The problem is it is dropping at least 7v at whatever current the Arduino draws. It really does need heatsinking.
?
Ian
?
Sent from for Windows 10
?
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On my bitx40 the 5v regulator and the raduino board gets very hot. Checked the wiring twice but find nothing wrong, can someone please tell me what the problem is. Also when it's turned on the display says calibrate and the tuning goes from
neg 250000 to pos 261500.
|
I do not have the Bitx40, however the current version of the BITX40 uses the same Raduino as on the uBitx v4.
The Raduino 7805 regulator also gets hot because it is dropping the 12v in down to 5 volts.? The 7805 used in the Raduino can do this, however the power dissipation is close to the limit for the device without a heat sink.?
I did two things to solve it for the uBitx that I have:
1 Added a heat sink
2 Added a voltage dropping resistor.?
It is really easy to add the heat sink, and should be done in my opinion.
If you go to step 2, the wattage and resistance depends on what is connected to the 5v source; for the uBitx with Nextion display and other components I added a 4 ohm 5 watt resistor in series with the input to the 7805.? This gives me up to 1 amp of 5v for multiple displays and nanos for increased functionality.? For the standard Raduino with nano, and assuming 12v input to the rig, the value can go from 4 to 47 ohms.? The ubitx draws less than 120 ma on the 5 volt regulator with the standard display.? If you have no plans to add on other 5v devices, I would use a 47 ohm resistor rated at 2 watts.
Again, I do not have a BITX40, so a number of assumptions were made on the above from the information on line. It also means I do not know the calibration process for the BITX40, someone else will need to help you there.
Happy New Year and 73
Evan
AC9TU
|
What's makes the 5v reg so hot you get burned while touching it, the nano board gets very hot also. This doesn't seem right for a bitx40 that's 10 days old.
On Mon, Dec 31, 2018, 12:24 Michael Hagen < motdog@... wrote:
That is standard.??
You can leave it if you are careful not to break it off
hanging in the wind.
The regulator can usually work fine
running hot.
Put a 1N4002 Diode and
47 ohm 1W in series to the regulator and add a bypass
electrolytic to ground.
This puts some of the
power into them.
You can mount the
regulator on the other side of the PCB so it does not hang
out.? My improved version of Raduino (RaduinoX) uses a heat
sink with bolt, diode, and resistor with more capacitors.? I
change a lot of other things too.? The Nano in a socket in
nice too!
Mike, WA6ISP
On 12/31/2018 9:06 AM, ae1ct1998 wrote:
On my bitx40 the 5v regulator and the raduino
board gets very hot. Checked the wiring twice but find nothing
wrong, can someone please tell me what the problem is. Also when
it's turned on the display says calibrate and the tuning goes
from neg 250000 to pos 261500.
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
That is standard.??
You can leave it if you are careful not to break it off
hanging in the wind.
The regulator can usually work fine
running hot.
Put a 1N4002 Diode and
47 ohm 1W in series to the regulator and add a bypass
electrolytic to ground.
This puts some of the
power into them.
You can mount the
regulator on the other side of the PCB so it does not hang
out.? My improved version of Raduino (RaduinoX) uses a heat
sink with bolt, diode, and resistor with more capacitors.? I
change a lot of other things too.? The Nano in a socket in
nice too!
Mike, WA6ISP
On 12/31/2018 9:06 AM, ae1ct1998 wrote:
On my bitx40 the 5v regulator and the raduino
board gets very hot. Checked the wiring twice but find nothing
wrong, can someone please tell me what the problem is. Also when
it's turned on the display says calibrate and the tuning goes
from neg 250000 to pos 261500.
--
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID "MotDog@..."
Mike@...
|
On my bitx40 the 5v regulator and the raduino board gets very hot. Checked the wiring twice but find nothing wrong, can someone please tell me what the problem is. Also when it's turned on the display says calibrate and the tuning goes from neg 250000 to pos 261500.
|
Please let me know what is the out put power?
On Mon, 31 Dec 2018, 8:44 pm LKNDAVE via Groups.Io <novatronix= [email protected] wrote: this article drew my interest big time: prreselector preamp. i am gathering parts now. tayda here i come.
