Date   
Re: Blown by nearby transceiver #bitx40help

AC9NM - Jerry Ponko
 

Arv,

Shielding, whether it's tin foil, copper, steel or aluminum forms what is called Faraday cage invented by Michael Faraday. When an outside electromagnetic (EM) wave encounters a Faraday cage its electric field induces a field in the cage which causes them to cancel. So the only requirement for the Faraday cage to work is that the material used be conductive. The cage doesn't have to be solid. For example, you may have seen power supplies, etc. covered by extruded aluminum or steel screening which will work as long as the holes are much smaller than a wavelength of the signal of interest. I myself use oak or birch enclosures lined with aluminum tape like the kind used for the joints of heating/cooling ducts. For the front panels I use 1/8" plexiglass with a laser printed sheet for panel markings. I'll have to post a photo someday of my BITX40 case as an example. I can't see myself paying the prices charged for aluminum or steel enclosures that cost as much as the BITX and you still have to do the cutouts for the controls and the panel markings.
JP

Re: Raduino Replacemnt, COMING SOON!

Nick VK4PP
 

Ebay Prices:
VK4PLN RadinoI2C : $8
LCD + Backpack : $3
Si5351 : $8
Arduino: $4
+bits : $2
= $25, not too bad.

73, VK4PLN

Re: Raduino seperate

Glenn
 

One reason for not doing that, is you might have a lot of parts on the other side also.  To dual footprint smd and through hole, means the smd pads need to be double sided with a thru hole. So taking up space on the other side.

Another reason is that in many pcb packages, the pcb has to be the same as the Schematic. Which means every part you wish to dual footprint needs to have two parts on the Schematic where required. Or to avoid this, every part needs  a special PCB dual  footprint in the Library.

glenn

vk3pe



Virus-free. www.avast.com

Re: Raduino Replacemnt, COMING SOON!

Nick VK4PP
 

Added bonus is that the SI5351 board uses 5v logic levels and has the shiters build in for the Si5351 chip.
Now the LCD I2C backpack can be used without modification. No reliance at all on the arduino 3.3v regulator.
Splice in an I2C TPA2016 AGC Amp and you are cooking!
73

Re: wrong frequency after software change. #ubitx

Mike Woods
 

Michael

I suspect I may have slightly misread your email post. 

You have a uBITx not a BITx40?

Is your Raduino 400kHz off frequency (or did you mean 400Hz)?   It does sound like it could be a similar problem to Yvon's if it is 400kHz off frequency and the LSB/USB are backwards! i.e. the EEPROM has become scrambled.  However, reinstalling the stock firmware should fix that.  If it doesn't the EEPROM may in fact be damaged in the Nano. It is possible there is something really wonky with your replacement Raduino: either the Nano chip (most likely) or the SI5351a chip.

Mike ZL1AXG


On 13/02/18 6:27 AM, Michael Shreeve wrote:
Another strange twist which may be related. I changed a BITX40 rad to uBITX Raduino. Hardware change, you remove the 5 pin plug and put a header in its place. I really looked hard for any other differences in Hardware. Saw none. So, I programed with original software. Crazy, but LSB is USB on 80 and 40 (up to 10mhz) and other than that, seems stable and might be on freq. So, I tried Ians latest 1.01 and LSB is correct, USB is correct, have control also, but freq is off about 400khz. So, found an EEPROM WIPE routine, says it works for all size eproms, and did the wipe. No luck. Still off, I re-loaded the original Ashhar software stil backwards. Thinking I would need to use memory manager but not sure I have the skills. Any ideas ? 

_._
--
Mike Woods
mhwoods@...

Re: AGC kits

Joe Puma
 

Okay I spent some time trying to understand the change. You sent 10k (103) resistor tapped to the paper.  Replace that with the 100k (1000) near the input and that’s it right. Okay I will make the change soon

Thanks,
Joe
KD2NFC 



On Feb 8, 2018, at 9:31 PM, N8DAH <Dherron@...> wrote:

I would love to show you the real board but I sold them all

As posted in the original sale thread here is the site where all this came from: AGC

10k is on the IN 100k to GND right after the .1uf cap next to the 2n3904.

 

 

<agc.png>
--
David

 N8DAH
Kit-Projects.com

Re: Raduino Replacemnt, COMING SOON!

William R Maxwell
 

AUD or USD, Nick?

Bill, VK7MX


On 13/02/2018 3:49 PM, Nik VK4PLN wrote:
Ebay Prices:
VK4PLN RadinoI2C : $8
LCD + Backpack : $3
Si5351 : $8
Arduino: $4
+bits : $2
= $25, not too bad.

