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no output power on 40m and above #ubitx-help

 

i finished building the ubitx with nextion display.theres zero power output in 40m ,20m and above but below 7mhz on all bands i get good output power.measured power with mfj power meter on 30w scale.has anyone else encountered the same issue.how do i proceed with solving this issue?
Re: Help Me Interpret this Spectrum?

 

¿ªÔÆÌåÓý

You're reading it right.? dBm is in reference to a milliwatt (usually at 50 ohms), when you're reading the difference between peaks, you're reading db - the difference between two power (or voltage) measurements.? 3db is a voltage/power drop by about half, 20db is 10x drop (logarithmic scaled).? 40 db would then be 100x (1/10th of 1/10th).? There are tables and programs that give you the voltage (p-p, rms, etc.) converting it to dBm, with the ability to take different resistances into account.? I've got a spreadsheet I use to do that.? You can find both spreadsheets and programs (and websites) that do the conversions.

From what I'm observing, you've got harmonics of your carrier, starting at about 40 db down at the first harmonic, and then about 3db higher for the second (counting from the carrier).? You've got harmonics going up the spectrum... I'd recommend an external filter, as they aren't decreasing in power very much the higher you go.

From what I've read, there are mods and adjustments that can be made, which will improve things considerably.? In the meantime, a few add-on external bandpass filters would be a good idea... would clean up the signal a lot.? For the higher bands (above 20), a strong low-pass cutting off about 35 would not cause too much loss and would keep you perfectly legal.? (If you go with an external amp, a push-pull design that's even remotely decent will prevent even harmonics - the first one (double frequency), the third (4x frequency), and so on.)

On another note...

That instrument you mentioned is really intriguing... I've looked at things like that in the past, but wasn't too thrilled with the limitations (mainly that they would only work on proprietary software and getting spreadsheet-like data out of them was... difficult).? That one looks like it might be different, and the one instrument I could REALLY use is the spectrum analyzer (to 30mhz - I have a dongle that is awesome - and cheap - for above that, although you have to do 'slices' of the spectrum).? With a laptop (or tablet if there is software for android), it would make an awesome portable scope too (for most ham use).

I know Analog Devices quite well, for instance I've built a dBm meter based on their chips - the dBm meter is both super-sensitive and accurate (at least, for my purposes - I could even improve it but don't have the time).? They put out good stuff.

Hope this is helpful for you!

Bob

N4FBZ

On 3/25/19 9:16 AM, ronmhauser via Groups.Io wrote:

Thanks Raj!?

I Forgot to put in first post that this is CW key down, still need to wire up a mic.? For some reason the software for the AD2 puck doesn't have dBm, or maybe I need to update it.? I can already see why more sophisticated instruments let you set reference value 0dB and can put cursors on peaks to read off values.? The board and all the parts are just spread out loose on my bench, so I am sure that I have wiring and shielding issues.? I appreciate the feedback, this is validating my approach.?

Thanks!
--Ron
K0EIA

Re: Black Squares on Raduino Display Redux #bitx40 #raduino

Pat Anderson
 

Thanks, Vic - this looks like just the ticket. I have printed the "Geezer instructions" and will do what I can to follow them!
Re: Black Squares on Raduino Display Redux #bitx40 #raduino

Pat Anderson
 

Punctuation issue (missing period, run-on sentence), repost to clarify.

I spent last evening prowling the Arduino forums unrelated to bitx-40.? The black squares appear on Arduino displays NOT connected to radios as well.? I may have some wiring issues, and I will spend some time checking and rechecking. But the black squares those forums said appear because the Arduino is not being properly initialized. This would indicate a software issue rather than wiring or hardware. I disconnected the the Raduino from the board this morning and powered it up with the USB cable. Nothing appears on the screen but the display lights up. If I knew how to, I would compile and load Allard's plain vanilla sketch for an unmodified out of the box bitx-40. I don't know how to, so I am hoping somebody will point me in the right directioni to do that.?

