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rf problem
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Antennas : Feed Lines : Choke
- Eliminating TX RF Feedback Problems
- Malfunction of transceivers due to stray RF pickup is a common problem, especially when using end-fed antennas, high-impedance feedlines, or a poor ground counterpoise
[Hits: 1286 | Votes: 1 | Rate: 1.00] Antennas : Theory : Impedance matching
- Gamma Match Article
- A working analysis of the gamma-match problem that gives usefull practical results. New light on the question of when it will and when it won't give a perfect match to the coaxial transmission line.
[Hits: 1183 | Votes: 0 | Rate: 0.00] 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: 5901 | 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 : Mobile
- Choking on RF
- The intrepid newcomer encounters common mode problems in a mobile environment. Implementing some common mode chokes will be possible to reduce interferences
[Hits: 843 | Votes: 0 | Rate: 0.00] 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 : HF Transceivers : Icom IC-7000 Radio Equipment : HF Transceivers : Icom IC-746
- IC-746PRO TX Problem
- The IC-746PRO is a great rig. But it has a few reliability issues, especially with the earlier-production units. This article addresses four problem areas:. IC151 on the RF Unit.
Driver circuit on the PA Unit. HRX-muting circuit on the CTRL Unit. Predriver on the PA Unit.
[Hits: 1263 | Votes: 3 | Rate: 9.67] 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 : RF Amplifiers Theory
- Power Gride Tubes
- Article on tubes and their usage in power amplifiers design. Explain failures of tube in RF power amplifiers, a common problem in the SB-220 SB-221, TL-922 and other amplifiers.
[Hits: 557 | Votes: 1 | Rate: 3.00] Technical Reference : Electronics
- Using ferrite for interference suppression
- Excellent guide to using ferrite cores for interference suppression.
Understanding and Solving RF Interference and Noise Problems by Jim Brown K9YC Audio Systems Group, Inc. PDF File
[Hits: 3145 | Votes: 6 | Rate: 9.50] Technical Reference : Filters
- Filters for NDB reception
- RF Filters to help with NDB reception problems
[Hits: 881 | Votes: 1 | Rate: 10.00] - Interferences and filtering
- General information on Filter passbands, interferences, TVI and RFI problems
[Hits: 870 | Votes: 1 | Rate: 10.00] - 5th order High Pass VHF Filter
- Sometimes many VHF-UHF modern transceivers have problems with BROADCAST Interference and CROSS-modulation from FM commercial broadcast stations this article shows a simple Batteworth HI-Pass VHF Filter to reduce this problem
[Hits: 707 | Votes: 6 | Rate: 6.00] Technical Reference : Grounding 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] - 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] - RFI From Computer Networks
- Is your router shutting you down ?
[Hits: 375 | Votes: 0 | Rate: 0.00] - Automotive Interference Problems
- Installing mobile radios in your new megabucks car can be a frightening proposition - especially if RF from your rig could damage your shiny new roadster
[Hits: 552 | Votes: 0 | Rate: 0.00] - Track down television interference
- Nearly half of all reception problems are due to deficiencies or faults in the television receiver, the aerial lead or the aerial. This article will help you to check whether the problem you are having is due to one of these causes.
[Hits: 214 | Votes: 0 | Rate: 0.00] - Television Interference - TVI
- VR2XMT article on TVI and how to solve interference problems
[Hits: 305 | Votes: 2 | Rate: 5.50] - A Ham's Guide to RFI, Ferrites, Baluns, and Audio Interfacing
- Understanding and solving RF interference problems using ferrite
[Hits: 662 | Votes: 4 | Rate: 9.25]
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