Date   
Re: RFI from uBitx TX after AGC and other mods installed

alans77@...
 

Don: I am referring to the AGC. My next step is to run shielded cable instead of a twisted pair between the volume control terminals and the the AGC board.

Alan

Re: RFI from uBitx TX after AGC and other mods installed

Don, ND6T
 

FB Alan! Got my fingers crossed. -Don

Re: I need a V3 or V4 uBitx board.

Jerry Gaffke
 

Tried again to post to kd1jvdesigns.
This time I noticed a "Your message will be sent when it's approved by the moderators"
at the top of the webpage after submitting the post.
So kd1jvdesigns is configured a bit different than this bitx20 group, 
though they are both hosted by groups.io.

I tried voting again, this time from the individual message webpage of post #161.
My vote was added immediately without review.

Steve  doesn't often respond to email.
But seemed odd he wasn't responding when he apparently still had a few boards to sell.
Perhaps he had a bunch of promises, but was waiting till the checks arrived.

I've bought 4 other KD1JV kits, first one in 2006.
They were all winners.
Manuals are very good, my only criticism is that schematics seldom quite agree with the board you get.
Steve seems to edit the design within his board layout program, then draw up the schematics without a netlist check.

Used to be he coded exclusively in assembly language, and I seldom find it worth the bother 
to get my head into somebody else's assembly code.  Or my own.
Steve has recently taken up residence in ArduinoLand, the Slop Bucket is coded in C. 

To bring this discussion around to some sort of Bitx relevance:
The Slop Bucket is comparable to the Bitx40, is a single band SSB/CW transceiver at 7W,
offered at a comparable price.   It's a full on surface mount kit using lots of 0805's and Sot23's.
You get to solder down your very own Si5351, wind your own toroids.

Jerry, KE7ER
 


On Sun, Jun 24, 2018 at 02:34 pm, Roy Appleton wrote:
Jerry, don't get too excited, between projects he often goes on extended hikes. He may be gone for a couple of weeks.
 
 

Re: ubitx code version 4.3 for review, testing

Craig Wadsworth <cwadsworth@...>
 

Neophyte question: The code is in several files. May different files be merged into the Arduino IDE as desired?

Re: I need a V3 or V4 uBitx board.

Roy Appleton
 

Those remaining kits where sold weeks ago.

Roy
WA0YMH

On Sun, Jun 24, 2018, 5:58 PM Jerry Gaffke via Groups.Io <jgaffke=yahoo.com@groups.io> wrote:
Tried again to post to kd1jvdesigns.
This time I noticed a "Your message will be sent when it's approved by the moderators"
at the top of the webpage after submitting the post.
So kd1jvdesigns is configured a bit different than this bitx20 group, 
though they are both hosted by groups.io.

I tried voting again, this time from the individual message webpage of post #161.
My vote was added immediately without review.

Steve  doesn't often respond to email.
But seemed odd he wasn't responding when he apparently still had a few boards to sell.
Perhaps he had a bunch of promises, but was waiting till the checks arrived.

I've bought 4 other KD1JV kits, first one in 2006.
They were all winners.
Manuals are very good, my only criticism is that schematics seldom quite agree with the board you get.
Steve seems to edit the design within his board layout program, then draw up the schematics without a netlist check.

Used to be he coded exclusively in assembly language, and I seldom find it worth the bother 
to get my head into somebody else's assembly code.  Or my own.
Steve has recently taken up residence in ArduinoLand, the Slop Bucket is coded in C. 

To bring this discussion around to some sort of Bitx relevance:
The Slop Bucket is comparable to the Bitx40, is a single band SSB/CW transceiver at 7W,
offered at a comparable price.   It's a full on surface mount kit using lots of 0805's and Sot23's.
You get to solder down your very own Si5351, wind your own toroids.

Jerry, KE7ER
 


On Sun, Jun 24, 2018 at 02:34 pm, Roy Appleton wrote:
Jerry, don't get too excited, between projects he often goes on extended hikes. He may be gone for a couple of weeks.
 
 

Re: KD8CEC - Nextion Display - IAN questions

Kevin Timm
 

Ian

I'm about to embark on the nextion journey and see that you support the 2.4 and 2.8 displays. Will the 3.2 work also, albeit with a smaller amount of screen real estate filled? 
73
K5KDT 
Kevin

Re: Understanding Spurious Emissions

ajparent1/KB1GMX
 

Farhan,

The filter are fine.  They work as they should for a low pass filter.  
The problem is 28mhz makes it though the respective low pass filters
and everything below 28mhz.

Allison

Re: Raduino consumption #ubitx #radiuno

f1mqj
 

Thanks Jerry, Vince, Ralph and others
I cutted the pcb to disconnect capa and socket REF pin from the AREF processor pin (if the problem have been a short capa or short circuit on this part of PCB it may erase the problem)

BUT no change : i've still contact (0 ohm) between AREF processor pin and ground (and 220mA if powered !)

