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 boardĀ Ā
73 Mike N2HTTĀ

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

I will be gone for an extended time when my DHL ubitx arrives. If a signature is required does anyone have a suggestion to get my hands on it.  Neighbors are too remote.

Bill

Hey Mike,

I know why it didn't work, it doesn't glow in the dark:-) No seriously folks, that's a bummer. The TDA2822M's speaker output is not referenced to ground and must be isolated from ground. It's a BTL amp. I toasted one first time I used it because I didn't know this. Just a thought.

Joel
N6ALT

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@...

I'm sure there is a less mystical answer to this. I still think its something to do with software as it was working perfectly in a BIXT40 before I put the header in it so as to use it for a uBITX. But, you never know, maybe I missed a little solder jumper or something on that order. Still checking (again, with a microscope , 20power, this time. On a laptop screen.) But, I've checked my work, its very methodical and switches at 10mhz to lsb. Which leads me to really wonder about the possibility of one bit being off. I had read that one bit is changed (by the original)

On Mon, Feb 12, 2018 at 9:50 PM, Mike Woods <mhwoods@...> wrote:

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@...

--

Michael Shreeve N6GRG
15901 Cloverdale Road
Anderson, CA 96007
530-410-8678
"Don't worry about a thing, 'Cause every little thing gonna be all right!" -Bob Marley

I was replaced Q9 with a new MMBT3904 and now it seems to be ok with my Bitx40. For final transmission testing i build a simplest direct-conversion receiver on SA612 + LM386. I hear myself good, without distorsions. Now - going to air.