Date   
Re: uBitX on CW #v6

Andy_501
 

Can't attain that low a setting on my V6. I get two choices 200 Msec or 100 msec and nothing else. TX indiciator is immediate but with standard hand key actual code signal and sidetone are way out of whack and no coincident with TX indicator at all

On 2020-01-27 08:13, Gil Palmer wrote:
From Lou KI5FTY, posted on the uBitx Forum:
 
 
"Found the problem with the transmit with trailing tone. In memory manager you can set CW DELAY (TX-RX) and it was set to 0. One would assume no delay. Not true, it must use some system default. Changing it to 1 (10ms) shortened the relay hang time to an noticeable amount and the wave form looks ok. 2 Questions:
 
1) is that a bug or undocumented feature ;-)
2) why would there be tone output while the relay is closed but no keyup?"

Re: UBITX6 arrived today - cracked display

support@...
 

Hello Paul,
 
The replacement TFT Display for your uBitx V6 has been dispatched vide India Post bearing Tracking Number. RN130082655IN dated 23-01-2020. Please allow a day for tracking details to reflect in the India Post website.
 
Contact us in case of any query. Do acknowledge receipt of the same.
 
Thanks and Regards,
 
Thomas
--
Support@...

Re: Receive filter

Jim
 

All,

Yes, I was right the first time -- the 747 is the weird old dual op amp, not the 7474.  However, the CWF-2 was a 3-position audio filter of 80-110-180 Hz bandwidths, and definitely MFJ.  Schematic here..  Certainly plenty of others out there, including the SOTAbeams variable and the Teensy 3.2 based DSP filter, Elecraft, 4-states, etc.

Re: uBitX on CW #v6

Gil Palmer
 

From Lou KI5FTY, posted on the uBitx Forum:
 
https://groups.io/g/BITX20/topic/39852896?p=,,,20,0,0,0::Created,,%23cw,20,2,0,39852896,ct=1&ct=1
 
"Found the problem with the transmit with trailing tone. In memory manager you can set CW DELAY (TX-RX) and it was set to 0. One would assume no delay. Not true, it must use some system default. Changing it to 1 (10ms) shortened the relay hang time to an noticeable amount and the wave form looks ok. 2 Questions:
 
1) is that a bug or undocumented feature ;-)
2) why would there be tone output while the relay is closed but no keyup?"

Re: v4 ubitx stuck in transmit

Gordon Gibby
 

Haul out the voltmeter and make the radio tell you where the issue is!   Turn down the pot that controls the power out,, so you don't damage anything, and then using the schematic, look for how T/R is controlled and check voltages until you find it   This is practice at using schematics and understanding DC circuitry.   Almost everything in that radio is either a common emitter amplifier or switch, or the occasional an emitter follower, so once you understand those transistor circuits, you can follow the operation of anything in there at DC.  


This is one of the topic areas on every FCC exam.   They gently lead you (Technicial level) from beginning to somewhat more advanced understanding of basic circuits (Extra Class).   This is one of the goals of 97.1

Great chance to learn!


On Mon, Jan 27, 2020 at 8:41 AM Raj vu2zap <rajendrakumargg@...> wrote:
One second thoughts search for a short/solder blob between RX and TX lines that when the LED will be white.

Raj

At 27-01-20, you wrote:
>Curt,
>
>Check your T/R line from diagram and see if there is voltage on it, then it will TX even with the raduino removed.
>I suspect a speck of solder shorting somewhere.
>
>Check K1 relay voltage on pin 8 and 9 - both should be 12V (means OFF) if one pin is 12 and other 0V then you may have
>a shorted Q15.
>
>Good luck!
>Raj
>
>At 27-01-20, you wrote:
>>Definitely a mystery.  I thought I was in final stages of mods - last step was installing a second 45 MHz stage in transmit path.  I powered on - found my ubitx stuck in transmit.  I removed radiuno - still stuck in transmit.  Finally I removed the xtal filter mod that was across R22 (yes I including a block cap and left the 50 ohm resistor) - still stuck in transmit - I do currently have nothing across R22 but that should not matter, I don't think for this circumstance. 
>>
>>Curiously, the bi-color LED is not showing red, but white - meaning I think both T and R might be engaged?  Anyway that's my only clue at the moment.  I guess next step is to see what is going on at the lower side of the board.  None of my mod activity seems to be in vicinity of TR circuitry so I am puzzled. 
>>
>>Okay back to studying schematic to see where I could cause this circumstance, apparently on the main board. 
>>
>>73 Curt




Re: v4 ubitx stuck in transmit

 

One second thoughts search for a short/solder blob between RX and TX lines that when the LED will be white.

Raj

At 27-01-20, you wrote:
Curt,

Check your T/R line from diagram and see if there is voltage on it, then it will TX even with the raduino removed.
I suspect a speck of solder shorting somewhere.

