Date   
Re: OT - EMRFD

Ken
 

hi hi...Thanks Roy


On Thu, Nov 7, 2019 at 9:56 PM Roy Appleton <twelveoclockhigh@...> wrote:
(shrug) I guess, I did.

Roy
WA0YMH

On Thu, Nov 7, 2019, 8:52 PM Ken <chase8043@...> wrote:
Everything is OK in joining?

On Thu, Nov 7, 2019 at 9:49 PM Roy Appleton <twelveoclockhigh@...> wrote:
Yes

Roy
WA0YMH

On Thu, Nov 7, 2019, 8:35 PM Ken <chase8043@...> wrote:
Sorry to post this here.

Is there anyone here who belonged to the EMRFD yahoo group and was contacted by a Andrea Baldoni to join his group?

Just wanting to find out if this is a valid group.

Sorry for the OT.

73

Ken VA3ABN

Re: OT - EMRFD

Roy Appleton
 

(shrug) I guess, I did.

Roy
WA0YMH

On Thu, Nov 7, 2019, 8:52 PM Ken <chase8043@...> wrote:
Everything is OK in joining?

On Thu, Nov 7, 2019 at 9:49 PM Roy Appleton <twelveoclockhigh@...> wrote:
Yes

Roy
WA0YMH

On Thu, Nov 7, 2019, 8:35 PM Ken <chase8043@...> wrote:
Sorry to post this here.

Is there anyone here who belonged to the EMRFD yahoo group and was contacted by a Andrea Baldoni to join his group?

Just wanting to find out if this is a valid group.

Sorry for the OT.

73

Ken VA3ABN

Re: OT - EMRFD

Ken
 

Everything is OK in joining?


On Thu, Nov 7, 2019 at 9:49 PM Roy Appleton <twelveoclockhigh@...> wrote:
Yes

Roy
WA0YMH

On Thu, Nov 7, 2019, 8:35 PM Ken <chase8043@...> wrote:
Sorry to post this here.

Is there anyone here who belonged to the EMRFD yahoo group and was contacted by a Andrea Baldoni to join his group?

Just wanting to find out if this is a valid group.

Sorry for the OT.

73

Ken VA3ABN

Re: OT - EMRFD

Roy Appleton
 

Yes

Roy
WA0YMH

On Thu, Nov 7, 2019, 8:35 PM Ken <chase8043@...> wrote:
Sorry to post this here.

Is there anyone here who belonged to the EMRFD yahoo group and was contacted by a Andrea Baldoni to join his group?

Just wanting to find out if this is a valid group.

Sorry for the OT.

73

Ken VA3ABN

OT - EMRFD

Ken
 

Sorry to post this here.

Is there anyone here who belonged to the EMRFD yahoo group and was contacted by a Andrea Baldoni to join his group?

Just wanting to find out if this is a valid group.

Sorry for the OT.

73

Ken VA3ABN

Re: uBitx V3 low power continues

Robert Freeman
 

Well done Ted!  This was helpful to me as well. 

73s de NQ0T, Robert 

Re: Does anybody know how to calibrate CEC firmware ?

d.maccallum@...
 

Attached please find my final cal numbers, i used the memory manager for the master cal tweaks by entering the corrected numbers directly into the display box for the calibration after i up loaded the current values from the MBITX radio then I down loaded changes and closed comm port and disconnected the USB cable. Did this till the MBITX freq display matched and tracked the display on of my KX2 radio. The BFO numbers were generated directly by cranking the numbers for best sounding audio using V1.2 CEC firmware in the MBITX radio.

Also I edited my spreadsheet calculator to handle computing the new cal number V5 last update.

You can test it and fix it if it does not work and pass it along to the group. Have fun..............

73 CU Later on the Bands....I am moving along now to install AGC control, 700 hz filter and tuning indicator..
I installed a BCI filter that I got off Amazon from RTL-SDR.com 2.6 MHz HPF Broadcast AM reject filter. I removed the filter board from it's case and wired it to the MBITX board works great! It's wired between the antenna relay and the receive relay K2 low power RX connection gonna install my AGC control in the same line..