73, dave
|
|
|
Re: Ideas for homebrew rig for digital modes on VHF/UHF
Transverters have one tacit advantage : it can be put very close to the antenna and having gain you don't need extremely low loss cable. Eastern European transverters are appealing for the price but I would welcome something like an 'Indian' dual band transverter that matches perfectly ubitx units.
Il 31/dic/2018 14:28, "Curt via Groups.Io" <wb8yyy= [email protected]> ha scritto: Allison
Of course I mean suitable devices for uhf, and good design practices. I was hoping maybe you would take it on. Something like ft817 except more capable as a vhf uhf only rig, as we each have a ubitx for HF.
I imagine a half duplex could use a ubitx board without the PA as a backend.? okay perhaps a receive only unit would be cheaper for the downlink.
I confess I am not up to date yet on what is up. Lets see I have a 2m tentec transverter and a small brick, an ft817 and small yagis. Yes I agree its a lot more cost than a ubitx. Still seeing those low cost transverters from that guy in central Europe, its possible.
73 curt
|
this article drew my interest big time: prreselector preamp. i am gathering parts now. tayda here i come.
73, dave
|
when i visit our local recycling centre i always ask if they have any old electrc lawnmowers and cut the cable and use this as aerial wire.dave G0AYD. HAPPY NEW YEAR EVERYONE.
On Mon, 31 Dec 2018 at 14:32, Jack Purdum via Groups.Io <jjpurdum= [email protected]> wrote:
All:
Don't forget second hand (often church-related) stores. I picked up 3 feet of 50 conductor ribbon cable for $0.10, and a 19V, 3.5A laptop wall wart for $1.75 which I think I'll use for the ?BITX PA supply as it's very clean. You can also buy complete old computers for under $10 and the PS alone with worth much more than that!
Jack, W8TEE
On Monday, December 31, 2018, 2:58:03 AM EST, Bob Lunsford via Groups.Io <nocrud222= [email protected]> wrote:
REF:
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.
This makes it much easier to find cables for them.? It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
~~~~~~~~~~~~~~~~~~~~~~
When shopping for cables and chargers, check Dollar Tree first. There are some items
such a stereo-to-stereo cables there.
I cut off one end of such a cable and used the cable for the mic...it worked fine.
You only have to Ohm out the connector and wires to make a color translation table
for the correct connection to the mic per the schematic/diagram.The one I used had a
braided outer covering that looked like some of the cables used for earphones
ages ago but it was silver colored. Neat.
Bob ¡ª KK5R
--------------------------------------------
Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano
Date: Sunday, December 30, 2018, 7:19 PM
Arduino Nano's
are starting to show up with micro-USB instead of mini-USB
connectors.?
This makes it much
easier to find cables for them.? It also means that they
can be powered
with the
less-than-a-dollar plug-in chargers from the Dollar
Store.
These particular Nano's are
interesting because it appears that they include real
crystals for
the 12 MHz USB and
16 MHz AVR processor.?
Arv? K7HKL_._
On Sun, Dec 30, 2018 at 3:09 PM Woody < mailme@...> wrote:
Reading down the add, it
appears that it is shipped without a clock
crystal as well.
Woody, KZ4AK
On 12/30/2018 21:50, ag4qc38313 wrote:
> Well, yes. But then the shipping is $2.50? Not such a
good deal anymore.
>
|
Re: Need help getting replacement Detention Free Tuning Encoder with Push Button
Morning Jack, Yes, ?ordering 10 is a good idea. I was pleasantly surprised the cost wasn¡¯t bad. Need to get some switches and other stuff. ?Plan to order some replacement transistors to see if it will help the low power output on the higher bands. ?Also relays. ? ? Funny how there are always additional modifications. ?? Dan. W3BU
toggle quoted message
Show quoted text
On Dec 31, 2018, at 9:27 AM, Jack Purdum via Groups.Io < jjpurdum@...> wrote:
Mornin' Dan:
You're welcome. I'd order 10 of them, as you will find hundreds of uses for them over time, especially if you start messing around with programming. I just ordered a bunch for my Builder Club plus my own use. (I now have over 50 encoders of which about 20 are for my own use! Can't have too many!)
