Date   

Cat control Test button GREEN but PTT test RED #cat #frequency #ubitx6-help

james@...
 

Ubitx v6.1 with WSJT-x  v2.1.2 (also tried latest rc3 and 2.2.2)
The test cat button is green but test ptt is red
The only rig that works is FT-847UNI - 817,857,897 all fail
Changing the Freq changes nothing on the rig - it appears all cat commands fail
Is this a compatibility issue ? Should I use an even older version of WSJT-X ?
thanks again 
James


Re: Hamlib error: Target VFO unaccessible #ubitxv6

james@...
 

OK it's working - thanks for all your suggestions ! 
Nano worked fine on desktop
I had connected the digital interface from Elekitsorparts to what I measured as 5 volts on the nano - DUH - should have checked the pin out first ! 
When connected to proper 5v pin communication was established 
Still had to change the rig to 847UNI to get cat control to work - 817 and 857 was no go
Thanks AGAIN for suggestions. Still feeling dumb for missing the obvious 
James

  


Re: Hamlib error: Target VFO unaccessible #ubitxv6

Evan Hand
 

James,
I use a miniUSB to USB cable.  The Nano can get power from the USB port when not powered by the Raduino.  On most USB ports there is enough 5 volt current to power the Nano, the Raduino, and the display (I have not tried a v6 as I do not have one).

I found issues with the Yaesu FT-817 settings, so switched to the FT-857.

Have you tried a driver update for the CH340 chip?

I would also be sure the Nano/uBITX is connected to the computer BEFORE you open the WSJT-X software.  For some reason on my laptop, the software will not find the port that is connected to the uBITX/Nano.

Things to try.
73
Evan
AC9TU

 


Re: Hamlib error: Target VFO unaccessible #ubitxv6

Dean Souleles
 

James and all,

The Arduino will "reset" upon connection or using the "Test CAT" button in WSJTX if DTR is on in the interface.

That is the way the Nano works.  

There is a known problem in the Hamlib code in the current version of WSJTX with the 

Try setting the rig type to FT-857, baud 3800 and see if that resolves your issue.

Dean


Re: Hamlib error: Target VFO unaccessible #ubitxv6

james@...
 

hi gector - I am using Windows 10 - tried 2 different computers and different usb cables. 
Voltage is 5.06 
How would I connect a standalone Nano on a breadboard to a USB cable ?
thanks
james


Re: Hamlib error: Target VFO unaccessible #ubitxv6

gector
 

Hi James,
I don't think the Raduino is supposed to reboot every time. Can you make sure it's getting ~5V (+-1V) with a multimeter? You can also remove the Arduino Nano from the raduino board and attempt to connect to it while it's just sitting there on your desk. That can help with some issues. I also recently encountered this error, but it wasn't WSJTX's fault. FLRIG and FLDIGI failed to connect to the device, usually with the same hamlib error... But it sounds like you might have a hardware issue.

What operating system are you using? On ubuntu 18.04, WSJTX was shipping with a version of hamlib that was bugged or something, and wouldn't connect to the ubitx. I upgraded to ubuntu 20.04 and the corresponding version of WSJTX worked. Rather, I think ubuntu 20.04 installed a different version of hamlib.


Re: ubitx v6.1 #ft8 #ubitx6-help #cat #wsjt-x

Evan Hand
 

Stephen,

Have you tried the "Fake It" setting under the Split section of the Radio tab?  Here is the explanation from the WSJT-X manual:

"Split Operation: Significant advantages result from using Split mode (separate VFOs for Rx and Tx) if your radio supports it. If it does not, WSJT-X can emulate such behavior. Either method will result in a cleaner transmitted signal, by keeping the Tx audio always in the range 1500 to 2000 Hz so that audio harmonics cannot pass through the Tx sideband filter. Select Rig to use the radio’s Split mode, or Fake It to have WSJT-X adjust the VFO frequency as needed, when T/R switching occurs. Choose None if you do not wish to use split operation."

