band conditions
16 links
Antennas : 40M : 40 meter Delta Loop Antennas
- Delta Loop for 40 and 20 meter Band by UR0GT
- This wire antenna for 40 and 20 meter band feature a good SWR. Horizontal side of the antenna is placed at two meters above the ground. Impedance of the antenna are depending by the height of the base from the ground and conditions of the ground
[ Hits: 532 | Votes: 5 | Rating: 7.8 ]
- Coax Notch Traps - Attenuating adjacent bands
- Targeted Attenuation for Adjacent Bands.
Filtering is needed between the two rigs to prevent physical damage to the RX front end and to prevent the kinds of high-signal overload conditions like desense and IMD - as well as containing harmonic energy.
[ Hits: 134 | Votes: 0 | Rating: 0 ]
- Basic Microwave Antennas
- Utility-Driven Tradeoff Analysis, if you want to geto on the microwave bands , you will have to choose the proper antenna for your operating conditions. How to decide is not always easy, and you may also decide to build your own antenna.
[ Hits: 354 | Votes: 1 | Rating: 9 ]
- MJ JERSEY
- Several belgian hams will be qrv from Jersey between the 24 till 30 may 2013 , the aim is to be qrv on 2 M, 6 M, from 10m to 160 m , SSB and CW, PSK with an emphasis on the higher bands , conditions permitting
[ Hits: 188 | Votes: 0 | Rating: 0 ]
- FDMDV - Digital Voice
- FDMDV - Frequency Division Multiplex Digital Voice
Digital Audio over HF SSB.
FDMDV is the latest digital voice mode on HF - it caters to high quality digital voice under poor band conditions, in only 1100Hz bandwidth
[ Hits: 5515 | Votes: 6 | Rating: 7.83 ]
- HF Antennas for restricted space
- Arrl document about invisible antennas and indoor systems. It is important to consider that few compromise antennas are capable of delivering the performance one can expect from the full-size variety. But the patient and skillful operator can often do as well as some fellows who are equipped with high power and full-size antennas. The "cliff-dweller" may not be able to "bore a hole" in the band as often, and as easily, but DX can be worked successfully when band conditions are suitable.
[ Hits: 9184 | Votes: 7 | Rating: 5.28 ]
- Making Sense of Solar Indices
- Undesrtanding three band conditions indicators to undestand current and future propagation conditions, solar flux, Ap and Kp indices
[ Hits: 148 | Votes: 0 | Rating: 0 ]
- On-Line HF Propagation Prediction
- *One single page* gives you an immediate overview of current shortwave propagation conditions at your location.
[ Hits: 14230 | Votes: 215 | Rating: 7.72 ]
- Band Conditions
- Current HF band conditions online report and graphs. This page provides band condition information to CW and SSB Contesters. It can also be of benefit to other Radio Amateurs to determine band condtions for Nets and casual QSO
[ Hits: 3515 | Votes: 22 | Rating: 7.9 ]
- 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: 32 | Votes: 1 | Rating: 10 ]
- DUAL
- Antenna and ham equipment manufacturer in Serbia.
The Dual company has been producing antennas for more than 25 years focusing on wide bandwidth, designs that work equally well in all weather conditions, very low SWR and superior G/T, F/B and F/S ratios
[ Hits: 398 | Votes: 2 | Rating: 6 ]
- AN-SOF - Professional Antenna Simulation
- AN-SOF is a professional comprehensive software tool for the modeling and simulation of antenna systems. AS-SOF allows to describe antenna geometry, Choose construction materials, Describe the environment and ground conditions, Describe the antenna height above ground, Analize radiation pattern and front-to-back ratio, Plot directivity and gain, Analize input impedance and VSWR,Predict antenna bandwidth
[ Hits: 240 | Votes: 1 | Rating: 10 ]
- Ipox5 voip remote link software
- Ipox5 is a free version of the commercial remote base fixed link system. It allows radio to radio links with PC users access, and is secure (ie private use for taxi companies and remote offices to access remote base etc)and works over broadband. It is designed to maintain a link and work under all conditions. There are no restrictions for non-commercial use.
[ Hits: 1319 | Votes: 5 | Rating: 10 ]
- FSQCall Fast Simple QSO
- FSQ is a Fast Simple QSO mode designed specifically for HF. It works well under NVIS and sunrise/sunset conditions on the lower bands, and also works well for short skip and grey-line on higher bands and can be used also on VHF FM.
[ Hits: 184 | Votes: 0 | Rating: 0 ]
- Variable bandwidth cw filter
- As the sunspots return and DX propagation conditions to improve, the age old problem with QRM begins to show up on the amateur bands. Thif filter help you on improving reception
[ Hits: 1150 | Votes: 3 | Rating: 4.33 ]
- SSB Microphone Filter
- Build this circuit to tailor your microphone response to different band conditions. A project by KG4JJH
[ Hits: 464 | Votes: 1 | Rating: 1 ]
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