Date   
Re: New to BITX,simple questions

Evan Hand
 

The QCX is a CW (Morse Code) only single band transceiver.  There is one available for the CW segments that a Technician class can operate, just no SSB/Phone.  
http://shop.qrp-labs.com/qcx

Look up  ARRL Band Plan on the internet.  That will show you the segments that a technician class can operate on legally.

Here is a link to a specific page on Technician privileges (note, you may need to be a member to view it.  No way for me to check as I am a member):
http://www.arrl.org/files/file/Tech%20Band%20Chart/Tech%20Band%20Chart.pdf

73
Evan
AC9TU

Re: Only noise when connected to the antenna #v6

Evan Hand
 

Jonathan,

Are you sure the windings of the transformer are the correct polarity?  If you had one of the balanced mixer side of the transformer maybe not mixing properly.  You might also want to check the mixer diodes.

The above is assuming (as I had read in prior emails) that you have traced the signal all the way up to the BFO product detector stage.

Just ideas
73
Evan
AC9TU.

Re: #v6 software #v6

Juha Lindfors
 

Hi David,

Look for Reed's code in Github. I'm answering with phone now but can look at the link after a while.

Juha oh8cw

su 1. maaliskuuta 2020 klo 8.05 David R. Hassall WA5DJJ <dhassall@...> kirjoitti:

Dear Members,

 

I am getting back in the game with a new all band Ubitx v6.   In preparation of trying to put a NX display on it, I was learning how to download and program a Arduino NANO and see if it would work.   I bought some identical (I think) Arduinos from Amazon and after giving them an Alcohol bath to make sure they didn’t have the Corona virus on them.  I soldered the pin on the to match the existing Nano in the Ubitx.   The downloading and setting up the Arduino IDE went well thanks to Farhan’s Video.  In the tools my NANO’S would only program somewhat correctly when I used the ATMEGA 328P (old bootloader) option.  The other thing is that my programmed NANO’s would not allow me to select anything on the touch screen.

I did a visual scan of the chips, pin numbers, and resistors and the boards look to be identical.  Just as a check, I assembled a second board and programmed it and got the exact same results.   I am using Arduino version 1.8.12 IDE.  So, I am at a

Crossroads on what to do next.   I tried to find another version of the software and saw messages that said version 6.3.1 but it wasn’t on the Git Hub location that I could find. 

 

So my questions are:

Am I the only one that noticed this “feature”? 

Is there another working version of the V6 software somewhere that I can download and try again?

Is the software on the Git Hub site been checked lately.

Is there some other troubleshooting I can do?

 

I am glad I  kept my original Arduino intact with version 6.1 software on it and use other processors  to learn with. 

 

Any suggestions welcome.  I really like the sound of the radio.  It will be an asset to my learning and showing others that things like this are possible with perserverence and learning new skills.

 

Take care and have fun.

73 Dave Hassall WA5DJJ  Las Cruces, New Mexico

Website: http://www.zianet.com/dhassall/

QRSS SUPER GRABBER WEBSITE: http://www.qsl.net/wa5djj/

 

Re: New to BITX,simple questions

Peter LB0K
 

Regarding the QCX trcvr.
It isn't meant to work on 10m, or 12m or 15m. 

Am I right in suggesting it won't be much use for a USA tech license?

#v6 software #v6

David R. Hassall WA5DJJ
 

Dear Members,

 

I am getting back in the game with a new all band Ubitx v6.   In preparation of trying to put a NX display on it, I was learning how to download and program a Arduino NANO and see if it would work.   I bought some identical (I think) Arduinos from Amazon and after giving them an Alcohol bath to make sure they didn’t have the Corona virus on them.  I soldered the pin on the to match the existing Nano in the Ubitx.   The downloading and setting up the Arduino IDE went well thanks to Farhan’s Video.  In the tools my NANO’S would only program somewhat correctly when I used the ATMEGA 328P (old bootloader) option.  The other thing is that my programmed NANO’s would not allow me to select anything on the touch screen.

I did a visual scan of the chips, pin numbers, and resistors and the boards look to be identical.  Just as a check, I assembled a second board and programmed it and got the exact same results.   I am using Arduino version 1.8.12 IDE.  So, I am at a

Crossroads on what to do next.   I tried to find another version of the software and saw messages that said version 6.3.1 but it wasn’t on the Git Hub location that I could find. 

 

So my questions are:

Am I the only one that noticed this “feature”? 

Is there another working version of the V6 software somewhere that I can download and try again?

Is the software on the Git Hub site been checked lately.

Is there some other troubleshooting I can do?

 

I am glad I  kept my original Arduino intact with version 6.1 software on it and use other processors  to learn with. 

 

Any suggestions welcome.  I really like the sound of the radio.  It will be an asset to my learning and showing others that things like this are possible with perserverence and learning new skills.

 

Take care and have fun.

