Date   
Re: Latest Build, Mods and results.

Mharpen@...
 

Brad, BINGO!

Mike N6CMY

Re: Latest Build, Mods and results.

Nick VK4PP
 

Ah, too easy, I was hoping it was done via software and able to TX a much lower power carrier for tuning, not the full 15W...
Any ideas and thoughts?

Re: UBITX Touch Control TFT Display

Joe
 

Hi,

Glad its working

1. The save function is for the mem channels

2.  In the code there are locations where you can enter your actual bfo1 reading
Around lines 183-185


3. Also there is a location called offset which allows you to compensate if your off freq. Around line 80
Volatile unit32_t if_offset =  -300; //  you enter your offset if it is off freq.

4. In the next version you will be able to set an offset for each band.

Joe
VE1BWV



On Tue, Jun 12, 2018, 7:06 PM harleyleenuke <vfrank59@...> wrote:
Joe,
 I have my TFT Display working fine. PTT and all.

I have a question regarding bfo calibration.  I am able to align it but unable to Save the bfo caiibration.  I press the V
Save button on the screen and it quicky flashes.  Then when I turn the radio off and back on, it reverts to a default, i think.   I lose my previous calibrations. 

Also, should I have t save LSB cal.  and also USB Cal. separatly?

Thanks,
 Vern

Re: UBITX Touch Control TFT Display

harleyleenuke
 

Joe,
 Terrific, I will adjust the code. 
Thanks,
Vern

Re: Latest Build, Mods and results.

brad martin
 

Isn’t there a pot that controls the output power? If so you could make a low power switch that is just adding a resistor in parallel or series depending on the circuit. I’m just walking and thinking here so don’t have the schematic easy to get.

Brad

On Tue, Jun 12, 2018 at 6:47 PM Nick VK4PLN <nickpullen@...> wrote:
Ah, too easy, I was hoping it was done via software and able to TX a much lower power carrier for tuning, not the full 15W...
Any ideas and thoughts?

Re: CB amplifiers RM-Italy KL203P

Richie Chambless
 

Thanks Allison! I’ve seen these amps used on EBay and thought they could be repurposed. This sounds like a cheaper and easier alternative to scratch building a 100 watt amp.

Re: 2.5 MHz low pass fiilter uses no toroids, SMDs #ubitx

Glenn
 

Hi Paul,
I wanted something fairly small and quick hence no toroid winding, and looking  through my SMD inductor box, found the ones shown. 1812 footprint. Nothing special. Similar parts available from Element14 at about 50c. 2493202

The Rigol SA with tracking generator is a VERY handy thing to have for homebrewers. There is also the newer but similar Siglent  SSA3000x series,  that's slightly more expensive. (I have no ties to either of these companies)

Glenn
vk3pe


On Mon, Jun 11, 2018 at 08:47 pm, VK3HN wrote:
Good looking trace from a HPF made of surface mount inductors and capacitors. I'm not surprised by the use of s.m. caps but inductors does surprise a little.  I would have hand wound them on T37-2 (at a minimum).  Are they anything special Glelnn?  --Paul VK3HN.  

PS: I want a Rigol DSA815 (!)

Mobile operation (uBITX on car)

David - CA3DPV
 

Hi!

I remember a few weeks ago i read something about some problems with the AF amp and 13.8V power sources (shame on me, i can't find it again). It's safe to use a 13.8V source? I want to mount a ubitx on my car for mobile operation.

73 from Santiago de Chile,

David - CA3DPV

Re: Mobile operation (uBITX on car)

iz oos
 

The TDA2822 used up ver. 3 is a bit delicate. I read the absolute voltage rating is 15vdc. I normally use mine with 13.6vdc.


Il 13/giu/2018 07:56, <david.parra@...> ha scritto:
Hi!

I remember a few weeks ago i read something about some problems with the AF amp and 13.8V power sources (shame on me, i can't find it again). It's safe to use a 13.8V source? I want to mount a ubitx on my car for mobile operation.

73 from Santiago de Chile,

David - CA3DPV

Re: Mobile operation (uBITX on car)

MVS Sarma
 

The best appears to have a 7808 regulator to power TDA2822 instead of 13.8 odd voltage.


Regards
MVS Sarma
 

On Wed, Jun 13, 2018 at 12:20 PM, iz oos <and2oosiz2@...> wrote:

The TDA2822 used up ver. 3 is a bit delicate. I read the absolute voltage rating is 15vdc. I normally use mine with 13.6vdc.


Il 13/giu/2018 07:56, <david.parra@...> ha scritto:
Hi!

I remember a few weeks ago i read something about some problems with the AF amp and 13.8V power sources (shame on me, i can't find it again). It's safe to use a 13.8V source? I want to mount a ubitx on my car for mobile operation.

