Date   
Franken-uBitx (no Raduino, and apologies to Mary Shelley :-)

Mark Pilant
 

Never one to take the easy road, I thought I'd share my progress so far
with building up my uBitx. I call it my "Franken-uBitx" because it is
made up from a lot of different parts I had laying around. :-) :-)

So far, my Franken-uBitx consists of the following:
1) An unchanged uBitx main board (no Raduino used)
2) An Adafruit 2050 3.5 inch (320 x 480) TFT touchscreen
3) An Adafruit 2045 Si5351 Clock Generator Breakout board
4) Meduino Mega2560 Pro Mini board

as the major assemblies.

The software started out as the TFT_uBitx sketch by VU2SPF and VE1BWV.
I then made various changes to the code:
1) To more easily support the Meduino board (2 row pin headers
instead of single pins; but the board is about the size of an
Uno)
2) Support the TFT display
3) Support the encoder

Some of the other changes I have made (or am planing to make) are:
1) Added a socket for the TDA2822 chip
2) Separate fuses for the uBitx board and PA
3) Separate On/Off switch (and power on LED) and traditional
(shaft) sized volume control
4) Separate 5V regulator (with plus and minus power buss) to
power the Meduino, display, and Si5351 boards

All of this in a Hammond box I had around.

Right now, the sketch works with a nice touch screen interface as well
as all the clock frequencies generated. The next major step is to wire
up the 5V regulator and power buss. Then it is really nothing more than
connecting everything up. Then some final testing before getting on the
air.

In addition, I'll be documenting all of this (with pictures) for anyone
else to borrow from :-)

Oh yes, I also have another uBitx I plan to leave pretty much stock except
for changing the 2 line display to a 4 line display. That way I'll have
an easy way to do A / B comparisons.

Hopefully my project will add to the pool of things for others to try :-P

73

- Mark N1VQW

Re: Tx frequency selection for FT8 on BITX40 running Allard's sketch #bitx40

Tim Gorman
 

I believe you are transmitting an audio tone through a SSB transmitter.
If your freq dial is set to 7.074.000 and you are sending a 1khz audio
tone you will actually be transmitting on 7.075.000 (i.e. 7074000 +
1000).

tim ab0wr

On Thu, 19 Apr 2018 06:33:56 -0700
"Doug W" <dougwilner@...> wrote:

On Thu, Apr 19, 2018 at 03:09 am, Vic WA4THR wrote:


There may be a misunderstanding of how the digital modes work with
today's computer software.
Thank you for the reply but your answer does not address the
question.  I have a clear understanding of the receive function which
you describe quite well.  The question was are you transmitting right
on 7.074.000 or are you offsetting that at all?

Re: uBITX shipping time

Doug W
 

On Thu, Apr 19, 2018 at 11:50 am, <hotrod541@...> wrote:
What software is best to install?
The rig ships with a perfectly functional sketch installed.  I recommend you get it all put together and fully tested before trying any of the other sketches or modifications floating around.

Re: Replacement for the blown tda2822

Doug W
 

Ron,
A quick glance at BITXmap.com shows there are more ZLs than you might think.  Although it looks like Christchurch would make you the first from the South Island.

Re: UbitX I2C GPIO Breakouts?

AA9GG
 

I managed to get a few free samples of the PCF8574N from TI.  It is an I/O expander I2C - 8bits in a 16DIP package.  It is basically the chip used on the I2C LCD piggyback boards. I keep you posted.

On Thu, Apr 19, 2018 at 12:03 PM, Gerry Hull <gerry@...> wrote:
Understood.  I’m wanting to put transverters in my ubitx; would love to control the I/O switching, as well as have the display show the transverted frequency. So, these would not be signals that needed to be switched rapidly.   I would not use it to key CW, but I might use these I/Os for a keying sequencer.

Gerry, W1VE



On Thu, Apr 19, 2018 at 12:45 PM Jerry Gaffke via Groups.Io <jgaffke=yahoo.com@groups.io> wrote:
Could work fine.
The library to speak i2c is already getting loaded for the si5351.

