sBITX


Niels Jalling
 

Hi

I captured the schematics from Ashar Farhans FDIM 2021 presentation "sBITX - An Open-Source SDR the YOU Can Hack!"

So I started hacking!
Attached is a rendering of my Sbitx board. The x-tals, transformers and coils are through hole components and will be mounted on the opposite side of the other components. RF-filter and tx-amplifier will be on another board. In the first setup I will use the lpf and bpf from qrplabs.
Size of the board is 50mm by 80mm.

I will mill and drill the board tomorrow and then begin mounting components.

I use an AudioInjector board that sits on top of a RPi4 and I can see a nice peak on the screen when injecting a tone. So the receive part of the software is working. The setup and compile was very easy.
I haven't tried the transmit part yet.

73 de oz9ny, Niels


Ashhar Farhan
 

Neils, 
There are a few minor mods. Don't get to pcb yet. Gimme another few days.

On Sun 30 May, 2021, 9:45 PM Niels Jalling, <niels@...> wrote:
Hi

I captured the schematics from Ashar Farhans FDIM 2021 presentation "sBITX - An Open-Source SDR the YOU Can Hack!"

So I started hacking!
Attached is a rendering of my Sbitx board. The x-tals, transformers and coils are through hole components and will be mounted on the opposite side of the other components. RF-filter and tx-amplifier will be on another board. In the first setup I will use the lpf and bpf from qrplabs.
Size of the board is 50mm by 80mm.

I will mill and drill the board tomorrow and then begin mounting components.

I use an AudioInjector board that sits on top of a RPi4 and I can see a nice peak on the screen when injecting a tone. So the receive part of the software is working. The setup and compile was very easy.
I haven't tried the transmit part yet.

73 de oz9ny, Niels


Tom, wb6b
 

On Sun, May 30, 2021 at 09:15 AM, Niels Jalling wrote:
I captured the schematics from Ashar Farhans FDIM 2021 presentation "sBITX - An Open-Source SDR the YOU Can Hack!"
Here is a link to the YouTube video of Ashhar's talk. As of my first skim through it looks really good.
https://www.youtube.com/watch?v=9mFxyS6_2t8

The part about the Arduino as a microphone audio processor is great. I have built a breadboard of the µSDX, just the audio and control, not the RF portions, so I can borrow the work they did, to create just that for my uBitx. But, also was going to implement an AGC for receive so when I get on the local club net, the sudden blast of audio level from the ham a 1/2 mile from me does not scare my cat so badly that he leaves scratch marks on me as he launches himself from my lap. 

The amazing thing is the uBitx seems to be handling the strong nearby signal with very little overload, meaning just an AGC (microprocessor or otherwise) will handle the problem. 

I was, additionally going to try to add a CW audio filter to the code. Now that I have waited (procrastinated) long enough, it looks like Ashhar will have done the majority of the work; likely better than I was planing to do. Waiting can pay off sometimes. 

I might up the processor from the Arduino Nano clone board to a Raspberry Pi Pico. As I have one, and for like a dollar more in cost, it might be more productive to use a better processor than engage in the sport and raw challenge of squeezing the last cycle out of the Nano. 

Tom, wb6b


Jim AJ8S
 

 Any chance that once your are ready you will post a PCB board on OSHPark or similar site along with a parts list here?

Enjoyed the talk and I am excited about the prospects. 73


Ashhar Farhan
 

Yes, i just got the digital board going. It works well on its own. I am going to plug it into the ubitx to test it out. I am planning to get a few made and populated (there are two, hard to solder ICs on it). 
I ran into problems with the switching regulator but it is under control, i presume.

On Mon 31 May, 2021, 7:59 PM Jim AJ8S, <aj8s@...> wrote:
 Any chance that once your are ready you will post a PCB board on OSHPark or similar site along with a parts list here?

Enjoyed the talk and I am excited about the prospects. 73


Aaron K5ATG
 

Yes, I would also be interested to see this as a board or kit available for purchase. 
--
'72
Aaron K5ATG


Evan Hand
 

Ashhar Farhan,

I too would be interested in a board set for the sBITX.

73
Evan
AC9TU


ghhann@...
 

So would I

Best

Glenn



Sent via the Samsung Galaxy A52 5G, an AT&T 5G smartphone


-------- Original message --------
From: Evan Hand <elhandjr@...>
Date: 5/31/21 3:18 PM (GMT-05:00)
To: BITX20@groups.io
Subject: Re: [BITX20] sBITX

Ashhar Farhan,

I too would be interested in a board set for the sBITX.

