Date   
Re: Practical CW Operation? #ubitxcw

Chris Clarke G3SQU
 

CW 99.99% of time  ... now where did I put that mic ...

Re: Protoneer Nano-Arm #ubitx

Jerry Gaffke
 

I got a Blue Pill with the 48 pin TQFP STM32F103 about a year ago, got it to speak Arduino just fine.
Of course, some Arduino libraries aren't ported, but it's a major step up from the Nano.
Blue Pill boards can be had for $2 each.

As I suggested a few posts back, if you build a board with the 64 pin TQFP STM32F103 you have a wide range
of processors to choose from.  From an ARM M0 core with 64k of flash and 8K of RAM  for $1 at quantity
up to an M4 core with 1024k of flash and 192k of RAM and floating point hardware for for $8.
All pin compatible, with 50+ pins of user IO.  
Here's the bottom end part:  https://www.mouser.com/datasheet/2/389/stm32f030f4-956260.pdf
and the top end:  https://www.mouser.com/datasheet/2/389/stm32f405rg-956214.pdf

Build our own board and we can choose our own processor frequency to avoid that 12mhz BFO,
and perhaps have the UART-to-USB connection happen in a cable so we don't 
normally have to deal with the 12mhz USB oscillator.

Though, in an attempt to stay on topic, I will admit that
it would be much easier to just buy the Protoneer.

Jerry, KE7ER




On Tue, Apr 24, 2018 at 02:08 pm, Kees T wrote:
The various STM "pill boards" sound promising and are --very-- cheap.....did you know there are 17 different STM32F103 products out there and the STM32F103C8 is one of the "simpler" chips. The chips themselves go from 36 pins to 100 pins. I see they all have a RTC.

Re: Protoneer Nano-Arm #ubitx

Gary Anderson
 

I stumbled across the Protoneer last week when searching for a controller upgrade.
I was unable to find a Blue Pill or ST board variation that was _pin_ compatible with the Nano.
Maybe I didn't look hard enough.  I know the Blue Pill seems to be a favorite one to throw in the mix.

It certainly seems that it is leading the performance per $ in this market space.

My selection criteria was:

1. More Flash, so people don't have to choose which options from the already developed software they could load, and more headroom for further development.
2. More SRAM.
3. Supported by the familiar Arduino IDE, where the software work is being done.

4. Pin compatible with the Nano for direct replacement on the Radunio board without the need to spin an adapter board (cost with shipping adder)

5. Reasonable total cost of the complete upgrade, so it is an option more aligned to Farhan’s goal of a $100 radio.  

6. Can be done in a timely manner.

Now, I have not yet received the board or even begun to look at the software changes required.

I do know that there will be small changes needed on which serial object is called.  There may be other quirks.

The board is 3.3V so the impact of that will need to be vetted. (I see 3.3V as being beneficial)
There's a RTC, but I didn't see a familiar Vbat for a coin cell.

 

Adafruit seems to be doing a lot of development with the SAMD21, there could be trickle down from that, or at least re-assuring of the SAMD21 core.

At this point, it is a project idea and not a turn-key proven solution.

Regards,
Gary
AG5TX

Re: #ubitx Fm/Am mode #ubitx

Skip Davis
 

Interesting Radu, have you thought of using a 10.7 IF instead? It might be easier for image rejection but more important is it could be fed from the junction of C40, R37, and 12MHz Xtal filter. At that point you would only have to shift CLK1 frequency about 1.3MHz when shifting modes to AM or FM. That might also use less circuitry.

Skip Davis, NC9O 

On Apr 24, 2018, at 14:55, Radu <radu.loga@...> wrote:

I am just waiting to receive the micro bitx then I will start the experimentation. The idea is to use the bitx as a development board for the additional am/fm components. Meanwhile I started to create the schematics in eagle because in the end my  target is to have a handheld bitx with ssb/am/fm so i will need to design a new layout to fit in a handheld case. For the Fm part I will use a demodulator ic on 455khz, maybe a Sa605. 

Re: Protoneer Nano-Arm #ubitx

Kees T
 

Gary,

I agree that none of the others are even close to matching the Nano pinout .....except for the Protoneer. And saving an interposer board would be great. Boards are in the mail .....I think.

73 Kees K5BCQ

Re: Low mic gain, was, show your mic

MAX <max@...>
 

I have bookmarked it.  Looks like there is a lot of good information there.  Thank you.

