rf cable

rf cable

Pages: [prev] 1 2 3 4 5 6 [next]

• 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: 194 | Votes: 4 | Rating: 8.75 ]

• 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 ]
• Choking balun for 160-30 meter band - Choking balun for lower HF and MF bands. (1.8MHz - 10MHz). Requiring a choking balun to isolate the potential RF pick up on the coax cable as it runs past equipment such as computer within the radio room at lower HF and MF frequencies a simple method of winding RG58 coax onto a Powdered Iron Toroid Core was constructed.
  [ Hits: 196 | Votes: 3 | Rating: 6 ]

• Build a Simple VHF Dipole Antenna for 2 Meters: A Beginner's Guide - This article serves as a beginner-friendly guide to constructing a simple VHF dipole antenna for 2 meters, perfect for novices in the hobby. With an emphasis on affordability and simplicity, it explains the basics without overwhelming technical details. Recommendations for coaxial cable and mounting methods are provided, offering practical solutions for effective communication. By following these instructions, novices can build a functional antenna without breaking the bank.
  [ Hits: 113 | Votes: 1 | Rating: 7 ]

• High Performance common-mode chokes - May 2015 Radcom Article on common-mode chokes that can be used for control cables, phone lines, but mostly on typical HF antenna systems. This article explain what common mode chokes does, why you meay need one, properties common mode chokes should have, how to build and measure performances.
  [ Hits: 687 | Votes: 1 | Rating: 10 ]
• RF Choke with Bifilar Windings - This article presents an RF Choke featuring an 11-bifilar turn winding of #14 house wire on a Fair-rite FT240-31 toroid. The choke is enclosed in a 3D-printed case from Thingiverse, though this may pose thermal concerns at higher power levels. With SWR concerns up to 30MHz, the author plans to employ two series chokes at the rig input for improved performance. This choke offers versatility for portable use, with potential mismatch resolution using an antenna tuner. Further testing is anticipated upon the arrival of new cables.
  [ Hits: 86 | Votes: 0 | Rating: 0 ]

• Optimizing Coax-Cable Traps - A document that will guide you on Coaxial-Cable trap optimization process to gain on global antenna performance and on increasing effective bandwidth.
  [ Hits: 166 | Votes: 0 | Rating: 0 ]

• 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 ]

• Reducing the Cable Mess - Optimizing the cable connections for cat control and audio input output by implementing the digirig mobile. A small audio and rig control interface, with a single USB cable supports most QRP radios requiring external audio and CAT control facilities
  [ Hits: 155 | Votes: 0 | Rating: 0 ]

• A RemoteQth Cable Adapter for Prosistel Rotator - If you are a RemoteQth server user, and own a Prosistel rotor, you will have to deal with the problem of remoting your rotor. The solution suggested by RemoteQth is to build the K3NG interface that allows you to control any types of rotor.
  [ Hits: 65 | Votes: 0 | Rating: 0 ]

• IC-7300 Amplifiers Interfacing - How to interface the Icom IC-7300 to RF Power amplifiers. Menu settings, cable connections and recommendations on how to avodi common errors that could even damage either the amplifier or the IC-7300
  [ Hits: 365 | Votes: 4 | Rating: 9 ]

• FT-817 CAT interface - Homemade custom CAT interface cable for the Yaesu FT-817 this article include schematics diagram for the interface and some pictures
  [ Hits: 126 | Votes: 0 | Rating: 0 ]

• Barest of bones APRS RF position reporter - Super Simple APRS Position Reporter. This project idea has been in response to the more hardware heavy Raspberry Pi projects that involve extra TNC hardware, additional sound cards, and custom cabling. This APRS position reporter is done using a Raspberry Pi B+, USB GPS receiver, Baofeng UV-5R, and a mono 3.5mm audio cable between the Pi and HT.
  [ Hits: 182 | Votes: 0 | Rating: 0 ]

• 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: 252 | Votes: 2 | Rating: 5 ]
• N-Type Connector on Cellflex Cable - Installation of Female N-Type Connector on 1-5/8 RFS Cellflex Cable
  [ Hits: 96 | Votes: 2 | Rating: 6.5 ]
• Understanding Impacts of 75-ohm Devices in 50-ohm Systems - This article explores the implications of using 75-ohm devices, common in TV setups, within 50-ohm systems. While mismatched cables and connectors may lead to minimal consequences in receive-only setups, potential losses and reduced isolation in splitters and taps are examined. The article concludes that, for general applications, inexpensive TV-type components can offer reasonable performance with some trade-offs
  [ Hits: 149 | Votes: 2 | Rating: 9.5 ]

• 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: 1293 | Votes: 4 | Rating: 7.75 ]

• Prevention and Suppression of RF Interference to Audio Systems - In this study, the author builds upon Muncy's research, demonstrating that radio-frequency current on cable shields affects audio systems through the "pin 1 problem" and shield-current-induced noise (SCIN). An enhanced equivalent circuit for ferrite chokes is proposed, addressing dimensional resonance and inductor self-resonance. Field tests confirm that chokes reduce interference across 500 kHz to 1,000 MHz. Guidelines for diagnosing and mitigating EMI from various sources are provided for product development and field installations.
  [ Hits: 47 | Votes: 0 | Rating: 0 ]

• Common-mode chokes Measurements - Common-mode chokes are useful solutions for RFI reduction. Winding a few turns of coaxial cable on the FT 240-31 toroid can reduced the noise below the received noise floor. In this article author measure different chokes
  [ Hits: 156 | Votes: 1 | Rating: 8 ]

• APRSdroid to a Baofeng Cable - Cable for connecting APRSdroid to a Baofeng UV-82 Radio (APRS via RF)
  [ Hits: 218 | Votes: 1 | Rating: 10 ]

Pages: [prev] 1 2 3 4 5 6 [next]