Date   
Re: burst of harmonics during CW key-down?

Jerry Gaffke
 

Far as I know, stock Bitx40 code remains exactly as it was when it first shipped in Dec of 2016.
Warts and all.
Good luck with that pull request.

These rigs are great as a vehicle for learning about radios.
They work as shipped, but could use a number of enhancements.
As you can see, lots of forum members are enjoying that process.
Many enhancements to the Bitx40 and uBitx have been posted to the forum,
but for the most part the kits continue to come with a minimum of changes.

I suggest you try Allard's code for the Bitx40, it is a major clean up of the stock Bitx40 code.
He has a fix for the PTT carrier burst.
    https://github.com/amunters
The Bitx40 code there works without any hardware mods, though some minor mods will add quite a few features.
The Bitx40-raduino-v2 code is similar but requires hardware mods, and gives many additional features.
If you find bugs, Allard may update his code to incorporate your fix.

Jerry, KE7ER


On Wed, Apr 17, 2019 at 06:14 PM, Adrian Chadd wrote:
Ok, I see the fix for the bitx40 firmware fork. I'll go test it out on afarhan's bitx40 firmware and if it works i'll send him a pull request. Hopefully I can get it into the normal v4 and v5 firmware trees.
 

Re: burst of harmonics during CW key-down?

Adrian Chadd
 

Oh sorry I messed up my last response. my ubitx v4 has this behaviour. I see the fix in the bitx40 firmware fork, sure; I'm going to try porting it to my ubitx v4 firmware fork and see if it works OK.


-adrian

Menu Sequence for CEC Firmware v1.200 #ubitx #firmware

Dan Pflugrath
 

I would like to change the menu sequence for the CEC Firmware v1.200.  I am familiar with the basics of the Arduino software development platform but after trying several times find it is beyond what I can figure out.  Any help in pointing out the method to use to modify the code to change the sequence of the menu items?

Re: burst of harmonics during CW key-down?

Adrian Chadd
 

Hi!

ok, so i fixed it in my fork:


This /seems/ applicable to all versions of the ubitx (3, 4, 5.) It's a mostly straight port from the bitx40 fork that fixed it.

Ian and other firmware hackers - would you mind taking a look and see if it makes sense?

Thanks!


-adrian
(kk6vqk)

Re: burst of harmonics during CW key-down?

John (vk2eta)
 

Thank you Adrian.

I also noted this affects my V3 uBitx and I will apply the mods to my customized version.

I am just surprised that a delay of 15ms is necessary after sending the clock shutdown command, presumably for the si5351 chip to stop its clock.

That's a 67Hz on/off max frequency and seems out of proportion with the clock frequencies generated (lowest is 3.5MHz in CW mode for the stock version) or even when compared with the transmission of the 8 registers needed to program the si5351 clock frequencies over the i2c bus which should take less than 1ms per clock.

I must be missing something.

The 30ms for the relays/TX power stabilization make sense to me on the other hand,

Best 73, John (VK2ETA)

Re: Homebrew li-ion battery pack into ubitx

Bill Lamm
 

The drok sight seemed to keep the reviews better organized..  I ordered through drok site..  I didnt see the common ground comment in my study of the reviews but I did see the extra capacitor and resistor..  I will report back when I get it on my bench. I suspect the bigger problems are with bigger transitions in voltage. I am just looking to tame battery power as the battery slowly looses power, its a loosing battle but if this thing makes the battery time smoother but shorter then thtat should be better then  slow fade..

Re: burst of harmonics during CW key-down?

Adrian Chadd
 

oh I based it on a 65ms delay on the bitx40 fork. I haven't actually measured it yet! midnight hackery and all that.



-adrian

On Thu, 18 Apr 2019 at 03:25, John (vk2eta) <vk2eta@...> wrote:
Thank you Adrian.

I also noted this affects my V3 uBitx and I will apply the mods to my customized version.

I am just surprised that a delay of 15ms is necessary after sending the clock shutdown command, presumably for the si5351 chip to stop its clock.

That's a 67Hz on/off max frequency and seems out of proportion with the clock frequencies generated (lowest is 3.5MHz in CW mode for the stock version) or even when compared with the transmission of the 8 registers needed to program the si5351 clock frequencies over the i2c bus which should take less than 1ms per clock.

I must be missing something.

The 30ms for the relays/TX power stabilization make sense to me on the other hand,

Best 73, John (VK2ETA)

Re: burst of harmonics during CW key-down?

