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Re: #ubitx. Increasing power output

 

Bo you got a place holder but no photo? kc2ipx

On Sat, Aug 18, 2018 at 11:07 AM, Bo Barry <bobarr@...> wrote:
Photos section


Re: ubitx manager

 

Here is the link for the latest uBITX Manager



On Sat, Aug 18, 2018 at 6:49 AM Ross Bell <bellrossjr@...> wrote:
Hi Guys:
I am looking for the newest version of the Ubitx manager and where to download it.
Thanks and 73 Ross Bell K7RSB

Re: uBITx intermittent cw transmit

 

If you are using the IDE to load the NANO make sure under "Tools" the "Processor:(OLD BOOTLOADER);

rOn

On August 18, 2018 at 11:22 AM Joe Milosch <zzmiloschxx@...> wrote:


On Fri, 17 Aug 2018 23:19:33 -0700
"jfein2000 via Groups.Io" <jfein2000@...> wrote:

Hi, I'm the other poster who had the same problem.
I think we have been given bad Raduinos. I'll tell you
why.

After making sure the voltage drops from 5v to 0
as the troubleshooting suggested, it still would not work.
Or it works intermittently as we both observed.

So I tried to upload the CEC software update, and my
Raduino's nano board refused to sync when uploading
the new sketch from the Arduino software.
I get the dreaded
"avrdude: stk500_getsync(): not in sync: resp=0x00"
message.

My linux logs show that the nano is seen on the usbtty0 port,
so I know my linux drivers are in order.

So, I think we have bad Raduinos. Mine says uBITX V4.3 and I bought
it in July 2018. We seem to have purchased around the same time.
Everything works except cw and software uploading.

So that is my observation. I won't be able to do
anything more until I can order a few new nano's to
test with. Unless the experts can suggest something.

I would suggest seeing if you can do a software
update on your Raduino's nano. If you can't, then that
may very well be the problem.... bad nanos.


Truly,
Joe





















I just posted this issue as well before I saw this message on topic. I have exactly the same problem. Voltage does drop to zero when contacts are closed. Has anyone been able to debug this issue if it is the Arduino? Thanks Jeff
Re: uBitX CW bandwith

 

Hello Mickael

Many thanks for your mail.?I also have a Sotabeam module filter (SSB/CW) that I was going to mount with an output LM386 module.?
Your editing shows that the LM386 is not absolutely necessary. I will try your solution.

I will let you know the result. I have a uBitx V3.

73 QRO? Gilles F1BFU / FR

Le?sam. 18 ao?t 2018 ¨¤?16:20, Michael Babineau <mbabineau.ve3wmb@...> a ¨¦crit?:
Derek :?

Regarding the SOTABEAMS DSP filters.

I have a couple of the dual-bandwith ones. The General filter (2.5Khz/300 Hz) is installed in my BITX40
and the CW filter (1khz/300Hz)? in my uBITX. Both are working very well. To others looking for a CW filter solution you, would be very hard
pressed to find an audio filter that works better than this, especially at this price. Performance far exceeds any analog audio filter I have ever used.



On the uBITX I removed the yellow wire from the AF Gain pot and connected that to the input of the filter. The output of the filter
is connected? back to the pot where the yellow wire was, via a series 0.1 uF capacitor (this is to isolate DC voltage present on the filter output).?
What I ended up doing in the end is using a?3PDT switch to switch the filter in and out and a separate SPST switch to toggle between WIDE/NARROW bandwidth.
The three poles on 3PDT are used to switch the filter input, filter output and supply voltage to the filter. BTW the filter is powered from 12V
via a small power-line filter (two 220uF electrolytic caps to ground with a series 12 Ohm resistor between them) to prevent any "garbage"
from getting back into the 12V supply (this is a precaution).??

You will want to install the signal LED as that makes a great tuning indicator. It will flash?on and off with the CW signal when a station
is tuned in close to the center of the filter bandwidth.?


