Date   
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: 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: 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: 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!

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 

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: 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.

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: 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
 

Re: First ubitx lsb contact!

_Dave_ K0MBT
 

Kelly
175 is a pretty short (hard) skip, kudos to that.

I think you might now want to recalibrate your frequency display and you will need to move the bfo back on freq after.

I have worked my entire career in both US and Metric units, whichever seems easier or more easily understood for the job at hand. -

73
Dave
k0mbt

Re: First ubitx lsb contact!

Laurence Oberman
 

I do a lot of machine shop work as a hobby and I moved to the USA in
1996 from South Africa.
It took a while to get used to inches here in the machine shop.
Of course all machines can be used with inches or metric.
When on the road its Miles. In the shop its inches, but strangely when
doing home projects I use metric tape measures :)

KB1HKO

On Wed, Apr 24, 2019 at 8:25 AM d balfour <davesters@...> wrote:

Kelly
175 is a pretty short (hard) skip, kudos to that.

I think you might now want to recalibrate your frequency display and you will need to move the bfo back on freq after.

I have worked my entire career in both US and Metric units, whichever seems easier or more easily understood for the job at hand. -

73
Dave
k0mbt


Re: New file uploaded to BITX20@groups.io

Jack, W8TEE
 

Agreed; nice job. Note that, on the Arduino Nano and Uno, pins 2 and 3 are the only two pins capable of processing external interrupts. All other pins can process software or timer interrupts generated by the processor itself. If you're designing a Nano/Uno-centric project, it usually a good idea to leave pins 2 and 3 empty just in case you want to add an external interrupt later. Also, pins 0 and 1 are used for the Serial object that communicates with the USB link so, while they can be used as GPIO in a pinch, try to leave them free if you can.

Jack, W8TEE

On Wednesday, April 24, 2019, 8:08:48 AM EDT, Tom, wb6b <wb6b@...> wrote:


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
 

Re: Audio AVC

wb8lga
 

Yes I agree ESP32 is up for the Job. When we get Time I'm going to use one for DSP audio filter.  SSB/CW. and a AGC that controls the RF Attenuator .and move the S-Meter/DSP to it also.

The ESP32 has enough power to run it all with no other micro's needed.

WB8LGA

Charles


On 4/23/2019 2:18 AM, MadRadioModder wrote:

Wow!  Jack is an ESP32 convert!

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jack Purdum via Groups.Io
Sent: Monday, April 22, 2019 9:04 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Audio AVC

 

Exactly. Consider the ESP32 with 1.3Mb of flash, 350Kb of SRAM, all scooting along at 240Mhz at a price of around $6. It also has two DAC ports. While the DAC ports are only 8 bit, it's better than no DAC. Also, you can program the ESP32 from within the Arduino IDE. So far, I haven't found any libraries that don't work with it. Oh, it also has builtin WIFI and Bluetooth.

 

Jack, W8TEE

 

On Monday, April 22, 2019, 9:37:05 PM EDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

 

 

Doing AGC in software would incur added delay, especially with an i2c pot on our beloved little Nano.
We want to keep the attack time as short as possible.
Would be fun to try, perhaps using one of the small ARM processors with fast embedded ADC and DAC capabilities.
Jerry


On Mon, Apr 22, 2019 at 05:45 PM, Hasan Murtaza wrote:

Technically the simplest circuit (for some people) would be a software solution. Send the amplified output to a diode plus capacitor in a peak detector configuration. The capacitor voltage will be a quasi DC signal proportional to the maximum value of the signal. Read it into the arduino via an ADC pin. 

So far, component count =2.

Next replace the collector resistor in the class A common emitter amplifier with a digital potentiometer. Control the pot resistance (and hence the transistor amplification) with a digital output pin of the arduino. Write some software to set the gain based on the measured peak output voltage.

Total parts count is 3. 

If you sample the audio voltage directly you can do even fancier tricks like computing rms value or histograms etc.

Hasan


Virus-free. www.avg.com

--

…_. _._

Re: Audio AVC

Jack, W8TEE
 

We did all that and more with the JackAl board, but it's based on the Teensy 3.6 controller, which isn't cheap. We selected the Teensy because of its excellent audio processing library and still think that was the best choice...at the time. Since then, the ESP32 libraries have expanded, so that's probably a viable alternative.

Jack, W8TEE



On Wednesday, April 24, 2019, 9:05:01 AM EDT, wb8lga <cbeener@...> wrote:


Yes I agree ESP32 is up for the Job. When we get Time I'm going to use one for DSP audio filter.  SSB/CW. and a AGC that controls the RF Attenuator .and move the S-Meter/DSP to it also.

The ESP32 has enough power to run it all with no other micro's needed.

WB8LGA

Charles


On 4/23/2019 2:18 AM, MadRadioModder wrote:

Wow!  Jack is an ESP32 convert!