Adrian Chadd
 

.. (and morning hackery - i hit send too quickly.)

I measured the RF output but I didn't measure the time it takes to gate the si5351. I have a bunch of breakout boards so I can go do that measurement separate from the ubitx and tweak that constant later. The bitx40 just sleeps for 65ms when turning on. I elected to split it up into two #defines so we can tweak each phase later on based on actual measurements.

Ok, now I'll get coffee. ;-P


-a


On Thu, 18 Apr 2019 at 03:25, John (vk2eta) <vk2eta@...> wrote:
Thank you Adrian.

I also noted this affects my V3 uBitx and I will apply the mods to my customized version.

I am just surprised that a delay of 15ms is necessary after sending the clock shutdown command, presumably for the si5351 chip to stop its clock.

That's a 67Hz on/off max frequency and seems out of proportion with the clock frequencies generated (lowest is 3.5MHz in CW mode for the stock version) or even when compared with the transmission of the 8 registers needed to program the si5351 clock frequencies over the i2c bus which should take less than 1ms per clock.

I must be missing something.

The 30ms for the relays/TX power stabilization make sense to me on the other hand,

Best 73, John (VK2ETA)

vfo cal.

Raymond House
 

Hello everyone,I'm Ray House, VE2OL, I have just completed assembling an Ubitx V5 with 3.5 in display. I am testing it with the original display and I find the VFO is out a lot, can someone point me towards info for it's calibration, if I go to 10mhz cal it goes into TX mode, is this normal? I have checked the wiki and this forum but found nothing on this, I'm sure it's just that I don't know where to look.Someone mentioned here that a new member should indicate what test gear he has, so, 100mhz storage scope,freq counter, function generator,RMS meter good to 10mhz and assorted VOM's. Any help will be greatly appreciated, thanks. 73

Re: vfo cal.

Jack, W8TEE
 

There are likely something like a bazillion posts here about calibrating the µBITX. Have you searched this group? Also, a valuable resource is ubitx.net, too.

Jack, W8TEE

On Thursday, April 18, 2019, 6:57:55 AM PDT, Raymond House <raymondh40@...> wrote:


Hello everyone,I'm Ray House, VE2OL, I have just completed assembling an Ubitx V5 with 3.5 in display. I am testing it with the original display and I find the VFO is out a lot, can someone point me towards info for it's calibration, if I go to 10mhz cal it goes into TX mode, is this normal? I have checked the wiki and this forum but found nothing on this, I'm sure it's just that I don't know where to look.Someone mentioned here that a new member should indicate what test gear he has, so, 100mhz storage scope,freq counter, function generator,RMS meter good to 10mhz and assorted VOM's. Any help will be greatly appreciated, thanks. 73

Re: vfo cal.

Adrian Chadd
 

hi!

The 30 second overview:


If you can plug in your audio into a computer and run a spectrum analyser (eg fldigi) it's MUCH easier to calibrate the BFO by looking for the right passband with just normal noise from your antenna.

Then after that you can calibrate the VFO - yes it goes into TX mode but it won't transmit a carrier unless you press PTT.


-a


On Thu, 18 Apr 2019 at 07:05, Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
There are likely something like a bazillion posts here about calibrating the µBITX. Have you searched this group? Also, a valuable resource is ubitx.net, too.

Jack, W8TEE

On Thursday, April 18, 2019, 6:57:55 AM PDT, Raymond House <raymondh40@...> wrote:


Hello everyone,I'm Ray House, VE2OL, I have just completed assembling an Ubitx V5 with 3.5 in display. I am testing it with the original display and I find the VFO is out a lot, can someone point me towards info for it's calibration, if I go to 10mhz cal it goes into TX mode, is this normal? I have checked the wiki and this forum but found nothing on this, I'm sure it's just that I don't know where to look.Someone mentioned here that a new member should indicate what test gear he has, so, 100mhz storage scope,freq counter, function generator,RMS meter good to 10mhz and assorted VOM's. Any help will be greatly appreciated, thanks. 73

Re: vfo cal.

MVS Sarma
 

https://petetest2017.files.wordpress.com/2019/01/micro-bitx-calibration-instructions.pdf

I got this link from a friend om mahesh vu2iia. It works. Whether stock or lees firmware  procedure is common . In stock you press rotary encoder and in lee firmware yiu use ptt. 

Please study, if it can support yoallthe best

On Thu, 18 Apr 2019, 8:13 pm Adrian Chadd <adrian@... wrote:
hi!

