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!
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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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Art
Bahrain has a good video about loading software on the V6 on YouTube. ?Main thing is getting it in the right subfolder and with the right folder name.
There are a couple of versions of the software. ?The ones I have include a couple of fixes for CW speed readout, etc. ?The one I'm using is named, at least on my computer, as uBITX_6_HI_VIZ. ?Email me if you can't find it.
73 Howard K4LXY
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yes, me also Howard.. just about to load n8me software
Do I just load the ino file to the? raduino, compile it and then upload to uBITX (V6) ??
Also going to try the sota dsp kit module, interested to
?see how you get on..
regards Art G3XNE
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Re: Daylight again radio audio filter
Sorry ? Sent from for Windows ?
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From: Raj vu2zapSent: Sunday, September 4, 2022 9:04 AM To: [email protected]Subject: Re: [BITX20] Daylight again radio audio filter ? Barry, The values presented by me is for everyone building and not a solution to your issue but it may improve it. Please look for component issues, if pop corn noise if present is a component failure. Raj On 04/09/2022 5:44 PM, barry halterman wrote: Raj, the MDS at 7MHZ is 10uv. A 50uv signal is as loud as the mixer noise. Barry ? Sent from for Windows ? ? The original on LTSpice turned up with a 10KHz roll off which is too high. So changed values with suggestions from Farhan till it looked right at 3-4KHz. This should reduce high freq whines and hiss. Raj On 03/09/2022 7:03 PM, barry halterman wrote: Raj, Thanks for the information on the sullen-key filter. I never heard of this design before and found that it has been around for quite some time. Just goes to show the amount of intellect in this group. 73 Barry ? Sent from for Windows ? ? ? For better results change the following values and try: ? R27, 28, 31, 32, 35 & 36 to 2.2K ? C32, 33 & 37 to 0.047u or 0.05u ? C51,53 & 55 to 0.01 ? The filter is Sallen key low pass and after mod will have ? roll off just below 5KHz ? ? Raj ? ? ? ? ? ?
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Re: Daylight again radio audio filter
Correction Raj,
I found them in a post that I missed.?? Thanks for the new values.
73 Dave WA5DJJ
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Vince N2AIE
