To measure the filter response (bandwidth and insertion loss), bandwidth amplifier and antenna characteristics? This the power spectrum analyzer with a RF generator 1033 JTGP-D6 this allows. His price is about 50 €, which it is incomparable with VNA and a direct competitor NWT4000.
The principle of the analyzer and use
Principle JTGP 1033-D6 is a simple. The device is equipped with a frequency generator and spectrum analyzer (or at least one log detectors) and the measured feature (commonly called DUT for “the test device”) It is located between both. The scan of the frequency range, a series of measurements, and in return receive the frequency response of the DUT. It includes 2x ADF4351.
If you purchase the device, you get PCB , connecting the USB cable, 2x SMA interface cables and a small bag with three M810 integrated circuit. It is a reserve in case, the wake input spectrum analyzer and damage the circuit.
In the case of, that you want to measure the antenna, You will need a measuring bridge. You can produce by directions OK1UGA or you can purchase. To measure the importance of having quality and burdens, and in this case is not worth saving, but choose a professional product.
It has been successfully tested on the analyzers:
- NWT70 sells BG7TBL
- Simple Spectrum 35M – 4.4G sells BG7TBL
- Simple Spectrum 135M – 4.4G sells BG7TBL
- NWT500-1 sale BG7TBL
- NWT500-2 sale BG7TBL (Na ? 2 NWT500 is now available linear function recording)
- JTGP-1033 (D6 na Aliexpress)
SNASharp integrated analyzers, but have not been tested:
- NWT300 sells BG7TBL
Such a measuring device is certainly interesting for a number of designers or Amateur Radio, not excluding me. He recommended it to me Pavel, OK1PHU. Out of the envelope I JTGP-D6 1033 spectrum analyzer with RF generator joined the netbook HAM-u, which has only Atom processor with 1GB RAM. SNA Sharp device easily detected. It is necessary to calibrate, which is a very simple process and the software guides you through this process. Then you can start measuring.
It is important to know, the RF generator is not running permanently, But on and off the button on PCB. Since I wonder measurement antennas, So I joined the bridge and perform first measurements. Everything worked excellently!
Shortcomings JTGP-1033 D6
JTGP-1033 D6 but it also has shortcomings. by https://vma-satellite.blogspot.com/2019/04/new-simple-spectrum-analyzer-device.html the noise level around -70dBm, which is 10 dB over SMA / NWT analyzers. It is also suggest the deviation input impedance and the possibility of improving the dynamic range http://alloza.eu/david/WordPress3/?p=542
The principle consists in adding an attenuator at the output of the RF generator and analyzer input and edit filters. It requires little skill and some hand in soldering equipment SMD components. The procedure is described on http://alloza.eu/david/WordPress3/?p=542 . Even without however JTGP 1033-D6 excellent measuring device.
I've done these modifications and repeated measurements actually based on something better. JTGP-D6 1033 spectrum analyzer with RF generator I forgot to aluminum boxes Hammond HA1455J1202 purchased in GM Electronics, which I obviously shortened. In order to turn on and off the RF generator, It was supplemented button on the front panel and LED indicator. Front and rear panel was designed in Corel Draw, printed on self-adhesive foil. This was glued to the panel, sprayed with several layers of clearcoat and additionally fixed with original handles.
JTGP 1033-D6 is an excellent helper, I recommend that everyone structurally oriented VHF / UHF / SHF radio amateur. You can purchase it for example through Ebay or AliExpress-in.