...and my kids didn't think I could put it up myself!
-- Jack, W8TEE
|
Re: Templates for China EF01 Electronic Plastic Shell Project Case for a BITX40
I used some PCB for mine. Or you can go to a hardware store and get some aluminum and make a new panel. The steel one is hard to work with.?
mike
AI4NS
|
Re: ?BITX & QRP labs 50W PA
At $300 the HR-50 supports the uBITX on all bands and modes. And it does not require a PTT In signal since it has a carrier-operated relay:
John AE5X
|
By August, we didn't have any v4 boards. Can you send me a picture directly to my email address? - f
On Tue 17 Dec, 2019, 1:48 AM V Zecchinelli, < n1vin@...> wrote:
Jerry, Sarma, Gordon,
Wow, am I confused.? I purchased 12 August 2019 and I thought it was
a V5 however after Jerry's response I looked and it is a V4.? My bad
for not checking things better.? Live and learn.
I am using a stereo cable I bought on ebay cheap.? After
your responses I decided to check the 3.5mm connectors to see if
there could be a short there.? Well, there are only 2 wires in the
cable and shield and ring are connected together.? Lesson, don't buy
cheap cables on ebay.? I will order some quality stereo cables from
Amazon and see how things go.
Thank you so much for your responses.
Vince
On 12/16/2019 12:46 PM, Gordon Gibby
wrote:
Are you DC shorting out the output with a transformer in the sound
card??
On Dec 16, 2019, at 12:07, Jerry Gaffke via Groups.Io < jgaffke@...>
wrote:
I'd guess your USB soundcard cabling is somehow (almost)
shorting out the audio from that 2822 chip.
Look for a short.
Perhaps add an 8 or 10 ohm resistor in series with the
TDA2822 to protect it from shorts like that.
The TDA2822 amp was used on v3.
Some discrete transistors were used on v4.
On v5, as Sarma has stated, the trusty (crusty?) old LM386
was used.
If you have a TDA2822 chip installed, it is probably v3.
A search of the forum for 2822 will reveal that a few v3
uBitx boards went out
with a WX branded TDA2822.? This clone of the TDA2822 works
fine up to about 8v,
above 8v it can sometimes self destruct.? ?If you have a WX
branded TDA2822 on
your board, I suggest you get an NJM2073D ordered from a
reputable distributor
It is pin compatible with the TDA2822, works fine, good to
15v or so.
The original TDA2822 in the DIP package from ST is no
longer available,
though ST does still sell it in an SOIC.
There are a half dozen different makers of clone TDA2822's,
many of them work fine.
Some of the clones work ok but only with a maximum supply
voltage of around 6v.
With the WX TDA2822 clone operating at 12v in the uBitx, the
chip might work fine
for weeks and then suddenly decide to blow bits of silicon
across the room.
A fun bit of trivia from?
? "The
LM386 was invented by Ernie Leroy Long at Motorola in
1969. It was originally for part of a fuel injection
system for a Ford Car."
If true, I assume it went by a different name at the time.
I'm a bit suspicious, a google for "LM386 Ernie" gets many
copies of exactly the above phrase with no further
information or attribution.
The "LM" prefix suggests National Semiconductor, perhaps it
had a different name coming out of Motorola.
Jerry, KE7ER
?
On Mon, Dec 16, 2019 at 07:10 AM, V Zecchinelli wrote:
Good Morning,
I have a quick question on FT8 with uBitx V5 using USB
soundcard (7.1 Channel).? Even with the volume of uBitx set
very low the 2822 audio amp gets very hot and if volume set
over 1/4 it will fail catastrophically.? On phone I can
listen to the radio all day with no issues.? Seems odd.?
Anyone else seen this problem?
Thanks,
Vince
|
Re: ?BITX & QRP labs 50W PA
Allison, I am basing my report in wa2eby's recommendations. My own measurement lead me to believe that between 25 ma to 150 ma, there is not much of a?difference in linearity. The linearity increases only around 500ma. By then, we are roasting potatoes.
- f
On Tue 17 Dec, 2019, 3:22 AM ajparent1/kb1gmx, < kb1gmx@...> wrote: Farhan,
No its not.? You need to be more than 100ma to get sorta on the linear part of the IRF510 bias curves.
At minimum bias you are on the very curved part of the gate threshold curve and the IMD will be poor with
crossover distortion.? Also we are not switching as its linear from transistor to transistor its complementary.
?
---------------------------------
No direct email, it goes to bit bucket due to spam
|
Re: Brand new uBiTX v5.0 quality issue ?
Hi Ashhar, I agree with you.
I also wrote a serious email to hfsignals attaching several photos but they haven't given me any answer yet..
73's Diego
|
Re: Brand new uBiTX v5.0 quality issue ?
Couple of boards with me with broken pot leads.
