Overview
The Axisflying TERK 1.2G 4W Analog VTX is a high‑power wireless video transmitter designed for long‑range flights. This VTX offers multi‑level RF output, precise PLL frequency control, and robust thermal management with an aluminum alloy three‑layer shell and a large centrifugal fan to maintain stable transmission power.
Key Features
- Up to 4W transmitter power with multi‑level adjustment (PIT/25mW/200mW/2W/4W).
- Efficient PA with power calibration for consistent output across all channels.
- Customized digital PLL circuit and chip‑level integration with no frequency drift.
- Aluminum alloy three‑layer shell and large centrifugal fan for effective heat dissipation.
- Wide input voltage: DC +7V~30V; onboard DC +5V output.
- IRC TRAMP video transmission protocol; IRC control supported.
- SMA 50 Ohms antenna interface.
Specifications
| Input voltage | DC +7V~30V |
| Output voltage | DC +5V |
| Video Transmission Protocol | IRC TRAMP |
| Frequency band | 1080~1360MHZ |
| Channel customer | 16 |
| Channel Frequency | A: 1080/1120/1160/1200/1240/1280/1320/1360MHz; B: 1080/1120/1160/1200/1258/1280/1320/1360MHz |
| Modulation type | FM |
| Frequency control | PLL |
| Frequency Stability | ±100KHz (TyP.) |
| Frequency precision | ±200KHz (TyP.) |
| S/N (Fo±3MHz) | >55dBc |
| Antenna Port | SMA 50 Ohms |
| Video input level | 1V±0.2Vp-p type |
| Operating Temperature | -10°C~+60°C |
| Control Protocol | IRC |
| Weight | Approx:40g |
| Profile dimension | 48mm(L)*32mm(W)*19mm(H) |
RF Output
| Channel group | CH1 | CH2 | CH3 | CH4 | CH5 | CH6 | CH7 | CH8 |
| 1.2G Band A (MHz) | 1080 | 1120 | 1160 | 1200 | 1240 | 1280 | 1320 | 1360 |
| 1.2G Band B (MHz) | 1080 | 1120 | 1160 | 1200 | 1258 | 1280 | 1320 | 1360 |
| Power Level | 0 | 1 | 2 | 3 | 4 |
| Values | PIT | 25mW | 200mW | 2W | 4W |
| Min. | -30dBm | 12dBm | 22dBm | 32dBm | 35.5dBm |
| TyP. | -28dBm | 14dBm | 23dBm | 33dBm | 36dBm |
| Max. | -26dBm | 16dBm | 24dBm | 34.5dBm | 37dBm |
| Current @12V | 140mA±20mA | 410mA±30mA | 460mA±40mA | 800mA±50mA | 1.15A±50mA |
Pinout and Controls
| DC IN | Input voltage DC 7V~30V |
| GND | Ground |
| DATA | Remote control signal input, support IRC protocol to SET channel and power |
| 5V OUT | Output voltage DC 5V |
| GND | Ground |
| Video IN | CVBS video signal input (TYP. 1Vp-p @ 75Ohms) |
| Antenna Port | 1.2G Antenna Port (SMA male head inner hole) |
| BAND & channel buttons | Long press 2s to switch channel groups: green LED flashes once (A) or twice (B). Short presses set CH1–CH8, blue LED flashes 1–8 times. |
| Power control button | Long press >2s to activate PIT. Short press 1/2/3/4 times to select 25mW/200mW/2W/4W; red LED flashes accordingly. |
| Blue LED | Channel indicator: flashes 1–8 times for CH1–CH8 |
| Green LED | Frequency group indicator: once for A, twice for B |
| Red LED | Power indicator: long bright for PIT; 1/2/3/4 flashes = 25mW/200mW/2W/4W |
What’s Included
- 1.2G Antenna ×1PC
- 6P*1.0 Connecting cable with plug ×1PC
Precautions
- Confirm the RF output antenna is installed properly before power‑on; otherwise the module may be burned out.
- Ensure correct voltage range and polarity before connecting power.
- Use antennas with good standing wave ratio and gain for longer transmission distance.
- The surface may become hot during image transmission; avoid direct contact.
Details

TERK Analog VTX is a 1.2G 4W transmitter built for long-range flights with power adjustable up to 4W. It includes efficient PA and power calibration for stable output across channels. A custom digital PLL circuit ensures precise, drift-free performance with chip-level integration. Housed in an aluminum alloy three-layer shell with a large centrifugal fan, it delivers superior heat dissipation for consistent transmitting power during extended use.

Axisflying TERK 1.2G 4W Analog VTX dimensions and ports diagram

TERK 1.2G 4W Analog VTX supports 7-30V DC input, 5V output, IRC TRAMP protocol, 1080-1360MHz, 16 channels, FM, PLL, ±100kHz stability, >55dBc SNR, SMA 50Ω antenna, 1V±0.2Vp-p video input, -10°C to +60°C, IRC control, 40g, 48×32×19mm.

RF output specifications for Axisflying TERK 1.2G VTX: 8 channels across two bands, power levels from PIT to 4W, with corresponding dBm values and current consumption at 12V.

TERK 1.2G 4W Analog VTX: power, video, and data connections; 7V–30V voltage range; safety tips for antenna setup, polarity, heat management, and optimal transmission performance.

Pin functions include DC input, ground, data, 5V output, video input, antenna port, channel and power controls, with LED indicators for channel, frequency group, and power levels.

Accessory includes 1.2G antenna and 6P*1.0 connecting cable with plug.

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