73
Evan
AC9TU


jerry@tr2.com
 

I was just thinking - kitting up a project like this is a lot of work. What if it was possible to send a Bill of Materials as a disk file - and we then submit that BOM to one of the major parts vendors - say Digikey or Mouser? As one operation?

Because pointing and clicking at Mouser for each & every part is a lot of work too...

- Jerry KF6VB

On 2021-05-31 13:14, ghhann wrote:
So would I
Best
Glenn
Sent via the Samsung Galaxy A52 5G, an AT&T 5G smartphone
-------- Original message --------
From: Evan Hand <elhandjr@gmail.com>
Date: 5/31/21 3:18 PM (GMT-05:00)
To: BITX20@groups.io
Subject: Re: [BITX20] sBITX
Ashhar Farhan,
I too would be interested in a board set for the sBITX.
73
Evan
AC9TU
Links:
------
[1] https://groups.io/g/BITX20/message/88905
[2] https://groups.io/mt/83191173/243852
[3] https://groups.io/g/BITX20/post
[4] https://groups.io/g/BITX20/editsub/243852
[5] https://groups.io/g/BITX20/leave/10189903/243852/952924773/xyzzy


Jim Sheldon
 

Jerry, nice idea, but won’t work. Companies like Mouser, Digi-Key and others’ warehouse personnel are only trained to pick parts by their part number, not work from a BOM and there would be far too many pick errors if they would even accept your order in the first place. They want EXACT manufacturers part numbers at a bare minimum but to get the order right, they really need their own part numbers. Speaking from many years dealing with them, especially Mouser, Digi-Key and Tayda.

Jim, W0EB

On May 31, 2021, at 3:35 PM, jerry@tr2.com wrote:

I was just thinking - kitting up a project like this is a lot of work. What if it was possible to send a Bill of Materials as a disk file - and we then submit that BOM to one of the major parts vendors - say Digikey or Mouser? As one operation?

Because pointing and clicking at Mouser for each & every part is a lot of work too...

- Jerry KF6VB




On 2021-05-31 13:14, ghhann wrote:
So would I
Best
Glenn
Sent via the Samsung Galaxy A52 5G, an AT&T 5G smartphone
-------- Original message --------
From: Evan Hand <elhandjr@gmail.com>
Date: 5/31/21 3:18 PM (GMT-05:00)
To: BITX20@groups.io
Subject: Re: [BITX20] sBITX
Ashhar Farhan,
I too would be interested in a board set for the sBITX.
73
Evan
AC9TU
Links:
------
[1] https://groups.io/g/BITX20/message/88905
[2] https://groups.io/mt/83191173/243852
[3] https://groups.io/g/BITX20/post
[4] https://groups.io/g/BITX20/editsub/243852
[5] https://groups.io/g/BITX20/leave/10189903/243852/952924773/xyzzy




Gerald Sherman
 

Also, there are those of us (and I am one) who lack the ability to handle surface mount.  I can only see with one eye, so I have no depth perception.

Gerry

Sent by the Thunderbird

On 2021-05-31 3:48 p.m., Jim Sheldon wrote:
Jerry, nice idea, but won’t work. Companies like Mouser, Digi-Key and others’ warehouse personnel are only trained to pick parts by their part number, not work from a BOM and there would be far too many pick errors if they would even accept your order in the first place. They want EXACT manufacturers part numbers at a bare minimum but to get the order right, they really need their own part numbers. Speaking from many years dealing with them, especially Mouser, Digi-Key and Tayda.

Jim, W0EB
On May 31, 2021, at 3:35 PM, jerry@tr2.com wrote:

I was just thinking - kitting up a project like this is a lot of work. What if it was possible to send a Bill of Materials as a disk file - and we then submit that BOM to one of the major parts vendors - say Digikey or Mouser? As one operation?

Because pointing and clicking at Mouser for each & every part is a lot of work too...

- Jerry KF6VB




On 2021-05-31 13:14, ghhann wrote:
So would I
Best
Glenn
Sent via the Samsung Galaxy A52 5G, an AT&T 5G smartphone
-------- Original message --------
From: Evan Hand <elhandjr@gmail.com>
Date: 5/31/21 3:18 PM (GMT-05:00)
To: BITX20@groups.io
Subject: Re: [BITX20] sBITX
Ashhar Farhan,
I too would be interested in a board set for the sBITX.
73
Evan
AC9TU
Links:
------
[1] https://groups.io/g/BITX20/message/88905
[2] https://groups.io/mt/83191173/243852
[3] https://groups.io/g/BITX20/post
[4] https://groups.io/g/BITX20/editsub/243852
[5] https://groups.io/g/BITX20/leave/10189903/243852/952924773/xyzzy





Shirley Dulcey KE1L
 

One catch is that the economies of scale of buying SMD parts can be huge. It's sometimes cheaper to buy 10 parts than to buy 2, and sometimes cheaper to buy 100 parts than to buy 20. The unit price literally goes down by a factor of ten when you compare buying 100 rather than one.

