Date   
Re: uBITX woes, feeling disheartened. #ubitx

 

Now the readings looks normal!

At 12-02-2018, you wrote:
ok how about these readings; K1 Rec. pin1=0volts pin3=12volts pin5=12 volts pin =8 12 volts pin9=12 volts pin12=0volts pin14=0volts pin16=0 volts K1 Trans pin1=12 pin3=0volts pin5=12volts pin8=12volts pin9=0volts pin12=0volts pin14=0volts pin16=0 volts K3 Trans. pin1=0 volts pin3=0 volts pin5=0 volts pin8=12 volts pin9=0 volts pin12=0 volts pin12=0 volts pin14=0 volts pin16=0 volts KT1 Trans. pin1=0 volts pin3=0 volts pin5=0 volts pin8=12 volts pin9=0 volts pin12=0 volts pin14=0 volts pin16=0 volts KT2 Trans. pin1=0 volts pin3=0 volts pin5=0 volts pin8=12 volts pin9=0 volts pin12=0 volts pin14=0 volts pin16=0 volts KT3 Trans. pin1=0 volts pin3=0 volts pin5=0 volts pin8=12 volts pin9=0 volts pin12=0 volts pin14=0 volts pin16=0 volts. VOM Black to Antenna Ground Red to pin being tested. hope this is good readings 73's de AC8XZ

Re: Blown by nearby transceiver #bitx40help

 

Jerry,

Looks the L and C formed a series resonant circuit at the transmitted frequency.

Raj

At 12-02-2018, you wrote:
From the photo, looks like a burned trace from C6 to L3.
From the Bitx40 schematic it's hard to imagine how that might have happened.

Re: uBITX woes, feeling disheartened. #ubitx

 

Thats not OK.. your rx will not work!

Switch off power and check the contact continuity as per table I sent you!

At 12-02-2018, you wrote:
make that K1 Rec. pin3=0 volts sorry 73's de AC8XZ

Re: Blown by nearby transceiver #bitx40help

Jerry Gaffke
 

Possible.

Do we know what the transmitted frequency was?  Was it 40m?
I figure the series loop of L3,C6,C7,C5 to be resonant at 7.45mhz,
    C-total-in-pf = 1/(1/1000 + 1/470 + 1/100) = 76pf
    F-resonance =  1/(2*pi*sqrt(L*C)) = 1/(6.28*sqrt(76e-12 * 6e-6)) = 7.46mhz
Loading from C4,C11,C41 will likely bring that down a bit in frequency.

I'd be looking at the base and emitter DC voltages of Q1 (during receive) and,Q13 (during transmit)
to see if they got blown.  Compare to Randy's chart as previously suggested by Marco: 
    https://groups.io/g/BITX20/files/K7AGE/BITX40%20Voltage%20Measurments.pdf
If  Q1 got blown, then also check Q4.

I am still quite surprised that enough energy got coupled in to blow the trace. 
The traces do form a moderately large loop, a single turn inductor, perhaps that was all it took.
Or perhaps those toroids are not as self shielding as I had figured.

Jerry, KE7ER


On Sun, Feb 11, 2018 at 08:27 pm, Raj vu2zap wrote:
Looks the L and C formed a series resonant circuit at the transmitted frequency.

Re: wrong frequency after software change. #ubitx

at91r40008
 

Thanks Jack. I missed that one.
It still doesn't show me the exact location of my project.
The problem is only I open more than one project at a 
time for comparison.
From now on when I download a project I'll rename it
immediately and insert a note where it is coming from.

--
73, Yvon NU6I

Re: wrong frequency after software change. #ubitx

at91r40008
 

Thanks Ron. 
Never too old to learn something new. And be embarrassed that it was in my face.
--
73, Yvon NU6I

Re: Bitx40 - receiver works great, but do not transmit #bitx40help

Ivan Ilyichev
 

Thank you for answers. I have a lot of good germanium detector diodes D9B (full analogue of 1N34A). At evening i try to built a RF probe and measure output power.
Also i try to check toroid trifillar transformers - they bother me to.

Re: Lost audio from receiver

Lawrence Galea
 

On Sun, Feb 11, 2018 at 10:46 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
I think you're right, probably blew the LM386.
And nothing else.

Clipping leads and just leaving them in place sounds fine, or could 
heat them up and pull them out one by one using soldering iron and needle nose pliers.
I would not bother trying to suck the solder out of all those holes, just snip the bottom half of the legs off the new part
and solder it to the surface of the board.

