Re: rough draft of how to connect BITX to PC for digital modes wiki
On Thu, May 17, 2018 at 05:45 pm, Doug W wrote:
AC9RZ
You're awesome Doug! I put this all into a wikli page and made a few layout edit, added pics. If you have pics of your final assembly or step by step, that would be great.
/g/BITX20/wiki/uBITX-Digital-Setup-by-AC9RZ
cheers!
W7PEA
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With the base software that the uBITX comes with, if you switch from VFO A to B the software will save the current frequency in memory and next time you power up it will use that last save value. The base base software only saves things if there is a specific event requiring something to be saved (such as changing VFOs).
Tom, wb6b
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When switch on a frequency 6.753. xxx,? allways appears and I have to retune to ham band. How to set 7.000 MHz (for example) to view after switch on? Thank you.
Ivo
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Re: #bitx40 #bitx40help bitx 40 Amateur radio kits world wide kit questions.
#bitx40
#bitx40help
I am not sure that sunil sells kits for the bitx40. I know that he does sell ubitx kits.
- f
On Fri, May 18, 2018 at 12:26 PM, <ShahanStuart@...> wrote: A little background
I was given a bitx 40 for a gift from my brother. I'm a tinckerer? by nature so this makes sense. However, electronics are kind of new to me.
Since this will be my first HF rig I opted to do a clean build. I ordered a model II case from amateur radio kits. The kit is cut to use a baofeng type ptt mic, the kit also has a gain control. It came with 10k pots x2, and a 100k pot. I. Not sure what pot goes where. I'm also not sure how to wire in the gain control. Can i get some guidance.?
Thanks for the help.
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Re: TDA2822 Smoke and FT8 Duty Cycle?
I use a RCA connector for it and this eliminates most of the shorts issues. Actually I always use RCA connectors for most of my low power homebrew stuff. The only thing I check is that the outer of the connector makes a ground connections and so far have not had any issues. I use it even for power plug connection and it seems it handles well the current for the Ubitx.
Il 18/mag/2018 22:45, "Ralph Mowery" < rmowery42@...> ha scritto: I put about a 5 ohm resistor in the wire coming from the ubitx going to the speaker jack just to try and eliminate that type of problem.
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Re: Low Power Output for Hendricks BitX20A - Watt meters and Scope readings do not agree....
#bitx20
I am definitely not running anywhere near 2A, so clearly 4.5 W is my output. ??
Driver bias at 20 mA. ?Finals biased to 50 mA each. ?I have plenty of drive and can reach the point where more drive provides no more power.
So what do I try to get the output power to double?
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Excellent job at removing the Nano. I too will probably be ordering the Raduino board from India because I am beginning to believe my issue is your issue.?
I did put together the BitX40 this evening. Right now its on a bare bones chassis and it has been functioning without a glitch for an hour or so. If it is still stable tomorrow I'll go online and find a nice enclosure for the radio.
I had been thinking that my UBitX's problem was restricted to the encoder because, supposedly, the boards are tested prior to being shipped. I am beginning to believe the testing in India may be restricted to the main board and not the Raduino.?
Any how, good luck with the replacement board and if I run into difficulty finding how to order one for my rig I will drop you a note asking for the specifics.?
I have yet to perform the voltage test on the Nano. I ran out of steam after the 40 meter rig was completed but I will make the test tomorrow. Incidentally, should the reading across the two pins be spot on 5 volts or is there some leeway?
Thanks again and best wishes,
Mike
On Fri, May 18, 2018, 11:42 PM kj6etl < pa1zz@...> wrote: It as a dearing undetaking but with some patience a hot soldering iron and solder sucker I was able to pull the Raduino from the board and solder the Generic Arduino Nano.
Before installing the new Nano I was able to compile the software but after I installed it its failing.
I tripple checked for shorts between the solder points but could not detect any. It was a good excersize in soldering but I am not going to waiste more time on this becuase by now I am sure the error is in the board that carries the Raduino. There is one on its way from India untill then the project is shelved...
