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I have. I considered including skin effect, but chose to keep the measurements away from that. Of course, that is also frequency dependent and even makes radiation resistance worse - if it could get

Dave, I believe you've neglected skin effect.

Consider: 1) The DC resistance of the loop is constant. It's independent of frequency. That's one of the distinguishing characteristics of pure resistance vs. reactance. 2) The radiation

Consider: 1) The DC resistance of the loop is constant. It's independent of frequency. That's one of the distinguishing characteristics of pure resistance vs. reactance. 2) The radiation

Hi Chavdar, In your response to Lim's question about your proposed "dummy" network setup something is left without an explanation. The conversion from Thevenin equivalent antenna model to Norton's

I freely admit that I am just guessing here, but sometimes it helps to recall that an antenna conductor (all by itself) is a transmission line.? When a loop is open-circuited , there must be

The is the original built as per circuit on line using 2N2222 transistors ? LZ1AQ Loop amplifier, with 2N2222 Transistors. The Orginial LZ1AQ at 13.8VDC @130mA has an IMD of (OIP2) 1 MHz +77.1 dBm, 7

Since I have some time (but I'm interested in Mark's results too). It's not necessary to move the (short-circuit) load repeatedly.....NEC reports the current in each segment.? For that loop I

This is what a LZ1AQ amp is with 2SC5551 transistors. ? ?The Improved LZ1AQ at 13.8VDC @120mA has an IMD of (OIP2) 1 MHz +98.4 dBm, 7 MHz +93.8 dBm. (OIP3) 2 MHz +42.2 dBm, 5 MHz +40.35

Hi Leong, Good work, but the LZ1AQ IOP3 looks far too low. It is quoted as being 1 dB output compression point(9) +19dBm (5.6 V p-p), equal to +125 dB(uV/m) at input Second harmonic OIP2(7) +82dBm

I want to add this post to Martin's MLA-30 thread ( /g/loopantennas/topic/mla_30/34311042 ) , but it is locked. Hence, my starting this new topic. I know the MLA-30+ has been done to

Hi Chavdar, Thanks for the above clarification.? I built my LZ1AQ prototypes with input LP filters after reading your remarks " This (filter) does not impair the amp performance. ?Without ?this

About: Does the Norton measurement setup can be used to measure correctly the frequency response of the antenna factor of an active small loop wideband (low Zinput) amplifier? To Mark AG5RT and Dan

Chavdar, No doubt it follows Faraday's law about induced current. Your effort has been design of? active small loop antenna with a flat frequency response. We have to observe a number of conditions

All, Regarding Dave's question please see the created album titled Short Circuit Current of SMA. Raphael

The following photos have been uploaded to the Short Circuit Current for SMA ( /g/loopantennas/album?id=298140 ) photo album of the [email protected] group. *

Raphael Wasserman <wassermanr46@...> added the photo album Short Circuit Current for SMA ( /g/loopantennas/album?id=298140 ) : Based on Chavdar Levkov's paper "Very Weak

Dave, Probably one of the best VNAs for the money?is the SDR-Kits?VNWA 3SE Automatic 2 Port VNA - N-Connector Version. I own 2 of them and use one almost every day. They have great support and there

Since I and many others are totally unaware of the origins or derivation of that "formula", I believe the best path forward is to start over. Is anyone aware of the origin or derivation of it?

To Raphael, 1. The flat frequency response comes from two conditions ?- e..m.f . rises linearly with frequency (Faraday; this is not mathematiucal trick) ?and inductive Xl raises in the same manner.