fredag 4. desember 2015

Troubleshooting my 20-40 meter trap antenna..

I have borrowed a image from ON7EQ - Holiday trap antenna..

http://www.qsl.net/on7eq/projects/holidayant.htm


I'm using a 100pF capacitor and a inductor at about 1.02uH



At 14.061MHz the SWR is 10.62

Inductor 1 is 1.016uH and the other is 1.021uH

It resonates arount 8.1MHz but not at all around 14MHz..
Strange..
Is it the wire, or is it the inductor...

--------

I have adjusted the inductor..

We'll see what the difference it's going to make.
exciting... :-)

This is with 0.22mm² wire
1.94SWR at 8.251MHz and 2.61SWR at 26.451MHz
There is also a dip with 6.7SWR at 14.201MHz

This is with military grade wire
1.45SWR at 7.001MHz and 2.69SWR at 23.201MHz
Dips also with 6.99SWR at 13.401MHz



TBContinued.. 


I found this... good shit:



Continued...
I replaced the 100pF capacitors with premium grade silver mica capacitors.
I also took one turn of the Inductor. Ended up with 12T and 100pF.

That was it!
Works!

Building the antenna now... 



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