Jack, W8TEE
On Sunday, December 30, 2018, 11:58:35 PM EST, Dan Schaefer < CLANCY.987@...> wrote:
Jack, Thank you for the speedy reply on my Tuning Encoder info request. ?I will order some first thing tomorrow along with some other parts that I really don¡¯t need but are nice to have on hand.? Really appreciate the assist and the quick response.? Dan. W3BU
On Dec 30, 2018, at 10:44 PM, Jack Purdum via Groups.Io < jjpurdum@...> wrote:
:
????652-PEC11R-4020F-S24
??? (Mouser #)
??? PEC11R-4020F-S0024??????? (Bourn #)
Jack, W8TEE
On Sunday, December 30, 2018, 10:04:47 PM EST, Dan Schaefer < CLANCY.987@...> wrote:
I am just about finished putting together my ubitx radio.? As I was doing the final assembly I noticed the tuning encoder on the floor looking significantly worse than original condition. I looked it over and cleaned up the connector misalignments but am not sure it is still working.
Would like to get some replacements but don¡¯t know the part number or where to order it from.? Help Please ?
I completed the assembly using the encoder I have ans fired up the unit.? Display comes up with the 7150 frequency but can¡¯t tune the radio or go to different setups by pushing the encoder.? The receiver seems to be working on the one frequency but can¡¯t do anything else with it. Haven¡¯t had any time to investigate yet but am open for suggestions.? Tx keys but no power out as yet.
Would like to quickly get a new encoder just in case it is my only problem. But wouldn¡¯t be surprised if I missed other things.? Am wondering if I might be missing a ground on the encoder ?
It¡¯s been fun doing the radio (v4) but am now anxious to get it working.
Thanks All
Dan. W3BU
|
All:
Don't forget second hand (often church-related) stores. I picked up 3 feet of 50 conductor ribbon cable for $0.10, and a 19V, 3.5A laptop wall wart for $1.75 which I think I'll use for the ?BITX PA supply as it's very clean. You can also buy complete old computers for under $10 and the PS alone with worth much more than that!
Jack, W8TEE
On Monday, December 31, 2018, 2:58:03 AM EST, Bob Lunsford via Groups.Io <nocrud222@...> wrote:
REF:
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.
This makes it much easier to find cables for them.? It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
~~~~~~~~~~~~~~~~~~~~~~
When shopping for cables and chargers, check Dollar Tree first. There are some items
such a stereo-to-stereo cables there.
I cut off one end of such a cable and used the cable for the mic...it worked fine.
You only have to Ohm out the connector and wires to make a color translation table
for the correct connection to the mic per the schematic/diagram.The one I used had a
braided outer covering that looked like some of the cables used for earphones
ages ago but it was silver colored. Neat.
Bob ¡ª KK5R
--------------------------------------------
Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano
Date: Sunday, December 30, 2018, 7:19 PM
Arduino Nano's
are starting to show up with micro-USB instead of mini-USB
connectors.?
This makes it much
easier to find cables for them.? It also means that they
can be powered
with the
less-than-a-dollar plug-in chargers from the Dollar
Store.
These particular Nano's are
interesting because it appears that they include real
crystals for
the 12 MHz USB and
16 MHz AVR processor.?
Arv? K7HKL_._
On Sun, Dec 30, 2018 at 3:09 PM Woody < mailme@...> wrote:
Reading down the add, it
appears that it is shipped without a clock
crystal as well.
Woody, KZ4AK
On 12/30/2018 21:50, ag4qc38313 wrote:
> Well, yes. But then the shipping is $2.50? Not such a
good deal anymore.
>
|
Re: Need help getting replacement Detention Free Tuning Encoder with Push Button
Mornin' Dan:
You're welcome. I'd order 10 of them, as you will find hundreds of uses for them over time, especially if you start messing around with programming. I just ordered a bunch for my Builder Club plus my own use. (I now have over 50 encoders of which about 20 are for my own use! Can't have too many!)
