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Re: Toroids winding information #ubitx

 

What Cesar has not told us other than he has some great antique guns is that he has
6600 function generator. He also has a pico scope.

I've been trouble shooting via whatsapp which is faster than group emails!

The last test done was to feed 500mv to T10 at 7.15MHz and check output - NIL.
Any ideas Jerry!

Raj

At 03/02/2018, you wrote:

Cesar,

I think you have the transformer footprint figured out correctly.

Sounds like you have resolved the PTT issue, and have moved on to
the area of the board where the IRF510's blew as per your first post.
Perhaps T11 did get damaged somehow when the IRF510's blew.
But I'd think more likely it was either L8 or L9 that got damaged, and/or the associated traces.

Jerry


On Sat, Feb 3, 2018 at 08:03 am, C¨¦sar EA3IAV wrote:
I am still debugging and after checking many things inmay have to think of resoldering or remaking the t10 and t11...
I see 10 turns but then 3 wires
which is its dispossition
Pins (square is 1)

6 -? 1
5- 2
4 - 3

a - a¡¯
b - b¡¯
c - c¡¯

Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

 

¿ªÔÆÌåÓý

I know I'm late to this party but you cannot swap crystals on nano board without first using a atmel programmer to burn the fuse bits that tell what freq it will be using or you will brick your nano.... also if the ftdi or whatever usb chip is using 12mhz, you could get the sparkfunPro 16mhz/8mhz board that does not use usb but instead uses usb to serial cable to upload. Be warned 16mhz board is 5 volt and 8 mhz is 3.3 volt.

I only use the Sparkfun Pro 16 for my projects. Another note if you go with the ATMega32U4 boards they have built in usb....

Maybe this will help someone or maybe not....

James Lawrie

Sent from my Galaxy Tab A

-------- Original message --------
From: Arv Evans <arvid.evans@...>
Date: 2/3/18 09:38 (GMT-06:00)
Subject: Re: [BITX20] #ubitx-help Strong Audio Tones in and outside audio receive passband

Jerry

Interesting observation that the 12 MHz USB clock oscillator is on nearly the same frequency
as the uBITX IF and BFO.? If the BFO is offset to the high side of the IF passband it could well
be within audio range of the USB clock frequency.? If this is the problem then it might be possible
to pull the USB clock crystal down with a small parallel capacitor.? That should not make a
significant change in USB clock timing but could take it out of range of the receiver IF and BFO
frequencies.? Some experimenting is probably necessary to tell how far to pull the crystal.? It
would not be good to accidentally put it within the IF filter passband.

Arv? K7HKL
_._


On Sat, Feb 3, 2018 at 1:47 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
I assume you mean changing the Arduino crystal, not cap.

The 16mhz ATMega328P crystal is about 3mm x 1.5mm, goes to? ATMega328p pins 7 and 8.
It is on the top of the Nano, just above the silk for edge pin D5.
Seeing the actual crystal now, and not just looking at datasheets and schematics, I see that it is
extremely small.? ?I doubt most of those with uBitx in hand will want to mess with it.

I bought some spare Nano clones, I believe they're identical to what's on the Raduino.
Mine have a CH340G chip on the back of the Nano for the USB interface.
This chip has another 3mm x 1.5mm crystal nearby, this one happens to be 12mhz.
? ??

Quite possibly it is the 12mhz oscillator for the USB interface that is causing the trouble in at least some cases.
Though in post 40432 it was reported that a finger on the Nano's crystal caused the tones to vary,
which suggests that case was due to the 16mhz crystal since the 12mhz crystal is not usually accessible.

None of this was ever a problem on the Bitx40v3, far as I know.
I'd like to think there will be a simple fix, perhaps soldering in a bit of copper tape somewhere for shielding,
or adding a few caps.? ? Moving the IF would be pretty disruptive.

