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794 links - and 17 categories

Baluns in antenna systems - Understanding Baluns. This article explores some simple antenna system configurations and the effect of key system components, connections and dimensions on feed line common mode current.
[ Hits: 1106 | Votes: 2 | Rating: 2.5 ]

Delta Loop for HF - Planning and modelling Delta Loop antennas for all the ham radio HF bands include calculated wire lengths at each mid-band
[ Hits: 2049 | Votes: 5 | Rating: 5.8 ]

A Dual Mode Horn Antenna - Dual mode horm antenna for 10 GHz nu G3PH0
[ Hits: 631 | Votes: 2 | Rating: 9.5 ]

Using MMANA-GAL for antenna modelling - G0KYA MMANA-GAL presentation and samples
[ Hits: 589 | Votes: 5 | Rating: 4.8 ]

T Match efficiency estimator - This calculator estimates the efficiency of a T match tuner using a simple loss model.
[ Hits: 583 | Votes: 1 | Rating: 4 ]

K-Y Filter Company - Modem Telephone Super Filters For HF and AM Radio Interference.
[ Hits: 355 | Votes: 0 | Rating: 0 ]

Xggcomms Icom Yaesu CAT Interfaces - Xggcomms specialise in producing cost effective, high quality CAT and Audio interfaces for Icom and Yaesu Amateur Radio Equipment. Our interfaces are fully compatible with a large range of CAT and Digital Mode control software.
[ Hits: 325 | Votes: 0 | Rating: 0 ]

HSMM Experiments on the 6M Amateur Band - Progress Report on VHF OFDM Modem submitted by John B. Stephensen, KD6OZH ARRL Pdf file
[ Hits: 788 | Votes: 0 | Rating: 0 ]

Amtor the forgotten digital mode - N4ZOU Article on AMTOR mode on eham.net
[ Hits: 354 | Votes: 0 | Rating: 0 ]

How To Get Started On EME - Moonbounce is the ultimate long path DX. It is exciting and allows you to literally work the world on VHF and UHF. It is not as difficult as you may think. Here is how to get started on this most exciting mode
[ Hits: 455 | Votes: 2 | Rating: 5 ]

Hell Formats - Here is a simple definition of all the Hellschreiber modes
[ Hits: 344 | Votes: 0 | Rating: 0 ]

Baycom modem schematic - A 1200 baud Baycom modem schematic by SP3EJJ
[ Hits: 868 | Votes: 2 | Rating: 7.5 ]

QRP Calling Frequencies - QRP Popular Frequencies, where to operate in QRP mode
[ Hits: 786 | Votes: 2 | Rating: 5.5 ]

Yaesu FT-817 review by G3XBM - Yaesu FT817 all band, all mode handheld transceiver article.
[ Hits: 772 | Votes: 0 | Rating: 0 ]

DroidSSTV - DroidSSTV lets you transmit and receive amateur radio (ham radio) slow scan TV (SSTV) on your Android Smartphone or Android tablet. This communications app is a great tool for portable amateur radio SSTV operation. Just connect your Android phone or tablet to an HF radio, tune on to an SSTV frequency, and watch the pictures scroll onto the screen. DroidSSTV supports the modes Scottie 1, Scottie 2, Scottie DX, Martin 1, and Martin 2 at this time.
[ Hits: 699 | Votes: 6 | Rating: 9.17 ]

idealCircuit - IdealCircuit is an analog circuit simulator working with true ideal components. It uses exactly the same unique and robust algorithm as NL5 Circuit Simulator. Simple and intuitive interface, fewer components and models, no fancy and powerful features that are only useful for specialized applications.
[ Hits: 465 | Votes: 0 | Rating: 0 ]

Couplings Designer - Couplings Designer for iPhone. Modern advanced filter synthesis using coupling matrix techniques. There's a free LITE version limited to 4th order filters.
[ Hits: 399 | Votes: 2 | Rating: 5.5 ]

Experimental 2 Mbit modem - Description of a 2 Mbit Modem project
[ Hits: 284 | Votes: 0 | Rating: 0 ]

Common mode current - Balanced and Unbalanced Systems
[ Hits: 285 | Votes: 0 | Rating: 0 ]

PSK31 interface - A simple PSK31/digital interface which can connect your transceiver to a PC soundcard for digital modes.
[ Hits: 850 | Votes: 0 | Rating: 0 ]