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WA0CBW

Joined: Sat, Apr 4th 1998, 00:00 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Antenna Modeling for Beginners Feb 8th 2013, 18:19 3 2,770 on 14/2/13
Roller Inductor Tuner Dec 20th 2011, 19:26 1 2,713 on 20/12/11
Using Ladder Line Jul 27th 2011, 19:43 3 4,116 on 29/7/11

Latest Posts

Topic Author Posted On
"wacky"? SWR readings on tuning antennae.. Help?? KM6SQB 2 weeks, 1 day ago
I have found that if you are using a metal mast it needs to be insulated from the dipole mount. I have used a 3 foot piece of fiberglas or plastic pipe. Also make sure the whip isn't inserted so far it engages the top coil of the mast.
Bill
adjusting SWR and hamsticks - help?? KM6SQB on 5/11/18
In most cases the resonant frequency will have the lowest SWR. Also you must re-calibrate the SWR meter for each change in power. SWR is the ratio of forward voltage (or power) to reflected voltage (or power). If you are measuring at the transmitter end of the coax use a piece of coax that is 1/2 wave length long at the frequency you are measuring. Don't forget to account for the coax loss in your calculations.
Bill
Grounding station vs Vertical Antenna and tower VE3SR on 29/10/18
Normally ground rods are spaced twice their length apart. 8-foot ground rods would be placed 16 feet apart for maximum effectiveness. The NEC also requires all external ground rods be connected to the building main electrical ground.
Bill
License Hard Copy? WN5FDS on 29/10/18
You can go to the FCC web site and down load a PDF of your license that you can print.
Power loss from TX INSIDE a ROOM? K6PAA on 18/10/18
There are web sites that can give you the approximate RF attenuation for various building materials and construction techniques.
Bill

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