antentopSince2 July

Antentop is FREE e-magazine devoted to Antennas and Amateur Radio an

Special page devoted to

Current Distribution in the A.L.C.

Custom Search

 ANTENTOP- 03- 2003, # 004 Current Distribution in the A.L.C. Assume that |Iref-in| = |Iref-out| which satisfies Kirchhoff Ifwd-in + Iref-out = net current on left side of the coil Ifwd-out + Iref-in = net current on right side of the coil Ifwd-out lags Ifwd-in by 10 degrees Iref-out lags Iref-in by 10 degrees (Iref-in leads Iref-out) Now let's assume that Ifwd-in and Iref-out are in phase.   So current on the left side of the coil equals Ifwd-in at zero degrees plus Iref-out at zero degrees which is a current maximum point. Ask yourself: Can we have a current maximum point on both sides of the coil? I trust that answer is obvious. Ifwd-out lags Ifwd-in by 10 degrees. Iref-in leads Iref-out by 10 degrees. So current on the right side of the coil equals Ifwd-out at -10 degrees plus Iref-in at +10 degrees, NOT a current maximum point. Therefore, in this example, net current on the left side of the coil cannot possibly be equal to net current on the right side of the coil. 73, Cecil   http://www.qsl.net/w5dxp and summarized by W4JLE: If we feed an antenna at the current point, the current decreases as the voltage increases along the antenna element from feed point to end.. That being said, a coil replacing a segment of an antenna (in order to physically shorten it) will exhibit the same properties (relating to currents) as the segment it replaced. Yuri Blanarovich, P.Eng., M. Sc.   K3BU, VE3BMV, VE1BY, ex P4ØA ex: OK3BU, OK3-5292, FØSY, OK5BU, OM3BU, XJ3BMV, CG3BMV, CY3BMV, VC3BMV, VX3BMV op of: OK3KAG, OK3KGH, OK3KAH, 4U1ITU, XJ3ZZ/1, VE3IBM, CJ3DCB, CG1ZZ, VA1A, VC1A, etc. President TESLA RC: N2EE, NT1E, VA1A, VC1A - member: ARRL, RAC, Aruba IDA, MRC, FRC Photo above was taken at VE1ZZ QTH while operating in CQ WW and WPX contests, where I managed to take world #1 spots on 80 and 160m. http://www.antentop.org/ Page 60

 Lightning Links to Open Book Antenna Theory Helical Antennas Useful Pieces Simple Keys Antenna Practice TV Antennas Propagation QRO HF Tube Amplifiers 136 kHz- Antennas Coaxial cables LDE QRO HF Transistor Amplifiers HF- Antennas Two wire lines Interferences QRP HF- RX Antennas Feeder's Toolkit Filters TVI/RFI QRP PA 50- MHz Antennas HF ATU Homebrew Receivers Radio and Ham History VHF- Antennas ATU for the 6- meters Homebrew Transmitters Old Russian/USSR Radio Equipment UHF -Antennas Antenna Parts Matching Circuit for P.A Amateurs Awards EH- Antennas Antenna Towers QRP Transceivers Free Radio and Electronics e- Books TV Channels and Frequencies Reception of Weather Stations Useful Data FM Radio Channels and Frequencies MagLoop Antennas Home-Brew Technics in Antenna Tools PSU for Amateur Radio from Computer Free Programme and Utility

Just for Fun: