ML-40HP - High Power Portable Loop Antenna
The ML-40HP mag loop antenna will handle 100 watts, weighs only 1.2kgs, tunes 40m thru 20m and is fully portable.
The QRP Mag-loop antennas use a ferrite ring inductance loading unit. This was found not to be suitable for the higher power antenna thus the new ML-40HP uses gamma match loading.
The tuning of the ML-40HP is very critical so a tuning LED has been incorporated into the new design. When the LED lights the antenna is resonant on the transmitted frequency with a 1.5:1 or better SWR. The LED will not light if the SWR is higher than 2:1.
Like the QRP antennas the High power model does not need an ATU, counterpoise or ground.
Order the new ML-40HP online now.
ML-40HP knocked down and ML40-HP tuning unit
ML40HP QR0 Portable Stn and Gamma Load Connection
Download the ML-40HP Assembly Instructions
Specifications
These are theoretical specifications based on computer modelling. I do not claim that the ML-40HP will perform to these specifications. The design was based on these calculations, however, in practice the antenna may perform better or worse than indicated by the calculations.
ML-40HP |
Loop Calculations |
|
|
Description |
40m |
30m |
20m |
Loop diameter(m) |
1.275 |
1.275 |
1.275 |
Conductor length(m) |
4.006 |
4.006 |
4.006 |
Conductor diameter(mm) |
15 |
15 |
15 |
Frequency(MHz) |
7.05 |
12.20 |
14.20 |
Power(W) |
100 |
100 |
100 |
Efficiency% |
20.89 |
64.29 |
75.39 |
Efficiency dB |
-6.80 |
-1.92 |
-1.23 |
Bandwidth kHz |
6.57 |
19.14 |
29.96 |
Read Reviews of G4TPH Mag-loop Antennas:
Practical Wireless Magazine - February 2008