Date   
Re: Antuino

Bruce Hall
 

Farhan,

Thanks so much for your help and thoughts.  I assume you are seeing the same thing on your end?   I want to make sure this isn't just because of a single unit or bad measurement data.

Is there a way to see where in the receive chain the non-linearity starts?   In your talk you mentioned that the AD8307 had a very linear response.  Agree that 70dB would be good.

Bruce

On Wed, May 29, 2019 at 3:31 AM Ashhar Farhan <farhanbox@...> wrote:
I guess, we need a better post mix amplifier? probably increasing the current there will help? I am not sure where this non-linearity is coming from. I suppose at least 70 db of linear range will be good. this is about 50 db.

- f

On Wed, May 29, 2019 at 2:08 AM Bruce Hall <bhall66@...> wrote:
Farhan,

I tried a the mod you suggested and bypassed the IF stage.  In my case I removed the coupling caps on either side of the stage (C27 and C11), and soldered a new 100nF coupling cap between them (see attached).

I re-ran the return loss calibration and did a plot with the step-attenuator in place, also attached.   The graph is shifted down about 5dB.   I don't see good linearity until I add about 20dB attenuation.

Bruce


On Tue, May 28, 2019 at 2:06 AM Ashhar Farhan <farhanbox@...> wrote:
Bruce, it is possible that there is too much gain. You can remove R8 (2.2K) resistor that provides feedback to the Q1 transistor to switch off that stage and use a 0.1uf capacitor between C11 and C7 to bypass that stage. you will have to rerun the return loss recalibration routine before you can accurate readings. I will try these out at my end too.

- f 

On Tue, May 28, 2019 at 2:20 AM Bruce Hall <bhall66@...> wrote:
All,

Does anyone see gain compression at the higher dBm levels?  Or does everyone else see a linear response on their units?  I have been adding 20-30 dB of attenuation to get into the linear part of the curve, but this significantly reduces the useful range of the device.

I am wondering if there is too much amplification in the IF section.   What would be a good method to troubleshoot?

Bruce


On Wed, May 22, 2019 at 8:48 PM Bruce Hall via Groups.Io <bhall66=gmail.com@groups.io> wrote:
I took a few more measurements, adding in 3dB and 6dB steps at higher attenuation values.  It looks like the additional 3dB and 6dB steps are attenuating RF appropriately.  But the shape of the graph remains non-linear.   See attached.   

I am not sure what to try at this point; any suggestions?

Bruce



On Wed, May 22, 2019 at 3:35 AM Ashhar Farhan <farhanbox@...> wrote:
This is interesting. There could be two possible explanations:
1. There is gain compression. This is possible due to the two stage IF amplifiers.
2. The step attenuator is off-calibration.

One way to know is to measure readings of smaller attenuations at different attenuations. For instance how does the readings change between -50db and -53db as opposed to -10 and -13 db? My tests show quite linear relationship between actual attenation and db readings.

- f

On Wed 22 May, 2019, 6:06 AM Bruce Hall, <bhall66@...> wrote:
I have been playing around with the Anduino.   I inserted a step-attenuator between the RF input and RF output ports.  With no in-line attenuation, the measured RF output is -16 dBm.   As I added attenuation, the measured RF power predictably decreased.   The receiver bottoms out at roughly -70 dBm, and does not record levels any lower - which makes sense.  What I don't understand is the non-linear relationship at low levels of attenuation.  For instance, adding 3dB, 6dB, or even 12 dB of attenuation did not significantly change the Antduino's displayed power measurement.  Independently, I crudely measured the RF power using my oscilloscope, and the power output changes as expected.   I am curious what results others get with their units.    Why am I getting a non-linear relationship between attenuation and RF power?

On Tue, May 21, 2019 at 7:52 PM Ashhar Farhan <farhanbox@...> wrote:
Peeps,
I just landed back home an hour ago. I will start putting the documentation for the antuino together tomorrow.

- f

On Wed 22 May, 2019, 4:12 AM Glenn, <glennp@...> wrote:
Rob i had issue with fonts also.   I still can't find the correct glcd LIB either, did you?.

Keep in mind I am a novice at this but do have Jacks book.

What i think it should be is to have all the Fonts in a directory called "fonts". Fonts.h is just a list of the fonts used in the Sketch.
in the same directory as the sketch.

then change #include <fonts/allFonts.h> to "fonts/allFonts.h"   so when you run the sketch in the IDE, it gets the fonts from the sub directory /fonts

I have another problem though in that i can't find a zipped version of the fonts required to download. 