Jerry



On Fri, Feb 2, 2018 at 11:55 pm, Ashhar Farhan wrote:
changing the arudino cap is going to be a challenge as the arduino is soldered and you need to access it from the underside to desolder it. we had to resort to solder it in as keep it on a socket was leading to bulge and an additional failure point on the board.
?
Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

John
 

Further tests and head scratching.
?
Since I replaced the Arduino and mounted it on female headers I decided to do more tests to try to answer some of the leads and questions in the thread.
?
I used some 20cm (8 inch) female-male connectors and connected the Arduino remotely from the Radiuno so that I had access to the 12Mhz crystal next to the CH340G chip underneath the Arduino board.
?
The radio has been re-calibrated and shows a difference of less than 10Hz on a 10M beacon and on an 80m CW training transmission from our WIA here in Sydney, so I suspect it is pretty accurate in frequency.?
?
I then re-did a BFO adjustment both on the factory side (low side) of the 12Mhz filter and on the other side. By observing the audio spectrum I adjusted the BFO so that the passband was as close as I could tell 500Hz to 2400Hz.
?
I then in each case moved the first and 2nd VFO to shift the alignment of the two crystal filters and noted the change in signal strength between the factory default and the peak.
?
Results:
?
1. Factory side of BFO adjustment results in a BFO frequency of 11,996.6Khz while the opposite side of the pass band results in a BFO of 11,999.5Khz. So as expected there is a difference of around 3KHz between a low side and high side BFO. And the centre of the filter appears to be at around 11,998Khz which I suspect is pretty normal. Please comment if you think it is not.
?
2. The tuning clicks and tones within the pass band have definitely disappeared as mentioned in a previous post.
?
3. The tones outside of the passband are still there for some values of the BFO and shift by 550Hz for each change of 100Hz of the BFO. Note that the receiver is usable as the tone free BFO values result in a passband that is more or less 500-2400Hz.
?
4. Going with the BFO on the high side of the filter produces similar results. I just noted that the passband seems less steep on the low audio frequencies when in this configuration. Of course in that case LSB becomes USB and vice-versa.
?
5. Now the part I can't understand: while listening to a fixed signal (the CW training transmission on 80M) AND positioning the BFO frequency so that strong tones would be heard and seen on the spectrum at 13,379Hz, I touched the three crystals in turn: the 16Mhz Arduino one, the 12Mhz CH340G one, and the 25Mhz VFO one.?
?
The first two did not produce any difference in Rx signal or tones. Touching the 25Mhz one produced a shift in the received signal audio frequency BUT NOT in the tones frequency.?
?
This does not make sense to me as if the si5351a clock was to shift, any beat of harmonics should produce a shift in frequency.
?
And yet if I adjust either the BFO frequency OR the 1st and 2nd oscillators frequencies I get a shift in tones frequency.
?
So if the tones were geneated after the filter or in the audio circuit I can't see how they would shift in frequency when I change some oscillators frequencies. And if they were generated before the 12Mhz filter they should shift and the 25Mhz crystal shifts!
?
Any idea why that is?
?
6. I used the code below to shift the alignment of the first xtal filter and the 12Mhz xtal filter. I noted improvements in signal level (I assume the Rx amplification chain is more or less linear) of 3 to 6dB. So less that the 8dB I reported before but still not negligible.
?
The peak seems with a first and second VFO about 2 to 3Khz above their default values.
?
The shift is reset to zero each time the Arduino is reset and is not saved in EEPROM at present.
?
It would be interesting to see if some other units show the same changes in signal strength.

I noted that some shifts would produce tones and these tones would shift in frequency too, and by 4,000Hz for each change of 1,000Hz of first and second VFO frequencies. (as opposed to 550Hz for each 100Hz of the BFO).
?
I made the following changes in the ubitx_20 file:
?
A. I inserted the following after the line "unsigned long frequency, ritRxFrequency, ritTxFrequency;? //frequency is the current frequency on the dial"
?
//VK2ETA test spur, change first IF and Second IF to shift the first IF but keep the rig Rx frequency the same
unsigned long firstIfShift = 0;
?
?
B. The setFrequency method became:
?
void setFrequency(unsigned long f){
? uint64_t osc_f;
?
? setTXFilters(f);
?
? if (isUSB){
//VK2ETA first IF shift
//? ? si5351bx_setfreq(2, SECOND_OSC_USB - usbCarrier + f);
//? ? si5351bx_setfreq(1, SECOND_OSC_USB);
? ? si5351bx_setfreq(2, SECOND_OSC_USB + firstIfShift - usbCarrier + f);
? ? si5351bx_setfreq(1, SECOND_OSC_USB + firstIfShift);
? }
? else{
//? ? si5351bx_setfreq(2, SECOND_OSC_LSB + usbCarrier + f);
//? ? si5351bx_setfreq(1, SECOND_OSC_LSB);
? ? si5351bx_setfreq(2, SECOND_OSC_LSB + firstIfShift + usbCarrier + f);
? ? si5351bx_setfreq(1, SECOND_OSC_LSB + firstIfShift );
? }
??
? frequency = f;
}
?
?
C. The doRIT method became:
?
void doRIT(){
? unsigned long newFreq;
?
? int knob = enc_read();
? unsigned long old_freq = frequency;
//VK2ETA first IfShift
? unsigned long old_shift = firstIfShift;
??
?
? if (knob < 0)
//? ? frequency -= 10l;
? firstIfShift -= 1001;
? else if (knob > 0)
//? ? frequency += 100;
? firstIfShift += 1000;
?
//? if (old_freq != frequency){
? if (old_shift != firstIfShift){
? ? setFrequency(frequency);
? ? updateDisplay();
? }
}?
?
To use it: select a preferably fixed tone signal like a broadcast station. Press the encoder and select RIT ON. Turn the dial and note the change in signal strength. Sorry I don't have a display of the 2nd VFO frequency at present. Each step is a shift of 1000Hz in VFO frequency.
?
?
All the best,
?
73, John (VK2ETA)
?
Re: uBITX woes, feeling disheartened. #ubitx

