Search
  • xtgaby

Magnetic loop 80 meter band.


Calculated coil value of the loop is 6.4 uH as explained in de 40 meter band loop.


Target frequency = 3.700 KHz


Calculated value for the capacity = 290 pF.


I have used in this case RG58 with a capacitance of 100 pF / meter.


As you can see on this picture.


I had to change the small loop to insert the signal an ad 0,25 meter with the existing 1.30 meter for best SWR figures. Small lop becomes 1.55 meter.




Marker 1 is SWR = 3 lower frequency,

Marker 2 is SWR =1,

Marker 3 is SWR = 3 higher frequency.

This means that we have an SWR =3 bandwith of 3.706 – 3.694 = 12 KHz.


SWR curve:

Return loss curve:


34 views
 

©2019 by Gaby's hobby site. Proudly created with Wix.com

This site was designed with the
.com
website builder. Create your website today.
Start Now