Date   
Re: My first measurements with relay daughterboard

Gordon Gibby
 

It’s on git hub, I will have to look around to find where I left it.   


On Jun 19, 2019, at 14:29, Curt via Groups.Io <wb8yyy@...> wrote:

Mark

its out there on some site that hosts this info (you might find it before Gordon answers it) - our club group build used the artwork to order a batch - they work - cure the CW spurs - not to dreadful to install except I used mini coax and that makes for some fun when you make them a bit too long. 

yes some uBITX accessory supplier (on each continent maybe) SHOULD supply this board and the parts - too much burden in a 1-2 piece order.  its a nice solution for v3 and v4 that need it. 

Curt

Re: VK4PP Ultimate uBitx Daughter Board. #ubitx #filters #parts

Evan Hand
 

Nick,

Put me down for 2 boards.

thanks and 73
Evan
AC9TU

Re: My first measurements with relay daughterboard

Curt
 

Mark

its out there on some site that hosts this info (you might find it before Gordon answers it) - our club group build used the artwork to order a batch - they work - cure the CW spurs - not to dreadful to install except I used mini coax and that makes for some fun when you make them a bit too long. 

yes some uBITX accessory supplier (on each continent maybe) SHOULD supply this board and the parts - too much burden in a 1-2 piece order.  its a nice solution for v3 and v4 that need it. 

Curt

Re: V5 - Nextion Screen not work but very little ?

chuckr@hostu.org
 

Hi Ted,  Thanks for all the help you gave. I finally have solved the problem. Thinking the blue and yellow wires were the transmit and receive lines I checked them with the old trusty DVM and sure enough the blue wire or connection on the screen was reading about 2 ohms to ground, should have been closer to 2.5 meg ohms. Swapped out with my cracked test screen and the functions below the crack worked, and verified the 2.5 meg ohm reading on this screen. Wounder about warranty in china???? :)
chuck 73

Re: My first measurements with relay daughterboard

Mark Hatch
 

Gordon,

At one point you made the Gerber files available? Seem to remember seeing them somewhere.

I assume no one has actually made the boards and are selling them? (hint kit-projects.com or amateruradiokits.in...)

73
Mark
AJ6CU

Re: V5 - Nextion Screen not work but very little ?

Sam Tedesco
 

I'm not quite sure which version of the tft you got. Could you search "Ted" and download the tft from there? I think Ted made a few personalized adjustments, but it looks complete to me. Also, are you sure you have the enhanced nextion and not the basic?

Re: My first measurements with relay daughterboard

Gordon Gibby
 

Yes kees— finally got a chance to test it on real equipment.   Confirmed what I had found with the S meter measurements and then some


On Jun 19, 2019, at 10:57, Kees T <windy10605@...> wrote:

Gordon,

I assume this reflects your "External Relay Daughterboard" dated 8/12/2018.

Sure is nice to have access to a good Spectrum Analyzer, isn't it.

73 Kees K5BCQ

LTSpice - uBITX

Ravi Miranda
 

Hi,

I'm not an expert on LTSpice, but before I go down that route, is
there any LTSpice file for a uBITX.

I did look in the messages and files section and came up with bits and
pieces of sections.

Is there anything more complete?

Many thanks,

Ravi/M0RVI

--
I'm here to add more value to the world than I'm using up.

Re: My first measurements with relay daughterboard

Kees T
 

Gordon,

I assume this reflects your "External Relay Daughterboard" dated 8/12/2018.

Sure is nice to have access to a good Spectrum Analyzer, isn't it.

73 Kees K5BCQ

Re: Can't calibrate new uBitx - why? #calibration #ubitx

neil@...
 

Evan,

Bingo! Thank you so much for that link and comment.

I can imagine that the cryptic message might have been a truncated version of something like "[tune vfo] to exactly 10 MH press PTT & turn [off settings]" which seems to fit the procedure.

My radio was also off by about 1.5 kHz, as mentioned in the linked thread (which is from 3 months ago), so it looks like they maybe have a mis-calibrated standard back at their test/production facility.

73,
Neil
KX2Y

Re: My first measurements with relay daughterboard

Gordon Gibby
 

I was able to make measurements on the 20 meter version 3 uBitx harmonics, using the daughterboard relay system, even with 1 section of the filter missing due to damage i caused when installing it.   The 20 meter fundamental is several dB lower than the 80 meter fundamental, so the "blue line" would actually have to be a the same number of dB lower....but as you can see, the 20 meter harmonics are no where close to the FCC limit. 


adding the external daughterboard appears to have completely cleaned up the harmonics on these bands for my version 3 board.   Now I can pursue doing FT8 and JS8 with a very clean conscience on any of these bands.     I have several uBitx's that I've accumulated and may well grab a version 5 at some point now that we've realized the relay power within JS8call -- and at some point I'll redesign that daughterboard gerber file so that it uses the cheaper relays, which need the coil current going the opposite direction.     ​  I'll also update the construction documents on github with spectrum analyzer photos.   going to try and get the top of the fundamentals more visible in these plots...need a little more tweaking of the spectrum analyzer to make it show them  


fantastic little rig.   Lots of things to improve upon, but what a great education it has done for me!   Now that I have a spectrum analyzer, we may be using these rigs in upcoming General and Extra class license classes so people can SEE the mixing, modulating, and demodulating.



