Reason at Microsoft has always been focused on how to make more money.
Nothing else.
That's how they got so big.

There probably are plenty of people at Microsoft who like github and want to see it thrive.
But if the bean counters somehow determine that snuffing out github will allow them?
to sell $billions more of their own crapware, that's what will happen.
Plenty of precedent, some of it recent.

Could be that their corporate culture has changed to truly embrace open source,
not just embrace and extinguish.? ?But I'm not holding my breath.
Could be that management currently sees a future in letting github thrive more or less
as it is.? But that could?also change.

Jerry, KE7ER

Thanks to all of you that responded, it's good to know that I should be able to work on the SMD components if required.

Thanks Skip. I'll certainly try that before I think about removing R70... Do you think it's worth building the rest of the audio path as per Version 4?

If the mixers are getting hit hard enough to go into compression,?
then we don't really need 12dB of gain in that transmit side 45mhz amp.
May as well back it off to 8 or 6 dB, 0 dB is fine, whatever a 2n3904 can reliably do at 45mhz.
Buy it back with more gain in the little back-side daughterboard.

If we come to a solution here, I'm hoping it resolves mostly to stacking resistors on top of existing parts.
I assume we are just lowering that feedback resistor from collector to base, and then also the bias resistor
from base to ground by a proportional amount.
All stackable, so just put a new 1206 part on top of the existing one.
This happens at Q40, Q20, Q90, Q911, Q92, Q96 to reduce the gains.? Keep the 2n3904's.
?
The daughterboard could have more than a few parts, we have lots of room.
Most current owners will be much more inclined to do the mods if they don't involve replacing a dozen 2n3904's.
The daughterboard is easily reversible, just remove the wires from it to T8-5 and the top pin of RV1, then restore C82.
(T8-5 and RV1-1 are through-hole pins, easily accessible from the bottom.)

Maybe kit up the daughterboard along with some other needed stuff, such as parts for a dummy load?
and a diode RF probe.? Would add about $1 to the cost.

Jerry

Hi Dennis,

It looks like what you are trying to compile is, the code you would see if you clicked on "view source code" in your browser while looking at the code on GitHub. Of course, it is possible that something was temporary wrong at GitHub when you tried to download the code.

Try this link to download the zip file for the code.?

I believe the CEC firmware has compiled HEX files available. There were instructions for how to install a program on Windows that could program an Arduino from the HEX file. In my case, as I have a Mac, it was just easier to compile the CEC software and upload it from the Arduino Sketch.?

Hopefully the number of errors you get, if any, will be simple "not found" errors as Jack mentioned. Those would be the libraries you would install from the?"Sketch", "Include Library", "Manage Libraries" dropdown. Jack also points out that libraries can be downloaded directly from URLs, but I think anything needed for the factory firmware would be obtainable using the Sketch user interface.

Hang in there, much of programming and compiling seems counterintuitive. But, once you begin find your way around it starts to make sense. Once it all makes sense you've gone off the deep end and become a real programmer.

Side note: Hmmm. Maybe all those dire warnings about Microsoft and GitHub have so quickly become reality. After all, look at the first error:
"warning: missing terminating ' character

The deal hasn't even closed yet, and here we are...

Tom, wb6b

I went ahead and made the mod as suggested by Allard to improve the CW Carrier Waveform shape on the BITX40.??
The 2.2uF capacitor value to ground wasn't correct (I think Allard based this value on an earlier incorrect comment from me).
I calculated that the required capacitance to achieve a > 5mS rise time on the waveform as about 270 nF so I ended up
using both? a 220 nF and a 47 nF disc capacitor wired in parallel to approximate this.?

Previously I was using a 4K7 resistor between Raduino D6 and C107 for the carrier mod.? I checked output power on CW
as well as residual carrier on LSB with PTT closed with no mic audio, both before and after the mod and noticed no significant changes?
so I don't think that there are any undesirable side-effects from this mod.?

I don't currently have a working scope so I used my FLEX-1500 to monitor the transmitted CW signal from the Bitx40, connected to a dummy load.
PowerSDR has a scope view which allowed me to monitor the shape of the received BITX40 waveform with sufficient resolution to demonstrate a?
noticeable improvement in the the waveform shape.?

