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Antennas : 2M
- Stacked 7-Element-2m-Yagis
- These yagis and groups were designed with YO7.23 from K6STI and checked with EZNEC from W7EL. With a gain of 14/17/20dBd they have a good relation between gain and mechanical problems.
[Hits: 3278 | Votes: 5 | Rate: 5.40] Antennas : Magnetic Loop
- Thinking about Ideal Loops
- Loop antennae have been used from ELF to UHF since the beginning of radiocommunications. At low frequencies, the main problem for loop antennae is to have enough sensitivity; the antenna being very small respect to the wavelength the collected energy is also small. To increase the output level the loop may be made resonant, so loosing it%u2019s intrinsic aperiodic characteristics.
[Hits: 1338 | Votes: 0 | Rate: 0.00] Antennas : Theory Antennas : Wire Contesting : Software
- ARIDX by UA1AAF
- At the moment the most used program is UA1AAF. It is an excellent program written by Boris, UA1AAF, to handle ARI International DX Contest. It can simulate K1EA or N6TR workings; it will be possible to connect the RTX to the computer using a standard interface in such a way as to transmit directly in CW from the keyboard; most of the controls are like K1EA's CT and N6TR's TR ; on line help provides almost all the information necessary for using the program. Is possible to insert QSO after the contest. An appropriate utility in included for conversion in ADIF format. The program is very small and therefore works without any problems on any IBM compatible computer with DOS 3.3 and over or Windows 95/98.
[Hits: 974 | Votes: 4 | Rate: 5.50] Manufacturers : Accessories Operating Aids : Beginner's Guides
- About digital modes
- The digital modes provide a wonderful opportunity for those of us who would like to work on the HF bands but find CW too difficult and SSB phone prohibitive because of interference problems. The digital modes are easy to set up and get operating, require low power and a narrow band.
[Hits: 5902 | Votes: 6 | Rate: 8.00] Operating Modes : Longwave
- VLF-LF And the Loop Aerial
- The article discusses the theory of loop aerials for receiving and how they reduce the level of local noise. A Loop Aerial is described suitable for use on the LF and VLF bands together with a circuit of an interface loop tuner and preamplifier. The discussion extends to the problems of amplifier noise and the advantages of tuning the loop.
[Hits: 2607 | Votes: 5 | Rate: 5.40] Operating Modes : Stealth Amateur Radio
- Hidden and stealth antennas
pop
- Antenna Restrictions, Power Restrictions, RFI Problems, or Limited Space keeping you off the air?
[Hits: 32048 | Votes: 9 | Rate: 6.67] Radio Equipment : VHF-UHF Handhelds : Baofeng UV-3R
- Baofeng UV3R comments
- A Review of the Handheld VHF/UHF Transceiver with known problems and cool features
[Hits: 296 | Votes: 2 | Rate: 5.50] Shopping and Services : Radio Equipment Repair
- ESP
- ESP provides repair service down to the component level. We offer reasonable rates. Out-of-date equipment is not a problem.
[Hits: 565 | Votes: 3 | Rate: 8.33] Software : Satellite tracking
- Gpredict
- Gpredict is a satellite tracking program for Unix-like operating systems. In the begining (v. 0.1.x) Gpredict was just a GUI client to John Magliacane's excellent satellite tracking program, Predict, but due to performance problems it has been decided to include the tracking code directly into Gnome Predict (v. 0.2.0 and later).
[Hits: 1055 | Votes: 4 | Rate: 8.75] Technical Reference : Amplifiers
- Tube Amplifier data and tech info
- Source of common model manuals and amateur help on amplifier problems for the amateur bands, Discussion of vacuum tube amplifiers. Technical information and discussion of obselete tube replacement.
[Hits: 4275 | Votes: 0 | Rate: 0.00] Technical Reference : CB Radios
- Firestik Library
- Information regarding CB radio and the problems you may encounter during installation and use of your system.
[Hits: 4341 | Votes: 18 | Rate: 8.66] Technical Reference : Filters
- Mode J Desense Filter
- This type of filter can be used in a Mode J satellite station (uplink on 2m, downlink on 70cm) to reduce the problem of the uplink signal desensing the receiver
[Hits: 806 | Votes: 2 | Rate: 5.00] - 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: 793 | Votes: 3 | Rate: 4.33] - Filters for NDB reception
- RF Filters to help with NDB reception problems
[Hits: 881 | Votes: 1 | Rate: 10.00] Technical Reference : Grounding Technical Reference : HF Radios
- Fox Tango International
- Yaesu FT-101 Users Group purpose and scope is to serve as a sort of benevolent, protective, mutual aid and social club, essentially for the purpose of interchanging information, ideas, experiences and problems. By and for owners of Yaesu amateur radio equipment. Founded in 1972 by Amateur Radio operator Milton Lowens N4ML
[Hits: 1479 | Votes: 251 | Rate: 8.85] - ICOM IC-746PRO Dead TX
- The purpose of this web page is to try to investigate the ICOM IC-746PRO Dead TX problem reported by many radio amateurs through out the world; and unfortunately not properly taken care of by ICOM. If you are the owner of either the ICOM IC-746PRO or the IC-7400 you may already have experienced the Dead TX Issue. If not you may sooner or later.
[Hits: 2974 | Votes: 5 | Rate: 9.20] Technical Reference : Radio Frequency Interference
- Interference Handbook
- Interference to home electronic equipment is a frustrating problem; but, fortunately, there are several ways to deal with it. This handbook provides a step-by-step process for eliminating the interference
[Hits: 3694 | Votes: 2 | Rate: 5.50] - Telephone Interference
- Telephone EMI, questions and answers on how to solve interference problems to phone lines
[Hits: 836 | Votes: 0 | Rate: 0.00] - TVI filters
- These filters are in use by hundreds of VHF weak signal operators and have been proven to be an
effective solution for fundamental overload problems.
[Hits: 897 | Votes: 1 | Rate: 7.00] - Cellular Phone Interference
- Cellular Phone Interference and 800 MHz Public Safety Radio Systems: An Unforeseen and Dangerous Problem
[Hits: 718 | Votes: 0 | Rate: 0.00] Technical Reference : Radio Frequency Interference : BPL
- Broadband over power lines
- PLT/PLC/BPL/DPL - it doesn't matter what you call it said one of our readers it has significant technical problems
[Hits: 188 | Votes: 0 | Rate: 0.00]
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