Chameleon has announced a small transmitting loop, the Chameleon CHA M-LOOP. Continue reading Chameleon CHA M-LOOP
Category: Small Transmitting Loops
Thermograph of small transmitting loop
Martin Ehrenfried (G8JNJ) conducted some interesting experiments on a small transmitting loop.
The loop above is 3.45m perimeter of LDF4-50A Heliax, and uses the full length of the Heliax as a stub for tuning the loop to 5MHz. Continue reading Thermograph of small transmitting loop
Ground effects on KP4MD’s 0.9m loop on 28MHz
This article explores the radiation efficiency of KP4MD’s (Milazzo 2012) small transmitting loop (STL) using a set of NEC-4 models of the loop at varying heights above ‘average’ ground. Continue reading Ground effects on KP4MD’s 0.9m loop on 28MHz
Small transmitting loop EMR safety – EMR Calc predictions
I thought it interesting to compare EMR calc with NEC-4 on my lossless octagonal loop (top tuned), 1m across on 40m in free space radiating 1W. Continue reading Small transmitting loop EMR safety – EMR Calc predictions
Ground effects on small transmitting loop efficiency
This article explores the radiation efficiency of a small transmitting loop (STL) using a set of NEC-4 models of a 3.14m perimeter loop on 7MHz at varying heights above ‘average’ ground. Continue reading Ground effects on small transmitting loop efficiency
Small transmitting loops and EMR safety
Small transmitting loops (STL) are often recommended for use inside buildings, on balconies and even hand held, but are they EMR safe?
Continue reading Small transmitting loops and EMR safety
Equivalent circuit of small transmitting loop with auxiliary loop feed
A common method of feeding a small transmitting loop is to use a small auxiliary input loop. This is sometimes referred to as the “Faraday feed”, implying a shielded feed loop though many so-called shielded loops are not effective (Duffy 2007), but the loop does not need to be shielded nor does there need to be a metallic connection to the main loop.
This article looks at an equivalent circuit. Continue reading Equivalent circuit of small transmitting loop with auxiliary loop feed
Small transmitting loop – gamma match
One of the feed arrangements used for small transmitting loops (STL) is the so-called gamma match, though it is questionable if these are quite the same as matches of the same name on a linear dipole. Continue reading Small transmitting loop – gamma match
Small transmitting loop – linear circuit analysis
This article describes a linear circuit model for a small transmitting loop with auxiliary loop feed. Continue reading Small transmitting loop – linear circuit analysis
Small transmitting loop – NEC-4 analysis
This article describes a NEC-4 model for a small transmitting loop with auxiliary loop feed. Continue reading Small transmitting loop – NEC-4 analysis