Date   

Re: New build uBITX wont run

ajparent1/KB1GMX <kb1gmx@...>
 

Make sure you not in transmit mode!

Check the switched 12V line to see if its 12V-T or 12V-R

Two most common problems is forgot the resistor for the key (4.7K) so its in CW tx mode.
And the TX (transmit line, orange) is grounded due to wrong pin on mic socket or even mic plus.

Allison


Re: End Fed antennas w/ uBITX #ubitx

ajparent1/KB1GMX <kb1gmx@...>
 

Iz oos,

The amount of wire interacts as well.  for example the white toroid with lots of
wire runs into self resonance at 20.8 so any frequency close to that will be impaired.
At low frequencies there is not enough inductance. Over all also the mutual inductance
and coupling looks to be poor (coupling factor of less than 1).

The choice of the 150pf cap may even be wrong I've tried a mica trimmer 
on some of the published designs and the 150pf value was not what I
arrived at.  

The smaller core sounds like 43 material and not always a good choice.

Winding transformers for any use is not a random thing there is science to it but in
the end how the windings are organized, conductor size, and transformer material
all interact.

Allison


Re: Lead-free solder, regular solder

Jon Titus, KZ1G <tituskz1g@...>
 

As a youngster I wondered why the tips on my Weller soldering gun broke after intense use.  I wired large relay terminals, switches, and small light bulbs for projects.  Turns out the solder dissolves copper, so little by little the tip would get eaten away.  Copper or alloys might also dissolve in lead-free solders, which leads to soldering-iron degradation.  Some time ago a company in the UK sold solder with a small amount of copper in it, which stopped or reduced the decay of iron tips.

For an interesting article about copper dissolving in lead-free solders, see: https://www.smta.org/knowledge/proceedings_abstract.cfm?PROC_ID=1976
--
Jon Titus, KZ1G
Herriman, UT USA


New build uBITX wont run

Matthias Zwoch
 

Found now time to wire up my uBITX V4.3. After that I switched it on and measured the current. It took 370mA - too much. No magic smoke, nothing warmed up except the 5V regulator on the Raduino board after some time.
The display came up with uBITX V 4.3 and frequency, could walk to the menues and tune. No reception at all. To get the reason why it consumes 390 mA I tried to get the current of the several function blocks:

uBITX board without Arduino, Raduino and display: 84mA
uBITX board with Arduino, Raduino and no display: 350mA so dispylay and backligth take 20mA
uBITX board and Raduino only 294mA (-84mA Board ) = 210 mA only for the raduino board (?). Both connectors were plugged off.

Had a look at the Si531 BQPC 729. It gets 3,68V when the Arduino is in.
The I can see between 2.4 and 2,5V at C4,C5 and C6. But no wave out at the 50MHz scope. It has no voltage at Pin1,C4,C5,C6 if the Arduino is away. But in both cases (!) the power consumption is 294mA.
Has ayone an advice where to look next?

73 Matthias, DD7NT


Re: Need New Raduino Board

ajparent1/KB1GMX <kb1gmx@...>
 

Since the group using mail have no memory.

Check here.

http://www.w0eb.com/

Allison


Re: Fried irf510s replaced but

ajparent1/KB1GMX <kb1gmx@...>
 

Jeff,

K2, nice.  Not always noted but it was a simple radio that made the top of
Bob Sherwood's receiver list for performance.  It was that good.

As to the ubitx I knew of I suspect some of the 20m coils got put in where
the 40M coils should be.  They were the same and as a result short on wire.
Rewound with wire on hand and 40M had less power than 80 and more than
20M which is normal.

Alliosn


Re: hi from italy---

iz oos
 

Hi in izq Danilo, the 2822 was used up to ver. 3. Then as the failure rate was high it had been replaced by a different circuit. The 2822 by the way was able to produce a pretty loud volume. In your case check whether the volume pot was properly wired.


