottom panel (see photo at right) for the desired contrast on the monitor.
The AUDIO control on the front panel of the TV-736 adjusts the audio level from the camera, if your camera includes a microphone and if it is connected to the AUDIO IN jack on the TV-736. The MIC control adjusts the audio level if a microphone is connected to the MIC jack on the TV-736.
Video Input Level Adjustment
To receive, press the MOX button on the transceiver so that it returns to the undepressed position. Adjust the RF GAIN control, as necessary, for best picture.
NOTE: the DRIVE and MIC gain controls on the FT-736R are disabled when the TV-736 is operating. Just turn off the TV-736 POWER switch to operate the transceiver in other modes.
Bottom Panel Removal
The bottom panel of the TV-736 is secured by two plastic rivets at the front ("A" in the photo on the next page), and two screws ("B"). Pull the rivet pins all the way out to release them, and then remove the two screws. Replace the bottom panel after adjusting VR04 to obtain proper contrast with your camera.
AF Gain for MIC Jack
- 3 -
SPECIFICATIONS
Operating frequency range: 1240-1300 MHz (w/FT-736R & FEX-736-1.2)
Modes of emission: A3F, or A3F+F3E
Transmitter modulation method: Amplitude Modulation
Video carrier output frequency (IF): 133.810 MHz
Audio carrier output frequency (IF): 138.310 MHz
Video and audio carrier stability: ±10ppm
Maximum audio (FM) deviation: ±25 kHz
Maximum total bandwidth: 9 MHz
Spurious emissions: less than -50dB
Peak video input level: 1 Vp-p @75 ohms (typical)
Peak audio input level: 500 mVrms @600 ohms (typical)
Peak video output level: 1 Vp-p @75 ohms (typical)
Peak audio output level: 500 mVrms @600 ohms (typical)
Operating voltage: 13.8 VDC (from FEX-736-1.2 module)
Operating temperature range: 0 to +40°C
Size (WHD): 167 x 35 x 170.5mm
Weight: 800 grams
YAESU MUSEN CO., LTD. C.P.O. BOX 1500 TOKYO, JAPAN
_ 4 _
Loading...