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You may have something there, Kobus. I wondered if the AGC operating back in the IF stages would limit things such that an S-meter reading audio level would always drop back to something lower,

J, What you are measuring is the voltage needed to bias the RF input MOSFETs to keep a given signal at the audio volume control.? This will vary with signal strength so that an S9+10 signal should

Just a thought. The audio level is tapped off from the output of the agc board. Meaning that the agc will be attuniating a signal over S9 therefore it tops off at S9. If you want to read the real

Justin, If you have a Nextion display, have you tried monitoring the ADC as Ian (KD8CEC) does in this blog: http://www.hamskey.com/2018/07/capacitor-selection-and-application-of.html It might give you

Jerry and Curt, Like Jerry, my main reason for pursuing the 40meter CW dip is to understand the root cause.? I do not really use CW, so it is not that I want to operate in that mode so fixing it with

Curt, Ah, good. You have a v3 or v4. Was thinking you had a v5 or v6. And that there might be an issue with current rigs not meeting regulations. So at this point, there is nothing I am especially

Jerry On my v4 all harmonics are clean, thanks to installing one of Gordon's relay boards.? But as with many v3 and v4 I have those fixed frequency leakage spurs in the vicinity of 12 meters.

Curt, Agreed, if rig is compliant on all bands and modes with the increased gain at Q90, it's a good fix. But Evan's scope traces at TP1 for 40m vs 30m and 80m make me?curious as to exactly what's

Vic - I have the same results with your cal values as I did mine - they were pretty close except for last two.? I guess maybe this is what we have unless a different sensor is used like Ian's sensor

Jerry Thanks for finding my info related to a 40m dip and remedy with a capacitor value change. We did a local group build of v4, and out of about 2 dozen units only 2 reported this issue that occurs

Mike I used an LM2596 dc to dc converter to drop the 13.8 vdc from P1 to 5vdc It’s rated to 3a. I use it to feed my TDA 2030a audio amp, my SSM 2167 mic preamp/compressor and theRaduino ?board. I

Bitx40's Sold pending funds Foxx-3 Still for grabs

I'll finish off the move to this new thread by copying over news of the C81 fix from Curt: From post 87380: Looks like Curt added 330pf across C81 and got good results:

Hi, I calibrated it, played with the values and have same challenge - Meter will not go over 9. Not sure if it is the sw or the Nextion file. -- Zvika 4Z1ZV

Jerry, First, thank you for porting the conversation to a new thread/hashtag.? The only clarification is that I also have seen the CW power reduced on my v5 ?BITX.? So I personally have experience

Looks like Curt added 330pf across C81 and got good results: /g/BITX20/message/84646 /g/BITX20/topic/70906819#80608 I'm very curious what TP1 looks like after this

Jerry and Evan Hashtags are not really necessary. Common thinking is that they help to aggregate common content, but in this case it probably does not matter. Hashtags – Groups.io Help Center

Curt, What "equalizer network". Is that in the emitter leg of Q90? Can you give a pointer to your post? But why does his scope trace show TP1 to be so ugly? Jerry, KE7ER

Evan, I totally ignore hashtags, didn't even notice they were present. Go ahead and edit my new thread name at will. I've dug out my v3, will see if it exhibits the same problem. Primary task here

Evan I am thinking it may be the equalizer network, but surprised you would see it on all 4 units. On mine a capacitor adjustment cured it, I was searching in all the wrong places. I had a pronounced