Re: Inexpensive eBay Amplifier Kits
I've read some reviews on these and it seem the big difference between the $36 100w and the $18 70w is the 100w is on 16v and the 70w is 13.8v.. The heat sink for either is $8.?? They both need an low pass filter for the band you use it on.? Some people say they cannot wait to retire.? It is great for the first 2 years but I retired in 2010 so I might just build the 70w version for 20m, my favorite band.?? -- Lee - N9LO? "I Void Warranties"
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I am a little hard of hearing, due to a divorce.
I bought this amp?
12 bucks? and works great.? I have it at half volume on the amp pot.
Vern
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I don¡¯t think you can go wrong by inserting a fixed value resistor between the diodes of something like 47 ohms¡ ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Ashhar Farhan
Sent: Tuesday, July 10, 2018 10:29 AM
To: [email protected]
Subject: Re: [BITX20] ubitix v4 ? raj, is there any other way of increasing the quiescent current by just changing the value of components? that might be an easier mod. something that i can even ask the production to do. ? On Tue, Jul 10, 2018 at 11:31 AM, Raj vu2zap <rajendrakumargg@...> wrote: The volume increases a lot if you do the quiescent current adjust mod that I have
described before.
Cut track between D15 and D16.. solder a multiturn vertical preset between the
two diodes and zero the preset resistance and slowly increase the preset till
the volume of background noise stops increasing. Check if final audio transistors
are hot, if hot reduce the preset..
Raj
At 10-07-18, you wrote:
>My v4 ubitx has low audio if I try to use a speaker, with headphones it is reasonable.
? -- ¡_. _._
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Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up
A. Same features but different resolution on standard Nextion displays.? I have 3.2(400*240) and 7 inch (800*480) cheaper and works as well as my E version
The "E" versions have more memory, real time clock with battery slot and faster? - cost more.
I find my 7 inch standard display? response is as fast as my 3.2 E? ?- At least I cant see any difference?
Both types work well,? mostly its a matter of personal choice and what resolution you want
Joe VE1BWV On Tue, Jul 10, 2018 at 7:32 PM Richard Spohn < wb2gxm@...> wrote: I am on the verge of purchasing one of the Nextion displays....2
questions:? A) are there more KD8CEC "features" on the bigger
displays, or are the bigger displays just larger versions of the
smaller; and B) is the enhanced version desirable, as for the
real-time clock and bigger flash memory?? Thanks - Rich WB2GXM
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Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up
I am on the verge of purchasing one of the Nextion displays....2
questions: A) are there more KD8CEC "features" on the bigger
displays, or are the bigger displays just larger versions of the
smaller; and B) is the enhanced version desirable, as for the
real-time clock and bigger flash memory? Thanks - Rich WB2GXM
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Re: Determine best values of VFO_A and VFO_B
VFO A &? B does not matter.? Those are just where the frequencies are when you tune a station.??
The other ones are what you need to adjust .Those values should not be zero.? Hopefully you saved the original program and can load it back in.? Then do the recalibration.? If not try to find a strong station of a known frequency such as a local AM broadcast if nothing else.
On Tue, Jul 10, 2018 at 3:54 PM, Bob Shaw <ve3suy@...> wrote: I am currently using 1.080 sketch and MM 1.081 on a WIN10 PC.
Can anyone explain how to determine the original values of VFO_A and VFO_B that may have been accidentally changed? I believe this accidental change may have?reduced the uBitX sensitivity greatly (or are the bands really this bad)!? Currently, these values are decimal 26, 211, 53, 00 and 16, 62, 17, 00 In my?uBitX.
I wonder if VFO_A and VFO_B are really only the current user VFO settings, and not really critical to the uBitX's?"magic numbers"? Or was the warning not to change these magic values referring to MASTER_CAL, LSB_CAL, USB_CAL and SIDE_TONE? Currently these values are set to all zeros in my uBitX. Perhaps these are the values I need to recalculate. I can't find enough information to decide what to do at this point.
Any help greatly appreciated.? ? ? ? ?Bob VA7SU
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Determine best values of VFO_A and VFO_B
I am currently using 1.080 sketch and MM 1.081 on a WIN10 PC.
