Re: Wow... 15 volts in and a bunch out..
You're referring to the regulator on the Randuino? ?I'm considering adding a resistor to cool the 7805.?
Measure the voltage ACROSS the resistor and the input to the 7805 to ground and report back.
Surprised a 1/4w worked.
I guess this needs to be done for both versions, the one with the LCD display and without with the Nextion display.
Thanks Bo W4GHV?
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Re: Nextion 3.2 for CEC 1.097
#ubitx
I may or may not do a 3.5" version.? It's a lot of work as you have to change every element on every page.? It would be nice if there was a way to easily scale it to different size screens, but you basically end up remaking it for each screen size.? Plus I don't have a 3.5" screen and although the editor does give you a good idea how things look and function, it's still not as good as having an actual screen.
Darren VE3XLT
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New stuff from W0EB/W2CTX/N5IB "Triumvirate Skonk Worx"
#ubitx
Those of you that already have or are interested in our BITeensio (Teensy 3.6 MPU) card for the uBITX take a look at the "TSW" website, and you will see a preview of some things to come.? The Color TFT display shown is NOT a Nextion as we abandoned attempts to use the Nextion display.? Unfortunately the Nextion and it's editor are "Single Source" meaning you can get it (mainly the editor as there are closes of the display) from only ONE place.? Not so with the ILI9341 based TFT Color Displays and also the larger RA8875 based displays for which a 5" one is the next project being worked on.
The finishing touches are being tweaked for the 2.8" version shown installed in one of my uBITX radios on the website.? A small wireless keyboard turns out to be a nice addition as you can control the radio completely from the KB and you have the added benefit of a built in Keyboard type CW keyer.? You can also use a plug-in USB keyboard as long as you don't use a lighted one as the lighted keyboards draw too much current from the Teensy's on-board USB hotst power supply./
Jim Sheldon, W0EB
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On Thu, Aug 23, 2018 at 09:55 AM, Jerry Gaffke wrote:
If that trace between the relays for rx is not grounded during transmit, it will carry enough RF energy
to create a really impressive oscillator.
Thanks, Jerry.? That's what I was thinking. I probably need to build a little RF probe and follow the transmit path to find the problem.
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Re: Wow... 15 volts in and a bunch out..
I guess I'm old school. ?Or one reluctant to complain.
If it's cheap and WORKS, DON'T 'FIX'IT! ? Period.
If it's expensive and has problems, RETURN it. Period.
If you like to modify it, have at it, AND DON'T COMPLAIN!?
If you get a violation notice, get a new radio, don't complain.
I'm happily using one and just tinkering with another just to refresh my memory from long ago when I was an 'expert' according to some.
Grateful to Farhan for this innovative toy radio (that is as sensitive as my Icom 7300) and that I could afford TWO of them.
?
Note on the 15v mod. I've ordered a mean well supply adjustable from 13.8 to 15 for under $20. Stay tuned for a report.
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There's an awful lot of gain between Q90 and the IRF510's.
If that trace between the relays for rx is not grounded during transmit, it will carry enough RF energy
to create a really impressive oscillator.
Unfortunately, it won't necessarily be at the operating frequency.
Jerry, KE7ER
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On Thu, Aug 23, 2018 at 07:04 AM, Arvo W0VRA wrote:
In transmit, the trace between K3 pin 14 and K1 pin 12 is disconnected from the antenna at K3 and connected to ground at K1.? What is the designer's intention for doing that?? Wouldn't disconnecting the trace from the antenna be enough?
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I will do this the next time I can get to our latest an greatest
R&S FSWP in my QRL
Henning Weddig
DK5LV
Am 23.08.2018 um 15:56 schrieb iz oos:
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Has anybody measured the actual phase noise of the uBitx?
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In transmit, the trace between K3 pin 14 and K1 pin 12 is disconnected from the antenna at K3 and connected to ground at K1.? What is the designer's intention for doing that?? Wouldn't disconnecting the trace from the antenna be enough?
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Re: Intermodulation Performance
David,? the web page has a wiki...
Maybe the mods could harvest info and post there or borrow from mike at ubitx.net.
Allison
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Has anybody measured the actual phase noise of the uBitx?
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SI5351 with output xfrormers
I am looking for a ready built SI5351 board, with isolating transformers.
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If you haven't installed a cap on the output of the DSP audio filter I suggest doing so. Without it I had a lot of strange things going on with my audio as I believe that there is DC voltage present on the output that was messing with the audio amp.
Michael VE3WMB
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Re: Intermodulation Performance
Sarma
Thank you for the great suggestion. This design is not from me. It is the work of?Kees K5BCQ. I agree...... a very nice job and I look forward to testing it.