Jack, W8TEE
On Sunday, December 30, 2018, 11:58:35 PM EST, Dan Schaefer <CLANCY.987@...> wrote:
Jack, Thank you for the speedy reply on my Tuning Encoder info request. ?I will order some first thing tomorrow along with some other parts that I really don¡¯t need but are nice to have on hand.? Really appreciate the assist and the quick response.? Dan. W3BU
On Dec 30, 2018, at 10:44 PM, Jack Purdum via Groups.Io < jjpurdum@...> wrote:
:
????652-PEC11R-4020F-S24
??? (Mouser #)
??? PEC11R-4020F-S0024??????? (Bourn #)
Jack, W8TEE
On Sunday, December 30, 2018, 10:04:47 PM EST, Dan Schaefer < CLANCY.987@...> wrote:
I am just about finished putting together my ubitx radio.? As I was doing the final assembly I noticed the tuning encoder on the floor looking significantly worse than original condition. I looked it over and cleaned up the connector misalignments but am not sure it is still working.
Would like to get some replacements but don¡¯t know the part number or where to order it from.? Help Please ?
I completed the assembly using the encoder I have ans fired up the unit.? Display comes up with the 7150 frequency but can¡¯t tune the radio or go to different setups by pushing the encoder.? The receiver seems to be working on the one frequency but can¡¯t do anything else with it. Haven¡¯t had any time to investigate yet but am open for suggestions.? Tx keys but no power out as yet.
Would like to quickly get a new encoder just in case it is my only problem. But wouldn¡¯t be surprised if I missed other things.? Am wondering if I might be missing a ground on the encoder ?
It¡¯s been fun doing the radio (v4) but am now anxious to get it working.
Thanks All
Dan. W3BU
|
Hi Al,
This looks like a clever way to avoid two jacks - well done.? One thing I don't follow on photo - your schematic has a mono plug at left (presumably to plug into the straight key jack), but the photo shows a stereo plug on left.? Can you please clarify?? I am just putting my uBitx in enclosure and would love to do this mod.
Thanks,
Scott VO1DR
St. John's, Newfoundland
|
Advantages and disadvantages of various modes
I bow to superior knowledge!? Thanks for the clarifications. This will become an article in my monthly newsletter.
--
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter
|
Re: Ideas for homebrew rig for digital modes on VHF/UHF
Allison
Of course I mean suitable devices for uhf, and good design practices. I was hoping maybe you would take it on. Something like ft817 except more capable as a vhf uhf only rig, as we each have a ubitx for HF.
I imagine a half duplex could use a ubitx board without the PA as a backend.? okay perhaps a receive only unit would be cheaper for the downlink.
I confess I am not up to date yet on what is up. Lets see I have a 2m tentec transverter and a small brick, an ft817 and small yagis. Yes I agree its a lot more cost than a ubitx. Still seeing those low cost transverters from that guy in central Europe, its possible.
73 curt
|
we get cheaper as well , if we don't need the usb cable.-
On Mon, Dec 31, 2018 at 1:28 PM Bob Lunsford via Groups.Io <nocrud222= [email protected]> wrote: REF:
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.
This makes it much easier to find cables for them.? It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
~~~~~~~~~~~~~~~~~~~~~~
When shopping for cables and chargers, check Dollar Tree first. There are some items
such a stereo-to-stereo cables there.
I cut off one end of such a cable and used the cable for the mic...it worked fine.
You only have to Ohm out the connector and wires to make a color translation table
for the correct connection to the mic per the schematic/diagram.The one I used had a
braided outer covering that looked like some of the cables used for earphones
ages ago but it was silver colored. Neat.
Bob ¡ª KK5R
--------------------------------------------
On Sun, 12/30/18, Arv Evans <arvid.evans@...> wrote:
?Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano
?To: [email protected]
?Date: Sunday, December 30, 2018, 7:19 PM
?Arduino Nano's
?are starting to show up with micro-USB instead of mini-USB
?connectors.?
?This makes it much
?easier to find cables for them.? It also means that they
?can be powered
?with the
?less-than-a-dollar plug-in chargers from the Dollar
?Store.
?
?These particular Nano's are
?interesting because it appears that they include real
?crystals for
?the 12 MHz USB and
?16 MHz AVR processor.?
?
?