 

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 Arvo KD9HLC via Groups.Io
Sent: Tuesday, April 24, 2018 1:17 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Low mic gain, was, show your mic

 

On Sun, Apr 22, 2018 at 07:57 pm, MAX wrote:

All of the correct information needs to be gathered in one place.

Have you seen ubitx.net ?  A lot of hard work went into aggregating the information generated here.

Re: Protoneer Nano-Arm #ubitx

Jerry Gaffke
 

The problem with remaining pin compatible with the Nano is that there aren't enough of them.

Maybe stick that si5351 on the main uBitx board where it belongs using a
little itty bitty board glued to the back groundplane.  Use an I2C display so there aren't many wires
to deal with there.  Now you can sell your old Raduino in the forum and use any fool microcontroller
board you want, be it Nano, Blue Pill, Teensy, Protoneer, or RPi.

Jerry


On Tue, Apr 24, 2018 at 04:12 pm, Gary Anderson wrote:
I was unable to find a Blue Pill or ST board variation that was _pin_ compatible with the Nano.

Poor Man's Panadapter?

Bruce MacKinnon KC1FSZ
 

Hi All:

Here's an experiment that might be of interest, especially to anyone thinking about one of those fancy ICOM 73000000s.  The goal is to build a crude panadapter into my BITX rig without resorting to external PCs, SDR dongles, etc.  I am using a few cheats in my scratch-build BITX that may make this tricky on a stock unit, but I'm sure the group can figure out how to expand this into the mainstream.

It's a bit like a Sweeperino I guess.  I've built my firmware to quickly sweep the VFO across the band of interest (40m phone in my case) and then to look at the AF spectrum at each point and display the result in a simplistic spectrum display.  Obviously, this interrupts the receive for a brief instant when it is happening, but I've also set things up with an extra MOSFET so that the audio output can be suppressed during the sweep to hide the annoying sounds. You probably have this mod in your rig anyhow if you've added an AGC.

I think the most sophisticated way to go is to do some DSP fiddling of the overlapping 3 kHz segments of the spectrum that are sampled during the sweep.  At the moment I am sweeping in 500 Hz steps so there is overlap in the samples of the audio.  This needs some more experimentation to get the optimal sweep speed, the cleanest way to stitch things together, averaging, etc. but even something basic is good enough to show the activity on the band.

There's another thread going right now talking about the use of the Teensy processor, which I completely endorse.  I've used the 3.2 in all of my various BITX builds and find the added versatility of being able to do DSP very useful.  I'm not a DSP expert by any means, but there is some great capability on the Teensy boards.

I have also been using a 128x64 OLED display which makes these simple graphics possible.  I know ... it's noisy.  You guys with the giant color TFTs displays could make something even cooler I'm sure.

Here's what my initial display looks like.  The caret at the very bottom is pointing to where the VFO is currently set.  You know it's working because you can always see the signature 7199 BITX birdie!

 

This link is to a video that was made with the sweep slowed and the audio on so you can hear how it works.  It sounds like a strange SSTV mode, but it's actually the entire 40m phone band being analyzed for activity: https://www.youtube.com/watch?v=YS-Gp-PJmuk

More to follow if I can improve this.

73s,

Bruce KC1FSZ https://www.qrz.com/lookup/kc1fsz


Re: Poor Man's Panadapter?

Mike
 

Good work.

I also scratch-built the uBitx and seems to be working OK on receive, still testing out on transmit  . . . could you share more detail/photos of your build?

Re: Poor Man's Panadapter?

Gary Anderson
 

Very Nice,
Curious if you are using DSP on the Teensy 3.2  Kinetis K20 Arm4 core, or using the SGTL5000 Codec for processing.  I hear great things about the Teensy DSP Audio library, but from what I have seen it is running  in the Codec.
Regards,
Gary

Re: Poor Man's Panadapter?

John P
 

That's really neat! How long does it take to do the scan? How often do you do the scan? 
--
John - WA2FZW

Re: heat sink upgrade #bitx40 #parts

_Dave_ K0MBT
 

Thanks for the advice Skip. 
Did some long transmissions on 40 and indeed the power transistors did get pretty hot. I had not noticed it. 

Went to my box of computer parts and pulled out a nice brushless computer fan. Thought about putting a circuit to turn on the fan when the tx is on. After a couple of minutes I did the more expedient route and wired the fan directly into the power supply It runs anytime the PS is running. My experience with larger heat sinks is that a fan easily Trumps a larger heat sink. 

