coax

359 links - and 3 categories

Build your own HF balun - A balun is a MUST for dipoles or similar antennas when they are feed with coaxial cable. From the RF point of view, the shield can be modeled as two conductors, the internal shield (the real shield, this is, ground) and the external shield, who is really far to be ground. In this way, your dipole has 3 arms, the two from the dipole and the coaxial cable shield (external face)
[ Hits: 248 | Votes: 1 | Rating: 10 ]

How to build a Coax Balun 1:4 and 1:1 - An air-wound balun made with coaxial cable can not become saturated because no powder iron or ferrite core is present. In this article author explains and compare coax baluns to ferrite baluns with comparison tables and detailed pictures
[ Hits: 577 | Votes: 8 | Rating: 8.63 ]

Reverse Engineering the Coax Dipole Antenna - Study of the Coaxial Dipole: Just how does this thing work.
[ Hits: 648 | Votes: 1 | Rating: 1 ]

Build your own RF-Choke - How to make an effective RF Choke. The coiled coax choke is the easiest to make but also the least effective. This article includes some general guidelines for winding coax chokes on a 10cm PVC pipe using RG-58 or RG-213 coax cable.
[ Hits: 791 | Votes: 12 | Rating: 7.33 ]

Tuning Antenna Traps - The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency. This article explains a method using a RF signal generator at +10dBm output into the coaxial trap.
[ Hits: 276 | Votes: 2 | Rating: 6.5 ]

Revisiting the GR5V and ZS6BKW Multi-band Antennas - NEC models are used to explore the GR5V and ZS8BKW optimizations. A third optimization is also rediscovered. The effect of fixed lengths of 75 ohm coax are explored. A link to the NEC model is provided.
[ Hits: 312 | Votes: 1 | Rating: 10 ]

SIVA Coax Cables - Cable manufacturer based in Italy, produces coax cables fo RF applications including 50 Ohm low loss cables for amateur radio applications.
[ Hits: 183 | Votes: 0 | Rating: 0 ]
Gigatronix Coax Cables - Manufacturers of Coaxial Connectors, Push-Pull Latching Connectors, Coaxial Cable, Multicore and Coaxial Cable Assemblies based in UK
[ Hits: 137 | Votes: 0 | Rating: 0 ]

Volda Communication - Volda is specialized in telecom tower antenna line accessories such as cable hangers, coaxial jumpers, grounding buss bar kits, pole clamps.
[ Hits: 64 | Votes: 0 | Rating: 0 ]

Notable Patents on Antenna Design - Patents of most popular antenna models including Zeppelin Antenna, Beverage Antenna , Franklin Antenna , Yagi-Uda Antenna , Sterba Antenna , Rhombic Antenna , Turnstile Antenna , Folded Dipole Antenna , Coaxial Antenna , Slot Antenna , Discone Antenna , Quad Antenna Element , Log Periodic Antenna , Swiss Quad Antenna
[ Hits: 287 | Votes: 0 | Rating: 0 ]

Hamtech - HAM-made engineering products supplies and produces coaxial relays, antenna switches, sequencers, roller inductors, variable capacitors, low noise preamplifiers, RF power rotary switches and coil bodies.
[ Hits: 192 | Votes: 0 | Rating: 0 ]

UKW-Berichte Telecommunications - On-line shop for coax cables, RF connectors, Lightning protectors, Create antenna rotators, antenna masts and mounts, amateur antennas by FlexaYagi, Tonna F9FT, ANjo-Antennen and M2 Antennas based in Eggolsheim Germany
[ Hits: 271 | Votes: 0 | Rating: 0 ]

Balun_cmr Calculate common-mode impedance - This EXCEL Program Worksheet calculates the common-mode impedance of a 1:1 Guanella (current) balun which is placed at the feed point of a balanced antenna system fed via coax.
[ Hits: 403 | Votes: 1 | Rating: 10 ]

Coax Loss Calculator Online by K5VR - RF Feedline (Coax and Ladder-Line) Loss and ERP Calculators made with Javascript. This complex feddline loss calculator has already several line types paramenters for most common coaxial cables from Belden, Time LMR, Wireman and other common products. Result will give Matches loss, SWR loss, dB and Watts power loss.
[ Hits: 251 | Votes: 2 | Rating: 5 ]
Coax Cable Attenuation and Power Handling Online Calculator - An on-line coaxial cable attenuation and total power handling calculator, with a lot of cable properties already configured to give the Nominal Attenuation, Maximum Cable Assembly Insertion Loss, Average Power, Cable Vg anf Nominal Td
[ Hits: 229 | Votes: 2 | Rating: 2 ]
Ecoflex-15 Degradation - This article describes the problem detection on power loss events experienced during repeated usage of the Ecoflex-15 coax cable by members of the G3PYE contest minions and addressed to repeated coiling and uncoiling which has fractured the foil braid in numerous places.
[ Hits: 176 | Votes: 0 | Rating: 0 ]
How to assemble a BNC connector - How to install a BNC connector on a coaxial cable like the ELSPEC1030AF / HPF195RG and 58C/U cables
[ Hits: 196 | Votes: 0 | Rating: 0 ]

Grounding HF Transceiver using Coax Cable - Improper grounding or earthing system can cause several unwanted RF interferences (RFI) to television sets, broadcast receivers, hi-fi sets and telephone sets. In this Article the author explain how to setup a proper radio shack grounding using coaxial cable and ceramic disc capacitor
[ Hits: 1291 | Votes: 4 | Rating: 7.75 ]

Cost-effective ferrite chokes and baluns - In this article the author describes some new designs of ferrite loaded chokes for suppressing unwanted common mode currents at HF applied to feed lines like choke baluns, but also in the shack, applied to various coaxial, mains and data cables
[ Hits: 861 | Votes: 5 | Rating: 6 ]

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 ]