Warren - WA8TOD
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Re: Nextion 3.2 for CEC 1.097
#ubitx
Hi Darren, VE3XLT
Can you please make this correction to? CEC 1.097 Nextion screen for my basic 3.5" (tft) display?
TA2FU Alper?
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Re: Loud sound on first power-up
#ubitx
On key down it should well over 2A.
Il 23/ago/2018 08:16, < micah@...> ha scritto: Still working on this. Speaker and audio out jack are wired correctly. So's the pot. It's supposed to be 10K right?
I have both a paddle and straight key jack wired up according to
The overall box draws about 500ma upon power up (with loud buzz from the speaker). That seems a bit high. There's nothing going out the antenna jack. What's the nominal value?
When I depress a straight key (plugged in to the key jack, so bringing the KEYER line straight to ground) the buzzing either stops or pulsates, like the internal keyer is doing its thing. Current consumption goes over 1A and I am seeing power going out the antenna. So that's good, I guess. I measure 5 volts on the KEYER line when nothing's pressed, so the 4.7k pull-up is working.
Could it be RF getting loose and feeding into the audio front end?
My LCD appears blank on the top line, and a series of fully-filled-in rectangles on the bottom line, no matter how I twiddle the trimmer on the back of the Raduino. Is that indicative of some wider problem?
Thanks for your troubleshooting brainstorming thoughts. :)
73,
MIcah AJ6BD
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Re: Loud sound on first power-up
#ubitx
Still working on this. Speaker and audio out jack are wired correctly. So's the pot. It's supposed to be 10K right?
I have both a paddle and straight key jack wired up according to
https://ubitx.net/wiring-up-a-paddle-and-straight-key/
The overall box draws about 500ma upon power up (with loud buzz from the speaker). That seems a bit high. There's nothing going out the antenna jack. What's the nominal value?
When I depress a straight key (plugged in to the key jack, so bringing the KEYER line straight to ground) the buzzing either stops or pulsates, like the internal keyer is doing its thing. Current consumption goes over 1A and I am seeing power going out the antenna. So that's good, I guess. I measure 5 volts on the KEYER line when nothing's pressed, so the 4.7k pull-up is working.
Could it be RF getting loose and feeding into the audio front end?
My LCD appears blank on the top line, and a series of fully-filled-in rectangles on the bottom line, no matter how I twiddle the trimmer on the back of the Raduino. Is that indicative of some wider problem?
Thanks for your troubleshooting brainstorming thoughts. :)
73,
MIcah AJ6BD
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Re: Intermodulation Performance
Warren, ?Thanks for nice job. We never get these vertical type relays. The filter caps may be? 3? for each section, ? so that the user? could reach closer value of capacvcitor by a combination. regards ?sarma
?vu3zmv
On Wed, Aug 22, 2018 at 11:37 PM Warren Allgyer < allgyer@...> wrote: Hi Kees
I would be honored to test and record data, publish if you wish, any filters you would be willing to send. I would of course return them after testing is complete. If you would like to proceed please contact me privately for shipping info.?
Thank you Kees.?
WA8TOD
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Re: Intermodulation Performance
Allison: ? No, I have been around, just too busy to keep up with all the threads. I wish there was a ¡°Status¡± page that could keep everybody posted on progress. ? Thanks, ? David A Posthuma, WD8PUO ?
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From: [email protected] <[email protected]> On Behalf Of ajparent1/KB1GMX
Sent: Wednesday, August 22, 2018 10:25 PM
To: [email protected]
Subject: Re: [BITX20] Intermodulation Performance ? David,
You must have missed the last three months.... and a pair of very long threads!? ;)
To clean that up yes, band pass filters are the option or some very fancy combination of
high pass and low pass which results in the same pass band as a band pass.
Generally the in band spurs happen to be extremely weak and as such not a worry
other than being annoying on receive.
Allison
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On Wed, Aug 22, 2018 at 09:16 PM, ajparent1/KB1GMX wrote:
K1 talks to K3 for Rf path.
The 12VDC side of K1 is successfully telling K3 what to do.? If K3 is not listening and is stuck in receive, then the transmit RF from the PA will dead end in K3 and the PA transistors will get hot.? They are not getting hot, so I don't think K3 is sticky. Apologies if I did not make it clear that the 12VDC control signals from K1 all appear to be working correctly on TX and RX.
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Re: Intermodulation Performance
David,
You must have missed the last three months.... and a pair of very long threads!? ;)
To clean that up yes, band pass filters are the option or some very fancy combination of
high pass and low pass which results in the same pass band as a band pass.
Generally the in band spurs happen to be extremely weak and as such not a worry
other than being annoying on receive.
Allison
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Darren VE3XLT
Jim Sheldon
Arvo W0VRA
TA2FU
David Posthuma