Re: Protoneer Nano-Arm #ubitx

Kees T
 

I was under the impression that the existing 2x16 LCDs could be used in 4 bit mode or 8 bit mode which would free up 4 pins.

Many alternatives ....OLED displays with IIC interfaces, etc etc.....but it drives the cost up.  

73 Kees K5BCQ

Re: Protoneer Nano-Arm #ubitx

Jerry Gaffke
 

You are correct.
However, they've already been freed up.
The stock Raduino has 4 data bits to the LCD.


On Tue, Apr 24, 2018 at 08:22 pm, Kees T wrote:
I was under the impression that the existing 2x16 LCDs could be used in 4 bit mode or 8 bit mode which would free up 4 pins.

Re: Wanted: your dead uBitx. #ubitx

Nick VK4PP
 

What's the problem?
73

Re: heat sink upgrade #bitx40 #parts

Skip Davis
 

Dave that’s a great idea with the fan powered on only when in transmit I might do the same thing here. I’ve got a few very small fans here salvaged from somewhere and they are quiet too. 
Have you done any other mods? I’ve done my version of the thump mod and waiting for parts to flatten out the driver amp response. I’m also doing the mic amp gain increase mod too.

Skip Davis, NC9O 

On Apr 24, 2018, at 23:15, davesters@... wrote:

Thanks for the advice Skip. 
Did some long transmissions on 40 and indeed the power transistors did get pretty hot. I had not noticed it. 

Went to my box of computer parts and pulled out a nice brushless computer fan. Thought about putting a circuit to turn on the fan when the tx is on. After a couple of minutes I did the more expedient route and wired the fan directly into the power supply It runs anytime the PS is running. My experience with larger heat sinks is that a fan easily Trumps a larger heat sink. 

Re: W8TEE TFT/VFO DDS adapter

Ross Smith
 

Any stray adapters left? Discovered a couple of spare boards in need of the dds variety that seems to have become unobtainium.
Ross
vk3ucr

Re: Poor Man's Panadapter?

Ashhar Farhan
 

Fabulous work,
Now, do two more things :
1. Using a volume control in the front end, measure the resistance at various settings and read out the readings on the analog port. 
2. Using this as a chart, you can produce a very accurate signal level to db chart.
Your spectrum analyzer is ready! 

On Wed, 25 Apr 2018, 08:12 John P, <j.m.price@...> wrote:
That's really neat! How long does it take to do the scan? How often do you do the scan? 
--
John - WA2FZW

Re: No PTT

geofftheasby@...
 

I should also say that the display lights up, saying "VFO A  7.150 MHz, it will not tune, although the encoder shows 5-0-5-0-5-0 at the pins as it is turned. Pressing the knob 'in' does nothing.  The audio produces a hiss and the volume control works OK.

Geoff

Re: Protoneer Nano-Arm #ubitx

William R Maxwell
 

and I have just done so.

Bill, VK7MX


On 25/04/2018 7:41 AM, Jerry Gaffke via Groups.Io wrote:
I got a Blue Pill with the 48 pin TQFP STM32F103 about a year ago, got it to speak Arduino just fine.
Of course, some Arduino libraries aren't ported, but it's a major step up from the Nano.
Blue Pill boards can be had for $2 each.

As I suggested a few posts back, if you build a board with the 64 pin TQFP STM32F103 you have a wide range
of processors to choose from.  From an ARM M0 core with 64k of flash and 8K of RAM  for $1 at quantity
up to an M4 core with 1024k of flash and 192k of RAM and floating point hardware for for $8.
All pin compatible, with 50+ pins of user IO.  
Here's the bottom end part:  https://www.mouser.com/datasheet/2/389/stm32f030f4-956260.pdf
and the top end:  https://www.mouser.com/datasheet/2/389/stm32f405rg-956214.pdf

Build our own board and we can choose our own processor frequency to avoid that 12mhz BFO,
and perhaps have the UART-to-USB connection happen in a cable so we don't 
normally have to deal with the 12mhz USB oscillator.

Though, in an attempt to stay on topic, I will admit that
it would be much easier to just buy the Protoneer.

Jerry, KE7ER




On Tue, Apr 24, 2018 at 02:08 pm, Kees T wrote:
The various STM "pill boards" sound promising and are --very-- cheap.....did you know there are 17 different STM32F103 products out there and the STM32F103C8 is one of the "simpler" chips. The chips themselves go from 36 pins to 100 pins. I see they all have a RTC.