Nwt-200 Sweeper Single Sideband Filter Shortwave Signal Source Nwt 200 Amplitude Frequency | Бытовая техника

Nwt-200 Sweeper Single Sideband Filter Shortwave Signal Source Nwt 200 Amplitude Frequency | Бытовая техника

NWT-200 The circuit refers to German ham.DL1ALTOfNWT-200Circuit，The corresponding optimization and improvement have been carried out.。

1，NWT-200What equipment is it?？

NWT-200It's a high precision machine.、High Resolution Frequency Characteristic Tester，It also has the function of signal source and radio frequency power meter.。The popular application of this device is that it can be tested, such as filters.、Amplitude and Frequency Characteristics of RF Amplifier Circuit，Simultaneously possessing1HzUltra-high test resolution。At the same time, many experts at home and abroad also use it.NWTSeries of equipment to test standing wave ratio、inductance、Capacitance、Radio Frequency Power and Functions as Signal Source。

2，NWT-200circuit structure（ComputerusbPort power supply）

NWT-200Useft232+pic16f876a+ad9951

+ad8307Circuit structure scheme。

3，NWT-200technical parameter

Working current of the whole machine：170mA~270mA（Three sets of relays in the machine turn on Qi）；

dynamic range：Be better than75dB；

bottom Noise：-80dBm（50Euclidean impedance）；

Measurement frequency range：100KHz~200MHz；

Measuring Frequency Resolution：1Hz。

4，NWT-200Approximate usage

NWT-200adoptusbWire-connected PC，And install the corresponding on the personal computerNWTTesting software for measurement，It has the advantages of portability and space saving.。

5，NWT-200Using Interface Diagrams

6，NWT-200Do you need extra power?

NWT-200No additional power supply is required.，Just use the computer.usbThe power supply provided by the cable is enough.。

7，NWT-200Circuit Shielding Effect

NWT-200Three alterations were made during the production process.，Maximum optimization has been achieved in the shielding of the whole machine.，pcbThere is no need to add any extra shielding iron shell and other materials on the board.，meanwhilepcbThe shielding effect of the whole board in the aluminium shell is also excellent.，Not affected by aluminium housing。

8，NWT-200Internal circuit board

9，NWT-200Materials used

NWT-200Use Thickened Aluminum Shell，Total copperbncSocket，Double-sided Military Circuit Board。

10，NWT-200Attachments

Double magnetic ringsusbA line、bncturnsmaTwo plugs、Double headsmaTwo lines。

11，NWT-200First Edition Output Frequency Oscilloscope Test Chart（The new version has better phase noise than this one.）

12，NWT-200Test sample

455KHzAmplitude-Frequency Curve of Ceramic Filter

10.7MHzAmplitude-Frequency Curve of Ceramic Filter

16.934MHzCrystal Vibration Measurement Curve

13，NWT-200Test Chart of Output Frequency Spectrum Analyser