 

I have no idea what your sets of pins are.?
Read this post to understand the relay pin numbering,?
and how the rail labeled "TX" gets connected to 12v when you press the PTT switch to transmit.?
? ??/g/BITX20/message/40808

When receiving, the relay contacts are as show in the schematic.
Pin 8 of K3 is not getting power during receive, so it is zero volts and the relay is not energized.
M1 and M3 are low level received audio, and should be close to zero volts.
The antenna at K3-12 is connected to K3-14 from which the received signal continues on through K1 and into the receiver.
The antenna also has a low level signal, and you will see close to zero volts on those pins too.

When transmitting, the TX 12v rail powers the K3 relay coil by putting 12 volts on pin 8.
M1 and M2 get disconnected when the relay is energized, in hopes of somewhat reducing the PTT? audio pops.
The antenna is connected to the IRF510 power amp through K3-12 and K3-16, there will be perhaps 30 volts RMS of RF signal
on pins 12 and 16 while transmitting, though the signal is centered on ground due to the transformer at T11, your DC voltmeter won't
accurately show what is going on there when transmitting.? The meter will likely read around zero volts, though the strong RF
transmit signal could conceivably damage some meters.


On Sat, Feb 3, 2018 at 05:53 pm, @AC8XZ wrote:
hello all? First poster;?? k3 suppose to have voltage all the time?? on rec first set of pins have none. second set/3 have 11.8 v last one no voltage. on trans.1st third and fourth set of pins have11.8v. I can hear ke clicking when I hit ppt.?? AC8XZ
Re: uBITX woes, feeling disheartened. #ubitx

[email protected]
 

hello all? First poster;?? k3 suppose to have voltage all the time?? on rec first set of pins have none. second set/3 have 11.8 v last one no voltage. on trans.1st third and fourth set of pins have11.8v. I can hear ke clicking when I hit ppt.?? AC8XZ
Re: #ubitx Current draw when transmitting? #ubitx

 

SSB only draws current when you speak into the microphone or in the case of digital, transmit a frequency.
?


Sent from Yahoo Mail.


On Saturday, February 3, 2018 5:53 PM, Ghericoan <boakawizkid@...> wrote:


Okay, so I am not going bonkers over the changes in amperage. Something else that I noticed, psk31 on 40m pulls 1.5 amps, but feld-hell pulls only 0.8 amps...any idea why?
--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist


Re: First Arduino sketch loaded

James Lynes
 

Met Bjarne in a Birds of a Feather session at an OOPSLA(Object Oriented Programming Systems and Languages) conference in the Pacific Northwest. just to further name drop, I also met Ester Dyson at the same conference. Her Release 1.0 newsletter was always a great source to where the software industry was going.

Objective C always made more sense to me than C++.

James
Re: #ubitx Current draw when transmitting? #ubitx

 

Okay, so I am not going bonkers over the changes in amperage. Something else that I noticed, psk31 on 40m pulls 1.5 amps, but feld-hell pulls only 0.8 amps...any idea why?
--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist
Re: #ubitx Current draw when transmitting? #ubitx

 

It's in the right range. The draw and output depend heavily on frequency. You can see the draw I measured key down into a dummy load at different frequencies in this post /g/BITX20/message/40043
Re: BitX40 v1.27.7 SPOT mode

 

Ah, that explains!
In your case you'd need to round to the nearest 10 Hz.

at line 481:
ultoa((frequency + 50), b, DEC); // construct the frequency string

change to:
ultoa((frequency + 5), b, DEC); // construct the frequency string

73 Allard PE1NWL

On Sat, February 3, 2018 20:34, Vic WA4THR via Groups.Io wrote:
Thanks, Allard. I'm thinking perhaps to eliminate the +50 in my version
since I am displaying an extra digit in normal mode. Do you know where
(what line) that rounding takes place?

