Date   
Re: Received modulation is good only if IFS is 1400-1810

Dr. Flywheel
 

From the symptoms, it looks like you may need to do the VFO calibration first, followed by the BFO calibration and then setup the IF SHIFT manually to get the proper result. As long as the calibration is off, signals will be attenuated significantly, if the oscillators frequencies effectively fall beyond the center of the filters pass band. Component variation makes the center of the pass band to be off 45 MHz and 12 MHz sometimes by a few kHz. In my case it is 2.5 kHz off.

--Ron     N7FTZ

On Sun, Oct 7, 2018 at 9:51 PM <jaszczur666@...> wrote:

Oh man, my uBitx doesn't sound good, and actually setting IF @ around 1600 fixes that to a degree.

I was thinking I maybe badly wired the power connectors (it goes all the length of the board from rear panel to the switch on front panel) and I was getting to rewire it and put a screen (I was thinking a piece of twine and some kitchen aluminium foil) on them, but maybe that's not it?

What do you mean by modulation that's not good?

On mine uBitx there is a constant noise, somewhat crackling like a meat frying on a pan, that on the spectrum looks like a bump with peak around 2.5 or maybe 3 kHz. I can shift it with IF shift, but never loose it. I tried decoding FT8 and it goes quite well even if under this bump. SSB is hard to understand though, and only putting IF at 1600 makes it somewhat clearer. I can read very strong signals, but weaker are no-go.

Oh and my current stored IF shift is 0, if I read the dump correctly.

Re: UBITX ham bands covered and what enclosure fits the UBITX

Jens Uhlig
 

Hi Al,

the uBitx covers 80-10m.
I got mine enclosure on ebay.
Best is to use a metal one.
Since I have not much possibility to work metal I got me one of plastic and put self adhesive copper foil in.
Seems to work.

Another option is to use copper covered pertinax boards. (Like the one to develop electronic boards) they can be easily cutted and easy soldered together.

Cheers Jens 
DL7JU 

*** mobil ***

Am 08.10.2018 um 02:24 schrieb al2ok <al2@...>:

Does the UBITX cover all ham bands 80-10 ?   What enclosure fits the UBITX ,where do I get the enclosure ?

Thank You,

Al

Re: UBITX ham bands covered and what enclosure fits the UBITX

Jerry Gaffke
 

Sunil has some nice metal enclosures for the uBitx:  https://amateurradiokits.in/store/
Search for "Sunil" at the groups.io webpate for reviews:  https://groups.io/g/BITX20/messages


The uBitx as currently shipped works well enough as an SSB rig from 80 through 17 meters,
though the low pass transmit harmonic filters have been laid out in such a way that they do
allow through more harmonics than they should.
Above 17 meters. there is an issue with additional spurs due to local oscillators into the diode ring mixers
being too weak and the incoming signal to those mixers being too strong.
Less than ideal carrier suppression and intermodulation distortion in the amps also contribute
to a not quite clean signal, though these are lesser sins.

I would recommend adding external low pass filters for 80 through 17 meters for the harmonics,
and avoid use on 15, 12, and 10 meters ssb mode (CW is ok) due to spurs. 
With that, it meets legal requirements in most jurisdictions.

Avoid using an external high powered amp unless you are sure the signal is clean.
High mike audio can overdrive the rig and make spurious emissions worse. 
That said, the stock uBitx can give 10 watts on 80 and 40 meters, falling off to 2 watts or so on 10 meters.
Without mods, the signal on all bands 80-10 meters should create no more spurious emissions
than the typical 100-200 watt commercial transceiver.

Much discussion to be found in this forum with regard to improving harmonics and spurs,
and improving the relatively low power output on the upper bands.

This is a radio well suited for tinkerers, be ready to play with it and learn
as you hack at it to make improvements.

Jerry, KE7ER


On Sun, Oct 7, 2018 at 06:41 PM, Bill Cromwell wrote:
Hi Al,

It does cover the bands 80 through 10 meters. With some small effort (additional filters) it seems to cover 160 meters as well. I am going to try that (160).

There are enclosures being sold from several sources and most of them look pretty good. Most of them are made of plastic and so will need some kind of metal shielding installed inside. Some of us have made our own enclosures. I made mine from new sheet steel. Others have used aluminum or have soldered sheets of blank circuit board material together to make the enclosure. I have used both of those methods for other projects.

The files sections contain photos and the names of manufacturers. There is even more at HFSignals' web site at something like HFSignals.net. Others will surely join.

73,

Bill KU8H
toggle quoted message. . .

 

On 10/07/2018 08:24 PM, al2ok wrote:
Does the UBITX cover all ham bands 80-10 ? What enclosure fits the
UBITX ,where do I get the enclosure ?

Thank You,

Al

Re: Received modulation is good only if IFS is 1400-1810

jaszczur666@...
 

