Date   
Re: V4 TX problems and new finals #ubitx-help

 

Hi,

In WA2EBY's original paper he carefully studied the requirements for keeping the IRF510 at a safe temperature:

"The amplifier can also be damaged by overheating.  This limitation is imposed by the TO-220 packages in which Q1 and Q2 are housed.   The thermal resistance from junction to case is a whopping 3.5°C/W.  This huge value makes it virtually impossible to keep the junction temperature from exceeding the +150°C target for good reliability."

"
To keep the transistor junction temperature below +150°C requires preventing the transistor case temperature from exceeding 46.8°C."

"Also, there is a temperature rise across the mica insulator between the transistor case and heat sink of 0.5°C/W.  That makes the maximum allowable heat sink temperature limited to 46.8 – (0.5 × 29.5) =32°C."

73,


Mark

Re: V4 TX problems and new finals #ubitx-help

Don - KM4UDX
 

Edwin -- why did get those exact thermal switches? Because I wanted the fans on, until it got warm, then turn off. And that worked perfectly. hahah.

No, actually, I was a dope and didn't pay enough attention when I purchased them, and then I failed to test'em.  [We don't need no stinking test'en here!!]

So the switch and fan combination worked the exact opposite way I wanted. Perfectly wrong.

On the other hand, they quickly failed. So I guess we are even.

At the risk of further humiliation, would you pass me a link to the correct thermal switch?  I will endeavor to not spectacularly screw up the second go-round.

Don
km4udx

Re: Templates for China EF01 Electronic Plastic Shell Project Case for a BITX40

Erwin Serlé
 

Steve, plastic might be more brittle than metal, so try out the knibbling on a scrap piece first.

I am currently printing on my Ultimaker Original and also building a Dremel 4000 tool 3D printed CNC machine (Nikodem Bartnik), to make pcb's and panels and so on
--
PE3ES - F4VTQ - Erwin
73

Re: V4 TX problems and new finals #ubitx-help

Erwin Serlé
 

On Wed, Dec 18, 2019 at 09:14 PM, Don - KM4UDX wrote:
Don
km4udx
I see you use NO switches starting from 35 degrees Celsius. In a case that would mean the fans are almost always on. Why did you pick this specific temperature point? I just bought a 50 degrees Celsius to switch a fan in a power supply on. For uBITx it might be somewhere in the 50-60 degrees range I would think.

PE3ES/F4VTQ-Erwin

 
--
PE3ES - F4VTQ - Erwin
73

Re: ubitx v6, refactored code

Jerry Gaffke
 

The code of post https://groups.io/g/BITX20/message/44278
makes calibration trivial and also provides a way to center the signal
in the 45mhz and the 12/11mhz crystal filters.

With regard to the v6, see post   https://groups.io/g/BITX20/message/73653
And if curious, follow all the links from that post down into previous discussions.

Jerry, KE7ER



On Thu, Dec 19, 2019 at 08:37 AM, Adrian Chadd wrote:
On Wed, 18 Dec 2019 at 21:58, Ashhar Farhan <farhanbox@...> wrote:

There is no problem with the firmware on the shipped units. They wouldn't work at all if the firmware didnt compile.
A bracket was missing on the uploaded firmware as the person cleaned up a commented line under the if statement before uploading the source code. You don't have to load or tune up the radios and they work out of the box.
I understand that rick had a problem with a badly crimped connector. It would be impossible for us to test all the individual components. We test the displays, arduinos, all coils and crystals before the board is assembled. After assembly, we set the PLL calibration, the bfo, the pa bias, we test ssb and cw on 80, 40, 20 and 10 meters. The alignment has to be done on the pair of the digital board (raduino) and the analog board (the main board) as the crystals of the IF filter and the crystal of the Si5351 have to be calibrated and aligned with respect to each other too.
I've stumbled across a couple posts from kd8cec about his experiments
with IF offset where he found the si5351 calibration would also
benefit offsetting the first IF (45MHz) as well to compensate for both
what I guess may be a little drift between 45MHz filters but also the
si5351 xtal.

