Date   

Re: uBitx V6

Bob Lunsford
 

For a full reset, I vaguely remember someone, somewhere said it has to be turned off for ten seconds before turning back on. If you tuned it off and immediately turned it back on, maybe the power system did not zero out and the power on reset (POR) did not take place. Could it be?

Bob — KK5R

On Thursday, December 3, 2020, 5:48:43 PM EST, <jon.kd3gz@...> wrote:


Jack
I just went down and turn the radio back ON and it came up as normal, but I turned it OFF and then back ON, and it came back with the blank screen??

Jon/KD3GZ


Re: New PCB available for WA2EBY linear amp #linear-amp

Bob Lunsford
 

Radioddity has a built, ready to plug-n-chug LPF available for their 100W amp that is a fraction of the size of the full kit V6. Costs about $100 if memory serves me correctly. However, if you wanted to concentrate on 40M, for example, one for a single band can be hatched up for a fraction of that price.

Bob — KK5R

On Thursday, December 3, 2020, 3:05:13 PM EST, Mark Hatch <mark2382@...> wrote:


Ken,

Any chance you might make the design files available (or even just the gerbers) for that LPF? Looks pretty nice!

73
Mark
AJ6CU


Re: OT: QCX-mini, 5W CW Transceiver kit launch

Bob Lunsford
 

Nice. I can see carrying one for 40M in my pocket. It might take a bigger pocket for the antenna, though, but for receiving, I can see a telescoping antenna with a small tuner to optimize it for a particular band.

Didn't check to see if it receives across a larger spectrum than a single band and if it can do the zero beat maneuver for an SWLer but that may be too much icing for the cake.

Neat...

Bob — KK5R

On Thursday, December 3, 2020, 2:01:31 PM EST, Hans Summers <hans.summers@...> wrote:


Hi all

Many of you will already be aware of the QCX CW transceiver kit which was launched in August 2017, and evolved into the QCX+ in May 2020. To date, in total 11,568 of these kits have been sold (August 2017 to December 2020). 

I am pleased to announce the QCX-mini: all the same performance, functions, firmware and price of the original QCX/QCX+, but in a much smaller package, a perfect Christmas stocking gift! QCX-mini is now available costing $55 for the kit (same price as the QCX+). A beautifully CNC machined black-anodized extruded aluminium enclosure is available, with laser-etched lettering, for $20. The QCX+ TCXO option is $8.25 and is compatible with QCX-mini. Sturdy and small, it's cute in the shack or perfect for outdoor adventures. 

QCX-mini ordering shop: http://shop.qrp-labs.com/qcxmini
QCX-mini main info page: http://qrp-labs.com/qcxmini

We also will have assembled/tested/aligned/calibrated QCX-mini kits which can be pre-ordered now but probably will take several weeks to assemble since we will be busy handling QCX-mini kit order shipments as much as possible in time for Christmas. The Assembled radio pre-order page is: http://shop.qrp-labs.com/qcxminia

Special portable-friendly features:
  • Small size: 95 x 63 x 25mm enclosure (plus protrusions)
  • Yellow/green LCD module, sunlight viewable, backlight can be switched off
  • Low current consumption (for example 58mA receive current, with 12V supply and display backlight off)
  • Low weight, 202 grams
  • Sturdy extruded aluminium enclosure
  • All-metal BNC short connector, bolted to enclosure
In addition to all the standard QCX/QCX+ features:
  • Easy to build, two-board design, board with main circuit and connectors, display panel board with LCD; all-controls board-mounted on a press-out sub-board. No wiring, all controls and connectors are board-mounted
  • Professional quality double-sided, through-hole plated, silk-screen printed PCBs
  • Choice of single band, 80, 60, 40, 30, 20 or 17m (160m, 15, 12, 10 and 6m are possible with component value changes)
  • Approximately 3-5W CW output (depending on supply voltage)
  • 7-16V recommended supply voltage
  • Class E power amplifier, transistors run cool
  • 7-element Low Pass Filter ensures regulatory compliance
  • CW envelope shaping to remove key clicks
  • High performance receiver with at least 50dB of unwanted sideband cancellation
  • 200Hz CW filter with no ringing
  • Si5351A Synthesized VFO with rotary encoder tuning
  • Iambic keyer or straight key option included in the firmware
  • Simple Digital Signal Processing assisted CW decoder, displayed real-time on-screen
  • On-screen S-meter
  • On-screen real time clock (not battery backed up)
  • Full or semi QSK operation using fast solid-state transmit/receive switching
  • Frequency presets, VFO A/B Split operation, RIT, configurable CW Offset
  • Configurable sidetone frequency and volume
  • Connectors: 2.1mm power barrel connector, 3.5mm keyer jack, 3.5mm stereo earphone jack, 3.5mm stereo jack for PTT, 3.5mm stereo jack for CAT control,  BNC RF output
  • Built-in test signal generator and alignment tools to complete simple set-up adjustments
  • Built-in test equipment: voltmeter, RF power meter, frequency counter, signal generator
  • Beacon mode, supporting automatic CW, FSKCW or WSPR operation
  • GPS interface for reference frequency calibration and time-keeping (for WSPR beacon)
  • CAT control interface
  • Optional 50W PA kit
A small daughtercard PCB has been included to facilitate easy modification to the uSDX software-defined SSB transceiver see https://groups.io/g/ucx (this modification is supported by the uSDX group, not QRP Labs). 

