The Jeronimus.Net blog
This is a 2 meter antenna i have temporary mounted outside for testing purposes. It is connected to long thin coax cable. With the coax-cable i can reach the vna connected to my computer. So i included it in the series of quick antenna tests.
See below the result:
Also from AliExpress i got this RH770 Antenna
The length is adjustable so it is possible to do some tuning.
I did test it on full length.
I also have 2 Abree AR771 Antenna's from AliExpress
They both look the same. See picture above. (Perhaps it are fake clones). Below the results of these two antenna's.
Below the results of the measurement of another Antenna.
I did buy this antenna some time ago on AliExpress.
When testing the gate fence antenna (see a previous post) i also wanted to compare the measured result with some other antenna's. This is the result of a quick measurement of an antenna that came with of one of my Quansheng 2m/70cm radio's.
Testing a gate fence antenna with a vector network analyzer. This is a picture of the antenna of the original receiver for the fence controller after some cleaning. ( See previous blogpost)
As i have a vector network analyzer (vna) i wanted to test the antenna to check on what frequencies it can be (re)used. I soldered an sma connector to the coax wire, calibrated the vna and did a quick scan over a relative broad range.
See below the results displaying Smith chart, Quality factor and swr (VSWR). The lower the swr the better. The minima in the swr curve give an indication of optimal frequencies.
I also did the same quick scan on some other antenna's and post the blog reports with the results. Therefore this blogpost is in fact part of two different series of blog posts.
-1- Dismantling the electronics of a gate fence. ( #GateFence )
-2- Some antenna's quick tested ( with a vector network analyzer (vna) ).
