coax cable length
18 links
Antennas : 20M : 20 meter Vertical Antennas
- Vertical antenna for 20-15-10 m
- This is a vertical multiband antenna made up of several aerial elements lambda/4 length, feeded with just a coaxial cable in French.
[ Hits: 23550 | Votes: 20 | Rating: 5.2 ]
- Squarooka Antenna - squared bazooka for 2 meters band
- Sort of similar to the one of the 6m omni. Instead of using twin-lead, this design makes use of a more or less regular double bazooka antenna (coaxial dipole). Your attention shall be drawn to the available standart literature, such as Rothammel.
In order to "compute" the dimension, Karl Rothammel mentioned that the total length of the dipole shall be 95% of the free-space wavelength. The short-circuit bridges (closing the folded dipole) are to be placed at a distance-fraction being equal to the velocity factor of the coax cable used, which will be 66% using RG-58 or RG174.
[ Hits: 353 | Votes: 0 | Rating: 0 ]
- 40m loaded dipole
- This is an short dipole for 7 MHz. Total length of this dipole is just 10 meters, 33 feet. Missing lenght is balanced by a coil made of 49 turns of a 40mm diameter pvc pipe. The use of a choke balun is recommended, as always, to adapt the unbalanced coax cable to the balanced antenna, and to prevent RF feed back along the coax shield.
[ Hits: 192 | Votes: 4 | Rating: 8.75 ]
- Bazooka dipole for 70 cm band
- Here is a very simple 70cms dipole from Harald PD2HFE, which uses a single piece of
RG-213 coaxial cable 34 cms in length.
[ Hits: 16548 | Votes: 30 | Rating: 6.67 ]
- Corned Fed Delta Loop
- Author found a ratio between the lengths of the sides of the Delta Loop that give reasonably low SWR into a 50 ohm coaxial cable almost independent of the high above ground and other surroundings. This ratio also gives good results no matter orientation. Includes an online delta loop antenna calculator.
[ Hits: 167 | Votes: 0 | Rating: 0 ]
- A 1:1 Coaxial Balun
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- PDF article about a coaxial 1:1 balun, original concept by I4BBE using a quarter-wavelength and the three-quarter-wave adapting sections with the 50-Ohm coaxial cable by I0QM
[ Hits: 44462 | Votes: 30 | Rating: 7.22 ]
- A Cost Effective Current-mode 1:1 Balun
- A cost effective current-mode 1:1 balun can be constructed from a length of coax and a rod typically used for a broadcast antenna loop-stick, some electrical tape, cable ties, a length of PVC water-pipe and some connectors.
[ Hits: 9191 | Votes: 4 | Rating: 7.25 ]
- The Guanella 1:4 balun
- A cost effective current-mode 1:4 balun can be constructed from two lengths of coax, two ferrite rods, some electrical tape, cable ties, a length of PVC water-pipe and some connectors. This form of 1:4 current-mode balun is named after G. Guanella.
[ Hits: 3636 | Votes: 1 | Rating: 10 ]
- Coax Dipole Calculator
- An efficient program to calculate dimensions of coax dipoles, or bazooka antennas considering velocity length of different coax cables. Express dimensions in feet/inch and meters/cm. Freeware by VE3SQB
[ Hits: 17568 | Votes: 74 | Rating: 5.31 ]
- Coaxial antennas
- G3TXQ study on coaxial cable demonstrate that it can reduce an element's length by something approaching the Velocity Factor of the cable
[ Hits: 1290 | Votes: 1 | Rating: 10 ]
- Magnetic Loop HF antenna
- An homebrew HF Magnetic loop made with 2m length of 6mm diameter copper pipe formed into a near circle as the low loss inductor, a short length of coax as a capacitor,a short length of mains cable, again as a fixed tuned capacitor, a tunable 365pF air spaced capacitor, and a small Jackson C804 airspaced variable with a small 3-35pF trimmer in parallel
[ Hits: 130 | Votes: 0 | Rating: 0 ]
- Archimedean Spiral Antenna for RTLSDR
- Dodgy plans to make Archimedean spiral antenna for RTLSDR software defined radio receiver. Made of two equal lengths of coaxial cable seems to be the easiest circularly polarized antenna to make that will cover a broad range of the rtlsdr dongles E4000 tuners
[ Hits: 1031 | Votes: 2 | Rating: 10 ]
- Quarter Waves and Velocity Factor
- Coax Velocity Factor in Baluns, Does it Matter?
Test results show coaxial cable velocity factor does not always enter into stub length calculations especially in the world of Baluns
[ Hits: 208 | Votes: 0 | Rating: 0 ]
- Matching with one-twelfth-wavelength feed line
- Matching with a half wave or wuarter wave coaxial cable is pretty well known, but an existing 1961 system to do that with two one-twelfth-wavelength transmission lines.
[ Hits: 540 | Votes: 1 | Rating: 10 ]
- Bootstrap coax traps for antennas
- Analysis of an antenna trap where a coil is formed of a length of coax cable, the outer conductor of one coax end is tied to the inner conductor of the other coax end, and the remaining connections form the terminals for the trap.
[ Hits: 1356 | Votes: 2 | Rating: 9 ]
- Coaxial Cable & Power Handling
- This calculator can be used to estimate the attenuation (dB loss), power handling capability, and transmission efficiency for some of the more popular Wireless Communications and MIL Spec cables at the frequency of interest
[ Hits: 1181 | Votes: 8 | Rating: 8.17 ]
- Measure Impedence of Coax Cables
- This video shows one way to use a scope and function generator to measure the length of a piece of coax transmission line as well as estimate its impedance
[ Hits: 1091 | Votes: 3 | Rating: 6.67 ]
- miniVNA PRO Modifications
- The mini Radio Solutions miniVNA PRO is the only affordable vector network analyser (VNA) I know of that offers remote wireless operation.
This is very interesting because it allows to measure the input impedance of HF antennas installed at height without having to deal with coax cable lengths, baluns nor common mode suppression chokes.
However, to render the miniVNA PRO truly field proof, it requires a number of significant modifications.
[ Hits: 136 | Votes: 5 | Rating: 7.8 ]
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