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Categories | Antenna Analyzers | VK5JST Aerial Analyzer Help

Show all reviews of the VK5JST Aerial Analyzer

You can write your own review of the VK5JST Aerial Analyzer.

PE7GL  Rating: 4/5 Mar 16, 2013 04:21  Send this review to a friend!
Experiment and improvements  Time owned: 0 to 3 months
After building these kit I saw that the out put of HF power amplifier was not constant so after measuring I found that Q10 was the reason of this problem.
I have remove Q10 and placed a jumper between emitter and collector pads.
After the modification the output is now far better and constant.
The analyzer is now good running at 8Volt supply voltage.
I has also replace the 7805KC by a 78L05 voltage regulator.
The supply current decreases from 70 mA to 30 mA. So we have a longer battery live.
For batteries I use now 8 NIH cells and de analyzer can run 30 Hours at one charge loading.
Gerard PE7GL  
Product is in production.
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