Date   
Miswired USB, need help fixing display #ubitx #radiuno

Andrew Kasurak
 

Ok, so I tried to wire an extra USB port for easy access and managed to hook up USB +5/GND to the usb data lines. OOps. Backlight came on the screen, I unplugged it.

The system is not dead though. My problem is that the display (16x2 lcd) shows one row of solid squares. I tried swapping to a different LCD, same problem. Radio still receives, and I can use the CAT control (CEC firmware, ubitx r3).

I'm not sure what I need to replace to get the screen working again, seeing as everything seems to be working. Can anyone suggest tests or faults that might help me narrow down or fix the problem? I have a ds1054z.

Thanks,
Andrew Kasurak, VA2QCH

IF OUT uBitx sensitivity loss

iz oos
 

I tapped the IF before the 12Mhz IF between R37 and C31. The braid of the short coax was taken at R36. I used a block cap (3000pf) between the R37 and the buffer amp. The buffer amp was between the uBitx, attenuators and the softrock ensemble receiver. The estimated sensitivity loss is around 15-20db. I replaced the TDA2222 without any change. What might have been happened? TX output is fine.

Re: uBitx Software Update

Bo Barry <bobarr@...>
 

The USB cable on the ubitx only control the frequency and transmit PTT.  The two crisscrossed audio cables do the communication.

On modern rigs like my Icom7300  the USB cable does it all.
Enjoy the digital modes while our sun refuses to give us many spots.  I'm hoping to live until the next peak

Bo W4GHV since '54

Re: PTT Breakout

_Dave_ K0MBT
 

You might want to put an electret microphone  in the box and put a more robust ptt switch on it.

I made a table mic from an old gooseneck light and added a dpdt switch on the front panel of the unit so I can switch both the mic and speaker to go to my computer for digital.

µBITX v3 : TX OK but no audio on RX

F5PCX
 

Hi everyone,
Here is the problem :
- No audio is coming out, no side tone can be heard when keying the transceiver. (headphones or speaker)
- If I press the PTT, whistling strongly in the mike, the power out is OK (10 W on 40 m)
- The same on CW : 10 W out but no side tone.
I would add that we receive here is very strong RTTY station on 10.100 MHz.. I can sometimes hear it in my headphones, but the signal is very very weak, it can hardly been heard.

I suspected U1 (a NJM 2073) and I replaced it by another one and even later by an original TDA 2822... It was exactly the same situation.
When I pull the PTT or key the TX, I can hear the relays clicking.
I'm a very bad technician...  Can someone give me an advice ?

Sorry for my english...
73 - Jean, F5PCX. 

Re: uBitx has a bit too crispy / semi-distorted audio even on low signal levels #ubitx #ubitx-help

 

OK you solved the "crispy" distortion as I suggested. 47 Ohms preset or 100 Ohms should do.

I suspect you have not done a BFO calibrate. Change the default to 11.996500 and see if that helps you.

Raj

P.S. If you are replying my mail, please edit the trailing mail and leave only the relevant bits. Just like below

At 05-10-18, you wrote:
Well ...“crispy” problem was solved by adding 470 preset between D14 and D15 .. this is now not the issue .. but .. If I take my backup receiver JUMA RX1 I build years ago as reference (powered on external battery without antenna), it has very nice noise (buzz) without any others interference noise hearing in background (sorry but English is not my mother language so hopefully it will be understandable what I mean). If I power on my uBitx (V4) it is in background something like high frequency noise .. like light whistling … silent, but still audible whistling. Can be that this „ whistling” is coming form any arduino operations ? or … ?

Martin, OK5MCA

Re: uBitx has a bit too crispy / semi-distorted audio even on low signal levels #ubitx #ubitx-help

capo358@...
 

 Ron... please tell me it is solvable ...

Martin, OK5MCA

Re: uBitx Software Update

YO8UFO
 

Okay, that's gold! Thanks for the information! 

Re: BITX QSO Afternoon/Evening, Sunday, August 26, 3PM & 7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere.

Jay - WS4JM
 

Is this still an ongoing event? I've been out of pocket for a while but will i will be on 7.277 around 7:00 CDT (0:00 utc) October 7. Hope to catch a few of you Sunday night.

73 de Wasabi Sushi 4 Japanese Meals
Jay

Re: uBitx Software Update

Bill Cromwell
 

Using LSB with a 700 Hz tone gives a carrier of 6999300 Hz

On 10/05/2018 03:12 PM, Jerry Gaffke via Groups.Io wrote:
Correction: You would have to be in USB mode (not LSB mode)
for the 700 hz tone to create a signal at 7000700 hz.

On Fri, Oct 5, 2018 at 12:10 PM, Jerry Gaffke wrote:

f you tune the radio to transmit in LSB phone mode with a suppressed
carrier at 7000000 hz,
then transmit a pure 700 hz audio tone into the mike, the resulting
transmission will be a carrier at 7000700 hz.

_._,_._,_
--
bark less - wag more

Re: uBitx Software Update

Jerry Gaffke
 

Correction:  You would have to be in USB mode (not LSB mode)
for the 700 hz tone to create a signal at 7000700 hz.


On Fri, Oct 5, 2018 at 12:10 PM, Jerry Gaffke wrote:
f you tune the radio to transmit in LSB phone mode with a suppressed carrier at 7000000 hz,
then transmit a pure 700 hz audio tone into the mike, the resulting transmission will be a carrier at 7000700 hz.