73 Hans G0UPL
http://qrp-labs.com


Re: How do I changing finals voltage? #ubitxv6 #v6 #power

Bob Lunsford
 

Rafael, if you did this, I an imagine that you must be must more cautious to make sure the antenna, etc., is very close to optimum SWR-wise lest you risk popping the finals. If you did finesse the antenna/PA load, then it may be worth trying but for me, I'd prefer a follow-up amp that may run about 50W (they are advertised on the Internet) and not risk the V6 going into PA Failure Mode. However, you also have to make sure the add-on amp has adequate Low Pass Filter protection to make make sure all that power is on the desired frequency.

I understand that if you try to raise the voltage on the PA transistors, you have to break into the V6 landmap traces on the board since they are "hardwired" and not merely using an easily wiring change as on previous versions.

Also, the PA drive levels may need to be adjusted to meet requirements on any follow-up amp. I do not see continually going into the V6 to adjust drive levels for an amp and the to return the drive level to the requirements of the V6. It's like having to continuously pop the lid on a transceiver to plug in a required Low Pass Filter depending on the band you are using. Sure, it can be done but something like this is a grind that detracts from the easy and enjoyable operation of what is actually a simple, easy to use radio. However, sometimes I have to remind myself that everyone's taste is in his own mouth.

Bob — KK5R

On Thursday, December 3, 2020, 12:18:13 PM EST, rafaelgcpp@... <rafaelgcpp@...> wrote:


Hello,

I just finished my uBitx v6 and it is a really great radio. 

I see a lot of people talking about using 20V or 24V to power the finals, but I would like to understand what and where the changes are made. 

I am actually just curious, as I intend to use an external linear PA to increase the output...

Thanks

Rafael


Re: uBITX 6 CW1 and CW2

Bob Lunsford
 

RE: "I was able to construct a filter that is variable from 3.1kc to 170hz using this technique."

I can imagine a switchable filter merely by changing the voltage via a multiposition switch with trimmers to set the filter for different voltages/bandwidths OR a completely variable frequency filter as shown. Neat. and if there is ringing, merely reversing the pot would put it back into the good area. Well worth playing with. If an easily workable scheme were found, it would be worth adding to almost any filter with safeguards to make sure it did not creep into the oscillation range.

Thanks for this, MRM. Things like this make this forum shine, in my opinion.

Bob — KK5R

On Thursday, December 3, 2020, 11:16:43 AM EST, MadRadioModder <madradiomodder@...> wrote:


Without writing a Ph.D. Thesis on this issue and regurgitating the same, there is a very good article on building crystal filters here:  9megxfils.pdf (w7zoi.net) .  He shows you how to match crystals with a home- built device to get the right symmetrical filter response.  He also discusses crystal loading (padding) to shape the bandwidth.  You can imagine this same discussion with a set of varactors instead of capacitors that are REVERSE biased over the appropriate range to supply a capacitance in order to shape the filter.  That is discussed in the papers in this article:  Variable bandwidth crystal filter – uBitx  (where you should ALWAYS look first for these topics). 