You might want to check your BFO setting is the drop off is occurring at 1,000Hz.  Should be at 500Hz.

Here is the video from Ashhar Farhan on v6 calibration. 

https://www.youtube.com/watch?v=t6LGXhS4_O8

I would first just check the current BFO setting with the BFO Tuning Aide.  Only do the last BFO set, not the first or frequency calibration steps, if you see the "plateau" is significantly out of the center of the two bars.  In your case, If the drop-off is caused by the BFO calibration, it will be to the right of the center.


FWIW
73
Evan
AC9TU


Re: ubitx v6.1 #ft8 #ubitx6-help #cat #wsjt-x

Stephen KO4CVU
 

Kelly,
I notice a drastic decrease in power output when running digital with less than 1Khz offset on my uBITX v6.1 Is it just my unit or has anyone else noticed the same symptom? I am wondering if this could be related to the frequency response of the audio circuit since it happens on both the 20 meter and 40 meter bands.
Thanks,
Stephen, KO4CVU


Re: uBitx v6 board failure--suggestions? #ubitxv6 #v6

Jerry Gaffke
 

John,

If it's getting your goat, perhaps set it aside for a week or two.
Maybe ask for some help at a local amateur radio club.
But I think you are close to solving this.

Sounds like you have the IRF510's set to 100ma of idle drain current each, so the IRF510's are ok.
And that when you put an RF wattmeter between TP7 and ground when transmitting in CW mode
you see nothing on that meter, even when the trace from TP7 to the first relay is cut.
So it seems you are not getting RF power into the IRF510 gates from the driver stage.

Evan is right, next step is to check static voltages on all those driver transistors with a DVM when
attempting to transmit in SSB mode with no audio.  Should see the emitter somewhat above ground
(indicating quiescient emitter current) and the base about 0.6 volts above the emitter (indicating
the transistor is biased into the active region).
Here is the file from VU2ZAP:  https://groups.io/g/BITX20/files/VU2ZAP

If the static checks look ok, I suggest you next look for an RF signal that gets progressively stronger
at TP2,3,4,5,6 and the IRF510 gates while attempting to transmit in CW mode.
You could build a diode RF probe (a 1n5711 will be easier to find than a 1n34a and sensitive enough)  
    http://www.n5ese.com/rfprobe2.htm
or you could clip 3 feet of wire to each test point as an antenna and look for it with your other receiver
(but make sure the wire is insulated so it doesn't short to something like ground or 12vdc).

Jerry, KE7ER


On Sat, Jan 23, 2021 at 05:07 PM, Evan Hand wrote:
There is a static voltage chart in the Files section of this site.  Look for an Excel file from VU2ZAP.  It is for a v4, but the RF amp sections are pretty much the same, so the voltages should be good.  The static voltages around Q90 are a good indication if the transistor is blown.


Re: ubitx v6.1 #ft8 #ubitx6-help #cat #wsjt-x

WB0WQS
 

I  struggled a bit with the cat connection.  Then I went into the device manager and changed the
Baud rate to 38400...com4  and also set up wsjt-x for the same.  The cat control is working now.
I made a couple of FT-8 contacts on 10 meters today with it.  73.

Kelly Ellison
-WB0WQS


james@...
 

I have a new ubitx ver 6.1 
When I try to use WSJT-X I get the error "ham lib error: IO error while getting current frequency" and the Raduino reboot
The serial port settings are correct. 
I have tried older versions of WSJT and the newest beta version,
I have tried different rig settings - FT-817 857 897 etc
I have tried everything I have found online. Also tried 2 different pc's
I am out of ideas. Perhaps the unit is defective ?
Please Help ! Any suggestion?
thanks and 73 James


Re: uBitx v6 board failure--suggestions? #ubitxv6 #v6

Evan Hand
 

John,
There is a static voltage chart in the Files section of this site.  Look for an Excel file from VU2ZAP.  It is for a v4, but the RF amp sections are pretty much the same, so the voltages should be good.  The static voltages around Q90 are a good indication if the transistor is blown.

