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Re: bitx20 problems #bitx20help

 

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Van: [email protected] <[email protected]> namens Ashhar Farhan <farhanbox@...>
Verzonden: zondag 18 augustus 2019 20:22
Aan: [email protected] <[email protected]>
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

 

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

 


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

 

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:
??

(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

 

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the diagram

bitx.gif

Re: bitx20 problems #bitx20help

 

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:
???

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

 

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

 

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

 

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

 

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?

 

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
CW Transmit Trouble #ubitxcw

 

Symptom: uBITX doesn't recognize the straight key. Electrically, the CW key line checks OK.
Solution: Go to settings->CW->Hand key[Select]
bitx20 problems

 

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: ubitx s-meter swr-meter help #bitx20 #bitx40 #bitx40help #arduino #calibration

 

Adrian,

check out kd8cec video on his swr meter that connects to his standalone signal processor. I think that is the functionality you are trying to achieve? ?

The Nextion to sketch code is a little complex (basically kd8cec fills a buffer with commands and data and sends them to the nextion to do the work.) In the two nano configuration, both nanos are talking to the nextion which does the display at request of either nano. So you will want to look at the sketch in the ¡°standalone signal processor¡± not the sketch that is currently running on your ubitx at the moment. Perhaps you can lift some code there.?

You might also want to checkout how much memory you have left on the sketch you are currently running in you ubitx. I suspect that kd8cec went to the two nano configuration because he was running at of cpu power and memory.

Sorry I can¡¯t be of more direct help here!

73
Mark
AJ6CU
Re: Antuino support group opened -- early antuino question

 

I agree.
The nanoVNA cannot do all of the many things an Antuino can do,
and vice versa.? Nor does either one replace an inline SWR meter.

That said, the nanoVNA looks like a very nice addition to the toolbox.

Jerry


On Fri, Aug 16, 2019 at 02:07 AM, Gerry Kavanagh wrote:
Different use case, IMO. I have a NanoVNA, and it's great for measuring passive devices' S11 & S21 parameters, but for signal measurement (spectral purity, power level) it is useless. This is why I ordered the Antuino.
Re: VOX Issues to be aware of. Or, suspected new digital mode.

 

Tom,
lol
Snoring as a digital mode! I wonder if your brain in encoding some diagnostic information on the snore? Research funding?

I wonder if the voiced/unvoiced decision could be ripped from CODEC2? Maybe for a syllabic squelch for an hf receiver but probably too slow for a Vox on tx.

bob
wm6h
?
Re: VOX Issues to be aware of. Or, suspected new digital mode.

 

On Sat, Aug 17, 2019 at 07:47 PM, Tom, wb6b wrote:
https://youtu.be/TJSctUv5lUc?t=274
Th link did not get linked. Here is the linked link.
VOX Issues to be aware of. Or, suspected new digital mode.

 

Hi,

I don't if many people have added VOX to their uBitx, but here is a reason to be careful. Maybe a DSP VOX controller could be built to guard against accidental digital mode emissions. Kind of like the computer keyboard filters that were supposed to detect and reject keystroke when your cat walks across your keyboard. Wonder how well the narrow CW filters would work with this mode interfering.

Here is a video of a HAM trying to determine what this new digital mode is.?

https://youtu.be/TJSctUv5lUc?t=274

Tom, wb6b
Re: Narrow filter for CW #ubitxcw

 

Oh sorry, forgot to mention.

This is not an audio filter, but a second crystal filter chain on 4MHz while the CW wide and SSB filter is at 12MHz.

Alex
Re: Narrow filter for CW #ubitxcw

 

Hi all,

Jerry mentioned my efforts for a second filter for CW. Just to have an indication how it performs here is a link to a short youtube film



I am very happy with the result.

73, Alex
PA1FOX
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