Home |
Search |
Today's Posts |
|
#1
|
|||
|
|||
Mike,
Due to limited space in the roof - I'm renting so won't risk an external antenna - my setup is similar to this. I use an OCF dipole (some call it a Windom but this is incorrect) with a 300 ohm feedline running to a wallplate in the loungeroom. From there it goes to a 4:1 TV-style balun and into 75 ohm coax. Works quite well. The dipole is in parallel with an existing VHF TV antenna, so it should do well at 20 meters too when I finally decide to play up there. Not sure about your earthing situation, mine didn't need it. The setup looks like this. I'm in Australia if you're worried about the weird orientation: ^ \ North __________________( )_____________ | 10M H 5M | | H | | 4M H 3M | | H | | H H El-Cheapo H 4:1 Balun H 300 ohm {X}=========== ribbon feedline | | 75 ohm | Coax | [SDR-1000] Rob mike wrote: Given I am currently using 75 ohm coax to feed my random wire, I believe I could use a 300 ohm to 75 ohm (4:1) TV twin lead to coax converter and get away with it. Please correct me if I am wrong, but I think I would attach the random wire to one terminal of the 300 ohm input. The other would go directly to earth ground, or via a gas arc tube to ground. On the other side, I would attach my coax cable. To give the coax feeder a ground at the antenna end, I would to open up the converter and solder in a ground wire on the coax sheild terminal. This would kill off common mode currents. This would give my antenna feeder system a matching transformer plus give the antenna a direct path to ground. Theoretically, I am I missing anything? mike |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Long wire antenna | Antenna | |||
Long wire at 6m? | Antenna | |||
Excessive RF Exposure from Long Wire? | Antenna | |||
Any Good Or Useful For Listening Only ?: WiNRADiO WR-LWA-0130 Long Wire Antenna Adapter | Antenna | |||
Opinions please G5 against long wire against windom? | Antenna |