Date   

Re: Collection of knowledge about CEC firmware? #firmware

riz-qcx@...
 

Thanks to all who responded - I hope I didn't come off as complaining.  This is a fantastic little radio (which I'm looking forward to tinkering with, as microcontroller stuff is right up my alley!), and the amount of stuff which folks have gotten it to do is nothing short of mindblowing!  I feel like I should have bought two, though, as I'm much bolder about my experimentation when a  mistake isn't likely to shut me down for a few weeks.  :) :) :)  This hobby is mostly about tinkering for me;  I don't own any other HF radios capable of transmitting (well, except this 20-meter QCX kit which I'm still in the process of troubleshooting...) so until I get this unit up and running I'm going to be off the air.  

I just wanted to make sure I wasn't missing something; I've definitely had the experience in the electronics world of struggling over weeks and months to learn something only to discover I'd been Googling wrong.  :) :) :)


Re: uBITX full design

Curt
 

Jonathan

Contact Farhan direct to explore what's possible. it might be possible to get boards assembled without toroids and the larger parts installed. I imagine the board is the primary IP to preserve the work for folk in India. Perhaps the effort can expose the students also to manufacturing by some video perhaps. I am confident Farhan will share some fine details with the students on PA circuitry, filters and isolation. Great to see your interest.

Curt wb8yyy rf engineer


Re: uBITX full design

Jerry Gaffke
 

Jonathan,

Be aware it might not be as trivial as it looks.

The transformers are described here:
    http://www.hfsignals.com/index.php/ubitx-circuit-description/
Search for "Coil Details".

The KiCad files are not available, that was some sort of requirement
when they set up HFSignals to build this stuff.
Perhaps to get a business loan they had to keep some part of the design private.
The remainder of the design is open source, and building from scratch is encouraged.
The uBitx is a two layer board, the bottom side is mostly ground plane.
Perhaps just build "ugly style" or "Manhatten style" on copper clad circuit board,
that way you have a solid ground plane under the entire design, which is highly recommended.

All quartz crystals in that IF filter should be matched by hand to within 100hz or so,
that means building a crystal oscillator and having some way to accurately measure frequency..
If your quartz crystals have different characteristics than what hfsignals uses,
you will need some way to determine the passband of the IF filter and adjust the filter shape
as described in Experimental Methods in RF Design (and/or search for Dishal on the web).

You will need some way to sniff and measure RF, an Antuino would be ideal,
though you might get by with a diode RF probe and a Harbor Freight DVM.
A good scope would be nice, perhaps 50mhz or more of bandwidth.
The nanoVNA would be worth looking into, shows complex of 1 and 2 port networks,
and thus is an education in itself.

If you are serious about studying "RF and Microwave", all of the above is worth the investment.

And lastly, maybe get a working uBitx from hfsignals, so you can
know for sure what the signals levels really should be when yours does not work.

Many have built radios like the uBitx from scratch.
But few find it easy.

Jerry, KE7ER



Re: Collection of knowledge about CEC firmware? #firmware

Ashhar Farhan
 

You have the K8CEC website itself anf the github repo with sufficient documentation. Additonally, ubitx.net offers a more narrational form of documentation.

F


On Sun 22 Sep, 2019, 8:53 PM Ted via Groups.Io, <k3rta=yahoo.com@groups.io> wrote:
Yes, direct langage toward setting parameters for WSPR mode in TX would be fantasmic.  I'm home on surgical recovery and will be restricted to brain exercise only ( as opposed to tower reconstruction)  and so now's a good time to play with it.


-ted


uBITX full design

Jonathan Kayne, KM4CFT
 

Hi,
I am trying to see if I can do a full assembly of the uBITX, that is, I want to start with a BARE PCB and hand solder on the SMD components. 
I was wondering if the KiCAD files were available or perhaps a BOM so I know what type of transformers are being used.
I am planning on using it in a school project, so that's why I am asking.
I am more than happy to reverse engineer the PCBs if need be.
Also, I was wondering if there was anything particular I would need to know about the trace layout for the boards. Is there a ground plane on the bottom layer with the other traces on the top? (I couldn't find pics of the bottom side so I wasn't sure)
Any help would be much appreciated!
73,
-Jonathan Kayne, KM4CFT
Virginia Tech Electrical Engineering (RF and Microwave Concentration)
Virginia Tech ARA Vice President


Re: Collection of knowledge about CEC firmware? #firmware

Don - KM4UDX
 

Jeff -- the doc is "distributed".  Meaning it is a wild wild West situation. Google search seems the only (poor) tool to identify CEC-related  doc, vids, discussions. But others know better and someone is always able to say...oh that file is here in location XYZ, obviously. 

