Date   
Re: Kit-Projects ND6T Ubitx AGC

KE2GKB
 

Let me start with my number I don't have fancy tabulated data but spinning around the bands i get anywhere from like .03 up to 2v when the local 100w station fires up. No signal generator to make comparable tests either sadly.

Just to triple check here. (I hate reddit markdown it butchers my emails)

7.101mhz on the Signal generator
USB mode on the ubitx
dial frequency on 7.100

That should be playing a 1khz tone out of the speakers/headset

The way i read your post you had the signal gen at 7.1 and the ubitx at 7.101 this would indeed put the tone in the LSB.

What does distorred/clipped mean? We are looking for something that is close to a DC control signal. It should be the audio amplified through a MMBT2309 then half wave rectified and smoothed.

-- Tim Keller - KE2GKB https://shop.kit-projects.com

Re: S Meter output sticking when changing tune step. #ubitx-help #smeter #ubitx

derek (G4VWI)
 

Thanks Tim, Digger and David. Your support is much appreciated especially from Kit-Projects.
Digger,I am using a miniature MIL Spec rotary switch for the Kit-Projects AGC board. No problems there. 
Playing with the settings using the memory manager I have got an acceptable response now.

However, I am going to try the last KD8CEC  Nextion firmware to see if that makes a difference. Strange this temporary freeze only happens when the tuning step is changed. I wonder if a second Nano will speed things up?

I used Murata T filters on the power leads and this has killed the motor noise but some mild "motor boating and ticks" can still be heard from the encoder on some frequencies. Have you put added caps on  7805 input side? Has this made any difference. Or perhaps a separate buck converter from the 12v input. Does that make a difference or not?

Sorting out a new "screened" wire loom for the AGC board and A7 connection now before researching how to set up a second Nano. I am not sure what firmware goes on the second board?

Best wishes Derek G4VWI.

Re: raduino for bitx 20

Jack, W8TEE
 

I'm sure the parts are okay, and I've used the Si5351 board and it works fine. I don't know about the display, especially if you plan on using the touch screen feature. The Raduino uses a Nano and I know that Dr. Lee has crammed a lot of features into it, but I think his code only works with the Nextion display which is an entirely different beast than the display you show. My display was driven by a Arduino Mega2560 Pro Mini, which has 256K of flash...big resource difference over a Nano. I would check with the vendor and ask what libraries are used for touch support and do a little research on any code you can find that uses that library.

Jack, W8TEE

Re: For Sale: uBITX v3

Bob Villa
 

Hi:

I would like to give home to this rig. PayPal is ready my address is a USA address.

Miguel

WP4ZI


On Sun, Apr 28, 2019 at 9:11, n5ib_2
<n5ib@...> wrote:
Selling my uBITX v3, fully assembled and working.
$125 shipped Priority Mail to a USA address

Main board unmodified except for installing a socket for the audio amp.
W0EB/W2CTX/N5IB "RadI2Cino" installed in place of factory Raduino
Socketed NANO
W2CTX/W0EB v3.00R firmware installed <http://www.w0eb.com/RadI2CinoI2C_Files/>
4-line White/Blue LCD I2C interfaced display
Mounted open-air, breadboard fashion for experimentation

inquire - off list please - n5ib (at) juno (dot) com

Jim, N5IB


Re: raduino for bitx 20

N7QL
 

Re: S Meter output sticking when changing tune step. #ubitx-help #smeter #ubitx

EI4GNB
 

my meter on my nextion 3.2 display does that sticky thing sometimes. it did it before i installed the KP AGC board, using the chip-socket mod on the uBitx website, so i think it's just a nextion thing.

I was able to get good levels to calibrate the S meter before i switched to the nextion also, i remember once i switched from the stock LCD it appeared to go a bit lazy. I was using CEC firmware on the stock LCD for a good while, and i never remember it sticking - ok the s-meter was tiny on the 16x2, so i guess i could have missed it sticking to be fair.

BITX40 code mods for TFT display

Jack, W8TEE
 

Hi Mike:

I haven't looked at this code for several years and I don't even know if it works, but it's better than starting from zero. A little explanation:  As you read the code, you will see messages in a C string array (array of pointers to char). Those are meant for sending pre-stored CW messages like you might use in a contest. They are tied to the 3 NO push-button switches you see on the top of the BITX40. You can also see message #1 displayed at the bottom of the TFT display. If you don't plan on using CW, deleting their references will free up some flash and SRAM space.

The code is Open Source, just leave the comments at the top of the file intact. I have no idea if the code works and just can't afford the time right now to answer questions about it...plus I've slept since I wrote it! Note: You must place both files in your working directory and the header file will have its own tab in the Arduino IDE.



Jack, W8TEE

On Sunday, April 28, 2019, 10:38:44 AM EDT, Mike Short <ai4ns.mike.spam@...> wrote:


Do you have details on implementing this on the bitx40? I am building one right now and would like to explore it. 

