Date   
Re: New file uploaded to BITX20@groups.io

Tom, wb6b
 

A great writeup. You have raised the bar for documentation for the rest of to follow.

Clever solution to the pseudo encoder interface.

Tom, wb6b
 

New file uploaded to BITX20@groups.io

BITX20@groups.io Notification <BITX20+notification@...>
 

Hello,

This email message is a notification to let you know that a file has been uploaded to the Files area of the BITX20@groups.io group.

File: VB_Software.pdf

Uploaded By: Dennis Zabawa

Description:
This document supplies additional information for linking a microcontroller with a SOTABEAMS, VariBeam (VB) module for use with a BITX/uBITX.

You can access this file at the URL:
https://groups.io/g/BITX20/files/VB_Software.pdf

Cheers,
The Groups.io Team

Re: Kit projects AGC install

EI4GNB
 

position the board and mark with a sharpie the spots where You need to expose copper below, then use a small flathead screwdriver, or anything small, flat and hard to scrape away the coating and expose the copper.. You don't need to use much force, just take Your time and get a good strip exposed at each spot. You don't want a sharp point for this, just a hard object. Then tin both the AGC board and the exposed spots with solder, and the rest should just be a matter of adding enough solder to make a good bond, once You have the AGC board aligned in place. Maybe use some masking tape to hold it in place if You have big fingers..

I agree that a dremel is not the way to go. they are the Uzi of power tools. look cute, but are utterly useless, unless you like damaging Your fingers and making lots of noise.

Kit projects AGC install

Kelly Mabry
 

Does anybody have any suggestions for how to do the drop in portion of this kit-projects AGC board.. switch is wired up..mounted on front panel.  I am dreading this due to a dremel tool with only high speed rpms and shaky hands.

Would an exacto or a box cutter be acceptable to scrape away the top of the trace to get to copper?

It seems this install goes in one general spot with very little room to spare. I will look at it more tomorrow and snap a picture or two to provide more Information about my concerns.
Any advice welcomed... 

73,
Kelly K5AID 

Re: First ubitx lsb contact!

Kelly Mabry
 

Haha i should have said miles... up to this point, i had not truly worked qrp. The satisfaction of building it, then operating it is awesome. Thank you all for collaborating with me on this project. Your suggestions and advice illustrates what I love about this hobby. So, just few things left to do before I build.... another one. Lol. Well i need to install the AGC mod from kit projects.

73,
Kelly K5AID 

Re: 18000km

iz oos
 

Well done especially considering we are at the lowest end of the cycle! At the highest or so, I guess in 2014, I had a 18000, ZL from Italy, with 3 watts (ILER20 qrp). The amps will still be very useful to hams who, listening to a nearby ham struggling with a qrp, want to show off their 'auxiliary leg'. It is really fascinating how far waves may travel with ridiculous power. Trying QO-100 geostationary sat at 18000km distance I had a QSO with 2w and a grid dish for WiFi (specs of the antenna state I could reach an access point at 56km far...)

Il 22/apr/2019 14:26, "Laurence Oberman" <oberman.l@...> ha scritto:
>
> Yep, with CW or JT65 (with error correction) you can do a lot with a
> very little.
> Great job
> Congrats
>
> On Mon, Apr 22, 2019 at 8:22 AM d balfour <davesters@...> wrote:
> >
> > 10000 miles Excellent. I got a ssb contact with a Australian ham on phone a couple of weeks ago.
> >
> > I wonder if the yahoos with amps are still going to be going strong when the bands come back.
> >
> >
> >
>
>
>

Re: First ubitx lsb contact!

Joe Puma
 

Lol well why don’t you send him to the guillotine for butchering the queens language. 

For folks in the US that don’t use or think about that pesky METERIC, saying 100m is understood by all who use Imperial. I would of said miles because I like to spell. To each their own. 

Btw I don’t think I’ve ever hear someone from the US say metric like that. Find better American friends. 


Joe
KD2NFC



On Apr 24, 2019, at 2:05 AM, Dexter N Muir <dexy@...> wrote:

175m? Barely a city block. 175 mi more like it, 285km! I really despair of US clinging to Imperial measure, when it butchers English language - Metric (NOT METERIC!) is so much easier: 300/f for w/l.
73 de ZL2DEX

Re: First ubitx lsb contact!

Dexter N Muir
 

175m? Barely a city block. 175 mi more like it, 285km! I really despair of US clinging to Imperial measure, when it butchers English language - Metric (NOT METERIC!) is so much easier: 300/f for w/l.
73 de ZL2DEX

Re: Audio AVC

Joe Puma
 

Someone needs to make a schematic for an AFD (automatic fossil delay) :)

Joe



On Apr 23, 2019, at 11:07 PM, William R Maxwell <wrmaxwell@...> wrote:

No issue with being considered a fossil but I really want to delay becoming a fossil!

Re: Audio AVC

William R Maxwell
 

No issue with being considered a fossil but I really want to delay becoming a fossil!

Re: First ubitx lsb contact!

Gigabyte
 

Congrats!


On Tue, Apr 23, 2019, 19:41 Kelly Mabry <kmabry2007@...> wrote:
Got my first contact with my little low power radio; AD4PF, Billy in Dyersburg TN 7.155.4 mhz my dial said 7.153.767
By the way, around 175m between Brinkley AR and Dyersburg, TN
Yahoo! 
What a great day!
73, 
Kelly K5AID 

First ubitx lsb contact!

Kelly Mabry
 

Got my first contact with my little low power radio; AD4PF, Billy in Dyersburg TN 7.155.4 mhz my dial said 7.153.767
By the way, around 175m between Brinkley AR and Dyersburg, TN
Yahoo! 
What a great day!
73, 
Kelly K5AID 

Re: Audio AVC

Jack Brabham - KZ5A
 

I like the TPA2016.    I've been using a 15W/ch class D amp to drive my main station speakers for 2 or 3 years and haven't noticed any RF noise.