 
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Did you check for a short from that function button wire to ground?
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On Fri, May 18, 2018 at 08:42 pm, kj6etl wrote:
It as a dearing undetaking but with some patience a hot soldering iron and solder sucker I was able to pull the Raduino from the board and solder the Generic Arduino Nano.
Before installing the new Nano I was able to compile the software but after I installed it its failing.
I tripple checked for shorts between the solder points but could not detect any. It was a good excersize in soldering but I am not going to waiste more time on this becuase by now I am sure the error is in the board that carries the Raduino. There is one on its way from India untill then the project is shelved..
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Re: Using IRF530 outputs and 2N3553 drivers in ubitx
Thanks..!!? Alison for the detailed analysis. Just to scratch the itch maybe I will hook up one in mid air with a 25:1 transformer at input and standard bifilar on drain.?
I once made 3x3 pushpull on IRF510 running at 30V for? 27.120Mhz ISM band freq got pretty decent 150W output. Input was on binocular core and output on stacked Mix 6 toroids.?
73
Rahul VU3WJM
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Re: Ashhar Farhan Inducted into CQ Amateur Radio Hall of Fame
Yeah in the same class as astronauts!
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It as a dearing undetaking but with some patience a hot soldering iron and solder sucker I was able to pull the Raduino from the board and solder the Generic Arduino Nano. Before installing the new Nano I was able to compile the software but after I installed it its failing. I tripple checked for shorts between the solder points but could not detect any. It was a good excersize in soldering but I am not going to waiste more time on this becuase by now I am sure the error is in the board that carries the Raduino. There is one on its way from India untill then the project is shelved...  
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Re: Help, can't change frequencies on uBitx
Check the voltage between the red and yellow wire is it 5V?
If so does the Raduino respond to the input when you push the button?
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Re: Using IRF530 outputs and 2N3553 drivers in ubitx
Well, according to the datasheet:
Input C 180 pF
Output C 81 PF
Reverse transfer C 15 pF.
So if we drive the gate, we have 180 +15(1+Av) pF
Av being the voltage gain.
If we drive the source, we have 180 + 81 pF so depending on the gain, the input capacitance is not hugely different in either configuration. However, you have the same current in the source as in the drain, so you need to supply all the current from the driver that appears in the output. Its much easier to drive the gate then the source. So Allison is correct in that the impedance would need to be very low, a step down transformer would be needed to drive the source and still a lot of current would be needed to drive the transformer. Pick your poison. I like the grounded source better.
Quoting Howard Fidel <sonic1@...>:
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Yes, but there is no Miller capacitance so the total is less.
Quoting Brian <vk4bap@...>:
Is the reason for not using power MOSFET's in grounded gate the high drain-source capacitance? Looking at the IRF510 datasheet it looks like drain-source capacitance is higher than gate-source. Have I read that correctly?
Brian VK4BAP
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Re: Ashhar Farhan Inducted into CQ Amateur Radio Hall of Fame
Congratulations!
But the nice part for us users?? We can now claim that we have
Hall of Fame radios!
Someone should design a decal...
On 5/18/2018 8:54 PM, Doug W wrote:
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congratulations OM
-------------------------------------------------------------------------------------
Announcing: 2018 Inductees, CQ Amateur Radio Hall of Fame
(Xenia, Ohio - May 18, 2018) - The CQ Amateur Radio Hall of Fame
has 11 new members for 2018, CQ magazine announced today. This
brings to 321 the total number of members inducted since the
hall's establishment in 2001.
