The sound from my uBitx has no bass. It sounds like an ancient mini-transistor radio receiver. Is the speaker from the Inkits case so bad?? My Youkits HB-1B on the same frequency and small external speaker sounds much better. Inkits case is relatively big, sound should by far better I think.
Ivo,OK2SHI
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Re: What does zero-beat sound like?
#ubitx
Easy enough to place the BFO at the center of the 12mhz crystal filter, then the near zero hz beat comes through strong as ever. In the equations of post? ?? /g/BITX20/message/44278just set the value of "pbt" to zero. There is capacitive coupling through the audio chain that will attenuate those extremely low frequencies, that may need to be adjusted somehow.
On Thu, May 31, 2018 at 09:02 am, Tim Gorman wrote:
The biggest problem is that the SSB
filter causes a drop-off at the lower frequencies making the beat tone
disappear. You kind of have to interpolate even with the meter.
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Nextion LCD User and all
I released the version (V1.080) and experimented with various things.
from the beginning of uBITX firmware development, there was a request support for Nextion LCD.
Since version V1.073, various LCD was supported (Except Nextion LCD)
Some users have sent related materials to Nextion LCD and I have purchased Nextion LCD.
I do not know how to use Nextion LCD well.
I have seen DMR Hotspot use Nextion LCD.?I was surprised to see that users could easily implement their own UI programs on the Nextion LCD.
I can not use the Nextion LCD well but the interface with uBITX is implemented.
You do not need any hardware modifications to use the Nextion LCD.
Just remove the existing LCD and connect the Nextion LCD in place using 5 Lines.?It looks like an I2C LCD.
Like the DMR Hot Spot, I think users will be able to pick and use the UI.
If you want UI programming on Nextion LCD, please send me mail (with your mail address)
also?Please email me if you can beta test my protocol or 2.4 "LCD. I will send you a code to test Nextion LCD with uBITX and template code for Nextion LCD UI Designer.
I am making a UI suitable for 2.4 "LCD based on Template.?It's a $ 17 LCD that I bought from Aliexpress, but it's still good.
Ian KD8CEC
I am interested in this too. I have not received ?my ubitx yet but have been playing around with the Arduino and stm. I've ?not had much luck with stm ?f303k8 ?nucleo , mostly because like it has been mentioned library ?issues ?I have not tried ?the ?blue pill or the f4 boards I have.
--
73's ?kn4ud
Allen ?Merrell
-- Best 73 KD8CEC / Ph.D ian lee kd8cec@...
(my blog)
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Re: Need Clarification on uBitx v. 4 Schematic
ALTERNATIVE
?
?
Dr. William J. Schmidt - K9HZ
?
From: [email protected] [mailto:[email protected]] On Behalf Of Mike
Sent: Wednesday, May 30, 2018 11:21 PM
To: [email protected]
Subject: [BITX20] Need Clarification on uBitx v. 4 Schematic
?
Regarding the new version 4 schematic:
Do new components Q942 and Q952 connect in parallel with the IRF510's as per schematic or
are?the RD15HV's meant to be used as an?alternative to the IRF510's?
Thanks,
Mike
-Mike
?
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Re: SDR as Waterfall display
BTW on transmit you get the transmitted signal spectrum.? Quite nice! (I do reduce the gain on transmit!).? FreqShow runs on a Pi¡ needs to be moved to a Teensy. ? ? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ email:? bill@... ? ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of K9HZ
Sent: Wednesday, May 30, 2018 8:47 PM
To: [email protected]
Subject: Re: [BITX20] SDR as Waterfall display ? So I¡¯ve actually done this¡ I used this SDR:? ?? which tunes down to 24 MHz.? I tapped into the uBITx IF at TP14 on the rev4 schematic¡ before the 45 MHz roofing filter so the IF spectrum is still wide banded¡ used a 5pf cap as not to load the IF.? I ran that into an IF amplifier made from a MC1350P circuit for 45 MHz right out of the app note.? The response from 1-30 MHz is not flat, so I took an analog pin from the Arduino to set the AGC on the MC1350P and developed a table that generates an AGC voltage for each band as selected that is calibrated basis a known input signal to give dBm on the waterfall.? The software I used for the spectrum display is Freq-show from here: .? It works very well.? I will post a video when my ubitx is back together (currently adding¡ yes¡ a ¡°second¡± receiver¡ ohhhhh!).? I¡¯m not an expert coder, but once this Python app can be coded into the Teensy, I think we have an all-in-one solution! ?
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Re: Need Clarification on uBitx v. 4 Schematic
To my eye, it looks like parallel, though I'm left wondering how they'd mount. The RDs would have better 10/12m performance, the IRFs better at 80/40m. Not quite sure on biasing/static currents, but sure interested.