I have attached a couple of .PNG files that show the before and after cases. You can see that before the mod the CW waveform was very square looking, whereas
after the changes it has much more of a desirable trapezoidal shape. The received post-mod signal also sounds more pleasing to ear.?

Cheers

Michael VE3WMB?

P.S. Next on my list is to try providing an uninterrupted supply voltage to pin 6 of the LM386 by tombstoning? R111 and feeding the top end of it with +12V.
My hope is that this might reduce or even eliminate the remaining BITX40 audio thump on the TX -> RX transition.?

Too bad the Arduino IDE doesn't have a GUI interface to 'upload' a .hex (or .elf) file.
? ? This would make it easy to share a single 'compiled file'/ machine code and you could just upload to the Arduino.
? ? Easy enough to share the .hex, but the next battle will be you figuring out how to upload it.
There is software available for a P.C. that does

But I haven't found such for a mac, or have a way to test using an intel based 'modern' mac.

You don't have to be an accomplished 'C programmer' to use the Arduino IDE.

I don't see any libraries used in Farhan's supplied code that isn't part of the standard Arduino IDE.

Dennis,
I'd be happy to send you a single 'flat' ino file (the one that the Arduino IDE creates during the compile / linking process) in a private mail if this makes things easier for you to get going.
If you would like this, send me your email address by responding to this post with the "private" button, and I will send you a single file sketch.
I did not clean up the code that generates the compiler warnings.? I have checked that the single flat file? compiles and links.

Regards,
Gary

You may check www.rf-microwave . com.? They sell to universities, labs and hams. I bought quite nice stuff from them. Maybe they are not the cheapest but they have them... The owner I was told is or was an eme operator. In practice he is one of us.

I use 2 soldering irons to remove double ended SMD components (kind of like tweezers).
I often use this method over a hot air reflow station, which I also have, but prefer the low(er) heat approach.

Nigel.

On Wed, Jun 6, 2018 at 06:29 am, Jack Purdum wrote:

Missing libraries is a very common error that beginners make

So how do we beginners determine which libraries are missing and where to find them? I'm going to try this exercise on a win10 machine later today. Perhaps it will work better than the mac. I don't understand why we can't be provided with a single compiled file to upload to the Arduino. I would suspect that most hams are not accomplished programmers.

It may.? I've considered a compressor with peak clipper for the audio to hold
the level below the distortion point.? Then I looked at why we get distortion (spurs).
I'd still do the audio processing though as it has value other than spur control.

FYI the spurs are mixers hitting the compression point.

I may try a SRA1H and amp up the LO for the 45mhz spot.

Allison

开云体育

To Robbie and all that are when I installed the pop fix I connected it to M1 side of C51 which works. At this connection point it will not short out the audio to U1 and your side tone will work. ?The pop fix during TX is turning on the FET essentially grounding the audio input pin on the TDA2822, so yes there will be no side tone. By moving the FET to C51/M1 you will short audio as it comes off the Q70 preamp stage. This has been working for me for several months using Don’s simple 4 part pop fix, thanks Don :-)

Thanks Doug! And thank you for notifying me of the bad link. I still haven't figured out what went wrong so I deleted the link. Must be something stupid simple (my downfall!).
Don

For those wondering if the K5BCQ AGC and ClickFix kits work with the BITX40, they do! The AGC works just as well as in the μBITX and the ClickFix is, by far, the quietest modification that I have tried. The latter uses the PTT line for keying the receive preamp but that is all explained on the nd6t.com web site. No software changes are necessary unless you use the AGC board as an S meter source (which I recommend) and that is only to calibrate the display to accommodate the improved dynamic range. 73, Don

I was able to find one at Aliexpress:?
Came in a package of two for $US14.56.

-Michael VE1LEB

I probably reinvented the wheel but I figured out a trick that helps me with smd components.? I cut a small piece of plastic drinking straw and by sliding it down the tweezers they lock onto the component so you don't have to worry about dropping it.? Sure you can buy expensive tools that do that.? You can also buy an assembled radio.
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