Date   
Re: 4.2” Nextion Bezel?

 

Thanks,

 

David A Posthuma, WD8PUO

1 (616) 283-7703

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Gary Hanson
Sent: Friday, August 31, 2018 9:00 PM
To: BITX20@groups.io
Subject: [BITX20] 4.2” Nextion Bezel?

 

David,



Here is a two step process to get a black plastic bezel for your Nextion display.



First, go to the ITEAD website and down load the 3d bezel zip file for the size of your display and unzip to your desktop.



Go here: https://www.itead.cc/wiki/Nextion_HMI_Solution#3D_printing_bezel

Next, go to https://www.3dhubs.com and go through their order process that requires that you upload the file from step one above.  You will need to indicate the color and the material you want to print with. I went with the cheapest and looks great.  The 3dhub company has great customer service.



Mine cost $9 including postage and took about 10 days.  Hope this works for you.



Gary, KJ5VW

 

 

Re: UBITX V3 TX GAIN VARIATIONS

ajparent1/KB1GMX
 

Jerry,

If you have been reading I've mentioned I have several amps that actually do work...

Bag, cat, QSX amp.  I've been beating the crap out of one and its by far one of
the most solid designs to date.  Simply put, its that good.  For those that say 
it can't be done the answer is its done at last count everyone of the ones built
in SA YOTA 2018  its not a fluke.

Hans did some fine work.

Allison

Re: UBITX V3 TX GAIN VARIATIONS

jim
 


On Friday, August 31, 2018, 3:11:21 PM PDT, ajparent1/KB1GMX <kb1gmx@...> wrote:


On Fri, Aug 31, 2018 at 12:41 PM, Jerry Gaffke wrote:


Allison
_._,_._,_



Imma gonna put this here, tho it really does not apply to either the post I'm replying to or the "gain variations" as such

If you want to know why the ubitx is generating all the "cruft" in the finals, look at the schematic especially L9 and L10.

Both are wound on ferrite cores ..Both have DC current flowing through them ..According to the rev. 4 schematic they are supposed to be 60 uH ...I measured the ones I removed from my radio 23 uH ...just for fun, i monitored the impedance variation through them while passing DC current through them  O ma current, 23 uH ...5 ma current gave 15 uH ...10 ma current gave 11 uH ...since these inductors pass 100 mA (according to the setup procedure ...who knows what the inductance is under operating conditions ...Flowing DC through a ferrite biases the magnetic domains in the ferrite ...Maybe it goes back most likely not....ANY ferrite us susceptible to permeability change under the influence of a DC biasing current ...Its doubtful your "spice" analysis will account for this ..

Make the finals look like the WA2EBY unit....Clean up the finals, then go chasing the remaining spurs (there are a few left I noticed)

Jim


Re: ATU for mBITX

ajparent1/KB1GMX
 

Jim,

>>one other thing on the Elecraft T1 autotuner.  I remember something that Wayne Burdick, N6KR (Elecraft founder and CEO) said about the T1.  During initial testing of it, he messed up and accidentally hit it with 100 watts for a brief period (It's spec'd for 20W CW max) and it survived.  Of course, this isn't recommended but it speaks well for Elecraft's product quality.  

Mine has survived accidents to much more than 20W.  And now the rest of the story... cockpit error... Running
QRP SSB QSO and we were getting fading on 40 so I hit the switch for the EBY amp (about 50W) and all was happy. 
Moved to 20M even remembered to change the band switch on the amp  and without thinking hit the T1 for
re-tune for 20M at about 50-55W,  it got weird and stopped with a bad match.   Reason the forward SWR detector
diode died.  The coils and caps can take it and tolerates a bit of abuse just don't tune at high power.

So yes I can recommend it and with no reservations. 
One of the best products I've built as a kit.

Allison

Re: CW PTT attack time to slow #ubitx

ajparent1/KB1GMX
 

Joop,

IF you don't mind grinding code where are many possible fixes.
I would suggest looking at V4.3 as it is a bit cleaner and more current.

The biggest issue is the software is a big loop and CW ke is checked
a few times in the loop.  Speeding up the loop is one thing.  Or making
the input interrupt driven so when there is an event it gets the processors
attention.