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Re: The new uBITX boards are here
I got mine today! Yee-Haa!
Jack, W8TEE
On Thursday, May 31, 2018, 12:15:34 PM EDT, Kevin Luxford <kbgluxford@...> wrote:
Sarma, by strange coinci?ence our labs requiring all those computations were associated with wavelengths of spectral lines of substances at room temp then cooled with liquid nitrogen.
Email from Farhan confirms my version 4 is in the tender care of India Post.
73 Kevin VK3DAP / ZL2DAP
--
? Kevin B. G. Luxford
|
Re: The new uBITX boards are here
Sarma, by strange coinci?ence our labs requiring all those computations were associated with wavelengths of spectral lines of substances at room temp then cooled with liquid nitrogen.
Email from Farhan confirms my version 4 is in the tender care of India Post.
73 Kevin VK3DAP / ZL2DAP
--
Kevin B. G. Luxford
kbgluxford@...
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Teensy I2c on wire2 (SDA2/SCL2)
#ubitx
Has anyone ever gotten the I2C LCD display AND the Si5351 clock chip to operate on SDA2/SCL2?? Looking to get that running on a Teensy3.6 if possible.? Any help from the group would be very much appreciated.
Jim Sheldon, W0EB
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Re: Simple sound card interface
#ft8
Thanks Doug,
I followed your instructions and was able to make several FT8 contacts yesterday. I wonder what the 1K resistors are for across the audio outputs. Can they be eliminated?
73, Dennis
W7DRW
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Re: What does zero-beat sound like?
#ubitx
Interesting, I will have to look at this at a level that is more than casual. I was thinking that one would be discriminating to the limit of zero Hz.
I do like the idea of the Nano or Uno or... serving as the measuring instrument because I am tone death too.
On Thu, May 31, 2018, 11:16 AM Jerry Gaffke via Groups.Io <jgaffke= [email protected]> wrote: The 30x improvement by calibrating at 30mhz vs calibrating at 1mhz is not theoretical,
even if your hearing is shot.
Instead of looking for a 10hz change in tone, you are looking for a 300hz change.
The ideal might be to monitor the audio from a Nano analog pin, have it look?
for either zero-beat or a specific tone.? Especially for those like me who are tone deaf.
With FFT's on an ARM processor like the Teensy, could discriminate the carrier from
the audio tones on WWV.
On Thu, May 31, 2018 at 08:02 am, Mike aka KC2WVB wrote:
?It seems to me to be without question that if one were to allign/adjust/tune an oscillator to a precise frequency by listening for a zero beat with respect to a known reference frequency that the higher the reference frequency the greater the accuracy with respect to alignment of the oscillator. However, if done by human ear the entire procedure is only as precise as the individual's ability to detect the a a absence of low frequency audio signals. So for someone like me who has been yelled at by kid's, dogs and other assorted life forms for 63 years the theoretical may be a bit of a moot point?
|
Re: What does zero-beat sound like?
#ubitx
On Thu, 31 May 2018 11:02:34 -0400 "Mike aka KC2WVB" <rb5363@...> wrote: Just a thought:
It seems to me to be without question that if one were to
allign/adjust/tune an oscillator to a precise frequency by listening
for a zero beat with respect to a known reference frequency that the
higher the reference frequency the greater the accuracy with respect
to alignment of the oscillator. However, if done by human ear the
entire procedure is only as precise as the individual's ability to
detect the a a absence of low frequency audio signals. So for someone
like me who has been yelled at by kid's, dogs and other assorted life
forms for 63 years the theoretical may be a bit of a moot point?
On May 29, 2018 6:58 PM, "Jerry Gaffke via Groups.Io" <jgaffke=
[email protected]> wrote:
I have no idea what the various software releases for the uBitx are
doing. But during calibration, the BFO should be placed in the center
of the 12mhz crystal filter
so a zero beat can be heard.
Also, the accuracy of that zero beat is proportional to the frequency
of the signal.
So a zero beat to WWV at 15mhz is 15 times more accurate than a zero
beat of a 1.0mhz AM broadcast station.
The three local oscillators are each a strict ratio of the 25mhz
reference, and from post 44515
the operating frequency of a stock uBitx in LSB mode is: vfo -
(clk1-bfo)
By the distributive law of algebra, a 100ppm change in vfo, clk1 and
bfo will result in a 100ppm change in the operating frequency.