Re: uBitx Software Update

Jerry Gaffke
 

If you tune the radio to transmit in LSB phone mode with a suppressed carrier at 7000000 hz,
then transmit a pure 700 hz audio tone into the mike,
the resulting transmission will be a carrier at 7000700 hz.
Assuming the tone and the SSB transmitter are perfect.
Since the carrier and the opposite sideband are not fully suppressed, there will also be signals
at 7000000 hz and 6999300 hz.  And since the audio tone and the microphone and the
transmitter gain circuits are not perfect, there will be stuff going out over the air due to 
harmonics of the 700 hz audio tone.
But there have been SSB transmitters built successfully that transmit CW signals
using this method.

On the uBitx, CW transmissions occur much differently than SSB transmissions.
On CW, the mike amp, modulator, 12mhz filter, second mixer, and two IF amps are not used.
Instead, to transmit on 7000000 hz, a signal at 7000000 hz on CLK2 from the Si5351
is injected into the first mixer.  No mixing occurs, as there is no signal coming in from the
45mhz IF.   That 7000000 hz signal goes on through the power amp and out the antenna.
Much much simpler, and the signal can be cleaner.  No spurious signals (such as a
suppressed carrier or opposite sideband), no issues with harmonics of the 700 hz audio.
No issue with IMD in the power amp since there is only one signal going through and
nothing else to intermodulate with.

Jerry, KE7ER


On Fri, Oct 5, 2018 at 10:47 AM, Daniel wrote:
But let's assume that when you press the CW keyer on uBitx you send a signal of 700 Hz . If you press the PTT button and inject a sound signal of 700 Hz through the microphone wires, the transceiver is acting in the same way as keying? The path of the signal will be the same? Or there is some disadvantages of doing CW through SSB mic line? I hope that I can be understood what I mean, my English is a little rusted. 

ubitx s-meter problem

Reparatii Electronice Sofian Adrian
 

Hello everybody, i have a ubitx with CEC firmware ver 1.08 from Ian Lee with 2 line display. i have a problem with the s-meter on RX is working fine but i want to use the same bargraph when i switch on TX to measure the swr. When the transceiver goes on TX the lines on the bargraph stays still on the last position where it was on rx and nothing changes. I have been looking over the source code but no luck to find something. I have to unlock the meter on tx mode . Any help will be apreciated. I have attached the files above if someone could help me.Thanks in advance

Re: uBitx Software Update

YO8UFO
 

But let's assume that when you press the CW keyer on uBitx you send a signal of 700 Hz . If you press the PTT button and inject a sound signal of 700 Hz through the microphone wires, the transceiver is acting in the same way as keying? The path of the signal will be the same? Or there is some disadvantages of doing CW through SSB mic line? I hope that I can be understood what I mean, my English is a little rusted. 

Re: uBitx has a bit too crispy / semi-distorted audio even on low signal levels #ubitx #ubitx-help

Dr. Flywheel
 

Martin, I noticed the same background noise and very likely it is a result of signals coming from the nearby digital circuitry. The frequency is around 200-300 Hz.

--Ron   N7FTZ 

On Fri, Oct 5, 2018 at 5:58 AM <capo358@...> wrote:
Well ...“crispy” problem  was solved by adding 470 preset between D14 and D15 .. this is now not the issue .. but .. If I take my backup receiver JUMA RX1 I build years ago  as reference (powered on external battery without antenna), it has very nice noise (buzz) without any others interference noise hearing in background  (sorry but English is not my mother language so hopefully it will be understandable what I mean). If I power on my uBitx (V4) it is in background  something like high frequency noise .. like  light whistling … silent, but still audible whistling.  Can be that this „ whistling” is coming form any arduino  operations ? or … ?

Martin, OK5MCA

Re: Adding /modifying firmware. #firmware

KM4TRT
 

Thanks N5KBP and Mike,
Memory manager working well.  On now to stand alone analyzer
I bought some extra arduinos for that purpose.

Andy KM4TRT

Re: PTT Breakout

Skip Davis
 

Nice work Ethan, I made a similar one for my KX3 to be able to use different mics and headphone combinations. Also jacks added for digital mods, a great project there Ethan.

Skip Davis, NC9O 

On Oct 5, 2018, at 00:32, cathos <pathos13@...> wrote:

I didn't like the Push To Talk options I had seen, and I wanted something that would work with the provided mic or other standard QRP microphones. Here is my solution, with a bypass in parallel with the other switches if the mic I am using has a built-in switch. This should work with standard 1/4 inch jack foot switches, also.
<IMG_20181004_201608.jpg>
<IMG_20181004_200313.jpg>

Ethan Moore 
K0ITX 

Re: uBitx Software Update

Tom, wb6b
 

You could turn down RV1. That would reduce the TX output for SSB as well.

If you don't use CW you might experiment with raising the value of R104 that provides a DC current to unbalance the mixer, causing the uBITX to produce a carrier for CW. I have not tried this, so if anyone has tried it, it would be good to know how well it worked. 

Tom, wb6b

Re: uBitx has a bit too crispy / semi-distorted audio even on low signal levels #ubitx #ubitx-help

capo358@...
 

Well ...“crispy” problem  was solved by adding 470 preset between D14 and D15 .. this is now not the issue .. but .. If I take my backup receiver JUMA RX1 I build years ago  as reference (powered on external battery without antenna), it has very nice noise (buzz) without any others interference noise hearing in background  (sorry but English is not my mother language so hopefully it will be understandable what I mean). If I power on my uBitx (V4) it is in background  something like high frequency noise .. like  light whistling … silent, but still audible whistling.  Can be that this „ whistling” is coming form any arduino  operations ? or … ?

Martin, OK5MCA

Re: uBitx Software Update

Curt M.
 

Thanks Tom.  Can the output of the built in WSPR mode be turned down to some mW value?  I would think that if this can be done that the heat sinks shouldn't get very warm or am I missing something?