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Antennas : 4M- A centre-fed co-axial dipole for 4-m
- This design has the following advantages low-cost components, Easy to set-up - nothing to adjust, no metalwork required, and only four soldered joints!
[ Hits: 551 | Votes: 1 | Rating: 10 ]
- 4-BAND COLA ANTENNA 20-17-15-10m
- Concentric Open Loop Antenna Fed Off-Centre similar to the cobwebb antenna but resonating on 20-17-15-10 meters band
[ Hits: 9820 | Votes: 19 | Rating: 8.37 ]
- End Fed Half Wave Antenna Coupler
- Centre fed half wave dipoles make great, simple and effective antennas for the HF bands. Sometimes however, the centre feed is not ideal. This great project will improve the overall antenna performance.
[ Hits: 1426 | Votes: 1 | Rating: 10 ]
- 20m Indoor Loop Antenna
- This antenna can gets you on the air on 14MHz, and it has a useable frequency range. The VSWR is almost perfect at the centre-frequency abd the design uses no expensive components.
[ Hits: 664 | Votes: 4 | Rating: 6.75 ]
- Open-Folded W8JK Antenna for HF
- Originally designed by John Kraus, W8JK in about 1940, this antenna has some interesting properties.
The W8JK antenna is 2 (Two) centre-fed double-dipole fed by a pair of anti-phase signals. Small size, simple antenna, offer nice performance but need a tuner. Tested in this project from 30m to 6m bands
[ Hits: 139 | Votes: 1 | Rating: 3 ]
- The M0CVO HW-42HP OCF Antenna
- A multi-band off centre fed dipole, designed to operate on all bands from 40m (7MHz) to 6m (50MHz). Author claims it will operate on 40, 30, 20, 17, 15, 12 and 10m without an ATU (SWR <3:1) plus 6m with an ATU.
[ Hits: 272 | Votes: 0 | Rating: 0 ]
- Homemade Carolina Windom antenna
- An off centre fed dipole, with 10 feet of vertical radiator. It needs no tuner on 40m, 20m and 10m by M0UKD
[ Hits: 1303 | Votes: 1 | Rating: 1 ]
- Ontario Science Centre Amateur Radio Club
- The Ontario Science Centre Amateur Radio Club (OSCARC) provides volunteer support to the Amateur Radio (ham radio) demonstration station at the Ontario Science Centre in Toronto, Canada.
[ Hits: 507 | Votes: 1 | Rating: 7 ]
- Aluminium Warehouse
- Located in the centre of the UK with good grade aluminium,
[ Hits: 1116 | Votes: 0 | Rating: 0 ]
- Emergency ham radio frequencies
- These frequencies have been adopted into the bandplans of each IARU region to be a focus for emergency communications in their areas. They are not absolute frequencies but instead are centres of activity and emergency communications may be found around 20kHz from these centres. Some countries may maintain other emergency frequencies in their own bandplans due to local requirements, QRM etc
[ Hits: 75 | Votes: 0 | Rating: 0 ]
- Tropospheric Ducting Forecast Europe
- The areas noted in the forecast have the necessary atmospheric conditions to produce tropospheric bending of VHF, UHF and/or microwave radio waves. Tropospheric bending extends the range of radio & TV stations well beyond their normal limit and thus increases interference amongst stations as well.
[ Hits: 152 | Votes: 1 | Rating: 10 ]
- How to convert Maidenhead Locator to Latitude and Longitude
- Blog post by Adrian M0NWK showing how to calculate the latitude and longitude at the centre of a Maidenhead locator using basic maths.
[ Hits: 247 | Votes: 0 | Rating: 0 ]
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