Date   

Re: New VK4PLN Audio Daughter Board + BCI

Nick VK4PP
 

Hi
I could change it, but that would increase cost for end user,
The LM324 are 50c the LM4562 are $5 each...
Will there be a noticeable difference with a 700hz cw signal?
73


Re: New VK4PLN Audio Daughter Board + BCI

BillandAgnes Franzwa <franzwa1@...>
 

Nick

looks great, and a good way to add mods to the uBITX

would you consider a pair of LM4562s for the CW filter?...a little quieter, and would use the same R/C components

Bill
K6SIK


On Wednesday, May 30, 2018 6:05 PM, Nick VK4PLN <nickpullen@...> wrote:


Hi Everyone.
I am working on a new board that will give a few extra features to stock uBitx.

Its an Audio board providing easy access to Audio I/O pins. (add in your own AGC board, External amplifier...)
A place for an SSM2167 Mic Pre-amp. (with filtering for feedback and shutdown on TX)
Simple 4 component PTT POP fix. (BS170)
Switchable 200hz CW filter. (LM324)
and a bonus Snap off section with a 3.5MHZ BCI filter for the RX chain.

Here is a pre-view, NOTE this is a WORK-IN-PROGRESS.


Suggestions and corrections welcome.

73 Nick VK4PLN



New VK4PLN Audio Daughter Board + BCI

Nick VK4PP
 

Hi Everyone.
I am working on a new board that will give a few extra features to stock uBitx.

Its an Audio board providing easy access to Audio I/O pins. (add in your own AGC board, External amplifier...)
A place for an SSM2167 Mic Pre-amp. (with filtering for feedback and shutdown on TX)
Simple 4 component PTT POP fix. (BS170)
Switchable 200hz CW filter. (LM324)
and a bonus Snap off section with a 3.5MHZ BCI filter for the RX chain.

Here is a pre-view, NOTE this is a WORK-IN-PROGRESS.


Suggestions and corrections welcome.

73 Nick VK4PLN


Re: Connector Error in Schematic #bitx20help #bitx40help

Jerry Gaffke
 

Yes, the pin numbering for the 16 pin Raduino connector  is swapped end-for-end on the
Raduino schematic vs how it is shown on both versions of the uBitx schematic.
That's unfortunate.
In both versions of the uBitx schematics, pin 2 has 12v, and the Raduino has 12v on the
corresponding pin 15.  
The Raduino also has pin 16 tied to 12v,, the corresponding pin 1 on both versions of
the uBitx main board is left unconnected.

The schematic of the first version of the uBtix shows pin 1 grounded, this schematic is not correct.
Those boards were built with pin 1 a no connect.
    http://www.hfsignals.com/index.php/ubitx-r3-archived/

There is no link from the hfsignals.com homepage to the older version of the uBitx.
That's also unfortunate, as there are thousands of such boards in existence.

This has been corrected in the new schematic for the uBitx here, showing it to be a no connect:
    http://www.hfsignals.com/wp-content/uploads/2017/12/ubitxr4.pdf
 

The Bitx40 main board does not have such a connector, just a wiring harness.
That extra 12v wire on pin 16 of the the Raduino connector is left unused.
Here's the schematic for the Bitx40, which also shows the Raduino:
    http://www.hfsignals.com/index.php/2017/11/23/bitx40-circuit-description/

Here's the latest schematic for the Raduino from the uBitx section of the website:
    http://www.hfsignals.com/wp-content/uploads/2017/12/raduino.pdf

I believe the Raduino for the Bitx40 and the uBitx is identical except for how the 
contrast pot and the connectors get stuffed, and of course the firmware.
The raw PC board is likely identical.

Jerry


On Wed, May 30, 2018 at 05:10 pm, <tituskz1g@...> wrote:
The schematic diagram for the "B? ubitx" board (base board for Arduino Nano, Si Labs oscillator, LCD...) has an error at the P3 connector, "OSCILLATORS." The pin numbers are in reverse order and thus do not match the pin numbers on the main transceiver board schematic diagram.  P3 also shows pins 15 and 16 (which should be pins 1 and 2) both connect to the +12V for the LM7805 regulator.  Pins 1 and 2 on the mating connector in the diagram show pin 1 connects to ground and pin 2 connects to +12V.