?Arv? K7HKL_._
?On Sun, Dec 30, 2018 at 3:09 PM Woody <mailme@...>
?wrote:
?Reading down the add, it
?appears that it is shipped without a clock
?crystal as well.
?Woody, KZ4AK
?On 12/30/2018 21:50, ag4qc38313 wrote:
?> Well, yes. But then the shipping is $2.50? Not such a
?good deal anymore.
?>
|
REF:
Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.
This makes it much easier to find cables for them. It also means that they can be powered
with the less-than-a-dollar plug-in chargers from the Dollar Store.
~~~~~~~~~~~~~~~~~~~~~~
When shopping for cables and chargers, check Dollar Tree first. There are some items
such a stereo-to-stereo cables there.
I cut off one end of such a cable and used the cable for the mic...it worked fine.
You only have to Ohm out the connector and wires to make a color translation table
for the correct connection to the mic per the schematic/diagram.The one I used had a
braided outer covering that looked like some of the cables used for earphones
ages ago but it was silver colored. Neat.
Bob ¡ª KK5R
--------------------------------------------
toggle quoted message
Show quoted text
On Sun, 12/30/18, Arv Evans <arvid.evans@...> wrote: Subject: Re: [BITX20] nanos on sale at banggood for $2.39 USD #arduino #nano To: [email protected] Date: Sunday, December 30, 2018, 7:19 PM Arduino Nano's are starting to show up with micro-USB instead of mini-USB connectors.? This makes it much easier to find cables for them.? It also means that they can be powered with the less-than-a-dollar plug-in chargers from the Dollar Store. These particular Nano's are interesting because it appears that they include real crystals for the 12 MHz USB and 16 MHz AVR processor.? Arv? K7HKL_._ On Sun, Dec 30, 2018 at 3:09 PM Woody <mailme@...> wrote: Reading down the add, it appears that it is shipped without a clock crystal as well. Woody, KZ4AK On 12/30/2018 21:50, ag4qc38313 wrote: > Well, yes. But then the shipping is $2.50? Not such a good deal anymore. >
|
Re: Tracing receive signal for low signal
Outboard af amp probably easiest to implement
Jim
On Sunday, December 30, 2018, 9:24:45 PM PST, Dave Space <davesspacebar@...> wrote:
Still needs work 100uv in is moderately loud but not great yet.? ?So might need some more amplification. Maybe one more transistor might do the trick.
|
REF:
In that case Harvey, you could accomplish the same thing with adding more AF gain. It is not a big deal...... but adding RF gain when you already have detectable antenna noise reduces the dynamic range of the receiver making it more susceptible to overload.
It is somewhat of an "angels on the head of a pin" discussion. Just ignore me..... :-).
WA8TOD
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
I used amplified computer speakers to bring up the received
signals. I put the speakers on full audio and did all volume
adjustment on the radio. What amazed me is that with the
antenna switched to the dummy load on an unused station,
the output from the speakers at full volume on both the radio
and the speakers, there was practically no sound at all which
means the radio is essentially quiet. But when I put the radio
on a known, strong AM broadcast station, there is enough
leakage in the antenna transfer switch to hear the broadcast
station although not very strongly.
i therefore suggest plugging in a set of amplified computer
speakers as an experiment to see if this is enough to increase
the gain of the system to where it is all you need. Also, a good
antenna is essential. I use an 80M G5RV and an MFJ 40M and
up OCFD for most listening and this gives me 80-10M with good
AM broadcast (on the G5RV).
Bob ¡ª KK5R
--------------------------------------------
toggle quoted message
Show quoted text
On Sun, 12/30/18, Warren Allgyer <allgyer@...> wrote: Subject: Re: [BITX20] RF Amplifier Added #ubitx To: [email protected] Date: Sunday, December 30, 2018, 12:04 PM In that case Harvey, you could accomplish the same thing with adding more AF gain. It is not a big deal...... but adding RF gain when you already have detectable antenna noise reduces the dynamic range of the receiver making it more susceptible to overload.? It is somewhat of an "angels on the head of a pin" discussion. Just ignore me..... :-). WA8TOD
|
YO8UFO
Bob Lunsford