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jack Purdum via Groups.Io
Sent: Monday, April 22, 2019 9:04 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Audio AVC

 

Exactly. Consider the ESP32 with 1.3Mb of flash, 350Kb of SRAM, all scooting along at 240Mhz at a price of around $6. It also has two DAC ports. While the DAC ports are only 8 bit, it's better than no DAC. Also, you can program the ESP32 from within the Arduino IDE. So far, I haven't found any libraries that don't work with it. Oh, it also has builtin WIFI and Bluetooth.

 

Jack, W8TEE

 

On Monday, April 22, 2019, 9:37:05 PM EDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:

 

 

Doing AGC in software would incur added delay, especially with an i2c pot on our beloved little Nano.
We want to keep the attack time as short as possible.
Would be fun to try, perhaps using one of the small ARM processors with fast embedded ADC and DAC capabilities.
Jerry


On Mon, Apr 22, 2019 at 05:45 PM, Hasan Murtaza wrote:

Technically the simplest circuit (for some people) would be a software solution. Send the amplified output to a diode plus capacitor in a peak detector configuration. The capacitor voltage will be a quasi DC signal proportional to the maximum value of the signal. Read it into the arduino via an ADC pin. 

So far, component count =2.

Next replace the collector resistor in the class A common emitter amplifier with a digital potentiometer. Control the pot resistance (and hence the transistor amplification) with a digital output pin of the arduino. Write some software to set the gain based on the measured peak output voltage.

Total parts count is 3. 

If you sample the audio voltage directly you can do even fancier tricks like computing rms value or histograms etc.

Hasan


Virus-free. www.avg.com

--

…_. _._

Re: Raduino reinforcement, 3d printed

_Dave_ K0MBT
 

I printed these for club members with ubitx radios. I don't usually print black. It does terrible outside without being painted. Summer sun will melt it in 5 minutes.

I have had an Anet A8 printer. Paid 153 for it 3 years ago. It isn't expensive to get into. Have 2000 hours of printing out of it. Maybe a couple of dozen rolls of filament. Have tried ABS but didn't like the warm up time. With ABS the bed needs to get to 100 degrees, and the parts seem more likely to warp when cooling so I print with PLA. Be aware that printing 3d is not like printing on a sheet of paper. There are a 100 reasons to fail. It can be from a poorly designed object or a mechanical issue with the filament, dirt or the machine. Just ask anyone who has one. Mine will print happily for a couple hundred hours or more and then something goes haywire and needs to be adjusted. It takes about 40 minutes to print even a small part like the raduino bracket.

The real fun isn't the printing but the designing. I use Fusion360, a professional grade software that is available with a free license for the hobby and small business designer. The trick with designing something is that it should be easy to print. I use Repetier Host as a slicing software. Have tried several others but this usually sets up the print best.

Once you figure out what you can make you will be amazed. Take a look at thingaverse.com and you might get an idea. It isn't just for radio but most any component that is in a non hot location can be designed. All around our farm we have printed parts and brackets. Go to the hardware store trips have been greatly reduced.

Re: Kit projects AGC install

KE2GKB
 

Thanks for the response!
Kelly I just responded to your email, again apologies for the delay.
I have paraphrased below.

The only addition I have as of moment is that the castellations that you are soldering to the trace have copper on the bottom. Apply as little heat as needed, they make a solid joint easily. The solder should just start to come up the cup. It does not need to reach the top of the board. 
A decent example is in this picture 

73
KE2GKB


On Wed, Apr 24, 2019, 5:02 AM Playthatbeat Mrdj <playthatbeat303@...> wrote:
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.


--
Tim Keller - KE2GKB
https://shop.kit-projects.com

Re: First ubitx lsb contact!

RICHARD
 

The US put a man on the moon using INCHES !

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Dexter N Muir <dexy@...>
Sent: Tuesday, April 23, 2019 11:05:08 PM
To: BITX20@groups.io
Subject: Re: [BITX20] First ubitx lsb contact!
 
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!

Laddie
 

Its not our fault, back in grade school "they said, we would convert to metric before adulthood". I'm 64 and still waiting! Blame the British, imperial kings feet, arms digits and all.

----- Original Message -----
From: "RICHARD" <k6kwq@...>
To: "BITX20" <BITX20@groups.io>
Sent: Wednesday, April 24, 2019 12:29:40 PM
Subject: Re: [BITX20] First ubitx lsb contact!

The US put a man on the moon using INCHES !

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

________________________________
From: BITX20@groups.io <BITX20@groups.io> on behalf of Dexter N Muir <dexy@...>
Sent: Tuesday, April 23, 2019 11:05:08 PM
To: BITX20@groups.io
Subject: Re: [BITX20] First ubitx lsb contact!

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: Kit projects AGC install

digger AB3XU
 

Just so it doesn't get missed, don't forget that the one trace needs to get cut open.

Re: Audio AVC

bobolink
 

Here is my Arduino IDE dual core esp32 audio framework. Mainly just tone generation. I did fir filters with but haven’t uploaded them.
Audio Framework
Many libraries work but the esp32 unlike other Arduino processors, doesn’t like to spend a lot of time in interrupt routines (I guess because of rtos). I had to rewrite the “Talkie” library because of the interrupt handling.
Talkie

wm6h