Re: [IRCA] Local ham beacons on LW

["Steve" <VE7SL@xxxxxxx>]

> I wonder what kind of antennas they're using. A quarter wavelength on 470 
> kHz (my wavelength conversion spreadsheet is in MHz and won't do three 
> decimal places) is 523.23 feet.



Dennis - we both use inverted L's with a small ground radial system. The 
antenna is brought to resonance with a large loading coil at the base and 
then impedance matched to 50 ohms and then back to the transmitter. At this 
frequency backyard-sized antennas are very inefficient but thanks to RF 
loving to radiate, it is surprising what can be achieved with a even a small 
installation.

Steve / 73


WEB - "The VE7SL Radio Notebook":  http://members.shaw.ca/ve7sl

VE7SL BLOG - "Homebrewing and Operating Adventures From 2200m to Nanowaves": 
http://ve7sl.blogspot.ca/ 

_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx