Many good suggestions.?
The quick way is to simply bolt on a small fender washer or even a ring terminal with the wire-end widened out flat.? In the end, remember that the 58xx are rated to operate just fine at temps warmer than most people want to touch, so, unless one is getting burned or the device is shutting down due to overload, I wouldn't worry too much.?
That said, A 1 x 2 cm strip of steel (think: PC expansion slot cover) is enough to take the edge off and feel more comfortable about it.
Ted K3RTA
|
Hi,
You can add a resistor if you want, but you need to know what current the display consumes because you don't want to drop too much voltage through the resistance.? Different 2-line LCD's will consume different current depending on their backlight type.? I imagine the Nexion displays also vary a lot in what they consume.? I would just put a TO-200 heatsink on the regulator and it should be fine with that.? Too much current through a resistor can cause other problems too (e.g. needs to be sized by wattage appropriately)!
73,
Mark.
|
I would agree with Raj.? Add a heat sink and use as is IF you are not planning any significant mods to the stock rig.
I did add a series resistor to my first uBitx v4 by lifting the input on the 7805 from the board and wired it in leaving the other two leads soldered to the Raduino.? The resistor lays flat against the board, one lead in the hole vacated by the 7805 input pin and the other connected to the input pin.
After doing the above, the regulator was much cooler.? However I would only go through the trouble on one of two conditions:
1 - If you are going to run with the input higher than 12.5 vdc to the main board (doesn't matter the voltage to the PA).
2 - If you are going to add a significant load to the 5 volt regulator in the form of another Nano or larger display.
Since I have already installed a 2.4" Nextion display and Dr. Lee's CEC software, and I want to add the standalone signal analyzer, I made the mod.
Above is my experience and opinion.? Yours may vary.?
73
Evan
AC9TU
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I was troubleshooting something I forget rather early, and discovered that hot regulator and thought I may have fried something it fed. Fortunately someone here had months of ubitx experience.?
These regulators are designed for warmth. I imagine someone has researched how close we are to its thermal recommended margin. Yet who has ever had one fail. The dissipation has to go someplace, and many watt resistors aren't cheap. Best to keep it like this.
Curt
|
Find the 12V connection to the regulator and add another regulator between the 12V supply and the 7805 regulator. A 7809 or 7808 mounted on the metal case would be fine. Add a 1¦Ìf, 100nf and 10nf capacitors in parallel at the output of the 7809 or 7808 regulator and similar capacitors at its input. This splits the drop between the regulators.
A resistor is cheaper but regulators cost only a few cents. You can also mount the 7805 on the metal case. Regards
A small heat sink like the finals or a small metal plate to increase the heat dissipation
can be repurposed from some junk..
I just let them cook and curse when I burn my fingers on the Raduino!
Raj
At 17-03-19, you wrote:
>Just starting to wire up my v5 uBitX and trying to solve problems ahead of time.? I would very much like to install a series resistor to lighten the work of the Raduino 5V regulator, but can't for the life of me see where it can be easily done (that is, without cutting traces, etc).? I have looked through most of the documentation and forum entries but haven't found any details.? Could someone point me in the right direction as to how this can be physically done?? If it can't be easily accomplished, given my 70+ year old fingers and eyes, I will have to settle for just a heat sink.? (Which might not be a bad idea anyway, HI)? Many thanks.
>... Martin? ?VE3OAT
|
A small heat sink like the finals or a small metal plate to increase the heat dissipation
can be repurposed from some junk..
I just let them cook and curse when I burn my fingers on the Raduino!
Raj
toggle quoted message
Show quoted text
At 17-03-19, you wrote: Just starting to wire up my v5 uBitX and trying to solve problems ahead of time. I would very much like to install a series resistor to lighten the work of the Raduino 5V regulator, but can't for the life of me see where it can be easily done (that is, without cutting traces, etc). I have looked through most of the documentation and forum entries but haven't found any details. Could someone point me in the right direction as to how this can be physically done? If it can't be easily accomplished, given my 70+ year old fingers and eyes, I will have to settle for just a heat sink. (Which might not be a bad idea anyway, HI) Many thanks.
... Martin VE3OAT
|
I should also have mentioned that??Pocket RxTx works perfectly with the uBitx when connected to the Raduino Nano USB port with no modifications needed to the uBitx.
73 Bob GM4CID
|
Ray,
Another possibility is to use the app Pocket RxTx available from the Google Play Store at
.
Pocket RxTx?doesn't need a lot of horsepower so?will work with an older (or current) Android phone or tablet that can use?an OTG cable.
Connection is USB so a normal Yaesu CAT cable is needed or can be by bluetooth with a special adapter plugged into the back of the rig.
73, Bob GM4CID
|
Hi Bob:
Can I make the payment through Paypal?
can use QRZ address to contact directly with me
LuisM
EB4EPY
|
I think mine for the 817 is this one.
Valley Enterprises? Yaesu USB FTDI CT-62 CAT Cable FT-100, FT-817, FT-857, FT-897
Ray
We have all these display options for bitx rigs because of generous folk who do the programming,? and the open source of the design. With ft817 you must do surgery in hardware and software, it just isn't made for that. I see Laurence has a wonderful idea, use a PC interface.