73, =Vic=
WA4THR
Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

 

USB requirements are rather stringent. Unless
the 12 MHz crystal has changed radically in frequency, it should
be pretty much left alone. (If it has changed or if it interferes,
the best solution is to replace the whole thing). Easy enough to determine:
try using the USB interface. If it communicates, all is ok.

Usually in the arduino, as in most uC's, most RFI problems are traced to the
external (16 MHz) crystal, or leakage into the power supply. If one is
not ready to replace the unit, the best solution is a new crystal; it can be
any of a number of frequencies. What changes is the timing span.

Alternately, one can try to shield everything -- especially the leads
going to other parts of the rig. Sometimes, the lcd is noisy and not
much can be done about it except to change the programming to
change the update method. But usually, that is a KHz and
not a MHz problem. In this case I would not discount it, however,
since the problem is audio sidebands.

john
AD5YE
Re: BitX40 v1.27.7 SPOT mode

 

Thanks, Allard. I'm thinking perhaps to eliminate the +50 in my version since I am displaying an extra digit in normal mode. Do you know where (what line) that rounding takes place?

73, =Vic=
WA4THR
Re: uBITX AM BCI Filter #ubitx

 

Thanks Nick

I will put up the further details on the news item on uBITx.net

I am sure that your mod will be widely adopted for those of us who are aflicted by nearby AM broadcast stations.

Mike

On 3/02/18 11:40 PM, Nick VK4PLN wrote:

Yes I cut the trace either side of the new HPF board, exposed a bit of the trace and jumperd onto that.
You need to cut the second trace from the PA side. They are in order:
1: TX pwr to the PA circuits via R89
2: RX path (between K1 and K3 relays. (CUT AND INSERT HERE)
3: TX pwr to the LPF bank.
4: RX pwr to the receive circuit (R18,R38...)

I picked up GND from the 2 unused caps C216 and C210
Filter Details: /g/BITX20/wiki/uBITX-AM-BCI-Filter
--
Mike Woods
mhwoods@...
UBITX COLOUR TOUCH DISPLAY CONTROLLER V.2.72U PHOTOS #ubitx

 

UBITX V.272U -FRONT PANEL VIEW
TOP INSIDE VIEW

From atmega 2560? - 3 cables for clocks and 6 pin harness to ubitx 2 cables for SI5351

Lower left are 2 voltage down converters - 1 adjusted to 9v for the atmega?
The other is same except it feeds the DDS SI5351 at? 5 volts
They provide isolation lower regulated voltage extra filters and hash filters.
This results in no discernable vfo clicks on tuning or noise from the Digital boards.
Cheap at around $1.50 each.... ebay....
Lower right is the SI5351 DDs module from Adafruit...

I feed the usb from the Atmega to the rear of the case so? I can program it without removing the radio cover.


Connectors at rear for Digital? stuff - mic, speaker computer audio -- I still am wiring in the mic

Just a quick look at the pin connections
Details to follow


73
joe
VE1BWV

20180203_124257.jpg
20180203_124257.jpg
20180118_234137.jpg
20180118_234137.jpg

UBITX COLOUR TOUCH DISPLAY CONTROLLER V.2.72U Released #ubitx

 


Good Afternoon All,

VU2SPF - Dr. SP Bhatnagar(INDIA) and VE1BWV Joe Basque (CD)? are pleased to announce
?
The initial public release of the UBITX Colour Touch Display Controller v2.72u
This is essentially? the same as the one for BITX, but modified to work with the UBITX
The new software provides? a Colour Touch Display Controller with a no menu approach? to control your ubitx .?



