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What is a magnetic loop antenna?
 
Child and Radio 1925              Franz Fiedler (1885-1956)    

I will try to explain in few words how works the small magnetic loop antenna.

1) The magnetic loop antenna is a RF transformer. The primary is the small inner loop that has 1/5 of the size of the main loop.
The secondary is the outer conductor loop closed by the variable tuning capacitor that irradiates the radio frequency energy. Remember that there is no electrical contact between the inner excited loop and the outer loop.

2) The magnetic loop antenna is a high “Q” device. The band width is very narrow and the user needs to retune the antenna at minors frequency changing for the best receiving gain and the lowest SWR in transmit.

3) The magnetic loop works like a front end tuned filter circuit helping to improve the adjacent channels rejection.

4) The magnetic loop antenna can be used on the vertical plane or on horizontal plane.
In outdoor radio activities we use the loop on the vertical position, supported by a small pole. The antenna can be turned freely in both directions to minimize or even kill man made noises.
On the vertical position the loop presents a horizontal “8” shape radiation pattern similar to the dipoles.
On condo windows and hotel balconies we use the loop on the horizontal position. On this case the small magnetic loop presents an omni directional pattern. In other words the irradiation will be like a vertical antenna.

5) The small magnetic loop works perfectly at low heights. A one meter diameter loop works perfectly one meter above the soil.

6) The small magnetic loop doesn’t need counterpoises.

Historical references in portable magnetic loop antennas

     
          Balkan’s War in 1942                     Alder-shot England, November 1937

AlexLoop SML 7-30 Magnetic Loop Antenna by PY1AHD

The AlexLoop SML 7-30 small magnetic loop antenna was designed by PY1AHD over seven years of researches and constant improvements.
The field tests confirmed more than 800 QRP DXs and a distance world record registered on the Hall of Fame of the HF Pack group:
http://hfpack.com/hall/


AlexLoop SML 7-30 Small Magnetic Loop Antenna Features

Tune in 5 seconds any frequency comprehended
between 6.95 MHz to 29.7 MHz
  • You only need to adjust the built in tuner to peak the signal in receive and then fine tune in transmit for the lowest SWR.

QSY from a band to another band just on a pair of seconds
  • Change the band by turning a button - there is nothing so quick and so easy.
  • No taps on coils for band changing and no whip adjustments to fine tune.
  • All those features with the incredible freedom of a no counterpoise antenna.
The Ultimate Solution for Antenna Restricted Hams


Window Mounted AlexLoop SML 7-30 Magnetic Loop Antenna
  • The unique low profile solution for antenna restricted hams and short wave listeners.
  • You can use the AleXLoop SML 7-30 antenna supported on windows, balconies or even inside your radio shacks.
  • A discrete antenna that can be used and tacked off from the window or balcony with the finished radio section.
  • The perfect companion for the traveling ham that can easily carry the antenna to be on the air anyplace where he goes.


AlexLoop SML 7-30 Portable Operation


Enjoy the best from HF pedestrian mobile operation

 

Follow this simple steps for HF plug and play operation

1) Leave the Velcro that accommodates the cable to the antenna.
2) Connect the cable to the RF output and turn on the transceiver.
3) Hold the antenna and tune with your thumb.

There is no other HF portable antenna as efficient as the
AlexLoop SML 7-30 considering its small size and weight.


Buy now the AlexLoop SML 7-30 small magnetic loop antenna kit.

 
  1. We send the antenna kits to anyplace covered by EMS postal service.
  2. We are accepting quantity antenna orders by Ham radio stores and Ham radio distribuitors.
  3. Quantity buyers will receive the AlexLoop SML 7-30 Ultra Light antenna version factory assembled and ready to work out of the cartoon box.

For commercial details contact directly: py1ahd@ig.com.br



PY1AHD ALEX