220 band
14 links
- Tri-Band J-Pole
- This strange looking antenna is a combination of Coupled-Resonator principle by K9AY and a quarter stubs to achieve low angle radiation pattern. Designed with 4nec2 NEC based antenna modeler and optimizer for 145/220/440MHz bands
[ Hits: 1913 | Votes: 5 | Rating: 9 ]
- 3 band J-Pole Antenna
- Pictures of a 2 meter, 220, 440 copper J-Pole antennas
[ Hits: 2607 | Votes: 12 | Rating: 6.08 ]
- Multiband J-Pole Antenna by IZ0UPS
- A multiband J-Pole antenna project that cover 144,220 and 430 MHz. The articles includes several pictures of this multi-band antenna, including handmade schematics and diagrams, project is mainly in Italian
[ Hits: 411 | Votes: 4 | Rating: 7.25 ]
- Tri-Band VHF/UHF Antenna Design
- The TBJ-1 – a triband base antenna was published in March 2017 QST. This antenna covers 2M/220 MHz/70cm in one 6ft 3/4 inch PVC pipe and requires no radials.
[ Hits: 210 | Votes: 0 | Rating: 0 ]
- The Ventenna
- Rugged, disguised 2m, 220MHz, 440MHz, and 2m/440 dual band antennas, HF portable antennas, portable dipoles.
[ Hits: 4580 | Votes: 19 | Rating: 8.21 ]
- Low Frequency Transmission Modes
- Article by W1TAG on operating modes used on low-banding.
The 2200 meter band (135.7 - 137.8 kHz) is only 2.1 kHz wide, so voice work on SSB or AM is out. Find out the best modes on LF
[ Hits: 437 | Votes: 0 | Rating: 0 ]
- Propagation on 630 Meters and 2200 Meters
- This is a theoretical look at propagation on 630-Meters and 2200-Meters using ray tracing software. It expands on the brief discussion in the ARRL Handbooks.
The Earth's magnetic field affects 630-Meter and 2200-Meter band propagation. Lower ionization reduces absorption, aiding low-frequency propagation. Differences exist between bands, limited daytime sky-wave propagation. Sunrise/sunset show promise, yet mechanisms are unclear. Ducting possible at night in specific conditions. Negative ions enhance propagation. Inefficient antennas and high man-made noise are anticipated. Groundwave propagation is significant on 2200-Meters.
[ Hits: 36 | Votes: 1 | Rating: 10 ]
- IC-2720H Extended TX/RX Mod
- IC-2720H it will receive fine on 220MHz amateur band, but will NOT transmit there
[ Hits: 2306 | Votes: 8 | Rating: 7.87 ]
- SB220 SB221 arcing problems improvements mods
- This article explores the claim an amplifier might arc from a parasitic oscillation, damaging capacitors, bandswitches, or other components.
[ Hits: 1307 | Votes: 2 | Rating: 10 ]
- 137.7kHz QRSS on one chip
- This article describes a simple QRSS beacon exciter for the DX portion of the 2200m amateur band.
[ Hits: 595 | Votes: 0 | Rating: 0 ]
- 137 kHz antenna preamplifier
- A simple 137 kHz antenna preamplifier to make your FT-817 (and others) useable on 2200m band.
[ Hits: 1184 | Votes: 3 | Rating: 6.67 ]
- Cross Band Repeaters
- Crossband Repeating is a process where a Ham transmits one signal on one band (typically UHF), and it is received by another radio with a better antenna/power installation, and re-transmitted (typically on VHF) to another radio system, or a repeater. Everyday examples of cross-band repeaters are repeater receive sites that hear the input signals on 2m and retransmit those signals on a frequency higher than 220 MHz.
[ Hits: 206 | Votes: 0 | Rating: 0 ]
- 70cm Mini Transverter
- A low cost, low power microwave transverter so that you can operate easily on 70cm band even with a HF or VHF transceiver
[ Hits: 389 | Votes: 0 | Rating: 0 ]
- 70cm Mini-Transverter Project
- The project in this article illustrates how to do this in a simple and low cost way so that you can easily access the microwave bands using the existing HF or HF/VHF transceiver as IF.
[ Hits: 252 | Votes: 2 | Rating: 9 ]
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