Date   

Re: Good place to tap for PTT-OUT #v5

Jerry Gaffke
 

Yes, the TX rail has 12v on it whenever the rig is transmitting, 0v when it is not.
Probably your best choice, and easy to tack a wire on it.

Does your amplifier really want a 12v signal, or something more like 5v?
How much current will the amplifier draw from this signal?

I would think about limiting the current somehow, perhaps a series resistor inside the uBitx.
Otherwise a miss-wire in the cable could cause 10 Amps to flow, and lots of smoke.

Jerry, KE7ER


On Tue, Mar 16, 2021 at 10:38 AM, Rob French (KC4UPR) wrote:

I'm looking to add a PTT-OUT to the back panel of my uBITX, to control e.g. an amplifier or a switch to isolate an external SDR during transmit.

My thought is to grab C154/D11 or one of the other filter-switching relay circuits.  Those look like easy places to tack a short wire to without having to completely disassembly my uBITX.

Two quick questions:
(1) Dumb question... but that junction does provide what I want, right?  i.e. +12V on transmit.
(2) Any downsides to tapping the +12V on transmit, from that location?  e.g. some RFI effect

Thanks,
Rob KC4UPR


Re: 5.0" Nextion for uBitX V6 #ubitxv6 #nextion #ubitx6-help

K2ICC
 

Upgrade the regulator to feed the screen needs.


On Tue, Mar 16, 2021 at 6:28 PM Aaron K5ATG via groups.io <k5atg=yahoo.com@groups.io> wrote:
I'm wanting to upgrade to a larger Nextion and I came across this 5" one.
5.0" Nextion NX8048T050 TFT HMI USART Intelligent Touch Display LCD Module 16M

5" Nextion Display

Would it work with the uBitX v6 and would it be much harder to use than the 2.8 Nextion? 
Also, would a 5" Nextion be able to display more than the 2.8" or is everything on the screen is magnified? 
--
'72
Aaron Scott
QRPARCI# 16443
GQRP# 16389
4SQRP # 1080


Re: 5.0" Nextion for uBitX V6 #ubitxv6 #nextion #ubitx6-help

Evan Hand
 

Aaron,

I have not used a 5" screen.  I have used a 2.4", 2.8", 3.2", and a 3.5" Nextion.  They have all worked the same to the most extent, though some of the Nextion programs have more features than others.  I could not see any issue with going to the 5" display as long as you can find the right Nextion files for it.  There are some in the files section here and on ubitx.net.

One key thing to consider is the supply for the larger screen.  I would recommend adding a second 5volt regulator just for the larger screen.  I have seen them mounted to the case for heat transfer and then run the power to the screen with a common ground for the data lines.

To get a feel for what is in the Nextion program, you can use the Nextion editor and load the .hmi file then run in debug mode.

Above are my thoughts, you may want to wait to hear from someone who has used the larger screen.
73
Evan
AC9TU


Re: Power supply for uBITX ... 12V 3A

Arv Evans
 

Most switching supplies respond well to having a 0.1 mfd and a 4000 mfd
capacitors across the output, right at the power supply end of the cable.  It
is difficult to get noise through that combination.

Arv
_._


On Tue, Mar 16, 2021 at 7:58 AM <mikebw+groupsio@...> wrote:
I don't personally have one, but people who put these inexpensive switching power supplies on oscilloscopes to look at their output often recommend the Mean Well brand, which is almost twice as expensive (USD33) compared to the generic brands (USD18) but still quite reasonably priced.

https://www.amazon.com/dp/B0109IMRPS/ — MEAN WELL LRS-350-12 348W 12V 29 Amp Single Output Switchable Power Supply

The Mean Well LRS series is fine for amateur radio use, about half the price of the Mean Well RSP series that includes remote sensing (which would be of little value in this application).


5.0" Nextion for uBitX V6 #ubitxv6 #nextion #ubitx6-help

Aaron K5ATG
 

I'm wanting to upgrade to a larger Nextion and I came across this 5" one.
5.0" Nextion NX8048T050 TFT HMI USART Intelligent Touch Display LCD Module 16M

5" Nextion Display

Would it work with the uBitX v6 and would it be much harder to use than the 2.8 Nextion? 
Also, would a 5" Nextion be able to display more than the 2.8" or is everything on the screen is magnified? 
--
'72
Aaron Scott
QRPARCI# 16443
GQRP# 16389
4SQRP # 1080


Good place to tap for PTT-OUT #v5

Rob French (KC4UPR)
 

Hi,

I'm looking to add a PTT-OUT to the back panel of my uBITX, to control e.g. an amplifier or a switch to isolate an external SDR during transmit.

My thought is to grab C154/D11 or one of the other filter-switching relay circuits.  Those look like easy places to tack a short wire to without having to completely disassembly my uBITX.

Two quick questions:
(1) Dumb question... but that junction does provide what I want, right?  i.e. +12V on transmit.
(2) Any downsides to tapping the +12V on transmit, from that location?  e.g. some RFI effect

Thanks,
Rob KC4UPR


Re: Power supply for uBITX ... 12V 3A

mikebw+groupsio@...
 

