slow-z wrote: Been off the bands about 15yrs, and want to get back on! have forgotten much. Can i feed a long wire antenna with a tuner that only has a unbalanced output. For transmitting purposes you will need to provide a good RF ground at your tuner. This can be ground radials, good, or a ground rod, not so good. The ground makes up the other (necessary half) of your long wire antenna. A 1/4 wave counterpoise wire at the operating frequency will provide a good? RF ground. The unbalanced tuner should have the "long wire" connected to the "hot" or rf output of the tuner, and the ground or common connected to the RF ground. Gary N4AST |
In article . net,
chuck wrote: Yes, but if the long wire is on the order of a half-wavelength, the ground becomes a lot less critical. It becomes less critical in terms of the need to provide the "other half" of the radiator. However, if the long wire is roughly a half-wavelength long, its feedpoint impedance is going to be rather high... possibly higher than you can match with a typical "unbalanced" tuner intended for matching coax-fed antennas. And, if you do match it, you'll find a relatively high RF voltage present on the portion of the wire inside the shack. This can lead to "RF in the shack" problems, and you may need a really good RF ground for the tuner and rig just to keep RF voltages on the equipment chassis from being a problem. -- Dave Platt AE6EO Hosting the Jade Warrior home page: http://www.radagast.org/jade-warrior I do _not_ wish to receive unsolicited commercial email, and I will boycott any company which has the gall to send me such ads! |
Nah, RF is good for burning off warts and such ;)
Scott N0EDV Dave Platt wrote: This can lead to "RF in the shack" problems, and you may need a really good RF ground for the tuner and rig just to keep RF voltages on the equipment chassis from being a problem. |
antenna
Been off the bands about 15yrs, and want to get back on! have forgotten
much. Can i feed a long wire antenna with a tuner that only has a unbalanced output. |
I have a remote tuner in my garage, about 100 feet from my shack. The
fluorescent lights flicker in the garage when I transmit with the amplifier on. I suspect this means there are high voltages in the garage. It still works. I us the metal interior of the garage for a ground. The steel sheets that form the interior of the garage are wired together. Michael W0EZI "Scott" wrote in message ... Nah, RF is good for burning off warts and such ;) Scott N0EDV Dave Platt wrote: This can lead to "RF in the shack" problems, and you may need a really good RF ground for the tuner and rig just to keep RF voltages on the equipment chassis from being a problem. |
All times are GMT +1. The time now is 01:03 AM. |
Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
RadioBanter.com