Primary issue I see is that i2c links take a millisecond or so,
vs under a microsecond for direct access of an IO pin.
At some point as we load up the Nano with i2c peripherals, it will get bogged down.
This applies to i2c displays as well.
Hasn't been an issue yet.

Another possible issue is that the common i2c bus provides an easy way
for RFI and birdies to find their way into the receiver.

Jerry, KE7ER


On Thu, Apr 19, 2018 at 09:28 am, Mark Kesner wrote:
Looks like a great idea to me.  I googled the mentioned boards and there is a lot of info on how to use these.  Sparkfun has breakout boards for a similar device for $5 as well as examples and links to the library, etc.

I guess it depends on the firmware you are using and whether there is room to load the library. (?)

Thanks!

Mark
KC4GIA




--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
NAQCC 3123, SKCC 4628

Bitx 40 - My Raduino doesn't look like the others #bitx40 #radiuno #bitx40help

Jim Miller
 

I'm wiring up my newly unboxed BitX40 and the back of my Raduino (adruino uno) does not look like the website http://www.hfsignals.com/index.php/2017/11/23/wiring-up-the-bitx40/

I've attached two photos, and what I _think_ is correct?

Anyway, I would appreciate it if I could get some confirmation before I potentially release the magic smoke.


Thanks,
Jim

Re: show your mic

Matthew S <Rigamurow@...>
 

Literally just finished my curmudgeon.  Thanks to K5ESS and N1AW

On Thu, Apr 19, 2018 at 3:18 PM Ashhar Farhan <farhanbox@...> wrote:
What do you know! Mine is uglier than yours. 


On Thu, 19 Apr 2018, 22:53 Bill KC5SB, <blmerideth@...> wrote:
Here's mine.  I made it from an old 9 volt flashlight.

Re: Transmit indicator light.

MAX <max@...>
 

Thank you Gary.

 

Regards.

 

Max K 4 O D S.

 

I've Never Lost the Wonder.

 

Antique Electronics Site: http://www.angelfire.com/electronic/funwithtubes/

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Gary Anderson
Sent: Thursday, April 19, 2018 6:03 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Transmit indicator light.

 

Hi Max,
I'm assuming that you have an enclosure from Sunil (VU3SUA) by the description.  He has pictures on his website showing how he has done the  RX/TX LED wire-up.
The website is  https://amateurradiokits.in/
the pictures are the second and third from the last.

He is picking up the 12V RX and TX control signals from the uBITX RX/TX relay by soldering wires to the bottom of the uBITX PCB.  He also picks up the ground from the relay.  He then routes 3 wires (RX,TX,GND) to a small prototype board with series current limiting resistors on RX and TX.  No reason you couldn't put your resistors anywhere along that route.  I would have put them right on the PCB.

Regards,
Gary
AG5TX

Re: Bitx 40 - My Raduino doesn't look like the others #bitx40 #radiuno #bitx40help

Jerry Gaffke
 

Looks like you got a Raduino with the right angle pins along the right side
suitable for plugging into a uBitx main board.
Raduinos for the Bitx40 that I have seen thus far had only a 5 pin connector
soldered in there.  They also had the blue pot on the wrong side of the board,
had to remove the display to access the display contrast adjustment.
Consider yourself lucky.

You have correctly figured out how to plug your 5 pin harness into that 16 pin connector.
Be careful of spare flying leads, I'd put tape over the ends so you don't short 12v to 
something.  Better yet, you could entirely remove the wire plus pin from the harness
by pressing the little metal tab of the pin with something pointy while pulling on the wire.

Will be interesting to see if you have Bitx40 firmware installed in that Raduino.
If it's uBitx firmware, will be easy enough to load new firmware.
Let us know if you need help getting proper firmware going.

I doubt you will have any trouble with this.

