NWT-200 Sweep Generator Signal Generator RF Power Meter DDS AD9951 Measuring Range 50KHz-200MHz

NWT-200 Sweep Generator Signal Generator RF Power Meter DDS AD9951 Measuring Range 50KHz-200MHz

1. Description:
The circuit of NWT-200 refers to the NWT-200 circuit of German Ham DL1ALT, and has been optimized and improved accordingly.

NWT-200 is a high-precision and high-resolution frequency characteristic tester. It can be used as a signal source and RF power meter. The equipment can be used to test the amplitude-frequency characteristics of filters and RF amplifier circuits. In addition, it has an ultra-high test resolution of 1Hz. At the same time, many domestic and foreign experts also use NWT series equipment to test VSWR, inductance, capacitance, and RF power.

2. Circuit structure (powered by computer usb port):
NWT-200 adopts ft232+pic16f876a+ad9951+ad8307 circuit structure scheme

3. Technical parameters:
- Working current of the whole machine: 170mA~270mA (three groups of relays in the machine are turned on)
- Dynamic range: better than 80dB
- Background noise: -76dBm (50Ω impedance)
- Measurement frequency range: 50kHz~200MHz (the lower limit of the circuit has been changed from the original 100kHz to 50kHz)
- Measurement frequency resolution: 1Hz
- Five built-in attenuation: 10, 20, 30, 40, 50dB attenuation

4. Use method:
NWT-200 is connected to a personal computer through a usb cable, and the corresponding NWT test software is installed on the computer for measurement, featuring portability and space saving.


5. User interface:

6. Does NWT-200 need an extra power supply?
No, it doesn't. Just use the power supply that comes with the computer usb cable.

7.Circuit shielding effect:
- During the production process of NWT-200, the board has been modified many times, and the shielding of the whole machine has been optimized to the greatest extent. There is no need to add any redundant shielding iron shell and other materials on the pcb board. At the same time, the shielding effect of the entire pcb board in the aluminum casing is also excellent, and it will not be affected by the aluminum casing.
- The shielding performance of the NWT-200 frequency sweeper depends on the flatness of the open-circuit sweep curve. Normally, it should be a horizontal curve.

9. Materials of the product:
The NWT-200 uses a thickened aluminum casing, an all-copper BNC socket and a double-sided military-grade circuit board.

10. Included accessories:

11. NWT-200 first edition output frequency oscilloscope test chart (by TDS430a):

12. NWT-200 Test Examples:
455KHz ceramic filter amplitude frequency curve


10.7MHz ceramic filter amplitude frequency curve


16.934MHz crystal oscillator measurement curve


13. NWT-200 output frequency spectrum analyzer test chart (by GSP-810):
120MHz sine wave signal output spectrum


199MHz, 50MHz and 10.7MHz sine wave signal output spectrum

Package Included:
- 1 x Signal Generator
- 1 x USB Cable (Dual-magnetic Ring)
- 2 x BNC to SMA Plugs
- 2 x SMA Cables (Double Connectors)