Difference between revisions of "Ciro Mazzoni Baby Loop"

Revision as of 23:26, 21 February 2024

Ciro Mazzoni BABY Automatic Magnetic Loop Antenna provides transmit and receive continuous coverage across 6.6 - 29.8 MHz which includes all of the 40 - 10 meter HF amateur radio bands. It is made of aircraft grade aluminum. The tuning capacitor is an air-variable type made of thick aluminum plates. Each set of capacitor plates is welded directly to opposite portions of the top of the loop.

The weather-resistant actuator motor changes the loop diameter, causing it to expand or contract and thus adjusts the integral capacitor for tuning. Resonance is adjusted by a control unit in the shack. Although resonant bandwidth is very small (as with all compact loops) tuning is very smooth and easily accomplished when you change bands or change frequency within the band.

The included ATU 2.0 loop controller allows RS-232 direct-frequency control by certain radios. In rigs with CAT or CI-V output, antenna tuning will automatically track the VFO and band changes. The frequency information is directly transferred from the radio to the controller, and then the antenna tunes automatically to the current frequency.

Manual tuning is also possible using the ATU 2.0 controller’s small numeric USB keyboard. The user will enter the desired frequency, wait a moment, and the loop is tuned. The ATU 2.0 display shows frequency and SWR immediately and LEDs signal the status of the controller. The controller uses a very low-power DDS oscillator to tune the loop so it will tune through an amplifier. It is not necessary to transmit in order to tune.

BABY Loop technical data

• Frequency Range: 6.6 - 29.8 MHz
• SWR: 1.3:1 typical
• Impedance: 50 ohms nominal (gamma matched)
• Maximum Input (PEP and CW): 450 W up to 21 MHz; 1 kW from 22 to 29.8 MHz
• Front/back ratio 6dB
• Front/Side ratio: 25 dB
• Antenna Tube diameter: 1.968 in. (50mm)
• Wind loading: 0.25 square meters (2.70 sq. ft.)
• Wind Survival: 100 mph
• Control cable pair: 20 AWG (or 18-2) up to 65 ft.; 16 AWG (or 14-2) up to 100 ft.; 12 AWG (12-2) over 100 ft.
• Weight: 26.4 lbs. (12 Kg)
• Capacitor Depth: 8.5 in. (0.215m)
• Loop Width: Approx. 40 in. (1.0m)
• Loop Height: 50.5 in. (1.3m) from top of capacitor to loop hinge base
• Overall Height: Approx. total 60 in. (1.5m) from top of capacitor to bottom of included mast bracket
• Mast Bracket Height: 11.5 in. (0.3m)
• Maximum Mast Diameter: 2.362 in. (60mm)
• Minimum Mast Diameter: 1.967 in. (50mm)
• Assembly hardware: Stainless steel

Maximum Input (PEP and CW): 450 W up to 21 MHz; 1 kW from 22 to 29.8 MHz. The ATU 2.0 unit handles 200W max. from transceiver and operates on 24 Vdc at 2A (2.1mm input) from a 120/220 Vac International plug power supply.

The Ciro Mazzoni baby loop mk2 latest version as of 2024.

Review

Having received the antenna and completed initial assembly it should be stated that it seems very well built. This is no flimsy MFJ plastic easily broken ham toy. This antenna looks and feels like a well built commercial or military grade piece of equipment.

To perform testing the antenna will be mounted on a pole 5' off the ground and connected to an Icom IC-7600 transceiver.

Test results will be shared here...

Resources

• eHam.net Ciro Mazzoni Baby Loop Reviews A (for some reason they have 2 sections for the same antenna)
• eHam.net Ciro Mazzoni Baby Loop Reviews B (for some reason they have 2 sections for the same antenna)
• Baby Loop install question on the Ciro Mazzoni Forum
• PDF at DXEngineering Review by AD5X
• Ciro Mazzoni Automatic Magnetic Loop Antenna listed at $2098 as of 2/2024 @ DXEngineering
• Reddit discussion related to Experience with the Baby Loop

There are currently no good youtube reviews or assembly videos at this time. Everything discovered via search was horrible, vertical video, poorly done, and not useful at all.