Re: A steal for Arduino Experimenters
I bought the Elegoo starter kit for $30.00 and it came with a little CD with all the files on it. ?Was well worth the money. ?You can go to the Elegoo site too and download their starter files. ?I am sure most of the starter programs are similar.
Here is the beginning page:?
The kit I have is the basic one for the Mega 2560. ?I couldn't download the file on my old iPad for some reason but you can with a real computer. ?
I am surprised you aren't getting better service from Bangood. ?I haven't had any problems with their stuff so far. ?I prefer Adafruit though as their service is fantastic.
As long as you have the kit any beginning book about beginning Arduino should give you the lessons on how to use it. ?The Arduino website itself has lots of information. ?Looking over many of the starter kits available they all have the same or similar parts. ?You just need the lessons.
FWIW, your mileage may vary.
Dave K8WPE?
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On May 28, 2018, at 9:25 PM, AG?H < [email protected]> wrote: I ordered and received the Basic Starter Kit from Bangood.? The kit, however, has no 'help' manual but a later post included a web address from Bangood to send for the free PDF starter guide.? That link did not work.? I wrote Bangood and, after two requests, received a 75mb zipped file.? I tried to unzip it and was given the message that the file couldn't be unzipped as it was corrupted.
Several requests to Bangood to send re-send the file have fallen on deaf ears.
So......has anyone received the PDF that could forward me a copy?? It would be greatly appreciated as this nubee needs all the help he can get in experimenting with the Arduino.?
Thanks,
Keith AG?H
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Re: Receive FM Radio Station
#bitx40
First check if your VFO and BFO are working correctly.
Put an oscilloscope to C100 and see if you have a good voltage of your BFO frequency. Check the frequency of
BFO with a frequency counter.
Put oscilloscope to Q7 collector and check the amplitude and frequency.
Building from scratch is good and you learn a lot more!
When you reply please do not leave the whole message as groups.io removes it and I dont know to whom
you are replying to. Please delete/remove all the unwanted text and leave the lines that you are sending
a reply.
Raj
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At 29/05/2018, you wrote: I made my own BPF and LPF because I want to make 8.456 MHz frequency as the center frequency.
Here is the schematic. To tell you the truth I didn't buy the kit from Asshar Farhan. I built in from scratch, like from the schematic, the PCB layout, and bought all the component by myself. I come from Indonesia. And this is for my final project. Still learning and this is my first time building a radio
Thank you very much for helping me
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Re: Receive FM Radio Station
#bitx40
Thank you for your reply.
I also tried to make the wire connectivity in Baofeng mic and speaker according to the post in this threads :?/g/BITX20/topic/4554574
The PTT switch in Baofeng work perfectly, but not for the speaker and mic. I will try to make the modification like you've said.
But what about the RX system? It still not receiving any ham radio signal. I tried to follow the troubleshooting that Asshar Farhan made in?
Here is what I've got
C107 (C13 in my schematic) makes noise when it's touched with cable.
C33 (C6) is also make noise
C31 (C9) is also make noise, but not very loud.
C53 (C5) I didn't hear any noise at all.?
C21 (C24) I didn't hear any noise at all.?
I also didn't hear any noise if the cable touched the antenna connector.
I made my own BPF and LPF because I want to make 8.456 MHz frequency as the center frequency.
Here is the schematic. To tell you the truth I didn't buy the kit from Asshar Farhan. I built in from scratch, like from the schematic, the PCB layout, and bought all the component by myself. I come from Indonesia. And this is for my final project. Still learning and this is my first time building a radio
Thank you very much for helping me
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Re: Raduino v1.27.6 (few small improvements) released
#bitx40
Rogier, Ralph,
the entire sketch is contained in raduino_v1.27.xx.ino
You don't need the other one (raduino_diag_v3.ino). That one is only for
diagnostics (troubleshooting any hardware issues). You may safely delete
it (or move it away) from the downloaded folder.
Hope this helps.
