Date   
Re: Reduced power on 40 meters. #ubitx #v5

ajparent1/KB1GMX <kb1gmx@...>
 

Brad,

In the past every time that issue has been seen it was the 40 low pass filter having
wrong components installed at assembly.  Other wise the issue would be evident
on other bands.

Generally the power goes down as one goes up from 80 through to 10M.
Nominally 40m should be less than 80 and more than 20.  This is assignable
to the power amp. 

If 40 is much lower than 20 then low pass filter or switching is broken.

Allison

Re: bitx20 problems #bitx20help

Ashhar Farhan
 

Dries,
I remember you mentioning that you had changed things around. The one you posted is exactly the original. Can you post your own version' diagram?
Second, what kind of equipment do you have to troubleshoot? Do you have access to an oscilloscope or an rf power meter?

- f


On Mon 19 Aug, 2019, 1:40 AM dries breughe, <driesbreughe@...> wrote:
the circuit is from the transceiver has already been posted and is on your own website.

here the circuit of the hf amplifier

Re: bitx20 problems

Curt
 

OM

hard to quickly resolve how many issues remain with your build.  on receive - I wonder if BFO is properly adjusted.  note this oscillator must be appropriately adjusted to mix the RF into the crystal filter to provide the correct audio. 

most everyone here is okay with buying a bitx or ubitx board from India, and wiring it up.  there are still modifications to consider.  if you must build a rig - I suggest visiting QRP-LABS.com. 

my ubitx is receiving as I type - and I confess to having a Yaesu but it has been off several days.

73 Curt

Re: Help #arduino

Curt
 

Senior OM

fine news on your successful build.  I think you refer to a larger LCD display?  there are 2 custom versions of uBITX software but I think they only work with color displays - others can correct me if I am wrong.  even if that display can connect to ubitx, the firmware will not likely support it. 

I use the simple 2 line LCD and it works nice enough. 

enjoy your ubitx and I hope to QSO

Curt WB8YYY

Help #arduino

co8pap@...
 

I am han radio from cuba. I build the Ubitx and working fine. The questions is 
I can use GLCD 32160 to put un my Ubitx

Re: bitx20 problems

Dexter N Muir
 

Ham since '07, building a Bitx20 in '12? OK, have you built simpler in between? That should have taught you the basics of troubleshooting and given you some basic test-gear.
A Bitx2o from scratch is NOT a beginner's project!
I'd recommend a careful perusal of SolderSmoke blog: Bill N2CQR in particular is a consummate builder, returning to the simple and re-starting just for the joy of it - and Pete N2CQW doing real advanced stuff, again for the joy of it. IIRC Bill built bitxes before Farhan's kits - merely as proof-of-concept.

73
Dex ZL2DEX

Re: VOX Issues to be aware of. Or, suspected new digital mode.

Tom, wb6b
 

On Sun, Aug 18, 2019 at 05:33 AM, bobolink wrote:
ripped from CODEC2
CODEC2 looks interesting. It seems to be a breath new life for older research and makes it work well thanks to modern DSP technology. The original researchers could not get past a certain technology point.

Well unless you have a government sized budget. 
https://commons.wikimedia.org/wiki/File:SIGSALY.jpg

If you think learning Morse Code is hard, imagine learning this keyboard. Maybe someone should come up with a Vocoder Code Tutor. Must have the lowest bit rate for any digital voice mode.
https://encyclotronic.com/synthesizers/misc-instruments/vocoder-r1258/

Probably could send voice at WSPR bit rates. Imagine that, voice WSPRing.

Looks like FreeDV (based on CODEC2) can be implemented with one of the more powerful STM32 processors, maybe one of the newer Teensy boards. Might be fun to add digital voice to the uBitx.
https://freedv.org

Well, if the snoring VOX issue cannot be solved, maybe just some kind of auto ID every 10 minutes to keep his transmissions legal.

Tom, wb6b

 

Re: bitx20 problems #bitx20help

dries breughe
 

the circuit is from the transceiver has already been posted and is on your own website.

here the circuit of the hf amplifier

Re: bitx20 problems #bitx20help

dries breughe
 


https://www.youtube.com/watch?v=NWi5he7hpZw
vfo van 4Mhz tot 4.350Mhz Je ziet dat ik de aan de tuning condensator draai. de vfo is niet overal proper. ik zoek nog naar de oorzaak.
www.youtube.com


Van: BITX20@groups.io <BITX20@groups.io> namens Ashhar Farhan <farhanbox@...>
Verzonden: zondag 18 augustus 2019 20:22
Aan: BITX20@groups.io <BITX20@groups.io>
Onderwerp: Re: [BITX20] bitx20 problems #bitx20help
 
Can you post a circuit diagram of your effort? Possibly with a picture of your build too? What kind of test gear do you have access to?

