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Re: CW/SSB Quarz filter with tunable bandwidth #ubitxcw #cw filter #ssb filter #ubitxcw #cw #ssb

HB9FIH
 

Hallo Karl-Heinz

I also have studied about this Filter made from Quarz. (I also own a HB-1B) - and soon an assembled uBITX (end Nov back in HB9)

I let them with the Quarz Filters in mind. First I build the uBITX as Original, then add some Features.

Also the CW Audio - Filter from SOTABEAMS - which has a vy sharp Bandwith from 300Hz. When I see it could be more narrow then I think about the Quarz Filter.

If you do the Filter - then post a report, maybe othes are interested.

73 Erich

 

 


CW/SSB Quarz filter with tunable bandwidth #ubitxcw #cw filter #ssb filter #ubitxcw #cw #ssb

karl-heinz@...
 

Dear uBITX enthusiasts.

recently my uBitx transceiver has been finished. I find this project ufb because it is an excellent learning platform for me.

As with many others, a number of modifications are on the agenda now after I installed the uBitx into a case.

One of these modifications concerns the construction of a CW filter.

Up to now mostly audio filters have been described, whereby active filters are described with operational amplifiers or DSP filters with microcontrollers. I can understand that these two solutions are easy to integrate into the transceiver.

Looking at the circuit diagram of my CW transceiver HB-1B from Youkit I noticed that this transceiver uses a quartz filter whose bandwidth can be continuously changed with capacitance diodes (synonms are varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode). A quick search with Google gave this inofficial link to the circuit diagram of the HB-1B: https://matfyz.estranky.sk/fotoalbum/hb1b.-.html

I didn't find much information about this type of SSB/CW crystal filter. But I am impressed by the acoustic result of the simple circuitry of my HB-1B and wonder why this alternative has not been discussed in the uBitx modifications so far.

TenTec has patented this filter: https://patents.google.com/patent/US5051711A/en, which describes the passband curves of this filter.
On a German website (http://funkamateure-dresden-ov-s06.de/index.php?article_id=174 ) I found very recent measurement results on the bandwidth of these filters, which match the data from the TenTec patent.

Based on this little information the possibility to build a tunable quartz filter seems to be very interesting. Since I only deal with electronics as a hobby, I would like to know if there are any arguments against this filter.

And: does anybody know how it performs when compared to the audio filters?

Many greetings

Karl-Heinz
DF9RU


Re: uBITX CW - digital input?

Don, ND6T
 

Rob,

You can also do what I did; Use the Nano D1 and write your own firmware. I prefer to use my own keyer, etc. and that makes it possible. I can then use my own tuning method and other stuff like that. Not for the faint of heart but quite educational. 73, Don


Re: V5 uBitx CW issues

Philip
 

Version 1.200  is the lastest


Re: V5 uBitx CW issues

Yigal Tal
 

Hi Dennis
Can you please give a link from where you downloaded firmware Versia  1.22 ?
I can't find this version.
Thank you.


Re: no rf output #bitx40help

Evan Hand
 

Can you verify that you have PA power to the IRF510s?  I would verify that it is on pin 2 of both IRF510s.  Note, the PA power is always there, even in receive.  Without the bias voltage, the IRF510 are pretty much open circuits.

Schematic link if you do not have it: http://www.hfsignals.com/wp-content/uploads/2019/02/ubitx_v5.pdf

I suspect that there is a wiring issue in the power to the PA.

73
Evan
AC9TU


Re: uBITX CW - digital input?

Curt
 

Rob

Adding to Jerry's deep answer, the ubitx uses its unusual keying approach out of necessity.  the raduino needs to be involved to change the RF path, and a voltage is read from that one pin to interpret as manual cw or two different voltages for electronic keying. Creative but strange. I have learned to live with its TR delay. Its not something we can bypass without large scale redesign.

Curt


Re: Need Help Troubleshooting Raduino on BITX40

Allard PE1NWL
 

Hi Jimmy,

v1.01 is the original stock firmware and it doesn't support the function
button and other extra features.
For this you would need to upgrade (the latest version is v1.28.1).

Detailed installation instructions are available at
https://github.com/amunters/bitx40/blob/master/installation_instructions/0-software-installation.md

73 Allard PE1NWL


Re: Slow t/r receive recovery #ubitxcw

Ashhar Farhan
 

this seems to be an agc issue. probably the timing cap needs to be reduced.
- f

On Fri, Oct 25, 2019 at 6:56 AM Mark Johnsen <mark.nb1u@...> wrote:
Hello all...
I've recently acquired a v3 uBITX with a K1BQT agc board and running TSW v2.02 software.  How can I decrease the receiver recovery time after I stop sending cw?
Presently it is approximately 3 seconds until I hear signals.
Tnx,
Mark NB1U


Re: no rf output #bitx40help

KG5YUO
 

I purchased a case from amature radio kits .in The receiver works.


 Thanks Bruce

 


Re: uBITX CW - digital input?

Jerry Gaffke
 

The Nano pin used for the keyer input is an analog only input,
there is no digital IO cell in the processor silicon at that pin and thus no pullup resistor available.


The schematics are a bit confusing as connector names are not given and pin numbering is not consistent.
However if you count the pins and check the positions of the ground power pins, you can generally figure it out.