 

I used 1SV149 diodes to replace all of the loading caps (shown below).  With a voltage range of 0-9 volts, you can generate a capacitance range of about 400 to 20 pf (over the same voltage range).  You want to match the diodes so that each filter pole is relatively the same (simple… just match the numbers on the packs as they are presorted).  This is not perfect… you can create ringing if you go too far with padding.  The center frequency also drops a bit with heavy padding but that is not a problem (can be taken care of with a slight adjustment to the mixing frequency if necessary… usually not needed).

 

 

I was able to construct a filter that is variable from 3.1kc to 170hz using this technique.

 

ENJOY!

 

From: BITX20@groups.io <BITX20@groups.io> On Behalf Of Jerry Gaffke via groups.io
Sent: Wednesday, December 2, 2020 12:38 PM
To: BITX20@groups.io
Subject: Re: [BITX20] uBITX 6 CW1 and CW2

 

Mad,

Here's the only forum post from you on the topic of the Jones/TenTec/Elecraft style variable crystal filter that I could find:
    https://groups.io/g/BITX20/topic/76150506#81249
Would be good if you could describe what you did.
Something more than "in this group a little over a year ago"

Here's another discussion on the subject:
   https://groups.io/g/BITX20/topic/crystal_cw_filter_with/23176080

Jerry, KE7ER


On Wed, Dec 2, 2020 at 06:11 AM, MadRadioModder wrote:

built a very nice variable CW filter to go in there from crystals and varactors (put in series with the caps to ground; check out the schematic for the Elecraft K2).  There was some work on this published in this group a little over a year ago. The trick is to build a little test set-up for determining which crystals to use in the filter so that you can keep the passband tight.  This was discussed in the group too.


Virus-free. www.avg.com

--

…_. _._


ubitx 6.1 original firmware

m michael z <bb1300@...>
 

I have a ubitx 6.1 that I was attempting to correct then lagging first CW character, and use a straight key with. I followed KD8CEC directions, and can get as far as x loader. The com port is correct, as the radio is recognized, and I can upload a hex file and after it stops at 16104 bytes. After disconnecting the usb cable I have a blank screen when powered up.
I've tried several iterations of connecting with no power applied, with powered applied first or after connecting, power on after upload then disconnect, disconnect then power up. The sequence is not very clear in any of the instructions. Nothing but blank screen.
I have found several files that hint they are the one I need, but none of them produce results.
Where can I find a usable file that says it's v 6.1? Or, are they all the same?
The only one that will repeatably upload is ubitx_20x_org\ubitx. Others I have downloaded produce download failed messages.
Thank you for any info
Mike N3PM
.


Re: v3 calibration? Completed my v6.1

Evan Hand
 

Frank,
A corrupted file would not give these symptoms. The two possibilities are:
1 - That the balanced modulator/product detector has an issue
2 - The SSB filter has a problem.

Neither are addressable by software.

As promised, here is the link to 2 different software options for your v3 board:
The v4 software from HFSignals:
https://github.com/afarhan/ubitx4

A better offering in my opinion is that from KD8CEC:
https://github.com/phdlee/ubitx/releases/tag/v1.20

The package from HFSignals requires the Arduino IDE to compile and load the sketch.  The software from KD8CEC can be loaded using Xloader from the hex files.  If you go to the source files you will need to set the #define statements to match your hardware (version 4 and the 1602 parallel display).  I would go with the KD8CEC software using Xloader loading the UBITX_CEC_V1.200_16P.hex from the UBITXV234 folder in the zip download.  To me, the KD8CEC software is a better build for any of the v5 or earlier boards.  At v6 I would look at the software from Reed N.  That fixes some of the issues with the keyer, screen updates, and the CW operation.

I would also look into the Nextion screen options for all of the uBITX versions.  To me, that option with the KD8CEC software is the best optimization of the uBITX for those not into heavy software modes on their own.  If you are a hacker of software, then maybe an upgrade to the Nano on the Raduino board like the TSW Teensy upgrade, or the JackAl upgrade.

The above are my opinions and observations.  Others can and will have different views.  That is expected, and any correction in information welcome.  I am always looking to learn.
73
Evan
AC9TU


Re: uBitx V6

Jon
 

Gary
I believe you are right, but will wait and see tomorrow when I hope to get back and play with it.

Jon/KD3GZ


Re: uBitx V6

Gary Anderson
 

You will need to leave it off long enough to discharge capacitors.
I don't have a V6, but this is standard practice on using a power cycle as a reset.


