The offset shape provides excellent support for the wrist, the soft grip is comfortable for the hands and the strap is super convenient. Basically, a totally new yagi dimensional design.As with any mobility device please see you doctor before sizing and use. Generally, larger diameter rods in a yagi requires the rods to be shortened and brought closer together because inter-element coupling is reduced by the lower impedance, larger diameter rods. Generally, a yagi drives the input impedance down significantly for driven element but this depends on reflector and director(s) spacing from driven element. If you are putting this in a yagi array, things change significantly. Lastly the bandwidth of the dipole will widen out, again likely an advantage. This may actual be an advantage if you are feeding with a 50 ohm coax.

If just a dipole arrangement you will move from about 70 ohms for thin rods to about 50 ohm. Second, it will drive down the impedance at the feed point. You will likely need to shorten them to about 0.80 to 0.85 of the normal half wavelength, rod end tip to end tip. This has three dominant effects.įirst, it will require shortened rods. If you think of the integral segment by segment coupling between the two dipole rods, larger diameter reduces the outwardly series inductance and increases the rod to rod coupling capacitance. On this band the repeater TX and RX frequencies have a 20 MHz split, its virtually impossible to get an antenna to have flat SWR across 20MHz on that band Generally we will peak the atenna across maybe the 4 - 10 MHz where most of the transmissions are done and if the SWR is a littlebit higher in the receive sections its not really an issue. Thats a bit more difficult on our 23cm band, 1250 to 1300 MHz, covering 50MHz is nigh impossible and keeping the SWR low. the 2 metre ham band 144 to 148 MHz ( 4 MHz bandwidth) or the 432 to 450 MHz band (8 MHz bandwidth) I can produce an antenna that the SWR doesnt go above 1.5:1 across the whole band Some antennas I build I purposely make large diameter elements, cuz i want good tuning bandwidth across a wide bandwidth without the need for retuning eg. I have to agree with him, just use it you are not going to see any other detrimental effects. That article that Sceadwian linked to is just what you need to read over and over and come to understand

The larger diameter will give better bandwidth as the others have already indicated. It really isnt that critical, its not going to make any operation difference, to if the elements are 1cm or 5cm in diameter.

Active dipole antenna op amp