cable cal
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Antennas : Antenna Calculators- 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: 168 | Votes: 0 | Rating: 0 ]
- BalUn for Delta-loop & Quad-loop antennas
- This Guide helps you to build the 1:2 BalUn 600 Watts DIY kit step by step. If a delta-loop or quad-loop antenna is powered with a coax cable from the transceiver it is necessary to use a 1:2 BalUn. This 1:2 BalUn uses a symmetrical 1:2 impedance transformer.
[ Hits: 286 | Votes: 1 | Rating: 9 ]
- 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 ]
- DIY Dual Band 144-440 MHz vertical antenna
- A homemade VHF/UHF vertical antenna made essentially with RG58 coax cable, with a 9 turns choke balun to prevent the shield acting as a RF Radiator.
[ Hits: 1376 | Votes: 14 | Rating: 5.5 ]
- FBK 2m-70cm dualband coax antenna
- A travel, or a fixed vertical coax antenna originally designed by PA0FBK. This antenna is very easy to make from a piece of 50 ohm or 75 ohm coaxial cable, and can be either smooth, roll-up version, or rigid cable
[ Hits: 354 | Votes: 3 | Rating: 9.33 ]
- 20-30m Vertical Antenna
- Homebrew project for a vertical antenna with a coaxial-cable trap, that works on 20 and 30 meters band.
[ Hits: 73 | Votes: 0 | Rating: 0 ]
- Ribbit digital text messaging mode for HF/VHF/UHF
- Ribbit is a novel digital text messaging mode for VHF/UHF communications for recreational and emergency use which radically increases the density of information transmitted by spectrum used. It leverages the computing power of the modern smartphone to increase the capabilities of any Handy Talkie without requiring any additional hardware or cable. A Ribbit message is fixed in duration at 1250 milliseconds. It is sent over audio modulation with a 2kHz bandwidth centered on 1.5kHz. It is preceded by 400ms of white noise to open analog squelch circuits.
[ Hits: 133 | Votes: 1 | Rating: 10 ]
- Baofeng Mic Pin Out and Programming Cable Schematics
- Speaker Microphone Pin Out, Dual PTT Switching,Programming Cables, SMA Antenna Connection, Extended Antenna Threads for Baofeng UV 3, UV 5 Series handheld transceivers
[ Hits: 1084 | Votes: 8 | Rating: 8.75 ]
- Programming Yaesu FT-8800R
- Programming the FT-8800R via the front panel and microphone keypad is not extremely difficult. Already having a list of local repeaters in CHIRP, the addition of a USB cable would allow you to coordinate the memory layout across multiple radios with ease.
[ Hits: 297 | Votes: 1 | Rating: 1 ]
- USB-C charging for Handheld Radio Transceivers
- The article highlights the common absence of modern USB-C ports on handheld ham radios and the limited use of USB for power. The author, [jephthai], shares a solution involving a USB-C cable with power negotiation capabilities, allowing the radio to be powered by USB. By splicing Anderson power pole connectors onto the cable, the radio can now be conveniently powered by a USB battery bank, providing a practical alternative to traditional 12 V batteries for off-grid operations.
[ Hits: 142 | 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: 252 | 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 ]
- Everything You Need To Know About Coaxial Cable
- An technical page on coaxial cables that describes what coax cables are, how do coax cables works, what are RG cables and difference with several coax cable types, what they are used for, connector types and cable sizes
[ Hits: 158 | Votes: 0 | Rating: 0 ]
- Yaesu FT-891 Go-Box for POTA
- This article documents the author's latest go-box build for outdoor ham radio operations using a Yaesu FT-891 transceiver. The go-box is constructed from a plastic "50-cal ammo case" and contains various components, including the transceiver, LDG Z11 Pro autotuner, DIY Yaesu FH-2 remote control keypad, and an external battery. The author details the design considerations, the mounting of components inside the box, and addresses issues related to ventilation and cable management. The go-box is geared for CW operations and POTA activations, with further modifications planned for a microphone and DATA jack. This project allows for rugged, environmentally protected outdoor radio operations while maintaining portability.
[ Hits: 196 | Votes: 0 | Rating: 0 ]
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