CSvax:svb@pur-ee.UUCP (08/12/83)
Having only limited space and money available I thought about putting up a (80)-40-20-15-10 vertical. Does anybody have experience with such a set up? Please drop me a note. Then I can ask more detailled questions. Stephan v. Bechtolsheim, KX 9 G, DF 4 CK Purdue CS
rjr@mgweed.UUCP (Bob Roehrig) (06/17/85)
THe last Field Day that I participated in where I was responsible for setting up the 75/160 meter station, I decided to use a vertical. I used a center loaded pipe about 35 to 40 feet high. The antenna was tuned slightly too low in frequency for 75 so I compensated for that with a series cap at the base. On 160, I added additional coil to lower the frequency. The ground system consisted of eight quarter- wave radials on 75 meters. The system worked really great on both bands, in fact better than expected. On 160, we worked all stations we could hear on that band in 30 minutes (there were only about 25 stations on). By the way, the base impedance, as expected, was less than 50 ohms so a toroidal autotransformer was used to match it to the coax. No tuner was used on the 820 transciever. The radials were insulated stranded wire, about 18 Ga. Bob K9EUI