The 30 second overview:


If you can plug in your audio into a computer and run a spectrum analyser (eg fldigi) it's MUCH easier to calibrate the BFO by looking for the right passband with just normal noise from your antenna.

Then after that you can calibrate the VFO - yes it goes into TX mode but it won't transmit a carrier unless you press PTT.


-a


On Thu, 18 Apr 2019 at 07:05, Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
There are likely something like a bazillion posts here about calibrating the µBITX. Have you searched this group? Also, a valuable resource is ubitx.net, too.

Jack, W8TEE

On Thursday, April 18, 2019, 6:57:55 AM PDT, Raymond House <raymondh40@...> wrote:


Hello everyone,I'm Ray House, VE2OL, I have just completed assembling an Ubitx V5 with 3.5 in display. I am testing it with the original display and I find the VFO is out a lot, can someone point me towards info for it's calibration, if I go to 10mhz cal it goes into TX mode, is this normal? I have checked the wiki and this forum but found nothing on this, I'm sure it's just that I don't know where to look.Someone mentioned here that a new member should indicate what test gear he has, so, 100mhz storage scope,freq counter, function generator,RMS meter good to 10mhz and assorted VOM's. Any help will be greatly appreciated, thanks. 73

Re: vfo cal.

Raymond House
 

Thanks Jack and Adrian, I get it now and am calibrating it. Yes I will establish the BFO properly using FLDIGI, Good info and as Jack says lots of it on the cal procedure.


On Thu, Apr 18, 2019 at 10:43 AM Adrian Chadd <adrian@...> wrote:
hi!

The 30 second overview:


If you can plug in your audio into a computer and run a spectrum analyser (eg fldigi) it's MUCH easier to calibrate the BFO by looking for the right passband with just normal noise from your antenna.

Then after that you can calibrate the VFO - yes it goes into TX mode but it won't transmit a carrier unless you press PTT.


-a


On Thu, 18 Apr 2019 at 07:05, Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
There are likely something like a bazillion posts here about calibrating the µBITX. Have you searched this group? Also, a valuable resource is ubitx.net, too.

Jack, W8TEE

On Thursday, April 18, 2019, 6:57:55 AM PDT, Raymond House <raymondh40@...> wrote:


Hello everyone,I'm Ray House, VE2OL, I have just completed assembling an Ubitx V5 with 3.5 in display. I am testing it with the original display and I find the VFO is out a lot, can someone point me towards info for it's calibration, if I go to 10mhz cal it goes into TX mode, is this normal? I have checked the wiki and this forum but found nothing on this, I'm sure it's just that I don't know where to look.Someone mentioned here that a new member should indicate what test gear he has, so, 100mhz storage scope,freq counter, function generator,RMS meter good to 10mhz and assorted VOM's. Any help will be greatly appreciated, thanks. 73

Re: POP!!

Sam Tedesco
 

So, the onboard 5v reg was bad. Replaced it and the nano...and I'm still getting 12v to ground somewhere. Receive is perfect. TX immediately shuts the whole rig off. Was suspecting the 470uF caps at the finals but those seem ok. All relays and 3904s are ok. Any ideas?

Re: Confusing Directions

fejohnso
 

Martin:  I found this info from Jerry-KE7ER- very helpful when I wired up my BITX40. Hope it helps you.

Forrest, KC9JFX

On Wednesday, April 17, 2019, 7:27:00 PM EDT, Martin KM6TCD <peaceofandalus@...> wrote:


 
I'm trying to wire up the BITx40 and quickly reached the point where I was catching mistakes.
 
Called in a more experienced friend who said, "This doesn't make any sense!"
 
Colors of the wires don't match the description.
Photos of the boards don't match be board in front of us.
 
Has anyone run into this problem?
How did you solve it?
 
tks
KM6TCF

Re: POP!!

Adrian Chadd
 

hi,

disconnect the power rail to the finals (it's a separate pin on the ubitx.) Try again. that should isolate if it's something to do with the finals current draw or there's a short elsewhere.


-a


On Thu, 18 Apr 2019 at 08:25, Sam Tedesco <stedesco619@...> wrote:
So, the onboard 5v reg was bad. Replaced it and the nano...and I'm still getting 12v to ground somewhere. Receive is perfect. TX immediately shuts the whole rig off. Was suspecting the 470uF caps at the finals but those seem ok. All relays and 3904s are ok. Any ideas?

Re: burst of harmonics during CW key-down?