Oh man, my uBitx doesn't sound good, and actually setting IF @ around 1600 fixes that to a degree.

I was thinking I maybe badly wired the power connectors (it goes all the length of the board from rear panel to the switch on front panel) and I was getting to rewire it and put a screen (I was thinking a piece of twine and some kitchen aluminium foil) on them, but maybe that's not it?

What do you mean by modulation that's not good?

On mine uBitx there is a constant noise, somewhat crackling like a meat frying on a pan, that on the spectrum looks like a bump with peak around 2.5 or maybe 3 kHz. I can shift it with IF shift, but never loose it. I tried decoding FT8 and it goes quite well even if under this bump. SSB is hard to understand though, and only putting IF at 1600 makes it somewhat clearer. I can read very strong signals, but weaker are no-go.

Oh and my current stored IF shift is 0, if I read the dump correctly.

Re: UBITX ham bands covered and what enclosure fits the UBITX

Bill Cromwell
 

Hi Al,

It does cover the bands 80 through 10 meters. With some small effort (additional filters) it seems to cover 160 meters as well. I am going to try that (160).

There are enclosures being sold from several sources and most of them look pretty good. Most of them are made of plastic and so will need some kind of metal shielding installed inside. Some of us have made our own enclosures. I made mine from new sheet steel. Others have used aluminum or have soldered sheets of blank circuit board material together to make the enclosure. I have used both of those methods for other projects.

The files sections contain photos and the names of manufacturers. There is even more at HFSignals' web site at something like HFSignals.net. Others will surely join.

73,

Bill KU8H

On 10/07/2018 08:24 PM, al2ok wrote:
Does the UBITX cover all ham bands 80-10 ? What enclosure fits the
UBITX ,where do I get the enclosure ?

Thank You,

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

Re: uBitx Software Update

Jerry Gaffke
 

Ben,

What you say is correct for an AM transmitter. 
But not an SSB transmitter. 

A perfect single sideband transmitter with a pure audio sine wave into the mike jack
will transmit a signal that is indistinguishable from any CW transmitter.

Jerry, KE7ER


On Sat, Oct 6, 2018 at 08:27 PM, Ben Weiss wrote:
No, when you sent CW you are sending a sine wave. When you send USB or LSB or a.m., you are sending a modulated sine wave

--
Ben Weiss
Clearlake, CA
 
toggle quoted message. . .

 

On Oct 5, 2018, at 10:47 AM, Daniel <gonewiththeego@...> 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 ham bands covered and what enclosure fits the UBITX

al2ok
 

Does the UBITX cover all ham bands 80-10 ?   What enclosure fits the UBITX ,where do I get the enclosure ?

Thank You,

Al

Re: echo at #ubitx #filters

Joe Puma
 

I think the 45mhz filter mod can fix this. Maybe someone more knowledgeable here can comment.  

Joe



On Oct 7, 2018, at 7:14 PM, Don - KM4UDX <dontAy155@...> wrote:

Hello good people!  I have a bit of a problem on TX i think..

 I watch myself on a webSDR (http://alex.proxy.kiwisdr.com:8073/) and I see echos of my PSK31.  At first I thought, weird, some is TXing at exactly the same time I am, and there are multipules of me, how weird...but then I figured out it was actually me. yeeks!!  And I did make a QSO...which was very exciting when it happens. But I was told initially that (and I quote)...
KM4UDX de KM4UAG

"Please be aware that you are transmitting echo at 5 additional frequencies and it is quite loud. It may be a problem of antenna. Also, take
a look at software such as Digital Master that helps a lot with all these macros and other bells and whistles for digital modes.BTU"

so I reduced power, and he then said that:

"M4UDX de KM4UAG now it looks more like usual BPSK signal, but echo still exists at +1khz, +2khz and at - at the same
distance. the bad is that the echo is as loud as the main transmission."

Is there anything else I can do?? Thanks for any help!

Don

echo at #ubitx #filters

Don - KM4UDX
 

Hello good people!  I have a bit of a problem on TX i think..

 I watch myself on a webSDR (http://alex.proxy.kiwisdr.com:8073/) and I see echos of my PSK31.  At first I thought, weird, some is TXing at exactly the same time I am, and there are multipules of me, how weird...but then I figured out it was actually me. yeeks!!  And I did make a QSO...which was very exciting when it happens. But I was told initially that (and I quote)...
KM4UDX de KM4UAG

"Please be aware that you are transmitting echo at 5 additional frequencies and it is quite loud. It may be a problem of antenna. Also, take
a look at software such as Digital Master that helps a lot with all these macros and other bells and whistles for digital modes.BTU"

so I reduced power, and he then said that:

"M4UDX de KM4UAG now it looks more like usual BPSK signal, but echo still exists at +1khz, +2khz and at - at the same
distance. the bad is that the echo is as loud as the main transmission."

