I have a little more than 0.6v across base and emitter on all of them. 7.7v across collector and earth on Q10 and Q30 and 11.9v on the rest. Seems ok.
I have only unsoldered and ckecked one trifilar (T3). No short between windings. It was a pain for an old man with not so good eyes anymore and used to vacuum tubes..
H?kan
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Re: RF power chain mods and improvements..
Ok. To attenuate spurs at an acceptable level we might add a high pass filter for the 10m band. However for the 15 and 12m band I don't see an easy solution
Il 05/giu/2018 06:19, "Tim Gorman" < tgorman2@...> ha scritto: Arv,
This is how I've always operated my linear amplifiers. Tune for max in
CW and then mark that level on the oscilloscope. When in SSB never go
above that level with your modulation. It's a pretty conservative way
to operate but it's also the easiest. You don't have to worry about
trying to read a trapezoid display for linearity!
tim ab0wr
On Mon, 4 Jun 2018 15:20:24 -0600
"Arv Evans" <arvid.evans@...> wrote:
>As long as the microphone port audio input is below 45
> millivolts the spurs seem
> to be down at least 50db, but can be pushed even further down by
> reducing the audio
> level to around 32 millivolts.? This seems to be where oscilloscope
> peak-to-peak RF level
> is about the same as when using CW mode.
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Re: micro bitx: strong signals from broadcasting stations
That can be removed with a high pass filter especially if you don't mind for the 160meters band. It can be done with three small toroids and high voltage ceramic capacitors. Just put externally. You might also try a notch filter that eliminates the offending frequency. Of course all this assumes that the MW broadcast does not emit spurs on the HF, in this case you could not do much
Il 05/giu/2018 07:26, "vu3jyt" < vu3jyt@...> ha scritto: The signals from MW broadcast.
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I renamed the files excactly like the popup states and still the same error...?
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Re: micro bitx: strong signals from broadcasting stations
The signals from MW broadcast.
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Fortunately, the way git (the software used by github) is structured, it doesn't really need a server! git is a distributed source control system. that said, it does have? server mode that can quickly be setup anywhere on even a raspberry pi.? If Microsoft makes any controversial move, I can see the repositories quickly move away from them. That said, I am not sure that they have the lee-way to do much in terms of changing licensing of the hosted repositories.
- f
On Tue, Jun 5, 2018 at 9:24 AM, Thomas Sharka via Groups.Io <sharkatw@...> wrote: Corporations are not evil, they're indifferent. That makes them quite dangerous indeed. Microsoft hasn't changed all that much from their adopted philosophy of "embrace, extend and extinguish" since the 90's. If you do a little research, you'll find that most of the corporations have pretty much that same bias. If there's competition, eliminate it. If it's a small start-up, all the more so.
How's that Skype working for you? ?
On Monday, June 4, 2018 11:18 PM, "Tom, wb6b" <wb6b@...> wrote:
I certainly would not change from Git. It is a standard that is not tied to GitHub.
I also have an account on BitBucket??BitBucket and GitHub both have free accounts. GitHub bases their paid accounts on the number of repositories, BitBucket on the number of users. Often companies I do consulting for have BitBucket accounts rather GitHub accounts. BitBucket seems to have features that bigger organizations like.?
Microsoft does not seem as evil as they were in the past, but as big companies start buying and consolidating things, and the internet just becomes more of an extension of your cable company and the entertainment industry, the shape of the open internet and open source could change over time. But, that is likely a long way off.
If GitHub becomes an undesirable place to host projects, other companies will will respond with new offerings.
Tom, wb6b
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Re: The new uBITX boards are here
Jamie, Check on ebay for old GE and Motorola communication speakers. I found several of $6. You can either use them as an external speaker or pull the speaker out and mount it inside your case. The best communication speaker I have ever had was an old drive-in movie theater speaker I picked up when one was closing down and selling everything off. I wish I had bought 20 of them! tim ab0wr On Mon, 04 Jun 2018 09:42:35 -0700 "Jamie Anderson" <jamiea@...> wrote: I also found a 50 ohm version of the Visaton that Mouser carries, so
there are 8, 16, and 50 ohm versions of this water resistant
speaker.? No 32 ohm version, but if 16 or 50 would work I bet this
would be a good sounding speaker for SSB voice on this radio.
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Re: RF power chain mods and improvements..
Arv, This is how I've always operated my linear amplifiers. Tune for max in CW and then mark that level on the oscilloscope. When in SSB never go above that level with your modulation. It's a pretty conservative way to operate but it's also the easiest. You don't have to worry about trying to read a trapezoid display for linearity! tim ab0wr On Mon, 4 Jun 2018 15:20:24 -0600 "Arv Evans" <arvid.evans@...> wrote: As long as the microphone port audio input is below 45
millivolts the spurs seem
to be down at least 50db, but can be pushed even further down by
reducing the audio
level to around 32 millivolts. This seems to be where oscilloscope
peak-to-peak RF level
is about the same as when using CW mode.
|
Corporations are not evil, they're indifferent. That makes them quite dangerous indeed. Microsoft hasn't changed all that much from their adopted philosophy of "embrace, extend and extinguish" since the 90's. If you do a little research, you'll find that most of the corporations have pretty much that same bias. If there's competition, eliminate it. If it's a small start-up, all the more so.