I don't personally have one, but people who put these inexpensive switching power supplies on oscilloscopes to look at their output often recommend the Mean Well brand, which is almost twice as expensive (USD33) compared to the generic brands (USD18) but still quite reasonably priced.

https://www.amazon.com/dp/B0109IMRPS/ — MEAN WELL LRS-350-12 348W 12V 29 Amp Single Output Switchable Power Supply

The Mean Well LRS series is fine for amateur radio use, about half the price of the Mean Well RSP series that includes remote sensing (which would be of little value in this application).


Re: Power supply for uBITX ... 12V 3A

mikebw+groupsio@...
 

I've had no problems with RF noise from this supply:
https://www.amazon.com/dp/B01EWG6YT8/ — BMOUO 12V 30A DC Universal Regulated Switching Power Supply 360W

I did install ferrite chokes on the AC input and DC output cables, but as a precaution because I was not having any problem before:
https://www.amazon.com/gp/product/B088LNB2DT/ — Pack of 20pcs Clip-on Ferrite Ring Core Black RFI EMI Noise Suppressor Cable Clip



Re: Are all the Bitx version fundamentally the same?

Evan Hand
 

Eli,

Have you tried the "Fake It" setting in the WSJT-X setup?  It adjusts the radio frequency to allow for a wider passband.  An example would be moving the received (and transmit) frequency to allow get around the narrow SSB filter.  Opens up using frequencies above 2.8KHz or so.

A good and detailed explanation of the steps to use FT8 (or other) digital modes with the µBITX

73
Evan
AC9TU


Re: Are all the Bitx version fundamentally the same?

Robert AG6LK
 

Eli,

I have a a Signalink USB & I just came across this video on YouTube: https://youtu.be/dXha5UynvkE. 
Do you think if I made this cable for my Signalink interface & used a usb cable from the PC to the uBitx that it woul work? I don’t think I would need any other cables, would I?

What type of USB connection is on the uBitx v6, is the normal USB connector?

I know I’m throwing quite a few questions at you. I really do appreciate taking the time to help me out. Thank you.

Robert, Ag6lk 


Re: Are all the Bitx version fundamentally the same?

Eli, KO4LGS
 

Robert,
This is how I set up for FT8. I haven't tried much else. All of this is on a windows PC...although I have a rasperry Pi I may switch to.

I am doing the following:
1. Installed WSJT-X- https://www.physics.princeton.edu/pulsar/k1jt/wsjtx.html
2. Installed a timesynctool- https://forums.qrz.com/index.php?threads/wsjt-x-and-setting-windows-10-clock-seconds.592212/
3. Connect uBITX to PC via USB cable
   3a. Check Device Manager for COM port
4. Connect uBITX to PC via USB Sound Card- uBITX Mic to PC Earphone/uBITX speaker (front panel) to PC Mic
  4a. I had to "customize" the Audio cable from the USB soundcard to uBITX- https://groups.io/g/BITX20/message/84452
5. Turn On uBITX (with antenna connected)
6. Check Settings (configuration) in WSJT-X-
  6.a Radio
    Rig: Yaesu FT-817
    Serial Port: COM8 (based on step 3, not that this can change if you plug in to a USB hub instead)
     Baud: 38400
     Data Bits, Stop Bits, Handshake- All Default
     PTT Method; CAT
     Mode: USB
    Split Operation: Rig
    PTT method: CAT
  6b. Audio
   Input: USB Sound (step 4)
   Speakers: USB Sound  (step 4)
7. Cross fingers....

Actually, this worked well. WSJT is doing the PTT no trouble. I probably could have used the sound ports on my PC as well, but I had the USB device lying around, and could limit the sounds going to it while still hearing my PC through regular audio.

Contact me if you need more information.

Regards,
Eli
KO4LGS


   


Re: Are all the Bitx version fundamentally the same?

Jerry Gaffke
 

While we are on the subject of USB cables, be careful of those meant only for charging.

Many USB cables these days save $0.05 worth of copper wire by not including the data wires,
just power and ground wires.  These cables often provided free when you buy some electronic device.

More than once, I've spent hours chasing trouble when trying to download to a Nano
only to find that I have grabbed the wrong cable, which subsequently gets thrown in the trash.
Given the non-informative error messages you get from the Arduino-IDE, it's very easy to get hung up on this.

Jerry


On Mon, Mar 15, 2021 at 12:46 PM, Evan Hand wrote:
Jerry and Arv,
Thank you for the corrections.  I did get the mini and micro mixed up.  I guess the best bet is to wait for the Nano to be delivered and then match the connector on the board.

Robert
Hopefully, you have not ordered the cables yet.

I will delete the message that is in error so others are not confused.

73
Evan
AC9TU


Re: Let the upgrades begin! #ubitxv6

Eli, KO4LGS
 

Nice set up.

How did you connect the ATU antenna feeds to the uBITx?