Il 25/ago/2018 18:51, "danilo datres" <in3izq@...> ha scritto:
hello guys, i'm  in3izq danilo  and  just  have  finish my  ubitx ver. 4.3 .

have  some problem : audio  is very loud ? its because tda 2822 is broken ? on  mother board have not found 2822.  maybe is next version ?

sorry  for my  english,  hope you understand.   have read  more message , but are now

in high sea.....best '73  and tnx in advance  for  help   in3izq danilo






hi from italy---

danilo datres
 

hello guys, i'm  in3izq danilo  and  just  have  finish my  ubitx ver. 4.3 .

have  some problem : audio  is very loud ? its because tda 2822 is broken ? on  mother board have not found 2822.  maybe is next version ?

sorry  for my  english,  hope you understand.   have read  more message , but are now

in high sea.....best '73  and tnx in advance  for  help   in3izq danilo


Re: kd8cec sketch

Bill Cromwell
 

Hi,

I only have Linux and it all worked for me. I have already mentioned that I came to several stumbling places but the instructions (when I bothered to read them) got me past to those and all the way to the finish -eben though I found mistakes in them. Other notes explained those, too. I abandoned Microsoft when I bought NT 4.0 Back Office and then Microsoft told me it won't run unless I buy several more hundred dollars worth of software. I used the parts that came with the licenses I got in the packages and when those expired I was at 100 percent Linux. You only get to screw me once!

Actually we have started using Android and Apple systems. MS is dead to me.

73,

Bill KU8H

On 08/25/2018 12:37 PM, terryhugheskirkcudbright via Groups.Io wrote:
hi

It works ok in windows but not linux

Arduino.h (with a capital A) in is in
Home/Desktop/arduino-1.8.6/hardware/avr/cores/arduino

Maybe i will just use windows although my main computer uses linux

Terry
--
bark less - wag more


Re: End Fed antennas w/ uBITX #ubitx

iz oos
 

I would like to share with you the results from two different experimental 1:49 transformers I made. First one is low power made with just a small binocular ferrite. Primary has just 2 turns and 8.8uh, secondary 14 turns 413 uH. 150pf across the primary . I don't know the material but I see not measurable SWR without termination. Terminating with a 2500ohm resistor i find an SWR close to 1.2 on 160m dipping on 80m and rising up to 1.80 on 40m. Beyond 40m swr is higher. The other transformer is made with a T200-7 (white, iron powdered toroid). Primary and secondary dc isolated, 90 turns (about 90uh) on the secondary and 12 turns spread over the primary over 200 degrees (about 2 uh) . Primary and secondary windings are made with enameled wire and there is a layer of transformer tape between the secondary and the primary. There is no fancy winding (no change of winding direction) just primary over the secondary. 120pf across the primary. Without termination I got infinite swr below 20Mhz. The secondary is 7 meters long and SWR is very low on 20.8mhz. Terminating with a 2500ohm resistor SWR is descending to something more than 2 on 80m, 1.3 on 40m and 1 or very close to 1 on 30m, 20m and 17m. Using a 360pf variable instead of the fixed cap the SWR drops on 80 to 1.67 and close to 1 from 40 to 17m band. As said to make a proper test I should do a back to back test but it seems to me now that both transformers may work reasonably well, the small ferrite transformer on low bands and the iron powdered cores one well from 80 to 17m bands. So, even if the material of the cores were likely not to be the proper ones, it seems they may be used for building high transformation ratio conventional transformers, albeit not extremely wideband.


Il 07/ago/2018 19:41, "ajparent1/KB1GMX" <kb1gmx@...> ha scritto:
Iz oos,

Even a small core can handle more power than though if its not lossy or a lossy winding scheme.

I've used BN61-202s with no issues at 10W.  and the much larger 3312 (hard to find in 61) size to 100.

Stacking 4 FT50-61 (2x/2x) as a two hole core  can work well too.  Treat the hole just like standard
two hole core.  That will take maybe 20-25W.

Allison


Re: kd8cec sketch

terry hughes
 

hi

It works ok in windows but not linux

Arduino.h (with a capital A) in is  in Home/Desktop/arduino-1.8.6/hardware/avr/cores/arduino

Maybe i will just use windows although my main  computer uses linux

Terry


Re: Homebrew from scratch #ubitx

Ben Holmes
 

Thanks Howard! I've downloaded ViewMate, and am working my way through it.


Re: Homebrew from scratch #ubitx

Ben Holmes
 

No, Peter's files don't include a .drl file.

Thanks! That gives me a direction...


Re: Bitx40/Ubitx for sale #bitx40 #ubitx

Robert Ray <rmray65@...>
 

The unbuilt bitx40 with no raduino is SOLD!