By grounding RB12 on the filter board you can increase the filter gain. This doesn't actually increase the output of the filter, it decreases the
minimum signal required to?get full output from the filter. You might want to play with this to see which you prefer. I went with grounding it, as that allows a lower
setting of the AF Gain control when the filter is engaged and it sounded a lot better to me. This could be wired to yet another SPST switch?
to make it selectable.? It might be desirable to be able to unground RB12 to reduce the internal filter gain on very strong signals.?
I
don't have my uBITX in a permanent enclosure yet so I haven't decided if I will use a switch for RB12.?

Best of luck and let us know how you make out.?

Michael VE3WMB?

P.S. With a "brick-wall" audio filter like the SOTABEAMS DSP,? it is IMHO actually desirable to not have AGC or at least be able to turn AGC off.
Without AGC you don't get "AGC pumping" caused by a strong adjacent signal within the IF filter passband, but outside of the AF filter?
passband.?I have actually used my BITX40 in a few casual contests on CW and it works amazing well with the filter in the 300hz position.?

Re: uBITx intermittent cw transmit

Joe Milosch
 

On Fri, 17 Aug 2018 23:19:33 -0700
"jfein2000 via Groups.Io" <jfein2000@...> wrote:

Hi, I'm the other poster who had the same problem.
I think we have been given bad Raduinos. I'll tell you
why.

After making sure the voltage drops from 5v to 0
as the troubleshooting suggested, it still would not work.
Or it works intermittently as we both observed.

So I tried to upload the CEC software update, and my
Raduino's nano board refused to sync when uploading
the new sketch from the Arduino software.
I get the dreaded
"avrdude: stk500_getsync(): not in sync: resp=0x00"
message.

My linux logs show that the nano is seen on the usbtty0 port,
so I know my linux drivers are in order.

So, I think we have bad Raduinos. Mine says uBITX V4.3 and I bought
it in July 2018. We seem to have purchased around the same time.
Everything works except cw and software uploading.

So that is my observation. I won't be able to do
anything more until I can order a few new nano's to
test with. Unless the experts can suggest something.

I would suggest seeing if you can do a software
update on your Raduino's nano. If you can't, then that
may very well be the problem.... bad nanos.


Truly,
Joe





















I just posted this issue as well before I saw this message on topic.? I have exactly the same problem.? Voltage does drop to zero when contacts are closed.? Has anyone been able to debug this issue if it is the Arduino?? Thanks Jeff
Re: Need Help

[email protected]
 

Good morning Allison,

?

Thanks again for all your help!

?

I need some help with fine tuning the uBITX, I have a Grundig Satellite 750 receiver that I am using to find signals and then using my MFJ-1702B switch to send them to the uBITEX. I can hear something but can¡¯t tune it in clearly, I assume that I should be able to use the BFO to clean this up but need help with it¡¯s operation and set up.??Any suggestions?
Re: #ubitx. Increasing power output

Bo Barry
 

Photos section
Re: #ubitx. Increasing power output

Bo Barry
 

Thanks for the inputs! ?I'll try them.
I'll ?not just check power out, but also the voltages ?/signals with my scope. And for heat too.?
I'll put info on the nice socket pins in the files section.
Bo W4GHV?
Re: ubitx troubleshooting help - low power after irf510 replacement

 

I suspect those so-called IRF510's from Tayda are good enough if you plan to use them for their intended purpose.
Specifically, for use as low speed power switches.
To use an IRF510 at 10 or 20 mhz means it had better meet all the specs of the original part.
You want parts from a reputable top line vendor (Arrow, Mouser, Digikey, etc).
from a reputable manufacturer (these days that would be from Vishay).
?
Tayda is in the business of cutting costs on this stuff.
That means using clones.
And the clones sometime don't meet exactly the same spec's as the original parts.
The clones generally work, but not always.
Quality control can be less than ideal.

For example, there are reports of Nano clones that mostly work
but suck 4x the power that they should.
Or have a bad ADC input.?

I have bought stuff from Tayda, and have been happy with what I got.
But Tayda, at those prices, is not shipping the same stuff you would get from Mouser.