Jerry, KE7ER


 

On Thu, Apr 19, 2018 at 01:21 pm, <stljim@...> wrote:

I'm wiring up my newly unboxed BitX40 and the back of my Raduino (adruino uno) does not look like the website http://www.hfsignals.com/index.php/2017/11/23/wiring-up-the-bitx40/

I've attached two photos, and what I _think_ is correct?

Anyway, I would appreciate it if I could get some confirmation before I potentially release the magic smoke.

show your mic

Gary Shriver
 

I know it’s there somewhere!!

 

 

 

 

Re: uBITX shipping time

Fred Buecker
 

Mine came today! 45 hours from India to Pittsburgh!


On Thu, Apr 19, 2018, 4:13 PM Doug W <dougwilner@...> wrote:
On Thu, Apr 19, 2018 at 11:50 am, <hotrod541@...> wrote:
What software is best to install?
The rig ships with a perfectly functional sketch installed.  I recommend you get it all put together and fully tested before trying any of the other sketches or modifications floating around.

Re: Transmitter Mods

Howard Fidel
 

Actually, I would prefer to rewind the transformer with a center tap, and eliminate the chokes, feeding the DC to the center tap.
Z for L8, L9 should be >> then the output impedance which looks like the antenna impedance for the 1:1 transformer.
I am adding a 70 watt amplifier to my uBitx, so I just need 5 watts out on all bands to drive it. I doubt I will do much more, on the transmitter, but I will have to see how the amp behaves. I may to to better equalize the output level between the bands.

Howard



On 4/19/2018 2:37 PM, Jerry Gaffke via Groups.Io wrote:
The parallel resonance helps us to a point, though an ideal inductor would generally be better.
For example, if the inductor is self resonant at 14mhz, we'd see much more power out on 20m
than we see on 10m.  I'd prefer to keep gain vs freq somewhat controlled and predicatable.

The caps are easier to add, easier to obtain, have a higher self resonance:
    https://electronics.stackexchange.com/questions/193608/self-resonance-frequency-for-mlcc-capacitor
Maybe add 220pF caps across all six of the 22 ohm emitter resistors, and forget the inductor?
Then add a variable cap somewhere around Q90 that can be tweaked to give the flattest response,
that setting may vary given your particular 2n3904 transistor characteristics. 
 
But the inductor in series with the negative feedback is a good idea.
If this can all be done with just 3 extra components and get good enough results across
the different uBitx's out there, I'm fine with that.

One other issue:
As Henning notes in post 45035, the chokes L8 and L9 are best wound on a single core:
See the discussion below figure 4 on this webpage, where he discusses how the bifiliar
approach works, though he does not discuss the individual choke solution:
    http://ludens.cl/Electron/mosfetamps/amps.html
I was seeing significantly worse results in how the uBitx final worked compared
to the WA2EBY final in my LTSpice simulation, could be due to these chokes.
    https://groups.io/g/BITX20/topic/9615903
I may have to play with that further, not obvious to me how or if the individual chokes
at L8, L9 would impact the results..

Jerry, KE7ER


On Thu, Apr 19, 2018 at 11:00 am, Jerry Gaffke wrote:
Good question.
It's a parallel resonance:  
    https://www.everythingrf.com/community/what-is-self-resonant-frequency


Re: UbitX I2C GPIO Breakouts?

NNicholas@...
 

I have used these chips on many projects and used them to drive led displays, but for this application,  given the slower response of the I2C serial bus, I would stick with the given direct I/O driven LCD display and use the I2C serial to communicate with a second arduino, to add more functions. That way you keep speed, have true multitasking going on, and not only double the io, but you double memory. I plan to add an custom auto antenna tuner to mine, and a 100 watt amplifier , all in the same enclosure. I will be using a second arduino based processor to control both the filtering and switching of the amplifier in and out, and seek and search for best antenna match without having to interrupt the radio operations. That way, when auto tune is turned on, the amp will drop out to low power , the antenna will tune, and then return to the original settings. Like wise as the radio is turned to various bands, the pi filters in the amp can automatically switch with the band.
Nick
N8GIR

Re: anybody tried softrock and hdsdr with Ubitx?