73 from Santiago de Chile,

David - CA3DPV


SI5351 quadrature VFO

Miguel Angelo Bartie
 

Hello Guys

In my home page the new VFO in quadrature using SI5351 and Arduino nano.
from 4.76 to 220MHz ...direct 90 degrees phase shifting. TRX #183


http://py2ohh.w2c.com.br/

73 de py2ohh miguel

Re: SI5351 quadrature VFO

Miguel Angelo Bartie
 

I forgot to add the sketch ...now is OK

73 from py2ohh miguel

Re: Mobile operation (uBITX on car)

Daniel Conklin
 

Here's a link to the regulator in the audio line mod 
https://groups.io/g/BITX20/message/44099

Re: Mobile operation (uBITX on car)

ajparent1/KB1GMX
 

Good mod I did the same.

Its important when you battery voltage is not a stable power supply.  Audomotive power
is an example of that.


Allison

Re: Latest Build, Mods and results.

K9HZ <bill@...>
 

Check uBITx.net.  Already there. 

 

Dr. William J. Schmidt - K9HZ  


On Jun 13, 2018, at 12:07 AM, brad martin <emclinux@...> wrote:

Isn’t there a pot that controls the output power? If so you could make a low power switch that is just adding a resistor in parallel or series depending on the circuit. I’m just walking and thinking here so don’t have the schematic easy to get.

Brad
On Tue, Jun 12, 2018 at 6:47 PM Nick VK4PLN <nickpullen@...> wrote:
Ah, too easy, I was hoping it was done via software and able to TX a much lower power carrier for tuning, not the full 15W...
Any ideas and thoughts?

 

 

Re: ubitx first power up

KM4TRT
 

I tried adjusting the BFO and it helped a whole lot about 11.997.  After watching VK3YE's video, I'll go back and fine tune. That guy always has great stuff.
One thing he implied was that even though the display says 11.995 when you go in, the last setting you made was still there until you change it.  I'l confirm that with the scope.
Andy KM4TRT

Re: SI5351 quadrature VFO

Ashhar Farhan
 

Miguel,
Your work is always inspiring, thanks for this. It is a keeper. 
73, f

On Wed, 13 Jun 2018, 16:29 Miguel Angelo Bartie via Groups.Io, <py2ohh=yahoo.com.br@groups.io> wrote:
Hello Guys

In my home page the new VFO in quadrature using SI5351 and Arduino nano.
from 4.76 to 220MHz ...direct 90 degrees phase shifting. TRX #183


http://py2ohh.w2c.com.br/

73 de py2ohh miguel

Re: Latest Build, Mods and results.

Roy Appleton
 

What's already there????

Roy
WA0YMH

On Wed, Jun 13, 2018, 9:15 AM K9HZ <bill@...> wrote:
Check uBITx.net.  Already there. 

 

Dr. William J. Schmidt - K9HZ  


On Jun 13, 2018, at 12:07 AM, brad martin <emclinux@...> wrote:

Isn’t there a pot that controls the output power? If so you could make a low power switch that is just adding a resistor in parallel or series depending on the circuit. I’m just walking and thinking here so don’t have the schematic easy to get.

Brad
On Tue, Jun 12, 2018 at 6:47 PM Nick VK4PLN <nickpullen@...> wrote:
Ah, too easy, I was hoping it was done via software and able to TX a much lower power carrier for tuning, not the full 15W...
Any ideas and thoughts?

 

 

Re: Learning Arduino

Paul Galburt - K2AYZ
 

Thanks, Ken

I signed up for the course. I have done Arduino programming but I am no ninja. I hope I can make 7AM :)

73,

Paul - K2AYZ

Re: Latest Build, Mods and results.

Jerry Gaffke
 

Pot RV1 on the uBitx varies output power.

VK2ETA came up with a way of using the shoulder of the 45mhz crystal filter to vary the output power. 
 https://groups.io/g/BITX20/message/46235
and wrote software to implement it:  https://groups.io/g/BITX20/message/50215
I believe this has also been incorporated into the KD8CEC firmware.
Requires no hardware mods.  This only works for SSB transmissions and not for CW,
though could be extended to CW if signal CW-KEY were injected into the second mixer instead of the first mixer.
No easily discernible change to the audio, though will be some variation in the audio response:
    https://groups.io/g/BITX20/message/50265
    https://groups.io/g/BITX20/message/50279

The uBitx.net site is getting rather large.  To say there's some sort of solution there
is becoming akin to saying there's a solution in one of the 52000 posts in this forum.
My best guess is that Dr Bill is suggesting an implementation involving a new PC board
controlled by extra pins from the Raduino to run some relays that select various 
preset attenuators.

There are plenty of other ways to do this, most involve hacking in some sort of attenuator.

Jerry, KE7ER


On Wed, Jun 13, 2018 at 07:14 am, K9HZ wrote:
Check uBITx.net.  Already there. 

 

Dr. William J. Schmidt - K9HZ  

 
On Jun 13, 2018, at 12:07 AM, brad martin <emclinux@...> wrote:

Isn’t there a pot that controls the output power? If so you could make a low power switch that is just adding a resistor in parallel or series depending on the circuit. I’m just walking and thinking here so don’t have the schematic easy to get.

Brad
On Tue, Jun 12, 2018 at 6:47 PM Nick VK4PLN <nickpullen@...> wrote:
Ah, too easy, I was hoping it was done via software and able to TX a much lower power carrier for tuning, not the full 15W...
Any ideas and thoughts?