Date   
Re: Calibration #calibration

Adrien F4IJA
 

Sascha : do you have the like for the formula of KD8CEC ? I can't find it on his website ?

Thank you,
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: Calibration #calibration

d.maccallum@...
 

Thanks for replying to my request for help. See the following link: http://ubitx.net/manual-kd8cec-firmware/
I am going to update my firmware to KD8CEC 1.061 or 1.072 because KM6SN put together a very well done manual and it documents exactly how use the new firmware.
The tune up and BFO adjustments have been improved in the new firmware. I am now waiting for a USB to Mini cable I just ordered for my laptop to Arduino Nano firmware update. I think that KD8CEC has corrected a lot of things and he also has a path forward for some great mods. Gonna add BCI filter, AGC fix and a 700 HZ cw filter. I think a lot of the problems have to do with not having AGC. I live in an area that has a lot of AM broadcast stations so the BCI filter should get rid of the interference. I like CW so I will put in the audio 700hz filter from the 4 State QRP club.

Have Fun....
Dave N8KZ

Re: Accidental Calibrate #ubitx #calibration

hickmodawg@...
 

I am just an ignorant beginner in amateur radio.  I hope someone can answer my plea for help.

I assembled my uBITX (v.5) and put it in an enclosure.  It works!  I am very happy!  My first real building success!

The receive sounds great.  My local HAM friends tell me that my transmitted CW sounds good too.

The problem is that the signal they receive is not on the frequency shown on my LCD.  Also, they transmit on a certain frequency, but I must tune to a different frequency to hear them.  Both my receive and transmit frequencies are different from what shows on my LCD.

Can I solve this by “calibration?”

I read some threads here and it seems that others have solved this problem but to a new beginner like me, the steps are not clear.  I’m not really experienced with Arduino or Raduino, but I’m eager to learn.

I know it’s a big ask, but, is there someone who might write a step-by-step detailed procedure for “calibrating” for a new beginner like me?  Including the very basic steps?  I’ve read some of the threads of those who have accomplished this.  I know I can do it, but I need a little help…

Thanks for all the great advice and help so far.  This forum has gotten me on the air and I have learned so much!

Martin, AJ6CL

Re: Calibration #calibration

Adrien F4IJA
 

I'm making a calibration page on my website here : http://www.tobeca.fr/f4ija/doku.php?id=ubitx:calibration

I'm writing it right now as i'm right now calibrating my rig. This method is simple and seems to work quite well in fact.
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: [ENA1J-B28-L00128L/

Wayne Leake
 

 John Scherer,
 the encoder you have is way too pricey, at over $52.xx each.
 I have a couple of nice low priced ones, with a breakout board, and several without the board that were way cheaper by far.
 I figure to use one with the Raduino, and another with a different Arduino,to control an si5153a, or whatever the number is, instead of the 10K or 100K pot.
I'm way behind,due to being held back by a combination of illness and having a number of things pop up, including losing a truck and some supplies when the truck decided to burn up last April 3rd.
will be working with BITX40's and a BITX20 ( I'm assembling it on a bare board pair).
 I love the idea of using the rotary encoders.
Glad to see a bit more information on them.
 Wayne WA2YNE
Imperial TX

Re: Gordon Gibby Digital Interface

 

All orders have been built and set for shipping. If by some random haze of madness I missed your order let me know. All orders will have a USPS tracking number linked to your paypal.

73

 More are on the way soon!
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: uBITX rotary enconder

Werner de Vos
 

What’s the benefit of using this encoder instead of the standard one? 

Re: uBITX rotary enconder

Adrien F4IJA
 

The one I've? I feel it smoother ans quieter and global better quality. 
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: uBITX rotary enconder

 

I also use this type of optical rotary encoder. It is much better and the feel is just perfect.
Between the encoder and the Radiuno I have a extra Arduino to adapt the pulses and divide them to not overrun the Radiuno.

I found a sketch by Jim Smith - G3ZQC and Glenn Percy - VK3PE to perform this task perfectly and only added some stuff for my project.

Try it !

Regards and 73's
PE1MHY
Guido

Re: Calibration #calibration

Evan Hand
 

Please be aware that the new v5 boards need to have the CEC version 1.2 or higher.  The IF frequency changed between the v4 and v5 boards.  IF you are going to go back to an older version of CEC for use on the v5 board you will need to go into the source and change the IF frequencies, recompile and then download.

Also be aware that the stock firmware requires a dummy load and separate receiver or frequency counter to calibrate.  The CEC software does not need the dummy load to calibrate.

The HF Signals' Tuneup web page instructions for step 2 are WRONG (Ashhar, this REALLY needs to be fixed!).  The stock firmware that I received on my v5 board put the uBITX into TRANSMIT mode at 10mhz.  Maybe this has changed with newer boards.

Since in my country (USA) 10MHz is not a valid ham frequency, a dummy load must be used.  I am pretty sure that this was done to facilitate the production testing/calibration process, however it does cause a problem if you are trying to calibrate and do not know that it will go into transmit mode at 10mhz.  It can also cause damage to the uBITX if left in this mode too long without a proper load. (note: QRP-Labs makes a nice 20 watt kit: http://shop.qrp-labs.com/dummy)

For the stock firmware, dummy load and receiver/frequency counter setup, it is fairly easy to set the receiver to 10mhz (I assume that you calibrated the receiver/freq counter before this) and adjust the calibration until you get a zero beat on the receiver or 10 MHz on the counter.  Using a frequency counter, it is just a matter of connecting  to the counter through an attenuator to reduce the signal (the QRP-Labs dummy has a tap on it).  Most counters will work with a short wire held near the dummy load, no physical connection needed.  If you have an oscilloscope with a frequency counter built in, you could use it.  Most oscilloscopes are not that accurate, so I do not recommend this approach, unless being used as a relative reference. 