Thanks for any assistance!
Re: Black Squares on Raduino Display Redux #bitx40 #raduino

Pat Anderson
 

I spent last evening prowling the Arduino forums unrelated to bitx-40.? The black squares appear on Arduino displays NOT connected to radios. as well I may have some wiring issues, and I will spend some time checking and rechecking. But the black squares those forums said appear because the Arduino is not being properly initialized. This would indicate a software issue rather than wiring or hardware. I disconnected the the Raduino from the board this morning and powered it up with the USB cable. Nothing appears on the screen but the display lights up. If I knew how to, I would compile and load Allard's plain vanilla sketch for an unmodified out of the box bitx-40. I don't know how to, so I am hoping somebody will point me in the right directioni to do that.?

Thanks for any assistance!
Re: Help Me Interpret this Spectrum?

 

¿ªÔÆÌåÓý

Ron,

It looks like a correct interpretation to me.? Also I will have to check out the Analog Discovery 2.

Enjoy the V5.

Dan W3BU

?

?

From: [email protected] [mailto:[email protected]] On Behalf Of ronmhauser via Groups.Io
Sent: Monday, March 25, 2019 6:59 AM
To: [email protected]
Subject: [BITX20] Help Me Interpret this Spectrum?

?

Hi everyone.? I am putting together a v5 uBitx, it's my first Bitx and the most complicated thing I have built so far.? I've done some fixes on old tube final Kenwoods which got me interested in what's inside the case, and got me some decent test equipment.? I've been going slow, but my uBitx is now wired up and I'm testing it on a dummy load.? I recently got hold of an Analog Discovery 2, a USB hockey puck which gives a bunch of software test equipment, including a spectrum analyzer.? I have never touched a spectrum analyzer until today, and it took a lot of double checking to confirm I had the right level of attenuation, the right level of signal, termination, etc.? So I need help interpreting these results and I may not have some things set up properly.? I think it is telling me that the third harmonic is attenuated about 38dB (-15 to -53, looks like). What do you see??

73
--Ron
K0EIA
Re: Help Me Interpret this Spectrum?

[email protected]
 

Thanks Raj!?

I Forgot to put in first post that this is CW key down, still need to wire up a mic.? For some reason the software for the AD2 puck doesn't have dBm, or maybe I need to update it.? I can already see why more sophisticated instruments let you set reference value 0dB and can put cursors on peaks to read off values.? The board and all the parts are just spread out loose on my bench, so I am sure that I have wiring and shielding issues.? I appreciate the feedback, this is validating my approach.?

Thanks!
--Ron
K0EIA
Re: LDG Z-817 autotuner

 

My LDG Z-11 Pro is hooked up to my uBitx and it works great
--
Lee - N9LO? "I Void Warranties"

?
Re: LDG Z-817 autotuner

 

Thanks Skip That is what I figured when I initially got powered and couldn't make it go with the PTT. Figured it needed a signal on one of the input wires. but which wire and what flavor. Beyond the scope of plug and play solution. Certainly I am not against your solution. I had thought of wiring in a bank of switches to control the relays. but that seemed so inelegant.
Dave
Re: Help Me Interpret this Spectrum?

 

Forgot to mention, that we generally use dbm.

-------------------------------------------
You are right on the interpretation Ron.

If you are on SSB then reduce the drive pot VR1 to mid way (not full) and increase modulation.
This will improve matters.

Raj

At 25-03-19, you wrote:

Hi everyone.? I am putting together a v5 uBitx, it's my first Bitx and the most complicated thing I have built so far.? I've done some fixes on old tube final Kenwoods which got me interested in what's inside the case, and got me some decent test equipment.? I've been going slow, but my uBitx is now wired up and I'm testing it on a dummy load.? I recently got hold of an Analog Discovery 2, a USB hockey puck which gives a bunch of software test equipment, including a spectrum analyzer.? I have never touched a spectrum analyzer until today, and it took a lot of double checking to confirm I had the right level of attenuation, the right level of signal, termination, etc.? So I need help interpreting these results and I may not have some things set up properly.? I think it is telling me that the third harmonic is attenuated about 38dB (-15 to -53, looks like). What do you see??

73
--Ron
K0EIA


[] ?
Re: Help Me Interpret this Spectrum?

 

You are right on the interpretation Ron.

