antenna - One dipole for multiple bands? - Amateur Radio Stack …
I have found a dipole antenna with 15m aprox in each side, so, 60m band antenna. It feels weird to have an antenna for that band and not for 20 o 40 or 80. My questions is: Can I use this …
antenna - Using a balun with a resonant dipole - Amateur Radio …
The shield intercepts any EM fields, effectively hiding the center conductor from any external fields. You don't have a symmetrical arrangement anymore: one leg of the dipole is connected …
Grounding a dipole - Amateur Radio Stack Exchange
2017年3月31日 · You should ground the shield of the coax before or at the connection point to the balun, not between the balun and antenna. Remember that the balun conversion between the …
Good wire for wire antenna? - Amateur Radio Stack Exchange
III. Amateur Transmitting and Receiving Stations — Antenna Systems. 810.52 Size of Antenna. Antenna conductors for transmitting and receiving stations shall be of a size not less than …
antenna - Why does SWR of a dipole decrease the closer it is to …
2023年2月13日 · Just keep in mind, that as long as a center-fed 1/2λ dipole, or 1/4λ antenna with a 1/4λ counterpoise (like a ground-plane antenna, or a 2 element so-called "dipole" that …
DIY HOMEMADE DUAL BAND VHF & UHF (2 Meter & 70 …
2023年3月19日 · The credit for these two versions of the same basic vertically polarized dipole antenna goes to Dave, KG0ZZ for the first video and Paul Faulkie (Faulkner), M0PCF for the …
What is the maximum and minimum of antenna gap of dipole …
2019年8月3日 · The mathematically ideal gap is 0, as explained in several books on antenna theory; there is an integral over the dipole length as charge is collected. Any gap between 0 …
What is a Gamma match in the context of the driven element of a …
In fact, if you move the shorting strap all the way to the end of the antenna, it's exactly a folded dipole. Typically, the gamma match is constructed to give an even more than 4:1 impedance …
dipole - Calculating bandwidth of antenna? - Amateur Radio Stack …
The antenna being modeled is a center fed dipole, 10-meters total length, with #12 copper wire. The only difference between the previous answer and mine is that Phil Frost used 3 mm for …
antenna - How to estimate a dipole feedpoint impedance?
The real antenna will differ quite a bit from the model because of unknown ground properties, various metal object near antenna, etc. This method may still be useful, e.g. if the antenna is …