NVI 40 Meter Antenna Modeling
- The idea of using a low mount dipole, enhanced with reflector wires directly beneath the dipole, on the ground, appears to be a very good approach to creating an NVI specific antenna for local HF operation.
The Hudson antenna
- A vertical antenna for 80 and 40 meters project with lots of assembling pictures and plan by LU9DPD in spanish
Feeding an End-Fed Antennapop
- End-Fed antennas are NOT balanced systems; but neither are verticals, groundplanes, discones, windoms, zepps, Marconis, half-slopers, et al. Additionally, the low-impedance antenna port of your transmitter/receiver is not balanced.
Quarter Wave Verticals
- One of the most useful antennas in the repertoire is the Marconi or quarter wave grounded vertical antenna. Its invention made it possible to halve the length of antennas, simplifying communications, especially at HF and below.
European 135.7 - 137.8 kHz Band Plan
- This is not an officially recognized band plan for the European LF allocation between 135.7 and 137.800 kHz. This plan just contains my own observations and shall help the newcomer to get some orientation on where to find what.
US Band Plan by ICOM
- ICOM USA Amateur Radio HF VHF/UHF band plan updated to 2008, include a Common Country prefixes in PDF Format
- PlanePlotter receives and decodes live digital position reports from aircraft and plots them on a chart.
Using PlanePlotter, you can see a radar-like display of all those aircraft around you that are transmitting the appropriate digital messages including ACARS, ADS-B and HFDL.
Ameritron AL-1200 to gs35b Conversion
- The Ameritron AL-1200 Amplifier is in current production. In its factory configuration it uses a single 3CX1200A7 (triode) tube, grounded grid configuration. Re-tubing the AL-1200 with a GS-35b with success.