Mike
AI4NS 

On Sun, Apr 28, 2019 at 8:48 AM Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
I've used that display with the BITX40:

Inline image

and it works well. I've also made a VFO with the AD9850 that you mention (see March, 2016, QST). I can understand the addition of the display, but what's the purpose of the AD9850? If you're building from scratch, Farhan's design uses the multiple clocks from the Si5351, so that chip might be easier to "drop in" than the AD9850.

Jack, W8TEE

On Saturday, April 27, 2019, 11:59:50 PM EDT, N7QL <n7ql.us@...> wrote:


I am trying to figure out what arduino modules I need to build the raduino. I found this display https://www.ebay.com/itm/2-4-inch-TFT-LCD-Touch-Screen-Display-Panel-Shield-For-Arduino-UNO-R3-MEGA2560/132795546292.  I also found this DDS module. I assume I'd also need the UNO R3 Mega 2560 module also. Would these work well together? What modules are normally used for the Bitx kits?

Re: raduino for bitx 20

Mike Short <ai4ns.mike.spam@...>
 

Do you have details on implementing this on the bitx40? I am building one right now and would like to explore it. 

Mike
AI4NS 

On Sun, Apr 28, 2019 at 8:48 AM Jack Purdum via Groups.Io <jjpurdum=yahoo.com@groups.io> wrote:
I've used that display with the BITX40:

Inline image

and it works well. I've also made a VFO with the AD9850 that you mention (see March, 2016, QST). I can understand the addition of the display, but what's the purpose of the AD9850? If you're building from scratch, Farhan's design uses the multiple clocks from the Si5351, so that chip might be easier to "drop in" than the AD9850.

Jack, W8TEE

On Saturday, April 27, 2019, 11:59:50 PM EDT, N7QL <n7ql.us@...> wrote:


I am trying to figure out what arduino modules I need to build the raduino. I found this display https://www.ebay.com/itm/2-4-inch-TFT-LCD-Touch-Screen-Display-Panel-Shield-For-Arduino-UNO-R3-MEGA2560/132795546292.  I also found this DDS module. I assume I'd also need the UNO R3 Mega 2560 module also. Would these work well together? What modules are normally used for the Bitx kits?

Re: raduino for bitx 20

N7QL
 

Thank you Jack for letting me know that. I had read about the AD9850 for the Bitx somewhere online. I also read about the SI5351. I wish I could remember exactly where I read about the AD9850. I am definitely going to use the SI5351 then. 

Re: raduino for bitx 20

Jack, W8TEE
 

I've used that display with the BITX40:

Inline image

and it works well. I've also made a VFO with the AD9850 that you mention (see March, 2016, QST). I can understand the addition of the display, but what's the purpose of the AD9850? If you're building from scratch, Farhan's design uses the multiple clocks from the Si5351, so that chip might be easier to "drop in" than the AD9850.

Jack, W8TEE

On Saturday, April 27, 2019, 11:59:50 PM EDT, N7QL <n7ql.us@...> wrote:


I am trying to figure out what arduino modules I need to build the raduino. I found this display https://www.ebay.com/itm/2-4-inch-TFT-LCD-Touch-Screen-Display-Panel-Shield-For-Arduino-UNO-R3-MEGA2560/132795546292.  I also found this DDS module. I assume I'd also need the UNO R3 Mega 2560 module also. Would these work well together? What modules are normally used for the Bitx kits?

Re: Arduino modules for Bitx 20

Jack, W8TEE
 

I've used dozens of mcufriend displays and all work well. That said, I always get nervous when the ad does not specify the pixel size (e.g., 240x320). If nothing else, it tells me the vendor is just selling "stuff" and knows nothing about what he is selling. If they advertise that it is a touch screen, write to the vendor before you buy and ask what Arduino library they are using for the touch screen. The number of touch libraries that work are relatively scarce and some may work with capacitive touch while others only with resistive touch. If they know what they are selling, they should be able to tell you specifically which library they are using. Finally, you can use most TFT displays with a Nano, but you may need to resort to point-to-point wiring rather than making an Arduino sandwich with the Arduino and the display.

Jack, W8TEE


On Sunday, April 28, 2019, 12:09:41 AM EDT, N7QL <n7ql.us@...> wrote:


I am trying to figure out what arduino modules I need to build the raduino. I found this display https://www.ebay.com/itm/2-4-inch-TFT-LCD-Touch-Screen-Display-Panel-Shield-For-Arduino-UNO-R3-MEGA2560/132795546292.  I also found this DDS module https://www.ebay.com/itm/A401-AD9850-DDS-Signal-Generator-Module-0-40MHz-Test-Equipment-for-Arduino-YK/163426936824. I assume I'd also need the UNO R3 Mega 2560 module also. Would these work well together? What modules are normally used for the Bitx kits?