More info:
? ?- for latest code
Videos on You tube - search for vu2spf or vu2spf ubitx
Facebook Bitx 20


Features:
?
1. Low cost for parts - Suggested parts -? 1 atmega2560 - approx $8.00US, 1 Addafruit dds Si5351 - $10.00? -? 2.8 TFT? touch colour display? ? ?$12.00 US
?
2. All bands, band selectivity, USB LSB? -Works well with digital modes
?
3. All Display buttons are touch control - and no menus?
?
4. Any button can have a physical button and a TFT touch or any combination.
?
5. 100 memory channels
?
6. Tunable BFO's
?
7. 3 VFO'S - A? B? and? MEM
?
8. USB / LSB
?
9. TX? timeout control
?
10. Touch TX button and or physical TX control - for ptt mike or digital modes (vox input low)
?
?
Next?: New Feature - Working on adding? Cat Control.


73
From Team TFT
VU2SPF (SP) AND VE1BWV? (Joe)? (joeman2116@...)

?
?

20180125_200357.jpg

Re: Toroids winding information #ubitx

 

Cesar,

I think you have the transformer footprint figured out correctly.?

Sounds like you have resolved the PTT issue, and have moved on to?
the area of the board where the IRF510's blew as per your first post.
Perhaps T11 did get damaged somehow when the IRF510's blew.
But I'd think more likely it was either L8 or L9 that got damaged, and/or the associated traces.

Jerry


On Sat, Feb 3, 2018 at 08:03 am, C¨¦sar EA3IAV wrote:
I am still debugging and after checking many things inmay have to think of resoldering or remaking the t10 and t11...
I see 10 turns but then 3 wires
which is its dispossition
Pins (square is 1)

6 - ?1
5- 2?
4 - 3

a - a¡¯
b - b¡¯
c - c¡¯?
Re: Second batch of uBITX shipping? #ubitx

 

I ordered mine December 18th and receive this today....

"We will be shipping your order early next week. Tracking details will be updated soon."



On 3 Feb 2018 9:45 am, "KK6VLV via Groups.Io" <syema2=[email protected]> wrote:
RE:?/g/BITX20/message/41078
Thought I would get tracking info by end of the day yesterday, but no.
Still waiting for tracking info.

Hoping tracking info will come in Monday.
--
KK6VLV

Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

 

These are $2 Nano clones, and both of those crystals are almost microscopic.
USB spec says the 12mhz crystal must be correct within 0.25%, or 30khz.
The 16mhz crystal doesn't need to be any more accurate.??

But maybe they are accurate enough, and pulling either or both lower with parallel caps
will cure this issue.? Ideally far enough to miss both high and low side BFO placement.

Some 0201 caps across the IC pins may be the easiest way to hack them in.? ?;-)
But I think shielding/bypassing should be looked at first.

If the 12mhz crystal were the problem, we could just shut it down entirely when not using the USB port.
But post 40432 says tones vary when finger is on the 16mhz crystal, suggests it is harmonics of the 16mhz
causing trouble.? Note that the CH340G and 12mhz crystal are on the back of the Nano, away from the radio.?

Jerry



On Sat, Feb 3, 2018 at 07:39 am, Arv Evans wrote:
Jerry

Interesting observation that the 12 MHz USB clock oscillator is on nearly the same frequency
as the uBITX IF and BFO.? If the BFO is offset to the high side of the IF passband it could well
be within audio range of the USB clock frequency.? If this is the problem then it might be possible
to pull the USB clock crystal down with a small parallel capacitor.? That should not make a
significant change in USB clock timing but could take it out of range of the receiver IF and BFO
frequencies.? Some experimenting is probably necessary to tell how far to pull the crystal.? It
would not be good to accidentally put it within the IF filter passband.
?
Arv? K7HKL
Re: Nextion display

Vince Vielhaber
 

Thanks Fred! I had already ordered one but it won't be here for a bit. Coming from China. Anyway with the tool downloads I found it easier to just download the entire site - so I did. So if the info ever disappears, I have a copy.

Vince.

On 02/03/2018 06:12 AM, Dr Fred Hambrecht wrote:
For those that may be considering the Nextion display, let me suggest
you start out by going to their website Https://nextion.itead.cc On the
home page select download and select the Nextion editor.
This will give you a chance to play without spending any money on buying
the actual display but allows you simulate the display and see if it
meets your needs.

V/R
Fred W4JLE
--
Michigan VHF Corp.

Toroids winding information #ubitx

C¨¦sar EA3IAV
 

I am still debugging and after checking many things inmay have to think of resoldering or remaking the t10 and t11...
I see 10 turns but then 3 wires
which is its dispossition
Pins (square is 1)

6 - ?1
5- 2?
4 - 3

a - a¡¯
b - b¡¯
c - c¡¯?

?

thanks
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