It would help to have the signals labeled at P3 on the "B? ubitx" board, and to have the same name "OSCILLATORS" for the connector in each diagram.  The color of the connecting wires also would help at other connectors.

Another minor point...  It might help those of us who think about mods and hacks to know whether signals are inputs, outputs, or bidirectional.

Thanks.

--
Jon Titus, KZ1G
Herriman, UT USA


Connector Error in Schematic #bitx20help #bitx40help

tituskz1g@...
 

The schematic diagram for the "B? ubitx" board (base board for Arduino Nano, Si Labs oscillator, LCD...) has an error at the P3 connector, "OSCILLATORS." The pin numbers are in reverse order and thus do not match the pin numbers on the main transceiver board schematic diagram.  P3 also shows pins 15 and 16 (which should be pins 1 and 2) both connect to the +12V for the LM7805 regulator.  Pins 1 and 2 on the mating connector in the diagram show pin 1 connects to ground and pin 2 connects to +12V.

It would help to have the signals labeled at P3 on the "B? ubitx" board, and to have the same name "OSCILLATORS" for the connector in each diagram.  The color of the connecting wires also would help at other connectors.

Another minor point...  It might help those of us who think about mods and hacks to know whether signals are inputs, outputs, or bidirectional.

Thanks.

--
Jon Titus, KZ1G
Herriman, UT USA


Re: ubitx assembly confusion, help needed

Dexter N Muir
 

For the 3.5mm jacks, get a plug. Verify tip and ring connections by multimeter, plug it in and verify the socket's tabs. Simple, Simon :)

73
Dex, ZL2DEX


Re: SDR as Waterfall display

brad martin
 

I think mine bottoms out at 52mhz but I can probably put the rf through the direct sample mod on the rtlsdr. I assume if I transmit that the RF is not going to go directly into the sdr as in the rf out is a different path

On Wed, May 30, 2018 at 3:42 PM Ralph Mowery <rmowery42@...> wrote:
I have not tried it,but from the circuit description the first conversion is at 45 MHz.  I would try laying a short insulated wire near Q10.  You may even be able to tap off the emitter of q12 with a low value capacitor. 

Then tune the SDR ( I assume we are talking the about $ 15 TV dongle, but does not matter)  to around 45 MHz.  

There may be more out now, but the two that I bought a number of years ago, one goes from about 25 MHz up and the other starts at 50 some MHz.

de ku4pt


On Wed, May 30, 2018 at 3:06 PM, brad martin <emclinux@...> wrote:
I noticed that the CEC firmware has an SDR mode but this seems to be where the audio as as well are transmitted to the SDR and handled there.  Seems to be a good method for digital or recording but is there a way to just use the SDR as a waterfall display and still have the radio function as normal (i.e. have audio come out the radio speakers)?

Brad

-- 


Re: SDR as Waterfall display

Ralph Mowery
 

I have not tried it,but from the circuit description the first conversion is at 45 MHz.  I would try laying a short insulated wire near Q10.  You may even be able to tap off the emitter of q12 with a low value capacitor. 

Then tune the SDR ( I assume we are talking the about $ 15 TV dongle, but does not matter)  to around 45 MHz.  

There may be more out now, but the two that I bought a number of years ago, one goes from about 25 MHz up and the other starts at 50 some MHz.

de ku4pt


On Wed, May 30, 2018 at 3:06 PM, brad martin <emclinux@...> wrote:
I noticed that the CEC firmware has an SDR mode but this seems to be where the audio as as well are transmitted to the SDR and handled there.  Seems to be a good method for digital or recording but is there a way to just use the SDR as a waterfall display and still have the radio function as normal (i.e. have audio come out the radio speakers)?

Brad

-- 


SDR as Waterfall display

brad martin
 

I noticed that the CEC firmware has an SDR mode but this seems to be where the audio as as well are transmitted to the SDR and handled there.  Seems to be a good method for digital or recording but is there a way to just use the SDR as a waterfall display and still have the radio function as normal (i.e. have audio come out the radio speakers)?