Re: uBitx V6

Jon
 

Jack
I just went down and turn the radio back ON and it came up as normal, but I turned it OFF and then back ON, and it came back with the blank screen??

Jon/KD3GZ


Re: uBitx V6

Jon
 

No USB cable plug in...............I am wondering if I lost the firmware? I have idea what went wrong with it.


Re: uBitx V6

Gary Anderson
 

Did you have a USB cable plugged in to the Nano, so you actually didn't power off the Nano to reset it?


Re: uBitx V6

Jack, W8TEE
 

One of the LCD I/O lines is used to read the LCD display, and it is normally not used. I'm wondering if that line is being pulled high somehow and that generates a message? I don't have the uBITX source handy, but I would try using "NO SCREEN READING" in the IDE on the source code to see if the code generates that message. If so, that should be a clue as to the problem.

Jack, W8TEE

On Thursday, December 3, 2020, 4:20:24 PM EST, <jon.kd3gz@...> wrote:


I have another problem?
I was setting up the radio frequency and did it, then I got out of the setting menu and turn radio off and back on, and NO SCREEN READING, it went blank (white)?
Any idea's??

Jon

--
Jack, W8TEE


uBitx V6

Jon
 

I have another problem?
I was setting up the radio frequency and did it, then I got out of the setting menu and turn radio off and back on, and NO SCREEN READING, it went blank (white)?
Any idea's??

Jon


Re: kit-projects AGC with uBITX v5 - need help #v5

Rob French (KC4UPR)
 

Whoops, didn't finish that thought.  So, my switches appear to be wired up right.  In AGC Off, everything works fine.  In AGC Fast/Slow, I get very little ADC, and no AGC action. 

You mentioned the buffer transistor, the MMBT3904. Any good way to check that?  And if I did need to replace it, would a BFR106 be suitable?  (I have a couple of those from when I did the power output modifications.

Regards,
-Rob KC4UPR


Re: kit-projects AGC with uBITX v5 - need help #v5

Rob French (KC4UPR)
 

So, I actually rewired this with a pair of SPST toggle switches I had lying around (one for ON/OFF, one for FAST/SLOW).  In retrospect, I don't think I had a switch problem in the first place.  I still see no apparent AGC action, and the S-meter AGC value is near-zero all the time.

When I disconnect the Common line from the board, and measure between the Common line and ground (with everything else connected) while cycling through the switch positions, I get what is expected:

OFF - 0 ohms
FAST - ~470k
SLOW - ~1M

However, when I reconnect Common to the board, and measure the same resistances, then everything basically measures as a short through the switch.  So clearly there is a path to ground somewhere, regardless of switch position, and I figured I would check out the diodes.  I measured both forward and reverse across both diodes; in both cases I get about 550 mV forward and 1100 mV reverse.  At first I thought maybe this was an issue with the diodes, but looking at the schematic, it seems like there is probably always a return path via Q3 gate-source and the other diode. (Looks like the 2N7002's have about ~690-720 mV drop from gate-source?)

So I'm thinking a DC resistance measurement across the switch positions in-circuit doesn't really work due to the presence of Q3?  (I.e. I'm really just measuring some gate-source resistance)

Any other thoughts? 


So, still stumped.  My switches are wired up right.


Re: New PCB available for WA2EBY linear amp #linear-amp

Mark Hatch
 

Ken,

Any chance you might make the design files available (or even just the gerbers) for that LPF? Looks pretty nice!

73
Mark
AJ6CU


Re: How do I changing finals voltage? #ubitxv6 #v6 #power

Evan Hand
 

Be careful. The v6 has the “brown and red” pins jumpered somewhere on the board. You need to break that connection and then you can run separate power supplies.  I do not have a v6 so cannot say where the connection is on the board  


73
Evan
AC9TU


OT: QCX-mini, 5W CW Transceiver kit launch

Hans Summers
 

Hi all

Many of you will already be aware of the QCX CW transceiver kit which was launched in August 2017, and evolved into the QCX+ in May 2020. To date, in total 11,568 of these kits have been sold (August 2017 to December 2020). 