Check K1 relay voltage on pin 8 and 9 - both should be 12V (means OFF) if one pin is 12 and other 0V then you may have
a shorted Q15.

Good luck!
Raj

At 27-01-20, you wrote:
Definitely a mystery. I thought I was in final stages of mods - last step was installing a second 45 MHz stage in transmit path. I powered on - found my ubitx stuck in transmit. I removed radiuno - still stuck in transmit. Finally I removed the xtal filter mod that was across R22 (yes I including a block cap and left the 50 ohm resistor) - still stuck in transmit - I do currently have nothing across R22 but that should not matter, I don't think for this circumstance.

Curiously, the bi-color LED is not showing red, but white - meaning I think both T and R might be engaged? Anyway that's my only clue at the moment. I guess next step is to see what is going on at the lower side of the board. None of my mod activity seems to be in vicinity of TR circuitry so I am puzzled.

Okay back to studying schematic to see where I could cause this circumstance, apparently on the main board.

73 Curt

Re: neton screen to ver 6 board

Mick
 

Stuart.

Finally I got some time to gather the files together.

 

The hardware install is described in the  “ubitx-v6-…….modification file” file that WB2CBA – Barbaros Asuroglu put together.

The software upgrades are described in this link http://www.hamskey.com/2019/04/release-cec-firmware-v1200-for-ubitx.html

The Key steps are

  1. Make the hardware connections to the new screen as shown in the modification document.
  2. copy the ubitx_28.tft file onto a micro SD card (card of 1 to 16gb size)
  3. power off the radio, insert the SD card into the Nextion(bottom of screen), plug in the USB to the Arduino and to your computer. The file will automatically load onto the Nextion.
  4. remove the SD Card
  5. Unzip and Run the XLoader software then upload the file “UBITXV5_CEC_V1.200NX.HEX” (screen shot below) this file also works on V6

The hard part I found was getting the correct file combination. It’s all in the documentation but you have to dig to find it.

 

Hope this helps

73

Mick VA3EPM

Re: v4 ubitx stuck in transmit

 

Curt,

Check your T/R line from diagram and see if there is voltage on it, then it will TX even with the raduino removed.
I suspect a speck of solder shorting somewhere.

Check K1 relay voltage on pin 8 and 9 - both should be 12V (means OFF) if one pin is 12 and other 0V then you may have
a shorted Q15.

Good luck!
Raj

At 27-01-20, you wrote:
Definitely a mystery. I thought I was in final stages of mods - last step was installing a second 45 MHz stage in transmit path. I powered on - found my ubitx stuck in transmit. I removed radiuno - still stuck in transmit. Finally I removed the xtal filter mod that was across R22 (yes I including a block cap and left the 50 ohm resistor) - still stuck in transmit - I do currently have nothing across R22 but that should not matter, I don't think for this circumstance.

Curiously, the bi-color LED is not showing red, but white - meaning I think both T and R might be engaged? Anyway that's my only clue at the moment. I guess next step is to see what is going on at the lower side of the board. None of my mod activity seems to be in vicinity of TR circuitry so I am puzzled.

Okay back to studying schematic to see where I could cause this circumstance, apparently on the main board.

73 Curt

Re: v4 ubitx stuck in transmit

Mike Short
 

Did you possibly break/disconnect the resistors on the key jack? That will put it in transmit mode

On Sun, Jan 26, 2020 at 16:38 Curt via Groups.Io <wb8yyy=yahoo.com@groups.io> wrote:
Definitely a mystery.  I thought I was in final stages of mods - last step was installing a second 45 MHz stage in transmit path.  I powered on - found my ubitx stuck in transmit.  I removed radiuno - still stuck in transmit.  Finally I removed the xtal filter mod that was across R22 (yes I including a block cap and left the 50 ohm resistor) - still stuck in transmit - I do currently have nothing across R22 but that should not matter, I don't think for this circumstance. 

Curiously, the bi-color LED is not showing red, but white - meaning I think both T and R might be engaged?  Anyway that's my only clue at the moment.  I guess next step is to see what is going on at the lower side of the board.  None of my mod activity seems to be in vicinity of TR circuitry so I am puzzled. 

Okay back to studying schematic to see where I could cause this circumstance, apparently on the main board. 