For Sale: uBITX v3

n5ib_2
 

Selling my uBITX v3, fully assembled and working.
$125 shipped Priority Mail to a USA address

Main board unmodified except for installing a socket for the audio amp.
W0EB/W2CTX/N5IB "RadI2Cino" installed in place of factory Raduino
Socketed NANO
W2CTX/W0EB v3.00R firmware installed <http://www.w0eb.com/RadI2CinoI2C_Files/>
4-line White/Blue LCD I2C interfaced display
Mounted open-air, breadboard fashion for experimentation

inquire - off list please - n5ib (at) juno (dot) com

Jim, N5IB

Re: Cant remember is I shared this

EI4GNB
 

some on ebay have fused inputs & outputs, which is nice..

Re: Resistor wattage

 

Jerry,

The R141 fails because of the 2219 near by. The ambient temperature
for R141 is made very high by the power transistor and a little more
dissipation causes it to fail.

The big blue round is 2N2219A directly south is R143 and slightly to the
left is R150. R141 is to the right of R143. If the TX is pressed long enough
the whole area turns red hot!

Emacs!

Raj


At 28/04/2019, you wrote:
I doubt very many Bitx40's have had R141 replaced,
only a few have reported this part to have failed.
Operating above 12.0v will improve your chances of seeing a failure here.

Another part that is dissipating more than it should is Q13,
replacing it with a through hole (not surface mount) 2n3904
should be sufficient.

Jerry, KE7ER


On Sat, Apr 27, 2019 at 09:02 PM, Adrian Chadd wrote:
is replacing that resistor a common mod for the bitx40?
 

Re: raduino for bitx 20

MVS Sarma
 

Once you have thought of using raduino, i suppose you could use one with nano and si5351. You could derive bfo and vfo also. On the bitx you could stop populating the crystal bfo, but use its buffer to amplify the raduino based .

In simple terms you could use bitx40 raduino changing the parameters to cover the band you need , for the bfo you decide upon.
Regards
Sarma vu3zmv



On Sun, 28 Apr 2019, 9:29 am N7QL <n7ql.us@... wrote:
I am trying to figure out what arduino modules I need to build the raduino. I found this display https://www.ebay.com/itm/2-4-inch-TFT-LCD-Touch-Screen-Display-Panel-Shield-For-Arduino-UNO-R3-MEGA2560/132795546292.  I also found this DDS module. I assume I'd also need the UNO R3 Mega 2560 module also. Would these work well together? What modules are normally used for the Bitx kits?

Re: Had audio, then no audio - looks like Q72 dead?

Mark Hatch
 

Thanks all for the encouragement.... So, yes that transistor was bad. I patched in a leaded part until the smt arrives from arrow this week. HOWEVER...

That wasn't the only problem.  I had a bad connection to my speaker and surprising, a bad pot for the volume control. Fixed all that, and the volume out the 16ohm speaker is adequate (not fantastic, but sufficient for me to think that a separate amp was unnecessary.

However, I still have an intermediate connection hanging around. If I squeeze the center of the top or bottom of the front of the enclosure, everything drops out. I suspect either a bad connection on the analog cable coming off the radiono or something else is grounding out. Should be easy, to find, but have not been able to duplicate it with the top off and pushing specific wires/boards....  I will eventually track it down.  ( I am using the front end board connection that amateurradiokits.in makes if someone has seemed something similar.

73
Mark
AJ6CU

Re: uBitx V5 Audio improvement

Ashhar Farhan
 

Yes, with diodes across the ep jack. This is to be done off-board.


On Tue 9 Apr, 2019, 12:04 PM Raj vu2zap, <rajendrakumargg@...> wrote:
Farhan,

For ear buds you should put a 100 ohms or so in series with the speaker output line. That will prevent blowing ears and ear buds!

Raj

At 09/04/2019, you wrote:
>LM386 distortion really increases with increased gain. gain is not sensitivity. a better idea might be to bypass pin 7 to ground with the 10 uf.
>either way, keep experimenting. I tried an external TDA2030 audio amp connected directly from the volume control. It can blow your ears if you are using earbuds, but it was really cool for speaker listening.




Re: Resistor wattage

Jerry Gaffke
 

I doubt very many Bitx40's have had R141 replaced,
only a few have reported this part to have failed.
Operating above 12.0v will improve your chances of seeing a failure here.

Another part that is dissipating more than it should is Q13, 
replacing it with a through hole (not surface mount) 2n3904 
should be sufficient.

Jerry, KE7ER


On Sat, Apr 27, 2019 at 09:02 PM, Adrian Chadd wrote:
is replacing that resistor a common mod for the bitx40?
 

Arduino modules for Bitx 20

N7QL
 

I am trying to figure out what arduino modules I need to build the raduino. I found this display https://www.ebay.com/itm/2-4-inch-TFT-LCD-Touch-Screen-Display-Panel-Shield-For-Arduino-UNO-R3-MEGA2560/132795546292.  I also found this DDS module https://www.ebay.com/itm/A401-AD9850-DDS-Signal-Generator-Module-0-40MHz-Test-Equipment-for-Arduino-YK/163426936824. I assume I'd also need the UNO R3 Mega 2560 module also. Would these work well together? What modules are normally used for the Bitx kits?

Re: Resistor wattage

N7QL
 

Thank you! Yeah with not the best vision I prefer through hole.