Brad

--


Re: Ideas for AM, NB FM Demod and CW filter board

Joe Puma
 

You can’t transmit with a rtl-SDR dongle.  But they make great pan adapters for the bitx line. I will use one with my units when I start to build it. 

Joe
KD2NFC



On May 30, 2018, at 12:05 PM, Nelson <ngtdlt@...> wrote:

Although having the ability to xmit AM etc would be nice, perhaps foregoing xmitting and including a simple AM detector circuit so the receive section could also be a general coverage SW receiver.  It seems it would be easy to do a mod for reception, especially since I had to add a high pass filter to keep local AM stations from swamping the bands.  I could get excellent reception of one local AM BC Band station without any alteration to the circuit so it was getting into the audio amp section and getting rectified somewhere...

Nelson, KG7GYS

On Tue, May 29, 2018 at 9:35 AM, Rahul Srivastava via Groups.Io <vu3wjm@...> wrote:
Hi!

I was discussing with Farhan on this topic for an add on demod board to add more versatility to uBitx.  CB radios often used a common chip for AM as well as NBFM receive. I enquired here and TDA1220 is available in mkt for slightly more than a $.

With the parallel XF mod maybe we can have an add on board with this chip and a 6 pole Cohn CW xtal filter. 2nd IF's now being 12MHz SSB, 10.7MHz + 455KHz for AM/FM and possibly 8.xx MHz or some other for CW. 

Guys what to suggest..

73

Rahul VU3WJM 




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature


Re: ubitx assembly confusion, help needed

W7SS
 

David,

There are small brackets and screws to mount the USB PC board. The brackets are painted the same color as the case. The next board is used to connect the fuse holder to the on/off switch. The final board mounts to the back of the rotary encoder.
I'll post photos of the 3.5mm jacks later unless someone else beats me to it.
BTW: does your LCD display line up with the cut out in the front panel? Mine is way off.

Ken


Re: ubitx assembly confusion, help needed

David
 

Sorry everyone. I should not post messages from my cell phone. The second paragraph is:

the Inkits case comes with three bare small PCBs. One for a RS232 and USB connector. However, it seems to me there is no way to mount this PCB with the connectors soldered in that makes it usable. Does anyone have a picture of how they mounted this PCB to make it work? Also, does anyone know what the other PCBs are for and if yes, can you post images of their installation too?  Thank you.


Re: I would like to chat with someone that has set there ubtx up with a raspberry pi and is using fl digi,

iz oos
 

Can it work even without agc? Would u use the speaker output of the Ubitx or would u take the audio somewhere else?


Il 30/mag/2018 16:01, "Tony D'Angelo via Groups.Io" <tony_d_33931=yahoo.com@groups.io> ha scritto:
model numbers and pics if you can thanks


Re: boosting the power on 28 MHz #ubitx

atouk
 

With all the work in progress by different people, I'll just wait patiently until a design is settled on, and some enterprising entrepreneur creates a parts kit with all the required bits and bobbins needed.  Meanwhile, interesting  and educational reading.

On 5/30/2018 12:07 PM, ajparent1/KB1GMX wrote:
Arv,

Thats a path I'm following.  The first step was to get enough drive to get 10W at 10M
then its easier to tamp down the gain at lower bands to that level.  Least it would
seem that way.

Back to work.

Allison


Re: boosting the power on 28 MHz #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

Arv,

Thats a path I'm following.  The first step was to get enough drive to get 10W at 10M
then its easier to tamp down the gain at lower bands to that level.  Least it would
seem that way.

Back to work.

Allison


Re: Ideas for AM, NB FM Demod and CW filter board

Nelson
 

Although having the ability to xmit AM etc would be nice, perhaps foregoing xmitting and including a simple AM detector circuit so the receive section could also be a general coverage SW receiver.  It seems it would be easy to do a mod for reception, especially since I had to add a high pass filter to keep local AM stations from swamping the bands.  I could get excellent reception of one local AM BC Band station without any alteration to the circuit so it was getting into the audio amp section and getting rectified somewhere...

Nelson, KG7GYS

On Tue, May 29, 2018 at 9:35 AM, Rahul Srivastava via Groups.Io <vu3wjm@...> wrote:
Hi!