If the pots are mounted a little higher above the pcb then they can be
twisted without problem.
Raj
At 17/12/2019, you wrote:
toggle quoted message
Show quoted text
i am treating this as a serious
quality issue. have others faced this too? by twisting the trimpots, the
tracks can potentially come off. please write to
hfsignals@... and ask for
a replacement.
- f
On Tue, Dec 17, 2019 at 3:32 AM Mike WA0YCN
<
mgassman@...> wrote:
- Diego,
- I got my board in early November and my trimmer was skewed as well. I
presume they turned it like that because they changed heat sinks and the
new ones go closer to the pc board than previous ones.?? Regardless,
I haven?€?t experienced any problems.?
- Just curious - my family is from Nervesa - where might you call
home?
- Mike
|
Re: Brand new uBiTX v5.0 quality issue ?
Hi Mike, thanks a lot for infos !?
Therefore it seems that it is only an aesthetic issue. it's not very nice to look at but if it works, that's okay.
I'm from Reggio Calabria, my city is right in front of Sicily island, in southern Italy. Nervesa is located in the north, about 1200km (780 miles) away.
73's Diego
|
Re: Brand new uBiTX v5.0 quality issue ?
i am treating this as a serious quality issue. have others faced this too? by twisting the trimpots, the tracks can potentially come off. please write to hfsignals@... and ask for a replacement.
- f
On Tue, Dec 17, 2019 at 3:32 AM Mike WA0YCN < mgassman@...> wrote: Diego,
I got my board in early November and my trimmer was skewed as well. I presume they turned it like that because they changed heat sinks and the new ones go closer to the pc board than previous ones.? Regardless, I haven¡¯t experienced any problems.?
Just curious - my family is from Nervesa - where might you call home?
Mike
|
Re: Nextion question from new member
Almost. R253 replaced by a 0.1 Mfd cap.
Philip G7JUR
|
Re: Nextion question from new member
Rick
The display choice indeed is a large factor in case selection. Use your favorite search engine to query ubitx enclosure,? and check out what's being used. I am using a case from amateurradiokits.in that many are happy with.
Your v5 is nice, no must buys required. Choose your display and go from there. I suggest powering up with the stock display first.
Curt
|
Re: Brand new uBiTX v5.0 quality issue ?
Diego,
I got my board in early November and my trimmer was skewed as well. I presume they turned it like that because they changed heat sinks and the new ones go closer to the pc board than previous ones. ?Regardless, I haven¡¯t experienced any problems.?
Just curious - my family is from Nervesa - where might you call home?
Mike
|
Re: ?BITX & QRP labs 50W PA
Farhan,
No its not.? You need to be more than 100ma to get sorta on the linear part of the IRF510 bias curves.
At minimum bias you are on the very curved part of the gate threshold curve and the IMD will be poor with
crossover distortion.? Also we are not switching as its linear from transistor to transistor its complementary.
?
---------------------------------
No direct email, it goes to bit bucket due to spam
|
Thanks Jerry,
I purchased from HF Signals website.? Board says 948/4.? I also have
a V3 labeled 0705/3.? The silkscreen on both boards says ubitx v3
(c) hfsigs.com, 2017.? On the V3 I had removed the WX chip and
installed a socket and TDA2822M.? I disassembled the V3 to use the
case for what I thought was a V5.
Thank you,
Vince
On 12/16/2019 3:31 PM, Jerry Gaffke via
Groups.Io wrote:
toggle quoted message
Show quoted text
A v4 with a TDA2822 chip driving the speaker/phones is still a bit
confusing.
v3 had the TDA2822
v4 had a couple discrete transistors in push-pull.
v5 has the LM386
Did you buy directly from hfsignals.com on Aug 12 2019?
Or some other vendor?
Jerry, KE7ER
On Mon, Dec 16, 2019 at 12:18 PM, V Zecchinelli wrote:
Jerry, Sarma, Gordon,
Wow, am I confused.? I purchased 12 August 2019 and I thought it
was a V5 however after Jerry's response I looked and it is a
V4.? My bad for not checking things better.? Live and learn.
I am using a stereo cable I bought on ebay cheap.?
After your responses I decided to check the 3.5mm connectors to
see if there could be a short there.? Well, there are only 2
wires in the cable and shield and ring are connected together.?
Lesson, don't buy cheap cables on ebay.? I will order some
quality stereo cables from Amazon and see how things go.
Thank you so much for your responses.
Vince
|
A v4 with a TDA2822 chip driving the speaker/phones is still a bit confusing.
v3 had the TDA2822
v4 had a couple discrete transistors in push-pull.
v5 has the LM386
Did you buy directly from hfsignals.com on Aug 12 2019?
Or some other vendor?
