Date   

Re: Assembly instructions for the ubitx v4

Mario Koppensteiner
 

Hello Evan,

Am 16.08.2020 12:59, schrieb Evan Hand:
Mario,
The Mini manual that Rick Price provided contains the following
information from HF Signals:
https://www.hfsignals.com/index.php/ubitx-wire-up/
I saw this page already. I does not explain how to connect the AGC and the AMP to the board.


Both can be used to wire-up the uBITX v3, v4, or v5 manual with the
stock configuration. I would highly recommend that you verify stock
operation before you add the Nextion display. You might want to do
that before you mount it in the case.
I'll have a try when I have connected all the wires.

[...]

73

Mario Koppensteiner
OE5MKE


Re: Assembly instructions for the ubitx v4

Mario Koppensteiner
 

Hello Mark,

Am 17.08.2020 14:43, schrieb Mark M.:
Hi Mario,
The diagram is actually good for three versions (v3, v4, v5). The ham
who posted the one you looked at just put a wrong title in (probably
because he had a v5). The original diagram was done by W4RJP and was
for the v3 (see link further down that section). The only difference
between the three versions are some mainboard changes, the connections
are still all the same.
thank you for your response.

I still need to know how to connect the AGC and the AMP to the ubitx board.

73

Mario Koppensteiner
OE5MKE


Re: Assembly instructions for the ubitx v4

Mario Koppensteiner
 

Hello Evan,


Am 17.08.2020 13:23, schrieb Evan Hand:
Mario,
From the links and your description, I assume that you have an
Amatuerradiokits case with the audio amplifier.
Yes I have.

If that is correct,
then the data that I have shows a TA4225 (not a TA4425) audio amp IC
as the audio amp. That is a 5 terminal device, not 3. That board is
very cramped, so it could be that the silk screening is really
pointing out the TA4225 5 pin socket and not the 3 holes that are
close by.
Sorry for the confusion. The part has 5 terminals. That's true.l

Attached are the 2 pdf files that I have for the audio amp.
I saw this already in the documentation. On the first pdf there are 3 terminals shown. The top one is for the power. the middle is labed "A/IN" and the bottom terminal is labled "AGC V". Both Terminals do have 2 pins each. Where should I connect this pins of the 2 terminals?

My guess is that the 3 hole location is for the onboard "volume"
control that is really a maximum volume control as the front panel
volume control is used to adjust the volume in operation. You should
have a blue 3 terminal variable resistor that goes into that location.
true

[...]

Please help me to get this AGC and the AMP connected.


73

Mario Koppensteiner
OE5MKE


Re: Assembly instructions for the ubitx v4

Mario Koppensteiner
 

Hello Bob,

Am 16.08.2020 03:22, schrieb Bob Lunsford via groups.io:
If I remember correctly on my V4 build, there are/were no specific
assembly instructions. I used the block diagram for the wiring which
made sure to connect everything where it needed to go.
Did you are the AGC and the AMP too?

[...]

73

Mario Koppensteiner
OE5MKE


Re: Assembly instructions for the ubitx v4

Mario Koppensteiner
 

Hello Rick,

Am 20.08.2020 00:40, schrieb Rick Price:

Hello Mario,
Yes, I saw in one of your messages after I sent the file that you had a
nextion case from amateurradio kits. If you still do not have the
instructions for assembly follow the link below and go to the bottom of the
page. There you will find a file with all of the instructions to download
for the ubitx nextion case.

https://amateurradiokits.in/downloads/


I did download this 7z archive already. There are lots of pictures included of an already assembled ubitx. most of the wires are brown and black on the pictures and you can't follow the single wires on the pictures. So I still do not have a plan how to wire the terminals of the AGC and the AMP.

Please help!

73

Mario Koppensteiner
OE5MKE


Re: LTSpice 17

Tom, wb6b
 

On Mon, Sep 14, 2020 at 11:49 AM, Gerard wrote:
try LTSpice 17, you can simulate electronic circuits.
See examples on the soft
Your message is a great reminder that I need to get back to learning better how to use these tools.

By the way, here is a direct link to the Analog Devices LTSpice download page:
https://www.analog.com/en/design-center/design-tools-and-calculators/ltspice-simulator.html

I've also played a little with ngspice:
http://ngspice.sourceforge.net

And there is another that I don't recall at the moment, that was an expensive paid product where the developer retired and now offers it as a free download. Anyone remember which this is?

One of the schematic capture cad packages I was using had Spice "integrated" into it, but setting up the signal generators and monitoring (test) points was still somewhat difficult. I'd like to improve my early beginner level of ability with Spice. It has been a while since I used these and have likely forgotten all of the little I knew already. 

For those that are more experienced with Spice, what is your favorite? Any practical hints? Anyone know of any good tutorials?

Tom, wb6b


Re: Replacing SMD component

Lawrence Galea
 

Congratulations.
I also use a toothpick and paper glue stick.
I just ut the toothpick point in the stick, then on the component and put it in place
Regards 
Lawrence

On Fri, Sep 11, 2020 at 8:33 PM R. Tyson via groups.io <tysons2=btinternet.com@groups.io> wrote:
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


MSHV SOFTWARE FOR FT8 VERSION

Rubens Kamimura
 

ALL,

COULD ANYONE INDICATE THE BEST VERSION OF THE MSHV SOFTWARE FOR FT8, TO BE INSTALLED ON uBITX V4?
--
73's de Rubens PY2PVB
GG49In - Ilha Solteira SP Brazil


Re: Cw not working with straight key

R. Tyson
 

Nigel,

Just checked sotabeams site again and this time it responded. That filter has a message stating that more stock is due in Autumn.

Reg                      G4NFR


LTSpice 17

Gerard
 

hello,
i think you know some software helpfull like RFSim99, Dishal, Tore calculator.

try LTSpice 17, you can simulate electronic circuits.
See examples on the soft

cdt


Re: Cw not working with straight key

R. Tyson
 

Hi Nigel,

The two stage filter I used came from -

              https://www.sotabeams.co.uk/audio-filters-and-more/

I gather you have already looked at them ? They do a couple of cheaper dual bandwidth filters, one for SSB and CW and the other one specifically for CW. I don't intend using the uBitX for anything but CW so that was the filter I bought at aprox. £29.

The bad news... I have just looked at their site and that filter as well as other stuff is shown as out of stock. It won't let me click on it so there seems to be no further information at the moment. I know it has recently changed ownership so I don't know what is going on. Perhaps they are just out of stock - or - is the product line being streamlined ?
If you were interested in a filter you would have to contact them to find out what is happening.

It would be a pity if they dropped it as it is a very good filter and not a bad price.

Dual Bandwidth Filter Modules SSB/CW

£29.95 (Inc. Tax)
£24.96 (Ex. Tax)


Reg          G4NFR

 


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

Gerard
 

hello,

I re-checked the pcb. The cabling is correct.
For me, there is only one solution: Replace the 2n3904. they may be of poor quality. I don’t have a bfr at my fingertips, but I’m going to do a test with 2n2222.

cdt


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