So it looks like a bad nano board and i might have to change it (main problem is to extract it without destroying raduino PCB as we discuss early)
1-Do you know if I can get spare Raduino and how (#ubitxsupport #ubitxwarranty) ? perhaps i could get one as warranty feature, because mine never worked fine (if possible with nano socket, or without nano board -i've already some)
2-i'll try to borrow an air heater (looks fine for the job, Vince do you have a link to yours ? 852, 878) or use diagonal cutters (perhaps dremmel but i fear leaving a lot of small metal particles)
I'll give you news
73 - Remi

Re: Understanding Spurious Emissions

ajparent1/KB1GMX
 

Rahul,

I came to the same conclusion a while ago.  Your estimates of loss are a bit higher than
my measurements but we are talking maybe 2-3db but its all the same in that there is 
way too much TX path gain.

However the spur is visible when the input to the last mixer is -10dbm.

Also the balanced mod can be pushed harder to  maybe -13dbm is not bad and it helps
the carrier to signal ratio some.  The 12mhz filter in mine measures under 4DB loss when
modded for 2160hz bandpass.  My 45mhz us less than 5db loss.

I have the gains for TX 12mhz of 7db and 45mhz of 8db and its still high but 
closer.  That much gain is not needed as the modulator is already a fairly
large signal.

Allison

Re: Keypad for Raduino...?

Mark Pilant
 

Hi Jack.

That whole idea of using voltage to determine keyer state makes me nervous.
Even something as simple as corrosion on the contacts can make a difference.
True.

But then again I figure if I know how it works, and with some appropriate
debug code always built in, it would be pretty easy to track down a keypad
problem. Partially to address this issue, my SNA code has a min and max for
each key value and includes a calibration menu item to determine the average
value to use (which is then used to calculate the min and max). Not only does
this work for resistors that are slightly different values (but still within
tolerance) and can handle a slight variation in contact resistance as well.

If I wanted to really minimize contact issues, I'd use something other than a
(USD) $5-$10 keypad :-) I used the cheap one because the SNA started out as
not much more than a simple proof of concept. Funny how proof of concept
projects become the final project :-P

You are right, however, in that the problem has caused people to rethink the
problem(s) and that's almost always good.
I couldn't agree more. Maybe other will get some ideas from my SNA code. (I
haven't done a whole lot more with it since I picked up an HP 8591E spectrum
analyzer with a tracking generator. Although I was pleased to see my little
SNA agreed with the HP SA :-)

73

- Mark N1VQW

Re: BITX QSO Afternoon/Evening, Sunday, June 24, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Jay - WS4JM
 

Calling CQ and listening on 7.277

WS4JM

Re: I need a V3 or V4 uBitx board.

Jerry Gaffke
 

I sent the email weeks ago

Re: KD8CEC - Nextion Display - IAN questions

Ian Lee
 

Lowell,
Thnk you for your work.

LCDs usually consume much current in the backlight.
Decreasing the backlight brightness will certainly reduce current consumption.
Adjusting the brightness of the backlight generates noise. 
I think this is probably a problem with LCDs that use most inverter type backlights.
I think that the way to reduce the brightness in hardware is coming soon.
Perhaps users who use uBITX as Portable will also be able to use Nextion LCD.

Ian KD8CEC

2018-06-22 8:05 GMT+09:00 Lowell <lowell.haney@...>:

Just got in a 2.4 and a 3.2 Nextion display.  I'd seen some comments on the current draw and the possible need for a heat sink on the existing 5V regulator or maybe even a separate supply. So I just measured both on the bench.

Supply voltage was 5.04 VDC.
2.4 display was 125 ma.  3.2 display was 110 ma.  Both at full brightness.

These are both above (~25 to 35 or so) what is listed on the manufacturers website.

I did not check with the display in sleep mode.



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: Raduino consumption #ubitx #radiuno

Jerry Gaffke
 

Try sending email to    hfsignals at gmail dot com
Replace the "at" and "dot" with something more appropriate.
If they do send you a replacement it might take a month to arrive, and have import duty issues.

I know many electronics hobbyists use heat guns meant for embossing, or melting a colored powder into paper
Something like this:
     https://www.amazon.com/Nicole-Multi-purpose-Perfect-Embossing-Drying/dp/B006Z9LUDG
Likely the cheapest way to go.
But you could buy a full solder rework station, others in the forum may have recommendations of which.

Maybe cover the display connector and blue pot of the Raduino with cloth to protect them from heat,
cover the Raduino entirely with metal foil to further protect it from heat,
clamp the Raduino in a vice,
cut an opening in the foil to expose the Nano.
Blast away with the heat gun while tugging at the Nano, lifting the nano free of the pins it was soldered down to. 
Then remove the pins one by one from the Raduino using a soldering iron.

That will probably work better then cutting the pins, I had trouble when I did it that way.