Dave N8KZ

Re: uBitx V3 low power continues

Jerry Gaffke
 

The R82 collector resistor to ground (along with bias resistors R80 and R81) determines the quiescent DC emitter current through Q90.
Resistor R83 increases the gain at Q90 for AC signals with no affect on that quiescent current, since DC cannot go through C81.

Each stage of that power amp is increasing power by something like 10 or 15 dB,
so RF power generated by Q90 is down around 5mW.
And the RF power dissipated by the 2.2 ohms at R83 is an order of magnitude down from that 5mW.
R83 should not be getting hot.

Perhaps this was a stress fracture (if internal you would not see it even with a microscope), or a cold solder joint?

Jerry, KE7ER



On Thu, Nov 7, 2019 at 02:49 AM, Ted wrote:
I mean, I'm not entirely sure what the purpose of that capacitor + resistor is, in parallel with the bias resistor on that leg of Q90.

Re: Autuino 2.1 software

 

Here is the hex I used.

 73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: Does anybody know how to calibrate CEC firmware ?

David Forrest
 

The standard sources like the Tune Up page at  http://www.hfsignals.com/index.php/ubitx-tuneup/ (for v4, v5 is a bit different with the calibration, with the uBitx transmitting what it thinks is 10MHz while you detect and read the frequency from an external device) and http://www.hamskey.com/2018/05/how-to-calibration-ubitx.html tell you the mechanics of doing the calibration, but I think they miss explaining the purpose.

“Calibration / Set to Zero Beat” attempts to adjust the Raduino clock frequency to match a standard by adjusting to a reference signal.  The factory calibration likely gets you well within 10ppm, and that is close enough to work with—the frequencies indicated will be within 300Hz of the actuals, or 6 x 50Hz steps on the uBitx frequency dial.  If you chase after 1ppm accuracy, you could end up be chasing local temperature variations or remote frequency variations that are smaller than the 50Hz/30MHz=1.6ppm step of the frequency dial.

The BFO (also called "Carrier" or “usbCarrier” in the source code) is more important because it is the final IF frequency and is what gets heterodyned into audio.  V3&V4 boards use 12MHz (or 11995000Hz) and the V5 boards use about 11MHz (or 11053000Hz). Adjusting the BFO changes the IF heterodyning and with it the sideband window that gets filtered and decoded into audio, either including the carrier, warping the audio frequencies high or low, or pushing audio out of the filter bandwidth.

So, being mis-calibrated on the master calibration essentially makes your frequency reading on the dial off by a few steps or ppm, but being mis-calibrated in “BFO" interferes with the LSB/USB signal decoding and thereby the audio quality.

Dave


On Nov 7, 2019, at 9:00 AM, Adrien F4IJA <adrien.grelet@...> wrote:

Hi there,

I try to figure out how to calibrate the CEC firmware in order to receive good signals.

I think I have understood how to set up the master calibration : http://www.tobeca.fr/f4ija/doku.php?id=ubitx:calibration

But now, I can receive only very few signals and I have to things I can change, that are the "Set calibration" menu and the "Set the BFO" menu.

On the internet, I didn't found anything satisfying on what are they used for, what are the values you change and the impact.

In the set calibration menu, you can go up or down with negative values, but what does this value stand for ?

Also, on the Set BFO, it seems that you can adjust around 12MHz, but what for ?

Thank you a lot if you have any informations about that :-)
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: Kit-Projects Restock Digital interfaces

Dennis
 

The files downloaded fb. Placed order. All is well.

Regards,
73, Dennis
W7DRW

Re: Kit-Projects Restock Digital interfaces

 

Dennis,

 I have tried to mail them a few times and they have been either blocked or lost to the sock monster. I would post them via my site but opencart will not allow me to directly link pdf's or other files without a customer purchase (trust me I don't like it either and am looking for a better option). That said I have no issue posting them here DigiBuildNew.pdf is the current version.

If they still can't be downloaded I will post them to my blog site or mediafire.

73
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Does anybody know how to calibrate CEC firmware ?

