Re: #sbitx A cool (kludgy) way to remotely use the sbitx
#sBitx
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On Mon, Sep 5, 2022, 7:25 PM Evan Hand < elhandjr@...> wrote: Farhan,
The Raspberry Pi OS has VNC built in.? That will open an X-window environment on any operating system.? Here is a link on how to set up to use VNC on a Raspberry Pi:
73
Evan
AC9TU
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Re: #sbitx A cool (kludgy) way to remotely use the sbitx
#sBitx
Farhan,
The Raspberry Pi OS has VNC built in.? That will open an X-window environment on any operating system.? Here is a link on how to set up to use VNC on a Raspberry Pi:
73
Evan
AC9TU
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Thanks for all the comments. 1.? It is difficult to fit ANYTIHNG inside an Icom 7300, so we build them externally for those and for $5000 police/fire transceivers.? ?Yes, it is better to install INSIDE...but sometimes you simply cannot. 2.? We previously used exactly what one commenter suggested -- the parallel reverse diode and series fuse.? ?Then one of my volunteers showed me a destroyed system where the diode didn't manage to blow the fuse in time for some fancy current measruing?gizmo.? ?Oops!? ?THat was the experience that got me working. 3.? Almost all of the P channel enhancement MOSFETS out there are very similar except for their series Rds-on? ? Most of them are quoted at a gate voltage of -10 (with reference to the source) and thus they are fairly interchangeable.? ?SOME (very few) have a protective zener built in to protect the vulnerable GATE but not very many, hence the zener built into the circuit in our simple (plagiarized) design. 4.? Yes, Max is right, these through-hole devices keep showing up--and then being made obsolete and disappearing.? ?However, the SMD versions are readily available.? ?I bought some -- yikes they are smaller than I like dealing with -- but then I found A NEW SUPPLIER of the automotive-market p-channel enhancements that had just what I was looking for and CHEAP.? ? I sent y'all the note quickly and haven't the time to find you that part instantly, but it (or the NEXT replacement) exists.? ?The worldwide governmental intrusion into markets has upset all manner of manufacturing and thus we have shortages of all kinds, but there is generally always something out there.? ?? 5.? I can't remember, but I think I made the PCB availble as a Project on ? ? ?It isn't a great design.? ?It did however, allow a couple dozen to be made in our town and successfully.? ?Add solder or wires to the traces if you need a lot more current capability.? ?The MOSFETS used to be easily available so we put as many as 4 on there to handle 25 Amps.? ??
Perhaps I can find my notes and the latest enhancement mostfet out there that is available.? ?They all seem to have the same PINOUT as well, but of course, please check that.? ?In our design they lose less voltage THAN THE CONNECTORS!!!? ?And thus there is no need for heat sinks at all.? ?Amazing.? ?For a guy who started in vacujm tubes 12AX7 and 6146 and 811A....then had to learn bipolar transistors and their wierd?nonlinearities, to have some astonishingly low Rds-on in a MOSFET as a near perfect "switch" (at dc) is just amazing.? ??
Happy homebrewing! 73 Gordon KX4Z
Good luck finding the mosfet! The part has been superseded (change the last digit in the p/n from a 1 to a 2) but I couldn't find them anywhere. Mouser shows a lead time of 52 weeks which basically means they don't know when they will have them.
Max
On Sunday, September 4, 2022, 10:59:06 PM CDT, otalado < s53c.lado@...> wrote:
Hi, Gordon
while it is true that just showing a diode into the power supply line is cheap & quick, the solution you suggested is, without doubt, a lot better. In fact, I'll order (or produce) some PCB for the protector. Yet I strongly believe that such protection should always be built inside the box that needs protection!
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Good luck finding the mosfet! The part has been superseded (change the last digit in the p/n from a 1 to a 2) but I couldn't find them anywhere. Mouser shows a lead time of 52 weeks which basically means they don't know when they will have them.
Max
On Sunday, September 4, 2022, 10:59:06 PM CDT, otalado <s53c.lado@...> wrote:
Hi, Gordon
while it is true that just showing a diode into the power supply line is cheap & quick, the solution you suggested is, without doubt, a lot better. In fact, I'll order (or produce) some PCB for the protector. Yet I strongly believe that such protection should always be built inside the box that needs protection!
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I've never seen a commercial radio that had a diode in series with the 12v input. Instead they put a diode across the power input so that it conducts if the input power is reversed and blows a fuse.
I like?Phil Salas AD5X idea for an over voltage AND reverse voltage protector.
Max KG4PID
On Sunday, September 4, 2022, 11:26:25 PM CDT, Ashhar Farhan <farhanbox@...> wrote:
The polarity protector is the better idea. Simply because the diode can get very very hot. The sbitx can draw upto 10A of current. Across a diode like 1N4007, the voltage drop is about 0.7V, the diode will have to dissipate 10 x 0.7A = 7 watts of power during transmit. This is one reason why we don't switch the power to the power amplifier through T/R line, the power involved is just too much. - f
Hi, Gordon
while it is true that just showing a diode into the power supply line is cheap & quick, the solution you suggested is, without doubt, a lot better. In fact, I'll order (or produce) some PCB for the protector. Yet I strongly believe that such protection should always be built inside the box that needs protection!