The CQ Amateur Radio Hall of Fame honors those individuals,
whether licensed hams or not, who have made significant
contributions to amateur radio; and those amateurs who have made
significant contributions either to amateur radio, to their
professional careers or to some other aspect of life on our
planet. The 2018 inductees (listed alphabetically) are:
- Marlon Brando, FO5GJ (SK), iconic movie actor
- David Brown, KC5ZTC (SK), NASA astronaut killed in 2003
Columbia disaster
- Kalpana Chawla, KD5ESI (SK), NASA astronaut killed in 2003
Columbia disaster
- Laurel Clark, KC5ZSU (SK), NASA astronaut killed in 2003
Columbia disaster
-
Ashhar Farhan, VU2ESE, pioneer in popularizing
open-source Bit-X "semi-kits" using Arduinos for
affordable QRP transceivers
- Grady Fox, W4FRM (SK), SSB pioneer; worked on Manhattan
Project during World War II and the camera for NASA's lunar
landers
- Wendell King, ex-2ADD (SK), African-American pioneer of
broadcasting and college radio
- Fred Lloyd, AA7BQ, founder of , the most
widely-accessed amateur radio website
- Mark Pecen, KC9X/VE3QAM, wireless communication and
networking pioneer, inventor, cybersecurity expert
- Carole Perry, WB2MGP, longtime advocate for youth in amateur
radio; moderator of Dayton youth forum for more than 30 years
- Ed Westcott, W4UVS, photographer who chronicled the
Manhattan Project during World War II and later helped the FBI
with its investigation of the Jonestown massacre
Two new members each are also being inducted into the CQ DX and
Contest Halls of Fame at the respective Dayton DX and Contest
dinners. Their names will be announced separately.
CQ Communications, Inc. / 17 West John St. / Hicksville, NY 11801
USA / 516-681-2922
The world's premier independent amateur radio publisher.
Publishers of:
CQ Amateur Radio, CQ Books, the CQ Video Library
# # #
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Re: Ashhar Farhan Inducted into CQ Amateur Radio Hall of Fame
if it wasn't for your effort, none of us would be here
congratulations, you and you alone deserved it.? You led the way and we are following and benefiting from your work
Bill Franzwa K6SIK
On Friday, May 18, 2018 8:13 PM, Ashhar Farhan <farhanbox@...> wrote:
I didnt fail to notice that except for brando, all the others had a disaster in their lives :-) That said, I wish they had recognized the entire community here at the bitx20 for our movement. It usually so happens that recognition is heaped on one prominent member. This is for us all who keep these radios alive and growing. Let's get back to the irons, shall we?? - f
Farhan
That is pretty heady company you are keeping.? Congratulations on the hall of fame induction.
It is well deserved.
Arv? K7HKL
_._
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Re: Ashhar Farhan Inducted into CQ Amateur Radio Hall of Fame
I didnt fail to notice that except for brando, all the others had a disaster in their lives :-) That said, I wish they had recognized the entire community here at the bitx20 for our movement. It usually so happens that recognition is heaped on one prominent member. This is for us all who keep these radios alive and growing. Let's get back to the irons, shall we?? - f
Farhan
That is pretty heady company you are keeping.? Congratulations on the hall of fame induction.
It is well deserved.
Arv? K7HKL
_._
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Re: Using IRF530 outputs and 2N3553 drivers in ubitx
Yes, but there is no Miller capacitance so the total is less.
Quoting Brian <vk4bap@...>:
toggle quoted message
Show quoted text
Is the reason for not using power MOSFET's in grounded gate the high drain-source capacitance? Looking at the IRF510 datasheet it looks like drain-source capacitance is higher than gate-source. Have I read that correctly?
Brian VK4BAP
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Hello,
Sorry if I state the obvious, but you have to select the data entry line at the top of the serial monitor window to allow typing of command. The characters you type should show in that field.
73, John (VK2ETA)
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Re: Winlink configuration with the uBitx
Use the CEC firmware with Omni-Rig. Set Onmi-Rig for FT-817, 38400 baud, 8,N,1.? In WSJT-X, set PTT:CAT, MODE: USB, and Rig: OmniRig.
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On 5/18/2018 10:37 PM, Josh Walton via Groups.Io wrote: I was hoping to control the PTT vial the USB connection.
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Re: rough draft of how to connect BITX to PC for digital modes wiki
Ok, Thanks Doug, I'll go ahead and order the cable - just trying to save a couple bucks hihi
73, Dennis
W7DRW
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kj6etl
atouk