Jerry
I have used an analog voltmeter on the speaker leads to watch the beat tone. You just watch the meter move as you tune toward zero-beat. It will move up and down at a slower and slower pace. You can get pretty darn close to zero-beat this way. The biggest problem is that the SSB filter causes a drop-off at the lower frequencies making the beat tone disappear. You kind of have to interpolate even with the meter. If you have a third receiver you might be able to transmit a CW signal from the ubitx against a strong external signal that is a known frequency and use the 3rd receiver to listen to the beat tone between the external signal and your ubitx. You can tell just how far your calibration is off in that manner. In fact that is kind of what the "spot" function on many older transmitters was for. You could "zero-beat" your transmitter using a low-power output against a station you wanted to talk to. tim ab0wr On Tue, May 29, 2018 at 03:38 pm, Glenn Anderson wrote:
When tuning in an AM station when your rig is listening on SSB, you
will hear a carrier tone... This will vary depending on whether you
change your frequency up or down... When you tune so that the
frequency you hear gets so low that it "disappears" then you have
"zero-beated" on the station... Most commercial rigs have a tune
button that typically is at every 25 or 100 khz on the dial...
Once you no longer hear the tone then that's when you calibrate your
dial... A good frequency on air is WWV @ 10.000Mhz...
I hope that helps,
Glenn VE3JAU
|
Re: looking for a ubitx board
Hi Richard, Are you interested in selling that burned up board?? I am looking for something else to experiment with.? I would be interested in the board and Raduino.
Please let me know if you are interested in selling it.
Thanks
Marco - KG5PRT
On Thu, May 31, 2018 at 9:05 AM, Richard E Neese <kb3vgw@...> wrote: My ubitx got hit by a power surge and I am looking for a board locally before ordering from hfsignals. SO if you have a ubitx unbuilt and willing to part let me know.
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Re: SDR as Waterfall display
This mod works great!.? ?I have been using it with a similar upconverter / dongle with the? SDR software? for several weeks--- works very well...
The tap? / place Gregory found is perfect and? ?the pictures he has taken to show exactly where to hookup made it a very easy mod...
So far it? has protected my sdr rx hardware -??My current ubitx tx outputs? range from 15 watts on 80, around 12 watts and? 10 on 20 mtrs .
Thanks Gregory!!
Joe VE1BWV
On Wed, May 30, 2018 at 10:46 PM, K9HZ <bill@...> wrote:
So I¡¯ve actually done this¡ I used this SDR:? ?? which tunes down to 24 MHz.? I tapped into the uBITx IF at TP14 on the rev4 schematic¡ before the 45 MHz roofing filter so the IF spectrum is still wide banded¡ used a 5pf cap as not to load the IF.? I ran that into an IF amplifier made from a MC1350P circuit for 45 MHz right out of the app note.? The response from 1-30 MHz is not flat, so I took an analog pin from the Arduino to set the AGC on the MC1350P and developed a table that generates an AGC voltage for each band as selected that is calibrated basis a known input signal to give dBm on the waterfall.? The software I used for the spectrum display is Freq-show from here: .? It works very well.? I will post a video when my ubitx is back together (currently adding¡ yes¡ a ¡°second¡± receiver¡ ohhhhh!).? I¡¯m not an expert coder, but once this Python app can be coded into the Teensy, I think we have an all-in-one solution!
?
?
Dr. William J. Schmidt - K9HZ
?
From: [email protected] [mailto:[email protected]] On Behalf Of Ralph Mowery
Sent: Wednesday, May 30, 2018 2:43 PM
To: [email protected]
Subject: Re: [BITX20] SDR as Waterfall display
?
I have not tried it,but from the circuit description the first conversion is at 45 MHz.? I would try laying a short insulated wire near Q10.? You may even be able to tap off the emitter of q12 with a low value capacitor.?
Then tune the SDR ( I assume we are talking the about $ 15 TV dongle, but does not matter)? to around 45 MHz.??
There may be more out now, but the two that I bought a number of years ago, one goes from about 25 MHz up and the other starts at 50 some MHz.
?
?
On Wed, May 30, 2018 at 3:06 PM, brad martin <emclinux@...> wrote:
I noticed that the CEC firmware has an SDR mode but this seems to be where the audio as as well are transmitted to the SDR and handled there.? Seems to be a good method for digital or recording but is there a way to just use the SDR as a waterfall display and still have the radio function as normal (i.e. have audio come out the radio speakers)?
?
|
Re: What does zero-beat sound like?
#ubitx
The 30x improvement by calibrating at 30mhz vs calibrating at 1mhz is not theoretical,
even if your hearing is shot.
Instead of looking for a 10hz change in tone, you are looking for a 300hz change.
The ideal might be to monitor the audio from a Nano analog pin, have it look?
for either zero-beat or a specific tone.? Especially for those like me who are tone deaf.
