Date   

Re: Ubitx V3 Please Help, ANTENNA Pins on PCB have SHORTED no Receive #ubitx #ubitx-help

Bill Cromwell
 

Hello Fabian,

If you trace the circuit from the antenna it will lead you through several relay contacts to an inductor to ground. That is a piece of wire that wraps around and around with or without a core. Your meter uses direct current to measure resistance and continuity. Direct current sees any inductor as a plain old piece of wire - a short. So it sees that inductor to ground as a dead short. At RF frequencies however, it is NOT a short. Most - maybe all - radios will have this:) So you should continue looking elsewhere for the problem.

Have you completed the "alignment" steps? If the oscillators are far off frequency the radio will not work very well if at all. Do you have a more experienced ham there who can help you?

Fabian, we all have or had different 'starting' places. It is not reasonable to assert that a kit is not for a beginner! At one time if hams did not make their own radios from scratch (not even a kit) they had no radio at all. The uBitx is not really so much of a kit. Building your own gear from scratch or from a kit is 'learning by total immersion'. Sometimes that method can seem frustrating but eventually we all get where we want to be. Just relax and enjoy the 'journey'. After you have finally sorted out the trouble and corrected it you will find it more satisfying than that Kenwood or Yaesu:) Those have their own rewards and can be an appropriate starting place for somebody else.

I started out building radios from a pile of old junk harvested from dead radios. At times it was discouraging but in the end it doesn't seem to have hurt me:)

And now about your English. Your English is very usable for a non native English user. I know only a few German words and not very much about the grammar or syntax. If I was suddenly transplanted to Germany I would experience 'total immersion' and would soon be speaking, reading, and writing German. It would sometimes seem frustrating but eventually I would fit right in :) For now your English is substantially better than my German.

73,

Bill KU8H

On 08/25/2018 07:00 AM, sdr freak wrote:
Hello,

My Name is Fabian and 31 years old from Meiningen in Germany and a have
HAM Licence Class E since 5 Weeks and my English is not the best so i
hope you can forgive me my writing and spelling mistakes and can
unterstand my problem. I need really your help and i i really thankfully
for any help so i can cry when my Ubitx receive at one day..

I have not much money and a have many health problems so a have only a
little job and can't buy a Transceiver like a Yaesu or Icom in this
price class.. My big Dream was to have a little SSB Transceiver for 80m
and 10m, bescause in Germany with my HAM Class E onky 160m,80m,15m,10m
are allowed.

So a other HAM from my town sell a Ubitx and i was very lucky to think
for 130€ my big Dream was come true.. He says its the best for me and
not really difficult to construct, only little bit of soldering an than
i can have my QSO a few our later.. So i trust him because i think its a
friend, but he knows that i was a beginner of HAM.. I do not want to
blame him, only I am a bit out of tune because many said a kit was not
for a bloody beginner.

But now to my problem..

I have been trying to get the transceiver running for a month but
unfortunately without success. I have tried many things including the
updates of the CEC versions and the Ubitx version v4 but all you hear
are rushing and sounding like digital beeping. I've also tried the audio
NF chip, the TDA2822 is the version FCI and does not seem to be the
problem. Then I tried everything again with other antennas and also
outside to avoid disturbances of the house. but again no success.

By chance, I then checked everything for short circuits and suddenly I
see with the continuity tester, the multimeter tester, between the 2
pins on the board where you connect the antenna cable, which has a short
circuit just these two !!! I did not know any further .. Then I was in
the Ubitx chat from the forum here and David said that's just not good
and that must be the error that I'm not receiving properly .. By the
way, thanks again to david if you read it, You are really nice and I
would like to say thank you again !!

that's exactly my big problem. I need urgently your help to repair the
antenna pin short circuit. I'm really really thankful for any help I can
do now or check something. or if it is possible that you had this error
before and know what needs to be repaired. I am really very sad to have
not had a single QSO for my test for ham... but maybe everything will be
alright, I always hope so...

I say thank you very much!

