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.
Type number KA1-211X KA1-408X KA1-411X Gain table / size Frequency (MHz) 14-50 7-50 7-50 The total number of elements 11 Elements 8 Elements 11 Elemen... Read more
Bandwidth at it’s broadest! VSWR 2:1 or better at band edges on 10-40 meters. Up to 100 kHz. on 75/80 meters. Solid one inch fiberglass trap f... Read more
Tornado Tuner 80D being fitted onto a Force 12 Magnum 80 meter rotatable dipole as seen from underneath Price 659,95 – USD See More : Lin... Read more
Get Your Ham Radio License You are only 35 questions away from getting your Ham radio license. The questions come from a pool of questions publ... Read more
ARRL partner RFinder, the creator of a web and app-based directory of Amateur Radio repeaters worldwide, will supply all data for the 2017-2018 ARRL R... 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
Short video showing how I receive an email sent from gmail over my Ham radio. Read more
“Remote Antenna Tuners” is the topic of the just-released episode of the “ARRL The Doctor is In” podcast. Listen…and learn! Read more
Operating mode: A1A(CW)，A3E(AM)，J3E(USB/LSB)，F3E(FM) minimum frequency stepping: 1Hz Antenna impedance: 50Ω Operating temperature range: -10℃ ~ +60℃ F... Read more
About 5 years ago, M2 Antenna Systems introduced a high power solid state amplifier for 6 meters (model 6M-1000) capable of a full kilowatt of output.... Read more