Date   

Re: Cw not working with straight key

Nigel
 

Hello Reg and advance apologies to Dave for semi hijacking topic. 

Please can you provide more details re the 2 stage CW filter added? 

I am busy building my v3 uBtix enclosure and pondering options re additional filtering for CW; Audio based? Internal / External? Another crystal filter? Commercial (Sotabeams super fancy software based - expensive!) / home brew...

Your feedback will be much appreciated. P.M. if appropriate. 

Many thanks in advance. 

Best wishes to all and please stay SAFE! 

73

Nigel ZS6RN ex G8DEV a l-o-n-g time ago 


Re: uBITX V6 setup for digital modes #digital #ubitxv6

mark bodlovich
 

I use the Easy-Digi with a USB to Serial adapter and it works well. You can order them already built to work with any radio I think with the USB interface built in. I used the built board and added my own box , jacks and DB 9 connector. Just have to make sure you wire the mic jack correctly for the UBitx. I set rig to none in the FT8 software. For receive I use the USB audio adapter as well , just make sure to select the correct audio sources. Hope this helps. 

Mark
N7HWR


Re: BitX40 Frequency stability problem

Jeff Debes
 

John,

I also have the bitX 40 and the V6 versions.

Since as you say , it’s been sitting a while . Did you try rocking re-seating / cleaning all connectors /  display board?
Oxidation of some connections might be a possibility.
Just a guess/idea ,  but maybe it is just something that simple.

Jeff


On Sep 13, 2020, at 2:59 PM, John Dunnington <jdunnington99@...> wrote:

Allard, Thanks again for your reply, I tracked it down this afternoon after disovering galloping freq shift from a US Ham. Turned out to be the 10 turn pot had lost the connection at the earth end. I had a 5k multi turn which was the nearest replacement I had, anyway has stopped the runaway. I was convinced it was in software, shows what I know.As i said last time it has to have valves inside the cabinet for me.
Kind Regards
John GM4EIW

--
jeff.debes@...


Re: Please explain to me how works the VFO's

Gerard
 

hello,
I did some tests again today. The change on the inductances coming out of the 45 mhz filter did nothing more.
I think it’s at its limits and it lacks sensitivity
I compared the shematic (see pdf)  and that of a V3 --->
https://www.hfsignals.com/wp-content/uploads/2017/12/ubitxv3.pdf             ---->(With also 2N3904).
I see only a pb on schematic on the 1st transistor and the resistance of 220ohm.

The collector is directly connected on the power RX, on µbitx V3, it's pass trought this resistance.
Schematic error and good on the PCB. I will check tomorrow. 
Or it doesn’t matter how it works. A transistor specialist will tell us that. In any case, as already said, we will make the modification if necessary.
There is also a small difference in the 45mhz filter and impedances. (see schématic)
If I test with RFsim 99 the filter made of 2 inductances of 0.8µH and capa of 6.8pf, it indicates a loss of 10db at 45mhz. This is not negligible.
So there’s still a test to be done.
Otherwise, on the 7MHZ, I have a lot of conversations,English, Italian, Deuch, but still weak.You need to stick your ear to the speaker.
Amplificator works fine, I tested it with another source
cdt


Re: BitX40 Frequency stability problem

John Dunnington
 

Allard, Thanks again for your reply, I tracked it down this afternoon after disovering galloping freq shift from a US Ham. Turned out to be the 10 turn pot had lost the connection at the earth end. I had a 5k multi turn which was the nearest replacement I had, anyway has stopped the runaway. I was convinced it was in software, shows what I know.As i said last time it has to have valves inside the cabinet for me.
Kind Regards
John GM4EIW


Re: BitX40 Frequency stability problem

Allard PE1NWL
 

Hi John,

are you still using the original 1-turn tuning pot or did you replace it by a 10-turn pot?
The phenomenon you are describing is the "galloping" feature. By default the tuning pot covers only 50 kHz tuning range from full CCW to full CW. When you hit either end of the pot, the radio will start "galloping" up or down in steps of 10 Khz. Galloping will stop when it reaches the ultimate band limits (7000 or 7300 kHz).

If you use a 10-turn pot instead of the original 1-turn pot, you can change the tuning range to 200 KHz in the SETTINGS menu. This will prevent the radio from "galloping" as the tuning range wil then cover the entire ham band.

73 Allard PE1NWL


BitX40 Frequency stability problem

John Dunnington
 

Hi all, I purchased a BitX40 s/h rig with a view to use it portable, I have used it at home but it has not been fired up  for a couple of months. Powered it up the other day to find whilst the radio appears to work, frequency control is missing.  I don't see anything out of place in the hardware. I can see 0 to 5V on the pot.
I cannot tune a frequency, turning the pot cw the frequency tracks up to 7300 beeping as it passes 7200. Turning the pot ccw it the tracks all the way back down to 7000khz. No control on RIT either.
I have tried a factory reset. It is using 1.29 version that's what it says on boot up.
Can anybody give me some advice, oh to be a young wizz kid.
Regards
John GM4EIW


Re: Please explain to me how works the VFO's

Gary Anderson
 

Hi Gerard,
You don't want the inductors in parallel, especially at close distances.
If trying the axials, still don't mount them in parallel.

