A bunch of $3 Nano clones is a good choice.
can hook them up to a few resistors plus some LED's and speakers and maybe a display,
will make a great introduction to programming.

If starting from scratch and no idea what you want to do with it,
one of the kits is not a bad bet:
? ??

If you mostly want to learn programming and are not interested in hardware,
install linux on some old windows machine.? Ubuntu linux is not a bad choice.
Comes with lots of programming tools installed, including support for C and Python
among several dozen other popular languages.


Jerry, KE7ER
?On Wed, Mar 14, 2018 at 03:44 pm, @bobbybailey wrote:

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I just went through that due to a failing hard drive.? It was starting to drop sectors, but showed the problem as lockups when accessing various subsystems, such as serial ports.? Replaced the spinning hard drive with an SSD drive, reinstalled the Linux OS and all is well again.

Ron W7HD

Found these on Amazon. Descent price. Good to have handy in the parts box.

73

Don Meyerhoff
WA2SWX

On Mar 14, 2018 4:28 PM, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> wrote:

Had never heard of Drok, they have lots of stuff up on Amazon.
Does your Drok allow you to set the max current anywhere from 0 Amps to say 5 Amps?
Sorely needed.

Lots of cheap switchers out there now, but none of them seem to deal properly with current limiting.
Should be able to set both the regulated voltage and the max current.
If the load sucks too much current, the voltage drops until the current comes within the set limit.

Any of those switchers could do this for the price of an op-amp and a pot, maybe an extra $1.

Jerry, KE7ER
?

On Wed, Mar 14, 2018 at 12:47 pm, Walter wrote:

A little more expensive model put out by droke even has a current limiting feature.

-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group.

File: uBITX_Programmers Reference.pdf

Uploaded By: Jim Sheldon

Description:
This is the programmers reference guide written by Jim Sheldon, W0EB and Ron Pfeiffer, W2CTX. It lists the uBITX cat commands so anyone wishing to write interface firmware for the uBITX will have our PC command list, how each command is formatted and how it affects the uBITX. This manual IS copyrighted by W0EB and W2CTX but may be freely distributed as long as nothing is changed and full credit is given to the authors.

You can access this file at the URL:
/g/BITX20/files/uBITX_Programmers%20Reference.pdf

Cheers,
The 开云体育 Team

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group.

File: ubitx_I2C4L_V3_00R.zip

Uploaded By: Jim Sheldon

Description:
W0EB/W2CTX latest firmware release for I2C equipped uBITX transceivers. This version works on ANY I2C enabled Raduino card with an I2C 4 line x 20 character display if you follow the instructions and works especially well on our "RadI2Cino" card (available from W0EB - email via the email listed on QRZ please, not on the group forum for details on the RadI2Cino) This is the FOUR line display version with fully implemented CAT and interrupt driven CW - swappable paddles, Iambic A and B keyer modes. Completely rewritten alignment mode that has proven to be quite accurate as well.

You can access this file at the URL:
/g/BITX20/files/ubitx_I2C4L_V3_00R.zip

Cheers,
The 开云体育 Team

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group.

File: ubitx_I2C2L_V3_00R.zip

Uploaded By: Jim Sheldon

Description:
W0EB/W2CTX latest firmware release for I2C equipped uBITX transceivers. This version works on ANY I2C enabled Raduino card with an I2C 2 line x 16 character display if you follow the instructions and works especially well on our "RadI2Cino" card (available from W0EB - email via the email listed on QRZ please, not on the group forum for details on the RadI2Cino) This is the TWO line display version with fully implemented CAT and interrupt driven CW - swappable paddle selection, Iambic A and B keyer modes. Completely rewritten alignment mode that has proven to be quite accurate as well.

You can access this file at the URL:
/g/BITX20/files/ubitx_I2C2L_V3_00R.zip

Cheers,
The 开云体育 Team

Also ordered 6 while having a leisurely beer to pass the time between screens.

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Mouser had them recently too...

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Maybe you can start with something like this?

So, exactly what math is this that was shown?
Perhaps post 44560?
Michael is only describing the conversion from 1'st IF to 2'ed IF,
he's quite aware the uBitx is double conversion.

Take a look at the math in this post of our current thread:
? ? ??/g/BITX20/message/44515
See anything wrong there?
I really am looking for somebody to vet it.
Especially the improved code in post 44278

Jerry, KE7ER

DHL package showed up. Didn't open it up to inspect tda chip. Will post when I find out.
Cory
N7FV

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On Wed, Mar 14, 2018 at 06:20 pm, ajparent1 wrote:

>>>The trick is if you take 45-33 your get -12?
(the minus means inversion in frequency in this case) or its 45-57 or 12 note the sign is positive or no inversion.

Got it backward and could not go back and edit.? should be...

?The trick is if you take 45-33 your get 12?(the minus means inversion in frequency in this case) or its
?45-57 or -12 note the sign is positive or no inversion.

For a multi conversion radio keep track of the sign to know what sideband is active.

Allison

From what I read its not a bitx20 or 40, so the math shown appleis to a single conversioon receiver.
The microbitx ubitx is very different as its DUAL CONVERSION. So any math shown is just plain
wrong to a degree.? ?Yes you can flip the 3rd oscillator for sideband change or the second of for
that fact is the oscillator can do? it the first!

First all signals are converted to the 45mhz first IF, makes no different if its 1.8mhz or 144mhz save for the?
1st LO is going to be above the IF or below it.? The second mixer and associated 2nd LO are being switched from?
45MH-12mhz=~33 or 45+12mhz=~57mhz and can be used to switch what sideband is in use just as easily as
flipping the 11.9978(give or take) and 12.500(also give or take).? The trick is if you take 45-33 your get -12?
(the minus means inversion in frequency in this case) or its 45-57 or 12 note the sign is positive or no inversion.

Also the fact that the first IF filter is 45mhz means images are not an issue all the way up to 432/450mhz or higher
as the image frequency is 90mhz away and easily filtered.? So with a decent RF (LNA) and appropriate filters?
VHF and UHF are possible with the same basic design though the Local osc the 1st may requires a multiplier
stage to reach UHF.? ? Its an positive artifact of using a high IF so the radio can tune the whole HF range without
switching filters other than the required low pass output filters.? Its a simplification of what most commercial
(YaIcKen) HF radios do.

Allison/kb1gmx

YaIcKen is Yaesu/Icom/Kenwood.

HI Farhan.
Does this mean V2 uBitx will have RD16HHF1 ??!?!

LOl, thanks,
73.

Plenty of errors to be found in comments and documentation, including mine.
Better off obsessing with how it works than what the documentation says.

> WOW. Has this always been there ??

Been there for awhile.
I doubt it's "trivial".
And for UHF, I'd use an Si5338 or Si5341 instead of messing with doubling the Si5351,
But yes, seems reasonable to do.
You can get years of tinkering out of that $109 investment,
if that's what you're looking for.

There are two tiny metal "tabs" or fingers in the arduino-nano mini-USB socket that can get hooked into the plug when it is first inserted (has happened to two different Chinese made nanos in our club). This will prevent the plug from going in far enough to make contact. They must be carefully pried up out of the way (don't accidentally hook one of the contact springy wires in the socket). Usually if you can get the plug to properly go in once, the little fingers will be bent up enough and won't cause further problems.
AL? VE3RRD