I'm experimenting with it on my v4 ubitx and see that indeed there's a
benefit from offsetting the first IF / VFO frequency too. I'm trying
to nail it down using the kd8cec firmware and then port the minimum
set of changes needed to your v4 firmware.

Have you looked into that as well?

Thanks!

Re: V6 radino on V5 board?

Jerry Gaffke
 

From Farhan's post of    https://groups.io/g/BITX20/message/73708
>  The V6 is just an easier to assemble v5. No difference at all but for the touch display.
>  You can buy the tft off ali express for about 5 dollars and upgrade the firmware.

So the answer is yes, you can update a v5 to have a v6 style display.
No need to swap out the entire Raduino, just the display itself.
Then burn the v6 firmware into the Nano.

I believe the Raduino board has not changed since first introduced for the Bitx40,
except that now a socket is used on the Nano to make it easier to replace.

The old 2x16 display just plugs in, hopefully the new display can plug into
that same old connector with no soldering necessary.

In the past, it has been possible to buy a Raduino separately from hfsignals for about $30.
I don't see that as an option on hfsignals.com now, the only items to buy are the complete v6 uBitx and the Antuino.
But if the display is easy to swap out, and the Nano is socketed and thus easy to replace if it fails,
that covers most of why you would want a new Raduino. 
About the only other stuff on the Raduino is connectors, LM7805 regulator, and the si5351.
If you really do need a new Raduino there have been third parties posting to the forum
offering their own version for sale, some of them with significant enhancements.

Jerry, KE7ER


On Thu, Dec 19, 2019 at 08:18 AM, A Kiddoo wrote:
Will it be possible to purchase a V6 Radino only and adapt it to a V5 main board? Could this be a possible future upgrade path? Inquiring minds want to know.

Re: ubitx v6, refactored code

Adrian Chadd
 

On Wed, 18 Dec 2019 at 21:58, Ashhar Farhan <farhanbox@...> wrote:

There is no problem with the firmware on the shipped units. They wouldn't work at all if the firmware didnt compile.
A bracket was missing on the uploaded firmware as the person cleaned up a commented line under the if statement before uploading the source code. You don't have to load or tune up the radios and they work out of the box.
I understand that rick had a problem with a badly crimped connector. It would be impossible for us to test all the individual components. We test the displays, arduinos, all coils and crystals before the board is assembled. After assembly, we set the PLL calibration, the bfo, the pa bias, we test ssb and cw on 80, 40, 20 and 10 meters. The alignment has to be done on the pair of the digital board (raduino) and the analog board (the main board) as the crystals of the IF filter and the crystal of the Si5351 have to be calibrated and aligned with respect to each other too.
I've stumbled across a couple posts from kd8cec about his experiments
with IF offset where he found the si5351 calibration would also
benefit offsetting the first IF (45MHz) as well to compensate for both
what I guess may be a little drift between 45MHz filters but also the
si5351 xtal.

I'm experimenting with it on my v4 ubitx and see that indeed there's a
benefit from offsetting the first IF / VFO frequency too. I'm trying
to nail it down using the kd8cec firmware and then port the minimum
set of changes needed to your v4 firmware.

Have you looked into that as well?

Thanks!


-adrian
(kk6vqk)

Re: ubitx v6, refactored code

Rick Green
 

On Thu, 19 Dec 2019, Ashhar Farhan wrote:

I understand that rick had a problem with a badly crimped connector. It would be impossible for us to test all the individual components.
Yes, its frustrating that the simplest problems take so long to track down. That was certainly a DOH! moment (slaps head...). It's on me, not you. I often preach 'Look for the simplest problems first', yet I catch myself missing what should be obvious way too often,
The incorrect assembly instructions, and the bad jumper itself, were part of the inkits case kit, not the uBitx itself from HFSIGNALS, so again, clearly not your problem. and those have been found and corrected, so moving on...
I've been tinkering with this since May, off and on. I've certainly had a lot of fun and education along the way, but I have yet to hear a recognizable voice or copy a single character of code. I've got a beautiful little box that _almost_ works. I just need to get the oscillators somewhere 'in the ballpark' so that I can finish a calibration using the procedure you published. Or might there be another, simpler maybe, reason for zero receive sensitivity?