73, VK4PLN

Re: ubitx project

Andrés Moreno
 

Of course, Mike.
But first I have to "clean it up" and translate comments, because they are in Spanish. I will start doing that and  I think I can offer the open source sketch for those who want it in a few days.
73 Andrés EB7ME

Re: Raduino Replacemnt, COMING SOON!

Gerry Kavanagh
 

Nice work Nik. I will be ordering as soon as they become available.
For v2, could you think of breaking out the unused analogue pins?

/ Gerry

Re: Raduino Replacemnt, COMING SOON!

chris gress <Chrisg0wfh@...>
 

For us with no PC can we get them pre programmed that would be a big  help chris

On 13 Feb 2018 11:48, "gerrykav via Groups.Io" <gerrykav=yahoo.co.uk@groups.io> wrote:
Nice work Nik. I will be ordering as soon as they become available.
For v2, could you think of breaking out the unused analogue pins?

/ Gerry

Re: Raduino Replacemnt, COMING SOON!

KC9SGV <kc9sgv@...>
 

Will it work with the Allard sketches ?

Bernie,
KC9SGV


On Feb 11, 2018, at 7:07 PM, Nik VK4PLN <nickpullen@...> wrote:

Hi Group.

I am working on a simple "Open source" Raduino replacment board: see here:
https://easyeda.com/nikpolini/Raduino-1b3e0cb579154514ad2e014b83346b58

It will use the Adafuit Clock board: https://www.adafruit.com/product/2045
So will run all devices at 5v.
I hope to have pinouts and dimension exactly the same as the origional so it can be used as a direct drop-in replacement. Or modified for i2c display and other GPIO mods...
Should be cheap (.50c a board, $3 nano, $8 Si5153 board plus a 7805 regulator and a few other bits... I'll try make it both SMD and TH for the capacitors and resistors...
So you can build a cheap easy <$20 Raduino replacment....

Constructive comments and thoughs welcome.

73. Nik
VK4PLN

uBitX - problem with power draw and failed chip

Michael Aiello
 

Hello,

I just received my uBitX and started wiring it up per the instructions. I wired up the power connector with the diode installed, and measured the draw from the main board, and it was high: 140 ma. Then there was a loud crack - it appears the TDA2822 chip cracked.
After the chip failed, the board is drawing a steady 82ma.

I have found a local source for the TDA2822M and have ordered a few parts. I will replace the chip, but here is my question: 
what else should I be checking on the board?
Is there a list of test points and volages to check? I'm just concerned that the chip failure was caused by some other issue on the board.

The only other out of the ordinary thing I noticed was that the bolts holding the heat sinks on the finals were loose. I tightened them before starting the assembly.

Thanks for any help or suggestions

73, Mike N2HTT

Re: Raduino Replacemnt, COMING SOON!

KC9SGV <kc9sgv@...>
 

Maybe you should donate one of these replacement boards to Allard so that he can modify his latest sketches for it ?
Will mean more sales for you...

KC9SGV


On Feb 13, 2018, at 6:14 AM, KC9SGV <kc9sgv@...> wrote:

Will it work with the Allard sketches ?

Bernie,
KC9SGV


On Feb 11, 2018, at 7:07 PM, Nik VK4PLN <nickpullen@...> wrote:

Hi Group.

I am working on a simple "Open source" Raduino replacment board: see here:
https://easyeda.com/nikpolini/Raduino-1b3e0cb579154514ad2e014b83346b58

It will use the Adafuit Clock board: https://www.adafruit.com/product/2045
So will run all devices at 5v.
I hope to have pinouts and dimension exactly the same as the origional so it can be used as a direct drop-in replacement. Or modified for i2c display and other GPIO mods...
Should be cheap (.50c a board, $3 nano, $8 Si5153 board plus a 7805 regulator and a few other bits... I'll try make it both SMD and TH for the capacitors and resistors...
So you can build a cheap easy <$20 Raduino replacment....

Constructive comments and thoughs welcome.

73. Nik
VK4PLN

Re: Si5351 Programming Flowchart

KC9SGV <kc9sgv@...>
 

Hi Brian,
I am very interested in your HAB project.
I want to do the same.
Please forward me some details, links, etc.

I have been following Andy in Australia with his solar panel Mylar party balloon clusters.
Even set up a listening node on 30m for him here in Chicago.

$20 to track a 70,000 ft floater...
I can do that !

Bernie DeKok
KC9SGV

On Feb 12, 2018, at 7:16 PM, B C <k9wis@...> wrote:

there is a windows program on the adafruit website that will give you the parameters after you enter the frequency..I am using a nano($3) and one of the adafruit si5351break out boards($8) with a low pass filter9$5) for a QRSS 20mW xmtr I plan to release with a balloon..total cost under $20
Brian K9WIS

---- Pavel Milanes Costa <pavelmc@...> wrote:
Hi to all.

