The May/June issue of QEX, ARRL’s bimonthly magazine for experimenters, is off the press and in the mail!
In this issue . . .
Michael Knitter, DG5MK, describes a complex-impedance analyzer that uses a heterodyning technique and high resolution ADCs to get good accuracy at low cost.
Robert H. Sternowski, WBØLBI, uncovers old measurements, which show that vertically and horizontally polarized noise can differ by tens of decibels in the lower HF bands.
Paulo Renato F. Ferreira, PY3PR, updates the Octopus V/I curve tracer by providing selectable scanning voltages for testing.
Maynard A. Wright, W6PAP, provides Octave software for computing the performance of transmission lines having a complex characteristic impedance.
Riccardo Gionetti, IØFDH, describes an automatic tracking filter for a DDS generator.
Euclides Lourenço Chuma, PY2EAJ, describes a modern RF power meter with accuracy that rivals the best commercial RF power meters.
Antennas and more questions from the Technician exam pool. Read more
Check out this YouTube clip that Ulf SM3RAB made A/Bing the K1N DXpedition on a Magnum 340 full-size 3 element Yagi that uses the G0KSC OP-DES feed sy... Read more
The CHA WINDOM 40 antenna is designed for 40m, 20m & 10m. A tuner may be needed to tune the other bands between 80M and 6M. Power handling is 250W... Read more
FlexRadio Systems and Marcus Roskosch, DL8MRE announced today a partnership to develop, market and sell a client interface application for both iPad®... Read more
Radio Waves The modern world is awash in a sea of radio waves — currents of electromagnetic radiation upon which our digital lives depend. What if you... Read more
DX Hunter – The amateur radio App for DX-enthusiasts Description DX-Hunter is an application for amateur radio operators, short wave listeners a... Read more
The European Radio Amateurs’ Organization, together with the 30 Meter Digital Group , announce a new party on the air, this time with the... Read more
Digital Modem can encode/decode BPSK31/63, RTTY, QPSK and CWmodes without PC, specially for portable digital communication。With its internal high perf... Read more
The Connect Systems CS800/801 (UHF/VHF) is a new value priced DMR mobile radio being offered by Connect Systems, as part of its line-up of budget DMR... Read more
“Curiosity got the best of me. I finally ordered a DMR handheld radio and picked the new TYT MD-2017 UHF/VHF DMR Analog unit. I’ve never u... Read more