Allison

Re: UBITX V3 TX GAIN VARIATIONS

ajparent1/KB1GMX
 

Jerry KE7ER,

The key to make it fly is layout to avoid ground loops and parasitics and
attention to cooling and that includes the BS170s.

There are pictures of his board. and for that fact the Softrock.  Many devices will
tolerate high peak power if a little attention is given to cooling.

The reason the amp works well is the BS170s aren't being flogged to drive the IRF510s.
and both with care have enough gain for the task.  There is ample headroom as 10W
needs about .5W from them and they can do 1W.

It did run at 10W swept frequency for over an hour.  I was interrupted and forgot it,
while I was doing something else.  At the 10W power level I've not yet found anything
that kills it.  Even when running into reactive loads.

Allison

Re: UBITX V3 TX GAIN VARIATIONS

Jerry Gaffke
 

I'm convinced Hans did a good job.
Especially after seeing this in his post:
  "I am very grateful to Allison KB1GMX for her advice, encouragement, support and testing during the development of this Linear PA."

I'll be buying that amp, once Hans starts selling it..
Then cut off the back half of my uBitx with a hacksaw.

I had thought of the BS170 in regard to the uBitx in months past,
but figured it might be too lightweight when used as a linear.
And didn't fancy dealing with two more bias pots.

Will be interesting to see how Hans went about it


> Bag, cat, QSX amp.

I've heard of bag phones, though not bag HF linear amps.
And radio has been explained through the metaphor of a very long cat (or lack thereof)
But still seems a bit cryptic.


Jerry, KE7ER


On Fri, Aug 31, 2018 at 06:20 PM, ajparent1/KB1GMX wrote:
Jerry,

If you have been reading I've mentioned I have several amps that actually do work...

Bag, cat, QSX amp.  I've been beating the crap out of one and its by far one of
the most solid designs to date.  Simply put, its that good.  For those that say 
it can't be done the answer is its done at last count everyone of the ones built
in SA YOTA 2018  its not a fluke.

Hans did some fine work.

Allison

Re: CW PTT attack time to slow #ubitx

W2CTX
 

On w0eb.com webpage is NANO software that implements interrupt driven CW generation.  Also

eliminates the voltage divider scheme.  Also eliminates the need to switch between straight key

and paddle as both are always active.


rOn


On August 31, 2018 at 9:41 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
Joop,

IF you don't mind grinding code where are many possible fixes.
I would suggest looking at V4.3 as it is a bit cleaner and more current.

The biggest issue is the software is a big loop and CW ke is checked
a few times in the loop.  Speeding up the loop is one thing.  Or making
the input interrupt driven so when there is an event it gets the processors
attention.

Allison

KD8CEC v.1.095 CW Issue #ubitx #ubitxcw #ubitx-help

 

I am sure I missed this topic, but my keyer worked fine until I upgraded the firmware to KD8CEC's V. 1.095 for use with my 4.3-inch Nextion display. Since the upgrade, I can only use a straight key. What did I miss? 

Re: 4.2” Nextion Bezel?

Christopher Miller
 

He is getting a laser cut acrylic version. I offered to print a few if he provided the material to produce the object . Instead they went with laser cut acrylic. 

Ill get s copy of that object in case it comes up again and some one is ok with white or whatever color I happen to have. 

Re: ATU for mBITX

Tom, wb6b
 

On Fri, Aug 31, 2018 at 10:41 AM, Lawrence Galea wrote:
Google picatune ATU
I dust did. An interesting article with lots of good information.

http://sp-hm.pl/attachment.php?aid=413

Tom, wb6b

Re: VK4PP uBitx LPF BANK add-on Board

Timothy Fidler
 

The flaming obvious and yet trivial  has  just occurred. How are people going to mount the PCB as shown ?  Three hole posns at a minimum will be required for say 3.4mm holes.  Edge distances have to be allowed.  As long as it can be mounted on a bit of AL with a return on one side it can be bolted anywhere. As it stands it will have to be (hot melt glued ??) to something ..a bit like skyhooks required on some engineering projects in a way.   Even if people have to drill out prescribed rondels for the screw down on Rx of the board to keep the price down,  they still need to be nominated. 

