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Hi Joe,

Is there a 5" version available? I just received my 5" Nextion HMI finally.

I am trying a 5" tft file I found now but I am not sure if its the same as yours here.

Bill,

Zero 'beat' is a bit of a misnomer as it's really a matter of listening for nothing rather than listening for something.

To understand, let's review the similarities between hearing SSB and CW:? For SSB, the radio inserts a carrier frequency at exceedingly low value & at dial frequency.? This mixes with the received wideband material and comes out sounding like true radio.? For CW, this weak, injected carrier causes a hetrodyne or difference frequency between the added dial carrier and the on/off switched signal you're trying to receive from the outside world.

Now, recall that if you tube for code at too low an audio freq rather than for the traditional 600 to 800 Hz, you can make it so low as not to hear it at all. You might hear a presence, maybe not. Well, you can also tune in an AM broadcast such as WWV and make it's carrier disappear just like you can make a CW signal fade to nothingness (think: Carrier Wave rather than Continuous Wave for a second).

When you do that to an AM station while using a SSB radio or with CW - that is, make the carrier imperceptable/disappear - that's finding the zero beat.

If you had a different model of radio and could swap RX sidebands, you'd have been able to count the dial increments it takes both ways before you reach a personally-subjective detection of the carrier note again. We can't do that on the ubitx during the procedure BUT we can check it that way afterwards. ? Depending on your hearing, it should be 2 or 3 more clicks at 10Hz resolution on the dial, past the lowest you can hear so try that. Save the setting, then re-cycle radio power. Then try listening to WWV on both sidebands one after the other and center your dial on it. If you are more than 5hz off, then try again and change that highly-subjective zero-beat point until you are satisfied with any remaining yet unavoidable, minor error.

Oh, and as a reminder - that local (radio-produced), weak injected signal that helps pick out SSB and CW is called a Beat Frequency Oscillator....? BFO, for short.

And now you know why the? BFO gets set first, before dial calibration procedure gets done.


73,
Ted
K3RTA

Glad to hear that you found the problem.? I would also suggest the KD8CEC Memory Manager program.? That allows you to easily change any of the parameters including the memory presets and calibration parameters.?

The Link is:


73
Evan
AC9TU

Thank you the hex file was the culprit I installed UBITXV5_CEC_V1.200_NX.HEX
and it works like a charm.

Hi Frank,
Interesting, how do you update the Nextion via serial.
What do you have to do to the Nextion when sending serial streams.

Thanks
Laurence

tnx again ted, yes every day new challenges comes up in our wonderfull hobby ;-)

And it is so great that so much OM work together worldwide to find solutions for this challenges and help each other.

This is one of the reasons why I love amateur radio.

hpe cuagn on air :-)


73,
Frank, DC8FG

Ted,
Thank you for the reply. This is how I have been tuning (steps 1-5) and I did have it pretty good at first but I didn't realize you had to cycle off to set it. The first night I heard someone from Norway like they were sitting next to me. The next morning things were messed up again and I couldn't even pick up WWV. I was all over the dial trying to pick it up and I think I got way out in the weeds. I did download uBitx manager and put everything back were it was supposed be I got it to where I could understand speech again. I do think it could be tuned in better but I still am not sure what the zero beat should sound like. I have watched a bunch of different videos on it but still not really sure. I don't have another HF radio so I can't use the redundant radio idea. I do tune it more by the musical note and it has gotten me close.

I am am new to HF and building radios (uBitx is my first step in). There is a big learning curve on what to listen for, how to best tune and even propagation. I like this group because even though it is for the uBitx I have gleamed a lot of general radio knowledge as well. The people on here are very will to help out. ?

I will try out your suggestions tonight and see if I can get things dialed in a little better and let you know how it goes.

Thanks again for the help

Bill
KE8EYM

Ah, ok, mni tnx for your help!

I found a solution from Ted #67572 and it looks pretty good for me - mni tnx for your work Ted!
I think I should familiarize myself more with the configuration of the firmware ...

By the way:

For me it is a bit cumbersome to feed the display with sd-card when it is mounted. So now I use a USB / Serial-TTL-Converter from DeLock. Data transfer takes much longer than using the SD card, but this time is the right time for a big cup of coffee ;-)

73, Frank

Ted, thanks for posting that bfo calabration. Looks very similar to the old R388 instructions used by myself back in the early '70's. Somewhat tedious but always checked out against primary standards maintained by our second order calibration vans. Their standards were maintained by our Barstow,Ca. Repair & standard's depot.
This always makes me wonder how often we as hams check our "standards” like say a Bird meter or in my case, a TS-352 scraped by Barstow, then repaired by me and converted from BA-31's at 4.5 Volts each to common over-the-counter battery’s for resistance measurement. Back then each item had a cal due date from the next senior shop.
Also, thanks to all of you for getting me back into repair and programming along with the Arduino world introduction,& safety, smt useage, tips about many other thinks like Linux, low power antennas, & QRP operation..

Frank, KJ5WI?

As Ashhar stated above, be sure that you have the correct program for the Nano. The correct version for v5 uBitx is in the "uBITXV5_CEC_V1.122.zip" zip file.? For my v4 boards I used the "HEX1.097.zip" files.? The most recent distribution from Hamskey is the Arduino .ino files that then need to have the correct flags set for uBitx version and display type, complied and down loaded.

I would check that you have the correct Arduino program.

73
Evan
AC9TU

Well the hot regulator is easy. I discovered it when my rig was having issues, and was spooked. It is normal and okay.

Did you have signal before you installed the nextion? Usually folk build the ubitx in stock form, then upgrade it, it could be a bad wiring connection anywhere in the path. The noise kevel should go up on any of the lower bands when plugging in a good antenna.

Make sure rig is not stuck waiting for a command. Unplug power source to start it again.

Curt

Thank you to all that helped with prior problems.
I have the nextion 3.5 working fine.?
I do not know what I did BUT now I have no receive. When tuning I hear faint notching with dial turn matching the freq change.
I get a hum but no signal. The voltage regulator which has no heat sink on the??Raduino is getting very hot to the touch.
Any help would be greatly appreciated.

I've encountered several recent clone?V3.0?Nano's with old bootloader pre-installed.? As Jack said, you can overcome it in the newer IDE.
If you have a USBasp programmer, you can easily flash the newest bootloader onto the Nano via the 6 ICSP pins - I don't even solder them in, rather just insert them attached to the USBasp cable (with 10 pin to 6 pin adapter) and hold them over to make a firm contact for the few seconds it takes to flash the new bootloader.? Ebay has the USBasp+cable+adapter all for a few bucks.

Nigel - G4ZAL

Frank, those files only properly fill the screens up to a 2.8". Anything over that size?was given as a "go forth and figure it out" and needs to be resized. Check the "Files" tab to the left and see if any of the 3.5" tft's work for you.

A marginal ATMega382P swept up off some factory floor might?
have IO cells that are more sensitive to RF than a good chip.??
I suppose.
Such a chip is likely to have some other failure modes that would pop up first.

Anyways, in answer to your question:? No,? I haven't.