I am pleased to announce the QCX-mini: all the same performance, functions, firmware and price of the original QCX/QCX+, but in a much smaller package, a perfect Christmas stocking gift! QCX-mini is now available costing $55 for the kit (same price as the QCX+). A beautifully CNC machined black-anodized extruded aluminium enclosure is available, with laser-etched lettering, for $20. The QCX+ TCXO option is $8.25 and is compatible with QCX-mini. Sturdy and small, it's cute in the shack or perfect for outdoor adventures. 

QCX-mini ordering shop: http://shop.qrp-labs.com/qcxmini
QCX-mini main info page: http://qrp-labs.com/qcxmini

We also will have assembled/tested/aligned/calibrated QCX-mini kits which can be pre-ordered now but probably will take several weeks to assemble since we will be busy handling QCX-mini kit order shipments as much as possible in time for Christmas. The Assembled radio pre-order page is: http://shop.qrp-labs.com/qcxminia

Special portable-friendly features:
  • Small size: 95 x 63 x 25mm enclosure (plus protrusions)
  • Yellow/green LCD module, sunlight viewable, backlight can be switched off
  • Low current consumption (for example 58mA receive current, with 12V supply and display backlight off)
  • Low weight, 202 grams
  • Sturdy extruded aluminium enclosure
  • All-metal BNC short connector, bolted to enclosure
In addition to all the standard QCX/QCX+ features:
  • Easy to build, two-board design, board with main circuit and connectors, display panel board with LCD; all-controls board-mounted on a press-out sub-board. No wiring, all controls and connectors are board-mounted
  • Professional quality double-sided, through-hole plated, silk-screen printed PCBs
  • Choice of single band, 80, 60, 40, 30, 20 or 17m (160m, 15, 12, 10 and 6m are possible with component value changes)
  • Approximately 3-5W CW output (depending on supply voltage)
  • 7-16V recommended supply voltage
  • Class E power amplifier, transistors run cool
  • 7-element Low Pass Filter ensures regulatory compliance
  • CW envelope shaping to remove key clicks
  • High performance receiver with at least 50dB of unwanted sideband cancellation
  • 200Hz CW filter with no ringing
  • Si5351A Synthesized VFO with rotary encoder tuning
  • Iambic keyer or straight key option included in the firmware
  • Simple Digital Signal Processing assisted CW decoder, displayed real-time on-screen
  • On-screen S-meter
  • On-screen real time clock (not battery backed up)
  • Full or semi QSK operation using fast solid-state transmit/receive switching
  • Frequency presets, VFO A/B Split operation, RIT, configurable CW Offset
  • Configurable sidetone frequency and volume
  • Connectors: 2.1mm power barrel connector, 3.5mm keyer jack, 3.5mm stereo earphone jack, 3.5mm stereo jack for PTT, 3.5mm stereo jack for CAT control,  BNC RF output
  • Built-in test signal generator and alignment tools to complete simple set-up adjustments
  • Built-in test equipment: voltmeter, RF power meter, frequency counter, signal generator
  • Beacon mode, supporting automatic CW, FSKCW or WSPR operation
  • GPS interface for reference frequency calibration and time-keeping (for WSPR beacon)
  • CAT control interface
  • Optional 50W PA kit
A small daughtercard PCB has been included to facilitate easy modification to the uSDX software-defined SSB transceiver see https://groups.io/g/ucx (this modification is supported by the uSDX group, not QRP Labs). 

73 Hans G0UPL
http://qrp-labs.com


Re: How do I changing finals voltage? #ubitxv6 #v6 #power

SIMON ROSS <simonr5@...>
 

Increasing the voltage on the brown wire will increase output but make sure the plug is out and only use the red for supplying the main board. Using 24v on the finals will boost output but be wary of the excess heat. You may need to use bigger heat sinks but they must be completely isolate. If you are using linearly you may have to reduce output to 5w using rv1 


On 3 Dec 2020, at 18:47, SIMON ROSS via groups.io <simonr5@...> wrote:

I find the power pins in the board. There are 3. Red back and brown. I’m sure brown is the external supply for finals. The red is for the board. 


On 3 Dec 2020, at 17:18, rafaelgcpp@... wrote:

Hello,

I just finished my uBitx v6 and it is a really great radio. 

I see a lot of people talking about using 20V or 24V to power the finals, but I would like to understand what and where the changes are made. 

I am actually just curious, as I intend to use an external linear PA to increase the output...

Thanks

Rafael

6761 - 6780 of 90041