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The capacitor (also available from the same sources) should be 150-pF to 250pF maximum capacitance high-voltage variable So-called transmitting variables are usually ok if the plate spacing is at least 1 8 in Tuning of the longwire is simplicity itself If the tuner does not have a built-in VSWR meter, then install one in the line between the transmitter output and the tuner input Adjust both L1 and C1 (they are a bit interactive so do it several times) for the lowest VSWR If you use the alligator clip method, turn off the darn transmitter before adjusting the clip position RF burns are nasty!
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Ok, so we have decided to install a longwire How do we make it work First, make sure that it is long enough The bare minimum lengths for HF bands are 70 ft for 35 MHz and up, 34 ft for 7 MHz and up, and so on In general, the longer the better The second problem is a good ground The importance of a good ground cannot be underestimated, and it accounts for about 99 percent of the difference in reported performance of longwires A good ground consists of a short wire to either one very long ground rod or multiple ground rods spaced a couple feet apart An important factor is the length of the ground wire It must be considerably less than a quarter-wavelength Use no10 stranded wire (several parallel lengths) or braid When I was in college I lived on the second floor of a whacky student boarding house in Norfolk, VA The ground was 24 ft away, and that made short ground wire a joke and my longwire nearly inoperative But I figured out a way around the problem A quarter-wave radial was dropped out the window (see Fig 9-3) Use more than one radial if possible In one case, when the landlord was particularly cranky, I tacked the radial to the baseboard of my room (insulated on standoffs at the far end to protect against the high RF voltages present) It worked well!
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216 Longwire directional antennas A new product also comes to the rescue of those reader-hams who cannot put up a good longwire The MFJ Enterprises (Box 494, Mississippi State, MS, 39762, 1-800647-1800) model MFJ-931 artificial RF ground is installed in the ground line (see Fig 9-4) and is used to tune the ground wire Adjust the capacitance and inductance controls for maximum ground current as shown on the built-in meter Be sure to follow the instructions, however, because high RF voltages can appear on a nonresonant ground wire I wish I d had one of these when I was in that whacky boarding house; discussing existentialist poetry can t hold a candle to DXing
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When is a long wire a longwire
For many years, the longwire has been a popular form of antenna It is cheap, it is easy to construct, and although reports vary it has the potential to perform well Properly constructed, it has a lot of utility But what is a real longwire antenna In past columns, I have used the term to mean an antenna such as Fig 9-1 This form of antenna is popularly called a longwire if it is more than a quarter-wavelength I and other authors have used the term longwire to mean this antenna, but that s not rigorously correct A true longwire is an antenna that is many wavelengths long, or to be a little more rigorous, an antenna that is more than two wavelengths long Although I will still use the term longwire for both forms of longwire antenna, proper rigor requires Fig 9-1 to be called a random-length antenna
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