Re: Are all the Bitx version fundamentally the same?

Evan Hand
 

Jerry and Arv,
Thank you for the corrections.  I did get the mini and micro mixed up.  I guess the best bet is to wait for the Nano to be delivered and then match the connector on the board.

Robert
Hopefully, you have not ordered the cables yet.

I will delete the message that is in error so others are not confused.

73
Evan
AC9TU


Re: Are all the Bitx version fundamentally the same?

Arv Evans
 

Jerry

I have older Nano boards that have the Mini-USB connector, but the
latest purchases all have the Micro-USB connector.  While this does
make the Arduino use same cables as cell phones, it also adds to the
confusion.  USB-Mini cables are getting more and more difficult to
find and purchase.

Arv
_._


On Mon, Mar 15, 2021 at 12:33 PM Jerry Gaffke via groups.io <jgaffke=yahoo.com@groups.io> wrote:
Good info. 
A minor correction: 
The Nano has a USB-Mini connector, not the USB-Micro that you find on most Android phones.
Jerry, KE7ER

On Mon, Mar 15, 2021 at 10:33 AM, Evan Hand wrote:
I have an EasyDigi board that I really only use the two isolation transformers.  For PTT I use the CAT capabilities with a Yeasu FT-857 radio setting.  The CAT connects through the USB port on the Nano and the PC.  The cable is USB-a on one end, and USB-Micro on the other (NOT the most recent USB Mini for android phones).  This is with the WSJT-X software.

A number of posters on this site have had success with a direct connection to a USB sound dongle.  I had RF and Groundloop issues, which is why I added the EasyDigi along with clamp-on ferrites to block the RF.

73
Evan
AC9TU


Re: Are all the Bitx version fundamentally the same?

Jerry Gaffke
 

Good info. 
A minor correction: 
The Nano has a USB-Mini connector, not the USB-Micro that you find on most Android phones.
Jerry, KE7ER


On Mon, Mar 15, 2021 at 10:33 AM, Evan Hand wrote:
I have an EasyDigi board that I really only use the two isolation transformers.  For PTT I use the CAT capabilities with a Yeasu FT-857 radio setting.  The CAT connects through the USB port on the Nano and the PC.  The cable is USB-a on one end, and USB-Micro on the other (NOT the most recent USB Mini for android phones).  This is with the WSJT-X software.

A number of posters on this site have had success with a direct connection to a USB sound dongle.  I had RF and Groundloop issues, which is why I added the EasyDigi along with clamp-on ferrites to block the RF.

73
Evan
AC9TU


Re: KA1 always on?

Rafael Diniz
 

Thanks Evan - will do the checks!

On 3/15/21 3:04 PM, Evan Hand wrote:
Rafael,

The code you provided looks correct, and the TXA output should be off
when one of the lower bands is selected.  Can you verify that the TXA
signal on the R151 / C153 junction is close to zero volts (below 0.3
volts)?  If so, then I would suspect that Q17 is shorted.  If it is
always high, then you may have a Nano issue.  Then there is always a
possibility that a solder bridge or short is in the signal line from
the Raduino to the Mainboard.  Verify that the Raduino is plugged in
properly.

73
Evan
AC9TU


Re: KA1 always on?

Evan Hand
 

Rafael,

The code you provided looks correct, and the TXA output should be off when one of the lower bands is selected.  Can you verify that the TXA signal on the R151 / C153 junction is close to zero volts (below 0.3 volts)?  If so, then I would suspect that Q17 is shorted.  If it is always high, then you may have a Nano issue.  Then there is always a possibility that a solder bridge or short is in the signal line from the Raduino to the Mainboard.  Verify that the Raduino is plugged in properly.

73
Evan
AC9TU


Re: KA1 always on?

Rafael Diniz
 

Hi Evan,

Thanks!

It is the v6.  I changed the firmware - I double checked the code I'm
using, and " digitalWrite(PIN_TX_LPF_A, 0);" is there in the lower bands.
https://github.com/DigitalHERMES/ubitxv6/blob/master/tuner.cpp

Still, I can measure KA1 is on.

Rafael

On 3/15/21 2:39 PM, Evan Hand wrote:
On Mon, Mar 15, 2021 at 12:11 PM, Rafael Diniz wrote:

Is the KA1 lpf to be always on even on 40m and 80m bands?
I feel there is something strange...

Rafael,

The answer depends on your mainboard version.  For a v6 board, the
answer is no.

Have you changed the firmware in the Nano replacing the stock firmware?

We will need a little more detail to answer your question.
73
Evan
AC9TU


Re: KA1 always on?

Evan Hand
 

On Mon, Mar 15, 2021 at 12:11 PM, Rafael Diniz wrote:
Is the KA1 lpf to be always on even on 40m and 80m bands?
I feel there is something strange...
Rafael,

The answer depends on your mainboard version.  For a v6 board, the answer is no.

Have you changed the firmware in the Nano replacing the stock firmware?

We will need a little more detail to answer your question.
73
Evan
AC9TU

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