The flowchat is a instructive guide for the curious of how to doit
without float point math and an expression of the KISS principle.

It's just a cheat sheet to learn from.

The trick is to understand the way he (like Gerry) find a, b and c not
needing floating point math. (for the PLL/VCO Msynths case is)

a = int(Fvco/xtal)

b = Fvco % xtal (module, aka: rest of the division)

c = xtal

For example Gerry do a do..while to find a value of b/c that match the
allowed size of c, he need it because he is working with the output
Msynth dividers not the PLL/VCO Msynth, in his case c = fout and is
variable.

In the later case (moving the PLL/VCO Msynth, output Msynth dividers are
fixed) c is fixed and equal to the Xtal and we know it already then we
can do a simple x >> 5 to both b/c to retain maximum accuracy and make
it fit on the register. If we do that just set the output Msynth divider
to a integer & even value to minimize jitter or phase noise.

In Gerry routines he fixes the VCO and moves the output divider Msynth
and that make some jitter or phase noise (almost negligible in real
applications, I know) and makes 3 outs from just one fixed VCO and does
not handles the R values or the DIV_BY4 feature limiting the full range
of output frequencies (not needed on his target application, I know).

This is just another way of doing things, a way that can be better
understood because it uses a simple and elegant image (flowchart), to
make life (& code) easier (& smaller)...

BTW I found a possible bug that can haunt more than one in the routines
of computing MSx_P2. A tip for the "math" experts... and a common fault.

As per the data:

MSx_P2 = 128 * b - c * floor (128 * b / c)

Right?

It's very tempting to reduce it but the floor functions is in there...
let see... floor is the lower integer for that float number, hum...

Floor is on the C of Gcc the compiler used by the arduino project but it
implies the use of floating point math hence bigger code, just eliminate
it and do the math, let try to reduce it...

MSx_P2 = (128 * b) - (c * 128 * b / c)
MSx_P2 = (128 * b) - (128 * b) ---> (c is eliminated as it's * and / in
the expression)
MSx_P2 = 128 * (b - b) ---> ( hum....)
MSx_P2 = 128 * 0 ---> (HUMMMM!!!)
MSx_P2 = 0 ---> (WTF !!!!)

Doing some math and wall head-hiting you can conclude that the floor
function is instructing you to IGNORE the use of fractions and then you
get a value in MSx_P2 that it related to the amount of error or rest of
division of doing things (math) with integers... hence the floor
function... forcing you to use just integers... nice.

For example Gerry users in his code this:

msxp2 = 128 * msb - 128 * msb / msc * msc;

If you play that same function with human and integer rules it play well
and result is different from zero, but if you use floating point math it
always equals to ZERO!

Let's play it with me in full integer math

let's say msb = 900 and msc = 1000

msxp2 = 128 * 900 - 128 * 900 / 1000 * 1000;
msxp2 = 115200 - 115200 / 1000 * 1000;
msxp2 = 115200 - 115 * 1000; // <<<<=== here is the floor in action
(result in float is 115.200 we get it down to 115, all with the magic of
integer math)
msxp2 = 115200 - 115000;
msxp2 = 200;

In this case 200 is a relation of the error of using integer math...
interesting, mind you how the chip use it internally

For correctness and just to be sure to maintain the best accuracy you
must get sure the compiler do the 128*b/c * c in the correct order, that
is as per Gerry code fragment:

msxp2 = 128 * msb - 128 * msb / msc * msc;

Must be forced to execute in the correct order by placing some
parenthesis to maintain more accuracy.

msxp2 = 128 * msb - ((128 * msb) / msc) * msc;

Firmware size impact is unchanged, compiled code is the same (sha256sum)
with and without the parenthesis so GCC compiler is doing he job right,
beware of others...

I mentioned this because I have a ham fellow in university (freshman)
that hit his head against this wall a few times, "that's impossible,
that has no sense.... MSx_P2 is always zero..." he said...

Just my two cents for other that may be in troubles like this
understanding the chip.

Cheers, Pavel.

El 12/02/18 a las 12:07, JuanCarlos Berberena Gonzalez escribió:
Hi Guys
A weeks ago Josué Marin-CO7RR- sent me this information to share with
my group.
I am only try to be a good 'USER" testing some interesting project I
can get on the web and afterward share it with my group.
Now Pavel-CO7WT- sent me this link and I think is a good idea to share
with all of you.
https://nt7s.com/2018/02/si5351-programming-flowchart/

It is a Josué Marin email address
marinjosue75atgmaildotcom
Qrv's
73's Jc


Re: uBitX - problem with power draw and failed chip

 

Mike,

That may happen if power supply voltage was too high.

The chip may have been soldered wrongly - please check.