Jerry, KE7ER
toggle quoted message
Show quoted text
On Mon, Dec 16, 2019 at 12:18 PM, V Zecchinelli wrote:
Jerry, Sarma, Gordon,
Wow, am I confused.? I purchased 12 August 2019 and I thought it was a V5 however after Jerry's response I looked and it is a V4.? My bad for not checking things better.? Live and learn.
I am using a stereo cable I bought on ebay cheap.? After your responses I decided to check the 3.5mm connectors to see if there could be a short there.? Well, there are only 2 wires in the cable and shield and ring are connected together.? Lesson, don't buy cheap cables on ebay.? I will order some quality stereo cables from Amazon and see how things go.
Thank you so much for your responses.
Vince
|
Jerry, Sarma, Gordon,
Wow, am I confused.? I purchased 12 August 2019 and I thought it was
a V5 however after Jerry's response I looked and it is a V4.? My bad
for not checking things better.? Live and learn.
I am using a stereo cable I bought on ebay cheap.? After
your responses I decided to check the 3.5mm connectors to see if
there could be a short there.? Well, there are only 2 wires in the
cable and shield and ring are connected together.? Lesson, don't buy
cheap cables on ebay.? I will order some quality stereo cables from
Amazon and see how things go.
Thank you so much for your responses.
Vince
On 12/16/2019 12:46 PM, Gordon Gibby
wrote:
toggle quoted message
Show quoted text
Are you DC shorting out the output with a transformer in the sound
card??
On Dec 16, 2019, at 12:07, Jerry Gaffke via Groups.Io < jgaffke@...>
wrote:
I'd guess your USB soundcard cabling is somehow (almost)
shorting out the audio from that 2822 chip.
Look for a short.
Perhaps add an 8 or 10 ohm resistor in series with the
TDA2822 to protect it from shorts like that.
The TDA2822 amp was used on v3.
Some discrete transistors were used on v4.
On v5, as Sarma has stated, the trusty (crusty?) old LM386
was used.
If you have a TDA2822 chip installed, it is probably v3.
A search of the forum for 2822 will reveal that a few v3
uBitx boards went out
with a WX branded TDA2822.? This clone of the TDA2822 works
fine up to about 8v,
above 8v it can sometimes self destruct.? ?If you have a WX
branded TDA2822 on
your board, I suggest you get an NJM2073D ordered from a
reputable distributor
It is pin compatible with the TDA2822, works fine, good to
15v or so.
The original TDA2822 in the DIP package from ST is no
longer available,
though ST does still sell it in an SOIC.
There are a half dozen different makers of clone TDA2822's,
many of them work fine.
Some of the clones work ok but only with a maximum supply
voltage of around 6v.
With the WX TDA2822 clone operating at 12v in the uBitx, the
chip might work fine
for weeks and then suddenly decide to blow bits of silicon
across the room.
A fun bit of trivia from?
? "The
LM386 was invented by Ernie Leroy Long at Motorola in
1969. It was originally for part of a fuel injection
system for a Ford Car."
If true, I assume it went by a different name at the time.
I'm a bit suspicious, a google for "LM386 Ernie" gets many
copies of exactly the above phrase with no further
information or attribution.
The "LM" prefix suggests National Semiconductor, perhaps it
had a different name coming out of Motorola.
Jerry, KE7ER
?
On Mon, Dec 16, 2019 at 07:10 AM, V Zecchinelli wrote:
Good Morning,
I have a quick question on FT8 with uBitx V5 using USB
soundcard (7.1 Channel).? Even with the volume of uBitx set
very low the 2822 audio amp gets very hot and if volume set
over 1/4 it will fail catastrophically.? On phone I can
listen to the radio all day with no issues.? Seems odd.?
Anyone else seen this problem?
Thanks,
Vince
|
Re: Brand new uBiTX v5.0 quality issue ?
Hi Skip, thank you so much for your precious advice!
Diego, I8TIF
|
Are you DC shorting out the output with a transformer in the sound card??
toggle quoted message
Show quoted text
On Dec 16, 2019, at 12:07, Jerry Gaffke via Groups.Io < jgaffke@...> wrote: I'd guess your USB soundcard cabling is somehow (almost) shorting out the audio from that 2822 chip.
Look for a short.
Perhaps add an 8 or 10 ohm resistor in series with the TDA2822 to protect it from shorts like that.
The TDA2822 amp was used on v3.
Some discrete transistors were used on v4.
On v5, as Sarma has stated, the trusty (crusty?) old LM386 was used.
If you have a TDA2822 chip installed, it is probably v3.
A search of the forum for 2822 will reveal that a few v3 uBitx boards went out
with a WX branded TDA2822.? This clone of the TDA2822 works fine up to about 8v,
above 8v it can sometimes self destruct.? ?If you have a WX branded TDA2822 on
your board, I suggest you get an NJM2073D ordered from a reputable distributor
It is pin compatible with the TDA2822, works fine, good to 15v or so.