Can anyone explain how to determine the original values of VFO_A and VFO_B that may have been accidentally changed? I believe this accidental change may have?reduced the uBitX sensitivity greatly (or are the bands really this bad)! ?Currently, these values are decimal 26, 211, 53, 00 and 16, 62, 17, 00 In my?uBitX.
I wonder if VFO_A and VFO_B are really only the current user VFO settings, and not really critical to the uBitX's?"magic numbers"? Or was the warning not to change these magic values referring to MASTER_CAL, LSB_CAL, USB_CAL and SIDE_TONE? Currently these values are set to all zeros in my uBitX. Perhaps these are the values I need to recalculate. I can't find enough information to decide what to do at this point.
Any help greatly appreciated.? ? ? ? ?Bob VA7SU
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Re: Bitx arduino reprograming
The red LED should not blink any more since you have replaced the Blink program with the Bitx program. Which software are you trying to load? I would suggest using the original Raduino software for the first try, as it requires no modifications to the system.
Jack, W8TEE
On Tuesday, July 10, 2018, 2:53:56 PM EDT, Elmar V?ller <dl2qa@...> wrote:
Doug,
first, I am appreciate your help very much.
now we repeat the procedure on my sons pc (win 10) and the upload was done very well on com 3¡ª
but next problem is that the display shows nothing.
red led on board doesnt blink anymore. Green led is on. Rx/tx led off.
you have any advice .?
73s
?
Gesendet:?Dienstag, 10. Juli 2018 um 15:29 Uhr
Von:?"Doug W" <dougwilner@...>
An:[email protected]
Betreff:?Re: [BITX20] Bitx arduino reprograming
Elmar,
None of us were born knowing how to do this.? I will try to explain with more detail to see if we can get you through this.? Let us first see if your computer is recognizing the nano.? This will help determine if you have the correct driver.
First go to your device manager.? In Windows 7 go to control panel, then systems and security, and finally device manager.? Most likely you will have one of the two situations described below.
Find a heading labeled Ports (COM & LPT).? Do you see Arduino Nano listed?? If so, write down the port number shown after it.
If you did find the Nano in that section you have the driver.? Now go to the Arduino IDE (the program you installed to compile and load sketches) and check the following under the Tools tab at the top:? For board make sure it shows Arduino Nano, select it from the list by clicking the arrow.? For port make sure it shows the port number you found in your device manager.? Once you have the board and port selected you should be able to upload the sketch.
If in your device manager the Nano does not show up under ports it is probably under Other Devices.? If that is the case you do need to install the driver.? That is also a relatively easy step but that will be for another post if you need it.
Let us know what you find.
--
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Re: Bitx arduino reprograming
Doug,
first, I am appreciate your help very much.
now we repeat the procedure on my sons pc (win 10) and the upload was done very well on com 3¡ª
but next problem is that the display shows nothing.
red led on board doesnt blink anymore. Green led is on. Rx/tx led off.
you have any advice .?
73s
?
Gesendet:?Dienstag, 10. Juli 2018 um 15:29 Uhr
Von:?"Doug W" <dougwilner@...>
An:[email protected]
Betreff:?Re: [BITX20] Bitx arduino reprograming
Elmar,
None of us were born knowing how to do this.? I will try to explain with more detail to see if we can get you through this.? Let us first see if your computer is recognizing the nano.? This will help determine if you have the correct driver.
First go to your device manager.? In Windows 7 go to control panel, then systems and security, and finally device manager.? Most likely you will have one of the two situations described below.
Find a heading labeled Ports (COM & LPT).? Do you see Arduino Nano listed?? If so, write down the port number shown after it.
If you did find the Nano in that section you have the driver.? Now go to the Arduino IDE (the program you installed to compile and load sketches) and check the following under the Tools tab at the top:? For board make sure it shows Arduino Nano, select it from the list by clicking the arrow.? For port make sure it shows the port number you found in your device manager.? Once you have the board and port selected you should be able to upload the sketch.
If in your device manager the Nano does not show up under ports it is probably under Other Devices.? If that is the case you do need to install the driver.? That is also a relatively easy step but that will be for another post if you need it.
Let us know what you find.
--
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Re: Nextion Displays >> warning
Link to files can be found at
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Re: NEXTION UPDATES FOR 7 AND 5 INCH - --ADAPTED FOR KD8CEC VER 1.095
Allen has had some computer issues. I am just finishing the 5 inch and 7 inch
I expect by end week we will both will be working solely on the 3.2 using the 1.095 updates. Maybe by the weekend.