73 Allard PE1NWL
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On Mon, May 28, 2018 22:59, Ralph Mowery wrote: I am new to the Arduino programming ( just started learning it in
December)
.
I know how to load in the single *.ino programs to the arduino with no
problem and how to write a very simple program and get it going or change
some of them.
What I would like to know is how to load in several files. It seems to me
that some of Dr.Lee's programs have several *.ino files and they all need
to be loaded into the Arduino.
I do have his *.hex file loaded in and it works very well.
de ku4pt
On Mon, May 28, 2018 at 4:53 PM, Ralph Mowery <rmowery42@...> wrote:
On Mon, May 28, 2018 at 3:59 PM, Jack Purdum via Groups.Io <
jjpurdum@...> wrote:
Rogier:
The sketches that do *not *give you problems; do they have a single
source code file or multiple source code files? Dr. Lee's program uses
multiple source code files and he has them all labelled as *.ino files
(except for header files, of course). However, Dr. Lee's code is for
the
??BITX and the code you seem to be compiling is for the Bitx40. Which
Bitx
are you trying to use?
Jack, W8TEE
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Oscillation problems Bitx20a
I built a Bitx dead-bug-style for 40 meters based on the Bitx20a schematic but I have some oscillation problem. I set the driver bias and both final biases to 50 ma and the drive adjust about a quarter of the way up. Sofar nothing wrong.
But as soon as I connect the signal generator it starts oscillating, even after disconnecting the signal and turning the drive adjust all the way down. I use a 40A switching PSU so that should be able to handle it, my amp meter does not show any fluctuation.
There are some suggestions in the Bitx20a manual but I don' t quite know hoe to interpret them: "mounting a 220 ohm resistor between C6/R13 and the collector of Q3", does that mean leave everything else as it is and add an extra resistor between these points? Or does it mean: cut the connection going from C6/R13 to T3 and put a 220 ohm resistor in between?
The same goes for "mount a 1k resistor between the drains of Q18 and Q19". Also here, should I leave it as it is and simple add a 1k resistor over the drains of these MOSFETs or put them in line between the MOSFETs going to T2? This is not clear to me. I hope someone can advise me.
?
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Is that on a Windows OS PC?
On Mon, May 28, 2018 at 9:21 PM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: I doubt it's related.
On Mon, May 28, 2018 at 05:54 pm, Bo Barry wrote:
Its gone now. Evidently linked to the free books confusion which has been deleted.
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Re: uBITX Firmware CEC Version 1.08 Release
#ubitx
I will try to remember Jack's suggestion to atouk. This is something I need to learn when get the software installed.
On Sat, May 26, 2018 at 2:31 PM, Daniel Conklin <danconklin2@...> wrote: Ivo,
You need to look at the links Dr. Ian gives on his blog or download the manual.
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None taken,
Send me a recording of that happening in your uBitx. What is the marking on the audio chip ?
In bitx40 there is a 100 Ohms and a diode in series with the LM386 which has packed up in one of my
boards. The diode was slowly charging the capacitor and audio would return and drop out.
Raj
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At 29/05/2018, you wrote: Raj,
I meant no insult. I was confused. I see it turns out I was not being clear. I apologize. Can we please start over?
What was your idea, on the uBITX audio problem I described?
Thanks,
Dave
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Re: Simple sound card interface
#ft8
Wow, you went all out. I just used the volume controls on the sound card and the Kenwood. For the isolation transformers I am pretty sure they are Radio Shack audio transformers with one side being called 8 ohm and the other either 1000 or 500 ohm depending on the taps used.
I think it depends on where you tap into the audio out from the rig. I didn¡¯t feel like drilling another hole in my case, so I use the headphone out. To do that, I had to use a low to high impedance transformer. After that, I used a Jfet buffer and a volume pot. For the transmit side I only use a buffer and volume control. Already worked several stations on FT-8 and PSK-31.
