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44 links

VHF Baluns: Fact and Fancy - Our ideas about HF baluns have changed dramatically in recent years. The focus today is very much on suppressing unwanted common-mode RF currents, to reduce both the received noise levels and the risks of causing interference on transmit.
[ Hits: 283 | Votes: 0 | Rating: 0 ]

QRP Link Dipole Antenna - Dipole antennas are some of the simplest antennas to build in addition to being very efficient and solid performers. I wanted to make a simple dipole antenna for QRP portable operation that could be used on multiple bands.
[ Hits: 283 | Votes: 2 | Rating: 7.5 ]

Chokes and Isolation Transformers for Receiving Antennas - Chokes and isolation transformers are essential for receiving antennas to mitigate common mode current, which induces noise and interferes with signal quality. Common mode chokes, formed by winding feedline through ferrite cores, block unwanted current effectively. Proper selection of core material and winding turns ensures resonance near the operating frequency, reducing interference. Isolation transformers further minimize interference, crucial for multi-transmitter stations.
[ Hits: 59 | Votes: 1 | Rating: 9 ]

Performance of 49:1 Ferrite Core Transformers - There are quite a few recipes for building a suitable transformer for an end fed half wave antenna (EFHW), but I was never sure I really understood the main principles. So, I wound a bunch of transformers, made measurements on them using my NanoVNA, learned how to get what I really wanted out of the VNA measurements, and in the process discovered how to build better transformers and be able to predict what they will do
[ Hits: 151 | Votes: 4 | Rating: 7 ]

The Wanted Alive - dThe latest digital-mode DX-spots served to you with different approach - sorted in order of decreasing DXCC most wanted ranking.
[ Hits: 61 | Votes: 0 | Rating: 0 ]

Decatur County Amateur Radio Club - Decatur County Amateur Radio Club, callsign KW4DC, was formed in 2009 by a group of amateur radio operators who wanted to promote and enjoy the amateur radio hobby together.
[ Hits: 135 | Votes: 1 | Rating: 10 ]

Cb Radio Ads - For sale used unwanted HAM and CB Radios for sale in your area. Post your unwanted radio items to others for free.
[ Hits: 6 | Votes: 4 | Rating: 10 ]

Radio Sound Examples - Always wanted to know what kind of sounds we hear, when listening to the radio? Here are some examples
[ Hits: 459 | Votes: 2 | Rating: 4.5 ]

How I Installed a Ham Radio Antenna on my Truck - I wanted to mount an amateur radio antenna on my truck that was more permanent than the magnetic mount on I already had, but I had a few specific design requirements for the project.
[ Hits: 220 | Votes: 0 | Rating: 0 ]

Samuel F. Morse Amateur Radio Club - SFMARC Sacramento, CA. The Samuel F Morse Amateur Radio Club was formed by those that mainly enjoy CW. We wanted a way to bring others together who also have an interest in operating CW on-air and share the love of Field Day.
[ Hits: 386 | Votes: 0 | Rating: 0 ]

Cushcraft R-8 review - With my present QTH a beam antenna is no option, but I wanted a multiband antenna which covered as many bands as possible. After some investigations I decided to put my money in the Cushcraft R-8.
[ Hits: 259 | Votes: 0 | Rating: 0 ]

ZCZ Cluster - Telnet client for DXCluster, Sorts, colours and filters DX Spots by (2) bands, wanted DX Station, who spotted the DX, local to your area and more, Can spot automatically after logging a contact if you are using ZCZ Log, Look up call on QRZ.com
[ Hits: 160 | Votes: 0 | Rating: 0 ]

Online Morse Code Training - Learn Morse Online in 40 lessons with this web based morse code learning program, based on the Koch method. Choose the lesson, adjust the wanted parameters, and start the transmission of a set of random characters based on chosen lesson. Recognize the code and verify it at the end of the lesson.
[ Hits: 366 | Votes: 2 | Rating: 10 ]

CW Morse Decoder for Arduino - While there are quite a few standalone Morse Code or CW decoders out there, I wanted to tackle the problem myself and end up with both a great Arduino learning project and a decent portable decoder for when I'm out in the field operating QRP
[ Hits: 201 | Votes: 1 | Rating: 10 ]

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 ]

CW Key-to-Rig Switch Box - This is an easy afternoon project to switch multiple cw keys between several rigs. If you've ever wanted to change keys on one rig or use one key on several rigs, this gadget makes it easy. Plug keys into the box inputs, and plug each of the box outputs into a rig. No need to fumble around behind the rigs to move a key from one to another or to swap paddles for a bug.
[ Hits: 46 | Votes: 0 | Rating: 0 ]

How Common Mode Chokes Work - Examine the function and operation of a common mode choke and the way it reduces unwanted interference. Common Mode Choke vs. Single Choke
[ Hits: 738 | Votes: 2 | Rating: 10 ]

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: 864 | Votes: 5 | Rating: 6 ]

Filter your Raspberry PI Transmitter - How to limit unwanted harmonics from your raspberry Pi radio transmitter by introducing filters.
[ Hits: 345 | Votes: 1 | Rating: 1 ]

TVI filters - Examples of absorbtive low-pass filters in which the unwanted high-frequency energy is separated from the wanted output and then dissipated in matched resistors
[ Hits: 356 | Votes: 0 | Rating: 0 ]