An alternative is to buy some LM386 amp kit, and wire it into the existing volume control pot:
    http://www.kitsandparts.com/audioamp386v2.php


On Sun, Feb 11, 2018 at 12:52 pm, Vic WA4THR wrote:
After some other testing on a BitX40 that was working well, it is likely that 12v (or even 24v) touched one of the speaker leads. Now I have essentially no audio out from the radio. On very strong signals and at maximum volume I can hear a weak and very distorted sound out of either the speaker or a separate speaker/mic, but it is not copyable and only just recognizeable as a signal. Listening on another receiver and watching the output, transmit seems fine. It sounds clear and undistorted and the power out is pretty normal. I checked the voltages around Q16 and they are exactly as expected in receive and transmit. The suspicion to me is that the LM386 has "blown", but there are no obvious marks on the board on any components. Is there someplace else I should look before trying to replace that chip?

As to technique for repairing that IC, if it is the problem, I seem to recall a method that involved just cutting the legs off and soldering them to a new chip. Is that a viable way to go?

While I've never owned a barrel of monkees, it  is hard to imagine that could be more fun than the BitX, but I do seem to get myself in trouble playing with it.

=Vic=


#bitx40help Probably need new Raduino #bitx40help

Kevin Luxford
 

Yep I think I did it.  I applied reverse polarity to my BITX40 from HFSignals.  The power to the board was connected but no power to the PA.  (The connector I used had the positive connected to the outside and the negative to the central - was for an odd piece of test gear I used years ago).  Anyway, correcting the connector results in no sign of life on the display.  Reading through the posts, it would appear that I may well have bricked the raduino.  Hence I would like to contact Mike Hagen to enquired about his improved raduino.  So could Mike please contact me off list so we can discuss features, costs etc.  And the irony is that components toprotect against reverse polarity are on order but have not yet arrived. vivimus atque discimus.

Re: #bitx40help Probably need new Raduino #bitx40help

 

Amici curiae will tell you that probably nothing happened.

You would have had a smoking gun: D7 - in B40 that part dies first, so please check if it has fried and then the rest..

What was the power supply?

Raj

At 12-02-2018, you wrote:
Yep I think I did it. I applied reverse polarity to my BITX40 from HFSignals. The power to the board was connected but no power to the PA. (The connector I used had the positive connected to the outside and the negative to the central - was for an odd piece of test gear I used years ago). Anyway, correcting the connector results in no sign of life on the display. Reading through the posts, it would appear that I may well have bricked the raduino. Hence I would like to contact Mike Hagen to enquired about his improved raduino. So could Mike please contact me off list so we can discuss features, costs etc. And the irony is that components toprotect against reverse polarity are on order but have not yet arrived. vivimus atque discimus.

Re: BITx 40 Frequency lock during transmit

Vic WA4THR
 

I agree on changing to Allard's code. It is a wonderful improvement to all aspects of the BitX40 and works even without any hardware mods. Loading a new sketch is easy. I had no experience with Arduinos or anything like that and following the "Raduino Software for Geezers" instructions (Google it) I was able to upload and experiment with changes to the sketch. For best results you'll need at least one pushbutton switch to get access to the function menu, and make one small addition running a connection from a well-illustrated location back to the Raduino so it will know when you are in transmit, but those changes just add features like being able to scan, switch VFOs, work split, etc., and the sketch will work better than the OEM sketch right out of the box with no changes at all.

As another aside, for guys just building their BitXs. Look where the USB port is on the Raduino. Almost every build I see puts the tuning pot right in front of it so you can't get at it to change software. Mount the Raduino to the right (facing) side of your front panel and you'll have easy access to the port and have as much fun playing with sketch changes as with other aspects of the rig.

=Vic=

Re: BITx 40 Frequency lock during transmit

David Robertson <kd1na363@...>
 

Thank all of you for the information.
73

--
Dave Robertson KD1NA

RadI2Cino - I2C replacement for the uBITX Raduino #ubitx

Jim Sheldon
 

Announding the RadI2Cino (prounounced "Rad ee too CEE no", an almost "Drop In" replacement for the original uBITX Raduino card.
The attached PDF file contains the complete information on it but here is a summary of the changes/enhancements incorporated in the
RadI2Cino from the original Raduino.