Jerry Gaffke
 

Adrian,

Thanks for posting your code!
Curious that it hadn't been addressed on the uBitx yet by anyone,
given that it was a known problem on the Bitx40.

Jerry, KE7ER


On Thu, Apr 18, 2019 at 12:39 AM, Adrian Chadd wrote:
ok, so i fixed it in my fork:
 
 
This /seems/ applicable to all versions of the ubitx (3, 4, 5.) It's a mostly straight port from the bitx40 fork that fixed it.
 
Ian and other firmware hackers - would you mind taking a look and see if it makes sense?
 
Thanks!

Re: Trial to control CW power (and reduce harmonics as a result) by unbalancing the 2nd mixer #ubitx

Jerry Gaffke
 

With John's mod of post    https://groups.io/g/BITX20/message/67981
any spurs and harmonics when operating CW should be
very similar to what is seen when operating SSB. 

If CW signal into the 45mhz IF is too large, distortion (and spurs) will increase.
To correct this, could replace R104 with something like a 5k pot,
top pin of pot to CW-KEY, bottom pin to ground, wiper pin to R105.
(Remember, with John's mod, R105 now goes to T4 pins 3,5.)
Adjust this pot such that CW transmit power is equal to SSB peak power.

If we are lucky, the mixer at D3,4 will want the same CW-KEY injection level
across all rigs, and we can use fixed resistors instead of a pot.
But that may well not be the case.

Jerry, KE7ER


On Wed, Apr 17, 2019 at 08:31 PM, John (vk2eta) wrote:
If someone with a spectrum analyzer could check the implications for the harmonics and spurs that would be a plus. I would expect in CW mode that the harmonic for 80, 40 and 30M bands would reduce, but some spurs to appear since we have the beat of two clocks now.  If there is interest I can modify Farhan's code to match that modification (or publish some code snippets).
 

Re: next ubitx

Curt
 

Short of doing lots of homebrew, we only get so many of these inside the radio experiences.  Hard to measure whether I spent more time on the K2 or the ubitx.  Of course the ubitx virtue is 'have it your way', while the caution of course is its key limitation. 

Given the challenge of our local builders - some of us doing just fine with transmit drive, others not so - an ALC circuit might indeed be a key addition (if you really sense the need).  Hint - the approach used by the K2 is documented in their manual - as I never 'broke' that part of the rig - I didn't learn about it.  Worth exploring what they did, even if there are unobtainium parts - actually I think they are garden variety. 

We should choose our battles carefully on what to do with the ubitx.  Certainly fix the low band harmonic spurious - very fixable.  I have taken a break from high band mixer spurs (the xtal filter fix wrecks low band CW).  It does mean if I build a clean PA for the lower bands - the combo should be clean, as my ubtix is now good on both CW/SSB up through 17m.  Whether I 'need' a 50 watt rig using ubtix is another story.  For now, enjoying the VK3YE AGC that works wonderfully, I am off buiiding the simple S-meter from an earlier SPRAT that is on the web.  If this rig had EVERY possible addition I don't think I would enjoy it any more.  Nice that many folk around the world can possess the same rig.  Maybe I should build that 40w PA so I can QSO with another ubitx in India when we get our next solar high. 

Don't lament what isn't easy to install -- thrive in the reachable possibilities. 

Curt

Re: Trial to control CW power (and reduce harmonics as a result) by unbalancing the 2nd mixer #ubitx

Jerry Gaffke
 

Could be that John's method of varying transmit power when transmitting CW
will make the use of fixed resistors to set the  D3,4 injection level OK.
But if that mixer or the crystal filter is getting overloaded on some rigs, 
may need the pot.


On Thu, Apr 18, 2019 at 09:38 AM, Jerry Gaffke wrote:
With John's mod of post    https://groups.io/g/BITX20/message/67981
any spurs and harmonics when operating CW should be
very similar to what is seen when operating SSB. 

If CW signal into the 45mhz IF is too large, distortion (and spurs) will increase.
To correct this, could replace R104 with something like a 5k pot,
top pin of pot to CW-KEY, bottom pin to ground, wiper pin to R105.
(Remember, with John's mod, R105 now goes to T4 pins 3,5.)
Adjust this pot such that CW transmit power is equal to SSB peak power.

If we are lucky, the mixer at D3,4 will want the same CW-KEY injection level
across all rigs, and we can use fixed resistors instead of a pot.
But that may well not be the case.

Jerry, KE7ER