Jerry 



On Sun, Jun 24, 2018 at 05:06 pm, f1mqj wrote:
So it looks like a bad nano board and i might have to change it (main problem is to extract it without destroying raduino PCB as we discuss early)
1-Do you know if I can get spare Raduino and how (#ubitxsupport #ubitxwarranty) ? perhaps i could get one as warranty feature, because mine never worked fine (if possible with nano socket, or without nano board -i've already some)
2-i'll try to borrow an air heater (looks fine for the job, Vince do you have a link to yours ? 852, 878) or use diagonal cutters (perhaps dremmel but i fear leaving a lot of small metal particles)
I'll give you news
73 - Remi

 

 

Re: KD8CEC - Nextion Display - IAN questions

Ian Lee
 

Kevin,

Yes, that's right,
I will only support 2.4 "and 2.8" for the time being. However, on my distribution list, you will find the GUI files for 3.2 "and 3.5".
They were converted to 3.5 "using the 2.8" GUI.
It will work normally, but it will probably look a little awkward. 
In the Nextion Editor, you can convert to a different resolution with a click of the mouse.

But I keep getting emails saying that I have successfully converted to 3.2, 3.5 "or even 7" LCD.
They work nicely by modifying the entire GUI to fit the LCD. 
You can ask them to get a 3.5 "file. But please wait for the beta version to finish. There are a few additional features to add.

Ian KD8CEC


2018-06-25 8:49 GMT+09:00 Kevin Timm <kevindtimm@...>:

Ian

I'm about to embark on the nextion journey and see that you support the 2.4 and 2.8 displays. Will the 3.2 work also, albeit with a smaller amount of screen real estate filled? 
73
K5KDT 
Kevin



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)

Re: New uBitx V3 QRP Transceiver For Sale $120 Shipped

alans77@...
 

Sold!

Schematic . . . What Schematic . . mine?

Russ KG0BK
 

As I worked on my uBitx I made changes . . .duh . . doesn't everybody?
As I progressed I found I forgot what I had hooked to what.
I used cardboard for my front panel to help make a template for control placement.
Easy to cut new holes or move the placement.
Forgot to document what I had wired to what and where.
Now I am wanting to install a push button to be able to read both board voltage and PA voltage.
Also adding a analog watt meter to the mix.
First picture shows work so far and has room to add the above controls.
All fine and well. . . except . . . I didn't make a schematic of what I had already wired.
2nd pic shows the other side with wiring.
As this was a proto-type I left most wires too long as to make easy mods. That's fine.
BUT I didn't document what I had already wired.
Now I have to retrace wiring to find out where to hook up new contriols.
Moral of story . . . Make notes and a schematic.
Sure will help id something becomes . . . disconnected.

Re: RFI from uBitx TX after AGC and other mods installed

RowlandA
 

Thanks Don, I'll try some RG-174 then.  I might not have time until Wednesday, flying out tomorrow for a two day trip, but will report back when I try it.

I assume one coax with shield to ground at both ends - unlike the RF gain control coax, which is two coax cables, grounded at the pot end but shields not connected at the AGC board.  Let me know if that's not right.

73,
Rowland K4XD

Re: #ubitx-help advice needed-display issue #ubitx-help

entilleser@...
 

So, then, regarding the wire-up of the jack/switch/fuse/et cetera:  Positive pole of jack to one pole of fuse: other pole of fuse to one pole of switch: other pole of switch to red and brown wires of radio power connector.  That it???  Also, negative pole of jack to one pole of second fuse: other pole of second fuse to black wire of radio power connector, and to black end of diode: ring end of diode to positive pole of power jack.  Yes???

Re: Nextion Display vs 1602 LCD - Current Consumption #ubitx

 

Today I upgraded my uBITX (v3) to use KD8CEC v1.094 and a Nextion 2.8" display, so I am now able to answer my
previous question about current draw of the display and whether the L7805 regulator on the Raduino board is up to the task
of powering this display. 

Prior to doing the upgrade I measured my RX current draw as 162.5 mA, running off of a 12.5 v SLA battery. 
A previous posting to this group established that the 16x2 LCD Display draws about 21 mA so the rig + Raduino (without LCD) should
be around 142 mA

With my Nextion 2.8" Display and backlight set to 100 % I am now seeing a total current draw for the uBITX of  250 mA.

That indicates that my 2.8" Nextion Display is drawing about 108 mA.   

The L7805 regulator on the Raduino board is rated for at least 1A so it should be fine with a 250 mA total current draw.

I did go ahead and put a heatsink on it and I even used some silicon-based heatsink compound. 

For fun I took a meat thermometer and held it against the Heatsink and I got a reading of 56.5 C !
The rig had been powered up for over an hour.  This part is rated for up to 150 C. 

My recommendation is that if you are going to add the Nextion Display you should  put a TO-220 compatible heatsink on the L7805 5V regulator on the Raduino board.

Cheers

Michael VE3WMB