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Re: Simple sound card interface
#ft8
I think it depends on where you tap into the audio out from the rig. I didn¡¯t feel like drilling another hole in my case, so I use the headphone out. To do that, I had to use a low to high impedance transformer. After that, I used a Jfet buffer and a volume pot. For the transmit side I only use a buffer and volume control. Already worked several stations on FT-8 and PSK-31.
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Re: Simple sound card interface
#ft8
Its been 8 years since I used PSK modulation and I remember that isolation transformers were a good idea but perhaps not absolutely necessary. I think I made a pair for both line-in and line-out. I still have them. At that time nothing else was required for I was using a Kenwood TS-440-SAT which had a jack in the back to use in lieu of the microphone. I also remember that PSK could be obtained by directly placing the computer's speaker against the microphone with the PTT held down so I am thinking that nothing is necessary for PSK beyond using isolation transformers and I don't think things have changed.?
For the other forms of digital modulation that have arrived in the past 8 years I am clueless.
On Mon, May 28, 2018, 11:13 PM Praba Karan < vu3dxr@...> wrote: I want try my ubitx for digital modes with external usb sound card and usb rs232 cable. Suggest simple interface setup for this. Are audio isolation transformers necessary in audio line?
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Simple sound card interface
#ft8
I want try my ubitx for digital modes with external usb sound card and usb rs232 cable. Suggest simple interface setup for this. Are audio isolation transformers necessary in audio line?
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Re: RF power chain mods and improvements..
I think I am confusing T10 and T11...
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Re: RF power chain mods and improvements..
Did a few more tests this morning on my 'proto' uBITX driver section. Have now hooked up the finals, RD16HHF1.?? The final stage is verbatim from the G6ALU 20W PA. Easily found with Google. To re-cap, First two stages are MPSH10's.? FET driver is a pair of 2N5109's.?? Finals RD16HHF1 pair. Mods:? 330pF across all emitter stages of the MPSH10's.? 2N5109 stage: 10R + 1nF across the 22R emitters.? All transformers as per uBITX and G6ALU. Result with -30dBm input and ~12.1V dc on the setup, measured at PA.? With ~13vdc at PA, output on 80M for example is around 20W and 18.3W on 10M. Clearly more volts is better. Power was measured with a 200MHz scope at the PA output pins.
| ? |
-30dBm in |
| 1.8MHz |
14.2w |
| 3.5 |
15.23 |
| 7 |
16.00 |
| 14 |
13.94 |
| 28 |
13.00 |
I measured harmonic output also at above levels.? All look pretty good.? If the input level is increased by 2dB then it's obvious the PA is starting to compress and harmonic levels rise rapidly. So I think around the -30dBm input level and the power above is about optimum. The following pictures are harmonic plots, 80, 40, 20 & 10M bands.. NOTE the GREEN line should be 10dB lower, representing 0dB gain.
Would like to see somebody verify my results. AND: Has anybody measured the response of the uBITX Low pass Filters? glenn vk3pe
    
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Re: Receive FM Radio Station
#bitx40
Well, it shows that if you research the Baofeng microphone/speaker it can be made to work with the rig. It also pays to be careful for the little speaker/microphones that you can buy for handheld 2 meter radios often have to have what radio they are being purchased for specified because of impedance issues. I have one where I specified the radio it was for and MFJ sent the wrong one so yes, it works but you have to turn the volume full up to hear it and yell into the microphone to be heard.
Personally, I run the audio from the speaker/headphone jack of the radio into the line-in RCA inputs meant for audio visual input found on the back of my stereo. The volume is plenty adequate and the bass output is superior to a small speaker.
On the microphone I am hearing that the gain of the amp it feeds which is a 2n3904 transistor based amp with a voltage divider biasing network is too weak. Some of the guys soldered in a resistor parallel to Re in the biasing network to increase the gain with great results. I don't have steady enough hands to make that fix so I am going to see if I can increase the signal into the base of the 2n3904 with an outboard pre-amp for the Mic. I think that I will simulate the circuitry before I assemble anything and I am in no hurry because my listening time far out weighs my PTT time.