I2C is used so the 16 pin LCD display header has been eliminated.
The LCD display contrast pot has been eliminated.
The 16 pin and 8 pin uBITX headers are retained and connect in the original fashion.
Arduino NANO I/O pin assignments have been rearranged to free up digital and analog I/O pins.
     a) D8, D11, D12 now used for key, paddles, and PTT.
     b) D10 used for an A/B split selection button.
     c) D9, D13, A3, A6, A7 now available for other needs.
The LCD display is operated via an I2C bus connection.|
     a) Contrast control is now part of I2C interface "backpack".
     b) Larger, 4-line displays are supported.
The TO-220 5 volt regulator has been replaced by a surface mount 7805 1 amp regulator.
A surface mount 3.3 volt regulator has been added.
A 4-pin header has been added to give access to the I2C bus.
A logic level translator has been added to the I2C bus to protect the Si5351 clock chip.
Manufacturer-recommended RC de-bouncing for the rotary encoder phases has been added.
Provision is made for an optional dropping resistor to reduce regulator dissipation.
Several powering options are provided, selected by shorting jumpers.
     a) power everything through the NANO via the uBITX +12V rail**
     b) power the NANO from the uBITX +12V rail, and the rest via the 5V regulator**
     c) power everything from the board mounted 5 volt regulator.
     d) power the Si5351a from the NANO's 3.3 V output.
     e) power the Si5351a from the on-board 3.3 V regulator.
Though the PC board is slightly longer, mounting holes compatible with the LCD display are retained.
An additional 8 pin header is added for access to the newly free I/O pins.
Uncommitted PCB pads are provided to connect serial I/O and NANO Reset.
NANO mounting pads are intentionally oversized to allow for a low profile, machined pin, socket for the Nano.
Heavy use is made of silk-screened labels to identify signals and functions.

 ** If the optional dropping resistor is not used DO NOT EXCEED 12V when using these power options.

Re: Raduino seperate

LKNDAVE
 

I HAVE always wondered why, guys that do pcb layouts the dont add slightly longer pads with thru holes to dually accomodate smd 0805 OR 1/8 was resistors and 5 mm caps.
dave N4LKN.

Aluminum enclosure

John KC9OJV
 

I ordered one of these: https://www.hammfg.com/part/1402D
I'm hoping I can work with the height of the Raduino OK.

John
KC9OJV

Re: Aluminum enclosure

John KC9OJV
 

For the uBitx

Si5351mcu library update

Pavel Milanes Costa <pavelmc@...>
 

Hi OM.

I have re-worked on my lib for the Si5351, I have a few new features in there, if you like to peek you can check the code in github

https://github.com/pavelmc/Si5351mcu

Comments, critics, error spotting are welcomed.

Features

This are so far the implemented features (Any particular wish? use the Issues tab for that):

  • Custom XTAL passing on init (Default is 27.000 MHz (See Si.init() )
  • You can pass a correction to the xtal while running (See Si.correction() )
  • You have a fast way to power off all outputs of the Chip at once. (See Si.off() )
  • You can enable/disable any output at any time (See Si.enable(clk) and Si.disable(clk) )
  • By default all outputs are off after the Si.init() procedure. You has to enable them by hand.
  • You can only have 2 of the 3 outputs running at any moment (See "Two of three" section below)
  • Power control on each output independently (See Si.setPower(clk, level) on the lib header)
  • Initial power defaults to the lowest level (2mA) for all outputs.
  • You don't need to include and configure the Wire (I2C) library, this lib do that for you already.
  • Frequency limits are not hard coded on the lib, so you can stress your hardware to it's particular limit (You can move usually from ~3kHz to ~225 MHz, far away from the 8kHz to 160 MHz limits from the datasheet)
  • NEW: You has a way to verify the status of a particular clock (Enabled/Disabled by the Si.clkOn[clk] var)
  • NEW: From v0.5 and beyond we saved more than 1 kbyte of your precious firmware space due to the use of all integer math now (Worst induced error is below +/- 2 Hz)
  • NEW: Overclock, you can move the limits upward up to ~250MHz (see the "OVERCLOCK" section below)
  • NEW: Improved the click noise algorithm to get even more click noise reduction (see Click noise free section below)
  • NEW: Fast frequency changes as part of the improved click noise algorithm (see Click noise free section below)

73 Pavel CO7WT

Re: Aluminum enclosure

Randy
 

6" x 6" is what it needs (for a very very tight fit). At least 2-1/2" inches if you are on standoffs. The stand-offs are 1/2 inch, the display is another 1-3/4 inch above the PCB.

Re: uBITX woes, feeling disheartened. #ubitx

rlawson695@...
 

Ran :  does rx mean receive, if it does? The radio has been  reviveing the last four weeks  very good hearing  stations all over the world.  73’s de AC8XZ 

Re: Second batch of uBITX shipping? #ubitx

S. Porter <srporter@...>
 

Art,

Just got off the phone with a DHL rep who said DHL will deliver here, not USPS. Your mileage may vary. The package is on the move again this morning! :-)

73,
Steve


On Sat, Feb 10, 2018 at 04:08 pm, Art Howard wrote:
I also ordered mine on the 18th and mine is also sitting in Cincinnati for the last day.
 It is indicated that once it hits the USA it is USPS. Was supposed to deliver this last Friday so I figure maybe Tuesday here in Minnesota.