Adrien F4IJA <adrien.grelet@...>
 

Hi there,

I try to figure out how to calibrate the CEC firmware in order to receive good signals.

I think I have understood how to set up the master calibration : http://www.tobeca.fr/f4ija/doku.php?id=ubitx:calibration

But now, I can receive only very few signals and I have to things I can change, that are the "Set calibration" menu and the "Set the BFO" menu.

On the internet, I didn't found anything satisfying on what are they used for, what are the values you change and the impact.

In the set calibration menu, you can go up or down with negative values, but what does this value stand for ?

Also, on the Set BFO, it seems that you can adjust around 12MHz, but what for ?

Thank you a lot if you have any informations about that :-)
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Autuino 2.1 software

Dave Lucas <g6ajw42@...>
 

Please can somebody supply me with a working version of the above software I have corrupted mine and needless to say it's not working .l I have tried downloading the programs in github but have a few problems I just need to get the unit working again regards hopefully for your help Dave.

Re: uBitx V3 low power continues

 

Looks like I lost the bet!

It sounds more like a run of defective resistors maybe?  I can't imagine there is so much current that it exceeds the rating of the resistor. You could do a check for heating after a 30s TX or something. Modeling could show the current through it. 

Cheers!

Re: uBitx V3 low power continues

Ted
 



Michel,

I'm rather pleased that an obscure find such as this, helped someone else.  At least one or two transistors bravely gave their lives in the search for this fault, as weak output led to an assumption that Q90 was the issue.  Best wishes always.




Mark, 

"Denial" is a sneaky adversary in these pursuits; I mean, I'm not entirely sure what the purpose of that capacitor + resistor is, in parallel with the bias resistor on that leg of Q90. There's no denying that its important!

Having a strip of deer-tick sized 22-ohm resistors from the 2N2222 driver stages mod, I may just pair a few up and replace the R83 with a heavier "resistor" as a precaution. 



With appreciation,

Ted
K3RTA

Re: uBitx V3 low power continues

Michel Dupuy
 

Thanks Ted, a few days ago my output power had gone from 12W to 1W and reading your message this morning I checked and indeed the resistance R83 of 10 Ohms were cut off, I replaced it and I retrovated the nominal power. Indeed transistor Q90 instead of amplifying attenuated the signal. Thank you from F1GTX

Re: RF output when just keying the mike

Maurice Bersan <Vk6hly@...>
 

Thanks Raj, I tried 11.0555 but it was very much worse, however the setting I am using now is 11.055.995 and it sounds normal now.
Thanks again
Maurice

On 7 Nov 2019 1:47 p.m., Raj vu2zap <rajendrakumargg@...> wrote:

Set it to 11.0555 and see if it sounds fine and no carrier leak!

Raj

At 06/11/2019, you wrote:
>Thanks the help so far, yes it is a calibration/bfo settings issue. I still struggle to set them correctly. So I'm using factory default settings at the moment, works ok but sounds like it has to much trebble.
>Cheers
>Maurice
>Vk6hly





Re: RF output when just keying the mike

 

Set it to 11.0555 and see if it sounds fine and no carrier leak!

Raj

At 06/11/2019, you wrote:
Thanks the help so far, yes it is a calibration/bfo settings issue. I still struggle to set them correctly. So I'm using factory default settings at the moment, works ok but sounds like it has to much trebble.
Cheers
Maurice
Vk6hly

Re: uBitx RF Power Amplifier Standalone

JuanCarlos
 

Please send an email to Heriberto Tito Mendoza at
He design the new layout and tested it.
JuanCarlos

On Wed, 6 Nov 2019 at 12:55 PM <circular.simetry@...> wrote:
hello does anyone have the pcb layout for this amplifier ?

--


Qrv's, 73's

Mr.Juan Carlos Berberena Glez BSc.
WJ6C ex/CO6BG

www.frcuba.com (visíta mi website y déjame un mensaje usando "contacto")

“If you have a penny and I have a penny and we exchange pennies, you still have one cent and I still have one cent.  But if you have an idea and I have an idea and we exchange ideas, you now have two ideas and I now have two ideas.”