Gordon





From: BITX20@groups.io <BITX20@groups.io> on behalf of Gordon Gibby <ggibby@...>
Sent: Tuesday, June 18, 2019 9:56 PM
To: BITX20@groups.io
Subject: [BITX20] My first measurements with relay daughterboard
 

I finally sat down to do some more work on my uBitx -- with the external relay daughterboard -- wired with just regular, unshielded wire.   I recall that I damaged and lost one section of one of the low pass filters (I think on 20 meters).


Here attached is the first plot I got attempting to look at the CW harmonics on 80/40/30 meters, using a 12V supply.   I had 67 dB of pads in line with the Siglent spectrum analyzer, and that entered as a correction factor.   Video and RBW were 30 kHz.   Frequencies are from 3-63 MHz so each major division is 6 MHz.   using "traces" with an averaging of 2, I was able to capture and hold traces of 80, 40 and 30 meter CW signals.   You can figure them out from the frequencies, but 

80 meters = purple

40 meters = yellow

30 meters = blue 


The blue horizontal line is my attempt to mark the FCC limit requirement for harmonics, 43 dB below an observed output of about 37 dBm.     


If I should make this measurement differently, I'm quite willing to hear improvements!  This was my first crack at it, and I've only had the spectrum analyzer for 2 months.   It has been used on MANY projects already.    


I believe you can see that the harmonics are WELL below the limit for these items tested.


I'll work at this some more and hopefully made more and better measurements.




Re: Can't calibrate new uBitx - why? #calibration #ubitx

MVS Sarma
 

Yes. I get you. Thanks. Perhaps the new method i saw on the same site, but as I went thro' hf signals  ubitx site to day, this is what I found.
 Perhaps Farhan  may have to relocate the relevant section .

Regards
sarma
 vu3zmv

Re: Can't calibrate new uBitx - why? #calibration #ubitx

Vic WA4THR
 

That calibration method is what was used before version 5.1 of the uBitX sketch, and still applies if you are using the KD8CEC sketch which just duplicated the old method. However, it is not correct for the current OEM program where calibration puts the rig into transmit.

=Vic=

Re: Can't calibrate new uBitx - why? #calibration #ubitx

MVS Sarma
 

Evan, I saw the details. Ashar Farhan says to tune to a Shortwave AM station  and adjust "calibrate for  soc alled zero beat, and later select an SSB signal for loudness (not clairy.)
 Then fine tune  using BFO
Here is a .docx copy of the set of instructions. for ready reference.



On Wed, Jun 19, 2019 at 12:01 PM Evan Hand <elhandjr@...> wrote:
Check on this thread, as the calibration procedure changed from the v4 to v5 software.

https://groups.io/g/BITX20/topic/30236125

Note that the new process with HFSignals' firmware does go into transmit mode, and that you need a receiver and a dummy load (or else antenna) connected to the uBitx.  Then zero beat the signal against the other receiver tuned to 10 MHz.

So what you are describing is normal operation as supplied by HFSignals

73 and enjoy!
Evan
AC9TU

Re: Can't calibrate new uBitx - why? #calibration #ubitx

Evan Hand
 

Check on this thread, as the calibration procedure changed from the v4 to v5 software.

https://groups.io/g/BITX20/topic/30236125

Note that the new process with HFSignals' firmware does go into transmit mode, and that you need a receiver and a dummy load (or else antenna) connected to the uBitx.  Then zero beat the signal against the other receiver tuned to 10 MHz.

So what you are describing is normal operation as supplied by HFSignals

73 and enjoy!
Evan
AC9TU

Re: V5 - Nextion Screen not work but very little ?

chuckr@hostu.org
 

Wiring as you stated. Please more thoughts,,
thanks so much

chuck

Re: Can't calibrate new uBitx - why? #calibration #ubitx

neil@...
 

On Tue, Jun 18, 2019 at 06:55 PM, Curt wrote:
k3pzn ubitx
Thanks for that, Curt. The N3SB article looks promising.

Neil, KX2Y

Re: Kit-Projects AGC volume high

KE2GKB
 

Not a problem happy to hear of another happy install! 73

-- Tim Keller - KE2GKB https://shop.kit-projects.com

My first measurements with relay daughterboard

Gordon Gibby
 

I finally sat down to do some more work on my uBitx -- with the external relay daughterboard -- wired with just regular, unshielded wire.   I recall that I damaged and lost one section of one of the low pass filters (I think on 20 meters).


Here attached is the first plot I got attempting to look at the CW harmonics on 80/40/30 meters, using a 12V supply.   I had 67 dB of pads in line with the Siglent spectrum analyzer, and that entered as a correction factor.   Video and RBW were 30 kHz.   Frequencies are from 3-63 MHz so each major division is 6 MHz.   using "traces" with an averaging of 2, I was able to capture and hold traces of 80, 40 and 30 meter CW signals.   You can figure them out from the frequencies, but 

80 meters = purple

40 meters = yellow

30 meters = blue 


The blue horizontal line is my attempt to mark the FCC limit requirement for harmonics, 43 dB below an observed output of about 37 dBm.     


If I should make this measurement differently, I'm quite willing to hear improvements!  This was my first crack at it, and I've only had the spectrum analyzer for 2 months.   It has been used on MANY projects already.    


I believe you can see that the harmonics are WELL below the limit for these items tested.


I'll work at this some more and hopefully made more and better measurements.




Re: Can't calibrate new uBitx - why? #calibration #ubitx

Curt
 

Frequency calibration acts strange. Use search engine to find k3pzn ubitx page. Then look for calibration article by n3sb.

Curt