I took the MM displayed values as exactly reflecting current config parameters.  While simple, having a semi-gui interface to uBITX parameters is heavenly. To be able to read,c  write, reboot, observe/play, then repeat as necessary, was a revelation.

On WSPR, you might want to read up on the WSJTX doc describing the WSJTX freq calibration procedures.  These process within wsjtx are the most wicked clever bits of code/processes i've ever encountered. Yes, I don't get out much. Hahah.  The CEC software essentially implements a short hand version of the same process in WSJTX. So, if you understand how WSJTX does it, you will be most likely be able to figure out how CEC does it. 

Don
Km4udx


Re: Collection of knowledge about CEC firmware? #firmware

Ted
 

Yes, direct langage toward setting parameters for WSPR mode in TX would be fantasmic.  I'm home on surgical recovery and will be restricted to brain exercise only ( as opposed to tower reconstruction)  and so now's a good time to play with it.


-ted


Re: WTB 680nF Inductors #parts

 

Hi,

Not to complicate matters, but in old posts I've seen two different inductors being discussed:  680nH ones on a filter, and 680uH ones placed on the relays.  Has anyone tested either of those strategies to show measured reductions in the problem spurs on SSB in the higher frequency bands?  I also recall others saying that the 680nH filter inductors were causing fairly significant power reduction on 40m -- was this always the case or has the modification worked for some and not for others (depending on what)?

73,


Mark.


Re: WTB 680nF Inductors #parts

Dale Hardin
 

Raj, l don't want to have to buy 100 off eBay, so that's why I am looking to find the parts on the group.  Regards, Dale



On Sun, Sep 22, 2019, 2:08 AM Raj vu2zap <rajendrakumargg@...> wrote:
I've tried similar ones and they DONT work. The issue with the original toroids is that
their leads seem to pick up TX signal and cause a mess.

Change the relays and you are almost there. Use SHIELDED smd insuctors and you
will get reduction in spurs. Any old inductor there wont do.

If the 680nh does not help then you have the wrong type.

Raj

At 21-09-19, you wrote:
I bought these, and reasonably-shipped:

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F352066947527


Ted
k3rta


--
Dale Hardin, KS4NS
Elberta, AL


Re: WTB 680nF Inductors #parts

 

I've tried similar ones and they DONT work. The issue with the original toroids is that
their leads seem to pick up TX signal and cause a mess.

Change the relays and you are almost there. Use SHIELDED smd insuctors and you
will get reduction in spurs. Any old inductor there wont do.

If the 680nh does not help then you have the wrong type.

Raj


At 21-09-19, you wrote:
I bought these, and reasonably-shipped:

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.co.uk%2Fulk%2Fitm%2F352066947527


Ted
k3rta


Re: Contrary Raduino

Ashhar Farhan
 

It looks like your potentiometer doesnt have a +5v connected. Can you confirm that the pot's center pin changes voltage smoothly between 0 to 5v as you tune it?
- f

On Sat 21 Sep, 2019, 10:07 PM JD Hill, <w9jdh.qrp@...> wrote:
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: Calibration #calibration

d.maccallum@...
 

Adrien, thank you for this excellent information. I will be downloading V 1.2 or higher firmware and use your method for calibration. Should have my programming cable for the nano by end of next week.

TNX FER THE HELP 73

Dave, N8KZ


Collection of knowledge about CEC firmware? #firmware

riz-qcx@...
 

I have a v5 µBITX that I've been fiddling around with for a while, and it looks like just about all the stuff I'm interested in being able to do with it will be better-enabled with the CEC firmware.  So, I got v1.200 and built it (I still have the stock parallel display) because I could not for the life of me make any of the hex loaders work - but was able to build and load it using the Arduino IDE.

