The antenna isolator shown on the web page is one I've designed for use with isolated loop counterpoises. I recently wrote an article on loop counterpoises showing how isolating them almost eliminates

Hi Ray, As you have found the minimum voltage for the Loop Antenna Amplifier + is just below 5 V. The USB voltage output from some computers may be lower than 5 V and in that case an external USB hub

It sounds like it's working well for you, Mike! For others on the forum what are the details of the loop you use with the amplifier? Regards, Chris

We stopped manufacturing the Broadband Active Antenna at the start of the Covid-19 lockdown. During the lockdown I took the opportunity to re-design the antenna so that it will work directly from a 5V

The later versions of the original Broadband Active Antenna had common mode chokes on the coax feed inside the antenna to stop RF noise from the coax cable reaching the amplifier in the antenna. To ge

https://youtu.be/Xv_JtaoYD0A This link should work. Regards, Chris

https://youtu.be/Xv_JtaoYD0A Here is the link to the YouTube video. Regards, Chris

Mike Ladd, KD2KOG who is tech support for SDRPlay has just posted a video showing his loop antenna using a Loop Antenna Amplifier + from his home in Florida. It looks like it's working well for him, t

That's normal procedure with HDSDR and CFGSR. You are back to the original problem. It appears that your computer is seeing the USB sound card in the SDR-4 as a mono card even though the advanced soun

The libusb-Win32 driver is used by many USB devices. It looks like Windows 10 has identified it as being used with another USB device. This driver is used by the SDR-4 receiver to send frequency contr

Hi Ian, Everything looks OK with the settings. I'd try changing the soundcard settings in the Microphone Properties and change them back just to check that any changes are being reported correctly. Up

If you are using a thicker loop it is possible to connect it to the amplifier with short wires without affecting the performance too much. On the 1m loop of LDF-450A coax feeder I use as a test loop I

Thanks for sending the screen shots, that helps. There is obviously a difference in level between the antennas of 10 to 15 dB on 7.3 MHz. On the MLA-30 it shows several extra signals that have no trac

Hi Eric, One point to watch with the MLA-30 is that it does pick up a lot of signal on the coax feeder. This tends to make the nulls from the loop hard to find. With a loop using the Loop Antenna Ampl

Hi Eric, In order to answer your question I need a bit more information. In what way is the performance lacking? Is it lower in level, lower signal to noise, extra noises , overloading the receiver or

Hi Randall, It's hard to say what the problem is. I stopped supporting APRS Messenger some while back as I wrote it in Visual Basic 6 and it's not possible to load a fully working version of VB6 onto

Hi Eric, We have good stocks of the Loop Antenna Amplifier ready to ship. We try to keep the stocks up in case we are affected by additional lockdowns. From what we can tell shipping to the US is almo

Hi Gordon, Sorry to hear about your brush with officialdom. I have a relative who lives in a retirement flat and it's the same for her. Anything out of the ordinary or not easily understood is not tol

With small (< 0.2 wavelength) aperiodic loops the efficiency increases when the inductance is reduced. This is why for 1 turn loops constructors go for copper or aluminium tube rather than wire. Incre

It depends on the RF frequency received by the loop. At LF and HF where the diameter of the loop is less than 0.2 wavelengths it works as you describe where the null point is where you look through th