That should be fine!

Steve G3TXQ

Thanks Steve. I've not got a great lot of experience of building stuff. I wanted to get the main circuit working before looking at sending power up the coax. Hopefully my wire will arrive in the post tomorrow.

Steve could I use this as a double loop to cover the nulls so that I do not need to rotate the loop?
Would this active antenna outperform a discone for my wideband receiving purposes?

I would've thought the whole point of having one was to take advantage of the nulls, make them work for you.

I found that much of the loop's advantage comes from having the nulls - you can notch out local noise sources!

They really come into their own on MF and lower HF frequencies - say up to 7MHz. Above that, this one began to lose sensitivity.

Steve G3TXQ

I have no major noise issues and was trying to create an omnidirectional pattern upon receive.
Thanks for the comments and I will eventually build an antenna for the purpose I require, I am just trying to test the water and gain more of an informed decision before embarking upon the build.

Looking at the circuit diagram from the link on the first page of this post. What does C6 do? Also what kind of capacitors are the green ones that are shown in the link below?

http://www.qsl.net/m0ayf/active-loop-re ... tenna.html

If you take a look at the close-up photo of my amplifier you'll see that C6 is not included

The purist might argue that, in addition to the HF decoupling provided by C1 (100nF) and the LF decoupling provided C7 (100uF), you also need something "in-between".

Those green capacitors just look like axial ceramics.

Steve G3TXQ

I did look at your pictures. I could see the large electrolytic and I thought C6 would have been next to it. It looked you had missed it out.

In a past life I remember spending what seemed like an age explaining to someone, whose qualifications should have made explanations unnecessary, why a particular circuit had .001, 10, 100 and 1,000 uF capacitors in parallel.
He'd built the circuit and omitted all but the largest value.
Not surprisingly, it didn't work!

I kept repeating "equivalent circuit" until I was blue in the face.
Eventually it clicked.

He didn't have the advantage of the internet to help him.

Chers

Tony

Apart from the incorrect number of turns. Would it be ok to use one of these just too see if the circuit works. They are 240/43. My 26 gauge wire must be on the slow boat from China.

You don't say what the core size or material is ....... but they will probably work for testing purposes.

Steve G3TXQ

After blowing the RX up on my TS-570 I thought it would be a good idea to fit the dc blocking capacitor. Anyway it's working, I've had my scope on it and there is only milli volts showing and not 12v dc. I thnk its fare to say I have learnt from my mistake.

The supporting pole isn't metal is it?

Cheers, Dave.

No its fibreglass. When I get a couple of minutes it's going away from the house and higher. It doesn't appear to be working to great at the minute.