Best regards Fabian
--
bark less - wag more


Re: Ubitx V3 Please Help, ANTENNA Pins on PCB have SHORTED no Receive #ubitx #ubitx-help

Howard Fidel
 

Fabian:
If you look at he schematic, you will see that the antenna connects to T2 through the relays and a Low pass filter. It should present a DC short. However for RF this is OK since the transformer is normally not a short. If you could describe your problem in more detail maybe we can help you. Does your Raduino work? Do you hear any signals? Etc.

Howard
Quoting sdr freak <sdrfreak55@gmail.com>:

Hello, 
 
My Name is Fabian and 31 years old from Meiningen in Germany and a have HAM Licence Class E since 5 Weeks and my English is not the best so i hope you can forgive me my writing and spelling mistakes and can unterstand my problem. I need really your help and i i really thankfully for any help so i can cry when my Ubitx receive at one day..
 
I have not much money and a have many health problems so a have only a little job and can't buy a Transceiver like a Yaesu or Icom in this price class.. My big Dream was to have a little SSB Transceiver for 80m and 10m, bescause in Germany with my HAM Class E onky 160m,80m,15m,10m are allowed. 
 
So a other HAM from my town sell a Ubitx and i was very lucky to think for 130€ my big Dream was come true.. He says its the best for me and not really difficult to construct, only little bit of soldering an than i can have my QSO a few our later.. So i trust him because i think its a friend, but he knows that i was a beginner of HAM.. I do not want to blame him, only I am a bit out of tune because many said a kit was not for a bloody beginner. 
 
But now to my problem..
 
I have been trying to get the transceiver running for a month but unfortunately without success. I have tried many things including the updates of the CEC versions and the Ubitx version v4 but all you hear are rushing and sounding like digital beeping. I've also tried the audio NF chip, the TDA2822 is the version FCI and does not seem to be the problem. Then I tried everything again with other antennas and also outside to avoid disturbances of the house. but again no success.
 
By chance, I then checked everything for short circuits and suddenly I see with the continuity tester, the multimeter tester, between the 2 pins on the board where you connect the antenna cable, which has a short circuit just these two !!! I did not know any further .. Then I was in the Ubitx chat from the forum here and David said that's just not good and that must be the error that I'm not receiving properly .. By the way, thanks again to david if you read it, You are really nice and I would like to say thank you again !!
 
that's exactly my big problem. I need urgently your help to repair the antenna pin short circuit. I'm really really thankful for any help I can do now or check something. or if it is possible that you had this error before and know what needs to be repaired. I am really very sad to have not had a single QSO for my test for ham... but maybe everything will be alright, I always hope so...
 
I say thank you very much!

Best regards Fabian


Re: New version of TFT Touchscreen based VFO-BFO for uBitx

Jack, W8TEE
 

Costs vary greatly with larger displays. One reason is because many of the less expensive color displays push the display processing onto the main processor while others use the hardware on the board. Also, many displays either do not support touch screens or there are no third-party libraries for them. Some displays have less resolution than others.

The display we are using in our forthcoming JackAl board comes in either 5" ($34) or 7" ($44) size, uses the RS8875 via SPI, has 800x480 resolution, and uses capacitive touch:
Inline image
By pairing it up with the Teensy 3.6 µC with 1Mb of flash, 256Kb of SRAM, and clocked at 180MHz, we can do DSP that many other processors cannot. (The photo shows the SSB in GREEN and its choices of filters have selectable bandwidths of 1500, 1800, 2200 (selected), 3000, and a user-defined custom (Cust) bandwidth.) We also provide about a dozen free !/O pins to play with.

Our board will likely cost more ($30) than a Nextion display system, but we think its features and horsepower will bring a lot to the table.

Jack, W8TEE

On Saturday, August 25, 2018, 4:19:49 AM EDT, SP Bhatnagar <vu2spf@...> wrote:


Bob is right. There is some experimentation needed to use larger display. I have not tried any larger ones yet.

My main concern was cost, so never looked at larger displays. 