I would not consider buying RF semiconductors from other than first tier vendors.
Way more trouble than it's worth getting an RF amp to work with bad parts.
Can be trouble enough when using known good parts.?

Jerry


On Sat, Aug 18, 2018 at 07:17 AM, ohwenzelph wrote:
It would be nice to know what is and is not good from Tayda as they have low prices and low cost shipping.guress sometimes you git what you pay for...
A modern AD or SI5351/570 for an old dial !

 

Hi all, I am new here!

I would like to modify the rx of my Heathkit hw-7 , leaving the original front panel and case. I like to use a simple Quadrature switching mixer , thus, eliminating the common dc reciever hum, keeping the original analogue dial , feeding the existing af amplifier. Using a modern DDs or SI5351 or 570, replacing the existing variable tuning capacitor with a shaft encoder.
Any ideas please

Paul
9H1FQ
Re: uBitX CW bandwith

 

Derek :?

Regarding the SOTABEAMS DSP filters.

I have a couple of the dual-bandwith ones. The General filter (2.5Khz/300 Hz) is installed in my BITX40
and the CW filter (1khz/300Hz)? in my uBITX. Both are working very well. To others looking for a CW filter solution you, would be very hard
pressed to find an audio filter that works better than this, especially at this price. Performance far exceeds any analog audio filter I have ever used.

https://www.sotabeams.co.uk/audio-filters-and-more/

On the uBITX I removed the yellow wire from the AF Gain pot and connected that to the input of the filter. The output of the filter
is connected? back to the pot where the yellow wire was, via a series 0.1 uF capacitor (this is to isolate DC voltage present on the filter output).?
What I ended up doing in the end is using a?3PDT switch to switch the filter in and out and a separate SPST switch to toggle between WIDE/NARROW bandwidth.
The three poles on 3PDT are used to switch the filter input, filter output and supply voltage to the filter. BTW the filter is powered from 12V
via a small power-line filter (two 220uF electrolytic caps to ground with a series 12 Ohm resistor between them) to prevent any "garbage"
from getting back into the 12V supply (this is a precaution).??

You will want to install the signal LED as that makes a great tuning indicator. It will flash?on and off with the CW signal when a station
is tuned in close to the center of the filter bandwidth.?


By grounding RB12 on the filter board you can increase the filter gain. This doesn't actually increase the output of the filter, it decreases the
minimum signal required to?get full output from the filter. You might want to play with this to see which you prefer. I went with grounding it, as that allows a lower
setting of the AF Gain control when the filter is engaged and it sounded a lot better to me. This could be wired to yet another SPST switch?
to make it selectable.? It might be desirable to be able to unground RB12 to reduce the internal filter gain on very strong signals.?
I
don't have my uBITX in a permanent enclosure yet so I haven't decided if I will use a switch for RB12.?

Best of luck and let us know how you make out.?

Michael VE3WMB?

P.S. With a "brick-wall" audio filter like the SOTABEAMS DSP,? it is IMHO actually desirable to not have AGC or at least be able to turn AGC off.
Without AGC you don't get "AGC pumping" caused by a strong adjacent signal within the IF filter passband, but outside of the AF filter?
passband.?I have actually used my BITX40 in a few casual contests on CW and it works amazing well with the filter in the 300hz position.?
Re: ubitx troubleshooting help - low power after irf510 replacement

 



It would be nice to know what is and is not good from Tayda as they have low prices and low cost shipping.guress sometimes you git what you pay for...
ubitx manager

 

Hi Guys:
I am looking for the newest version of the Ubitx manager and where to download it.
Thanks and 73 Ross Bell K7RSB
Re: Raduino Clone kit from W0EB-N5IB #ubitx

 

Now that I've seen the difference between a uBITX Raduino and the BITX40 Raduino, I checked my stock and I can easily supply my Raduino Clone to the BITX40 users with the 5 pin "Molex" style plug to mate with the factoryt supplied connector to the BITX40's power & oscillators.?