BTW there is a nice, cheap enough, third party interface to USB out there. Reminds me I should get one, if they are still sold.
73 curt
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Re: Saving V5 Default Calibration file and sharing
Hi Ted Was looking for Cec with nextion Turns out i just found a saved file that I had after all saved when i first got the V5. I usually upgrade to CEC then save the factory defaults. Regards and thanks Laurence
Original firmware, or aftermarket such as CEC??
If the latter, a re-install of that will do it.? If not, it's worth the upgrade.
-Ted
K3RTA
On Saturday, March 16, 2019, 8:16:46 PM EDT, Laurence Oberman < oberman.l@...> wrote:
Hello
If anybody has Ian Lee's manager software working on the V5, can you
share you capture of your calibration file please.
I was tweaking mine to sound audio wise like my V4 but its not right
and I have changed both BFO and frequency already.
I want to start again with a generic and I forgot to save mine before
I started messing with it.
Thanks
Laurence
|
toggle quoted message
Show quoted text
-----Original Message----- From: Martin Potter <ve3oat@...>
Sent: Mar 16, 2019 7:56 PM
To: [email protected]
Subject: [BITX20] Series rresistor for Raduino 5V regulator #raduino #ubitx
Just starting to wire up my v5 uBitX and trying to solve problems ahead of time. I would very much like to install a series resistor to lighten the work of the Raduino 5V regulator, but can't for the life of me see where it can be easily done (that is, without cutting traces, etc). I have looked through most of the documentation and forum entries but haven't found any details. Could someone point me in the right direction as to how this can be physically done? If it can't be easily accomplished, given my 70+ year old fingers and eyes, I will have to settle for just a heat sink. (Which might not be a bad idea anyway, HI) Many thanks.
... Martin VE3OAT
Hi Martin, From my experience, you can just mount the regulator on the case (chassis), see attachment. If you are going to use a Nextion in place of your LCD display, mine required a 3.3 ohm 2 watt resistor in series with the input, with a 270 ufd cap to ground. Without it, I got a loud growling. These are so much fun!! Kind Regards.. Richard Spohn WA6PXC
|
On Sat, Mar 16, 2019 at 07:56 PM, Martin Potter wrote:
Just starting to wire up my v5 uBitX and trying to solve problems ahead of time. I would very much like to install a series resistor to lighten the work of the Raduino 5V regulator, but can't for the life of me see where it can be easily done (that is, without cutting traces, etc). I have looked through most of the documentation and forum entries but haven't found any details. Could someone point me in the right direction as to how this can be physically done? If it can't be easily accomplished, given my 70+ year old fingers and eyes, I will have to settle for just a heat sink. (Which might not be a bad idea anyway, HI) Many thanks.
... Martin VE3OAT
?Hi Martin, I am really about the same relative spot as you are in building. My suggestion? would be to heat sink the unit, get the ubitx working stock, then make changes after all is functional.? 73,? Kelly K5AID?
|
Re: What have I done to the receive? Weird screech?
#ubitx
YES!? That fixed it!? Wonderful!? Thanks for that info!
|
Just starting to wire up my v5 uBitX and trying to solve problems ahead of time. I would very much like to install a series resistor to lighten the work of the Raduino 5V regulator, but can't for the life of me see where it can be easily done (that is, without cutting traces, etc). I have looked through most of the documentation and forum entries but haven't found any details. Could someone point me in the right direction as to how this can be physically done? If it can't be easily accomplished, given my 70+ year old fingers and eyes, I will have to settle for just a heat sink. (Which might not be a bad idea anyway, HI) Many thanks.
... Martin VE3OAT
|
Ray
We have all these display options for bitx rigs because of generous folk who do the programming,? and the open source of the design. With ft817 you must do surgery in hardware and software, it just isn't made for that. I see Laurence has a wonderful idea, use a PC interface.
BTW there is a nice, cheap enough, third party interface to USB out there. Reminds me I should get one, if they are still sold.
73 curt
|
Re: Saving V5 Default Calibration file and sharing
Original firmware, or aftermarket such as CEC??
If the latter, a re-install of that will do it.? If not, it's worth the upgrade.
-Ted
K3RTA
On Saturday, March 16, 2019, 8:16:46 PM EDT, Laurence Oberman <oberman.l@...> wrote:
Hello
If anybody has Ian Lee's manager software working on the V5, can you
share you capture of your calibration file please.
I was tweaking mine to sound audio wise like my V4 but its not right
and I have changed both BFO and frequency already.
I want to start again with a generic and I forgot to save mine before
I started messing with it.
Thanks
Laurence
|
Saving V5 Default Calibration file and sharing
Hello
If anybody has Ian Lee's manager software working on the V5, can you
share you capture of your calibration file please.
I was tweaking mine to sound audio wise like my V4 but its not right
and I have changed both BFO and frequency already.
I want to start again with a generic and I forgot to save mine before
I started messing with it.
Thanks
Laurence
|
I use flrig for the 817 , works great and its "free", simple but good.
