Mag.Loop Baby 6.6-29.7 MHz with ATU 2

incl. VAT, plus shipping €1,343.70

Available from 30.06.2023


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  • Babyloop - Magnetic loop 6.6-29.7 MHz with ATU 2

The Baby-Loop is a small magnetic loop antenna for short wave. With this antenna you have excellent coverage of all amateur radio bands from 40 to 10m - precisely tunable. The antenna requires very little space - diameter 1 metre, a mounting height of 3m above ground is sufficient.

The loop is made of aluminium. Even the smallest antenna has a 50mm ( 2 inch) diameter of the tubing. Because of the large surface area there is less loss of gain. Both ends are welded on the socket, no screw connections so no contact resistance.

The tuning capacitor on our loops is not a simple variable capacitor but a big variable plate capacitor of aluminium with an air-dielectric. Both plates are also welded directly to the loop and indestructible on high power! The distance between the plates is 14mm (ca. 1/2 inch) on the smallest antenna.

A weather resistant actuator opens or closes the loop and thus tunes the plate capacitor (SWR tuning).

The capacitance can be varied by a motor and can be adjusted to the best SWR via a control unit in your shack. In spite of their compact size, the antennas are resonant in a wide frequency-range - do you know of any antenna which has a diameter of just one meter (ca. 38 inch) but a frequency range of 40m ... 10m without gap?? Take this one...

Tuning of the antennas is done with either a manual or an automatic control unit. The control units have a 230V power supply integrated.

Automatic control unit

The automatic control unit has a tuning circuit installed and is operated with a small keyboard: just enter the desired frequency, wait a few seconds for automatic tuning of the antenna and go. No trying, no lost notes on settings, no checking with the SWR meter. The current frequency and SWR is shown on the LC display. Maximum power load is 200W with the automatic control unit! A 230V power supply is included in the control unit.

The tuning of the antenna is done with an automated control unit. This controller is supplied with a 230V power supply. Operation is handled by a small numeric USB keyboard: Enter the desired frequency, wait a moment, ready. The antenna has tuned automatically and is ready to transmit after a short while. No difficult tuning process, no note taking, no complicated search for lowest SWR. The display shows frequency and SWR for immediate check, some LEDs signal the current state of the controller. The max. power load with the automatic controller is 200W! An english manual is included in shipment.

The new version of the controller, which is shipped since spring 2016 contains a RS-232 interface. This interface allows direct frequency control by certain radios. The frequency information is directly transferred from the radio (Icom, Elecraft, Kenwood, Yaesu) to the controller, the antenna tunes automatically to the current frequency. Further an Ethernet interface will be available later as a hardware option.

The new version of the automatic controller is available separately as well and can be used with older models of the manufacturer. To interface an Icom transceiver, an optional level converter is required.

Some pictures show the baby loop with platform & rotor. These are both optional parts, not included.

Technical Data
Product Name Baby
Mono-/Multiband Multiband
Number of Turns 1.0000
Brand Ciro Mazzoni
Supported Bands 40m
Weight 12 kg
Max. Power [W] 250 W
Frequency Range 6.6 - 29.7 MHz
Polarisation Vertical
Antenna Type Omni-directional Antenna
Design of antenna Magn. Loop

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