On the other hand, kitting something with a significant number of SMD parts is a real pain. You have to tag a lot of the tapes, especially the chip capacitors, because the parts have NO identifying marks; there is no way to identify them visually.

On Mon, May 31, 2021 at 5:17 PM Gerald Sherman <ve4gks@...> wrote:
Also, there are those of us (and I am one) who lack the ability to
handle surface mount.  I can only see with one eye, so I have no depth
perception.

Gerry

Sent by the Thunderbird

On 2021-05-31 3:48 p.m., Jim Sheldon wrote:
> Jerry, nice idea, but won’t work.  Companies like Mouser, Digi-Key and others’ warehouse personnel are only trained to pick parts by their part number, not work from a BOM and there would be far too many pick errors if they would even accept your order in the first place.  They want EXACT manufacturers part numbers at a bare minimum but to get the order right, they really need their own part numbers.  Speaking from many years dealing with them, especially Mouser, Digi-Key and Tayda.
>
> Jim, W0EB
>> On May 31, 2021, at 3:35 PM, jerry@... wrote:
>>
>> I was just thinking - kitting up a project like this is a lot of work.  What if it was possible to send a Bill of Materials as a disk file - and we then submit that BOM to one of the major parts vendors - say Digikey or Mouser?  As one operation?
>>
>>   Because pointing and clicking at Mouser for each & every part is a lot of work too...
>>
>>               - Jerry KF6VB
>>
>>
>>
>>
>>> On 2021-05-31 13:14, ghhann wrote:
>>> So would I
>>> Best
>>> Glenn
>>> Sent via the Samsung Galaxy A52 5G, an AT&T 5G smartphone
>>> -------- Original message --------
>>> From: Evan Hand <elhandjr@...>
>>> Date: 5/31/21 3:18 PM (GMT-05:00)
>>> To: BITX20@groups.io
>>> Subject: Re: [BITX20] sBITX
>>> Ashhar Farhan,
>>> I too would be interested in a board set for the sBITX.
>>> 73
>>> Evan
>>> AC9TU
>>> Links:
>>> ------
>>> [1] https://groups.io/g/BITX20/message/88905
>>> [2] https://groups.io/mt/83191173/243852
>>> [3] https://groups.io/g/BITX20/post
>>> [4] https://groups.io/g/BITX20/editsub/243852
>>> [5] https://groups.io/g/BITX20/leave/10189903/243852/952924773/xyzzy
>>
>>
>>
>>
>
>
>
>
>






jerry@tr2.com
 

On 2021-05-31 13:48, Jim Sheldon wrote:
Jerry, nice idea, but won’t work. Companies like >Mouser,
Actually, it looks like Mouser beat me to it. They
now have a system where you can upload a spreadsheet...

- Jerry


Paul k9mv
 

I would like to get the boards for constructing a sBITX, too.
-Paul  K9MV


allen west
 

I guess I have not been following as closely as I should.  But what is this sBITX?  When I joined this group it was for the BITX 20, 40 or the uBITX.  

THANKS, AL
KB4RA


On Jun 1, 2021, at 11:31 AM, Paul k9mv <k9mv@...> wrote:

I would like to get the boards for constructing a sBITX, too.
-Paul  K9MV


Jerry Gaffke
 


On Tue, Jun 1, 2021 at 08:42 AM, allen west wrote:
I guess I have not been following as closely as I should.  But what is this sBITX?  When I joined this group it was for the BITX 20, 40 or the uBITX.  
 


Rafael Diniz
 

Hi everybody,

I'm sorry, but after many messages, I also wanna know what sBITX is.
This link does not give any clue. Any link with the actual video of
Farhan speech?

Thanks,
Rafael

On 6/1/21 8:41 PM, Jerry Gaffke via groups.io wrote:
See   https://groups.io/g/BITX20/topic/82011726
<https://groups.io/g/BITX20/topic/82011726>

On Tue, Jun 1, 2021 at 08:42 AM, allen west wrote:

I guess I have not been following as closely as I should.  But
what is this sBITX?  When I joined this group it was for the BITX
20, 40 or the uBITX.  
 