With your layout, use the Z-Axis to be orthogonal.

| -----|
L     |
L     |
L     |
 |     |----
 | PCB  |

--LLLL--
| PCB  |

Beyond my expertise, but I would venture that you would be better off with rewinding one toroid  with longer leads and mounting it 90 degrees off in either the Y or Z plane.
You can experiment, and others with more experience can give advice.  Electrically, no reason why both are on the same side of the PCB.  (e.g. 1 toroid flat on the bottom of the PCB)

Regards,
Gary


Re: Please explain to me how works the VFO's

Gerard
 

Evan, jack
At first I improved my provisional antenna, it is very slightly better.
I think I’m on to something, and that would be more in the design.
The 45MHZ filter is a little different on the M0thy model. However, for the 2 selfs, it uses axial inductances. Me, I wound these 2 inductances on tores. So the tores are glued together next to each other. There must be an induction effect.
Look at the pictures, it’s very airy on the µBitx and much less on mine.
This may be the solution!!
I’m going to desold and replace the tores. It doesn’t cost anything to do it.
cdt


Re: Cw not working with straight key

Reed N
 


Re: Cw not working with straight key

Bob Bennett
 

Thanks Bill. I have the v.6. I will look for Reed’s software. I assume it is in the group File directories 
--
Bob
NZ2Z


Re: Please explain to me how works the VFO's

Evan Hand
 

Gerard,

I would try using the IF Shift function in the KD8CEC software to see if that helps.  There could be an alignment issue between the 45 MHz roofing filter and the second IF vfo.  The IF Shift changes the second IF vfo frequency a small amount in either direction.

The other thing that I would try is to remove the AGC function with Q1 by removing the gate signal.  Q1 could be drawing down the input to the audio amp too much.  I do not see a way to adjust that level.

Just suggestions for you to try.
73
Evan
AC9TU


Re: Please explain to me how works the VFO's

Gerard
 

Hello,

It's version V4 + nextion
All is ok for the soft i think. i can go in all the options of the menu + calibration + BFO
The Nextion work 
The main menu works with the frequency display, etc
I hear conversations, but the sound is weak.
It falls after the 12Mhz filter.
I need to recontrol this part.
cdt


Re: uBitx V5

Derek Jacoby
 

Hi, I'm Derek. I just replied to the poster above. I don't need the v5 board, I have one I haven't assembled. I just pulled out of the box to do so last week and noticed a couple broken toroids. Which are on their way. It will be my first toroid winding adventure.

But I'm interested in any of the other bits and pieces. Feel free to ship them the original person on this thread if its easiest for them all to go the same place, but they look like things I'll need if you want to sell me the bits he doesn't want.

Thanks!

Derek
KE7FYX


Re: uBitx V5

3boysdad@...
 

I think I need to admit I'll never build mine.  Have v5, a case, a nextion LCD screen.  been sitting in the garage for ... maybe a year at this point.

and this.

https://shop.kit-projects.com/index.php?route=product/product&product_id=101

and this.

https://elekitsorparts.com/product/ubitx-digi-interface-module-add-on-board

still in their boxes (except the AGC module).

let me dig around and make sure i have everything.  you can reach me at ki6nlc@....  

 


Re: Please explain to me how works the VFO's

Evan Hand
 

The other question is which display are you using?

As far as I can tell from the schematic that is referenced in the link you provided, it is equal to a v3 or v4 board.  You should use one of the schematics from HFSignals for one of those boards for reference.

The Ashhar Farhan stock software from either the v4 or v4 should work. The alternative is the KD8CEC software.   As I had stated before, I would go with the KD8CEC software and the Nextion display.  You could use the 1602 parallel input display as well.  Both can work with that software.  You will need to select the version for the display that you choose. 

The v6 software will not work without a lot of modifications.  I do not know of a version that allows adjustment for different (earlier) boards.  This includes the version from Reed N.

73
Evan
AC9TU


Re: Please explain to me how works the VFO's

Jack, W8TEE
 

So, are you using the software distributed by HF Signals or some 3rd party?

Jack, W8TEE

On Friday, September 11, 2020, 3:13:58 PM EDT, Gerard <kabupos@...> wrote:


Jack, 
Remenber. It's an home made. Pcb, tricoils, the case  and others. All is made with my hands!!!
It's a big project, but beautifull to do.
I bought components with Amazon in china, great britain with Ebay. Also in France.
You’re going to say it’s expensive, but it’s a choice
i think we are getting close to the goal.we need to understand how things work and right settings. We make progress day by day.

To see how to do the home made:  https://ubitx.net/2018/07/02/homebrew-ubitx-with-through-hole-components/

cdt

--
Jack, W8TEE


Re: Please explain to me how works the VFO's

Gerard
 

Jack, 
Remenber. It's an home made. Pcb, tricoils, the case  and others. All is made with my hands!!!
It's a big project, but beautifull to do.
I bought components with Amazon in china, great britain with Ebay. Also in France.
You’re going to say it’s expensive, but it’s a choice
i think we are getting close to the goal.we need to understand how things work and right settings. We make progress day by day.

To see how to do the home made:  https://ubitx.net/2018/07/02/homebrew-ubitx-with-through-hole-components/

cdt


Re: Cw not working with straight key

Bill Cromwell
 

Hi,

What model are you using? The original stock software made CW useless due to that lag. For the model number 6 get Reed's software. For earlier models get the CEC software. I have the model number 3 and the CEC software made it *useable*.

73,

Bill KU8H

bark less - wag more

On 9/11/20 2:18 PM, Bob Bennett via groups.io wrote:
Has anyone found how to get rid of that little lag of about a second when you first key down? It is the one thing that has kept me from using my radio (and that I can’t find the mic).
--
Bob
NZ2Z


Re: Replacing SMD component

R. Tyson
 

Hi Evan.
Many thanks to you for all the good info. you give out on here.
The voltage table for various transistors that was posted and specifically the voltages to be found on Q90 were a great help.

73's

Reg          G4NFR

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