If someone is interested in the mostly built bitx40 (that is currently in the lunch box), I am happy to disassemble and package in a smaller box, saving on shipping.

Just let me know!  KD0YMC - 3402ray@...


Re: Homebrew from scratch #ubitx

Gordon Gibby <ggibby@...>
 

Do your files include the .drl file?   That’s usually the hangup for me. From dip trace you have to do a second export to get that file    Without it they won’t make the printed circuit. 




On Aug 25, 2018, at 11:02, Ben Holmes <judosandan@...> wrote:

I've been trying to get a PCB from Peter's Gerber files, I'm assuming a 6x6in PCB - but the Gerber files are unreadable by the company I paid... I'm presuming a version error in the Gerber files. Anyone have ideas for free software that can import a Gerber file?

I'd hate to start from scratch - knowing that others have already done the work - but it may come to that...  I'm not experienced in creating PCB's...


Re: Homebrew from scratch #ubitx

Howard Fidel
 

I use ViewMate, it is free:
https://www.pentalogix.com/t/software-products/viewmate

Howard
Quoting Ben Holmes <judosandan@gmail.com>:

I've been trying to get a PCB from Peter's Gerber files, I'm assuming a 6x6in PCB - but the Gerber files are unreadable by the company I paid... I'm presuming a version error in the Gerber files. Anyone have ideas for free software that can import a Gerber file?

I'd hate to start from scratch - knowing that others have already done the work - but it may come to that...  I'm not experienced in creating PCB's...


Re: kd8cec sketch

Joe Milosch <zzmiloschxx@...>
 

On Sat, 25 Aug 2018 07:12:35 -0700
"terryhugheskirkcudbright via Groups.Io" <terryhugheskirkcudbright=yahoo.co.uk@groups.io> wrote:

Hi, for me, and a few others, the KD8CEC sketch gets the CW straight keyer to work
as it is supposed to. The default sketch didn't work for cw.

Upon studying the CEC sketch there are too many
improvements for me to fully understand or mention.
See http://www.hamskey.com/2018/05/ubitx-firmware-cec-version-108-release.html

From my first observations, the manual is better:
http://ubitx.net/wp-content/uploads/2018/04/ug1072_087.pdf

Plus you can use a useful tool called the Memory Manager
which allows you to make settings on the Raduino easily.
I use linux, and the Memory Manager also runs on it thru the
Mono .Net framework. See the above manual for instructions
on installing Memory Manager and Mono on linux.

All in all, if you can update your sketch, I say its worthwhile.

Joe
KN4OND




I tried to compile the kd8cec sketch on the ide and it came up with an error - arduino.h not found

where can i download this file

also what is the advantage of the kd8cec sketch over the ashaar farnum sketck

73 de terry gm4dso



Re: kd8cec sketch

Jack, W8TEE
 

If you installed the IDE correctly, you should have the arduino.H header file in the IDE's root directory below:

    hardware\arduino\avr\cores\arduino\Arduino.h

Also note that C is a case-sensitive language, so arduino.h is not the same as Arduino.h. Your statement shows lower case which may not work. (I think I saw somewhere there is an arduino.h, but I'm not sure.)

Jack, W8TEE


On Saturday, August 25, 2018, 10:12:41 AM EDT, terryhugheskirkcudbright via Groups.Io <terryhugheskirkcudbright@...> wrote:


I tried to compile the kd8cec sketch on the ide and it came up with an error - arduino.h not found

where can i download this file

also what is the advantage of the kd8cec sketch over the ashaar farnum sketck

73 de terry gm4dso


Re: Homebrew from scratch #ubitx

Ben Holmes
 

I've been trying to get a PCB from Peter's Gerber files, I'm assuming a 6x6in PCB - but the Gerber files are unreadable by the company I paid... I'm presuming a version error in the Gerber files. Anyone have ideas for free software that can import a Gerber file?

I'd hate to start from scratch - knowing that others have already done the work - but it may come to that...  I'm not experienced in creating PCB's...


kd8cec sketch

terry hughes
 

I tried to compile the kd8cec sketch on the ide and it came up with an error - arduino.h not found

where can i download this file

also what is the advantage of the kd8cec sketch over the ashaar farnum sketck

73 de terry gm4dso