--
Rick Green

We, the People of the United States of America, reject the U.S. Supreme Court's
Citizens United ruling, and move to amend our Constitution to firmly establish
that money is not speech, and that human beings, not corporations, are persons
entitled to constitutional rights.

http://www.MoveToAmend.org

V6 radino on V5 board?

A Kiddoo
 

Will it be possible to purchase a V6 Radino only and adapt it to a V5 main board? Could this be a possible future upgrade path? Inquiring minds want to know.

Re: For Sale new uBITX kit with additional uBITX board plus display

Patrick Pelletier
 

Hi Jim,

Would you be willing to sell the board only?  I have a Raduino with a board I messed up...

Thanks,

Patrick
VE9PAX


On Thu, Dec 19, 2019, 10:59 AM Jim Sorenson, <kjsorenson@...> wrote:
I have a new uBITX kit and a spare uBITX board for sale. 

The uBITX board without the Raduino was part of a working system till I blew out the Raduino. 
The uBITX kit is new in the box and was purchased within the last 5 months. 
I'll include a display and various part from the first kit. 

$150 for both kit and additional board, parts and display
PayPal to my email and I can ship today CONUS - shipping on me. 

I enjoyed using the uBITX while the Raduino was OK, but am moving house and would not get back to this project for some time. 

Many thanks, 

Jim Sorenson
W3BH

www.w3bh.com







For Sale new uBITX kit with additional uBITX board plus display

Jim Sorenson
 

I have a new uBITX kit and a spare uBITX board for sale. 

The uBITX board without the Raduino was part of a working system till I blew out the Raduino. 
The uBITX kit is new in the box and was purchased within the last 5 months. 
I'll include a display and various part from the first kit. 

$150 for both kit and additional board, parts and display
PayPal to my email and I can ship today CONUS - shipping on me. 

I enjoyed using the uBITX while the Raduino was OK, but am moving house and would not get back to this project for some time. 

Many thanks, 

Jim Sorenson
W3BH

www.w3bh.com







Re: Unbuilt Bitx40, uBitx - new, lower prices

Ken Hansen
 

Both the Bitx40 and uBitx have been sold, thanks to all that expressed interest.

Ken, N2VIP

On Dec 15, 2019, at 18:40, Ken Hansen <ken@...> wrote:

*** Note, resend or previous email with new lower prices ***

Hello all,

I've got two unbuilt/unattempted kits for sale. Both kits are as packed by HFSIGNALS.

First up, an unbuilt Bitx40 from Dec. 2016, 2x speakers and an undrilled case from Amazon (blue & white) sold as kit, looking for $50 shipped ConUS. (Pictures of case available, contact me directly if interested.)

Second, I have an unbuilt uBitx from Feb. 2019, asking $100 shipped ConUS.

Both kits have original invoice from HFSIGNALS.

PayPal accepted, email me direct with any questions.

Thanks,

Ken Hansen, N2VIP
ken@...

Re: V4 TX problems and new finals #ubitx-help

Don - KM4UDX
 

Heat sinks can't touch? what? no body told me that! (haha)

I let them be very friendly with each other...I figured they like to work together.  I decided to bolt direct with no insulator, and take all the risks of shorting to the cabinet case, probes, random wires, and problematic fans,  and the like. The gain is a fraction more efficient energy transfer. (meaning I couldn't find the insulators.) But clearly the cost/benefit ratio is not in my favor.

I'll ry to find them put them in next time I want to get silicon grease all over my fingers. hahaha.