How's that Skype working for you? ?
On Monday, June 4, 2018 11:18 PM, "Tom, wb6b" <wb6b@...> wrote:
I certainly would not change from Git. It is a standard that is not tied to GitHub.
I also have an account on BitBucket??BitBucket and GitHub both have free accounts. GitHub bases their paid accounts on the number of repositories, BitBucket on the number of users. Often companies I do consulting for have BitBucket accounts rather GitHub accounts. BitBucket seems to have features that bigger organizations like.?
Microsoft does not seem as evil as they were in the past, but as big companies start buying and consolidating things, and the internet just becomes more of an extension of your cable company and the entertainment industry, the shape of the open internet and open source could change over time. But, that is likely a long way off.
If GitHub becomes an undesirable place to host projects, other companies will will respond with new offerings.
Tom, wb6b
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You have to have 12V in the RX biDi amps Hakan.
Q10,11,12 and 30,31,32 must have 12v on rx, if not I suspect the relay K1, please check!
Raj
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Show quoted text
At 04-06-18, you wrote: To check if the trifilars are shorted I have to unsolder them, so I wait a little with that.
But I measured the 3904:s. All of them had zero volts between base and emitter.
I also measured the voltage between each leg and earth. The highest voltage was around 0.005 volt. Looks strange to me..
And I must tell it was 30 years since I was an active ham, I am 70 now so I'm a little rusty on the electronic skills ;-)
H?kan
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Hex files scare me. Nope just unpacked fhe zip file and tried to open the .ino file like I did before.
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Did you upload a hex file or actually compile the source code? There's a big difference.
Jack, W8TEE
On Monday, June 4, 2018, 11:25:54 PM EDT, kj6etl <pa1zz@...> wrote:
You mean the Arduino application?
its in the Applications folder of MacOS 10.13.5
I can upload basic sketch into the Nano. Further I used this same Application to upload the kd8cec into an other Nano successfuly.
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You mean the Arduino application?
its in the Applications folder of MacOS 10.13.5
I can upload basic sketch into the Nano. Further I used this same Application to upload the kd8cec into an other Nano successfuly.
|
I certainly would not change from Git. It is a standard that is not tied to GitHub.
I also have an account on BitBucket??BitBucket and GitHub both have free accounts. GitHub bases their paid accounts on the number of repositories, BitBucket on the number of users. Often companies I do consulting for have BitBucket accounts rather GitHub accounts. BitBucket seems to have features that bigger organizations like.?
Microsoft does not seem as evil as they were in the past, but as big companies start buying and consolidating things, and the internet just becomes more of an extension of your cable company and the entertainment industry, the shape of the open internet and open source could change over time. But, that is likely a long way off.
If GitHub becomes an undesirable place to host projects, other companies will will respond with new offerings.
Tom, wb6b
|
Where is your IDE installed? I see a libraries directory right above the sketch directory, but I don't see all of the other files that should be in the compiler directory. I think your installation of the compiler is incorrect, but I can't be sure since I don't use a Mac. Maybe someone else who has a Mac with the IDE installed can help you.
Jack, W8TEE
On Monday, June 4, 2018, 11:07:44 PM EDT, kj6etl <pa1zz@...> wrote:
Then I created this directory structure: In the Arduino menu I now see the folder but when I select it it gives me the warning "Could not create the sketch"
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Then I created this directory structure: In the Arduino menu I now see the folder but when I select it it gives me the warning "Could not create the sketch"
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Not really. Read the popup carefully.? It names the INO file raduino_diag_v3.ino and also names the directory holding that file raduino_diag_v3. As I said before, the directory and the INO file MUST share the same name, just like the popup below says. From your error messages, you didn't do that.
Jack, W8TEE
On Monday, June 4, 2018, 10:53:30 PM EDT, kj6etl <pa1zz@...> wrote:
I have no idea just following the instructions that pop up on the screen....  This is what the directory looks like after I clock OK 
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Re: Building homebrew ubitx: Need pre-v3 schematic PDF. Also, source for 45M15 (45 MHz IF) filter?
And you can make a quartz crystal daisy chain with the other seven? ?8^)??
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Re: digital modes - how to connect computer line out
It's called a TRRR connector for the new laptops and probably iPhone. 4 conductors. Mine has the plug and two short audio cables with 3 conductor plugs.
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And don't forget to disconnect the orange wire (PTT). The audio cable from the PC doesn't like it. PTT by CAT works great.
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kj6etl
Raj vu2zap
VK3HN