Antennas By N6LF

LF-MF antenna notes

 

The present draft of these notes, while far from perfect, may be helpful to many amateurs.  For that reason I've posted them in their present form with the understanding they will be revised, probably several times, in the coming years. 

By all means let me know if I've forgotten something useful and, even more importantly, if I've made a mistake!  A lot of other peoples work has been included but the mistakes are all mine!

GL and 73, Rudy N6LF, WD2XSH/20

LF-MF notes: 

Download Preface-Table of contents

Download Appendix 4- ground systems as reflectors

Download Chapter 1

Download Chapter 2

Download Chapter 3

Download Chapter 4

Download Chapter 5

Download Chapter 6

 

630m Antenna Support Poles at N6LF

I have recently moved to a new QTH with several acres of clear farmland but no trees for antenna supports.  So I had to come up with a means to support a large 630m umbrella vertical and other experiments with wire antennas.  Here's what I did: Download Saginaw antenna support poles . 

A large ID clamp-on RF current transformer

Earlier this year I posted a description of a simple clamp-on RF current transformer.  Since that time I have updated the design with a much larger ID and the core held in a spring-clamp that allows easy on/off in the field.  The following is an update of the earlier post: Download Current transformer 2 .  File size = 460 kB.

Tower resonance measurements

I mentioned on the towertalk reflector that I had been trying to make accurate measurements of resonance in grounded towers with large antennas systems on them.  A number of people asked for the details.  So here they are: Download Some notes on measuring tower resonances .  These are only preliminary notes which give the general idea of what I'm about.  In due course they will be updated.

73, Rudy N6LF