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Hi Martin, We are talking about the small excitation loop that is interfaced to CH0 port of VNA. Yes, you are correct the current limiting resistor will be 50-56 Ohms for the specified upper

Hi Raphael. OK, so this applies to the excitation of the reception loop, by means of a smaller source loop. Are we talking about the inductance of the reception loop, or the excitation loop, I

Martin, Mike and Chin-Leong I analyzed again any suitable test networks for measurement of S21 for *active small loop antenna* ( not just antenna amplifier ). Martin used coupled loop antennas in the

Still not working Try /g/loopantennas/photo/267767/3805545

Try /g/loopantennas/photo/267767/3805545 ( /g/loopantennas/photo/267767 )

My circuit is intended to simulate a loop with a loosely coupled 50 Ohm port. All the following plots are taken from the "loop" side of the simulator, with the 50 ohm port terminated in 50

Biastee, 1. The values of inductances are L1=L2=La/2 and C=Ca based on S11 measurements for a particular loop antenna. So, the dummy circuit is a simple Pi- attenuator balanced with 50 ohm resistor

Basically you are using a simple jig consisting of RF isolation transformer and voltage dividers 24/0.5 ohm. My idea has been different based on a standard using a dummy antenna circuit recommended

Hi Sigi Don’t get angry, messages can lead to misunderstandings, ie I didn’t know 80m etc.. I agree vertically oriented shorter dipoles work well. Assuming not too short which yours are not. I

Yes. I am having problems visualizing the above circuit. Can you kindly post a circuit diagram? As the inductance (L1-2=700 nH) and capacitance values also significantly differ from LZ1AQ's and

For my loop preamp measurements, I use a jig between the VNA and the preamp, shown here: - unbalanced to balanced transformer is now different, on T50-6 core, quadrifillar wound. Primary is 10+10T

The following photos have been uploaded to the 9W2LC's LZ1AQ amp ( /g/loopantennas/album?id=296366 ) photo album of the [email protected] group. * gra_sim gain @ L1.jpg (

The following photos have been uploaded to the 9W2LC's LZ1AQ amp ( /g/loopantennas/album?id=296366 ) photo album of the [email protected] group. * cct_model.jpg (

Hi Martin, Did you weigh the dummy circuit that I recommended besides using coupled loops in near field that you favour? Raphael Sent: Saturday, July 13, 2024 6:46 PM To:

Hi Raphael, I quickly tried Biastee's circuit, but it didn't work out too well for me. I still favour my version, which gives results that are close to an actual loop, but perhaps still not close

Photos only allows certain format files. I know of no such limits on the Files area. -- Steve Greenfield AE7HD

Hi Martin, Also I noticed that schematic diagram of Biastee's having presented the loop antenna as a dummy load in order to run S21 test with VNA. In my opinion, the layout should be changed

ahh no pictures as attachment ... grrrr Am 13.07.2024 um 18:34 schrieb Siegfried Jackstien:

Steve, Allow Files area to upload **.s1p* touchstone file format ? Raphael

my 80m verson is 17m high (15m long with about 2m off ground) ... where did i say its fullsize?? its a bit smaller as a quarterwave without cooking worms (almost like an inverted groundplane) ... at