One aspect of the uBitx AGC consideration I haven't heard much on is.... to what extent, if any, do strong signals outside of the recovered audio pass band, but inside the 45 or 12 mhz passbands affect the mixers and amps in the RX chain?   Is there an optimum max signal level?

73 Jack KZ5A








On 4/23/2019 5:30 PM, Tom, wb6b wrote:
On Tue, Apr 23, 2019 at 09:38 AM, James Lynes wrote:
Well since Atmel is now Microchip
I have the PICKit 4 Programmer/Debugger and now that Atmel is under Microchip the new PICKit 4 box will program PIC, AVR and ARM chips. Although I also have an Atmel ICE to fall back on when the PICKit does not handle a particular AVR chip. They are gradually merging their toolsets to handle PIC/AVR/ARM chips more seamlessly. So Microchip may cover all the bases.

The Nordic chips are interesting. When it comes to battery operation, some folks seem to prefer these. I bough a LoRa development module based on one of these chips. I use manufacture toolsets often, but the documentation from the LoRa development board is helter skelter. 

I'm learning more about these chips, as I ended up buying a genuine Nordic development board, a J-Link Programmer/Debugger and installed the Segger toolchain, so I have a known starting point before tackling the Lora board (and disorganized documentation) again. The Segger stuff is first class (fortunately it is supposed to be free to use with Nordic chips), but even with experience on multiple manufactures toolchains, culling through the many disconnected documents and connecting the dots, is making this toolchain one of the longest for me to get set up with. 

If Nordic chips get more support in the Arduino IDE it would be a real benefit to the casual user. I Like the ease of Arduino IDE with the consistent libraries and the (at least most of the time) just works programming environment. For the Arduino environment it might be good if they try supporting the inexpensive ST-Link V2 clone programmers to program boot loaders into the Nordic chips. 

Tom, wb6b



Re: wiring up a cw paddle ref 54899 #bitx20

Kelly Mabry
 

Update!! Success! But not without a casualty. I cut the speaker trace by accident, but i wired point to point to fix it. So now all i need do is plug the keyer paddle in and go!  

Note this is needed to be done only if you are using one of the amateurradiokits.in cases. This was good practice for the AGC from kit-projects.com but i'm scared to install it. Lol. I shook so much and i only have a cheap dremel knock off with one speed....high! But the switch is in my case, all i need to figure out is "how to drop it in"

73 for now...

Kelly K5AID 

Re: wiring up a cw paddle ref 54899 #bitx20

Kelly Mabry
 

No.  i am currently working  on the fix. More info soon.
73,
Kelly K5AID 

Re: Audio AVC

Tom, wb6b
 

On Tue, Apr 23, 2019 at 09:38 AM, James Lynes wrote:
Well since Atmel is now Microchip
I have the PICKit 4 Programmer/Debugger and now that Atmel is under Microchip the new PICKit 4 box will program PIC, AVR and ARM chips. Although I also have an Atmel ICE to fall back on when the PICKit does not handle a particular AVR chip. They are gradually merging their toolsets to handle PIC/AVR/ARM chips more seamlessly. So Microchip may cover all the bases.

The Nordic chips are interesting. When it comes to battery operation, some folks seem to prefer these. I bough a LoRa development module based on one of these chips. I use manufacture toolsets often, but the documentation from the LoRa development board is helter skelter. 

I'm learning more about these chips, as I ended up buying a genuine Nordic development board, a J-Link Programmer/Debugger and installed the Segger toolchain, so I have a known starting point before tackling the Lora board (and disorganized documentation) again. The Segger stuff is first class (fortunately it is supposed to be free to use with Nordic chips), but even with experience on multiple manufactures toolchains, culling through the many disconnected documents and connecting the dots, is making this toolchain one of the longest for me to get set up with. 

If Nordic chips get more support in the Arduino IDE it would be a real benefit to the casual user. I Like the ease of Arduino IDE with the consistent libraries and the (at least most of the time) just works programming environment. For the Arduino environment it might be good if they try supporting the inexpensive ST-Link V2 clone programmers to program boot loaders into the Nordic chips. 

Tom, wb6b


Re: uBitX For Sale #ubitx

Sam Tedesco
 

I'm interested if it's unbuilt. Whatcha want for it?

Re: Audio AVC

Dexter N Muir
 

If Class-D output is a problem, perhaps the pre-amp/processor could feed a conventional o/p stage? Or is that much available alone as a chip?
73 de ZL2DEX

Re: wiring up a cw paddle ref 54899 #bitx20

Mike Short
 

If you reverse the wiring on your paddle do you get dahs?

Re: Audio AVC

Jerry Gaffke
 

At $10 for a 2.8W class D audio amp operating from 5v, that looks nice.
Here's what the webpage says:
    I2C interface pins for setting gain, AGC configuration parameters, etc. 
 
So you would use the i2c interface when setting the volume or turning on AGC.
But the AGC action all happens internally to this board once you have set it up.
You don't need to constantly write to it via the i2c interface to make AGC happen.

Apparently worked for Nick.
But be careful with Class D amps.  They send high frequency square waves
out to the speaker, and if not filtered correctly that can be very noisy in a radio.

Jerry, KE7ER 



On Tue, Apr 23, 2019 at 10:13 AM, Ismo Väänänen OH2FTG wrote:
People seem to have tried I2C controlled digital AGC before, with TPA2016 amplifier.
Nick VK4PP seems to have had success with it.
https://groups.io/g/BITX20/topic/9586139
https://www.adafruit.com/product/1712

So digital AGC via I2C control is very much possible.