So far, so good.  There are a number of issues with it that I expect will all get worked out eventually (for example, the CW filters make a CW signal barely audible - I've seen allusions to that issue on this board, and to there being settings which help, but I have been unable to find those settings.

I also just grabbed the uBITX manager software, v1.110 - I was disappointed to find out it was a Windows program, but managed to dig up an old laptop.  First thing I did was read the settings and save them - but some of this stuff looks Wrong.  (Example - "LSB calibration" is 0, but "USB calibration" is 11057115.  Not sure what these are...  Also, Si5351 I2C address is set to 0xff, while there's a warning in red which says "Warning: default value:0 or 0x60".  Worrisome!

Anyway, this brings me around to:  is there a repository for knowledge about this firmware and what all the settings are?  I found a "User Manual" for version 1.072, which helped, but the pieces I am particularly interested in are either not implemented yet, or just not written about.  (Example: how is the WSPR stuff set up and used?  I would love to know!)   I've looked around hamskey.com and ubitx.net, but it's all pretty fragmented.  Failing that, can anyone point me to threads here which would help?

I suppose if I need to, I can look through the source code, but I bet other folks have gone through all this before.  :)  Did I also forget to mention that I don't have a lot of direct experience with HF rigs yet?  :) :) :) It's also complicated by the fact that I live smack in the middle of San Francisco with all the noise that entails, so even with the antenna I've got set up (20m EFHW) I can't hear a lot


Thanks in advance,

+jeff AJ6IY


Re: Calibration #calibration

d.maccallum@...
 

Thank you for saving this old dog from barking up the wrong tree. I will down load V 1.2, Big help thanks again...

I have a dummy load and a good comm receiver to check the ubitx tx with. The TX and RX are working but the BFO adjustment for clear audio is very bad. cw works very nice and clear!

OK big help CUL 73

Dave N8KZ


Re: WTB 680nF Inductors #parts

Dale Hardin
 

MadRadioModder, that would be too easy.  I am not an electronics expert, only a builder and tinkerer.  I will learn more from modding the V3 than I will ever learn from assembling the V5.  Just my thing, I guess.  I just enjoy the build.  Funny comment, though.  Dale

On Sat, Sep 21, 2019 at 6:09 PM MadRadioModder <madradiomodder@...> wrote:

An easier fix is to sell the V3 and buy a V5.  Boom.  Done.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Dale Hardin
Sent: Saturday, September 21, 2019 5:10 PM
To: BITX20@groups.io
Subject: Re: [BITX20] WTB 680nF Inductors #parts

 

I think the whole smd inductor - alternate relay thing has been discussed to death.  Seems there are two options, inductor-relay fix or off-board relay fix.  I can do the inductor-relay fix without cutting and pasting a new board in (sorry Gordon Gibby).  If that doesn't do the job on my board, then I will spring for the off-board relays.  I do want to use the very same inductors that work, but I don't want to buy 100 of them, hence my request.  I'm sure there are thousands available here on the group.  You didn't say what solution you found to the spurs issue.  Did you go the off-board relay way?  Thanks for your comment. Dale

 

On Sat, Sep 21, 2019 at 4:07 PM Jonas Sanamon <sanamon@...> wrote:

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


 

--

Dale Hardin

24750 State St. Unit 487

Elberta, AL 36530
251-597-9256


--
Dale Hardin, KS4NS
Elberta, AL


Virus-free. www.avg.com

--

…_. _._



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL


Re: WTB 680nF Inductors #parts

Dale Hardin
 

Yeah, whats a few farads or henrys between friends.  We all know what I am looking for nomatter how I say it.  You're also right that this fix only address harmonics, not spurs. I knew that. That's what I get from using the laptop at home rather than the desktop in the office where my info is.  My memory isn't what it used to be and I'll be the first to admit it.  Beats the alternative though.  I've got to do the V5 filter fix also.  I think I have all the parts for that.  Regards, Dale

On Sat, Sep 21, 2019 at 5:39 PM Evan Hand <elhandjr@...> wrote:
Sorry to nit pick, however I do not know where to get 680nF inductors, only 680nH inductors.  I assuming that you do mean the 680 nanoHenry inductors that were suggested by Raj, vu2zap in this thread:
https://groups.io/g/BITX20/topic/27154925#60568

That is unless I missed something about a part number.

