Date   
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

V4 Raduino

Dennis Yancey
 

I have a v4 Raduino for sale. Very lightly used, it has the CEC software loaded on it presently, came with the 4.3 originally. Thief is excess to my needs. $37.50 shipped to CONUS and PayPal fees. 
--
72 and God bless
KD4EPG

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

Re: Kit-Projects AGC volume high

Joel Trenalone
 

Ah yes, I missed that will do,
thanks for your help :)

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

Sam Tedesco
 

Black, red, none, blue, none, yellow?

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

Sam Tedesco
 

Wiring? First 6 pins, left to right of the display plug?

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

neil@...
 

I just finished assembling a uBitx. The display shows "ver 5.1" for the firmware. On first trials It seems to receive and transmit (with a dummy load) about as you'd expect, but when I tried to touch up the frequency calibration I ran into an odd problem.

When I selected Calibrate from the menu, the screen briefly flashed the cryptic message "to exactly 10 MH press PTT & turn".  That showed for perhaps one second, and then the radio jumped into transmit mode (although I had not touched the PTT button or any other control). It remained in Transmit until I pressed the encoder, which dropped it back into receive mode and returned focus to the menu.

Any ideas? Corrupted firmware? PEBCAK error? Thanks in advance.

Neil, KX2Y

Re: Kit-Projects AGC volume high

KE2GKB
 

I would recommend adding a 10ohm resistor between that just for protection/current limiting on the input to the AGC's amplifier. HOWEVER yes that seems to be the fix for most of the issues we have seen.

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

Re: Kit-Projects AGC volume high

Joel Trenalone
 

I just connected the V pad from the AGC to TP21 in between Q74 and R70 and it seems to be working. The level is constant at this point, and does not vary with the volume pot....

Re: Kit-Projects AGC volume high

Joel Trenalone
 

That’s what I thought. The point between V high and r70 should be constant, and not vary with the volume pot.....but when I put my oscope on that point he audio level is varying when I adjust the volume.......I’ll have to think here :)

Re: Kit-Projects AGC volume high

KE2GKB
 

The only thing I can think of is that the varying impedance is causing it to allow more current to the AGC circuit. The fix we have been suggesting for the V4 might help here. If you have an ~10ohm resistor and place it BEFORE r70 and wire that to the volume in pad that might fix the issue :)

That said not 100% sure why this is happening we tap before the volume is adjusted for output so unless the voltage drop is that significant I'm not really sure.

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

Kit-Projects AGC volume high

Joel Trenalone
 

Greetings all again :),
I have my V5 running and installed the Kit Projects AGC. It seems to be working for both fast and slow, and I have the S meter running on the Nextion display. 

One thing is confusing me. The S meter is varying with the volume, in other words when I turn the volume down the S meter goes down and visa versu. I have the V point on the AGC hooked to the volume high on the volume pot tab, and when I check the continuity between that point and R70 resistor it checks out as the same point. 

Do do I have something hooked up wrong?
thanks as always for the advice :),
Joel

Re: N6DT AGC and S-meter

Joel Trenalone
 

Never Mind,
was having some problems with x loader, but it worked. S meter working now.