With FFT's on an ARM processor like the Teensy, could discriminate the carrier from
the audio tones on WWV.
toggle quoted message
Show quoted text
On Thu, May 31, 2018 at 08:02 am, Mike aka KC2WVB wrote:
?It seems to me to be without question that if one were to allign/adjust/tune an oscillator to a precise frequency by listening for a zero beat with respect to a known reference frequency that the higher the reference frequency the greater the accuracy with respect to alignment of the oscillator. However, if done by human ear the entire procedure is only as precise as the individual's ability to detect the a a absence of low frequency audio signals. So for someone like me who has been yelled at by kid's, dogs and other assorted life forms for 63 years the theoretical may be a bit of a moot point?
|
Re: What does zero-beat sound like?
#ubitx
Just a thought: ?It seems to me to be without question that if one were to allign/adjust/tune an oscillator to a precise frequency by listening for a zero beat with respect to a known reference frequency that the higher the reference frequency the greater the accuracy with respect to alignment of the oscillator. However, if done by human ear the entire procedure is only as precise as the individual's ability to detect the a a absence of low frequency audio signals. So for someone like me who has been yelled at by kid's, dogs and other assorted life forms for 63 years the theoretical may be a bit of a moot point?
On May 29, 2018 6:58 PM, "Jerry Gaffke via Groups.Io" <jgaffke= [email protected]> wrote: I have no idea what the various software releases for the uBitx are doing.
But during calibration, the BFO should be placed in the center of the 12mhz crystal filter?
so a zero beat can be heard.
Also, the accuracy of that zero beat is proportional to the frequency of the signal.
So a zero beat to WWV at 15mhz is 15 times more accurate than a zero beat of a 1.0mhz AM broadcast station.
The three local oscillators are each a strict ratio of the 25mhz reference,? ?and from post 44515
the operating frequency of a stock uBitx in LSB mode is:? ? vfo - (clk1-bfo)?
By the distributive law of algebra, a 100ppm change in vfo, clk1 and bfo will result in a 100ppm change in the operating frequency.
JerryOn Tue, May 29, 2018 at 03:38 pm, Glenn Anderson wrote:
When tuning in an AM station when your rig is listening on SSB, you will hear a carrier tone... This will vary depending on whether you change your frequency up or down... When you tune so that the frequency you hear gets so low that it "disappears" then you have "zero-beated" on the station... Most commercial rigs have a tune button that typically is at every 25 or 100 khz on the dial...
Once you no longer hear the tone then that's when you calibrate your dial... A good frequency on air is WWV @ 10.000Mhz...
I hope that helps,
Glenn VE3JAU
|
Re: Heat proofing the ubitx.
Very nice.? This is another reason for me to get a 3d printer.? Which kind is yours??? I posted this picture before of my temperature controlled variable 20mm fan.? Not much spare room in my case which is why the fan and filter are on the outside. -- Lee - N9LO? "I Void Warranties"
?
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Re: ubitx assembly confusion, help needed
See attached photo for the pin connections on the molded-plastic 3.5 mm jacks.
--
Jon Titus, KZ1G
Herriman, UT USA
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Re: The new uBITX boards are here
Well this jogged my memory when I used 21 figure logs and 15 figure Sine tables . Both books about 3" thick. Cosines and tangents are calculated from the Sine tables using trig functions.
The 'calculator' was a dual hand cranked machine with both halves coupled for 28 SF.
Was in Civil engineering and setting starting points from distant trig points.?
Peter Paul Fox G8HAV
Mid-Cheshire Amateur Radio Society
5 Llandovery Close
Winsford
Cheshire CW7 1NA?
Group Controller
Dane Valley?RAYNET?
Tel: 01606553401 (H)
Tel: 07919315547 (M)
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Show quoted text
lovely recollection of my 1st job doing optical design by using? BIG "BIBLE" LIKE 7 FIGURE LO AND SINE COSINE ETC BOOK -- WAY BACK IN 1964-65
?Thaniks Kevin
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Re: Need Clarification on uBitx v. 4 Schematic
In answer to Mike's question, the RD15*/RD16* parts are an alternative to the IRF510's.
But they are not magical, just stuffing them into the uBitx will not improve things by much,
there are a number of mods required to make good use of them.?
And considerably more mods required to address the issue of getting sufficient gain
at 30mhz from the preceding? 2n3904 stages.??
I suggest waiting for Allison and others to arrive at a good recipe?
before blindly butchering boards.
Jerry
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Show quoted text
On Wed, May 30, 2018 at 10:27 pm, Mvs Sarma wrote:
i suppose that RD16HHF1 are to be used.? Some people experiment with RD15HVF1 too. They feel that 21 and 28 mhz performance would improve.
but you might suffer poor performance at 80m band etc
?
. . .
?
On Thu, May 31, 2018 at 9:50 AM, Mike <msmith@...> wrote:
Regarding the new version 4 schematic:
Do new components Q942 and Q952 connect in parallel with the IRF510's as per schematic or
are?the RD15HV's meant to be used as an?alternative to the IRF510's?
Thanks,
Mike
|
K9HZ
Jim Sheldon
Lee
