What is v1 v2 Ishwarrao K S

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Gerard, After reading your comments, I did a more careful analysis and got out of the millivolt region you can see from the data that the gate turns full on at about 4 volts and the suppression increa

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Evan, I enclosed my sketch in pdf, also the asc file. Right now it's set for .9 volts but you can right click on the SINE directive and change to .5 or .1 Andy

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hello, I read the article on the AGC in Nd6t. The capacitor C4 and R6 corresponds to a constant of recovery time of the AGC. In your case on your first schématic 100K and 47µ (You can modify) The diod

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In Microbitx on cw mode if exceeds morethan 5 words per minute the dot and dash disappeared why anybody give reply Ishwarrao K S VU3MUG

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KM4TRT, Would you please post a screenshot of your simulation schematic? I am trying to work out how to simulate in LTSpice, and cannot get an AC response. I believe that the AC response is needed bec

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Evan, still gives 34.6 mV to 3.8 mV. Gerard, I may build this nd6t. Thanks. but I'd still like to know why Ashar's version is responding the way it is.

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hello, CAG par diode séparée, calcul ? - Technique - Forum Retrotechnique IDENTIFICATION ET UTILISATION D'UN CIRCUIT SELECTIF (pagesperso-orange.fr) Automatic Gain Control (AGC) in Receivers (qsl.net)

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But All the grounds are at the same node?

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Well think of ground as a common reference point, it's literally shorthand for all the points that need to be connected either in ltspice or a real circuit. The virtual signal source needs its ground

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When I lit up the real one on the scope, I put all the grounds together, as I believe that was what W2AEW did in his experiment. His circuit was slightly more elaborate. I think the signal ground is f

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Very curious problem. Are you a PSPICE expert? It has been too many years ago since I played with SPICE but I sort of remember it was not obvious how to provide a signal ground. And the signal ground

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Does it make a difference if you use 1.5kHz? That is the center of the SSB filter of the uBitx. 73 Evan AC9TU

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Evan, 6 Khz

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KM4TRT, What is the frequency that you are using for the analysis? 73 Evan AC9TU

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Hi Gerard, Thx for replying. I tried changing values of both 47u caps to 1u in ltSpice. It didn't change anything. Cap Value Voltage in Voltage out 47u 0.900 mV p/p 34.5 mV p/p 47u 0.100 mV p/p 3.8mV

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Hi, can be lower the capacitor by 47µ On my diagram, it’s only 1µ So, 47µ, it may not have time to empty, so, does not fluctuate with the sound of the voice. This is just a hypothesis cdt

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Gerard, Thanks for the idea. PS inKits is out of these AGC kits. I'm trying to figure out why this other one isnt working Ron, I added a 10k resistor to ground as a load(In LT spice. Still 0.9V in giv

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I think you need to load the output with a resistor in order to have a valid test. What is the volume pot in the Bitx, 10K ? I also think you may be over driving the input. A quick calculation has the

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link of the post BITX20@groups.io | A YO3DAC article to understand how an AGC circuit works and the difference with a VGA circuit!

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