The original TDA2822 in the DIP package from ST is no longer available,
though ST does still sell it in an SOIC.
There are a half dozen different makers of clone TDA2822's, many of them work fine.
Some of the clones work ok but only with a maximum supply voltage of around 6v.
With the WX TDA2822 clone operating at 12v in the uBitx, the chip might work fine
for weeks and then suddenly decide to blow bits of silicon across the room.
A fun bit of trivia from?
? "The LM386 was invented by Ernie Leroy Long at Motorola in 1969. It was originally for part of a fuel injection system for a Ford Car."
If true, I assume it went by a different name at the time.
I'm a bit suspicious, a google for "LM386 Ernie" gets many copies of exactly the above phrase with no further information or attribution.
The "LM" prefix suggests National Semiconductor, perhaps it had a different name coming out of Motorola.
Jerry, KE7ER
?
On Mon, Dec 16, 2019 at 07:10 AM, V Zecchinelli wrote:
Good Morning,
I have a quick question on FT8 with uBitx V5 using USB soundcard (7.1 Channel).? Even with the volume of uBitx set very low the 2822 audio amp gets very hot and if volume set over 1/4 it will fail catastrophically.? On phone I can listen to the radio all day with no issues.? Seems odd.? Anyone else seen this problem?
Thanks,
Vince
|
Re: STM32F769-FT8-Transceiver
Charles Begun the build process. I have downloaded all the info from github. Would you mind sharing some pics of back of your build. The video shows the front but I need a visual of the back side also 73 Art N2ajo From: [email protected] < [email protected]> On Behalf Of Charles Hill Sent: Monday, December 9, 2019 8:32 AM To: [email protected]Subject: [BITX20] STM32F769-FT8-Transceiver Well I finally gotten the <> STM32F769-FT8-Transceiver project to a state worth releasing. I have placed the files required for making the project on Github at this location: <> I hope you enjoy the project. Regards, Charley
|
Thanks Jerry. If the OP? used mono 3.5 male pin in to the 35 stereo sockt, i am sure the short citcuit created between sleeve and one channel.of audio ( on ring) will kill the audio amplifier.? Instead? he should use a stereo pin wand use one channel. Infact tip and ring of the socket are looped.? I expect the OP? to comeout of the scensrio unserwhich this failure is happenong on v5 board!!!!
Sarma vu3zmv
On Mon, 16 Dec 2019, 10:37 pm Jerry Gaffke via Groups.Io, <jgaffke= [email protected]> wrote: I'd guess your USB soundcard cabling is somehow (almost) shorting out the audio from that 2822 chip.
Look for a short.
Perhaps add an 8 or 10 ohm resistor in series with the TDA2822 to protect it from shorts like that.
The TDA2822 amp was used on v3.
Some discrete transistors were used on v4.
On v5, as Sarma has stated, the trusty (crusty?) old LM386 was used.
If you have a TDA2822 chip installed, it is probably v3.
A search of the forum for 2822 will reveal that a few v3 uBitx boards went out
with a WX branded TDA2822.? This clone of the TDA2822 works fine up to about 8v,
above 8v it can sometimes self destruct.? ?If you have a WX branded TDA2822 on
your board, I suggest you get an NJM2073D ordered from a reputable distributor
It is pin compatible with the TDA2822, works fine, good to 15v or so.
The original TDA2822 in the DIP package from ST is no longer available,
though ST does still sell it in an SOIC.
There are a half dozen different makers of clone TDA2822's, many of them work fine.
Some of the clones work ok but only with a maximum supply voltage of around 6v.
With the WX TDA2822 clone operating at 12v in the uBitx, the chip might work fine
for weeks and then suddenly decide to blow bits of silicon across the room.
A fun bit of trivia from?
? "The LM386 was invented by Ernie Leroy Long at Motorola in 1969. It was originally for part of a fuel injection system for a Ford Car."
If true, I assume it went by a different name at the time.
I'm a bit suspicious, a google for "LM386 Ernie" gets many copies of exactly the above phrase with no further information or attribution.
The "LM" prefix suggests National Semiconductor, perhaps it had a different name coming out of Motorola.
Jerry, KE7ER
?
On Mon, Dec 16, 2019 at 07:10 AM, V Zecchinelli wrote:
Good Morning,
I have a quick question on FT8 with uBitx V5 using USB soundcard (7.1 Channel).? Even with the volume of uBitx set very low the 2822 audio amp gets very hot and if volume set over 1/4 it will fail catastrophically.? On phone I can listen to the radio all day with no issues.? Seems odd.? Anyone else seen this problem?
Thanks,
Vince
|
Raj vu2zap