2822 is a very tough chip, I have melted a breadboard but the chip survived.

Raj

At 13-02-2018, you wrote:
Hello,

I just received my uBitX and started wiring it up per the instructions. I wired up the power connector with the diode installed, and measured the draw from the main board, and it was high: 140 ma. Then there was a loud crack - it appears the TDA2822 chip cracked.
After the chip failed, the board is drawing a steady 82ma.

I have found a local source for the TDA2822M and have ordered a few parts. I will replace the chip, but here is my question:Â
what else should I be checking on the board?
Is there a list of test points and volages to check? I'm just concerned that the chip failure was caused by some other issue on the board.

The only other out of the ordinary thing I noticed was that the bolts holding the heat sinks on the finals were loose. I tightened them before starting the assembly.

Thanks for any help or suggestions

73, Mike N2HTT

Re: uBitX - problem with power draw and failed chip

Michael Aiello
 

My supply voltage was 13.8, is that too high? That is nominal 12v supply.

I will check the chip 
orientation before replacing the 

Thanks 
Mike




On Feb 13, 2018 8:07 AM, "Raj vu2zap" <rajendrakumargg@...> wrote:
Mike,

That may happen if power supply voltage was too high.

The chip may have been soldered wrongly - please check.

2822 is a very tough chip, I have melted a breadboard but the chip survived.

Raj


At 13-02-2018, you wrote:
>Hello,
>
>I just received my uBitX and started wiring it up per the instructions. I wired up the power connector with the diode installed, and measured the draw from the main board, and it was high: 140 ma. Then there was a loud crack - it appears the TDA2822 chip cracked.
>After the chip failed, the board is drawing a steady 82ma.
>
>I have found a local source for the TDA2822M and have ordered a few parts. I will replace the chip, but here is my question:Â
>what else should I be checking on the board?
>Is there a list of test points and volages to check? I'm just concerned that the chip failure was caused by some other issue on the board.
>
>The only other out of the ordinary thing I noticed was that the bolts holding the heat sinks on the finals were loose. I tightened them before starting the assembly.
>
>Thanks for any help or suggestions
>
>73, Mike N2HTT





Re: uBitX - problem with power draw and failed chip

 

Mike,

The voltage is fine, something else blew it. Chip cracking mean catastrophic failure..

Check for solder bridge short etc.. these boards are checked before they are sent out.

Raj

At 13-02-2018, you wrote:
My supply voltage was 13.8, is that too high? That is nominal 12v supply.

I will check the chipÂ
orientation before replacing theÂ

Thanks
Mike

Re: uBitX - problem with power draw and failed chip

Michael Aiello
 

Okay thanks Raj. It will bed a few days before I get the new chips, I'll review the board  
73 Mike N2HTT 

On Feb 13, 2018 9:31 AM, "Raj vu2zap" <rajendrakumargg@...> wrote:
Mike,

The voltage is fine, something else blew it. Chip cracking mean catastrophic failure..

Check for solder bridge short etc.. these boards are checked before they are sent out.

Raj

At 13-02-2018, you wrote:
>My supply voltage was 13.8, is that too high? That is nominal 12v supply.
>
>I will check the chipĀ
>orientation before replacing theĀ
>
>Thanks
>Mike




Re: uBitX - problem with power draw and failed chip

 

Mike,

Now break the 2822 and remove the pins one by one. Put in a socket.
If everything looks alright then you can get audio from the volume control top lead
and listen on an ampli speaker.

Raj


At 13-02-2018, you wrote:
Okay thanks Raj. It will bed a few days before I get the new chips, I'll review the board Â
73 Mike N2HTTÂ

On Feb 13, 2018 9:31 AM, "Raj vu2zap" < rajendrakumargg@...> wrote:
Mike,

The voltage is fine, something else blew it. Chip cracking mean catastrophic failure..

Check for solder bridge short etc.. these boards are checked before they are sent out.

Raj

At 13-02-2018, you wrote:
>My supply voltage was 13.8, is that too high? That is nominal 12v supply.
>
>I will check the chipĀ
>orientation before replacing theĀ
>
>Thanks
>Mike

Re: Raduino Replacemnt, COMING SOON!

Jerry Gaffke
 

Should work fine with Allard's sketches.
I believe with no modifications to the sketch if using a standard parallel display.
Not a bad idea to move to an i2c display to free up some pins,
but that is a very minor adjustment to the code and has been done here before.

Looks like it's fully compatible regarding form factor and connector placement as the one from hfsignals
Good job Nik, addresses a need, and using the adafruit si5351 breakout makes it an easy build.

Jerry, KE7ER


On Tue, Feb 13, 2018 at 04:15 am, KC9SGV wrote:
Will it work with the Allard sketches ?