73 Curt

Re: software update, Reed's code merged

Mick
 

Steve,
Glad I could help.
I have to give credit to those who recently helped me.
Ray K7OME provided the XLoader software
Reed provided the HEX file and many others added fixes to the software.
73
Mick VA3EPM

Re: software update, Reed's code merged

Steve Sawicki
 

Mick,
Many Thanks for being the ONLY member of this group that is providing the hex code as well as the XLoader software to accomplish the task to clear up the issues that where shipped with the "Christmas" shipment as well as adding display enhancements.
Yes I understand that this is a "Hobby" and I support it I still have the original BTX40 from 2014 that is mounted on a baking tin, and was programed by my now retired (defunct) XP Celeron laptop, yes it still operates  thus my interest in "Upgrading "  in 2020 to the V6
For information to some of the group members in my 45 years in the  communications  and information technology "industry"  I most likely built more experimental  "devices" and punched in more code then most (try doing machine code for a living then talk to me) I still dream in COBOL and mumble FORTRAN. 
I make  no apologies for sloppy coding and then having promulgating it to the user community, in my working world before one submitted code one checked every and ALL functions for CORRECT OPERATION, that is how we built some of the best SDR radio /transmitters almost 20 years ago yes they where large in comparison to today but they where "bug free" they had to be lives where dependent on them.
Hopefully the upcoming batch of V6 units will have ALL hardware and Hopefully stable code that others can enhance to make the V6 project shine like the BTX40 evolved.

Mick,
Again Many Thanks for your kind understanding and providing a understandably SOLUTION.
Best Regards.
73's
Steve AB2ET/4
.
   

Re: Receive filter

john
 

One correction if I may, you said "7474 op amp", which is wrong as a 7474 is a dual D flip flop. There should be a number of replacements for the lm747, both single and dual, that most likely are even better than the original. Please excuse me if I stepped somewhere I shouldn't have with this.

On 1/27/2020 12:13 AM, Ashhar Farhan wrote:
Peeps,
We maybe missing out two gems amongst us: 
The JackAl board (Jack is in the group) and the 
The two dollar BluePill filter written by Guisseppe. 
For those who may not recall it 

- f

On Mon 27 Jan, 2020, 10:32 AM Raj vu2zap, <rajendrakumargg@...> wrote:
You were right the first time. 7474 are flip flops I think.

At 27-01-20, you wrote:
>Sorry, where I said "the original was built with 747's, which I think are unobtanium now" I meant to say "7474s' which are a dual op-amp in a 16-pin DIP configuration.




Re: Receive filter

Gordon Gibby
 

Bill -- thank you for that very well explained answer!
gordon kx4z


On Sun, Jan 26, 2020 at 12:53 PM Bill Cromwell <wrcromwell@...> wrote:
Hi Bob,

I am guessing you meant BitX 40 and not ubitX 40.

Some of the noise performance depends on having the BFO set to the right
place. The uBitX has an SSB bandwidth IF filter. If you compare it to
your Omni you need to set the Omni up to use it's SSB filter. Otherwise
you are comparing apples to toothbrushes. There is just no way they are
related at all.

Assuming your uBitX BFO is right the easiest solution is an audio
filter. I have used the NEScaf filter and fldigi, Spectran, SpectrumLab,
and other software. Ten Tec used an active audio filter with the old
Argonauts for good CW performance after the SSB IF filter in the low
level audio stages. That filter is similar to many designs on the web
for active filters. I prefer the NEScaf filter for a stand alone (no
computer needed) solution. It has a variable center frequency and
variable bandwidth. It is like a solid state version of the National
"Selct-O-Ject". It can be used to help with SSB due to those features
and will narrow down to less than 100 Hz for CW. Among the computer
sound card choices I like Spectran best. It doesn't do a lot of other
tricks and is very effective and *simple* (like me). It is "Windows"
software but runs under WINE for the Linux users like me. The sound card
software solutions will also offer variable bandwidths to help with SSB
and in addition will give you "panadapter".

I hope this gives you some fodder to chew on and come to a good solution
for *your* station.

73,

Bill  KU8H

On 1/26/20 12:23 PM, Bob Bennett via Groups.Io wrote:
> My v6 is really noisy. Are there any instructions on how to adjust RX to
> reduce the ‘hash’. I tried the radio out during this weekend’s contests,
> comparing the receive to that of my Omni 6 and the uBITX needs some
> filtering.
>     I have not compared it against the uBITX 40 yet, but I do recall the
> 40’s receive to be a bit better
>
> --
> Bob
> NZ2Z
>
>

--
bark less - wag more



Re: Receive filter

Ashhar Farhan
 

Peeps,
We maybe missing out two gems amongst us: 
The JackAl board (Jack is in the group) and the 
The two dollar BluePill filter written by Guisseppe. 
For those who may not recall it 

- f

On Mon 27 Jan, 2020, 10:32 AM Raj vu2zap, <rajendrakumargg@...> wrote:
You were right the first time. 7474 are flip flops I think.

At 27-01-20, you wrote:
>Sorry, where I said "the original was built with 747's, which I think are unobtanium now" I meant to say "7474s' which are a dual op-amp in a 16-pin DIP configuration.




Re: Receive filter

 

You were right the first time. 7474 are flip flops I think.