The uBitx wireup diagram is at the top of this page:  http://www.hfsignals.com/index.php/ubitx-wire-up/
Your keyer plugs into connector J1 shown in the lower left, goes into pin 2 of the Raduino 8 pin connector,
and pin 3 is +5v, pin 4 is ground.

The Raduino schematic here:  http://www.hfsignals.com/wp-content/uploads/2017/12/raduino.pdf
shows that P1 pin 2 goes into the A6 pin of the Nano processor.

The Arduino Nano-CH340 clone schematic:  http://actrl.cz/blog/wp-content/uploads/nano_ch340_schematics-rev1.pdf
shows that A6 goes into ADC6 on pin 20 of the Atmega-328P-32TQFP processor chip.
Note that ADC0 through ADC5 of the chip are also named PC0 through PC5, indicating that those
analog inputs can also be digital IO pins.  But ADC6 and ADC7 do not have a PC6, PC7 designation,
since they are analog only.  And that pullups are only implemented on pins with digital IO.

The datasheet for the Atmega-328P verifies that pins ADC6 and ADC7 are analog inputs only.
http://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-7810-Automotive-Microcontrollers-ATmega328P_Datasheet.pdf

Jerry, KE7ER


On Thu, Oct 24, 2019 at 05:31 PM, Rob French (KC4UPR) wrote:
Is there any reason I can't switch the existing uBITX Raduino CW input pin to be digital, INPUT_PULLUP? Obviously it could only be used for straight key in that case, but would it work? I would assume the external pull-up would no longer be required?


Slow t/r receive recovery #ubitxcw

Mark Johnsen
 

Hello all...
I've recently acquired a v3 uBITX with a K1BQT agc board and running TSW v2.02 software.  How can I decrease the receiver recovery time after I stop sending cw?
Presently it is approximately 3 seconds until I hear signals.
Tnx,
Mark NB1U


Re: Need Help Troubleshooting Raduino on BITX40

JD Hill
 

The version that shows up when I power on is version 1.01.
I have tried to load newer version but apparently I am doing something wrong.


uBITX CW - digital input?

Rob French (KC4UPR)
 

Is there any reason I can't switch the existing uBITX Raduino CW input pin to be digital, INPUT_PULLUP? Obviously it could only be used for straight key in that case, but would it work? I would assume the external pull-up would no longer be required?


Re: Need Help Troubleshooting Raduino on BITX40

Allard PE1NWL
 

Hi Jimmy,

what's the firmware version (as shown on the LCD at power on)?

73 Allard PE1NWL


Need Help Troubleshooting Raduino on BITX40

JD Hill
 

Good day all. I have been working on a BITX40 that I purchased earlier this year, so I am certain it is the newest version.  The rig turns on and the display and frequency tuning seem to be OK, however the function switch does not function so that I can do any of the functions to calibrate, etc. The switch is new and even shorting the orange wire going to he switch to ground does nothing. 

Have I possibly got a programming issue or possibly a bad Raduino? This is my first time working with an Arduino of any kind, so I am learning as I go. I really want to get this rig up and running. I plan to use it mostly for CW but I may dabble somewhat with the digital modes.

I will really appreciate any assistance I can get.
Thanks in advance.
Jimmy,  W9JDH


uBITX V5 not working PTT #ubitx-help

Varga Tamás
 

Hello all!

I would also have a quick question. I built an ubitx V5. My problem with it next is when I want to switch to trasmititng with the small micro switch nothing happens. If, on the other hand, I press PTT on a USB cable with Pocket RXTX software over USB, it switches to transmiting immediately.

My question is , is there any other place where the PTT switch is available besides the pin 5 of the contorls connector (ORANGE wire) and the GND (BLUE wire).

I would like to ask if I put a switch between the spindle pin 16 (T / R) and GND, would it work as a PTT switch?

 

That is, if you look at the PTT switch, the orange wire of the VFO panel and the 8 pin audio connector (blue wire) of GND. However, 
if I short this then there is no switch to transmit. Measurements made so far: -GND, ie blue cable to orange cable in RX mode is 4.75V. when I press the switch, the high mark on pin 16 of the mainbord does not appear. Amin is also 0 V by default. - But if I use software PTT on my phone via the arduino CAT cable, it switches to 5V and goes to TX mode. I also include arduino switching. here is in PDF http://www.hfsignals.com/index.php/ubitx-wire-up/ My question is, where do you think I can take the PTT linkage off?
So do you think I could do an additional circuit or something to make physical PTT work?
 



Sorry, my English!


Tnx and 73's Tamas


Re: Spice software

Evan Hand
 

Link works now.

Thank-you!
Evan
AC9TU


Re: Spice software

Jim - W7EZN
 

Just did a successful download.  Thanks for the tip!
--
73! de KJ7EZN   Jim


Re: no rf output #bitx40help

winwoodh@...
 

Check the transmit relay, what are you using to turn TX on?


On Thu, 24 Oct 2019, 13:55 KG5YUO, <wtxrcdog@...> wrote:
Hello I completed my very 5 units and it doesn't seem to transmit. It shows tx on the screen but no output on the power meter/ swr meter and the transmit led dosen't lite up. 
Thanks.
Bruce KG5YUO
"A positive attitude may not solve all your problems, but it will annoy enough people to make it worth the effort."