On Sun 18 Aug, 2019, 11:34 PM , <driesbreughe@...> wrote:
I have been a radio amateur since 2007.
over the years I have made many contacts worldwide  using comercile radios like ts-450 and ic-703.
because that is the easy way.
nevertheless, I always thought that was a bit of cheating, a shared honor with icom and kenwood.
there is a lot to be found on the internet concerning homemade transceivers.
on some websites you see diagrams, explanations, photos.
sometimes it all looks so simple.
like you just build the simple circuit and you're done.
But that is not my experience. sometimes I think it's a bad design or I'm just a stupid builder
in 2012 i started building the bitx20. clean with a printed circuit board that I had made.
it was many years and failed project, But now I  want to make an attempt to finish it
the receiver works, but not completely clean. I hear many mixing frequency products.
the recipient was deaf. in ssb they were only very strong stations. who came through it.
the transmitter: almost no carrier suppression
the pre hf amplifier (q14) functions as an attenuator.
i am not sure regarding the rf transformers. TV balun core is a vague description. Can it also function well with a ft37-43?
i also built the hf amplifier with  6   2n2018 transistors.
i used an hf oscilator (ne602 with a bit of external gain) to test the hf amplifier.
there was power gain, I had 250mW not the expected 5W
it is not specified which diode it must be.
I managed to get a 1N4001 in it
I hope you can give some advice in the hope of resolving technical issues.

Re: bitx20 problems #bitx20help

dries breughe
 



Van: BITX20@groups.io <BITX20@groups.io> namens Ashhar Farhan <farhanbox@...>
Verzonden: zondag 18 augustus 2019 20:22
Aan: BITX20@groups.io <BITX20@groups.io>
Onderwerp: Re: [BITX20] bitx20 problems #bitx20help
 
Can you post a circuit diagram of your effort? Possibly with a picture of your build too? What kind of test gear do you have access to?

On Sun 18 Aug, 2019, 11:34 PM , <driesbreughe@...> wrote:
I have been a radio amateur since 2007.
over the years I have made many contacts worldwide  using comercile radios like ts-450 and ic-703.
because that is the easy way.
nevertheless, I always thought that was a bit of cheating, a shared honor with icom and kenwood.
there is a lot to be found on the internet concerning homemade transceivers.
on some websites you see diagrams, explanations, photos.
sometimes it all looks so simple.
like you just build the simple circuit and you're done.
But that is not my experience. sometimes I think it's a bad design or I'm just a stupid builder
in 2012 i started building the bitx20. clean with a printed circuit board that I had made.
it was many years and failed project, But now I  want to make an attempt to finish it
the receiver works, but not completely clean. I hear many mixing frequency products.
the recipient was deaf. in ssb they were only very strong stations. who came through it.
the transmitter: almost no carrier suppression
the pre hf amplifier (q14) functions as an attenuator.
i am not sure regarding the rf transformers. TV balun core is a vague description. Can it also function well with a ft37-43?
i also built the hf amplifier with  6   2n2018 transistors.
i used an hf oscilator (ne602 with a bit of external gain) to test the hf amplifier.
there was power gain, I had 250mW not the expected 5W
it is not specified which diode it must be.
I managed to get a 1N4001 in it
I hope you can give some advice in the hope of resolving technical issues.

Reduced power on 40 meters. #ubitx #v5

n8yg
 

Hi, I have the ubitx V5 board, and have reduced power on 40 meters.

All other bands/frequency ranges  are fine. I am getting 10 or more watts out everywhere but 40 has about 6 watts.
At tp7 before the filters looking at it in the scope, it is reduced relative to other bands as well..so not output filter related.
Anybody run into this?
73
Brad N8YG

Re: bitx20 problems #bitx20help

Arv Evans
 


The original BITX:


Arv  K7HKL
_._


On Sun, Aug 18, 2019 at 12:35 PM Evan Hand <elhandjr@...> wrote:
Knowing that I might open a can of worms, here I go:

I have been monitoring this group for almost a year now, and have not seen any information posted on the original BITX20 during that time.  I also did a search on the files section and could not find information there, except on how to modify a BITX20 3 series to be multi band. Granted that I used BITX20 for the filter, and there may be a better choice.  Even the history document is not clear on what the early designs were for the BITX series.  I would assume that the design that you built is VFO controlled, rather than Si5351 based similar to the original BITX40 that later was modified to include the Raduino with Si5351.