73s
SP Bhatnagar
Vu2spf


Ubitx V3 Please Help, ANTENNA Pins on PCB have SHORTED no Receive #ubitx #ubitx-help

sdr freak
 

Hello, 
 
My Name is Fabian and 31 years old from Meiningen in Germany and a have HAM Licence Class E since 5 Weeks and my English is not the best so i hope you can forgive me my writing and spelling mistakes and can unterstand my problem. I need really your help and i i really thankfully for any help so i can cry when my Ubitx receive at one day..
 
I have not much money and a have many health problems so a have only a little job and can't buy a Transceiver like a Yaesu or Icom in this price class.. My big Dream was to have a little SSB Transceiver for 80m and 10m, bescause in Germany with my HAM Class E onky 160m,80m,15m,10m are allowed. 
 
So a other HAM from my town sell a Ubitx and i was very lucky to think for 130€ my big Dream was come true.. He says its the best for me and not really difficult to construct, only little bit of soldering an than i can have my QSO a few our later.. So i trust him because i think its a friend, but he knows that i was a beginner of HAM.. I do not want to blame him, only I am a bit out of tune because many said a kit was not for a bloody beginner. 
 
But now to my problem..
 
I have been trying to get the transceiver running for a month but unfortunately without success. I have tried many things including the updates of the CEC versions and the Ubitx version v4 but all you hear are rushing and sounding like digital beeping. I've also tried the audio NF chip, the TDA2822 is the version FCI and does not seem to be the problem. Then I tried everything again with other antennas and also outside to avoid disturbances of the house. but again no success.
 
By chance, I then checked everything for short circuits and suddenly I see with the continuity tester, the multimeter tester, between the 2 pins on the board where you connect the antenna cable, which has a short circuit just these two !!! I did not know any further .. Then I was in the Ubitx chat from the forum here and David said that's just not good and that must be the error that I'm not receiving properly .. By the way, thanks again to david if you read it, You are really nice and I would like to say thank you again !!
 
that's exactly my big problem. I need urgently your help to repair the antenna pin short circuit. I'm really really thankful for any help I can do now or check something. or if it is possible that you had this error before and know what needs to be repaired. I am really very sad to have not had a single QSO for my test for ham... but maybe everything will be alright, I always hope so...
 
I say thank you very much!

Best regards Fabian


Re: New version of TFT Touchscreen based VFO-BFO for uBitx

SP Bhatnagar
 

Bob is right. There is some experimentation needed to use larger display. I have not tried any larger ones yet.

My main concern was cost, so never looked at larger displays. 

73s
SP Bhatnagar
Vu2spf


Re: Fried irf510s replaced but

ajparent1/KB1GMX <kb1gmx@...>
 

IF more watts on 20 than 40 either a relay is stuck or like a friend had the coils for
the 40M filter were plain wrong or got damaged from handling.

relay or coils or the associated caps for the coils.

L17, L18, L19 should have 14 turns(a turn is though the hole once), the bad radio
had noticeably less.

Allison


Re: Does anyone have an AGC/Click kit to sell?

 

I am interested in 2  AGC boards
Aug
AG5AT


Re: Fried irf510s replaced but

jfein2000@...
 

Yes Allison, thanks.  It had been working fine but a bit low on output   only about 4 watts on 40 meters but 8 to 10 watts on 20 meters.  So I am sure my connectors are all wired correctly.  My issue has to be in the board.

cheers 

Jeff


Re: Homebrew from scratch #ubitx

Brian Bowling
 

Building an Arduino Uno from "scratch".
https://www.youtube.com/watch?v=sNIMCdVOHOM

Brian
N8BDB


Re: µB K1 Relay, RF Side

Bill Cromwell
 

Hi,

I call that stuff solder-free solder! I always use eutectic solder or silver bearing solder. I have both. They will have to pry mine out my cold dead hands. By the way, who is "they" we so often refer to? Maybe we should make "they" use some of the solder-free solder <evil grin>.

73,

Bill KU8H

On 08/24/2018 04:36 PM, atouk wrote:
Had to replace my K1, also. A couple observations.

