Re: Nextion White screen issue
Hi Ricardo,
I re-installed .tft file few times. But no luck.
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Re: Nextion White screen issue
? Try to adjust the backlight or reinstall nextion? software .
? Regards, ? 73? de dv3rwr
Dear All,
I am Dileep VU2DLE. I was uploading KD8CEC Hex file to Raduino and Nextion LCD. It works good for 3min or 4min, then Nextion LCD becomes "white" screen. No response !!!!
"White" screen remains ever, until I restart Nextion LCD again. Pictures attached for your reference.
Let me know how to solve this issue?
Warm Regards and Many 73s
Dileep VU2DLE
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Nextion White screen issue
Dear All,
I am Dileep VU2DLE. I was uploading KD8CEC Hex file to Raduino and Nextion LCD. It works good for 3min or 4min, then Nextion LCD becomes "white" screen. No response !!!!
"White" screen remains ever, until I restart Nextion LCD again. Pictures attached for your reference.
Let me know how to solve this issue?
Warm Regards and Many 73s
Dileep VU2DLE
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Re: Help needed with KD8CEC memory manager
I just got a string of 'receive length...' errors when trying to read the raduino in my uBITX.? I had the raduino in the radio.? Once I removed the raduiono from the radio so that the only connection was the USB cable, comms were fast and I could read from and write to the nano.
Andy, KG5RKP
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On Sat, Nov 24, 2018 at 03:59 PM, <richard_a_morrisey@...> wrote:
Hello - I am also getting error receive length = 1/1027. I have tried almost every possible combination of firmware and MM. I was successful with 1.097beta over the summer, then tried the I2C meter. At one point I lost the ability to communicate via Memory Manager to EEPROM. I use linux ans I am able to upload .hex and use the IDE to read all EEPROM values. For Memory Manager I need to use wine. I've used it successfully in the past this way. I was able to calibrate and save settings etc.
Can someone please help guide me to the best solution.
Thanks,
Rich
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Re: Found one issue was Preamp question
Woody the LM358 is a dual op-amp so did you terminate the unused op-amp? If not then it could be the cause of your distorted output.
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On Nov 28, 2018, at 17:35, Woody < mailme@...> wrote:
More testing... Found something else that I didn't suspect.? Sure
won't help audio quality!!!
Getting significant crossover distortion out of my LM358 audio
amp.?? The 470pf in the feedback loop was to tame the highs a bit.?
Simple circuit, but something isn't right.
Tried several different feedback resistor values to change the
gain.? No help.
Think will rebuild with a trusty 741 OPamp.? Less susceptible to RF
too :)
Woody
1 KHz tone
<gcmbgmajkniiafpg.png>
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Woody
not sure I can blame that MP3 on the receiver circuitry.? sure its not high fidelity but getting close.? let's step back as to what happens ...
first the audio squeezes through that xtal filter.? if you wish to examine it there are audio FFT programs - the old one we used to align the K2 was called spectrogram - I used a freeware version.? place noise into the rig (just QRN from an antenna works) and it will show you the shape and width of the filter.? what comes through this filter is 'steered' by the tuning knob.?
second, that BFO -- it needs to be such that the low end of the audio comes down to around 0 Hz.? I don't know maybe yours is now fine as any small tweak of the tuning knob should now slightly adjust voice quality and not slam into the xtal filter.?
I will admit I run my audio through an external NESCAF audio filter, both on SSB and CW.? This includes a LM386 style IC that may provide more output power.?
I am imagining your hardware may be okay -- I sense only a tiny chance your xtal filter has too little bandwidth -- a batch of xtals might only have a 100 Hz or so variation maybe at 12 MHz, small with respect to the 2 kHz bandwidth target.?
73 Curt
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Yes...
I have a broadband noise source I built to align my K2? filters with the audio spectrum analyzer pgm.? Works great.
OTOH, Still enough garbage on the RX test points that it is hard to tell what is from the noise generator when trying to do a signal trace.
Woody
KZ4AK
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On 11/29/2018 0:37, jim via Groups.Io wrote: Maybe try a wideband noise source on the antenna port ...and an "audio spectrum analyzer software" on your computer ...audio from rcvr to computer mike input
Jim
On Wednesday, November 28, 2018, 10:29:23 AM PST, Woody <mailme@...> wrote:
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Re: Found one issue was Preamp question
Clark,
My conclusion too.? Nearly the same circuit using a 741 is doing a great job.
Woody
KZ4AK
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On 11/29/2018 0:52, Clark Martin wrote: i thinking there might be something wrong with the IC. I¡¯d try a different LM359.
Clark Martin
KK6ISP
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Re: Found one issue was Preamp question
i thinking there might be something wrong with the IC. I¡¯d try a different LM359.
