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.

We make three versions of our Loop Antenna Amplifier ++.

The standard version is the V4. We use this version in our HF Active Loop Antenna v4.
This now has a frequency range of 90 kHz to 55 MHz and is recommended for long wave, medium wave and HF use.
Amplifiers built before June 2024 had a frequency range of 500 kHz to 55 MHz.

The unfiltered version has a frequency range of 50 kHz to 150 MHz.

The NYLA HF only version has excellent high pass and low pass filtering for HF use only.
The frequency range is 1.8 MHz to 55 MHz.
This version is recommended for extreme situations usually in large cities in the USA where very strong AM and VHF FM broadcast signals overload HF receivers.

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.


We use eBay for our individual customers as they look after the import tax and fees involved in international transactions.

The eBay listing is here.

As standard we supply the V4 option. Pleased add a note or send an email if you require the unfiltered or NYLA HF only version.

If the eBay listing is sold out we have a regular stock situation post on the Cross Country Wireless Groups.IO forum..
We also announce new batches of our products on the Groups.IO forum.

For our professional and commercial customers we now have a Wise.com account so we can accept bank transfers in local currencies worldwide.

Contact us for a quotation.

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

An early version of the Loop Antenna Amplifier was reviewed in the March and April 2020 issues of Radio User magazine.
Here is a ink 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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