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Isotron 40
It has been manufactured for 42 years.
The best way to operate HF.
Easy installation
Excellent performance
Durable construction
CC&R friendly (XYL also)
The Nano-Vector Network Analyzer
Many have purchased these analyzers. They come in a variety of models depending on your needs. They can do a simple to quite extensive analyses of your antenna or network system.
Of course, I am focusing on the simple.
Many of us have these to check our individual antennas. Looking forthe resonant point and why possibly the SWR is not as low as we would like it at resonance. The VNA is capable in determining this in most cases.
                    Setting Up the Analyzer.
The VNA comes with some hardware. Three terminations, open, shorted and load. It also has two short lengths of RG/405 coax and a coupler.
You will need to acquire adapters if you are using UHF or other connectors than SMA. One adapter is at the VNA side and another at the end of the coax you are using.
For a common antenna installation Port 1 (S11) or output port will be the only one to use. Port 2 (S21) is a receiving port.
Connect one RG/405 to Port 1. This will eliminate a strain on the VNA connector.
Put the adapter you need for your coax on the RG/405. Connect your coax. The antenna end of the coax should be open or not connected.
Put another adapter on the end of your coax.
Now you can turn the VNA on.
With the stylus touch the right side of the screen to bring up the menu. Select "Stimulus".
Select "Start". A numbered key pad comes up. Select the lowest frequency you are testing. For example, if you are testing a 40 meter antenna, you may want to select 7M. This is 7 MHz. Then touch "OK". You will see 7.000 Mhz on the bottom left screen.
Back to the menu. Select "Stop". Enter 7.3M, then OK. You will see 7.300 MHz on the right bottom of the screen. You can expand or reduce the span as needed.
On the end of your coax, put the "Open" terminator on. Open your menu. Go back one step so you can see "Cal" and select it. "Calibrate" is on the next window, select it.
Next menu will have "Open" at the top. Select it and wait until it is finished.
Exchange the "Open" terminator for the "Shorted" one. Select "Shorted" Do the same.
Exchange the "Shorted" terminator for the "Load". Select "Load". Do the same.
Go back in the menu. Back again. Select "Recall/Save". Then select "Save". Save your data in one of the "Save files (0 - 4). This way if you turn your VNA off you will not loose your calibration.
Return back to the main menu and select "Display". Select "Format". Select "SWR".
Now you can connect the antenna. The SWR graph of the antenna under test will display. It is measuring values of the antenna using that specific length and type of coax. How did you do? Need to see or do more? In a future article there will be more information.
Ralph WD0EJA
July 2021
Bilal Company
137 Manchester Dr.
Florissant, Co. 80816 U.S.A
Ph: 719/687-0650
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