Home |
Search |
Today's Posts |
#4
|
|||
|
|||
Interesting 144 foot Dipole
Cecil Moore wrote:
The following results are approximate but show the resonance trend on 80m Vs dipole length. Take a certain length dipole and adjust the length of the 450 ohm ladder-line for resonance on 7.15 MHz. i.e. NOTE: All of the following antenna systems are resonant on 7.15 MHz. and cover the entire 40m band with an SWR of 3.5:1 or less (good for built-in autotuners). Here are the approximate results: dipole length : feedline length : resonance on 80m 170' : ~85' : 3.62 MHz (3.52-3.72) 160' : ~87' : 3.7 MHz (3.6-3.8) 150' : ~89' : 3.8 MHz (3.7-3.9) 140' : ~91' : 3.92 MHz (3.82-4) 130' : ~92.8' : 4.06 MHz (resonant out of band) 120' : ~94.7' : 4.23 MHz (resonant out of band) Yesterday I had a 130' dipole that exhibited the above characteristics. I have changed it to a 144' dipole and now, with one length of ladder-line, the antenna covers all of 40m and 200 kHz of 80m using the limited range autotuner built into my IC-756PRO. A bonus is that the autotuner also tunes this fixed antenna system on 30m and 17m. Happy New Year, Cecil. Really neat design. Can you describe the balun you used? Thanks, Jim, AC6XG |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
End-fed dipole | Shortwave | |||
Shortwave Listener (SWL) Newbee Question - Is My Dipole Antenna Set-Up Right ? | Shortwave | |||
New LongWire Antenna - What Type Wire? | Shortwave | |||
Sources for Inexpensive RG-8?? | Antenna | |||
40 meter dipole or 88 feet doublet | Antenna |