73
Evan
AC9TU


Re: uBitx v6 board failure--suggestions? #ubitxv6 #v6

John Terrell
 

Thanks again Jerry. FWIW, I used to be an electronics repair tech at a factory that made large, 200 amp switchers about 40 years ago. But I'm not an RF engineer. 
I've done most of what you suggested. I looked for shorts. Couldn't find a burned component or trace. I removed, tested and re-installed T11. It's fine. I even cut the trace from T7 to pin 13 on relay KA1. That made no difference. 
 
There is output, enough to hear on my IC-7600 on another antenna (a separate magnetic receiving loop). Connecting or disconnecting the T7 - KA1 link (I cut the trace and repaired it with a short length of hookup wire) makes no difference. It's enough to pin the needle on direct wire connection to a field strength meter but not enough to get the needle to budge on two separate wattmeters. I can adjust output to the drivers using RV1, but that's it. Basically it has about as much output as my MFJ antenna analyzer. And this is with RV2 and RV3 adjusted as you instructed, raising idle current 100 mA for each MOSFET.
 
I think this unit is a great way to get people on the air with a HF rig without having to spend a lot of money. And I've learned quite a bit myself. But I'm done with this board for now.  I don't know what's wrong with it. I'd rather switch it out. How can I go about doing that?
 
John Terrell
N6LN


Re: RPi Pico

Ken Hansen
 

I picked up a RPi Pico at Microcenter today - the shipment apparently sidestepped the inventory system, their in-store item count was -23!

I paid $2 at Dallas Microcenter - it's very nice to live close to a Microcenter...

Ken, N2VIP

On Jan 21, 2021, at 15:35, Dennis Zabawa <kg4rul@...> wrote:

$10.59 on Amazon and no shipping cost  - not expected in stock till third week of February


Re: RPi Pico

otalado
 

Ashhar said: "They have released visual studio."

I am afraid, you've read the announcement too quickly. At https://www.raspberrypi.org/blog/raspberry-pi-silicon-pico-now-on-sale/ they are stating: 
For power users, we provide a complete C SDK, a GCC-based toolchain, and Visual Studio Code integration. Visual Studio Code is just an editor (although it is a very good editor) and not an IDE. So don't count on Visual studio 209 just jet. And it is a lot better than the Arduino IDE. I have not checked yet if there is debugging available as I am still waiting for the RPI Pico to arrive. I was also impressed to have such an IDE available, but when I could not find anything about how to do it with VS 2019, so I re-read the announcement and realized it's VS Code and not VS. Who knows - perhaps someone will write an extension for VS in the future ...



Re: RPi Pico

Tom, wb6b
 

On Sat, Jan 23, 2021 at 09:19 AM, Jerry Gaffke wrote:
A good introduction to simple ADC's and DAC's can be found in chapter 3 of this
free (and excellent) book on DSP techniques.  The first link is Smith's webpage.
The second link has an option to download entire book as one file.
    http://www.dspguide.com/pdfbook.htm
    https://www.analog.com/en/education/education-library/scientist_engineers_guide.html
In the past CVSD was implemented in hardware only and achieved good practical results. 
See:


Re: RPi Pico

Jerry Gaffke
 

If you have an ADC but no DAC, you could make a DAC by driving a cap 
through a resistor from a GPIO pin and watch the voltage on that cap with the ADC. 
Firmware drives the voltage on the cap up or down till it agrees with the
digital sample that you are targeting.  An extra GPIO pin (normally tristated)
might be used if larger voltage swings between samples are needed.


A good introduction to simple ADC's and DAC's can be found in chapter 3 of this
free (and excellent) book on DSP techniques.  The first link is Smith's webpage.
The second link has an option to download entire book as one file.
    http://www.dspguide.com/pdfbook.htm
    https://www.analog.com/en/education/education-library/scientist_engineers_guide.html

You can jump right in on page 60 for the section "Single BIt Data Conversion".
It describes a delta converter, CVSD converters, and delta-sigma converters.


