Date   
Microphony

Peter Russell <peter.russell@...>
 

Cured!
turned out to be C50 in the audio pre amp.
replaced it with a leaded electrolytic.

A little tip - for those who need it!
If you know that you are going to replace a smd capacitor or resistor, I find the easiest way to remove them is to take a pair of small cutters and cut the component in half.
Then, with a pair of tweezers, it's easy to unsolder the two ends.

Peter G8FWY

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Rotary encoder

Peter Russell <peter.russell@...>
 

Another little problem.
I'm finding that the rotary encoder is generating quite a bit of noise.
I can hear every 'tick' when I turn it.
Is this normal, or have I got a bad un?

I don't have any experience of rotary encoders, but this one seems a bit 'flimsy'.
I would have expected something a bit more substantial - or is this just me being a bit picky?

Peter G8FWY

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Re: Rotary encoder

Curt
 

Peter

The encoder is reasonable for its job. I sense it is okay. The action of the encoder seems to be generating noise, that receiver is picking up. It could he s missing solder joint related to a ground connection at the controller IC, or the receiver,  or same on a related capacitor.

Curt

Re: Rotary encoder

Curt
 

Woops wrong list, I was thinking QCX. While these are possible I would question the manual wiring first, it may he a ground connection not connected.

Curt

Re: Bitx40

ae1ct1998 <AE1CT1998@...>
 

The red wire is not grounded, I even put some shrink tubing over the end of it so it won't touch ground. The nano plug in board gets very hot to the touch as well as the 5v reg even after I put a heat sink on it. This radio is only 12 days old and I shouldnt be having these problems with a new radio.


On Tue, Jan 1, 2019, 06:41 Vic WA4THR via Groups.Io <vhklein=ptd.net@groups.io wrote:
If the red wire on the 8 pin plug of the Raduino is grounded the BitX40 will go into calibrate mode. This is true with either the OEM sketch as delivered or with the Amunter sketch. Check that to see if that is why you are always in calibrate mode.

=Vic=

Re: nanos on sale at banggood for $2.39 USD #arduino #nano

John
 

What would be the practical reason for preferring a quartz clock rather than a ceramic resonator?  I get that one is more stable than the other, but in a practical aspect... why would anyone care?   

73
John K5MO

Re: Bitx40

Evan Hand
 

My suggestion is to divide and conquer: 

1 - isolate if the extra power draw is on the Raduino or on the Nano board.  Unplug the Nano from the Raduino and power from a USB connection.  Does the Nano get hot?  if so then you have a bad Nano or short on the board/pins, other wise go to next step
2 - unplug Raduino from the Bitx40 board and the control plug (8 pin with colored wires).  Plug in the Nano and again, power from the USB port on the Nano.  Do either of the boards get hot?  If so, then there is a short or failure on the Raduino board.
3 - next step would be to connect the Raduino to the control plug and verify if the problem reappears.  With this setup you should be able to test the controls, and see if your Raduino jumps right into configuration mode.
4 - next would be to probe the Raduino to Bitx40 connections to find out if there are any shorts to ground that should not be there.
5 - Last would be to provide 12vdc power to the Raduino and verify the 5vdc output of the regulator.  If possible, would be better to do this with the Raduino unplugged from the Bitx40.  I would also remove the Nano for this test.

Arduino Nanos are inexpensive (less than $8 on Amazon in single unit quantities, though the 3 packs are better deals and can be used to swap out "upgrade software" quickly.  Ebay has better pricing)

The above assumes that the Raduino on the Bitx40 that you have is the same as on the uBitx v4 that I have.  If not, then you will need to get help elsewhere, as I do not have that rig.

Please, if anyone else monitoring this thread sees anything wrong with the above, please let us know.

73
Evan
AC9TU

Re: Bitx40

ae1ct1998 <AE1CT1998@...>
 

Yes the nano board get hot, I've unplugged it from the display and the screen is blank, I then plug in the nano and the display says calibrate, I've told As that this but have got any reply as to wether he'll send me a new board. He said try downloading the software but I'm not a software guy and I don't own a computer so that's out.