Set it up for the 817 using 4800 baud and the cat control cable to USB
Here is a screenshot
sudo apt-get install flrig on Ubuntu
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Show quoted text
On Sat, Mar 16, 2019 at 7:12 PM Anthony Luscre <k8zt73@...> wrote:
Sorry, I guess original version is no longer available.
On Sat, Mar 16, 2019 at 7:11 PM Anthony Luscre via Groups.Io <k8zt73@...> wrote:
You could use the original free version of HamRadioDeluxe to give you a large display on a computer-
On Sat, Mar 16, 2019 at 7:06 PM rf200655 <crf2@...> wrote:
Any know program to add 3.5 display to a ft817nd.There is one on eBay but out of my price range.Bad eye sight.
Thanks & 73
Ray
KC4DYM
--
Anthony Luscre
K8ZT
Ohio Section Section Youth Coordinator & Education Outreach
ARRL - The National Association For Amateur Radio?
a@... (best for Education & Technology)
k8zt@... (best for Amateur Radio)
The Web Resource Hoarder- www.ZTLearn.com
Web Resource Hoarder Blog
K8ZT Radio Website- www.k8zt.com
My Radio Blog- k8zt.blogspot.com
--
Anthony Luscre
K8ZT
Ohio Section Section Youth Coordinator & Education Outreach
ARRL - The National Association For Amateur Radio?
a@... (best for Education & Technology)
k8zt@... (best for Amateur Radio)
The Web Resource Hoarder- www.ZTLearn.com
Web Resource Hoarder Blog
K8ZT Radio Website- www.k8zt.com
My Radio Blog- k8zt.blogspot.com
|
Congrats Laurence!
Raj
toggle quoted message
Show quoted text
At 16/03/2019, you wrote: Hello
Finally fixed !!!!!
Beware of faulty MIC sockets, may measure true on continuity but I had issues.
Took the MIC socket out tested voltages bare and all was well.
Replaced the MIC socket and I am back to having audio.
I had already re-soldered the wires to no avail, and this was
originally working so I have not idea,
Maybe oxidation.
Anyway in case others have issues, see thus post and
/g/BITX20/topic/no_mic_audio/19202825?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,19202825
73
KB1HKO
Laurence Oberman
On Sat, Mar 16, 2019 at 9:54 AM Laurence Oberman via Groups.Io
<oberman.l@...> wrote:
Hello
Still chasing my MIC issue which matches this post
/g/BITX20/topic/no_mic_audio/19202825?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,19202825
There is mention made of seeing about 12v on the mic transistor
circuit at R66 and C64, with an unplugged mic.
This 12v can only be seen however with ptt enabled from what I can see
in the schematic.
Just making sure I understand the circuit properly here
Thanks
Laurence
On Wed, Mar 13, 2019 at 11:50 PM Raj vu2zap <rajendrakumargg@...> wrote:
Wiring looks correct however if the mic jack if not inserted properly
or any other improper wiring on the mic/ptt there may be a short
of ptt line and mic line..
To check, remove the PTT line from the socket and wire a switch
separately and see if the mic voltage comes up or audio increase.
Raj
At 14/03/2019, you wrote:
Hello Raj
Here is a picture of my connections all run true to the board and the Raduino.
The Key and the headphone are working fine, the radio is clean and
doing well on CW, both V4 and V5
The purple goes to the Raduino MIC pin Orange to the PTT but I have
low audio and the wrong Voltage.
Can anybody see an issue here.
When I key the MIC I see the carrier but its almost like the Audio is
not getting modulated on the carrier.
I have not done any BFO adjustment yet.
Thanks
Laurence
On Wed, Mar 13, 2019 at 10:12 AM Laurence Oberman <oberman.l@...> wrote:
Hello Raj
So both V4 and V5 show about 5v only on the Violet wire for the MIC
pin when I press PTT and go into TX.
I am measuring between the MIC pin and ground when I see about 5v.
Are you seeing 10v when you press PTT and measure. Is that 10v
Peak-to-Peak between the PTT pin and the MIC pin
i.e. -5v to +5v
I will re-calibrate the BFO as well
On Wed, Mar 13, 2019 at 8:18 AM Laurence Oberman <oberman.l@...> wrote:
Hello Raj
I am checking, I know the electret was correctly polarized on the V4.
I will test with it disconnected and just enabling PTT. I need to put
the V5 back in and check.
The reason I started looking into this was my audio gain was very low
with the mic.
In fact almost no signal seen when talking into the Mike, only visible
with a loud whistle on the scope.
Thanks
Laurence
On Wed, Mar 13, 2019 at 2:48 AM Raj vu2zap <rajendrakumargg@...> wrote:
Laurence,
You should see about 10V approx.
I think your electret mic polarity is wrong. The solder pad connected to the can of the mic is -ve or grounded.
Raj
At 12/03/2019, you wrote:
Hello
What is the expected mic pin voltage when you press PTT on a v4 and V5 board.
I am seeing 4.8v on V5 seems low to me. The V4 was about 5.2v.
Thanks
Laurence
|
Ted
Raj vu2zap
Hoshnasi