The prices listed on my website would be the same for either the uBITX or BITX40 versions.? The only differences would be an unprogrammed NANO and the 5 pin header instead of the 16 pin right angle header for the BITX40 version - if interested, contact me via the link on the website and let me know which version you would like.

Jim Sheldon, W0EB

http://www.w0eb.com
Re: UBITX won't key

Joe Milosch
 

On Fri, 17 Aug 2018 23:08:03 -0700
"jfein2000 via Groups.Io" <jfein2000@...> wrote:

Hi, glad to hear I'm not the only one experiencing this problem.
I'm wondering if the ADC in the Raduino is programmed wrong in
the default software?


I'm going to try putting in the KD8CEC firmware (software) revision
and see if adjusting the ADC settings fixes it.

By the way, are you using a metal or plastic chassis? If plastic, what
are you using as a ground point? The schematic shows the yellow
wire from the Raduino (Raduino ground) also connected to chassis ground.
Maybe we are missing a proper chassis ground to the yellow wire?

Is the negative power input wire a suitable chassis ground?
Or is there a better ground connection point?

It almost seems like the intermittent cw happens because
the Raduino ground is floating around, sometimes triggering the ADC,
sometimes not.

Thanks,
Joe



Hi just finished assembly noting that the comments on connecting the keyer jack and I do have the resisitor and blue lead connected to the tip.? However the keyer does not key.? Intermittently it will begin sending di dah di dah etc and then stop but is not responsive to the key at all. I am currently trying it with a straight key.? Also doesn't seem to be any power output when it does send di dah.? Any suggestions would be much appreciated.

It tunes fine and I hear stations on the air although the audio is good, volume seems understated as well.

thanks

Jeff
Re: uBITx intermittent cw transmit

 

I just posted this issue as well before I saw this message on topic.? I have exactly the same problem.? Voltage does drop to zero when contacts are closed.? Has anyone been able to debug this issue if it is the Arduino?? Thanks Jeff
UBITX won't key

 

Hi just finished assembly noting that the comments on connecting the keyer jack and I do have the resisitor and blue lead connected to the tip.? However the keyer does not key.? Intermittently it will begin sending di dah di dah etc and then stop but is not responsive to the key at all. I am currently trying it with a straight key.? Also doesn't seem to be any power output when it does send di dah.? Any suggestions would be much appreciated.

It tunes fine and I hear stations on the air although the audio is good, volume seems understated as well.

thanks

Jeff
Re: ubitx troubleshooting help - low power after irf510 replacement

 

Here's a clue:
International Rectifier gave up on building IRF510's years ago.


On Fri, Aug 17, 2018 at 08:57 PM, Sean W7SKD wrote:
Here¡¯s how this ended up going: ?I saw no damage to any traces, no damage to any components really. I replaced the IR marked irf510s (sourced from Tayda) with Vishay Silconix marked irf510s (from Arrow) and everything is back to normal functioning. I don¡¯t know if the IR parts were actually ¡°bad¡± but they were certainly different.?
Re: ubitx compared to Elecraft or Xiegu for spurs #ubitx

 

Allison, Sunil and others,

I was involved in? design? of Anan transceivers. Getting the filters right did involve lot of work. Isolation, trace impedance and via size all contributed to filter response. PCB layout also had some impact on gain of PA chain across the HF bands to 6 mtrs. First production run boards came out after 3 iterations.
Another issue was getting a low and straight line on the noise floor upto 6 mtrs but that is another story.
?
Capt Sunil was first VU customer and he ended up paying more than the Dx cost for the radio.. the local VAT.??

Farhan visited me and was witness to LDMOS PA development.

Rahul VU3WJM
Re: ubitx troubleshooting help - low power after irf510 replacement

 

Here¡¯s how this ended up going: ?I saw no damage to any traces, no damage to any components really. I replaced the IR marked irf510s (sourced from Tayda) with Vishay Silconix marked irf510s (from Arrow) and everything is back to normal functioning. I don¡¯t know if the IR parts were actually ¡°bad¡± but they were certainly different.?

Pics of of the parts below - Vishay on the left?
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