Date   

PSK 31 not decoding

blakephoto@...
 

Ubitx V4 updated to CEC 1.08 
PSK 31 will not decode in any PSK software  Fldigi,HRD or Digipan  I can decode CW in all 3 ok.
I tried using Easy Digi with or without No difference in either.   I had the same problem with Stock software V4.03 as received new.
 I am using WIN 10 internal soundcard.

Transmit is a little low but  ubixt  seems to work fine.

Any suggestions where to look for problem?
Thanks

Ed Blake


RF Preamp - Attenuator

Woody
 

My uBITX has always been a little deaf (couldn't figure out why) so I built a RX front-end addition.  Also wanted AGC so it became an amplifier followed by an attenuator.   As with prior AGC / RF Gain mods, it inserted in the RX antenna trace (Ripley, et.al.).   As built, it provides a maximum gain of ~ 8 db (+12db from mmic - 4 db from atten) with a 3.5 db NF, which can then be attenuated to more than (about) 50 db down.  Have not measured exactly...   It really wakes up the RX! 
Attenuator Control:  >5 volts for minimum attenuation, approaching zero volts for maximum attenuation (at 22 to 5 ma, depending on attenuation setting).  For manual control would use a potentiometer and voltage follower for current buffer...

I made no attempt to minimize current draw.  It is a bit of a pig, consuming 70 ma + control current (22ma).
Also, no attempt was made to minimize the board physical size...
It uses a MAR3 SM mmic followed by a HSMP-3816 pin diode array attenuator. 

If anyone is interested, I have a to-scale PDF for the board layout, a parts placement image, full resolution schematic, etc.  I can ZIP up a package...


Currently working on an audio derived AGC amp/controller for this thing.  Have it sort of working, but not happy with the performance yet.  Sure would like to have some Plessey SL621C ICs.  I have an ancient homebrew rig that uses one and it is great! 
So far, It looks like this:


 
73,
Woody
--


Re: LSB signal looking more like AM

joshuaclough@...
 

Mine has a diode where that is supposed to be.


Re: Ashhar Farhan #ubitx

Lee
 

I now understand I should swap out the relays but there is still part of my original question.

I asked if there are any mods that need to be done to the current version you are shipping

Is there a list somewhere or or is the rest of the V4 ready to use?

Thanks in advance.
--
Lee - N9LO  "I Void Warranties"

 


Tuning MBITX

will.benn@...
 

1) When we followed Tune up instructions for adjustment of the Power Amplifier Bias - All currents measure ok by instructions up until speaking into microphone, the current did not increase as per instructions, Can you help?
2) Audio output extremely low?
3) 10k and 2.2k resistors in parts list not mentioned in wire up diagram, where do they go can you help?

Regards
Will Bennett VK4WBX


Re: Ubitx will not tune.

Daimon Tilley <daimontilley@...>
 

When I had the same problem changing the encoder fixed it. Good luck!


On 12 Dec 2018, at 00:44, "wayne.k9qo@..." <wayne.k9qo@...> wrote:

I have completed my new ubitx and it will not tune. I have checked the messages here for this problem and have followed some of the others suggestions by installing the new CEC software. On power up, the display shows 7150khz. Turning the encoder in either direction does not change the frequency. I have checked the encoder and I get the 5V to 0V transitions on ENC A and ENC B. pressing the encoder knob in, I get the "set tune step?" however, I am unable to make any changes. Transmit and receive seem to be functioning OK on the 7150khz frequency that is displayed. HELP???


Re: JackAl display delivery times #ubitx

Barry Mayson
 

Hi I concur with Jack about capacitive screens being less precise. I have a tablet with capacitive screen it it some times jumps to conclusions with out me touching it. I have also noticed it doesn't like RF but that may be just mine. Anyway eagerly awaiting the boards. Many thanks for the work and effort put in to the designers and testers.

Barry 


FS: uBITX #ubitx

Dan Reynolds
 

For Sale: first run uBITX. Never powered up. Including lots and lots of extras: USB extension cable to have a socket on the outside of your case. 3D printed knobs - pot & encoder and LCD bezel (all in black filament), Sunhil's accy. kits - AGC kit, LED Meter kit, and audio mute kit. Also have the two K5BCU kits, plus including a 4SQRP HI-PER-MITE CW filter kit (none of the kits have been built. Also including a blue as well as the green LCD. Asking $125 - includes Priority Mail flat rate padded envelope - ONLY IN USA. Sorry. 
Please email me off line. I will not respond to the group. Oh, I still have the original plastic box it came in also. 

I never got around to building it and would like to sell the whole to someone at a good price.
PayPal only (friends & family - or pay my fees).
Thanks.
--
Dan Reynolds -- KB9JLO
<><


Re: Ubitx will not tune.