Arduino programs often use a counter-timer as a simple DAC.
Assuming a max count of 256 counting up at 1mhz, it sets the output to 1 at
the start of the count, clears it when the count reaches the 8 bit sample value.
The output pin of the counter-timer charges a cap through a series resistor,
giving a low pass filter that averages the voltage seen from the counter-timer.

The delta converter described by Smith is similar, it takes 256 ticks per sample
to create an ADC or DAC with 256 levels, but the output continuously flips 
up and down (for any sample values other than at the extremes of 0,1,FE,FF).
This makes the output easier to filter.  However, as the name "delta" suggests,
the output relates to the slope of the incoming waveform, not the actual value.

The CVSD converter is a delta converter that uses a special trick to increase
the possible slew rate, the rate at which the analog signal can change.
This reduces the bit rate required for a given bandwidth.

The delta-sigma converter adds tricks to a delta converter so the
digital value can represent the absolute value of the analog signal,
not just the slope.

That section of Smith's book will give you some idea  why many of the really cheap
microcontrollers have just a comparator, no ADC or DAC.

Jerry, KE7ER



On Fri, Jan 22, 2021 at 04:56 PM, Dr. Flywheel wrote:
PWM output in conjunction with an analog low pass filter can have very good and clean analog output, as long as the sampling frequency is significantly higher than the highest frequency component of the desired output signal. In addition, a 1-bit digital output with an analog integrator can be used to form an Adaptive Delta Modulator (CVSD) or ADPCM with high bit rate.
 
In the past CVSD was implemented in hardware only and achieved good practical results. 
See:
--Ron
N7FTZ


WARNING: Promotional material

Jack, W8TEE
 

All:

I have lowered the price of my Beginning C for Microcontrollers book on Amazon (search: B08GFDGN7P). Also, the small font size issue has been corrected and the book no longer tosses in a few blank pages for no reason. (The narrative was always all there; it just inserted blank pages.)

Jack, W8TEE

--
Jack, W8TEE


Re: TUNE signal for tuning tuners

Frank Krozel
 

Thanks everyone, lots to think of, I use a paddle when remote operation so looking for something simple.  Lots to digest, thanks all. Frank KG9H
(Informal uBitz net Sunday, 7.277 9:30A Central.  de KG9H


Re: FT8 and power levels

Rubens Kamimura
 

Hello everyone,

Grateful for the tips.
I changed the five relays of the uBITX v4, it improved a lot, for example it stopped oscillating the power, even with "fake it" unchecked for "split" operation. Now I need to resolve the issue of the absence of RF power in the range of 10 to 15m, I believe I will have to replace the Q90 transistor.
73
Rubens
py2pvb
--
Saudações fraternais, 
73's PY2PVB

Rubens Kamimura
Técnico em Eletrônica e Eletrotécnica - Aposentado
CFT/CRT-SP: 80254934820
Cel. +55 (18) 9-9819-2225 WhatsApp


Em sex., 22 de jan. de 2021 às 15:30, Rubens Kamimura <rubens.kamimura@...> escreveu:

Group,

Yes, uBITX has some problems, as it was developed to serve as economically as possible. That is why we are working and trying to improve. I am very grateful to the group for their help and attention. I have tried to work with a resting current of around 90mA and with injection (VR1 setting) for low power (QRP) in the range of 5 to 7 Watts (40m/FT8), to avoid RF feedback. But, there are inevitably unwanted feedbacks that we have to rework. Use JTDX with "fake it" selected.
73
Rubens
py2pvb


Em sex., 22 de jan. de 2021 às 10:55, Mitchel Rought <mitchelrought@...> escreveu:
As the originator of this thread I would like to thank everyone who joined in, I knew when I bought my uBITX V6 it was low power and planned on that
Since August I have made almost 500 contacts using FT8 which include 18 countries
Running low power means you pay a lot more attention to antenna construction, cable runs and definitely paying attention to band conditions and timing
Will be looking at slightly more power in the future but right now 5-7 watts is still fun

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