Lead free solder SUCKS for desoldering. Pre-wetting it with a little
60/40 makes it flow a bit easier onto solderwick.

If it happens once, it will probably happen again. The more you work a
board, the more likely a trace WILL lift, or a through-hole will
disappear. Instead of soldering in the replacement relay (which may or
may not fail again in the future), I used a dip socket. Before the
arguments against because of added lead capacitance, etc., it works, the
radio is happy with it, so I'm happy with it.


On 8/22/2018 9:43 PM, Arvo W0VRA via Groups.Io wrote:
Good Evening, All.

My K1 relay was getting intermittently sticky on TX, so I decided to
replace it. I used an AXICOM with the same pinouts as the stock
Hongfa. I'm not very good at desoldering and tore up some of the pads
on the board. A little finagling and everything on the DC side of the
relay seems to be working. The connections labeled TX on the schematic
are getting 12V, and the connections labeled RX are getting 12V when
they're supposed to and 0V when they're not supposed to.

But it's not transmitting. After studying the schematic for what
might be a problem with the new relay install, I'm wondering what's
the purpose of the RF side of K1? It appears that when T/R is off,
then the signal from the BNC connector center goes through K3 and
through K1 to the first set of filters, and so on. When T/R is high
(5V from the Raduino signalling for transmitting), then K3 disconnects
the received signal trace from the BNC connector. K1 grounds the
trace coming from K3. Is this to prevent transmission RF energy from
bleeding into C80, causing some potentially nasty feedback?

And what would this have to do with the rig not transmitting? The
antenna signal is getting into the receive section, because RX appears
fine. If I'd done something wrong and K1 wasn't interrupting the path
from K3, then it should transmit anyway?

Am I missing something?

It's possible I damaged one of the delicate toroidal transformers I
suppose.

Any ideas will be appreciated!

73,

Arvo
--
bark less - wag more


Re: uBitX SSB transmit oscillations on 40m only #ubitx

Bruce
 

Cured but not found; for some reason it no longer occurs event though I made no changes, just let it sit for a week while I did other things. I hope it does not reappear.


Re: New Group Specifically for "Homebrew Test Equipment"

jim
 


On Friday, August 24, 2018, 11:25:30 AM PDT, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:


I think an si5351 breakout board, a resistor network to combine two channels (some will want all three),
and a Nano with LCD and rotary encoder to program the si5351 with is about all you want.

Everything I do is longer than initially anticipated, it's the law:
    https://en.wikipedia.org/wiki/Hofstadter%27s_law

Jerry


Thanks ...Gotta go look at some numbers at least

Jim


Re: New version of TFT Touchscreen based VFO-BFO for uBitx

GM4CID
 

Hi Kevin,

SP may correct me but I believe the current sketch out of the box supports a screen resolution of 240 x 320 which may limit you to a 2.8 inch screen size maximum.
I have had a 3.5 inch 320 x 480 TFT working after adjustments to parts of the sketch. so it would not be impossible to use a 5 inch screen if you are prepared to tailor the sketch for that screen resolution.

73,

Bob


Re: Need New Raduino Board

N5KBP
 

My nano was socketed on the raduino board. I blew out one of the gpio pins and just soldered the headers to an extra nano, programmed it and plugged it in.
Marty

--
N5KBP


Re: Lead-free solder, regular solder

Ian Reeve
 

Agreed, lead free solder is fine I am sure in the commercial world where pcbs are float soldered, but for home use,good old fashioned multicore solder (with flux cores within the solder) is perfect. Bought lots of the stuff from Radio Rallies/Hamfests before it became scarce 7 expensive. I have several sizes and a selection of suitable chisel tipped soldering irons to do the work.I generally find adding just a bit of new solder to a joint makes removal easier and always use a solder sucker.

