Date   

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


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: 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 (!)


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: 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: UBITX Touch Control TFT Display

harleyleenuke
 

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


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: 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: Latest Build, Mods and results.

Mharpen@...
 

Brad, BINGO!

Mike N6CMY


Re: CB amplifiers RM-Italy KL203P

ajparent1/KB1GMX <kb1gmx@...>
 

Richie,

Its not so much what they use but how they use them.

I have a Silconix 100W SS (literally CB) amp.  Got it cheap for modding.  Base design is
EB63/Granberg with shortcuts and omissions.   Only a few things wrong with it.  Class B
zero bias (no bias circuit at all) so it had serious crossover distortion Add a regulated bias
and that cleans up. Then it needed varying drive depending on frequency and a seriously
bad input SWR at all frequencies from 3-30mhz.  New ferrite, equalization network plus
a 2db pad to keep it under 1.7:1.  Remove a half dozen mica caps factory installed to
try and calm the amp, added feedback.  Remove the useless RX preamp as it was
noisy and excessive gain.   Add switched LPF.

So why buy it?  The transistors were good (MFR454s), the heatsink and board were good,
and the TR relay worked.   Use it as was, not on a bet (it worked but RF dirty!).   Once I got
done it was a nice clean 13db amp that could run at 100W easily with 5W drive.

Way to many out there like that.

Allison


Re: ubitx first power up

Mark, KE6BB
 

Take a look at this:

https://youtu.be/sXJmAhpAjeI

I haven't tried to set the BFO in my uBitX, so I can't really vouch to this, but it makes sense and is easy to follow.  It appears that it would affect both RX and TX, except TX in CW mode since that bypasses the BFO and uses Clock 2 from the Raduino directly.  
--
Mark,
KE6BB


Re: UBITX Touch Control TFT Display

harleyleenuke
 

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: Latest Build, Mods and results.

brad martin
 

Just taking a guess that it’s a push button wired to the CW Jack that when pushed its transmits CW as if your holding down a straight key. At least that’s how I’m planning on doing it this weekend.

Brad

On Tue, Jun 12, 2018 at 5:53 PM Nick VK4PLN <nickpullen@...> wrote:
On Tue, Jun 12, 2018 at 11:08 am, <Mharpen@...> wrote:
push button switch to produce a carrier
Mike, could you please share details on how you did this?

Thanks.


Re: Latest Build, Mods and results.

Nick VK4PP
 

On Tue, Jun 12, 2018 at 11:08 am, <Mharpen@...> wrote:
push button switch to produce a carrier
Mike, could you please share details on how you did this?

Thanks.


Re: CB amplifiers RM-Italy KL203P

Russ KG0BK
 

I ordered one just to have some more "fun" with.
Being a broadcast engineer I love to rework something to make it work with something else,
The one I ordered says from 20 mhz to 30 mhz it will do 250 watts.
Power output drops down below 20mhz.
Should be fun to play with.
Should have it by Friday the 15th.
I'll play with it over the weekend and post comments.

Russ     KG0BK


Re: uBITX Version 4 first attempt #ubitx-help #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

Can't comment on the audio.  It s been changed for V4.  However if you expecting a lot of hiss
that not something it does.  Hook it to an antenna and tune around to see.  You should hear
an increase in noise just putting antenna on it and depending on the band, stations.  The
receiver was designed to be quiet, that means low internally generated noise.

I think during the transmission tone there is a spot where you measure the frequency or compare it to
WWV at 10mhz.
Its not unique to V4.  I suspect if you read around you answer is there.

Best I can do as I took a very different path to calibration.

Allison


Re: No Power

G8HAV
 

Many Thanks Ian.



You have help me to solve the problem. Firstly I have been pressing PTT and then keying up. When you described the changes I should expect and as I had no change just keying I checked the commercial keying lead and it had an OC earth connection. I had previously just checked the inner.

Repaired and it popped into life.


Power out is low but there are many suggestions for setting bias and many other ideas.

Getting 2 W on 80M and 40M but .5W on 15M


This is a fantastic piece of learning, even if mine was a basic one, relying on a commercial lead.


Thanks to all and now more trawling and reading so I can get it digital.

Peter Paul Fox G8HAV
Mid-Cheshire Amateur Radio Society
5 Llandovery Close
Winsford
Cheshire CW7 1NA 

Group Controller
Dane Valley RAYNET 
Tel: 01606553401 (H)
Tel: 07919315547 (M)


From: BITX20@groups.io <BITX20@groups.io> on behalf of Ian Lee <kd8cec@...>
Sent: 12 June 2018 00:24:36
To: BITX20@groups.io
Subject: Re: [BITX20] No Power
 
G8HAV

W
Press CW Key and the screen (second line) should change as shown below.
(This is the same for stock firmware, CEC Firmware)
LSB A: 7.010.000     (receive)
    CW: 7.010.000     (when press cw key)
     TX: 7.010.000     (when press PTT)

If there is no change in the screen, check the CW Jack and CW Line. Especially, check the resistance part attached to CW Jack
If the screen changes as above, please check if you can hear the side tone and the relay sound from the speaker.

You can test it with the scope or spectrum analyzer as follows.
RX : 
  CLK0 : 11.9 to 12 MHz measurement
  CLK2 : It depends on your receive frequency and mode.
              if your mode is 'USB' and 
             44998500 + your Frequency = meaurement frequency
TX :
  CLK0 : 0 Hz (Sleep)
  CLK2 : TX Frequency +- (2000Hz because of applied side tone)

Ian KD8CEC

2018-06-12 4:09 GMT+09:00 G8HAV <g8hav@...>:
Thanks Allison and Lee.

There are no changes on the LCD screen. just TX and the frequency in use VFO A. CW is set to ST.

The CW-KCLK#2 R100, and it is not a clean waveform; Scope indicates about 100 mV average.

Hope this helps



--
Best 73
KD8CEC / Ph.D ian lee
kd8cec@...
www.hamskey.com (my blog)


Learning Arduino

Ken Frazer
 

For those of you who are trying to learn Arduino programming, edX is offering a course, Arduino Programming, from novice to ninja. The course covers basic Arduino programming and connecting to and controlling external sensor and devices, such as motors. It also talks about using libraries. The house starts June 18, runs for 4 weeks and typically takes 2 - 3 hours per week of your time. It is also free! 


73s
Ken
KE5JCB


ND6T and K5BCQ = Genius

Bill Carpenter
 

I just finished building and installing the click eliminator in my uBITX and to my utter and absolutes amazement it worked the first time!  I am an experienced kit builder but other then very simple mods and/or repairs to my K3 and KPA500 I have never done anything with SMT stuff.  But the very well put together kit by Kees and the detailed instructions from Don really made it much easier than I thought it would be.  The board ain't pretty what with a few not-so-straight components because I was afraid to move stuff around too much but it works!  Just worked a 2 in VA and got a 579 with my 2 element quad.

And NO CLICKS!


Thanks guys!   May take a while before I try the AGC kit but I plan to soon.

73 Bill NZ0T


Re: Instruction Manual needs revision #ubitx

Richard
 

Does this tune up process work for Align the master clock on the version 4?   When I press the encoder knob it begins to transmit.