On Tue, Jan 1, 2019, 10:01 Evan Hand <elhandjr@... wrote:
My suggestion is to divide and conquer: 

1 - isolate if the extra power draw is on the Raduino or on the Nano board.  Unplug the Nano from the Raduino and power from a USB connection.  Does the Nano get hot?  if so then you have a bad Nano or short on the board/pins, other wise go to next step
2 - unplug Raduino from the Bitx40 board and the control plug (8 pin with colored wires).  Plug in the Nano and again, power from the USB port on the Nano.  Do either of the boards get hot?  If so, then there is a short or failure on the Raduino board.
3 - next step would be to connect the Raduino to the control plug and verify if the problem reappears.  With this setup you should be able to test the controls, and see if your Raduino jumps right into configuration mode.
4 - next would be to probe the Raduino to Bitx40 connections to find out if there are any shorts to ground that should not be there.
5 - Last would be to provide 12vdc power to the Raduino and verify the 5vdc output of the regulator.  If possible, would be better to do this with the Raduino unplugged from the Bitx40.  I would also remove the Nano for this test.

Arduino Nanos are inexpensive (less than $8 on Amazon in single unit quantities, though the 3 packs are better deals and can be used to swap out "upgrade software" quickly.  Ebay has better pricing)

The above assumes that the Raduino on the Bitx40 that you have is the same as on the uBitx v4 that I have.  If not, then you will need to get help elsewhere, as I do not have that rig.

Please, if anyone else monitoring this thread sees anything wrong with the above, please let us know.

73
Evan
AC9TU

Re: nanos on sale at banggood for $2.39 USD #arduino #nano

Evan Hand
 

Some of the "birdies" on the uBitx have been suggested as coming from a slightly off Nano clock (either one).  I have not seen that verified.  The other aspect would be how it is used: for the uBittx/Raduino there is not a requirement for accurate time measurements, so as John, K5MO, implied, no real advantage.   

Evan
AC9TU

Re: Ideas for homebrew rig for digital modes on VHF/UHF

Lawrence Macionski
 

FM is allowed in the US above 29.0 Mhz.

Re: Bitx40

Evan Hand
 

So what happens if you unplug the controls connector and power on the rig with it off? Does it still go into calibrate mode?

power and mic wiring

ross ingham
 

Greetins fellow bitx users. Back in the day,1968,  I was a member of the Narrogin radio club and hung out with a bunch of old geezers,one who had a straight six saloon with a back seat that took 10 young blokes. We would build crystal sets and  hang out on the 20 and 6 meatre band. So this is an old guy has retired and getting back into hf radio. I have ordered a microbitx kit and am going through the build in my head . So here are my questions: I intend to put chassis mounted fuses in the power curcuit, do I need to put a fuse on each of the two power feed wires or can I use the same fuse and does the diode stay across from power to ground? Next , I  intend to use four pin mic socket and mic, the blue is ground but if I get the other two wires back to front it be a problem? If someone coule send me a schematic that would make eternally grreatful.
At the moment I am trying to reserect a 1930s Honeywell reciever,some of the valves are not getting hot so I  suspect they are kangeroo edward. I  put up a dipole over Christmas that is ten metres a side, works a treat for my brothers portable on 7.130 but the reciever,nothing. But oh well my othe brother is the valve guy so all good. Cheers and a happy new year. Ross 

Re: My list of mods and Chronology of Installation #ubitx

Daniel Conklin
 

Jerry,
The inductors I used are these:  https://www.arrow.com/en/products/1276as-h-r68mp2/murata-manufacturing
Notice they are shielded 1210 inductors, as recommended. I have read every post on this board before making my choices, and Raj made the recommendations because he tried this fix on several boards with similar results.  He further stated that the Axicom relay fix of the band filters also helps knock down the spurs, which makes sense.
I made this post as a homenaje to those that have done the work to find and test solutions, and as a sort of collection of fixes that I have actually tried.  As I said, I'm happy with the results.  This may encourage someone else, who may be having trouble finding all of the information in the sea of posts, to complete their uBITX and get on the air with it.
73, Daniel  W2DLC

Re: Bitx40

ae1ct1998 <AE1CT1998@...>
 

Which way is the nano board suppose to be mounted, with the nano switch up or down. The first pic is how mine is but all the pics I see it's the opasite. Which way is right


On Tue, Jan 1, 2019, 10:13 Evan Hand <elhandjr@... wrote:
So what happens if you unplug the controls connector and power on the rig with it off? Does it still go into calibrate mode?