There hopefully are others on the feed that did work with the original BITX20 that might make sense of your questions.  For me, I would need the schematics at least.  I would suggest that you point us to the information that you have on that original design so that we could make suggestions.

Alternatively, wait and hope someone that worked on the version that you built can chime in.


73 and hope someone can help you.
Evan
AC9TU

Re: bitx20 problems #bitx20help

Jerry Gaffke
 

Ah, I see that Farhan responded, you're in good hands.
The only problem I see is that he will tell you how easy it is.
Which for him, it is, as he has debugged plenty of these radios.

He might even enjoy dredging up a few dim memories from his distant youth:
  http://www.phonestack.com/farhan/bitx.html

(Having written that, did a quick check and found your post of the schematic.
Exactly the one from the webpage above, created some 25 years ago.)  

Jerry

Re: bitx20 problems #bitx20help

dries breughe
 

the diagram

Re: bitx20 problems #bitx20help

Jerry Gaffke
 

That's a very long list of trouble.
And  a rather old Bitx design.
Most folks in this forum are now using either the Bitx40 or the uBitx from hfsignals.com.

> sometimes it all looks so simple. like you just build the simple circuit and you're done.
> But that is not my experience. 


Radio circuits are seldom simple to get working well, especially if you don't have
a couple thousand dollars worth of test gear and 40 years experience with it.
And sometimes, even when you do.
Even for stuff considerably more simple than your Bitx20.
A complete superhet SSB transceiver is definitely not simple,
though the Bitx design is getting close to being as simple as possible.

I suggest you get a $59 Bitx40 working, that might prove challenging enough:
  http://www.hfsignals.com/index.php/bitx40/ 

If you really want to get this older Bitx20 working, you need to tell us which set of 
instructions you are working from, what you did different, where you had questions,
post a few photos, describe the test gear you have at hand, and a full description
of each problem as you take them one at a time.  Assume months, given your
initial description. And likely involve at least having a DVM and a 10mhz scope
(preferably better) and something like the Antuino available to help debug it.
Just getting the crystal filter to behave properly and the VFO stable enough
may prove to be significant "learning opportunities".

Jerry, KE7ER    Flora OR



On Sun, Aug 18, 2019 at 11:04 AM, <driesbreughe@...> wrote:

I have been a radio amateur since 2007.
over the years I have made many contacts worldwide  using comercile radios like ts-450 and ic-703.
because that is the easy way.
nevertheless, I always thought that was a bit of cheating, a shared honor with icom and kenwood.
there is a lot to be found on the internet concerning homemade transceivers.
on some websites you see diagrams, explanations, photos.
sometimes it all looks so simple.
like you just build the simple circuit and you're done.
But that is not my experience. sometimes I think it's a bad design or I'm just a stupid builder
in 2012 i started building the bitx20. clean with a printed circuit board that I had made.
it was many years and failed project, But now I  want to make an attempt to finish it
the receiver works, but not completely clean. I hear many mixing frequency products.
the recipient was deaf. in ssb they were only very strong stations. who came through it.
the transmitter: almost no carrier suppression
the pre hf amplifier (q14) functions as an attenuator.
i am not sure regarding the rf transformers. TV balun core is a vague description. Can it also function well with a ft37-43?
i also built the hf amplifier with  6   2n2018 transistors.
i used an hf oscilator (ne602 with a bit of external gain) to test the hf amplifier.
there was power gain, I had 250mW not the expected 5W
it is not specified which diode it must be.
I managed to get a 1N4001 in it
I hope you can give some advice in the hope of resolving technical issues.

Re: bitx20 problems #bitx20help

Evan Hand
 

Knowing that I might open a can of worms, here I go:

I have been monitoring this group for almost a year now, and have not seen any information posted on the original BITX20 during that time.  I also did a search on the files section and could not find information there, except on how to modify a BITX20 3 series to be multi band. Granted that I used BITX20 for the filter, and there may be a better choice.  Even the history document is not clear on what the early designs were for the BITX series.  I would assume that the design that you built is VFO controlled, rather than Si5351 based similar to the original BITX40 that later was modified to include the Raduino with Si5351.

There hopefully are others on the feed that did work with the original BITX20 that might make sense of your questions.  For me, I would need the schematics at least.  I would suggest that you point us to the information that you have on that original design so that we could make suggestions.

Alternatively, wait and hope someone that worked on the version that you built can chime in.


73 and hope someone can help you.
Evan
AC9TU

Re: bitx20 problems #bitx20help

Ashhar Farhan
 

Can you post a circuit diagram of your effort? Possibly with a picture of your build too? What kind of test gear do you have access to?


