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Novemeber 2017 - Antenna Analyzer

Oct 24th, 18:00

rrmccabe

Joined: Apr 20th 2011, 19:52
Total Topics: 0
Total Posts: 0
Anyone in the process of building this kit?

I ordered the board from QRP guys and parts on a slow boat from China via Ebay.

Have to say the assembly manual is going to be the biggest challenge as its missing info, has incorrect values in the schematic (which they warn you) and assembly photos using boards from other kits that look close but are not.

In the end I will probably end up with more money in it than its worth but looked like a fun project.
Nov 18th, 12:19

WA7SDI

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I have just completed the Arduino Antenna Analyzer in November 2017 QST! It is an amazing little piece of equipment!! works great!
There are a few problems, yes!!! but easy to overcome! I am not a computer guy and in this area is where I had the most problems but managed to muddle through. This is (not a beginners project)! but easy enough with a little experience and patience. I had a few questions for Jack but did not get a reply thru e-mail, I am sure he must be a busy man. all that being said! This is a worthwhile project and I would like to see more projects like this in QST!
Please remember Jack and Farrukh put in a lot of time on this and gave it to us all for FREE!!
Happy building and 73 Paul WA7SDI.
.
Dec 7th, 09:21

rrmccabe

Joined: Apr 20th 2011, 19:52
Total Topics: 0
Total Posts: 0
Hey Paul, thanks for the reply. I am at the same point with Jack and no replies.

My analyzer seems to function but does not display SWR correctly. On a dummy load it reads well but on a real antenna with 1.5:1 SWR it is off the charts. Have yet to figure it out.

I appreciate the efforts for the project but think the league should have vetted the project better before publishing it.
Dec 7th, 20:03

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
SWR analyzers have issues when there are nearby transmitters present--the simple diode detectors can't tell the difference between the reflected signal and a strong radio signal picked up by the antenna. One way to see how bad things are is to connect a 50 ohm load and a diode detector directly to the antenna.

Zack Lau W1VT
ARRL Senior Lab Engineer
Dec 8th, 16:25

rrmccabe

Joined: Apr 20th 2011, 19:52
Total Topics: 0
Total Posts: 0
That is not the case with this one. Connecting a 270 non inductive resistor to it should give me approx a 5:1 SWR but shows 300:1. 50 ohm resistor looks good. Something obviously is wrong.
Dec 9th, 08:56

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
https://www.youtube.com/watch?v=LUbt3W4hnTE
KE4EST has a video of his version of this project. He says he has compared it against an SWR meter.

https://groups.yahoo.com/neo/groups/SoftwareControlledHamRadio/info
Not only is there discussion about this project on this Yahoo forum, but Jack, one of the project designers, can be reached here.

Zack W1VT
ARRL Senior Lab Engineer
Dec 10th, 09:20

rrmccabe

Joined: Apr 20th 2011, 19:52
Total Topics: 0
Total Posts: 0
Thanks. Jack did respond to my email but no resolutions as of yet.

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