At 27-01-20, you wrote:
Sorry, where I said "the original was built with 747's, which I think are unobtanium now" I meant to say "7474s' which are a dual op-amp in a 16-pin DIP configuration.

v4 ubitx stuck in transmit

Curt
 

Definitely a mystery.  I thought I was in final stages of mods - last step was installing a second 45 MHz stage in transmit path.  I powered on - found my ubitx stuck in transmit.  I removed radiuno - still stuck in transmit.  Finally I removed the xtal filter mod that was across R22 (yes I including a block cap and left the 50 ohm resistor) - still stuck in transmit - I do currently have nothing across R22 but that should not matter, I don't think for this circumstance. 

Curiously, the bi-color LED is not showing red, but white - meaning I think both T and R might be engaged?  Anyway that's my only clue at the moment.  I guess next step is to see what is going on at the lower side of the board.  None of my mod activity seems to be in vicinity of TR circuitry so I am puzzled. 

Okay back to studying schematic to see where I could cause this circumstance, apparently on the main board. 

73 Curt

Re: Receive filter

Bill Cromwell
 

Hi Jim,

That is probably one of the many fixed frequency filters. the Ten Tec unit I had included switch selectable CW wide and narrow (as well as bypass). The NEScaf types do not use op amps or precision resistors/caps.

I have no clue nor any concern who developed the op amp based filters but I suspect the Ten Tec unit predates the existence of MFJ. I see them published in ARRL Handbooks from "once upon a time". I could be wrong (not a show stopper). I was wrong once before <evil grin>. They can also live on dead bug ugly platforms:)

73,

Bill KU8H

On 1/26/20 4:33 PM, Jim wrote:
Sorry, where I said "the original was built with 747's, which I think are unobtanium now" I meant to say "7474s' which are a dual op-amp in a 16-pin DIP configuration.
--
bark less - wag more

Re: Receive filter

Bill Cromwell
 

Hi,

I don't think so. But check their web site. Google "New England QRP". I vaguely recall them making a run of these available again but some time ago. Maybe just the board. If you use dead bug ugly contruction you won't need much for a board. A proto should work well too if you want to mount sockets for the ICs etc.

73,

Bill KU8H

On 1/26/20 3:45 PM, wb2gxm@... wrote:
Bill, do you know if the NESCAF circuit board is available at least, from NEQRP or Far Circuits? Tnx & 73-Rich WB2GXM
/Sent from my MetroPCS 4G LTE Android device/
------ Original message------
*From: *Bill Cromwell
*Date: *Sun, Jan 26, 2020 1:39 PM
*To: *BITX20@groups.io <mailto:BITX20@groups.io>;
*Cc: *
*Subject:*Re: [BITX20] Receive filter
Hi Curt...
.....Bob,
The New England QRP Club doesn't have the NEScaf any more but parts are
still easily available and the last time I looked NEQRP still had the
circuit and instructions on their web pages. I am sure I have same here
(somewhere). It would not be difficult to build one using dead bug ugly
construction. If you build it into the radio you can leave out the LM386
type audio amp and place the filter between the volume control and the
audio chain. That type of build is still on my agenda.
Sometimes these appear for sale at reasonable prices on the net. If you
don't have the confidence to roll your own you could get one that way.
73,
Bill KU8H
On 1/26/20 1:05 PM, Curt viaGroups.Io <http://Groups.Io> wrote:
Bob
I am thinking same, that perhaps your BFO might be tuned to allow more high frequency noise through the IF crystal filter and a bit less of the signal.  Do look for specific instructions on v6 BFO alignment.
Secondarily, I am led to believe the xtal filter may be a little wider on v5/6 than our earlier units.  Like Bill I use a NESCAF with my v4, and I am working to integrate one of those into the case - as it helps SSB in addition to CW.  Unfortunately, last I looked NEQRP isn't selling them just now - an opportunity to fill maybe by our kit accessory merchants around the globe?
you didn't mention which contests ... my using an unfiltered uBITX on CW is a chore (yes I know that many of us did CW decades ago using the Rx we had!)
73 curt
--
bark less - wag more
--
bark less - wag more

Re: Receive filter

Jim
 

Sorry, where I said "the original was built with 747's, which I think are unobtanium now" I meant to say "7474s' which are a dual op-amp in a 16-pin DIP configuration.

Re: Receive filter

Jim
 

The audio filter that @KU8H may be referring to is the trusty old CWF-2 (which I think was originally an MFJ kit).  That circuit should be laying around the internet somewhere.  It's a good filter, but one could certainly upgrade it with modern op amps (the original was built with 747's, which I think are unobtanium now).

If you can't find it and are interested, I'll dig around my shack and see if I can find a schematic.  One thing to note -- high precision resistors are the key to this design.

73, Jim KK0U