Hello to all, How is the rating of a relay converted to RF usage? A company normally gives the voltage and current rating for the relay contacts: 250 v ac @ 2 amps (assumed at 60 CPS) 30 v dc @ 3 amp
Hello to all, Thanks to all that replied to my request. Based on the information I have received : VOLTAGE = SQUARE ROOT (POWER x RESISTANCE) CURRENT= SQUARE ROOT (POWER / RESISTANCE) With a 50 OHM L
I just received my copy of Worldradio September 2003. There is an article by Kurt N. Sterba on page 34, Aerials SWR and Voltage. Second paragraph "voltage goes up as the square root of the VSWR. So,
Hello to all, In the ARRL antenna handbook they show where you can use two coax lines as a balanced line. Only the center conductors of the Coax are used. The article covers the new impedance of the
Balanced Line using Coax Results I have summarized the many replies received to my question. A very grateful thank you to everyone that replied. Rich AA2MF W4DG I noticed a LARGE difference in the no
Michael, I asked the same question some time ago. The answer I received was. Subtract one square foot for each foot above the top of the tower. So in the case of 10 Square feet at 50 Mph. 10 feet abo
Paul, I don't think you will see much of a difference between the antennas you mentioned. You may want to consider using a second antenna for receive only. In the ARRL Antenna Handbooks you will find
Randy, Try this web site. http://n5xu.ae.utexas.edu/rfsafety/ Rich AA2MF Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
Hello to All, The question of a full size 1/4 wave vertical element has been bouncing around for some time now. Many years ago I recall seeing at a Radio Contest Club Meeting photos of a Four Square
Mast Length to Wind Loading Questions. Hello to all, Is there a rule of thumb to follow? Tower rated: 15 Square feet 1 foot above tower top. Moving the antenna to 15 feet above tower top. How large i
Hello to all, A very hardy thanks to all that replied to my question. I have summarized some of the messages and included below. I hope this information will be as useful to others as is has been to
Tom, I am not shore if I understand your comments. If a tower has been rated for a load at its top and this is known. Then to move the load, why would the description of the tower be needed? In case
Hello to all, I am working with the EZNEC program to find the radiation patterns of some tri-band beam antennas. This work is for my Florida QTH antenna stack. I am looking for someone willing to pho
Hello to all, As a side note to the aluminum tubing request. Are there any plans available for a free standing vertical element around 70 feet or so. With out guys and strong enough to handle a 120 m
Hello to all, To continue my information gathering for the new station in Florida. Nothing lasts forever. Are there any Quad mechanical design's that have proven themselves with the test of time. Wha
Tony, I have burnt the enamel coating off my placing the end of the wire in the flame of a match. Once the enamel starts to burn remove the wire from the match flame. As soon as the length along the
Dink, Why bother putting up two antennas? Put up the full size 1/4 wave vertical for 80 meters. Then use it as a base feed 1/2 wave vertical for 40 meters. Rich AA2MF http://www.mscomputer.com additi
Hello to all and Hello to Dink, How this all started: A few days ago Dink, N7WA requested information on the possible interaction of closely spaced full size 1/4 wave verticals for 80 and 40 meters.
Hello to all, Sometime back there was the discussion on the reflector of starting another group for "Hams With Small Lots". During this discussion I met a fellow Ham that had information on the true
George, The antenna should work very well in the direction away from your building. window ledge running at an angle to the ground away from your building. Remember the far end of the wire will be ho