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Date

Re: Power rails and breadboards

Jack Purdum
 

Most producers are consistent about the color scheme on breadboard. The blue line on the top in the photo below is the ground (-) rail and the red line is closest to the positive (+) rail. Obviously, check with an ohmmeter if your breadboard is a powered version.

Jack, W8TEE


On Wednesday, May 16, 2018, 9:20:08 AM EDT, N8DAH <Dherron@...> wrote:


yes top rail being GND bottom + Pos sorry I made it in a rush before work. R1 to radiuno power in.
--
David

?N8DAH


Re: Bitx40 turning clicks #bitx40

 

yes top rail being GND bottom + Pos sorry I made it in a rush before work. R1 to radiuno power in.
--
David

?N8DAH


Re: ND6T AGC implementation for uBIT-X

 

Oh dear me...


Re: Calibration - my approach #ubitx

 

Dave: Many thanks for your calibration post. I was able to load your data file to bring my uBitx back to life after screwing it up trying to perform the Cal using WWV. My radio is now about 30 Hz high. Have you or anyone figured out the relationship between the Master Cal numbers and frequency? as would like to adjust the 30 Hz frequency offset by manipulating the data directly.

73
N4AYE


Re: Testing my antenna #ubitx

 

If you are using the supplied electret capsule be sure you have the correct polarity, If it is reversed the audio will be very low. The negative side is connected to the case.


Re: ND6T AGC implementation for uBIT-X

 

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A wore jumper, eh?

Not quite sure which spelling checker interpretation to run with there :)

Bill, VK7MX/3


On 16/05/2018 6:34 PM, Nick VK4PLN wrote:

Hi Kees
A suggestion, if you are still designing the PCB, how about making it to fit flat on the uBitx board to the left of the LPF. It is easy to tap the RX RF there and keep the RF lines short, then an easy jumper to 12v RX close by to the south by R38... And a wore jumper over to tap audio from non relay side of R70?

Just a few thoughts..
73 Nick VK4PLN.


Re: New build

VE7CWS WRSeiler
 

Thanks John

I will try that, I have made several contacts mostly with established nets.?
The propagation is not so good and to make up for the lack of power I benefit from a 440 foot delta loop antenna at 85 feet AGL.

Cheers WRS


Re: Testing my antenna #ubitx

David Wilcox
 

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Have you listened on another receiver to see if you are putting out an intelligible signal?

Dave K8WPE

On May 15, 2018, at 10:18 AM, johnmbignell@... wrote:

I am getting Tx when I ?push the PTT.?I have a 17' vertical wire from QRP Guys antenna



The idea of making sure I have power first...ist a great suggestion. Will dig out my CB metre and see what I am getting.


Re: ND6T AGC implementation for uBIT-X

 

Here,


Re: ND6T AGC implementation for uBIT-X

 

Just next to the right of my HPF


Re: Bitx40 turning clicks #bitx40

 

Ok
I will try that rc filter. Thats the 2 caps from supply line to ground with the resistor inbetween in the supply line ?
Thanks


Re: ND6T AGC implementation for uBIT-X

 

Hi Kees
A suggestion, if you are still designing the PCB, how about making it to fit flat on the uBitx board to the left of the LPF. It is easy to tap the RX RF there and keep the RF lines short, then an easy jumper to 12v RX close by to the south by R38... And a wore jumper over to tap audio from non relay side of R70?

Just a few thoughts..
73 Nick VK4PLN.


Re: A friendly suggestion for Farhan.

Geoff Theasby
 

If a few watts isn't enough, build a linear kit. 45 watts for ?12.

Regards
Geoff, G8BMI

On 16 May 2018 at 08:50, Dgyuro via Groups.Io <dgyuro@...> wrote:
Isn¡¯t uBITX meant to be a QRP rig?? Some don¡¯t want more than 10 Watts for the challenge ?


On May 16, 2018, at 12:34 AM, iz oos <and2oosiz2@...> wrote:

I have built iler and Hendricks qrps and I have to say they all work well, but this is by far the best one. Monoband MFJ transceivers are very nice, SSB is pushed at the limits, but overall I prefer the Ubitx at a fraction of the cost. The thing audio is cleaner imho. There are not many low power HF transceivers, and none at that price level. So go on with the Ubitx, make the mods that increase easily the performance so that it may well become the newbies rig other than for the experienced hams.