Clark Martin
KK6ISP
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On Nov 28, 2018, at 2:35 PM, Woody <mailme@...> wrote:
More testing... Found something else that I didn't suspect. Sure won't help audio quality!!!
Getting significant crossover distortion out of my LM358 audio amp. The 470pf in the feedback loop was to tame the highs a bit. Simple circuit, but something isn't right.
Tried several different feedback resistor values to change the gain. No help.
Think will rebuild with a trusty 741 OPamp. Less susceptible to RF too :)
Woody
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Maybe try a wideband noise source on the antenna port ...and an "audio spectrum analyzer software" on your computer ...audio from rcvr to computer mike input
Jim
On Wednesday, November 28, 2018, 10:29:23 AM PST, Woody <mailme@...> wrote:
Hi Curt,
Chasing something, just can't find it :(
Have re-aligned countless times, result is always the same.
Have used several signal sources for calibration including WWV, CHU, and
my 20MHz OCXO signal source.? Freq cal seems OK.
The BFO is another matter.? Have used several techniques including
listening to myself transmitting on my Drake TR7, on the air signals,?
zero beating audio (listening to a signal with the TR7 and uBITX at same
time), etc.? The outcome is always the same. The BFO will set to the
point that audio is understandable, but not very good. ? I am beginning
to suspect there is an issue with the crystal filter - ????
At least with my audio mod and the RF preamp, it is usable, if not very
pleasant to listen to.? FWIW, the current BFO setting is 11,997,335.
TNX, Woody - KZ4AK
On 11/28/2018 16:54, Curt via Groups.Io wrote:
> Woody
>
> like some builders I stumbled a bit in getting the wires in the right
> place -- but I am wondering if you may be chasing rabbits. the ubitx
> has been designed with some simplicity in mind, yet the receiver is
> thoughtfully designed.? are you sure your is appropriately aligned??
> its the key step in making this receiver sound really nice.? I have a
> version 4 board - the receive audio is real nice in headphones.? there
> is no 'extra' gain in this receiver - so don't use a piece of wire -
> you need to use a transmit-worthy antenna.? do try different bands.?
> after patiently checking and possibly adjusting BFO - you should be
> copying nice SSB (I confess I could not blindly align my BFO - I
> searched the web for a typical setting, found one, and easily got it
> adjusted).
>
> I would dig a little deeper on this before assuming this nice rig has
> diverse issues.? Looking at the construction approach -- automated
> assembly, testing after assembly - I don't expect many units to have
> issue - yours may be just fine.? my few cents of QRM here.
>
> Curt
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Re: Found one issue was Preamp question
Built a new audio preamp using a 741.?? Wow, sine wave in = sine
wave out !? ;)
Audio still weighted to high side, but sounds pretty decent.? Not
surprising with the LM358 distortion as it was.
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Re: Consider the Bitx40, clean and cheap for 40m
Wayne, before you rush into the? 12/10 with an analogue design? beware BEWARE : the 42IF123 coils used (and most likely clones of same from India) are self resonant at about 20 Mhz.? So you will have to find another variable slug coil for use in the BPFs? and that won't be easy.? You can obviously go for toroidal coils and compression trimmers but that may make the? PCB layout a bit? messy given you will have an existing PCB.? essentially up to? 20m with attention to detail , most? things should work.? Whereas at 30Mhz for an original design ,? you need luck and black magic too.
You have no show of getting a 10 mtr rig? to work without a digitally stabilised VFO of one sort or other - which I am sure you know.? Comment : The boards that Sunil sells assume you are going to rustle up ADE-1s for? SBL-1 mixers from somewhere (they are not in the kits of parts, last time I checked )- those former you can get from Minikits in South Australia at a reasonable price (and he guarantees they are not clones) whereas the latter all have to come from pulls of old PCBs and are rather expensive at that too.?
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Re: Found one issue was Preamp question
More testing... Found something else that I didn't suspect.? Sure
won't help audio quality!!!
Getting significant crossover distortion out of my LM358 audio
amp.?? The 470pf in the feedback loop was to tame the highs a bit.?
Simple circuit, but something isn't right.
Tried several different feedback resistor values to change the
gain.? No help.
Think will rebuild with a trusty 741 OPamp.? Less susceptible to RF
too :)
Woody
1 KHz tone
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OK, just for grins, did a full recal.
Procedure:
Set "Calibration" to zero beat against my 20 MHz high accuracy
(OCXO)
Set BFO by tuning the uBITX and the TR7 to same freq,? fed audio
tone to TR7 and transmitted (into dummy load).
Zero beat the source audio freq (TX via TR7) with RX freq from the
uBITX
...On 20M USB and then on 40M LSB.??