 

Ian M0IDR

 

Sent from Mail for Windows 10

 


From: BITX20@groups.io <BITX20@groups.io> on behalf of Jack Purdum via Groups.Io <jjpurdum@...>
Sent: Friday, August 24, 2018 9:44:21 PM
To: BITX20@groups.io
Subject: Re: [BITX20]Lead-free solder, regular solder
 
Our experience is that lead-free solder also causes soldering tips to wear out much faster than regular solder. Al (AC8GY) corroded a tip into oblivion in less than a week of use. My favorite: 0.022" 62/36/2 by Radio Shack. You can still buy similar stuff on eBay.

Jack, W8TEE

On Friday, August 24, 2018, 4:36:33 PM EDT, atouk <atouk@...> wrote:


Had to replace my K1, also.  A couple observations.

Lead free solder SUCKS for desoldering.  Pre-wetting it with a little 60/40 makes it flow a bit easier onto solderwick.

If it happens once, it will probably happen again.  The more you work a board, the more likely a trace WILL lift, or a through-hole will disappear.  Instead of soldering in the replacement relay (which may or may not fail again in the future), I used a dip socket.  Before the arguments against because of added lead capacitance, etc., it works, the radio is happy with it, so I'm happy with it.


On 8/22/2018 9:43 PM, Arvo W0VRA via Groups.Io wrote:
Good Evening, All.

My K1 relay was getting intermittently sticky on TX, so I decided to replace it.  I used an AXICOM with the same pinouts as the stock Hongfa.  I'm not very good at desoldering and tore up some of the pads on the board. A little finagling and everything on the DC side of the relay seems to be working. The connections labeled TX on the schematic are getting 12V, and the connections labeled RX are getting 12V when they're supposed to and 0V when they're not supposed to.
 
But it's not transmitting.  After studying the schematic for what might be a problem with the new relay install, I'm wondering what's the purpose of the RF side of K1?  It appears that when T/R is off, then the signal from the BNC connector center goes through K3 and through K1 to the first set of filters, and so on.  When T/R is high (5V from the Raduino signalling for transmitting), then K3 disconnects the received signal trace from the BNC connector.  K1 grounds the trace coming from K3.  Is this to prevent transmission RF energy from bleeding into C80, causing some potentially nasty feedback? 

And what would this have to do with the rig not transmitting?  The antenna signal is getting into the receive section, because RX appears fine.  If I'd done something wrong and K1 wasn't interrupting the path from K3, then it should transmit anyway?

Am I missing something?

It's possible I damaged one of the delicate toroidal transformers I suppose.

Any ideas will be appreciated!

73,

Arvo


Re: Lead-free solder, regular solder

Jack, W8TEE
 

Our experience is that lead-free solder also causes soldering tips to wear out much faster than regular solder. Al (AC8GY) corroded a tip into oblivion in less than a week of use. My favorite: 0.022" 62/36/2 by Radio Shack. You can still buy similar stuff on eBay.

Jack, W8TEE

On Friday, August 24, 2018, 4:36:33 PM EDT, atouk <atouk@...> wrote:


Had to replace my K1, also.  A couple observations.

Lead free solder SUCKS for desoldering.  Pre-wetting it with a little 60/40 makes it flow a bit easier onto solderwick.

If it happens once, it will probably happen again.  The more you work a board, the more likely a trace WILL lift, or a through-hole will disappear.  Instead of soldering in the replacement relay (which may or may not fail again in the future), I used a dip socket.  Before the arguments against because of added lead capacitance, etc., it works, the radio is happy with it, so I'm happy with it.


On 8/22/2018 9:43 PM, Arvo W0VRA via Groups.Io wrote:
Good Evening, All.

My K1 relay was getting intermittently sticky on TX, so I decided to replace it.  I used an AXICOM with the same pinouts as the stock Hongfa.  I'm not very good at desoldering and tore up some of the pads on the board. A little finagling and everything on the DC side of the relay seems to be working. The connections labeled TX on the schematic are getting 12V, and the connections labeled RX are getting 12V when they're supposed to and 0V when they're not supposed to.
 