Re: VK4PP uBitx LPF BANK add-on Board

MadRadioModder
 

My thinking is that this whole discussion of  butchering the uBITx board and cobbling in another board that, in itself, will have some sensitivities to things like cable runs and connections etc. will scare the unseasoned builder away from the uBITx completely. 

 

I used what I thought was a better solution for some of the hams near me… by simply jumpering/cutting out the whole LPF network… so there is raw straight from the PA RF at the output.  I then used one of Hans’ BPF modules outside the box with a minimal BNC to pins – BPF – pins to BNC that is about $5 worth of parts including the filter.  Now granted you must buy all of the filters for bands you want to operate… but it’s the same with any LPF replacement.  A complete board in an outboard box is even less scary to most.  Yes the rest of us will be at the uBITx endlessly with our hack saws, hot glue, and soldering irons… but that will only work for us hackish engineering students.


Virus-free. www.avg.com

--

…_. _._

Re: VK4PP uBitx LPF BANK add-on Board

Jerry Gaffke
 

Yes, it would be a lot easier to simply disable the LPF's and use external filters.
As per the final sentence here from long ago, keeps things very simple:  
    https://groups.io/g/BITX20/message/30530

Given the uBitx board layout, trying to get more power on the upper bands
will likely add to the spurs due to coupling from power amp to the IF stages.
Board layout around the IRF510's is not that good for 30mhz, and the upper
bands have more trouble with spurs.  I'd be happy with 80m,40m,20m,
which the current uBitx can do a reasonable job of using external filters.

But replacing the power amp would solve most of those issues. 
No need for the hacksaw, just disable the uBitx power amp.
Use coax for signals, I doubt the cabling will be much of an issue.
Can experiment with band specific filters in that coax from exciter
to power amp if necessary.

Still need to address mixer levels, IF gain distribution, and a layout issue
that allows the carrier to sneak around the 12mhz crystal filter.
But the uBitx does give us a very simple analog SSB exciter/receiver to work with.
Hacking up a uBitx to perform well with minimal cost and complexity
might help give direction to future versions from hfsignals.

Note that the G0UPL power amp will require nearly 20 dBm of power from the exciter. 
Final mixer of the uBitx exciter should have about -3dBm max going in (10 dB below
the 7dBm local oscillator), and loses 6dB.  So will want up to 30dB of gain between the uBitx
exciter and the G0UPL power amp, perhaps two MMIC's built ugly style
on the back of the uBitx.  Not exactly trivial.

Jerry


On Sat, Sep 1, 2018 at 06:29 AM, MadRadioModder wrote:

My thinking is that this whole discussion of  butchering the uBITx board and cobbling in another board that, in itself, will have some sensitivities to things like cable runs and connections etc. will scare the unseasoned builder away from the uBITx completely. 

 

I used what I thought was a better solution for some of the hams near me… by simply jumpering/cutting out the whole LPF network… so there is raw straight from the PA RF at the output.  I then used one of Hans’ BPF modules outside the box with a minimal BNC to pins – BPF – pins to BNC that is about $5 worth of parts including the filter.  Now granted you must buy all of the filters for bands you want to operate… but it’s the same with any LPF replacement.  A complete board in an outboard box is even less scary to most.  Yes the rest of us will be at the uBITx endlessly with our hack saws, hot glue, and soldering irons… but that will only work for us hackish engineering students.

 

Re: ATU for mBITX

Dennis Yancey
 

They are marginal at best... save your Money and get a better tuner...

--
72 and God bless
KD4EPG

Re: VK4PP uBitx LPF BANK add-on Board

Timothy Fidler
 

If it is done cleanly it could look quite nice. Specifically small copper lugs can be soldered on the bottoms of the existing control relay pins to attach to braided core Cu wires which are then hot melt glued to the underside of the PCB for strength and brought out to a  green plastic header male plug 
that is why I suggested the click in header carrying all voltage GND and the three signals to the PCB designer.

If there is a known good solution to the existing issues that does not require a masters in EE to source and solder up then A Farhan has a prayer at moving 
the remaining uBitx boards in Inventory.  Some people will chose to operate the thing unmodded and some with legal sensitivities will want a fix.

