Vhf Whip
What is "Antenna dimension D" Fraunhofer equation describes distance?
Radio Commuications learning, distance from Fraunhofer where d = 2 * D ^ 2/Lamda require large "dimenssion D" of the antenna, as in the diameter of the antenna? For example, if I have a VHF transmitting antenna at 175MHz (wavelength 1.7 million), and is a kind of whip antenna with a diameter of, say, 10 cm (0.1 m), the far field is at a distance of more 2 * d ^ 2/lamda = 2 * (a ^ 2) / 1.7 = 0.00177M? Thanks to look at the antenna and the correction of what is "the size of the antenna" is defined, then it is two in one dimension 1/2lamda antenna (1.7 / 0.85 =), so d = 2 *. 85 ^ 2/1.7 = 0.85 m?
D is the largest physical dimension of the antenna linear. A quarter of a wave with a suitable base is generally regarded as the equivalent of half a wave, I expect to be 1.7 million.
FT-817ND RX Contest delle Sezioni VHF
|
|
Shakespeare VHF 15″ 5216 SS Black Whip Mast Antenna $39.99 |
|
|
Shakespeare 5241-R 3′ VHF SS Whip Marine Antenna $57.95 |
|
|
New QTR Wave VHF Motorola NMO Whip Antenna Antenex NIB $16.00 |
|
|
Motorola 144-152 Mhz VHF 1/4 wave Antenna Whip Only $3.11 |
|
|
Motorola 152-162 Mhz VHF 1/4 wave Antenna Whip Only $3.11 |
|
|
VHF Whip Antenna Motorola Radio HT1000 XTS2500 MTX8000 $5.99 |
|
|
WHIP VHF 14CM antenna for GP-2000 GP-68 GP-328plus $10.00 |
|
|
WHIP VHF 15CM antenna for GP-88 GP-300 GP-308 GP-68 $10.00 |
|
|
Motorola OEM Whip Antenna 155-174MHz VHF 8504762J02 NEW $6.50 |
|
|
Motorola OEM Whip Antenna 155-174MHz VHF 8504762J02 NEW $6.50 |
|
|
Hand-Held VHF Flexable Whip Antenna 134-174MHz BNC $18.33 |
|
|
Mobile VHF/UHF Whip + L-Bracket Mounting Kit PL-259 $33.95 |
|
|
Mobile VHF/UHF Whip Antenna 132-960MHz NMO $18.33 |
|
|
5-046 WHIP VHF antenna for GP-328GP-2000 GP-68 $9.00 |
|
|
Shakespeare VHF 15in 5216 SS Black Whip Antenna – Brack $31.99 |
|
|
Shakespeare 5218 VHF Magnetic Mount Antenna $37.02 SHAKESPEARE VHF 19″ 5218 BLACK SS WHIP MAGNETIC MOUNT… |
|
|
Ramsey WA10 Telescopic Whip Antenna VHF – UHF $14.95 Ideal for handheld portables, receivers, and communications test equipment. Professional chrome finish with integral swivel mounted BNC connector for virtually any application! From the top of equipment to 90 degrees on the back of equipment, it will work like a champ! Whip extends 5.25 to 27.75 to cover a wide variety of ranges with ease!… |
|
|
Shakespeare Low-Profile VHF Marine Band Antennas SHA-5240 Standard SS Whip Shakespeare low-profile VHF marine band antennas are perfect choice for bassboats, center consoles, or any vessel where compact size is important. Choose from models 5240 (standard Shakespeare low profile antenna) and 5241R (heavy duty version)…. |
|
|
Compact anechoic chambers for testing and alignment of VHF whip antennas … |
|
|
5215 3′ Stainless Steel Whip Antenna $33.76 Shakespeare Style 5215 SQUATTY BODY® VHF Marine36″ LENGTH, 3dBEND-FED 1/2-WAVE STAINLESS STEEL WHIPA favorite with Sailboat owners, this lightweight, low profile, stainless steel antenna is specially designed for masthead mounting.Hermetically sealed, tin-plated copper wire coilStainless steel body and whipSO-239 connector – cable sold separatelyMount: Stainless steel “L” bracket supplied, for m… |