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There are lots of fakes and poor performing clones out there, I bought mine directly from the approved Zeenko store on AliExpress. But other dealers include Mirfield Electronics in the UK, but not

Simon, I understand there are lots of cheaper copies of NanoVNAs which are not genuine and inferior mechanically and technically. Perhaps others here can advise the best sources, but you have to be

I dont believe that faradays law (which can be used to explain the voltage induced in a small constant current loop) distinguishes between a horizontal and a vertical part of the loop conductor.

Steve, Yes, I'd like to do this comparison when I have time. Finally a reason to use 2SC5551's that you sent me a while ago :) Martin, This preamp is a 50 Ohm in/out Norton push-pull, the only

It looks similar to the Wellbrook loop amplifier itself, but I think some time ago, it was decided that this wasn't actually a Norton Amplifier, but it embodied another form of

Ah, that's where I'm totally out of my depth, JohnT. (I meant the vector cross product of H with any horizontal conductor.) Just don't understand how a horizontally varying H vector can induce any

Mike, Since you told us you have an IMD test set, maybe you should build the two types and measure them, using same transistors and same current, and let us know the results.??? :) Steve

I wonder how this 2-transformer circuit compares to Lankford 4-transformer design in terms of IMD. I would expect even better OIP2, because of the symmetry of the output transformer 73, Mike AF7KR

Hi Simon, I think it depends upon what you are most likely to use it for, and how careful (or careless) you tend to be with kit. Most of my applications are indoors, but I have used it up a tower

Hi All Thanks for inputs.. As it happens..( abit of back ground info here first. I am electrical and electronic engineer on 3 ferries very near Plymouth, also have a very good mechanical

Andrew Ikin of Wellbrook for a short time offered a version of the ALA1530LN with an additional 9 dB gain Norton preamp in the receiver coupler--this version was called the ALA1530LNP. He developed

I have that, too. The numbers achieved with that setup were slightly worse, especially F1+F2 OIP2 (+90dBm). To be honest, I didn't buffer the oscillators that well, the max levels at the DUT input are

Paul, I'm not clear as to the meaning of your term "... H cross horizontal is still zero", please explain. However, since a loop that is electrically-balanced to ground does not produce a response

The terminology and menu structure of the NANOs emulates the VNAs offered by the"big boys" . I've used these for decades and find the NANOs very easy and quite friendly to use. Consequently, the

Hi John, I agreed, we all have own personal favourites for various reasons, a lot depends upon our pattern of use. Personally, I tend to find that I'm using my LiteVNA 64 and TinySA Ultra for more

Martin, All agreed and very true, but Simon was enquiring about an inexpensive antenna analyser rather than test bench device using NanoVNA Saver software etc.. The now obsolete devices have various

Would it be not less effort to use two well buffered X-tal Oscillators instead of an Si5351 followed by two x-tal filters? I do it this way with a RF-2-tone generator proposed by DC4KU and are able to

Good morning and thanks, JohnT :) Would it be right to understand the source of that imbalance would be from the E component, as H cross horizontal is still zero? @Martin, day-dreaming eats up too

Hi John, That is assuming you are in the correct plane WRT the incident wave, and you will also have a reduction in the amplitude component, which I speculate will be -3dB when the offset is at 45

Good evening Paul, Seems to me that if you were to "tilt" your square loop such that the upper horizontal leg were closer to the signal source and the lower leg were further away from the source, a