Loop Antenna Amplifier ++

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Cross Country Wireless Loop Antenna Amplifier ++

The Loop Antenna Amplifier ++ contains all the electronics needed for home DIY construction of an active loop (magnetic loop) low noise receiving antenna.

The amplifier consists of two units, a weatherproofed outdoor head unit for connection to a suitable loop and a bias tee unit to provide DC power up the coaxial cable to the outdoor unit. The head unit can also be used on it's own powered by the internal bias tee inside a SDRPlay receiver.

The outdoor unit is housed in a polycarbonate box with stainless steel antenna connections and a BNC socket. The bias tee unit is a PCB with two BNC connectors and a DC socket to take DC power from a battery or power supply.

Like our other active antenna products it has RF overload protection to allow it to be used very close to transmit antennas without damaging the amplifier or the attached receiver.

The loop depends on what the user has available. We have tested it with simple wire loops or deltas, coax loops and an alloy loop made from a bicycle wheel rim. We supply a 2.5 m (8 ft) length of wire as a simple loop to make a first loop for testing.

The photograph on the right shows the prototype with a 1m diameter loop of LDF4-50 coax cable as a test loop.

The Bias Tee unit is intended for use with a 12 V feed which allows the head unit amplifier to have a greater dynamic range than with the 5 V available from a SDRPlay receiver. The components in the internal bias tee inside a SDRPlay receiver limits the minimum frequency to 500 kHz. Using our bias tee unit allows the antenna amplifier to work over it's full range. This is ideal for fixed station operations with high quality loops and high performance base station receivers or transceivers.

Test loop

Specifications:

CCW End fed Antenna

Loop Antenna Amplifier ++ US/international shipping
Loop Antenna Amplifier ++ with UK shipping

VAT will be added during the PayPal transaction for UK customers.

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Orders for customers from the EU are now processed by eBay so that customers don't have to pay tax and a handling charge on delivery. Click here for the eBay page for this product

If EU customers pay directly in US dollars or GB pounds we cannot process the EU tax and you will have to pay the tax and handling charge on delivery.

The Loop Antenna Amplifier ++ is also available from our authorised reseller SDR-Kits.

Bias tee

An early version of the Loop Antenna Amplifier was reviewed in the March and April 2020 issues of Radio User magazine.
Here is a link to the review web page.


Here's a video of the prototype of the Loop Antenna Amplifier in use with a loop made out of a 700C bicycle wheel rim. The video is made during a field test in a very quiet rural environment. Watch the volume control during the early few seconds of the video due to wind noise on the camera phone used. It clears up later.

Contact Chris Moulding via info@crosscountrywireless.net


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