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A better way to improve large-signal handling is to replace the source resistor of the input FET with an active current source. This increases linearity and also reduces the gain loss of the source

Yes i know, but this is comparing apples with oranges. The Ikin Amp is a balanced very low Z Input amplifier for magnetic loops. The current discussion is about Hi-Z impedance change amplifiers for

There is a reference here to Andy Ikin's paralleling of FETs, lowering the noise figure. https://www.shoc.ch/wellbrook.html The antenna uses 8 very high gain JFETs in parallel push-pull with a

Yes parallel JFETs can lower the noise at the signal gain is linear and the noise being random adds as root 2 or 41.4% for each doubling. Eventually the gate capacitance will be an issue. Andrew

I would agree. However, I seem to remember reading that parallelling FET's can improve the overall noise performance, but can't find the reference to quote. It does however reduce the input

I built this circuit and used it for many years. In fact is was my first antenna for NDB DX 10 years ago. I started with 1 FET and experienced some IMD from local AMBCB stations. Then I added 3 more

I doubt, that paralleling FETs in an reactance driven HiZ? application is worth the effort. The noise figure of an Hi-Z FET Amplifier ist primarily dominated by the thermal noise of the Gate bias

The following photos have been updated in the Azi-Loop Self-Supporting Structure for Transportable / DXpedition Use ( /g/loopantennas/album?id=301249 ) photo album of the

The following items have been added to the Files area of the [email protected] group. * /MODIFIED AMRAD PREAMP - 20 MARCH 2025.docx (

/g/loopantennas/files/Modified%20AMRAD%20eProbe%20Antenna.pdf

That will teach me for DL'ing so quickly LOL.....can you post a URL to the corrected document? 73 Gedas, W8BYA EN70JT Light travels faster than sound..... This is why some people appear bright until

I made the corrections that Martin mentioned and I also add the Bias adjustment procedure to the posting and deleted the 2 original postings. ?Everett N4CY

Thanks Martin, I will correct it. Everett Sent from the all new AOL app for iOS

Thanks Dave! Andrea [email protected]> ha scritto:

Hi Everett, Incidentally, note that in your schematic, one of the input diodes, seems to have the wrong polarity. Personally, I'd bias them to ensure decent IMD performance, but maybe you have

Hi Everett, I think if you do this, you will have to spell out that a separate "ground" reference for the antenna and PCB needs to be provided, as the coax performs this function by default in most

Hi Dave, The free versions of IO groups, have limitations on storage. These limitations depend on the T&C's of when the group was established, the older groups have more free storage than younger

So we can not do attachments OR embedded graphics in the body of an email?? A picture is worth 1k words. But I understand the cost when archived in storage. These days, storage is the least

The following items have been added to the Files area of the [email protected] group. * /Modified AMRAD eProbe Antenna.pdf (

Mike, ?I just uploaded it.?Everett N4CY