Il 16/mag/2018 05:34, "John Smith via Groups.Io" <johnlinux77=yahoo.com@groups.io> ha scritto:
While observing, I have come to believe that the uBITX is a bit of a dud when it comes to power output on most bands, and CW which it is designed for. Too much hacking is required to make it usable, or worth the price. I would like to suggest the idea of individual band transceivers, with specially designed power amplifiers and band filters so a 10 meter BITX works as well as a 80 meter BITX. The Raduino code can be easily adjusted for each band the transceiver is made for, and remains familiar. I realize this would require retooling the factory a bit. But I do recall seeing old connections and silk screening on my BITX 40 where changes have been made. Perhaps some models could have options to populate the board with different filter configurations and finals too. I know you can't get everything on the same board, but maybe some could be dual band for ease of manufacture, or just popularity of use. I would love a BITX 80 or BITX 20 that could put out as much as 25 watts like my BITX 40. And with Allards code and minimal hardware upgrade the CW is wonderful and useful for digital modes too. I don't really mean to poop on your uBITX, but I don't want one at that price. But a $59.00 mono band, or $75.00 dual band transceiver that works well, sounds pretty good to me. Thanks for taking the time to read my opinion.



Re: A friendly suggestion for Farhan.

Dgyuro
 

¿ªÔÆÌåÓý

Isn¡¯t uBITX meant to be a QRP rig? ?Some don¡¯t want more than 10 Watts for the challenge ?


On May 16, 2018, at 12:34 AM, iz oos <and2oosiz2@...> wrote:

I have built iler and Hendricks qrps and I have to say they all work well, but this is by far the best one. Monoband MFJ transceivers are very nice, SSB is pushed at the limits, but overall I prefer the Ubitx at a fraction of the cost. The thing audio is cleaner imho. There are not many low power HF transceivers, and none at that price level. So go on with the Ubitx, make the mods that increase easily the performance so that it may well become the newbies rig other than for the experienced hams.


Il 16/mag/2018 05:34, "John Smith via Groups.Io" <johnlinux77=[email protected]> ha scritto:
While observing, I have come to believe that the uBITX is a bit of a dud when it comes to power output on most bands, and CW which it is designed for. Too much hacking is required to make it usable, or worth the price. I would like to suggest the idea of individual band transceivers, with specially designed power amplifiers and band filters so a 10 meter BITX works as well as a 80 meter BITX. The Raduino code can be easily adjusted for each band the transceiver is made for, and remains familiar. I realize this would require retooling the factory a bit. But I do recall seeing old connections and silk screening on my BITX 40 where changes have been made. Perhaps some models could have options to populate the board with different filter configurations and finals too. I know you can't get everything on the same board, but maybe some could be dual band for ease of manufacture, or just popularity of use. I would love a BITX 80 or BITX 20 that could put out as much as 25 watts like my BITX 40. And with Allards code and minimal hardware upgrade the CW is wonderful and useful for digital modes too. I don't really mean to poop on your uBITX, but I don't want one at that price. But a $59.00 mono band, or $75.00 dual band transceiver that works well, sounds pretty good to me. Thanks for taking the time to read my opinion.


Re: WANTED VK3YE LED LDR AGC diagram

 

Thanks Chris for the reply.

My question was how to integrate this AGC circuit on the BITX40 board.

I emailed Peter (VK3YE) and he gave me great response, but I wouldn't complain if I get more help.

Steve


Re: A friendly suggestion for Farhan.

 

I have built iler and Hendricks qrps and I have to say they all work well, but this is by far the best one. Monoband MFJ transceivers are very nice, SSB is pushed at the limits, but overall I prefer the Ubitx at a fraction of the cost. The thing audio is cleaner imho. There are not many low power HF transceivers, and none at that price level. So go on with the Ubitx, make the mods that increase easily the performance so that it may well become the newbies rig other than for the experienced hams.


Il 16/mag/2018 05:34, "John Smith via Groups.Io" <johnlinux77=[email protected]> ha scritto:
While observing, I have come to believe that the uBITX is a bit of a dud when it comes to power output on most bands, and CW which it is designed for. Too much hacking is required to make it usable, or worth the price. I would like to suggest the idea of individual band transceivers, with specially designed power amplifiers and band filters so a 10 meter BITX works as well as a 80 meter BITX. The Raduino code can be easily adjusted for each band the transceiver is made for, and remains familiar. I realize this would require retooling the factory a bit. But I do recall seeing old connections and silk screening on my BITX 40 where changes have been made. Perhaps some models could have options to populate the board with different filter configurations and finals too. I know you can't get everything on the same board, but maybe some could be dual band for ease of manufacture, or just popularity of use. I would love a BITX 80 or BITX 20 that could put out as much as 25 watts like my BITX 40. And with Allards code and minimal hardware upgrade the CW is wonderful and useful for digital modes too. I don't really mean to poop on your uBITX, but I don't want one at that price. But a $59.00 mono band, or $75.00 dual band transceiver that works well, sounds pretty good to me. Thanks for taking the time to read my opinion.