I found the fonts here https://github.com/johnmccombs/arduino-libraries/tree/master/glcd/fonts
But if I right click on each entry  "Save As" the downloaded files have extra characters in them making them unusable.

glenn
vk3pe







On Tue, May 21, 2019 at 11:53 PM, Rob Bleumer wrote:
Ho Ashhar
Same question from me and I got also problems with the line containing fonts/allFonts.
Perhaps part of the same.
Rob PA0RBL

Re: New Arduino Nano Every - new life for Ubitx software?

N5KBP
 

Does it use a crystal or ceramic resonator for the oscillator?
--
N5KBP

Re: Antuino

Rob Bleumer
 

HI all.
The AD3807 has a liniar responce 1dB but it is also logaritmic. Could this be the reason?
Rob PA0RBL

single usb for cat control & sound card #cat #ubitx #ubitx-help #arduino

Don - KM4UDX
 

hello!  When i got my sound card dongle and cat control working each in their own USB port on my Win10 laptop, I almost fainted from uBITX joy. It is reliable and works well. So time to move on. Hahah. 

 I now need to get the two usb devices working from one USB port on the computer. Every time I try to combine the cat control usb with my sound card dongle usb into a powered hub (or unpowered) so I can use just one USB port in my laptop, the sound works but the cat control doesn’t. I’ve tried messing with com ports, etc, but I eventually give up and go back to using separate USB ports on the old laptop. 



I’ve seen a post where a usb hub was used successfully to combine sound card and cat control, but I can’t duplicate the results. 

What am I doing wrong? What clue have I missed? What stupid user error?

Why do do I need to do this? Well...

After I get the single USB port solution on working on my win10 laptop, i’ll transition to a new   single board computer (atomic pi) with only ONE native USB port.  

Thank you you all for the help. 

Re: single usb for cat control & sound card #cat #ubitx #ubitx-help #arduino

Doug W
 

Don,
Something doesn't make sense.  I hate it when people say it works for me so it must work for you, but I am going to be that guy.  There should be no problem using a USB sound card and a CAT control cable on the same USB hub.  Can you post a screen shot of the ports listed in your device manager (or type them out)? 
--
www.bitxmap.com

Bitx40 Noob #bitx40help#smoke

matt.varkevisser@...
 

Hey All,

So I got a Bitx40 as a gift and wired it all up, I can hear static radio seems to be working but no display. I uploaded new code to the nano and promptly let out its smoke. I connected another nano let out its smoke again.

Today I bought another nano uploaded the code, smoke out again. I am assuming there is a pinout mismatch here and for sure I must be doing something wrong. Could someone please point me in the right direction!!

de ZS6MDV

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Joe,

Got the two screens running, 3.2 + 5 and standalone signal an analyzer. Trying to tackle something simple at first - When the spectrum is displayed on home page, the maximum frequency is not being displayed.

Played with color and position, but no go.  Going to look for foreground/background options net.

Have you made any changes since you last posted the file above?  I do see the spectrum issue. The space for the spectrum has been expanded, but the data that the main program is dumping only fills a portion of that space. Not sure if it is an application issue (only so much data) or that the output display field has not been expanded. Will take a look at that next.

73
Mark
AJ6CU

Mark

Re: Bitx40 Noob #bitx40help#smoke

Doug W
 

What exactly were you doing when you fried the first nano?  Was it still connected to the Radiuno?  Other than the display, were you able to tune around or do anything else?  Did you try adjusting the contrast pot before determining the display did not work?  I'm sure we can get to the bottom of this but we need more information.
--
www.bitxmap.com

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Joe Puma
 

When you say maximum frequency, do you mean  the numbers in the upper left of the spectrum screen?  I turned that off. I can show you where I commented it out. And maybe other things like color and positions. Let me put some notes together.  I haven’t made any changes so far. 

Joe



On May 29, 2019, at 11:24 AM, Mark Hatch <mark2382@...> wrote:

Joe,

Got the two screens running, 3.2 + 5 and standalone signal an analyzer. Trying to tackle something simple at first - When the spectrum is displayed on home page, the maximum frequency is not being displayed.

Played with color and position, but no go.  Going to look for foreground/background options net.