73 Dave Hassall WA5DJJ  Las Cruces, New Mexico

Website: http://www.zianet.com/dhassall/

QRSS SUPER GRABBER WEBSITE: http://www.qsl.net/wa5djj/

 

Re: Tuning knob

Gigabyte
 

I'm happy to report it was the encoder.  I purchased this I linked from eBay and replaced it and it's working beautifully.  Now on to getting everything tuned up.  😃

Re: Setup mode #v6

barry halterman
 

Power off radio, press the button in, then power up...


On Sat, Feb 29, 2020, 9:34 PM <ja8jdq@...> wrote:
I can't enter setup mode even if I try below.  firmware V6.31
 why?
  1. Power off radio
  2. Power on radio
  3. Press and hold tuning button for 10 seconds (or until menu comes up)

Re: Setup mode #v6

sam
 

I can't enter setup mode even if I try below.  firmware V6.31
 why?
  1. Power off radio
  2. Power on radio
  3. Press and hold tuning button for 10 seconds (or until menu comes up)

Re: Only noise when connected to the antenna #v6

Curt
 

Jonathan

Nice work getting used to a nice spectrum analyzer. And doing some calculations. Keep in mind the bandwidth at the receive output is about 3 kHz.

I suggest starting near the back of receiver and going forward. Turn the volume all the way down, place a signal within the IF of the 11ish MHz xtal filter, both before and after. BTW if you have a leftover xtal, easy to make a generator that outputs approx s9 and s3 signal levels, I homebrewed one from norcal qrp website. Or use whatever signal generator thats there, but highly attenuated. if that seems good, work your way toward front. Not a bad idea to check voltage bias of each Rx path amplifier.

Solder connections can look good and be bad.

Thinking ahead, for transmit you should find or make a dummy load. 4 2 watt 200 ohm resistors in parallel etc.

All those mixers have transformers, always possible the insulation isn't off a wire. When you check continuity, never touch wire but a connected pad is better than edge of solder.

I presume you checked frequency of each oscillator and its presence.

curt

Re: Only noise when connected to the antenna #v6

Jonathan Kayne, KM4CFT
 

Here is a capture of the (de)modulator from the spectrum analyzer. I Injected a 14 MHz sine at -60 dBm. On the uBitx v6 schematic this would be at TP20.
Again, turning on or off the function generator seems to not affect anything shown here and I suspect this is crossover from the other mixers and LO.

Re: Only noise when connected to the antenna #v6

Jonathan Kayne, KM4CFT
 

Okay, so I went through and recorded the gains and losses of each section. I did this because my RF mentor said that I should be able to easily hear a -90 dBm signal. Unfortunately this was a bit of an issue as the noise floor of the spectrum analyzer was above that.
Regardless, here is what I found going from antenna to audio:
LPF + 1st conversion: -9 dBm
Preamp 1: +18 dBm
2nd conversion: -8 dBm
BPF: -8 dBm
Preamp 2: +20 dBm
SSB filter: -8 dBm
final conversion: unknown

The (de)modulator stage does not seem to have a specified conversion loss so I am not sure what to do about that. Looking at the signal (with an oscilloscope) out of this looks like a noisy mess even without any incoming RF signal with tons of harmonics. I have attached a scope capture:

Turning on and off the function generator does not seem to affect this wave.

Something I have been considering is adding on another amplification stage between the LPF and the 1st conversion to bring the incoming signal from -90 dBm to -60 dBm because I suspect the signal would be falling below the noise floor.

Re: No RX LED indication #v5

Rick Green
 

On Sat, 29 Feb 2020, Brad, K7NNR wrote:

So I have double checked my connections and I have verified that if I switch the LED connector the LED will change from red to green when i hit the PTT. But I still cannot get it to light up when
in RX. It is not a big deal, but since I know it is supposed to it will drive me nuts until I can figure it out.
Here is a pic of the connections. Did I miss something obvious?
I assume you've checked carefully for solder bridges on those connections. There's very little room, and no dedicated thru-holes for those connections.

Are you open to an off-the-wall suggestion? Check continuity of the RX wire in that harness from the main PCB to the pin connector on the LED board. I pulled my hair out for weeks trying to figure out why my unit had no audio out, until I finally stopped assuming the obvious and discovered a bad crimp on one pin of a similar three-pin pigtail which I had used to wire my volume control. The 'high side' of my volume pot wasn't connected to anything!

--
Rick Green, N8BJX

We, the People of the United States of America, reject the U.S. Supreme Court's
Citizens United ruling, and move to amend our Constitution to firmly establish
that money is not speech, and that human beings, not corporations, are persons
entitled to constitutional rights.

http://www.MoveToAmend.org

Re: Kit_projects AGC V5 Volumne pot install question #v5

KE2GKB
 

Afternoon brad, Yes the connection is to the volume pot on the front of the board. The high side is the end that comes from the radio to the audio chain. So it would be the input to the potentiometer. In a typical installation it is the yellow wire from the AUDIO connector on the bitx main board. So it should be the leg with the yellow wire on the front panel volume control potentiometer

-- Tim Keller - KE2GKB https://shop.kit-projects.com

Re: No RX LED indication #v5

Brad, K7NNR
 

So I have double checked my connections and I have verified that if I switch the LED connector the LED will change from red to green when i hit the PTT. But I still cannot get it to light up when in RX. It is not a big deal, but since I know it is supposed to it will drive me nuts until I can figure it out.