I was discussing with Farhan on this topic for an add on demod board to add more versatility to uBitx.  CB radios often used a common chip for AM as well as NBFM receive. I enquired here and TDA1220 is available in mkt for slightly more than a $.

With the parallel XF mod maybe we can have an add on board with this chip and a 6 pole Cohn CW xtal filter. 2nd IF's now being 12MHz SSB, 10.7MHz + 455KHz for AM/FM and possibly 8.xx MHz or some other for CW. 

Guys what to suggest..

73

Rahul VU3WJM 




--
I always thought the Universe was a wonderfully strange place until I studied Particle Physics - I now know the Universe is, in fact, profoundly odd in nature


Re: UBitx

ajparent1/KB1GMX <kb1gmx@...>
 

I'm using V4.3  and when I enabled VFO B it started to remember were I was on both.
Made it easier to put 3.8 in a and 28.4 in B and bounce back and forth.



Allison


Re: I would like to chat with someone that has set there ubtx up with a raspberry pi and is using fl digi,

ajparent1/KB1GMX <kb1gmx@...>
 

I have tried a 5, 7 and 10.1 inch display and the 7" was better and largest is way better for reading
and touch.  The 5" however if I scaled the screen such that few objects were there or allowed for
two finger gestures was workable but not as convenient.  The 10.1 ended up in a wood box with
batteries and RPi as a sorta steampunk laptop.  It was supposed to be a conversation piece
but it has turned out to be a very useful portable.  

When I've had RPi questions or troubles the general internet public had usually solved it or could help.
For example volume and gain issues the people playing with sound and video are goto even though
your doing FLdigi.  Do take advantage of the greater RPi public.


Allison


Re: I would like to chat with someone that has set there ubtx up with a raspberry pi and is using fl digi,

Bo Barry <bobarr@...>
 

I'll stick one in the mail. Definitely no $$.

Wow, I'm embarrassed. I've been struggling getting my pi/ubitx going and Vince mentioned YouTube. I didn't even think of that!  Lots of help there.

Most of my problems were struggles with the 5" display. The elecrow 7" with a stand are looking attractive.

I did have trouble with the pi audio levels and made some tweaks to make the USB audio the default and one program to get the audio to max and then used the output volume control as needed.   I need some more time to get notes taken.

The ubitx power out varies a lot. I get 7 on 40 and only 3 on 20.  However I've done FT8 & CW successfully with both.

I bought some cheap pins to stick in as sockets for. the driver stage to experiment just a little to get a little more power. Not going big guns, I have an Icom7300 and 40 year old Heath HA14 linear  for that.
73. Bo W4GHV 


Re: UBitx

Gary Anderson
 

Maybe I over simplified the question of what Al is wanting to do.
You can store frequencies for VFO_A and VFO_B by toggling between the VFOs
... this won't be the "last" frequency, but the last that was in a VFO, before switching to the other VFO.

In the original code:

in the ubitx_menu file in function void menuVfoToggle(int btn)

 
      if (vfoActive == VFO_B){
        vfoB = frequency;
        EEPROM.put(VFO_B, frequency);
        vfoActive = VFO_A;
        printLine2("Selected VFO A  ");
        frequency = vfoA;
      }
      else {
        vfoA = frequency;
        EEPROM.put(VFO_A, frequency);
        vfoActive = VFO_B;
        printLine2("Selected VFO B  ");      
        frequency = vfoB;
      }

Just to raise awareness of non volatile lifetime write cycles, and potential longer term issue.
Generic EEPROM is around 100K life cycles.
You would need to toggle the VFO  ~27 times a day for 10 years before hitting 100,000 write cycles.

Now since Jack is using Teensy, which uses NVM 'flash' and not EEPROM, the write cycles could be lower.

For general Data Flash in the Kinetis / Teensy  NVM,  the 5 year min data retention is 10K write cycles, and 20 year min data retention is only 1K write cycles.
There is a more reliability gained in the "FlexRam as EEPROM" and is dependent on the EEPROM to FlexRam ratio.
The use of this will actually improve reliability over EEPROM, it just has to be implemented as such.

Regards,
Gary