Is there anything else I can do?? Thanks for any help!

Don

Re: Received modulation is good only if IFS is 1400-1810

Jens Uhlig
 

Me?
No. Not yet.
Jens

*** mobil ***

Am 07.10.2018 um 23:29 schrieb "andrea@..." <andrea@...>:

Did you try to post this issue on CEC site?

Re: Received modulation is good only if IFS is 1400-1810

Jens Uhlig
 

Hej Ron,

Thank you for that hint.
That means that all the OMs (and YLs) using CEC Software have the same Problem?
Strange.
So far I helped me also by adjusting the IFS manually.
Maybe someone has an idea.

73 De DL7JU 
Jens 

*** mobil ***

Am 07.10.2018 um 20:40 schrieb Dr. Flywheel <Dr.Flywheel@...>:

In my case (ubitx V4 with CEC software) I need to set the IF SHIFT value to 2500 in order to get a very nice audio sound. My VFO and BFO are properly calibrated; therefore it is likely that filter component behavior is responsible for the oscillator frequencies hitting to the side of the 45 MHz and 12 MHz filters. There is a way to compensate for this behavior by adjusting the IF_SHIFTVALUE stored in the EEPROM. At this point, I chose to ignore the problem and just set the IF SHIFT manually, since I do not have time to work on my uBitx software right now.

I wonder if people on this list can tell us what is the EEPROM value stored at the IF_SHIFTVALUE location, for their specific uBitx (if they are using the CEC software).

Thanks,

--Ron    N7FTZ

On Sun, Oct 7, 2018 at 10:41 AM Jens Uhlig <uhlig@...> wrote:
Hi Andrea, 

that is exactly my problem too!
I have to switch on IFS and shift it to the right edge. (On my Nexion Display)

Did not found a solution so far.
Setting up the BFO did not cure the Prob.

73 de DL7JU 
Jens 

*** mobil ***

Am 07.10.2018 um 19:25 schrieb "andrea@..." <andrea@...>:

Hi,
is it normal that I can listen correctly only if the IFS value is around 1400-1810 as value?

Re: Received modulation is good only if IFS is 1400-1810

andrea@...
 

Did you try to post this issue on CEC site?

Re: Received modulation is good only if IFS is 1400-1810

andrea@...
 

I confirm also the hardware configuration. I run the nextion display and the CEC firmware.

Re: Miswired USB, need help fixing display #ubitx #radiuno

Arv Evans
 

Andrew

It is easy to test a particular digital pin on the Arduino.  Add a resistor and LED to the
suspect pin and modify the "blink.ino" program to do a slow blink on that pin.  If it blinks
the output mode is probably good.  Then set the pin in software for INPUT_PULLUP
and add a switch to ground.  With software reading state of that pin you can see the
state change when you pull it to ground. 

Arv
_._


On Sun, Oct 7, 2018 at 1:40 PM Arv Evans <arvid.evans@...> wrote:
Andrew

Yes, sounds like a new Arduino Nano is in order. 

But if you want to play a bit, why not connect D7 on the LCD to a different digital output on the
Nano and then make the same change in software.  That could prove, or disprove that the
Arduino port is good or bad.  Never give up until all possibilities have been beaten into the
ground!  8-)

Arv
_._


On Sat, Oct 6, 2018 at 9:42 PM Andrew Kasurak <va2qch@...> wrote:
Ok, I've got the raduino in the ubitx with the lcd removed, hooked up to the computer via usb and watching the frequency on wsjtx. I've got probes on RS, E, and D6.  When I spin the frequency knob I capture state changes on those pins. RW is properly low at all times. RS is normal high, E is normal low and has regular pulses to high, D6 is normal low and has long irregular shifts high-low (looks like a data stream).

On another set of captures (I can only probe 4 at a time), I see transitions like data on all data pins EXCEPT d7, which is just at a constant 1v. So I'm guessing that's a problem :)

So I guess I cooked my arduino D8 pin, it's not what I would have expected. I'm going to see if I can get A7 to cover the load, or if I have other pins dead.

Thank you both very much for the help

Re: Miswired USB, need help fixing display #ubitx #radiuno

Arv Evans
 

Andrew

Yes, sounds like a new Arduino Nano is in order. 

But if you want to play a bit, why not connect D7 on the LCD to a different digital output on the
Nano and then make the same change in software.  That could prove, or disprove that the
Arduino port is good or bad.  Never give up until all possibilities have been beaten into the
ground!  8-)

Arv
_._


On Sat, Oct 6, 2018 at 9:42 PM Andrew Kasurak <va2qch@...> wrote:
Ok, I've got the raduino in the ubitx with the lcd removed, hooked up to the computer via usb and watching the frequency on wsjtx. I've got probes on RS, E, and D6.  When I spin the frequency knob I capture state changes on those pins. RW is properly low at all times. RS is normal high, E is normal low and has regular pulses to high, D6 is normal low and has long irregular shifts high-low (looks like a data stream).