Have you made any changes since you last posted the file above?  I do see the spectrum issue. The space for the spectrum has been expanded, but the data that the main program is dumping only fills a portion of that space. Not sure if it is an application issue (only so much data) or that the output display field has not been expanded. Will take a look at that next.

73
Mark
AJ6CU

Mark

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Joe,

Thanks, obviously enough of a newbie i didn't recognize a comment. :-) Perhaps I need to go thru the tutorial before i do any damage. ...

73
Mark

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Joe,

I think I found where you commented out the max Frequency.  In the pre-initialize events "vis tDecode1,0" . changed that to vis tDecode,1 but had no impact....

Was there some reason you decided not to display the frequency?

Mark

Re: Bitx40 Noob #bitx40help#smoke

matt.varkevisser@...
 

The nano "head" with screen was not connected to anything. I just had the screen plugged into the board and the arduino powered via USB. I adjusted the pot and it's still worked.

Next time I switch it on the screen lit up but the display was dead.

Re: single usb for cat control & sound card #cat #ubitx #ubitx-help #arduino

Nigel G4ZAL
 

I think I was one of the first to add an 'all-in-one' USB solution inside a uBitx with a small 4 port hub?  I also did the 'cut the red wire' at that time.
I had posted it here... https://groups.io/g/BITX20/message/61484

and it also exists on ubitx.net, here... https://ubitx.net/tag/g4zal/

I do find that Windozey 10 has a habit of changing the COM port (serial port) on some boot-ups, eg one time it will be on COM5 and next boot it will assign COM6 - just something to be wary of.

I also made a similar box that sits externally on my FT817ND and has a 4 port hub inside with the USB sound card, USB Serial adapter and a USB GPS dongle, I use the GPS for accurate timekeeping via BkTimeSync - https://www.maniaradio.it/en/bkttimesync.html - works great when operating /P as it gives you your locator.

HTH

Nigel - G4ZAL

 

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Joe Puma
 

Remove the // in the top entry that start with //xstr

I think the second like was already commented out. 


image1.jpeg



On May 29, 2019, at 12:47 PM, Mark Hatch <mark2382@...> wrote:

Joe,

I think I found where you commented out the max Frequency.  In the pre-initialize events "vis tDecode1,0" . changed that to vis tDecode,1 but had no impact....

Was there some reason you decided not to display the frequency?

Mark

Re: uBITX will not turn on

giant
 

The raduino turns on when powered directly. My version is 5.1. I found this interesting as all the troubleshooting guides I've found were for versions 3 and 4. Is v5.1 very new? Could I be experiencing an issue with this version not documented in the previous versions?

I still need to figure out if I need another ground wire on the antenna in addition to the black and brown wires and where that would attach to (as seen in the video). 

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Joe,

Ok, definitely need to invest in that tutorial...   One last question, that vis tDecode1,0 was irrelevant?

73
Mark

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Joe Puma
 

Yes I would set that back to what it was. It would be great if Ian CEC would come to our rescue on some of these tasks but he’s busy with more toys for us to play with.  

Joe



On May 29, 2019, at 2:45 PM, Mark Hatch <mark2382@...> wrote:

Joe,

Ok, definitely need to invest in that tutorial...   One last question, that vis tDecode1,0 was irrelevant?

73
Mark

Re: uBITX will not turn on

Sam Tedesco
 

That's good news about the raduino. Is it possible to get a pic or two of the build so we can get a better idea of the wiring?

Re: single usb for cat control & sound card #cat #ubitx #ubitx-help #arduino

Don - KM4UDX
 

Doug and Nigel, yes so I'm trying to copy at least Nigel, and many others (which is good news).

As suggested, Win10 reassigned the cat com port from COM7 to COM13 when I put the cat usb cable into the usb hub.  No problems, I just change the com port in fldigi rig device control to COM13...but no.  While COM13 shows up in the dropdown list, and I can select it, nothing happens. After I do hit the save button  (which gets a thin dash outline, and just sits there), or click Save Config on the tab, no changes take effect. After I close fldig, and open it up, there are no changes in config. Hamlib is unchecked, and com13 is not selected. 

So it seems like I can't save the config, or there is some reason why I can't really select COM13 with the usb hub?  Is there something else I am doing?

Re: Nextion 5/Enhanced for KD8CEC 1.2?

Mark Hatch
 

Joe,

Reset everything from the original, made the one change you suggested and it "worked". Looks like some background color issues and positioning is not right (and perhaps the font is too small). 

Is there a reason why you originally commented it out?

73
Mark