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#sbitx A cool (kludgy) way to remotely use the sbitx
#sBitx
First, enable ssh on the sbitx. 1. From the main menu, Choose Preferences > Raspberry Pi Configuration 2. Click on the Interfaces tab 3. On the tab and enable SSH if not enabled, Click OK 4. From a terminal on the sbitx, type ifconfig and note the IP address of the sbitx. In my case it was 192.168.1.142
Second, from your linux laptop (yeah, it wont work with windoze, it might work on a mac, let us know) 1. Open a terminal window 2. Enable remote x clients to connect with the command "xhost?+" (without quotes) 3. Next, ssh to your sbitx with a special option like this : ssh [email protected] -X
Enter your password (by default it is hf12345).
4. Now you are connected to the sbitx. Go into the sbitx directory
and execute the program like this:
cd sbitx
./sbitx
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The polarity protector is the better idea. Simply because the diode can get very very hot. The sbitx can draw upto 10A of current. Across a diode like 1N4007, the voltage drop is about 0.7V, the diode will have to dissipate 10 x 0.7A = 7 watts of power during transmit. This is one reason why we don't switch the power to the power amplifier through T/R line, the power involved is just too much. - f
Hi, Gordon
while it is true that just showing a diode into the power supply line is cheap & quick, the solution you suggested is, without doubt, a lot better. In fact, I'll order (or produce) some PCB for the protector. Yet I strongly believe that such protection should always be built inside the box that needs protection!
|
Hi, Gordon
while it is true that just showing a diode into the power supply line is cheap & quick, the solution you suggested is, without doubt, a lot better. In fact, I'll order (or produce) some PCB for the protector. Yet I strongly believe that such protection should always be built inside the box that needs protection!
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Vince, This is a stupid bug that will be soon fixed. Type? ?git reset --hard ?git pull The git reset command will override and reset the files. - f
On Mon, Sep 5, 2022, 6:22 AM Vince Loschiavo < vince320@...> wrote: I guess it updated, would like to know where to look to see if / what was updated.
Vince
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Re: Ubitx version 3 heatsink
Thanks for the info.? I have a lot to learn.
-John
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Re: Ubitx version 3 heatsink
Hi, Any extra lead length on the finals is too much.? The actual recommendation is to cut the leads short and mount the device even closer to the current PCB.? If you look at any PA design, they work hard to make the leads as short as possible, usually by having the heatsink directly under the PCB so that the leads can be as short as possible.? Here is the original IRF510 amp PCB:  73.
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I guess it updated, would like to know where to look to see if / what was updated.
Vince
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Just nasty noise...Not the keyboard..Abox mini one..pulled that out..
you can see decode is fine, but no audio.
when transmitting tones, but doesn't key transmitter. and most of the time once it does transmit, never switches the Rx back in.
ugg.
front end is very cool!
vince
n2aie
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The following files and folders have been uploaded to
the Files area of the [email protected] group.
By: Vince Loschiavo <vince320@...>
Description:
SBitx receive. Having issues sometimes with TR switching
Front end will seem like it is xmitting but not keying tramsmitter. But the. It will with FT8. Also this horrible noise and hardly any signal.
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newbie question..
when trying to do git pull to grab the new updates, I get a prompt about? your local changes to the following files would be overwritten by merge:
data/user_settings.ini
Please commit your changes or stash them before you merge.
Aborting..
so?i copied those to the desktop.
tried running it again
so did it pull the github update? and then i just build it ??did it actually grab the update,??
vince
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In our neck of the words, if a radio is important to us we build a polarity protector that connects directly to it. ?No battery or anything is allowed to connect direct again, must go through our polarity protector
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On Sep 4, 2022, at 17:24, otalado <s53c.lado@...> wrote:
?You are doing a great job with the manual!!
btw: I am afraid this is a little bit off-topic: I saw your warning on the power supply plug polarity. Wouldn't it be a good idea, to place a Schottky diode into the rig itself? Ever since I lent one piece of relatively expensive equipment that returned to me burnt beyond repair, I am always making supply cables with such protection. This is until some 'clever' guy will try to use his own wrongly wired cable. So the protection in the box itself will make better sense.
Now in this 'prerelease' period dangers are perhaps low, but as less routined hams will come that will change, I'm afraid ...
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You are doing a great job with the manual!!
btw: I am afraid this is a little bit off-topic: I saw your warning on the power supply plug polarity. Wouldn't it be a good idea, to place a Schottky diode into the rig itself? Ever since I lent one piece of relatively expensive equipment that returned to me burnt beyond repair, I am always making supply cables with such protection. This is until some 'clever' guy will try to use his own wrongly wired cable. So the protection in the box itself will make better sense.
Now in this 'prerelease' period dangers are perhaps low, but as less routined hams will come that will change, I'm afraid ...
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I also have acquired a 2nd Ubitx v6, will think about upgrading it soon, did install N8ME's firmware.
Fr Richard WB8YXF
On Sunday, September 4, 2022 at 02:16:33 PM EDT, K4LXY <k4lxy.cw@...> wrote:
Here is the YouTube video with uploading instructions
73 Howard K4LXY
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Here is the YouTube video with uploading instructions
73 Howard K4LXY
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Sorry - autocorrect got me. Farhan has the YouTube video.
H
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Vince N2AIE