MVS Sarma
 

try to clear the memory locations before loading stock firmware, once you had used cec firmware.. thereis one .ino that clears eeprom locations.
regards
sarma  vu3zmv

On Wed, 12 Dec 2018 8:53 AM d balfour <davesters@... wrote:
Have you tried it with the stock firmware? When I rebuilt the last one with the last 1.1version, The display locked up until I went back to 1.08 cec firmware with the stock display and it came alive again. The 1.1 version seems to like the nextion display. Before you start changing things start from ground zero.






Re: Ubitx will not tune.

_Dave_ AD0B
 

Have you tried it with the stock firmware? When I rebuilt the last one with the last 1.1version, The display locked up until I went back to 1.08 cec firmware with the stock display and it came alive again. The 1.1 version seems to like the nextion display. Before you start changing things start from ground zero.


Re: Ubitx will not tune.

Clark Martin
 

Make sure they aren’t shorted together.  Check the encoder inputs then turn the knob a minimal amount and check them again, only one should have changed.


Clark Martin
KK6ISP

On Dec 11, 2018, at 6:33 PM, wayne.k9qo@... wrote:

Checked encoder signals at the connector on the cpu board. The correct 5v to 0v transitions are there.


Re: Ubitx will not tune.

wayne.k9qo@...
 

Checked encoder signals at the connector on the cpu board. The correct 5v to 0v transitions are there.


Re: Ubitx will not tune.

wayne.k9qo@...
 

There is no lock symbol on display, but powered down and back on. Without doing anything else, I tried to tune and it would not tune.


Re: Ubitx will not tune.

Woody
 

Good thought...  That feature "got" me for a minute when it first happened.
Power off reset should fix...
Woody

On 12/12/2018 1:00, d balfour wrote:
If you hold the function button down for a couple of seconds it locks the frequency. Per chance did you do that? There is a small lock symbol on the display.


Re: Ubitx will not tune.

Woody
 

Did you / Can you check for voltage transition at the Raduino pins 7 & 8?   If not present there, look at the wiring to the encoder.  If present on 6 & 7, sounds like a Raduino problem (maybe ;) 
Woody - KZ4AK


On 12/12/2018 0:44, wayne.k9qo@... wrote:
I have completed my new ubitx and it will not tune. I have checked the messages here for this problem and have followed some of the others suggestions by installing the new CEC software. On power up, the display shows 7150khz. Turning the encoder in either direction does not change the frequency. I have checked the encoder and I get the 5V to 0V transitions on ENC A and ENC B. pressing the encoder knob in, I get the "set tune step?" however, I am unable to make any changes. Transmit and receive seem to be functioning OK on the 7150khz frequency that is displayed. HELP???
_._,_._,_




--


Re: Ubitx will not tune.

_Dave_ AD0B
 

If you hold the function button down for a couple of seconds it locks the frequency. Per chance did you do that? There is a small lock symbol on the display.


Ubitx will not tune.

wayne.k9qo@...
 

I have completed my new ubitx and it will not tune. I have checked the messages here for this problem and have followed some of the others suggestions by installing the new CEC software. On power up, the display shows 7150khz. Turning the encoder in either direction does not change the frequency. I have checked the encoder and I get the 5V to 0V transitions on ENC A and ENC B. pressing the encoder knob in, I get the "set tune step?" however, I am unable to make any changes. Transmit and receive seem to be functioning OK on the 7150khz frequency that is displayed. HELP???


Nextion 2.4" display,,, Neat

_Dave_ AD0B
 

A ham friend, a Bitx owner, my Elmer, KD0YTE, gave me a Nextion display for Christmas. I was surprised at how easy the install went on my ubitx v3.

A big thanks to both KD8CEC for designing such a neat product and KD0YTE for giving me the screen.


Re: JackAl display delivery times #ubitx

Jack, W8TEE
 

The code for doing the calibration is not trivial, as the display is not linear. That is, moving down 5 and across 4 doesn't necessarily put you on the right cursor. By the time you get to the lower-right quadrant, it's off quite a bit. We had to account for that slop in our code.

Jack, W8TEE


On Tuesday, December 11, 2018, 1:18:37 PM EST, Neil Goldstein <neilgoldstein@...> wrote:


Thanks for the quick reply Jack.  

I pretty much expected the board+BOM method, which is fine.  I've done that before. I'm patiently awaiting the availability as I'd love to play with this.  I have an unmodified EARLY uBITX that I've had wonderful results with using an AlexLoop.  

I may purchase BOTH resistive and capacitive and see how they work out.  I think the cap screen should be OK as long as we have a way to tweak the calibration.

--Neil, W2NDG, radiokitguide.com


Re: Ashhar Farhan #ubitx

Evan Hand
 

Ashhar as stated that he has prototype boards with the fixes that he is testing.  I have not heard of any fixes currently in production.  This was last week that I remember seeing the note from him.

I am over 65, so memory can play tricks on me at that age ;)

73
Evan
AC9TU