Joe VE1BWV
Any idea when the Nextion 3.2 version for KD8CEC version 1.095 will be available?
Thanks for the work that you and Allen put in on this!
Bill
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Re: No CW Key Jack Wiring (Check My Work)
#ubitx
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Re: No CW Key Jack Wiring (Check My Work)
#ubitx
On Mon, Jul 9, 2018 at 11:11 am, Gary Anderson wrote:
Since it is going to the Wiki:? As is,? it might be a little confusing.? What you see as green, I see as yellow... and it's a 4.7K ohm resistor on the wire up diagram.
Thanks Gary!
I went back and forth if that was yellow or green. Even got out the desk magnifying light. Thanks for referencing the schematic for me I'll update the image before I put it on the wiki.
-W7PEA
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RTTY on the ubitx? Here's what I'm working on for my Icom 7300 and ubitx! Having fun listening to my 'diddle' while I work.
Ideas appreciated! I had an earlier version going with a PS/2 keyboard but RFI killed it. Trying different approaches now.
JI3BNB RTTY ENCODER for ARDUINO UNO <Simple Version> RTTY FSK and AFSK
2016.06.25 v3.1 Arduino Nano or mega2560
5BIT-BAUDOT-CODE, 45.45baud
LCD 16x2 (SC1602BBWB-XA-GB-G) or 20x4 (UC-204)
Works with HC-05 bluetooth on Serial with Android Bluetooth Terminal HC-05 program
Works with a USB to TTL converter connected to Arduino TX & RX and a PC terminal program (REALTERM)
Works with PC Arduino Serial Monitor serial port
7/10/18 Bo W4GHV (wn4ghv@...)
My THANKS to JI3BNB for 99% of this!
My slight P&M (Plaguarize & Modify) efforts are the rest!
Connect a speaker to pin 12 for neat sound effects
The digital FSK (and LED) are on pin 13
Needs backspace/erase function and a clear screen key
Scrolls OK, will only do 56 (2 line)or 64 (4 line) characters per message! Couldn't fix this!
Hardware interfacing to the Icom7300 and ubitx (http://hfsignals.com) $130 QRP XCVR is underway!
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Re: Nextion Displays >> warning
Wrote: Joe
I'd be interested in what you will do with all that real estate on the 7"!?
A waterfall/bandscope immediately comes to mind.? (Way beyond my skill set to implement)
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Re: Removing insulation from fine wires
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Re: NEXTION UPDATES FOR 7 AND 5 INCH - --ADAPTED FOR KD8CEC VER 1.095
Any idea when the Nextion 3.2 version for KD8CEC version 1.095 will be available?
Thanks for the work that you and Allen put in on this!
Bill
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Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up
Hi gang,
Got egg all over my face on this one! Been a tech and even taught electronics for the US Army for over 8 years before I retired from that career in 1981. Hooked this thing up, got all the software right but in the hookup to the Raduino's original display connector, I was off by 1 pin. I had power, ground and the Yellow (RX line to the Nextion) hooked where they were supposed to be. Had the TX line FROM the Nextion hooked to pin 5 of the Raduino's connector and since pin 5 on that connector is grounded on the Raduino, it's absolutely no wonder the uBITX could not receive commands from the Nextion!!!!
MY BAD!!!!! All is working as it should and the 3.2" display controls the rig just fine.
Amazing the problems a minor wiring error can cause when you are so sure you got it right that you don't re-check the connections!
Nice work on everything to all those who are involved in this project.
The only problem I can find is that the software is actually offsetting the CW Transmit carrier by the Sidetone frequency. This should actually leave the CW transmit carrier EXACTLY on the indicated frequency on the display. To properly use CW on any transceiver, the receiver frequency (not shown on the display though) should be moved into the filter's passband by the desired listening tone (usually the sidetone frequency). This has been the true way to do it ever since transceivers first came out (The Collins KWM-1 comes to mind). If you offset the transmit frequency, you wind up with two stations chasing each other either up or down the band depending on which sideband is used in CW receive. This COULD wind up with both stations walking right out of the band if they weren't watching what they were doing and that might get them in trouble with their respective governments.
