Date   
Re: max PA PWR voltage ?

Adrien F4IJA <adrien.grelet@...>
 

Thank you Allison for the answer. So if I put the PA voltage from 12v to maybe 16v it will not worth the pain regarding the final output power? 
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: UBitx v5 Not Saving Calibration or BFO adjustments with CEC v 1.20 Nextion

V Zecchinelli
 

Have you tried Memory Manager to see if anything changes?
I had problems at first because my changes didn't seem to take.
What I did:
Power off Ubitx and connect USB cable from Ubitx to PC
Start Memory Manager and press Connect to set communication with Raduino
Press Read From Ubitx
Press Decode and make note of calibration values
Shutdown Memory Manager and disconnect USB from PC
Power on
Make calibration changes and press PTT for about 2s and Calibration Set appears
Power down Ubitx and power on
Power down Ubitx and connect USB to PC
Start Memory Manager and again press Connect then Decode
Press  Read from Ubitx then press Decode
You should see your calibration values have changed

If values are not changing then there must be an issue with Nano I would suspect.
Hope this helps.
Vince

 


On 9/4/2019 4:43 PM, markix88@... wrote:
Thanks gary, yes i'ved tried to push ptt longer but nothing changed...yes i see "calibration set! Etc" message...on power on everything is lost...maybe a e2prom defect in the arduino? 

Re: max PA PWR voltage ?

ajparent1/kb1gmx
 

Running th efinal at high power with 100ma bias means that at 12V your heating
them at 1.2W no signal.  Bring that up to 24V and its 2.4W of heat.  

To run at higher voltages you need to insure the heatsinks and air circulation
are adequate.    Heat is a known killer.

However you will still be power limited as the drive level does not change with
increased voltage to the finals (separate power bus).  So the increase is notable
but not hugely greater.  HINT:  if you don't increase the power by a factor
of 4 the other guy will not have a clue (he will not hear it).

Allison

Re: UBitx v5 Not Saving Calibration or BFO adjustments with CEC v 1.20 Nextion

markix88@...
 

Thanks gary, yes i'ved tried to push ptt longer but nothing changed...yes i see "calibration set! Etc" message...on power on everything is lost...maybe a e2prom defect in the arduino? 

Re: New wiring diagram version

Ted
 




On Wed, Sep 4, 2019 at 12:12, Mark - N7EKU
<n7eku@...> wrote:
Hi Adrien,

See this post:  https://groups.io/g/BITX20/message/53765

73,


Mark.

Re: ?- How high SWR before smoke?

MVS Sarma
 

Hats off Allison for a nice treat in this poat . Messages are crisp and digestible. Many thanks

Regards
 vu3zmv

Re: max PA PWR voltage ?

 

Hi Adrien,

See this post:  https://groups.io/g/BITX20/message/53765

73,


Mark.

Re: New wiring diagram version

 

Hi Adrien,

See this post:  https://groups.io/g/BITX20/message/53765

73,


Mark.

Re: New wiring diagram version

Adrien F4IJA <adrien.grelet@...>
 

Jerry : that's OK, I've figured out why there is 2 power slots.

I've asked here another question though : https://groups.io/g/BITX20/topic/max_pa_pwr_voltage/33139548?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,33139548
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

max PA PWR voltage ?

Adrien F4IJA <adrien.grelet@...>
 

Hello,

What is the max PA PWR that can be supplied to the ubitx ? Also, what is the output power benefit to have more voltage on the finals of the PA PWR ?

Thank you,
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: New wiring diagram version

Adrien F4IJA <adrien.grelet@...>
 

Thank you Jerry,

For now I've just reworked the drawings, based on the old one. It's better quality and very good to print.

I've some questions on my side too :

What is really the difference beetween PA PWR and +12V ?

Isn't it more simple to enpower just by the Alternate power  with a switch, connected both on PA PWR and +12V all the time, even though you power the ubitx with battery or with DC supply ?
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: BITX shoes?

 

Hi,

This one looks like it has no low pass filters installed, thus it would be illegal to use in most countries unless band-specific low pass filters were used between the amp and antenna.

73,


Mark.

Re: Builder for Disabled

Curt
 

Eric

Wonderful offer. I don't know Thom but remember him from qrp-l. In my judgment a small team of builders can take turns working on his rig, in parallel with your own rigs.

Important is to find out what kind of enclosure he has, but even the standard supplied wiring is good. I see his email is on qrz.com. email him personally to see if he can drive, or whether you need to pick up his rig.

Your timing seems better, as we already finished much of our build here in Carroll County, more than 2 dozen rigs. Check out our K3PZN ubitx page for some good info.

Curt WB8YYY

Re: New wiring diagram version

Jerry Gaffke
 

Good to have an alternate drawing of how to wire up a uBitx.
We often have questions here from puzzled kit builders.

However,

The 2 reverse protection diodes should be after the fuses, not before, so the fuses
will blow if the diodes conduct.  Those diodes might conduct the full current of
a small supply, in which case it could work as is.  (Though they should be Schottky diodes.)
They could fail with a short at high currents, which is also ok.  Or they could blow
molten silicon across the room and be open when you plug in your 20 Amp power
supply backwards, in which case you will destroy many parts on your uBitx.

I would instead add a schottky diode (lower forward voltage drop than a 1n4007)
in series with the fuse for the main supply into the uBitx.  We can afford to lose 0.3 volts there.