Here is a pic of the connections. Did I miss something obvious?

Kit_projects AGC V5 Volumne pot install question #v5

Brad, K7NNR
 

I recieved my kit-projects AGC kit this week and am working on the install today.  When reading the install instructions there is mention of a volume pot connection. How do it determine what side is the "high" side to connect the wire from "V' to?

Can you also confirm that this is a connection to the actual volume pot on the front panel and not another pot that I need to add?

Re: Triumvirate Skonk Worx (TSW) updated Teensy 4.0 to NANO adapter #ubitx #v6

Jim Sheldon
 

Hi Joel,
Yes they are.  That is all we are selling now.  However if all you want to do is add a Teensy 4.0, the adapter fits the Factory's Raduino just fine.  If you need a replacement or want a spare V6 Raduino, then our Clone kit will fill the bill.  It's electrically identical to the Factory one, we just laid it out slightly different.  If you want to add a Teensy 4.0 to the Raduino Clone then you still need the adapter board.  

I am using one in my V6 (full kit) uBITX with the factory case now and the top cover fits fine with the new board.  

The latest published software for the Teensy 4.0 has a real time clock now and we also reworked the T4-NANO adapter to add the 5 extra Teensy 4 connections, a backup battery connection and we also provide a coin cell backup battery with the kit now.  USPS increased postage rates so with that and the extra parts, the price of the adapter kit went up to $12 postage paid instead of $10.  The Raduino Clone kit is still $35 as before.

Jim





------ Original Message ------
From: "Joel Caulkins/N6ALT" <caulktel@...>
Sent: 2/29/2020 1:22:59 PM
Subject: Re: [BITX20] Triumvirate Skonk Worx (TSW) updated Teensy 4.0 to NANO adapter #ubitx #v6

Jim,

Are the new Raduino replacement boards that fit the V6 cabinets ready yet?

Joel
N6ALT

Re: Triumvirate Skonk Worx (TSW) updated Teensy 4.0 to NANO adapter #ubitx #v6

 

Jim,

Are the new Raduino replacement boards that fit the V6 cabinets ready yet?

Joel
N6ALT

Re: New to BITX,simple questions

Evan Hand
 

The short answer is no, unless the discone you have can work down to 28 MHz, as that is the hugest band  that the ubitx can operate on.

Note:  You do need an amateur radio license for this radio, and to use it on SSB (for a USA licensee) a general class or better is required on all bands below 28 MHz. A technician class could use it on the 10 meter segment that allows SSB, or for the CW Morse code portions of the bands. However, this transceiver is not the best for CW.  There are other rigs that are focused on CW that can be both cheaper and more functional for CW (The QRPLabs QCX series come to mind).

So the steps I would recommend depends on your preference.  all starts with studying for the exame for the type of operation that you want to do.
General for Phone/SSB
Technician for CW and VHF/UHF operation

Then picking a rig based on mode of operation
plan the antenna Including the needed room for an antenna
pass the examine
order the rig and parts/kits for the auxiliary equipment and antenna.
I would include a dummy load as on of the pieces of test gear, as well as a low power SWR/Power meter, and at least a digital multi meter.

The QRPLab sight as well as the QRP kits 
https://qrp-labs.com/
https://www.qrpkits.com/

Hope this helps.
73
Evan
AC9TU

Re: Good spot to insert audio preamp on V6 #v6

Evan Hand
 

I would agree with what you are saying based on the v5 that I have.  I did not need to add the outboard amp as I had plenty of sound from the speaker.  However I still run the volume almost maxed out.

I did need the amp on the v4 boards that I have.  This is why Sunil included it in the kits.

Since I do not have a v6, you will need to work out the best place on your own, or hopefully someone else has done it already.

Before you cut into your rig, you might want to run the calibration again.  If the master crystal is off there may be an impact on the 45 MHz roofing filter.  Just a guess on my part and I have not done the math.  As stated above, my v5 with basically the same audio circuits does not have the volume issue as you have stated.

FWIW
73 and good hunting for the solution.
Evan
AC9TU

Re: V6 Low volume on speaker

 

Russ,

You are finding out what a lot of us are finding, that the volume needs to wide open to hear anything. I am going to install a preamp to the audio section and will report back as to how it works. Another thing I have found is the speaker included with the Full V6 kit is very inefficient and sucks every milliwatt of audio from the LM386. I don't have any that fit the bolt pattern of the one provided in the case, but plugging a different speaker into the front earphone jack yields a lot more audio.

Joel
N6ALT