But it's not transmitting.  After studying the schematic for what might be a problem with the new relay install, I'm wondering what's the purpose of the RF side of K1?  It appears that when T/R is off, then the signal from the BNC connector center goes through K3 and through K1 to the first set of filters, and so on.  When T/R is high (5V from the Raduino signalling for transmitting), then K3 disconnects the received signal trace from the BNC connector.  K1 grounds the trace coming from K3.  Is this to prevent transmission RF energy from bleeding into C80, causing some potentially nasty feedback? 

And what would this have to do with the rig not transmitting?  The antenna signal is getting into the receive section, because RX appears fine.  If I'd done something wrong and K1 wasn't interrupting the path from K3, then it should transmit anyway?

Am I missing something?

It's possible I damaged one of the delicate toroidal transformers I suppose.

Any ideas will be appreciated!

73,

Arvo


Re: µB K1 Relay, RF Side

atouk
 

Had to replace my K1, also.  A couple observations.

Lead free solder SUCKS for desoldering.  Pre-wetting it with a little 60/40 makes it flow a bit easier onto solderwick.

If it happens once, it will probably happen again.  The more you work a board, the more likely a trace WILL lift, or a through-hole will disappear.  Instead of soldering in the replacement relay (which may or may not fail again in the future), I used a dip socket.  Before the arguments against because of added lead capacitance, etc., it works, the radio is happy with it, so I'm happy with it.


On 8/22/2018 9:43 PM, Arvo W0VRA via Groups.Io wrote:
Good Evening, All.

My K1 relay was getting intermittently sticky on TX, so I decided to replace it.  I used an AXICOM with the same pinouts as the stock Hongfa.  I'm not very good at desoldering and tore up some of the pads on the board. A little finagling and everything on the DC side of the relay seems to be working. The connections labeled TX on the schematic are getting 12V, and the connections labeled RX are getting 12V when they're supposed to and 0V when they're not supposed to.
 
But it's not transmitting.  After studying the schematic for what might be a problem with the new relay install, I'm wondering what's the purpose of the RF side of K1?  It appears that when T/R is off, then the signal from the BNC connector center goes through K3 and through K1 to the first set of filters, and so on.  When T/R is high (5V from the Raduino signalling for transmitting), then K3 disconnects the received signal trace from the BNC connector.  K1 grounds the trace coming from K3.  Is this to prevent transmission RF energy from bleeding into C80, causing some potentially nasty feedback? 

And what would this have to do with the rig not transmitting?  The antenna signal is getting into the receive section, because RX appears fine.  If I'd done something wrong and K1 wasn't interrupting the path from K3, then it should transmit anyway?

Am I missing something?

It's possible I damaged one of the delicate toroidal transformers I suppose.

Any ideas will be appreciated!

73,

Arvo


Re: New version of TFT Touchscreen based VFO-BFO for uBitx

Kevin Rea <reakevinscott@...>
 

Hi Bob, so does that type of screen come in a 5-inch screen that the software will support?


Bitx40/Ubitx for sale #bitx40 #ubitx

Robert Ray <rmray65@...>
 

All:  

I am liquidating all of my bitx stuff due to time constraints.  I have 3 for sale.

unbuilt bitx40, with some extra parts (no raduino) - 25$ plus shipping (US only)
mostly built bitx40, in lunch box.  needs some work.  - 45$ plus shipping (US only)
built, but not fully tested Ubitx - does include a few mods (RPP, extension programming cable, 4 pin hand mike)  in a metal case with fan.  130$ plus shipping  (US only)

Please contact me at 3402ray@....  I can send pics offline if interested.  PayPal is the method of payment.

Regards,
Robert/KD0YMC


Re: Thanks for the community and Mr. Bill Cromwell in particular...and check this 20m DX FT8 range #ubitx-help #ft8

_Dave_ AD0B
 

I manually upload the adi file to qrz. The file is well hidden in my windows 10 computer file system. The file you are looking for is wsjtx_log.adi You probably know that.

My internet connection is via satellite and a bit sketchy so I upload in batches.

I use PSKreporter.info, sometimes I have cqed a pskreporter monitoring station and had them come back to me. Helped with getting a 50 states certificate.