Once the master clock has been calibrated, I have found that the BFO is best adjusted with a free audio spectrum analyzer software.  Connect a mic to the PC, find a frequency with only static, hold the mic close to the speaker and adjust until the amplitude of the signal displayed is between 500 and 2500 Hz.

Free PC software: http://www.techmind.org/audio/specanaly.html

Above is my free advice, please use with caution as I could be wrong and will not assume any responsibility for it's use.
Good luck!
73
Evan
AC9TU

Re: Calibration #calibration

Evan Hand
 

I went back and checked the QRP-Labs dummy load.  The connection is a filtered power indication.  This may not work for frequency counters, as the filter will lower the signal.  The small wire near the dummy is probably the best approach if you do not have a true attenuator.

Apologize for the miss information.
73
Evan
AC9TU 

Re: [ENA1J-B28-L00128L/

John Scherer
 


Yes, those encoders are pricey.  I got mine for like $4 each from a surplus electronics shop in San Diego.  Though, having used them now, I'd still be tempted to use them even if I had to buy one new.  The issue most people have with using high ppr encoders with the uBitx is the processor is pretty slow and the encoder routines in the base Raduino code are not interrupt driven.  Also using digitalReadFast to read the encoders helps.  If you get much beyond a single 400/600 ppr encoder and you will likely need a faster processor to do it.  I'm using the BITeensio board with a Teensy 3.6 processor.  I've tested that board with two 1024 ppr optical  encoders with no problems.  Those encoders would be of little use to the uBitx thought, without some division ;-)

--
John - N0CTL - Fulltime RV in a 40' motorhome

WTB 680nF Inductors #parts

Dale Hardin
 

Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL

I2C display plus other I2C devices, 3.3V #ubitx

Rob French (KC4UPR)
 

Hello, I have one of the 20x4 LCD displays on my uBITX, with the I2C backup to free up pins.  I removed the two pull-up resistors from the (5V) backup, so that I could use it in conjunction with the SI5351.  

Question... so I can't recall which pull-up is now getting used to pull the I2C lines up to 3.3V, but I'm wondering, can I add another I2C device to this bus, without adding any other conversions?  

Specifically, I would like to use I2C to communicate between the Raduino and a Teensy 3.2 that I'm using for DSP audio filtering.  I was going to use serial, but I decided it was too much of a pain to try to interrupt the CAT stream, so I figured I'd try I2C instead.  But I want to make sure I can actually add the Teensy to the mix.

Thanks!
-Rob

Re: I2C display plus other I2C devices, 3.3V #ubitx

Evan Hand
 

I have not yet done the mod, however KD8CEC at Hamskey.com has used the I2C line to link in second displays and Nano's for increased functionality.  To me that would imply that you can use the link to the Si5251.

FWIW
73
Evan
AC9TU

Re: I2C display plus other I2C devices, 3.3V #ubitx

Jim Sheldon
 

Our group, the TSW actually had this working long before CEC used it and the only problem you might run into is the Si5351 can accept no more than a nominal 3.3V signal level on the I2C lines.  If you connect a device to the I2C bus that has pullups to the 5V supply on the data lines, you risk destroying the 5351.  Address wise, as long as you stay away from the 5351's I2C address, you can have more than one thing operating on the bus.  

Jim, W0EB

------ Original Message ------
From: "Evan Hand" <elhandjr@...>
Sent: 9/21/2019 8:38:00 AM
Subject: Re: [BITX20] I2C display plus other I2C devices, 3.3V #ubitx

I have not yet done the mod, however KD8CEC at Hamskey.com has used the I2C line to link in second displays and Nano's for increased functionality.  To me that would imply that you can use the link to the Si5251.

FWIW
73
Evan
AC9TU

Re: I2C display plus other I2C devices, 3.3V #ubitx

johnrof@...
 

Easiest soln  is to use a two chan level converter (~50 cents). 
You can also make a 3.3 v device the master, with pullups to 3.3 v source.  Arduino will read 3.3 v as high.  

Contrary Raduino

JD Hill
 

Hello to the group. This is my first post here.
I am building A BITX40 and I am having a lot of trouble with it and I am about to believe it is a bad Raduino.
Regardless whether I hook it up via the USB port or by connection to a 12 volt supply. The display comes on but the only thing that is displayed is: VFO A: 6.9980 Mhz.

It draws about 135 mA but the function switch and the 10 turn tuning pot do not work.
This is my first experience with a microprocessor in my 43 years of being licensed. I have spent many hours building and trouble shooting,  but this has me lost.

TIA
Jimmy,. W9JDH


Re: WTB 680nF Inductors #parts

Ted
 

Re: WTB 680nF Inductors #parts

Jonas Sanamon
 

Hi Dale,

Not to discourage You from doing this,  but my experience with replacing the toroids with the 680nF SMDs showed no change whatsoever. I have photos of the spectrum analyser screens before and after and they are pretty much identical.  But maybe this is because i haven't done the relay replacement modification yet...?

Best Regards,
Jonas - SM4VEY

Den lör 21 sep. 2019 kl 13:22 skrev Dale Hardin <joe.dale.hardin@...>:

Anyone have surplus 680nF inductors for V3 fix of spurious signals?  If so, contact me privately to discuss details.
Thanks, Dale
--
Dale Hardin, KS4NS
Elberta, AL