On Sun 18 Aug, 2019, 11:34 PM , <driesbreughe@...> wrote:
I have been a radio amateur since 2007.
over the years I have made many contacts worldwide  using comercile radios like ts-450 and ic-703.
because that is the easy way.
nevertheless, I always thought that was a bit of cheating, a shared honor with icom and kenwood.
there is a lot to be found on the internet concerning homemade transceivers.
on some websites you see diagrams, explanations, photos.
sometimes it all looks so simple.
like you just build the simple circuit and you're done.
But that is not my experience. sometimes I think it's a bad design or I'm just a stupid builder
in 2012 i started building the bitx20. clean with a printed circuit board that I had made.
it was many years and failed project, But now I  want to make an attempt to finish it
the receiver works, but not completely clean. I hear many mixing frequency products.
the recipient was deaf. in ssb they were only very strong stations. who came through it.
the transmitter: almost no carrier suppression
the pre hf amplifier (q14) functions as an attenuator.
i am not sure regarding the rf transformers. TV balun core is a vague description. Can it also function well with a ft37-43?
i also built the hf amplifier with  6   2n2018 transistors.
i used an hf oscilator (ne602 with a bit of external gain) to test the hf amplifier.
there was power gain, I had 250mW not the expected 5W
it is not specified which diode it must be.
I managed to get a 1N4001 in it
I hope you can give some advice in the hope of resolving technical issues.

bitx20 problems #bitx20help

dries breughe
 

I have been a radio amateur since 2007.
over the years I have made many contacts worldwide  using comercile radios like ts-450 and ic-703.
because that is the easy way.
nevertheless, I always thought that was a bit of cheating, a shared honor with icom and kenwood.
there is a lot to be found on the internet concerning homemade transceivers.
on some websites you see diagrams, explanations, photos.
sometimes it all looks so simple.
like you just build the simple circuit and you're done.
But that is not my experience. sometimes I think it's a bad design or I'm just a stupid builder
in 2012 i started building the bitx20. clean with a printed circuit board that I had made.
it was many years and failed project, But now I  want to make an attempt to finish it
the receiver works, but not completely clean. I hear many mixing frequency products.
the recipient was deaf. in ssb they were only very strong stations. who came through it.
the transmitter: almost no carrier suppression
the pre hf amplifier (q14) functions as an attenuator.
i am not sure regarding the rf transformers. TV balun core is a vague description. Can it also function well with a ft37-43?
i also built the hf amplifier with  6   2n2018 transistors.
i used an hf oscilator (ne602 with a bit of external gain) to test the hf amplifier.
there was power gain, I had 250mW not the expected 5W
it is not specified which diode it must be.
I managed to get a 1N4001 in it
I hope you can give some advice in the hope of resolving technical issues.

Re: another stuck relay in TX mode #ubitx #bitx20

Don - KM4UDX
 

Yes, with 16v to the finals I get a few more watts. At 80m with 16V and 25w there is 1.6 amps running around -- and maybe more with spikes here and there?

I've asked multiple folks on 80m (where I get the most watts) if they see any artifacts in my PSK signal (for example), and I get fine reports. I have seen wickedly over driven PSK signals with echos on the right and left of the PSK railroad tracks -- and I never want to send that out!!

I confess when I got my uBITX I was clueless oh how to monitor, adjust, and control my drive levels.  In the early days I'm sure I sent out a bunch of majorly over driven stuff. i'd like to go back in time and apologize to anyone who saw the mess I was sending, hahaha.  But, all I could say was...I'm sooo sorry I'm just learning how to figure out all this stuff.  And even the volume control took a while to understand. hahaha.

Don
km4udx

Re: Carrier suppression on uBITX v5 - -35 to -40 dB ok?

Don - KM4UDX
 

Tom+++

I built an little Easy digi interface kit with small transformers, DC blocking cap, to bridge the ubix audio i/o to the laptop audio i/o.  Then I realized by laptop audio i/o jacks were all broke, so I had to use a cheap external usb sound card just to gain good audio i/o jacks from the laptop. Going from uBITX audio i/o to EasyDigi i/o to cheap usb sound card dongle i/o to laptop usb port all worked 100% fine.

But.

Is the EasyDigi interface totally redundant given that I have to use a external sound card anyway?  I don't need the audio transformers for isolation -- the external sound card does that function, and nothing is bothered by the mic+v so  I don't need the blocking DC cap either.  Can I remove the EasyDigi from the audio i/o chain and go straight from uBITX audio i/o to sound card i/o??

Thanks oh wise ones for the insight and guidance!

Don