No real need for reverse protection on PA-PWR, as the IRF510's have their own intrinsic
reverse diode.  You might burn a board trace or coil between the PA-PWR connector and IRF510,
this would be easy to fix.  But reversing the main 12V into the uBitx will blow 
a bunch of stuff (including everything on the Raduino), and be very difficult to repair.

The fuse for the main supply into the uBitx should be 1 Amp, perhaps even 1/2 Amp.
But definitely not 5 Amps.  2 Amps could be about right for the PA PWR, maybe 3
if feeding it 20V.

Opinions will vary, we've had long discussions here about reverse protection.
But I doubt many will say this drawing is correct.
I have not looked hard at it beyond the power supply connections.

Jerry


On Wed, Sep 4, 2019 at 05:27 AM, Adrien F4IJA wrote:
Hi everyone !

OK, you'll now find the new version of the wiring diagram in the wiki : https://groups.io/g/BITX20/wiki/uBITX-Assembly

You will now be able to download an HD PDF and also, in the CAD folder you will find the SVG source file : https://groups.io/g/BITX20/files/uBITX%20CAD%20Drawings
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: BITX shoes?

Sajid Rahum
 

I ordered RMItaly KL203 and will give it a short to work with ubitx once it arrives here.

Re: New wiring diagram version

Adrien F4IJA <adrien.grelet@...>
 

Hi everyone !

OK, you'll now find the new version of the wiring diagram in the wiki : https://groups.io/g/BITX20/wiki/uBITX-Assembly

You will now be able to download an HD PDF and also, in the CAD folder you will find the SVG source file : https://groups.io/g/BITX20/files/uBITX%20CAD%20Drawings
--
73's
Adrien F4IJA
https://www.qrz.com/db/F4IJA

Re: UBitx v5 Not Saving Calibration or BFO adjustments with CEC v 1.20 Nextion

Gary Anderson
 

On Tue, Sep 3, 2019 at 01:44 AM, Ian Reeve wrote:
I am sure you single push the encoder and not put to save settings
A quick look at the CEC 1.20 firmware!

code Snippet from void menuSetupCalibration:
//save the setting
  if (digitalRead(PTT) == LOW){
    printLineF1(F("Calibration set!"));
    printLineF2(F("Set Carrier now"));
    EEPROM.put(MASTER_CAL, calibration);
    delay_background(2000, 0);
  }

Mark, are you seeing the text in the above printLines after you push PTT? (I think I'm in the correct place in the code)
You may want to try holding the PTT button down for a longer duration.
PTT is used as one way to break out of a while() loop, and it is re-read later in the code to 'save the setting'
(pushing the encoder 'function' button is the other way to break out of the while() loop, when you DON'T want to 'save the setting')
Potential of a glitch the way the code is written for a short push of PTT, but just think "hold PTT until I see 'Calibration Set'" or the corresponding message  for any of the menus.

I haven't tested the code, just looked over it. Easy code patch to propose to Ian, if issue solved by a longer hold on PTT.

Regards,
Gary




Re: BitX40

Vaughn
 

Hi, is the same only the one in my instructions is turned 180 and has another board on top. All connections go to that one not the display one.

Got mine from hf signals. Good set of parts and lots of help.

Hope you get it sorted Vaughn

the mighty uBITX wispers loudly (as in WSPR digital mode) in 4th place for 2 way spot reports #antennas #cat

Don - KM4UDX
 

We all love our uBITX.  Did you know the uBITX makes a wicked good digital mode beacon station using WSJT-X's cool beacon mode called WSPR? Well it does.  We have a uBITX tied for 4th place in world-wide 2 way spot reports.  Note that the other folks in the top seed have expensive professional gear and full power. Our uBITX is running with the bulls and keeping pace with only moderate/QRP power.

Sterling performance credit goes to the CEC-based CAT control, WSJT-X's ability to direct band hops, and the generally excelent TX and RX performance of the uBITX design. On RX in particular, the uBITX has proven to be a world class receiver of digital modes -- the rig has very good ears and audio circuits. 

Here are the top 10 in deceding order of 2 way spot reports. The mightly uBITX is in 4th place (km4udx).  The number of 2 way reports per band is shown next.  Clearly the uBITX will work on more bands, but my antenna is the limiting factor.  For example, last month I worked 160 with my 80-10 DIY OCFD.  While the SWR was about >34,857, I kept the power down to 1 watt, and got a handfull of 2 way spot reports at medium distance. So 160m with no low pass band filter and no real antenna is no reason not to communicate. hahah. 

All hail the mighty wispering band hopping uBITX!


Yes I have cherry picked the data, but I get to do that. hahah

Don
km4udx

Re: BitX40

Jerry Gaffke
 

The 8 pin connector plugs into the top of the Raduino as shown here:
    http://www.hfsignals.com/index.php/2017/11/23/wiring-up-the-bitx40/
and the green,purple,yellow wires from that connector are soldered to the tuning pot.

Make sure all the spare wires from that 8 pin connector have tape over the ends.
There have been several instances here where a Nano on the Raduino was destroyed
when one of those wire ends hit something with 12v on it, perhaps the IRF510 heatsink.

Jerry


On Tue, Sep 3, 2019 at 04:03 PM, Roger Tuffin wrote:
Sorry Jerry.  Looking at the schematic I meant tuning not volume.  Where do a connect the tuning pot on my board as I only have the 8 way connector other than the pins some of which I’m using for the 5 way connector?
 
Roger, M0TJK