Put a 50 ohm resistor across the input and measure the output impedance, OR, put an Antenna Analyzer on the input and try various fixed (non-inductive) resistors across the antenna side until you fin
IMHO, 80 to 100 ft works very well on 20, 30, and 40M AFTER DARK. IMHO, 80 to 100 ft SUCKS on 10, 12, 15, 17, 20M when the SUN is UP. 110 to 120 ft places the second High Band lobe at useful (higher)
We use 20 ft. fence rails stuck inside shorter 2 inch o.d. masts to support our 80M inverted vees above 2L Quads at our FD site. Works like a champ. Tom N4KG _________________________________________
Simple solution from ANY place in the world: Get a Globe. Mark the location of the Magnetic North Pole. OBSERVE the angle from your QTH to the rotational (True) North Pole and the Magnetic North Pole
For starters, look at the antenna patterns for a G5RV and 80 Meter Dipole when used on higher bands in any ARRL Antenna Book or Handbook. I use a 20M dipole fed with ladderline which has a figure 80
IF you go to 'fix' the fence, be careful. I have seen two types of chargers. The ones for pets are a few hundred volts and ordinary 600V rubber gloves should be OK. I had a dog that would just walk t
On my 130 ft high 80M dipole, I use a short center insulator. To connect the ladderline, I cut out one of the center blocks, leaving the insulation on the wire, run the wires through the holes in the
I *believe* the brake wedges in the HAM-M are 'rounded', sort of like a bunch of 'speed bumps' around the base of the rotor on the inside. The brake wedge fits between those bumps. If you have a high
One more note about the AR-22. As I recall from decades ago, it only has 4 (yes, FOUR) ball bearings per race, held on place by a plastic ring of some sort. Definitely LIGHT DUTY ! Tom N4KG _________
As I have suggested many times before, it helps to provide a COMPLETE and ACCURATE DESCRIPTION of the problem when asking for advice. How much SPACE do you have for a tower? What do you want to put O
When asking for advice it helps to provide a COMPLETE and ACCURATE DESCRIPTION of the problem. How much SPACE do you have? What SUPPORTS do you have? Yes, a Double Extended Zepp does have gain. That
Sounds like a tough one. For starters, connect a wattmeter and dummy load to one antenna, then transmit at maximum power into the other one, rotating the beam for maximum power transfer. Then you wil
Sounds like a tough one. For starters, connect a wattmeter and dummy load to one antenna, then transmit at maximum power into the other one, rotating the beam for maximum power transfer. Then you wil
Why only 2 (slightly elevated) radials? I have 10 radials at 15 ft on my Reverse Fed Elevated GP which seems to play quite well. I also have a wire vertical in the woods using a half-Bow Tie radiator
Contrary to seemingly popular opinion, the HAM-M *DOES* have a brake. The biggest difference is that the Ham IV has a steel ring gear vs. the 'potmetal' gear (whatever popmetal is) in the Ham-M. I ha
It seems like a vertical dipole or vertically polarized 1WL Loop would also be a simple antenna to implement, especially a diamond configured loop. Opposing 2 or more element loops could share a comm
The TA-40KR add on kit consists of two 20M traps and aluminum extentions. The extensions are tuned to the desired lowest frequency of operation. I 'assume' they could be set 'between' the CW and SSB
The TA-40KR add on kit consists of two 20M traps and aluminum extentions. The extensions are tuned to the desired lowest frequency of operation. I 'assume' they could be set 'between' the CW and SSB
The TA33 traps are for 10 and 15 Meters, NOT 20M. 20M uses the full TA33 element out to the tips. I see NO reason one could not set the 40M extension between the CW and SSB settings. Cushcraft has 3
A simple way to match 100 ohm antennas such as full wave loops or resonant long wires fed at a current maximum is to use a 1/4 WL 75 ohm coaxial transformer. The formula for 1/4 WL matching sections