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Hi Mike, Ah OK, that clarifies several things. I think that it is important to include that information in more detail along with your design. Your design decisions then make a lot more sense when

Hi Martin, I agree, the input capacitor of 1nF is too much in most cases. I used this value with cross-parallel loops 0.7m diameter each, copper foil conductor on kids hula-hoops. The combined

Hi Bob, I'm pleased to hear that you found my notes of interest, however the credit should really go to Owen Duffy. https://owenduffy.net/blog/ Who was the person who originally inspired a lot of

Hello Martin:<Off topic, but kind'a relevant.> Your reference to G8JNJ's article is appreciated in a timely manor. Due to its clear and basic explanation, I will probably include it in our Level-1

Hi Mike, A good project. I'm a bit concerned about the value of the input capacitors which are shown as being 1nF, with a comment to reduce them to 100pF if there are no strong FM stations

https://oshwlab.com/3ym3ym/af7kr-loop-preamp-v2 I already had schematic in my Files area, now the PCB layout is available. Licensed under Creative Commons, feel free to use as you wish (don't forget

Alan, Thanks for the time you spent on your extensive write up. Much appreciated. To answer your questions/advices : 1. There is a steel reinforced concrete floor between the Baby Loop and the

Not so much a propagation concern as keeping the near fields away from people. The voltage on the tuning capacitor will be of the order of many kilovolts? with a current of >10 Amps at around the

I not put anything near the loop. I would only build something below the loop. A platform of 1.5 high where the 2 meter pool is standing on. And then the loop will sit on the pool. The loop will then

Steve, Thanks for your long response. On the rain. Yes I was reading about this. The manufacturer even recently modified one model by adding a cover on top of the capacitor because rain got too much

I am putting in on my own part of the roof. That is a penthouse. Nobody has access to it unless on purpose my neighbour climes over the wall which separate his and my appartment. And it is to top of a

And definitely don't located in a place where people can touch it. The voltages on any transmitting loop can be astronomical and possibly lethal. As a teen I put up a loop on the back porch. My mom

You may better understand things from my perspective, if you take a look towards the bottom of this webpage. https://g8jnj.net/broadbandhfvertical.htm Regards, Martin

The other problem in the UK (and the USA too) is trying to comply with OFCOM RF exposure limits, which is especially problematic with efficient tuned loop antennas. Folks usually can get away with

Well said Martin. I am not a designer or manufacturer, but a consumer. I have built my own loops but not the amplifiers and have two CCW LAA amps. I agree wholeheartedly with what you have

Personally I still wouldn't buy one from them for all sorts of reasons, some technical and some ethical. Chavdar, LZ1AQ, was good enough to openly publish his design and related information free of

Hi Frans, Although I do not own a Baby Loop (price outside my budget), nor am I an expert, your questions were the same as mine when I was looking at the Cirro Mazzoni products. I wrote to Cirro,

I would think any material you add near the loop makes things worse. My understanding of the manual is that the loop should be 1.5m away from other objects. 73, Mike AF7KR

If you look very closely at the picture of the PCB in their ad, you can clearly see that the circuit has now been changed to an LZ1AQ version. I guess after Steve's poor review of the original, they

I have to reply on this - the unit looks nice, but I have to also agree that for $525USD, you can get a LOT of loop with more flexibility. I am currently using the Wellbrook ALA-100LN-M. This unit is