After that inventory is moved, I suspect a full rework of the PCB will be out of the Eastern Horizon. My guess. Hopefully with AGC  and so on. Maybe with BS170 x 2  in the driver stage . 

But what is set up as a standard as to what the relay control signals mean now will have to be carried through,  or all hope of  forward software compatibility will fly out the window. That is why a one of ten decoder to use those three lines makes a whole lot of sense even if it adds dollars to the price of the finished board. If you start pulling 15 and 17 metres off the table,  (combined filter) the multiband nature of the beast is compromised. 
 

Timothy E. Fidler : Engineer BE Mech(1) Auckland , NDT specialist AINDT UT /RT3 , MT2 
Telephone Whangarei   022  691 8405
e: Engstr@...



----- Original Message -----
From:
BITX20@groups.io

To:
<BITX20@groups.io>
Cc:

Sent:
Sat, 1 Sep 2018 08:29:31 -0500
Subject:
Re: [BITX20] VK4PP uBitx LPF BANK add-on Board


My thinking is that this whole discussion of  butchering the uBITx board and cobbling in another board that, in itself, will have some sensitivities to things like cable runs and connections etc. will scare the unseasoned builder away from the uBITx completely. 

 

I used what I thought was a better solution for some of the hams near me… by simply jumpering/cutting out the whole LPF network… so there is raw straight from the PA RF at the output.  I then used one of Hans’ BPF modules outside the box with a minimal BNC to pins – BPF – pins to BNC that is about $5 worth of parts including the filter.  Now granted you must buy all of the filters for bands you want to operate… but it’s the same with any LPF replacement  A complete board in an outboard box is even less scary to most.  Yes the rest of us will be at the uBITx endlessly with our hack saws, hot glue, and soldering irons… but that will only work for us hackish engineering students.


Virus-free. www.avg.com

--

…_. _._

Re: VK4PP uBitx LPF BANK add-on Board

ajparent1/KB1GMX
 

Timothy,

Have you ever looked at the board?  
Fixing the driver moved the problem sage back to the predriver and first amp.

Pulling bands at the time of its design was not considered as it was desired to
have a 3-30mhz radio unbounded by "bands".   I agree a bounded transmitter
is a must  but at that time it wasn't heard.

Allison

Re: ATU for mBITX

ajparent1/KB1GMX
 

Dennis Yancey
   

They are marginal at best... save your Money and get a better tuner...

What is marginal at best?  Does it have a name or ?

Allison

Re: UBITX V3 TX GAIN VARIATIONS

ajparent1/KB1GMX
 

Jerry KE7ER,

>>I'll be buying that amp, once Hans starts selling it.. Then cut off the back half of my uBitx with a hacksaw.

And you have half a radio....  That amp expect about 12-14dbm drive from the radio its attached to.
That means for ubitx you still need about 32-34 db of gain hopefully not 3904s from the mixer output
to the amp...  and still need a band pass filters for the bands above 17M and low pass filters,
and there are issues with ground loops in the modulator and IF area.

Its total gain is about 26-28DB.  To get from the mixer output though filters and result in 10W you
need about 60DB of gain.    If you want even performance 3-30mhz you need to design that
predriver section to be flat.    Which by the way is half the reason why the current amp
has low power at 10M.

As to the comment > Bag, cat, QSX amp.  The cats out of the bag, and its a QSX amp.

Allison

Re: Which xmit transistor is blown?

ajparent1/KB1GMX
 

Sean,

Its been several days since you posted likely its eben seens and everyone
is going "I dunno".

   Not enough description of whats going on or not going on.
   Not sure of the mods done.
   Are you sure the power supply is working ok.

Everyone running FT8  without big fans seems to fry the amp and yet people
run FT8 and likely at max power possible.   While technically it ignoring spurs
and harmonics can there is insufficient cooling for sustained long transmit
sessions.  HINT: cooling required.

FYI hot is how hot?  You get a blister?  You don't what to hold your finger
there long?  You feel warmth but its not painful?

Many of the devices will heat to the very warm (about 140-150F).  That is not
deadly to the devices.  It will make things like bad soldering stand out and
maybe other marginal components fail.  Some have noted board level
issues like open vias.

Allison