If you are on SSB then reduce the drive pot VR1 to mid way (not full) and increase modulation.
This will improve matters.

Raj

At 25-03-19, you wrote:

Hi everyone.? I am putting together a v5 uBitx, it's my first Bitx and the most complicated thing I have built so far.? I've done some fixes on old tube final Kenwoods which got me interested in what's inside the case, and got me some decent test equipment.? I've been going slow, but my uBitx is now wired up and I'm testing it on a dummy load.? I recently got hold of an Analog Discovery 2, a USB hockey puck which gives a bunch of software test equipment, including a spectrum analyzer.? I have never touched a spectrum analyzer until today, and it took a lot of double checking to confirm I had the right level of attenuation, the right level of signal, termination, etc.? So I need help interpreting these results and I may not have some things set up properly.? I think it is telling me that the third harmonic is attenuated about 38dB (-15 to -53, looks like). What do you see??

73
--Ron
K0EIA


[] ?
Help Me Interpret this Spectrum?

[email protected]
 

Hi everyone.? I am putting together a v5 uBitx, it's my first Bitx and the most complicated thing I have built so far.? I've done some fixes on old tube final Kenwoods which got me interested in what's inside the case, and got me some decent test equipment.? I've been going slow, but my uBitx is now wired up and I'm testing it on a dummy load.? I recently got hold of an Analog Discovery 2, a USB hockey puck which gives a bunch of software test equipment, including a spectrum analyzer.? I have never touched a spectrum analyzer until today, and it took a lot of double checking to confirm I had the right level of attenuation, the right level of signal, termination, etc.? So I need help interpreting these results and I may not have some things set up properly.? I think it is telling me that the third harmonic is attenuated about 38dB (-15 to -53, looks like). What do you see??

73
--Ron
K0EIA
Re: Black Squares on Raduino Display Redux #bitx40 #raduino

[email protected]
 

I had all black squares on v5 uBitx powerup ... there is a bright/dim pot on the back of the raduino board that had to be adjusted to a suitable level.

73
--Ron
K0EIA
Re: Black Squares on Raduino Display Redux #bitx40 #raduino

 

Is this for a BitX40? First thing to check is the wiring, especially the connectors to the Raduino since current models use a 16 pin header and the BitX40 wiring harness uses smaller plugs. Getting the right pins connected on the 16pin header is important or the unit might be compromised, so the 5 pin plug needs to fit on the 5 pins closest to the blue pot with the yellow lead all the way to the last pin. If the wiring is correct, you can try and adjust the contrast control, that blue pot on the back of the Rauino, to see if it clarifies the display.

Switching to the Amunter code will improve things, and no hardware changes are needed (although a few simple ones will greatly enhance the operation). As for how to program the Raduino, this is a pretty good set of instructions:
/g/BITX20/message/26522?p=,,,20,0,0,0::relevance,,raduino+software+for+geezers,20,2,0,5045944

=Vic=
Re: speaker

 

I would dispense with the amplified speaker idea on the v5 radio, and simply use . They found fine and plenty of audio from the LM386 audio amp of the radio.

73,

Ted
K3RTA

20190309_185824.jpg

speaker

 

On my ubitix v5.1 i use an amplified speaker for pc and all is right.I want to put it in a box and use a 8 ohms speaker but an horrible louder sound appear.I don't know why !
?Thanks for your help.
Re: NEXTION UPDATES FOR 7 AND 5 INCH - --ADAPTED FOR KD8CEC VER 1.095

 

hi
I have searched this thread but can not see the 5" hmi file?
can you post that please
cheers
Matt
Re: Shaking my head in disbelief....

 

Make your own law

I have been making my own law for years!

Geoff - M0OOZ


On Mon, 25 Mar 2019 at 08:34, Kelly Mabry <kmabry2007@...> wrote:
AWESOME!!

Re: uBitx V5 no audio

 

LM386 is 12V and 386-4 is 18V AFAIK.

Just change your chip..

Raj

At 25-03-19, you wrote:
Why no more than 12v power supply???? Is there a specific issue? My Samlex provides around 13.6v
Re: Shaking my head in disbelief....

Kelly Mabry
 

AWESOME!!
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