Re: Need help getting replacement Detention Free Tuning Encoder with Push Button

Jack Purdum
 

Sorry 'bout that; I had no idea they would charge that much. If you want, I could order a bunch and you could sell the excess to friends who are in the same situation. I just sent a package to the Netherlands and, even though it only weighed about 4oz, it cost $14 to ship. I would guess that 10 encoders would weigh a little more, so figure $17 for shipping plus whatever the encoders cost. Let me know if you want me to do that.

Jack, W8TEE

On Tuesday, January 1, 2019, 5:23:05 AM EST, Snowist <uyelik@...> wrote:


Thanks Jack, it seems Mouser will add around 30 bucks for international shipping. Anyone knows any Ali or Banggood link for no-detent ones?

Thanks and happy new year 

Re: Bitx40

Evan Hand
 

The first picture is correct mounting: the USB connector and reset button are between the two boards.  There is history there that the original design had the Nano on the other side of the Raduino board.  That was changed to allow the display to be closely mounted to the Raduino.  Moving it to the other side would have either required a redesign of the Raduino board layout, or install the Nano pins on the "wrong" side of the device and plug it in that way.  No real need to get to the reset switch, and the USB port is still accessible.

BTW, how do you get email or search the web?  Are you doing it on a phone or tablet?

73
Evan
AC9TU

Re: Rotary encoder

Jack Purdum
 

First, try moving the encoder leads and see if it has an impact. If that fails, try a Bourne (or better type) encoder. If that fails, see if you can find a reasonably-priced optical encoder. I'm no EE, but these might help.

Jack, W8TEE

On Tuesday, January 1, 2019, 7:11:00 AM EST, Peter Russell <peter.russell@...> wrote:


Another little problem.
I'm finding that the rotary encoder is generating quite a bit of noise.
I can hear every 'tick' when I turn it.
Is this normal, or have I got a bad un?

I don't have any experience of rotary encoders, but this one seems a bit
'flimsy'.
I would have expected something a bit more substantial - or is this just
me being a bit picky?

Peter G8FWY

---
This email has been checked for viruses by AVG.




Re: DSP cheap for qrp

Jack Purdum
 

JackAl is using the Teensy 3.6 and has the speed (180MHz) and memory resources (1Mb flash, 256K SRAM) for us to do very good DSP using their audio board. Paul has written a very useful FFT library for it, too. The bad news is that the Teensy 3.6 and audio board together cost $44. On the plus side, it works very well with the Arduino IDE.

Jack, W8TEE

On Tuesday, January 1, 2019, 4:06:12 AM EST, giuseppe callipo <ik8yfw@...> wrote:


Thanks Josh and Happy new year. 
The first project was that based on f103, It was like a challenge to make e cheapest dsp ever, if you follow the link GitHub of the 103 you will found the schematic jpg.
Forse the Stm32f4 instead, i will consider also a discovery series st board but It Is more expensive and the ADC on boarboard can work only at audio frequencies. I make this project as starting point, for example increasing the sample frequency you can transform It from audio DSP to if-dsp and out inside other code to handle modulation like the ArmRadio project that you found with a simple search. Of course of the finalmente use Is as audio DSP the best solution Is using a discovery board or ADC DAC card interfaced by i2c, the code change only the ADC DAC setup. In the next days i Hope to add some info about the schematic, but are only wire cinnections and a small module to get signal in out the Stm32.
There are some experiences with the convolution filtering that need to do but Need a lot of study about It 

Have a nice day, if you can some tests send me info about It.
Best 73 and Happy new year. Ik8yfw

Re: DSP cheap for qrp

Riccardo M
 

Hi Giuseppe,
maybe you can take a look to
-ads1115 ( i2c 16 bit ADC+pga for 1.3€ on AliExpress)
-mcp4725 (i2c 12bit DAC for 0.68€ on AliExpress)

i am following your project with great interest!
best regards

Riccardo IU4IRC

Re: Bitx40

ae1ct1998 <AE1CT1998@...>
 

My cell phone


On Tue, Jan 1, 2019, 10:30 Evan Hand <elhandjr@... wrote:
The first picture is correct mounting: the USB connector and reset button are between the two boards.  There is history there that the original design had the Nano on the other side of the Raduino board.  That was changed to allow the display to be closely mounted to the Raduino.  Moving it to the other side would have either required a redesign of the Raduino board layout, or install the Nano pins on the "wrong" side of the device and plug it in that way.  No real need to get to the reset switch, and the USB port is still accessible.

BTW, how do you get email or search the web?  Are you doing it on a phone or tablet?

73
Evan
AC9TU