--

…_. _._

Hey if this is how it has to stay I’m happy with it.  For the last several months I was using the 1.20 cec with the 3.5 nextion and there was some functionality issues, so this is a welcome improvement for me.    

That may be my mess-up.  While resizing some things, a feature or two that I don't use, may have lost itself in error.  I'll revisit the files and resume learning.

Dennis,

Ravi

I am not prepared to repair your simulation fault - but I can provide a clue on the AGC.  it is similar to the hybrid cascode (hycas) introduced by W7ZOI.  see what info you can find online - the article or related into may be there.  if not email me and I will dig for it. 

also the Jackal developers will gladly answer your questions also. 

if you did your own circuit - I would carefully check the front end matching on the input of the IF AGC amplifier.  if it is similar to the hycas, it requires a trimmer capacitor to peak the response. 

73 Curt wb8yyy

Okay, I found it.  You have to turn Setup to “On” first, then you can access the CW Key settings. 

I just changed over to this firmware today and like it. But I noticed there isn’t an option to change the CW keying.  It is in Iambic A and the menu doesn’t have an option to adjust.  Depressing the encoder to get into that menu doesn’t have an option either.

Anyone else notice this? 

Adam

Hi,

Continuing my curiosity on how an AGC works in practise, I tried to
simulate the mentioned AGC circuit using Multisim.

https://groups.io/g/BITX20/files/M0RVI/Multisim/JACK_AL_AGC.ms14

The simulation runs for a few seconds and then comes up with an error message.

The S-Meter output shows the output signal in nV/dbm but it is very
low even if I increase the signal level. What would be the signal
level in uV after 2 stages of amplification, should I be trying to
simulate a complete section before trying to simulate the AGC on its
own?

What I am doing wrong/not reading correctly?

I've also added the first stage of the uBITx as a test, this works
correctly. Both files are in the same folder.

Thank you for your time.

Best 73,
M0RVI
--
I'm here to add more value to the world than I'm using up.

Good day to all,

I have for sale the uBITX v.3 HF SSB/CW transceiver. 3-30MHZ up to 10 watts output. Bought the kit several years ago and just got to building it last year.  Only issue that I have with it is that once completed, it did not power up. Might be something that i did not do properly. Anyway, I have lost interest in it. The boards and screen are mounted in a 3rd party cabinet, looks great. Photos attached
Asking price: $70.00 + shipping

Cheers!

Janusz  ve2zhp

On Sat, Sep 26, 2020 at 07:22 PM, Randy.AB9GO wrote:

My uBitx v6 was posted Friday and it has now left Germany!  That's very fast.  Projected delivery is Thursday.  I think it may beat that estimate unless DHL gets slower once you hit the United States.  

Has anyone needed to pay customs in the United States?

 

randy.ab9go@...

Nope, none of my orders from India incurred additional customs charges.

 

Check out the links on this message:
https://groups.io/g/BITX20/message/67572

73
Evan
AC9TU

Gerard,
The Si5351 does generate square waves.  As the frequency goes up, the square wave tends to round off, that or my scope (100MHz) may be filtering the signal at the 70MHz and 45MHz areas of the transceiver.  Regardless, I too have corrupted sine waves on the other two clocks, the high one almost a sine wave.  This could also be related to how long the signal runs are from the Si5351 to the mixers.

Good luck with the new antenna.  That is the most important area for good operation.
73
Evan
AC9TU

Hello Evan,
Thanks for the measures.
It’s exactly the same signal I’m getting.
On the other hand, the other 2 clocks are perfectly sinusoidal.
So everything is normal for me.
I am waiting to receive a reception antenna that I ordered from Jeff. I would then redo reception tests.
Cdt

Gerard,

You are correct on Q12 collector voltage error in the documentation.  I do not have access to correct that document as it came from someone else.

Here are the two waveforms on either side of R110:


The probe is compensated, so the ripple is from the Si5351.  Of course, the higher Vpp is the side closest to the Si5351 (Raduino).  This was while connected to a dummy load, so there was no audio on the signal.

Hope this helps
73
Evan
AC9TU

Here is something I want to share with the community. I have done quite a bit of work on the standalone S-Meter from KD8CEC.  The functionality Dr. Lee has provided in his firmware is fabulous, and this is my contribution to the effort.  I did this using a V4 board, but I think these changes are version independent - just requires use of KD8CEC firmware.

The Summary is below, full details are in the ReadMe on GitHub at https://github.com/soligen2010/dspmeterv1.  The new version is under i2cmeter2

This started with 2 simple goals in mind, but snowballed into a pretty large revamp and more improvements that I originally intended.  The original intent was:

• Get the CW decode to function (it was not working for me)
• Memory was very constrained - reduce memory usage so future new functionality can be added.

Here are some highlights. See the ReadMe on GitHub for the details.

• CW decode mods - hard to tell degree of improvement, but it now works for me if the signal is not too weak.
• Significant reduction in memory usage
• More accurate frequency display on FFT (Requires a Nextion UI tweak)
• Faster, higher resolution S-Meter (higher resolution Requires a Nextion UI tweak, High resolution is optional)
• Calibratable S-Meter (and circuit for optional signal boost)
• Calibratable Power/SWR Meter
• Fixed several potential stability issues.  I never experienced instability - I corrected things I noticed that might have one day caused an issue.
• Significant code streamlining and reorganization.
• Optional faster Serial speed (requires tweak to Nextion and Ubitx firmware)
• Improved frequency change latency when the FFT is being displayed
• Optional support for using the Hardware serial output port instead of Software serial.

I also included my customized Nextion firmware (3.2" display)

• Tweaks to go with the changes above.
• Added Power and SWR meter screen (graphical)
• Added Power and SWR (numeric) to main screen when transmitting - SWR flashes yellow/red when too high
• Streamlined MEM to VFO screen
  • Frequencies are loaded when the screen opens
  • Selecting a frequency immediately returns to main screen
• I think there may be other tweaks I did some time ago - I don't recall the specifics.

--
Dennis WC8C

that seems to be the same page as where I've got the working file from . Thanks for the info !
--
73's de ON4AIN - Jan

Hello,

Try here

https://ubitx.net/2018/07/16/nextion-3-2-and-3-5-display-firmware/

cdt