Re: A friendly suggestion for Farhan.

 

John,

The CW keying issue was purely a software problem. It has been fixed in the KD8CEC's firmware. You might want to try it.

- f

On Wed, May 16, 2018 at 11:22 AM, John Smith via Groups.Io <johnlinux77@...> wrote:
I have been here quite a while now, and learned many great things. I am aware that the uBITX is wildly popular. And the CAT rig control for it came about rather quickly compared to some other great useful hacks. But I have also seen power output charts from at least a few people here on this list indicating 10 watts at lower frequencies and 1 or 2 watts at higher frequencies, and disappointing CW performance with how it responds to keying. CW was one of it's biggest selling points. I feel too much work and money has to be invested into it after the initial cost to make it into something I would like. I would rather save my money and buy something else. That's just how I feel about it. And I feel that a dedicated band transceiver to begin with could have better overall performance, and would be popular with people who don't have or want an all band antenna. And thanks Jerry for not being too harsh with me. This list's reputation as being a hate group on other message boards and pages may need reassessing. I'll put in a good word for you on one of them somewhere.



Re: A friendly suggestion for Farhan.

 

John,

The ubitx is a learning platform and that comes with tradeoffs. One thing you can do is fix the keying by modifying the firmware in the arduino source and reuploading it. Or using the CEC software.

If you find the power output is lacking, one easy fix is to replace the PA capacitors with some that have a higher voltage rating than 25v and run the PA on 36 volts. That made a day and night difference for me and has made the ubitx much more enjoyable to operate, but you will need a real heatsink.

The thing with the ubitx is that it is not meant to be a commercial product. It is not competing with the likes of the big three. It is meant for you to learn on and to be able to modify into your own radio, built for you. It is meant to be cheap to repair. I don't think that I would try have the things on a big three radio that I am willing to tweak around with on my ubitx.

I run digital modes at 36v 1.35A for several minutes at a time. Thats pretty hard on any radio when you run it this hard thermally with the duty cycles I do, and considering the whole thing cost me around $145?to build. Its pretty darn good.

Look, the point I am getting at is this is a radio meant to get your hands dirty and teach you lessons that you are not going to learn on any other radio due to people not wanting to harm their more expensive rigs.

On Wed, May 16, 2018, 1:52 AM John Smith via Groups.Io <johnlinux77=[email protected]> wrote:
I have been here quite a while now, and learned many great things. I am aware that the uBITX is wildly popular. And the CAT rig control for it came about rather quickly compared to some other great useful hacks. But I have also seen power output charts from at least a few people here on this list indicating 10 watts at lower frequencies and 1 or 2 watts at higher frequencies, and disappointing CW performance with how it responds to keying. CW was one of it's biggest selling points. I feel too much work and money has to be invested into it after the initial cost to make it into something I would like. I would rather save my money and buy something else. That's just how I feel about it. And I feel that a dedicated band transceiver to begin with could have better overall performance, and would be popular with people who don't have or want an all band antenna. And thanks Jerry for not being too harsh with me. This list's reputation as being a hate group on other message boards and pages may need reassessing. I'll put in a good word for you on one of them somewhere.


--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist


Re: Core for Output Transformer

 

Jerry, does does that IRF impedance compare to the gate loading resistors? I assume the gate loading is dominant?

vk3pe


Re: A friendly suggestion for Farhan.

 

I have been here quite a while now, and learned many great things. I am aware that the uBITX is wildly popular. And the CAT rig control for it came about rather quickly compared to some other great useful hacks. But I have also seen power output charts from at least a few people here on this list indicating 10 watts at lower frequencies and 1 or 2 watts at higher frequencies, and disappointing CW performance with how it responds to keying. CW was one of it's biggest selling points. I feel too much work and money has to be invested into it after the initial cost to make it into something I would like. I would rather save my money and buy something else. That's just how I feel about it. And I feel that a dedicated band transceiver to begin with could have better overall performance, and would be popular with people who don't have or want an all band antenna. And thanks Jerry for not being too harsh with me. This list's reputation as being a hate group on other message boards and pages may need reassessing. I'll put in a good word for you on one of them somewhere.