PTT / Power off resets as needed.
With Manager, downloaded the Nano and this is what I got:
It works equally for receiving USB and LSB.? Wonder why the LSB Cal
= 0 ?? Have not bothered with CW.
Received audio is understandable, but still not what I consider
good.?? There is a lot of high freq emphasis.
Attached is a short audio clip of the typical audio.
Still trying!!!? More comments sure welcome.
Woody? KZ4AK
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Just to see, tried BFO = 11,995,655. That was WAY off for my system.
Woody
----
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On 11/28/2018 17:03, Evan Hand wrote: My experience is identical to Curt's, I had issues with the base calibration getting off when I changed Nano devices: the configuration is stored in the device, not the source code.? Going in a setting the configuration to the initial values found in one of the emails on this reflector got me going.
Look at this thread:
/g/BITX20/topic/ubitx_cec_lsb_usb_reversal/20070695?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,20070695
Tom, wb6b, had some starting values in his response that worked for me,
Evan
AC9TU
------------------------------------------------------------------------
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Thanks Evan,? will recheck all.
Woody
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On 11/28/2018 17:03, Evan Hand wrote: My experience is identical to Curt's, I had issues with the base calibration getting off when I changed Nano devices: the configuration is stored in the device, not the source code.? Going in a setting the configuration to the initial values found in one of the emails on this reflector got me going.
Look at this thread:
/g/BITX20/topic/ubitx_cec_lsb_usb_reversal/20070695?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,20070695
Tom, wb6b, had some starting values in his response that worked for me,
Evan
AC9TU
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Re: Consider the Bitx40, clean and cheap for 40m
?I forgot to add, I am thinking of maybe a 12/10 meter rig.
?The bandpass filters will be my biggest hassles for that, and deciding which IF frequency to use.
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Re: Consider the Bitx40, clean and cheap for 40m
?I'm still here.
?I have 2 of Farhans BITX40's, one from just before the raduino, the other just a bit after. ?And i did get a raduino for the first one. ?Spent dome time, a few minutes at a time, working slowly on a case.? Still a bit to do, as I was making the opening for the LCD display using a drill to make starter holse, then hacksaw blades and files. I could not find my nibbling tool, till I had the opening mostly done. Still need to finish that and mount everything. ?I also have a 2 board kit that will be a BITX20 when done. ?The boards and parts kit are from ?I like the power supply that is a part of the PA board, and can use an input of 14 to 24 volts AC or DC. Feeds the radio 12volts and 12 or more for the IRF510 final. Jumper selectable, but I am thinking of using a switch instead of jumper. ?Are so many mods that can be made. ?I think of doing some while building.. ?Wayne WA2YNE
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Re: Consider the Bitx40, clean and cheap for 40m
I will second this recommendation. I am running Allard's v2 software, and?the required modifications were easy to do. In addition to that, I added?the pop fix board that Kees sold a while back. Great radio.
--
Karl Heinz - K5KHK
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Hi Curt,
Chasing something, just can't find it :(
Have re-aligned countless times, result is always the same.
Have used several signal sources for calibration including WWV, CHU, and my 20MHz OCXO signal source.? Freq cal seems OK.
The BFO is another matter.? Have used several techniques including listening to myself transmitting on my Drake TR7, on the air signals,? zero beating audio (listening to a signal with the TR7 and uBITX at same time), etc.? The outcome is always the same. The BFO will set to the point that audio is understandable, but not very good. ? I am beginning to suspect there is an issue with the crystal filter - ????
At least with my audio mod and the RF preamp, it is usable, if not very pleasant to listen to.? FWIW, the current BFO setting is 11,997,335.
TNX, Woody - KZ4AK
toggle quoted message
Show quoted text
On 11/28/2018 16:54, Curt via Groups.Io wrote: Woody
like some builders I stumbled a bit in getting the wires in the right place -- but I am wondering if you may be chasing rabbits. the ubitx has been designed with some simplicity in mind, yet the receiver is thoughtfully designed.? are you sure your is appropriately aligned?? its the key step in making this receiver sound really nice.? I have a version 4 board - the receive audio is real nice in headphones.? there is no 'extra' gain in this receiver - so don't use a piece of wire - you need to use a transmit-worthy antenna.? do try different bands.? after patiently checking and possibly adjusting BFO - you should be copying nice SSB (I confess I could not blindly align my BFO - I searched the web for a typical setting, found one, and easily got it adjusted).
I would dig a little deeper on this before assuming this nice rig has diverse issues.? Looking at the construction approach -- automated assembly, testing after assembly - I don't expect many units to have issue - yours may be just fine.? my few cents of QRM here.
Curt
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Skip Davis