Don

Re: ubitx v6, refactored code

VISWANATHAN R ELAYIDOM
 

Expecting more about v.6


On Thu, Dec 19, 2019, 12:52 PM Steve Sawicki via Groups.Io <ab2et=yahoo.com@groups.io> wrote:
Antony,
I am glad that Ashhar Farhan has indicated that all shipped V6 full kit units will have fully tested and compiled operational firmware when shipped, that makes me a happy camper as I want to finish the construction and operate the unit as designed by Ashhar and the team
 
.Yes I understand that many other individuals want to see if their addons will work with the new "official" code V6 and to possibility get AF to modify to make it complaint to their addons.
I have been a silent supporter of Ashhar's vision and mission of design and local work inclusion from the start and I am sure that many in the Florida region have many of his products, in my previous area in Florida the BIT40 was a "Gift" to any ham that upgraded to General or above as where the Bofangs when they got their Technician.
I went through that process with the original  BIT40 way back, when it was fun kicking of a $50 radio and as well even with the "WireShark".scenario.
Things have chanced and so has the radio world and I am hoping of not reliving the past.
One only to have a look at the dropping price of the China built "digital radio" clones  to see that the worlds may eventually meet at least in price if one has to keep attaching addons.
Best Regards
 Seasons Greetings and Wishing All a Happy and Healthy New Year.
Steve
AB2ET
"The Villages Florida U.S.A"
 


--
Which is the latest version

Re: ubitx v6, refactored code

Steve Sawicki
 

Antony,
I am glad that Ashhar Farhan has indicated that all shipped V6 full kit units will have fully tested and compiled operational firmware when shipped, that makes me a happy camper as I want to finish the construction and operate the unit as designed by Ashhar and the team
 
.Yes I understand that many other individuals want to see if their addons will work with the new "official" code V6 and to possibility get AF to modify to make it complaint to their addons.
I have been a silent supporter of Ashhar's vision and mission of design and local work inclusion from the start and I am sure that many in the Florida region have many of his products, in my previous area in Florida the BIT40 was a "Gift" to any ham that upgraded to General or above as where the Bofangs when they got their Technician.
I went through that process with the original  BIT40 way back, when it was fun kicking of a $50 radio and as well even with the "WireShark".scenario.
Things have chanced and so has the radio world and I am hoping of not reliving the past.
One only to have a look at the dropping price of the China built "digital radio" clones  to see that the worlds may eventually meet at least in price if one has to keep attaching addons.
Best Regards
 Seasons Greetings and Wishing All a Happy and Healthy New Year.
Steve
AB2ET
"The Villages Florida U.S.A"
 

Re: ubitx v6, refactored code

Ashhar Farhan
 

There is no problem with the firmware on the shipped units. They wouldn't work at all if the firmware didnt compile.
A bracket was missing on the uploaded firmware as the person cleaned up a commented line under the if statement before uploading the source code. You don't have to load or tune up the radios and they work out of the box.
I understand that rick had a problem with a badly crimped connector. It would be impossible for us to test all the individual components. We test the displays, arduinos, all coils and crystals before the board is assembled. After assembly, we set the PLL calibration, the bfo, the pa bias, we test ssb and cw on 80, 40, 20 and 10 meters. The alignment has to be done on the pair of the digital board (raduino) and the analog board (the main board) as the crystals of the IF filter and the crystal of the Si5351 have to be calibrated and aligned with respect to each other too. 
- f


On Thu 19 Dec, 2019, 8:53 AM Jack, W8TEE via Groups.Io, <jjpurdum=yahoo.com@groups.io> wrote:
It's a two-edge sword. If someone finds a hiccup, do you want it fixed now, or 6 months from now. If you don't like doing field upgrades to your software, don't do it. Let the dust settle for 6 months and then do it. If the hiccup doesn't affect your use of the rig, why worry?

Jack, W8TEE

On Wednesday, December 18, 2019, 8:26:08 PM EST, Steve Sawicki via Groups.Io <ab2et=yahoo.com@groups.io> wrote:


Tony,
Being around when the "Wireshark software" was changed/modified  on a hourly basis is this what we can expect of V6?
I put in my order for the V6 kit a coupl of days ago with the hope that I would not have to start the whole compile system again,at least for some time (like 6 months) until the whole Win7 closeout and switch to a stable Win10 occurs..
Best Regards.
73's
Steve
AB2ET/4

--
Jack, W8TEE

Re: V4 TX problems and new finals #ubitx-help

Anthony Gomes
 

Looks cool Dan, If I remember correctly Farhan had the same Tektronix 465 model during his initial "phonestack.com" days, not sure if he is still using it, Raj may be aware of that.

