Les, A few questions to fault find: What loop are you using with the Loop Antenna Amplifier? Have you tried the 3m wire that came with the amplifier as a loop? Have you confirmed that your coax cables

In the Loop Antenna Amplifier base unit D1 and D2 act as a diode limiter on the output. It's there to limit the output when used with SDRPlay and similar receivers that don't have input overload prote

The signal levels on the FM band in Tokyo must be very high. The VLF/HF unit had two low pass filters built into the head amplifier. One used capacitors across the common mode choke which filtered the

From what you describe at VHF, Hisao, it looks like it's overload of the receiver. Using the higher supply voltage improves the amplifier IP2 and IP3 performance as you proved on the medium wave test

Thanks for posting your results with different supply voltages. It's worth noting that you are giving it a severe test as the signal levels in the medium wave broadcast band are extremely high in Toky

Les, We have the Loop Antenna Amplifier + back in stock today ready to ship. As Hisao says the head unit will work as you suggest with the SDRPlay receiver. The Bias T is a unit that supplies DC volta

We made the first batch of High Z Antenna Amplifiers just before the Covid-19 lockdown. I posted the web page because a customer needed some details on it and we have sold a few already sending an ema

Hi Paul, I've got the email. As you've sent a technical question with three detailed screenshots I want to take some time to study it when I've finished in the workshop later today. I try to respond t

PM sent. Regards, Chris

It depends on the software. PowerSDR could be used with the Griffin controller and I recall that other software could be used with MIDI controllers. There was one version that could be used with a DJ

I've removed both spam posts from the forum so later readers may wonder what we are talking about. The forum account for supplier of the spam posts has been put under moderation. Any future posts that

Les, The Loop Antenna Amplifier + head unit can be used directly with a SDRPlay receiver or with a base unit or a bias-tee board. If you use the head unit with a SDRPlay receiver using it's internal 4

Most of the portable radios are designed for high sensitivity with a telescopic whip rather than good overload performance with a large antenna. It's possible that the extra gain in the base unit has

Yes it can be powered with an earlier base unit amplifier but it would restrict the frequency response at VHF. For the best results in terms of sensitivity and overload performance it's best fed with

Hi Babis, I'll send you a personal email with my home address to ship it back to. Regards, Chris

Rob, If you are not happy with your amplifier please return it and I'll send you your money back. Regards, Chris

OK that's a fair comment. I've added the four loop version to my job list! If it works like you say I'll make a video. Regards, Chris

Which version of the Loop Antenna Amplifier have you got? If it's the original one did you fit the upgrade kit? The video shows the one from the first batch that had a UHF oscillation problem. Regards

I've sent a PM as your order was shipped last week but I'll update others with the situation. During the Covid-19 lockdown we have an arrangement with the local postmaster that we drop our batch of pa

Just before the Covid-19 lockdown we built a large batch of HF/VHF/UHF Multicouplers so that we could avoid having to go to the workshop during the peak of the virus. As the lockdown has eased slightl