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Most of the recent efforts here have been on transmitting antennas. You can see the progress by clicking here.
I enjoy amateur radio because there are so many things to learn. Amateur radio is also a great fraternity. You can learn a little bit about how I started in this hobby on my BOAT ANCHOR page.
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Other Technical Info Sites:
Current QRN USA Lightning Storm Maps
Some of this site's (W8JI.com) contents are listed below: TKO 600 transmission Shift Problems
SB-221 Tank Voltages and the parasitic oscillation myth. The real explanations behind amplifier parasitic oscillations and alleged damage by HF amplifier parasitic oscillations. Look at voltage throughout the tank at frequencies between 1 and 300MHz, and decide for yourself. Related article at Arcs, what makes an amplifier arc?
Preamplifiers for receiving. Measurements of receiving preamps. Compare your favorite pre-amp (text corrections 4/27/03)
Arcs, what makes an HF amplifier arc? This explains causes of amplifier arcing in any amplifier, including the TL-922 amp, Ameritron amps, Heathkit SB220 amplifier, and any other HF power amplifier for amateur or commercial service. Simple failures and design or operating shortfalls are often explained as parasitic oscillations
Bandswitch failures the real causes and cures of bandswitch arcing and failures in HF power amplifiers that are often attributed to poor parasitic suppression causing oscillation
How to load or tune your HF amplifier and why an amplifier arcs when tuned incorrectly
Inductors deals with antenna loading coils but also applies to amplifiers
Related page: Inductor spice model
Relays how to speed and sequence amplifier T/R relays and how antenna transfer relays affect amplifier failures
Tank Circuits two models showing tank voltages, currents, loss, and phase shift
Vacuum Tubes how they work in RF power amplifiers and why vacuum tubes arc in amplifiers Includes details on 3-500Z and 8877 3CX1500 A7 tubes. Learn reasons tubes fail in amps
Vacuum tubes, how they convert d-c to RF how RF amplifier tubes convert dc to RF power
VHF Parasitics and general stability. Is your amplifier unstable? If you own a TL922, SB220 series, 30L1, or other amps with grid "negative-feedback" you will want to read this! (rev 5PM Feb23/03) Spice models. The resistor think might be non-inductive might not be what you think. Includes internal photos of various resistors.
Diversity reception "diversity" receiving using stereo along with some sound file examples
Receiver Tests of some transceivers and receivers. Newly added 756PRO FT1000 MK V Kenwood TS870 (modified)
Receiver IM improvement mods for FT1000 FT1000D
DX Sound files: What some signals sound like here
1000MP MK V....mods for FT1000MKV receiver IM and transmitter clicks
Includes sound files of signals with excessive bandwidth, a technical description of what causes clicks, and mods for the FT1000(D) and FT1000MP.
What Causes Clicks....The technical cause and what we can do about clicks.
Keyclick-MP.... An analysis and patch for the FT1000MP 's infamous key clicks
Keyclicks 1000D.... An easy and cheap patch for the FT1000 and FT1000D
Keyclicks 1000MP MK V....mods for FT1000MKV receiver IM and transmitter clicks
Also see Radios.
Technical article about noise and receiving/ receiving antennas
Power Stroke Diesel RF Noise: PowerStroke Diesel noise and how I corrected the problem in my 2003 F-250
MFJ-1025/1026 Technical Information
Common-Mode Noise issues with feedlines, and how to avoid problems
MFJ-259B Alignment instructions and some technical information MFJ259B.
MFJ-1025 and 1026 phasing unit technical information.
Barnesville-Lamar County Industrial Development Authority Project Brown Green Power Piedmont Renewable Power Rollcast Energy
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