K9HZ <bill@...>
 

Yeah Ian did… and he has a video on Youtube using it…

 

 

Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton – J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com

Like us on Facebook! facebook icon

 

Moderator – North American QRO Group at Groups.IO.

 

email:  bill@...

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Paul Schumacher via Groups.Io
Sent: Thursday, April 19, 2018 11:50 AM
To: BITX20@groups.io
Subject: Re: [BITX20] anybody tried softrock and hdsdr with Ubitx?

 

Has anyone tried a softrock and hdsdr with Ubitx to get the spectrum and

waterfall display?  (or something similar?)

 

If so, can you please describe how to go about doing it?

 

thanks,


Paul K0ZYV

Re: Replacement for the blown tda2822

Dexter N Muir
 

Hi Ron

 

Feilding here. Not building uBitx - dead-ended with Bitx-40, QTH with horrendous QRM, and retiree budget stretched with care of 2 grandsons. I contribute my experience and 50+years as a Ham ...

73
Dex, ZL2DEX

Re: UbitX I2C GPIO Breakouts?

AA9GG
 

Good idea Nick.  On the Atmel, max I2C speed is 400Khz, but a lot of devices do not like this "hi-speed" and you need to run them slower.  Right now I have my bus running at 200Khz and see no delay on my LCD.

On Thu, Apr 19, 2018 at 6:44 PM, NNicholas via Groups.Io <NNicholas@...> wrote:
I have used these chips on many projects and used them to drive led displays, but for this application,  given the slower response of the I2C serial bus, I would stick with the given direct I/O driven LCD display and use the I2C serial to communicate with a second arduino, to add more functions. That way you keep speed, have true multitasking going on, and not only double the io, but you double memory. I plan to add an custom auto antenna tuner to mine, and a 100 watt amplifier , all in the same enclosure. I will be using a second arduino based processor to control both the filtering and switching of the amplifier in and out, and seek and search for best antenna match without having to interrupt the radio operations. That way, when auto tune is turned on, the amp will drop out to low power , the antenna will tune, and then return to the original settings. Like wise as the radio is turned to various bands, the pi filters in the amp can automatically switch with the band.
Nick
N8GIR




--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
NAQCC 3123, SKCC 4628

Re: show your mic

馬玉麟
 

Using a section of pen for Mic and PTT switch installation. 

2018-04-20 4:56 GMT+08:00 Matthew S <Rigamurow@...>:

Literally just finished my curmudgeon.  Thanks to K5ESS and N1AW

On Thu, Apr 19, 2018 at 3:18 PM Ashhar Farhan <farhanbox@...> wrote:
What do you know! Mine is uglier than yours. 


On Thu, 19 Apr 2018, 22:53 Bill KC5SB, <blmerideth@...> wrote:
Here's mine.  I made it from an old 9 volt flashlight.


Re: show your mic

tony.vasile@...
 

Here is my cigar-box uBitx with a wooden dowel Mic using the kit electret mix element and the Microsoft.

Tony, KB9A 

On Thu, Apr 19, 2018, 5:18 PM Gary Shriver <gshriver@...> wrote:

I know it’s there somewhere!!

 

 

 

 

Re: show your mic

tony.vasile@...
 

AAAAAAND here's the pic!

Tony KB9A 

On Thu, Apr 19, 2018, 8:33 PM Tony Vasile, Jr. <tony.vasile@...> wrote:
Here is my cigar-box uBitx with a wooden dowel Mic using the kit electret mix element and the Microsoft.

Tony, KB9A 

On Thu, Apr 19, 2018, 5:18 PM Gary Shriver <gshriver@...> wrote:

I know it’s there somewhere!!

 

 

 

 

Re: Extension cables for display/Raduino

Jonathan
 

Also see this article:  https://groups.io/g/BITX20/topic/7573243
It includes a link to a nice article (PDF) by Al Duncan VE3RRD showing how to make an extension cable from an old computer IDE cable (flat ribbon cable).

-Jonathan