Shirley Dulcey KE1L
 

The sBITX is a simple hybrid SDR; it uses a conversion to 27 MHz, a crystal filter there, and then downconversion to a near-zero IF where the signal goes into an audio ADC.

Here's a link to Farhan's talk about it at FDIM: https://www.youtube.com/watch?v=9mFxyS6_2t8


On Wed, Jun 2, 2021 at 2:07 AM Rafael Diniz <rafael@...> wrote:
Hi everybody,

I'm sorry, but after many messages, I also wanna know what sBITX is.
This link does not give any clue. Any link with the actual video of
Farhan speech?

Thanks,
Rafael

On 6/1/21 8:41 PM, Jerry Gaffke via groups.io wrote:
> See   https://groups.io/g/BITX20/topic/82011726
> <https://groups.io/g/BITX20/topic/82011726>
>
> On Tue, Jun 1, 2021 at 08:42 AM, allen west wrote:
>
>     I guess I have not been following as closely as I should.  But
>     what is this sBITX?  When I joined this group it was for the BITX
>     20, 40 or the uBITX.  
>      
>
>







Shirley Dulcey KE1L
 

I should add that it's a transceiver design, not just a receiver. The DSP is done by a Raspberry Pi 4. The talk first presents a modification of the uBITX, then goes on to show a new design that Farhan is working on.


On Wed, Jun 2, 2021 at 4:30 AM Shirley Dulcey KE1L via groups.io <mark=buttery.org@groups.io> wrote:
The sBITX is a simple hybrid SDR; it uses a conversion to 27 MHz, a crystal filter there, and then downconversion to a near-zero IF where the signal goes into an audio ADC.

Here's a link to Farhan's talk about it at FDIM: https://www.youtube.com/watch?v=9mFxyS6_2t8


On Wed, Jun 2, 2021 at 2:07 AM Rafael Diniz <rafael@...> wrote:
Hi everybody,

I'm sorry, but after many messages, I also wanna know what sBITX is.
This link does not give any clue. Any link with the actual video of
Farhan speech?

Thanks,
Rafael

On 6/1/21 8:41 PM, Jerry Gaffke via groups.io wrote:
> See   https://groups.io/g/BITX20/topic/82011726
> <https://groups.io/g/BITX20/topic/82011726>
>
> On Tue, Jun 1, 2021 at 08:42 AM, allen west wrote:
>
>     I guess I have not been following as closely as I should.  But
>     what is this sBITX?  When I joined this group it was for the BITX
>     20, 40 or the uBITX.  
>      
>
>







Rafael Diniz
 

Thanks a lot!

Reading the names of Farhan and Phil Karn makes me shiver! Wow!!

You are the ones!!!

Rafael

On 6/2/21 11:32 AM, Shirley Dulcey KE1L wrote:
I should add that it's a transceiver design, not just a receiver. The
DSP is done by a Raspberry Pi 4. The talk first presents a
modification of the uBITX, then goes on to show a new design that
Farhan is working on.

On Wed, Jun 2, 2021 at 4:30 AM Shirley Dulcey KE1L via groups.io
<http://groups.io> <mark=buttery.org@groups.io
<mailto:buttery.org@groups.io>> wrote:

The sBITX is a simple hybrid SDR; it uses a conversion to 27 MHz,
a crystal filter there, and then downconversion to a near-zero IF
where the signal goes into an audio ADC.

Here's a link to Farhan's talk about it at
FDIM: https://www.youtube.com/watch?v=9mFxyS6_2t8
<https://www.youtube.com/watch?v=9mFxyS6_2t8>


On Wed, Jun 2, 2021 at 2:07 AM Rafael Diniz
<rafael@rhizomatica.org <mailto:rafael@rhizomatica.org>> wrote:

Hi everybody,

I'm sorry, but after many messages, I also wanna know what
sBITX is.
This link does not give any clue. Any link with the actual
video of
Farhan speech?

Thanks,
Rafael

On 6/1/21 8:41 PM, Jerry Gaffke via groups.io
<http://groups.io> wrote:
> See   https://groups.io/g/BITX20/topic/82011726
<https://groups.io/g/BITX20/topic/82011726>
> <https://groups.io/g/BITX20/topic/82011726
<https://groups.io/g/BITX20/topic/82011726>>
>
> On Tue, Jun 1, 2021 at 08:42 AM, allen west wrote:
>
>     I guess I have not been following as closely as I
should.  But
>     what is this sBITX?  When I joined this group it was for
the BITX
>     20, 40 or the uBITX.  
>      
>
>