Anthony
VU3JVX

Re: V4 TX problems and new finals #ubitx-help

Don - KM4UDX
 

And after you all made me feel very inadequate (not really, that is my wife's job) about my lack of "real" test gear, here is a picture of my very good technical guru Dan (W3BU) Techtronics scope, right next to my uBITX.  Dan gave me the scope (thank you Dan!!).  I didn't get to use it on this go round, but I'll learn how to turn it on soon. So I can be ready for the next stupid thing up my sleeve...hahah. 

Note the wood flap over the uBITX.  That is the underside of my AtomicPi single board computer -- now integrated with a USB hub into  the uBITX. Death to laptops!  My uBITX has a fully functional unix (Lubuntu) little Pi type embedded computer.  It is totally self contained for all digital modes, and I can do my email and waste time, as well.  Thank you uBITX!!

Re: V4 TX problems and new finals #ubitx-help

 

Harrr! Congrats Don! make mine a Bud !

I nominate you the next script writer for Star Wars.

From your pic of IRFs - keep each heat sink from touching the other. If they touch you will not have fireworks but simply NO OUTPUT
power! They look dangerously close! Probably they were touching!

I recommend a larger single heat sink and insulation washers and mica or rubber for IRFs, then no need for fans.


Cheers
Raj

Emacs!


At 19/12/2019, you wrote:
Evan, Jerry, Mark, Raj, Anthony, & Co.  First a million million thank yous. I'd buy you all a beer or three. If you ever make it to little Vienna VA, I'm good for it. hahaha.

I tested the TP7->TP8 for continuity, checked r97/r98, examined the "functional integrity" of the RV2 & RV3 (I looked at them with a serious expression), did the bias setting process about 5 times just to prove that I could get +100ma consistently on each 510, and set the drive pot to produce 10w on 12v on 80m.  Then I tested and tested into my dummy load. I had RF power. YEA!!  With success at hand, I immediately took out the functioning ebay 510s, and replaced them with the real deal Mouser IRF510s. Did it matter? Well, no. But it made me feel better?  And I then did all the checking/bias setting over again. I still had RF power, even with the new new 510s.  [I got 10...just saying]

Then I moved up to +15V on the brown wire. I got more power. Then +20V.  And I got even more power. I was mad with power! How much power you ask? 30W on 80m. And the spectral purity is only sort of marginal. hahaha.  I keep it below 30w...mostly...I try to keep it down...really I do...but sometimes...I ...just...can't...help...myself....ahhhhh.

I felt like Dr. Frankenstein..."it lives!!!"

The hormonally excessive large heat sinks got thermal switches to drive fans. The case got cut to hold the fans. Power was supplied to the fans. I was ready to conquer the world!
[] []

Except the fans didn't really work.  The thermal switches were "on" all the time, the fans even with soft mounts made a racket, and the stupid fans would clog every time I hit TX.  And then they died. Maybe cause I paid $1.99 per fan?

So I need to redo all the fan business.   And I didn't think to test the thermal switches ahead of time. Normally open? Normally closed? hun? what? Such an idiot.

But, back to the gorgeous heaven sent RF of life. The results?  WSPRnet says I am getting out to the world! It lives!!
[]
So with the awesome power comes awesome responsibility. And the PC crashes on 30m where the antenna SWR is a bit "sub optimal" aka near infinite. So I'm adding ferrite beads everyplace, improving grounding, and finally turning down the drive on 30m.

Still with me?

Well thank you all so very much. I owe ya.

If I were more in touch with inner myself (which actually sounds a bit repulsive, when you think about it),
I'd say I love ya, but really, that sounds a bit much.

Don
km4udx

Re: V4 TX problems and new finals #ubitx-help

Anthony Gomes
 

Great job Don and thanks for sharing, nothing feels better than able to fix something yourself.

73
Anthony
VU3JVX