Raj, the price will go up, not come down. It will also be another thing for newbies to be confused about. For those who want to use a different audio amp, you have to just wire it up out of the volume control. It is as easy ss it gets even now. - f
Farhan,
What I would like to see uBitx become more hacker friendly. Please put
the audio on a daughter board
with a 0.1" pitch socket so we can plug in any chip or discrete home
brew board
Secondly daughter boards for the filter and the two bidi amps which I
call townships.
The mother board will shrink and be more hackable.
I guess that costs will come down a bit..
Raj
At 10-07-18, you wrote:
The LM386 can be improved. Here
are some great mods to the chip we love to hate
On Tue, 10 Jul 2018, 16:45 Raj vu2zap,
<
rajendrakumargg@...> wrote:
- 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
|
Re: Homebrew from scratch
#ubitx
In the attached ZIP file are the files for this PCB plus the schematic etc.
Please read the README file as this has information about the other files along with some notes about circuit changes etc.
I hope you find this useful.
73's
Peter M0HYT
|
Farhan,
What I would like to see uBitx become more hacker friendly. Please put
the audio on a daughter board
with a 0.1" pitch socket so we can plug in any chip or discrete home
brew board
Secondly daughter boards for the filter and the two bidi amps which I
call townships.
The mother board will shrink and be more hackable.
I guess that costs will come down a bit..
Raj
At 10-07-18, you wrote:
toggle quoted message
Show quoted text
The LM386 can be improved. Here
are some great mods to the chip we love to hate
On Tue, 10 Jul 2018, 16:45 Raj vu2zap,
<
rajendrakumargg@...> wrote:
- 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
|
Re: uBITX raduino no if output help please
whether the rig is in CW mode? ?If so, during Tx? only first oscillator works, cancelling 33MHz and 12MHz. See the ubitx? circuit description on hfsignals site. regards dsarma vu3zmv
On Wed, Jul 11, 2018 at 11:09 AM, vk3xl via Groups.Io <vk3xl@...> wrote: Hi Glenn, good to hear from you again. I get no RF of any sort from any pin on the raduino. The LCD appears to function normally. The 25mhz crystal is oscillating. Someone above suggested the nano may be dead. I will try a reflash and if its bricked then I will replace the nano.
--
Mike VK3XL
|
Re: uBITX raduino no if output help please
Hi Glenn, good to hear from you again. I get no RF of any sort from any pin on the raduino. The LCD appears to function normally. The 25mhz crystal is oscillating. Someone above suggested the nano may be dead. I will try a reflash and if its bricked then I will replace the nano.
--
Mike VK3XL
|
Thanks for the link. It looks like a really good article.
|
yeah Jeff had the same problem also this link should help you figure out how to calibrate it?
http://www.hamskey.com/2018/05/frequency-adjustment-of-ubitx-si5351.html
|
Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up
I have one of Sunil's cases and was looking at a way to use a Nextion without major butchering of the nice case. The 2.4" that I have looks like it might just barely fit...I measured the height of the display as about 43mm and the distance from the top edge of the front panel to the top of the jack labels is about 48mm. The 3.2" display is about 47mm high. Looks like either might fit but it would be close, if you don;t want to cover up the labels. A bezel would add some to the size of the display.
I have a second uBitX waiting to be assembled. I think I'll leave the first one in Sunil's case with the 16x2 display (altho I swapped it for white-on-blue version that I like better) and build the second one into another case that I can set up the way I like it.
Also, I believe that Sunil is planning to offer cases cut for some of the Nextion displays but I don't know how far along he is with that. Maybe he'll chime in here with more info.
Anyway, just some info that may be of use.
(We might want to start a new thread about this.)
Mark AA7TA
toggle quoted message
Show quoted text
On 7/10/18 7:20 PM, Richard Spohn wrote: Thanks Joe. I think the size of my display then, will depend on how
much space there is on the panel...I bought one of Sunil's cases, and
now I'm thinking I could mount the correct size of Nextion in a bezel
with bolts mounted on the back that are spaced to hold the Nextion to
the front of the case, covering the hole in it that was meant for the
16x2. That could work pretty nicely. ...
|
Hi crew --
I've noticed that I consistently have to tune +100 ppm in order to zero-beat WWV. In detail:
for both USB and LSB:
?5 000 kHz ->? 5000.050 actual tuning
10 000 kHz -> 10000.100 actual tuning
20,000 kHz -> 20.000,200 actual tuning
I do have CEC version 1.08 and a "master calibration" value of 138250.
If I'm +100 ppm as described above, should this value be +100; e.g. 138350?
I do find this frequency offset annoying. Definitely impacts audio.
See you on PSK31 or THOR8 :-)
Thanks
de Jeff AG7EW
|
After a lont time of using my Bitx40 with Allard's 1.09 firmware I decided today to upgrade to the latest version 1.27.7 No hardware modifications have been implemented except for the Function switch that was installed when switching to 1.09. With the new firmware (1.27.7) I cannot save my calibration. After I power OFF and again ON I get the same message, unit not calibrated, so I have to go through the steps of setting LSB calibration, USB calibration, VFO drive levels, etc. and the starting frequency is VFO A = VFO B = 7.1250 MHz. Initially I thought there was something wrong with the Nano (EEPROM issues), but reverting back to 1.09 everything is back to normal and the calibration values are retained. Any one had the same experience? What did you do to make it work? Do I need to make any hardware modifications in order to have the radio retain the calibration? Thank you in advance, -- Ion
VA3NOI
|
Farhan,
As the mad radio modder said put in a resistor and provide the through
holes for a trimmer if the
user wants to be able to fine tune it. 33-39 ohms is safe.
Raj
At 10-07-18, you wrote:
toggle quoted message
Show quoted text
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.
|
Re: Inexpensive eBay Amplifier Kits
You pays your money and you takes your chances.
Since I sold 20W+ Amp kits, I bought one of these to try it out and run some tests. The MOSFETs had the ID taken off with a grinder. The amplifier worked the first 4 times we powered it up and "went south" the 5th time with limited output. I did get a refund after working with eBay "for a while". The good thing is that they are improving and I'm glad to see them using the sleeve ferrites over copper tubes for the output transformer (#61 material ?). Question the linearity and if it's Class C (probably OK) or Class AB Linear.....and what the top end compression is. Any of these run better at 24V or 18V but I want a 13.8VDC Amp.
73 Kees K5BCQ? ?
|
Re: NEXTION DISPLAY UPDATES For KD8CEC ver 1.094 up
Thanks Joe. I think the size of my display then, will depend on how
much space there is on the panel...I bought one of Sunil's cases, and
now I'm thinking I could mount the correct size of Nextion in a bezel
with bolts mounted on the back that are spaced to hold the Nextion to
the front of the case, covering the hole in it that was meant for the
16x2. That could work pretty nicely. As for the enhanced version, I
think the RTC would be a nice thing to have, I like how it looks on
Ian's graphics (your graphics). Thanks for all the info! - Rich
WB2GXM
toggle quoted message
Show quoted text
On 7/10/18, Joe <joeman2116@...> wrote: 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 memor*y, *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
|
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"
?
|
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
|
I don¡¯t think you can go wrong by inserting a fixed value resistor between the diodes of something like 47 ohms¡ ?
toggle quoted message
Show quoted text
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.
? -- ¡_. _._
|
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
|
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
|
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
|
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
|
Raj vu2zap
AG7EW
Ion Petroianu, VA3NOI
Lee
MadRadioModder