I call on everyone writing firmware for the uBITX to take a close look at how they are implementing the CW vs Dial Frequency calibration. I think you will find that anyone having complaints of them not working right will find that the TX frequency is being offset rather than the RX.
Ron, W2CTX and I had this conversation early on in our development efforts for the W0EB/W2CTX firmware and though it took a while to convince Ron that it was the proper way to go, he came round and our calibration, when done according to the instructions will put the CW transmit frequency right on the money when you tune the received CW audio tone to match the uBITX sidetone setting. Of course not everyone (including me) has perfect pitch, so this might vary a few cycles due to individual hearing, but it will certainly be very close compared to the way it works out when the TX carrier is offset.
I've said my piece and I hope it gets the attention of Ashhar Farhan and Dr. Ian Lee as Ashhar's original software use TX offset for CW and so apparently does Dr. Lee.
Not meaning to be nasty to them, far from that. I have the interest of the entire ham community, especially CW operators that use the uBITX, in mind and the proper use of the mode.
Again, KUDOS to those developing the Nextion control - It appears to be working very well (now that I fixed my stupid wiring error).
Jim Sheldon, W0EB
(www.w0eb.com)
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------ Original Message ------ From: "Jim Sheldon" <w0eb@...> To: [email protected]Sent: 7/9/2018 2:47:20 PM Subject: Re: [BITX20] NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up I used the .hmi file and uploaded it from the editor. The .tft is the same file just already compiled and installed via the SD card. Either should be identical.
Jim
On Jul 9, 2018, at 2:17 PM, Mark M <junquemaile@...> wrote:
If the display is a Nextion and you loaded the TJC file (I assume you mean you loaded the tft file into the display), that might be the problem. I don't know the difference but I'd think there's a reason that there are two sets of files. FWIW, I have both a 2.4 and a 3.2 Nextion and both work fine with their respective tft files.
Mark AA7TA
On 7/9/18 10:42 AM, Jim Sheldon wrote:
New to the Nextion scene too, but I have had a 3.2" Nextion display for a while now and have been trying to make sense out of the editor. I think I finally have that figured out. I just loaded Ian's 1.095 software with the 3.2" TJC GUI. ...
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The LM386 can be improved. Here are some great mods to the chip we love to hate
Gordon,
The v4 audio works fine but a little low on gain. Farhan has inadvertently forgotten to add that extra component required.
The mod is extremely simple, anyone can do it. At low volumes you can distinctly hear the improvement and increase
in volume.
The change was made so that uBitx will not depend on chips that are obsolete or parts that may become..
I sincerely dislike the LM386!
Raj
At 10-07-18, you wrote:
>Raj, that is a solution, but isn¡¯t it fairly simple just to use a low parts count LM 386 amplifier for all this?? ?It seems to me that making such a widely available part work properly would be the better long-term solution, able to work with multiple output impedances, temperatures voltages etc.? Am I missing something? > On Jul 10, 2018, at 02:01, Raj vu2zap <rajendrakumargg@...> wrote: > > The volume increases a lot if you do the quiescent current adjust mod that I have > described before. > > Cut track between D15 and D16.. solder a multiturn vertical preset between the > two diodes and zero the preset resistance and slowly increase the preset till > the volume of background noise stops increasing. Check if final audio transistors > are hot, if hot reduce the preset.. > > Raj > > At 10-07-18, you wrote: >> My v4 ubitx has low audio if I try to use a speaker, with headphones it is reasonable. > > > >
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raj,
is there any other way of increasing the quiescent current by just changing the value of components? that might be an easier mod. something that i can even ask the production to do.
- f
On Tue, Jul 10, 2018 at 11:31 AM, Raj vu2zap <rajendrakumargg@...> wrote: The volume increases a lot if you do the quiescent current adjust mod that I have
described before.
Cut track between D15 and D16.. solder a multiturn vertical preset between the
two diodes and zero the preset resistance and slowly increase the preset till
the volume of background noise stops increasing. Check if final audio transistors
are hot, if hot reduce the preset..
Raj
At 10-07-18, you wrote:
>My v4 ubitx has low audio if I try to use a speaker, with headphones it is reasonable.
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Lee
MadRadioModder
Robert Ogburn
Jim Sheldon