On another set of captures (I can only probe 4 at a time), I see transitions like data on all data pins EXCEPT d7, which is just at a constant 1v. So I'm guessing that's a problem :)

So I guess I cooked my arduino D8 pin, it's not what I would have expected. I'm going to see if I can get A7 to cover the load, or if I have other pins dead.

Thank you both very much for the help

Re: uBitx Software Update

Jens / DH1AKY
 

Hi Jens,

not a problem at all: please look here: http://ubitx.net/
Also you find many youtube videos concerning the KD8CEC firmware.
Ian also describes how to install on his blog http://www.hamskey.com/2018/09/ubitx-firmware-cec-version-11-release.html#more
There he provides precompiled hexfiles for easy upload. You don't need the bitx Manager tool at this point.
See http://www.hamskey.com/2018/01/how-to-upgrade-ubitx-firmware.html for installing the firmware.

73 Jens/DH1AKY

Re: IF OUT uBitx sensitivity loss

iz oos
 

I have just measured the sensitivity loss with an AD8307. Q32 instead of amplifying 7-8db it attenuates by the same amount, so total loss is about 15db as I estimated with just the S3 signal generator.


Il 07/ott/2018 15:41, "iz oos" <and2oosiz2@...> ha scritto:

Ah I said C31 but it was between R37 and C32. R37 is between R36 and C32 so what I have done is very close to your suggestion (R36). The strange thing is that I restored without the IF-OUT and I think there is around 15-20db loss. I tested with a small signal generator and the S3 signal I heard well before is now around noise floor.


Il 07/ott/2018 15:10, "Mvs Sarma" <mvssarma@...> ha scritto:
Sorry, I would have said R36. NOT R35



On Sun, Oct 7, 2018 at 5:59 PM iz oos <and2oosiz2@...> wrote:

Using a cheap tester, diode test, between the base and the emitter of Q30, Q31, Q32, Q70 I get around 850. Testing the other way round from the emitter to the base I get 1300 for Q30 and Q31 and nil at Q32 and Q70. Is that normal or is it an indication of a component failure?
Il 07/ott/2018 07:56, "Mvs Sarma" <mvssarma@gmail.com> ha scritto:
>
> You may better use a 0.01uF (10nF) from emitter resistor R35. The output could be taken through a screened cable and used. Only issue would be , if the load side of your add on equipment feeds any singal while in Tx mode, it would interfere the working of Tx.
> All the best
> sarma
>  vu3zmv
>
>  
>
> On Sat, Oct 6, 2018 at 10:56 PM iz oos <and2oosiz2@gmail.com> wrote:
>>
>> 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: Received modulation is good only if IFS is 1400-1810

Dr. Flywheel
 

In my case (ubitx V4 with CEC software) I need to set the IF SHIFT value to 2500 in order to get a very nice audio sound. My VFO and BFO are properly calibrated; therefore it is likely that filter component behavior is responsible for the oscillator frequencies hitting to the side of the 45 MHz and 12 MHz filters. There is a way to compensate for this behavior by adjusting the IF_SHIFTVALUE stored in the EEPROM. At this point, I chose to ignore the problem and just set the IF SHIFT manually, since I do not have time to work on my uBitx software right now.

I wonder if people on this list can tell us what is the EEPROM value stored at the IF_SHIFTVALUE location, for their specific uBitx (if they are using the CEC software).

Thanks,

--Ron    N7FTZ


On Sun, Oct 7, 2018 at 10:41 AM Jens Uhlig <uhlig@...> wrote:
Hi Andrea, 

that is exactly my problem too!
I have to switch on IFS and shift it to the right edge. (On my Nexion Display)

Did not found a solution so far.
Setting up the BFO did not cure the Prob.

73 de DL7JU 
Jens 

*** mobil ***

Am 07.10.2018 um 19:25 schrieb "andrea@..." <andrea@...>:

Hi,
is it normal that I can listen correctly only if the IFS value is around 1400-1810 as value?

Re: Received modulation is good only if IFS is 1400-1810

Jens Uhlig
 

Hi Andrea, 

that is exactly my problem too!
I have to switch on IFS and shift it to the right edge. (On my Nexion Display)

Did not found a solution so far.
Setting up the BFO did not cure the Prob.

73 de DL7JU 
Jens 

*** mobil ***

Am 07.10.2018 um 19:25 schrieb "andrea@..." <andrea@...>:

Hi,
is it normal that I can listen correctly only if the IFS value is around 1400-1810 as value?

Received modulation is good only if IFS is 1400-1810

andrea@...
 

Hi,
is it normal that I can listen correctly only if the IFS value is around 1400-1810 as value?