Also, the relay and or off board filters do not address the spurs issues, only the harmonics issues.  The 2 spur fixes are either the shielded SMD inductors per Raj, or the Ashhar v5 fix with an LCL low pass filter before the last mixer in the transmitter chain.

It should be noted that there seems to be less harmonics when using SSB, but higher spurs on the upper bands.  For CW, Harmonics on the lower bands, and less on upper bands with little reported spurs on any band. 

This goes along with what I have been able to measure, though I do not trust the spurs testing that I did due to a poor RBW on the spectrum analyzers that I had at my disposal at the time.

73
Evan
AC9TU



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL


Re: WTB 680nF Inductors #parts

MadRadioModder
 

An easier fix is to sell the V3 and buy a V5.  Boom.  Done.

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Dale Hardin
Sent: Saturday, September 21, 2019 5:10 PM
To: BITX20@groups.io
Subject: Re: [BITX20] WTB 680nF Inductors #parts

 

I think the whole smd inductor - alternate relay thing has been discussed to death.  Seems there are two options, inductor-relay fix or off-board relay fix.  I can do the inductor-relay fix without cutting and pasting a new board in (sorry Gordon Gibby).  If that doesn't do the job on my board, then I will spring for the off-board relays.  I do want to use the very same inductors that work, but I don't want to buy 100 of them, hence my request.  I'm sure there are thousands available here on the group.  You didn't say what solution you found to the spurs issue.  Did you go the off-board relay way?  Thanks for your comment. Dale

 

On Sat, Sep 21, 2019 at 4:07 PM Jonas Sanamon <sanamon@...> wrote:

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


 

--

Dale Hardin

24750 State St. Unit 487

Elberta, AL 36530
251-597-9256


--
Dale Hardin, KS4NS
Elberta, AL


Virus-free. www.avg.com

--

…_. _._


Re: WTB 680nF Inductors #parts

Evan Hand
 

Sorry to nit pick, however I do not know where to get 680nF inductors, only 680nH inductors.  I assuming that you do mean the 680 nanoHenry inductors that were suggested by Raj, vu2zap in this thread:
https://groups.io/g/BITX20/topic/27154925#60568

That is unless I missed something about a part number.

Also, the relay and or off board filters do not address the spurs issues, only the harmonics issues.  The 2 spur fixes are either the shielded SMD inductors per Raj, or the Ashhar v5 fix with an LCL low pass filter before the last mixer in the transmitter chain.

It should be noted that there seems to be less harmonics when using SSB, but higher spurs on the upper bands.  For CW, Harmonics on the lower bands, and less on upper bands with little reported spurs on any band. 

This goes along with what I have been able to measure, though I do not trust the spurs testing that I did due to a poor RBW on the spectrum analyzers that I had at my disposal at the time.

73
Evan
AC9TU


Re: WTB 680nF Inductors #parts

Dale Hardin
 

Were you able to test to see if they worked?  Dale

On Sat, Sep 21, 2019 at 1:14 PM Ted via Groups.Io <k3rta=yahoo.com@groups.io> wrote:
I bought these, and reasonably-shipped:



Ted
k3rta





--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL


Re: WTB 680nF Inductors #parts

Dale Hardin
 

I think the whole smd inductor - alternate relay thing has been discussed to death.  Seems there are two options, inductor-relay fix or off-board relay fix.  I can do the inductor-relay fix without cutting and pasting a new board in (sorry Gordon Gibby).  If that doesn't do the job on my board, then I will spring for the off-board relays.  I do want to use the very same inductors that work, but I don't want to buy 100 of them, hence my request.  I'm sure there are thousands available here on the group.  You didn't say what solution you found to the spurs issue.  Did you go the off-board relay way?  Thanks for your comment. Dale

On Sat, Sep 21, 2019 at 4:07 PM Jonas Sanamon <sanamon@...> wrote:
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



--
Dale Hardin
24750 State St. Unit 487
Elberta, AL 36530
251-597-9256

--
Dale Hardin, KS4NS
Elberta, AL