Needless to say I am glad you have audio now and again I don't know what to tell you above what I have to solve your FM interference issue.
On Mon, May 28, 2018, 7:02 PM Jerry Gaffke via Groups.Io <jgaffke= [email protected]> wrote: I just searched this forum for Baofeng, got dozens of hits from people using it with *Bitx* rigs.
Here's one of many threads:? /g/BITX20/topic/4554574
The microphone element is electret, just like the element suppied with the *Bitx*.
If the Baofeng element doesn't sound quite right, could patch in the one supplied with the rig.
Such a tiny speaker is bound to be a compromise, I wouldn't expect much from that.
The PTT switch arrangement looks pretty good, that alone is well worth $3.
Some of the Baofeng mikes on ebay are apparently even cheaper cones, there are some differences.
There is a bunch of stuff in that mike you don't need.
I'd replace the cable, using one with 3 wires for ground, ptt, and mike into a 3.5mm phone jack.
The ground goes to the ground side of the mike, also to one side of the ptt switch.
And of course the mike wire goes to the other side of the mike, the ptt wire goes to the other side of the ptt switch.
On Mon, May 28, 2018 at 01:33 pm, Mike aka KC2WVB wrote:
I just googled the Baofeng speaker. I see it is a combination microphone/speaker that is probably used on VHF portables.
?
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Re: A steal for Arduino Experimenters
May I suggest you buy "Beginning C for Arduino, Second Edition" by Jack Purdum. He is a member of this group.? I learned a lot from it.? I found mine on Amazon. -- Lee - N9LO? "I Void Warranties"
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Yes certainly the impedance is going to change as voltage is getting increased. A rule of thumb to calculate the impedance at the transiter's drain / collector is
Vcc squre / 2Pout so as Vcc i.e. supply voltage is almost getting doubled the
impedance is going to change
On Tue, May 29, 2018 at 5:35 AM, <vu3dkk@...> wrote: Hi all,recently I saw an IRFP250 based push pull amplifier circuit.In that design they use 13.8V power supply, but I have a 27V(40A) supply in my bench.My questions are
1)Will the impedance of the amplifier change when changing the power supply?
2)If it changes.then how to calculate the load impedance of the amplifier,and thus how to design a new output coupling transformer?
(I am going to use this for 40m)
Thanks in advance ............73
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Re: A steal for Arduino Experimenters
I ordered and received the Basic Starter Kit from Bangood.? The kit, however, has no 'help' manual but a later post included a web address from Bangood to send for the free PDF starter guide.? That link did not work.? I wrote Bangood and, after two requests, received a 75mb zipped file.? I tried to unzip it and was given the message that the file couldn't be unzipped as it was corrupted.
Several requests to Bangood to send re-send the file have fallen on deaf ears.
So......has anyone received the PDF that could forward me a copy?? It would be greatly appreciated as this nubee needs all the help he can get in experimenting with the Arduino.?
Thanks,
Keith AG?H
|
I doubt it's related.
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On Mon, May 28, 2018 at 05:54 pm, Bo Barry wrote:
Its gone now. Evidently linked to the free books confusion which has been deleted.
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Re: Need help understanding a line of code in ubitx_si5351.cpp (msxp2 = ...)
#radiuno
The SI5340 datasheet says a step size of 0.001 ppb? (parts per billion).
So if creating a signal at 440mhz, you can adjust it in steps of 440e6 * 0.001/1e9 = 0.00044 hz.
Better have a stable reference osc into the Si5340 to see that kind of performance.
An Si5351 on some serious steroids.
?
Jerry, KE7ER
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On Mon, May 28, 2018 at 05:46 pm, Jerry Gaffke wrote:
resolution of ppb,
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David Wilcox K8WPE
Raj vu2zap
Allard PE1NWL
Terry Morris
Lee
Satish Chandorkar