Re: Search 433,9 mhz transformer
Hello,
I think I found what I wanted.
You can do one with various modules that you can easily find
Seen on the HBFE group /g/HBTE/filessearch?q=tinysa
The title is a bit misleading with that of trade.
Well, after a few Euros, and if you don¡¯t want to get tired you can buy TinySA all done.?
On the other hand, does the commercial one have a USB socket and can run it on a laptop with some sotfware for example?
cdt
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uBITX V3 and V4 , Nextion and KD8CEC firmware For Sale on Ebay
#ubitx
I'm selling my uBITX V3 and V4, both with Nextion display and KD8CEC firmware.? Fully assembled with aluminum enclosure, working.?and .
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Re: Search 433,9 mhz transformer
Thank you, David, for taking the time to study this.
As Arv referred me to the HBTE forum, I think there are more "contentporary" examples than this one which dates back to 2010.
I will look closely to see if there is a complete project.
My request is not very demanding a spectral analyzer up to 300 MHZ is enough for me. (With possibility tracking for tsting filters)
cdt
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Re: Search 433,9 mhz transformer
If you are just looking for a coupling transformer that will couple signals at?
433.9 MHZ, then you could build your own with just a few turns for primary?
and secondary.
Taken at face value, the question looks like it is asking for a transformer to match impedances at 433.9MHz? My electronics knowledge comes from an aged mechanical engineering background and the only things I know about transformer design are V1/V2 = N1/N2 and N1/N2 = sqrt(Z1/Z2).? Transformer power/frequency/core/gauge/efficiency design criteria are a bit mysterious.?? Looking at the referenced circuit diagram and datasheets, I can see that IC1 has a 1500 ohm output impedance, and IC2 has a 500 ohm input impedance.? I'm not sure of the impedances of the circuitry between the two transformers (MF2 for R8 1K : 500?), but maybe they only need a transformer that has the 7:3 turn ratio as shown on the diagram, and need advice on a core that would work for 433MHz.? 
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On Tue, Jun 15, 2021, at 08:40 PM, Gerald Sherman wrote:
2nd question - what is the colour code in the auxiliary audio connector cable?
Hello Jerry,
Justin answered your question on the supply voltage.? For the v6 I would not go much above the nominal 13.8 volts.? The 5volt regulator can get really hot above that and shut down. As to your question on the color code, here is an old wire-up web page that is still correct for the two headers that were used to wire up the parts that were no on the original v3 to v5 boards.? Those are the "controls" and "audio" headers: The wire colors are on that page. Can I ask what you want to do with the connection?? There are many members on the group that may be able to help with your intended hack. Have fun with both operating and hacking the ?BITX! 73 Evan AC9TU
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Gerry - I have been using mine for 5 months without issue and it's always been on 13.8V.
73,
Justin B.
KI5GKD
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I have a couple of questions about the 'V6.? I recently got one and assembled it, but I haven't powered it yet.
1st question - can the radio safely be powered from a 13.8 volt supply?
2nd question - what is the colour code in the auxiliary audio connector cable?
Thanks
Gerry Sherman
Sent by the Thunderbird
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Re: Let's Promote bitxmap.com Re: [BITX20] bitxmap.com and mark your spot in the world
toggle quoted message
Show quoted text
On Wed, May 19, 2021 at 9:49 AM David Barber < wd8ajq@...> wrote:
Let's Promote
Can HF Signals put an announcement and link to BitxMap on their web site?
At the end of these emails have a link and some text about ?
It would be neat with our UBitX connected to our PC's, there would be an app to directly update Bit Map from the UBITX.
Let's keep BitMap going.
Dave WD8AJQ ?
5 If you are new here you probably have no idea what I am shouting about.? In addition to this list, we have a map at? where you can mark your location and see the worldwide span of the community you are now part of as one of us.? Go check it out at
--
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Re: Question re transceiver kit UBITX v6
Let's troubleshoot and maybe its something simple. You transition seems to have been from off to receive when this occurred. Trace the path from 12 volt input to the big 5 volt regulator. It could even be the on switch that failed, or a wire fragment could have created a short circuit, taking out the fuse. I would check the path first with no dc input, with an ohmmeter before connecting it to voltage. Sorry for the extra adventure, and I am hopeful its something simple with little damage. Do engage Evan as you follow his deeper instructions.?
Curt
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I just renewed for another year.? This is your friendly reminder that everyone is welcome to add themselves to the map.? As always if you have questions or problems just let me know.? You do need a google account to edit it so if you don't have one and don't want one but want to be on the map reply privately and I will add you.
For those of you that are not familiar this is just a domain redirect to a shared google map.? I am more a chainsaw than a scalpel guy when it comes to this sort of thing so if you can do better and want to just say the word and I will happily relinquish my digital cartographer's hat.
Doug
AC9RZ
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Re: Question re transceiver kit UBITX v6
VE3DLG,
I have not read of this issue on this forum, though others may have experienced it.?? You can send an email to support@...,?though not sure that there is a warranty.? Hard to warrant kits as there are too many possibilities for the builder to do something outside of the capabilities of the device. The first thing that comes to my mind is that your power source for the radio might have sent a surge that then caused the 5volt regulator to fail.? I would start by verifying the 12volt and 5volt supplies.? You will need to download the schematic to trace the power lines to the display. Verify that there are 12volts on the P1 power connector on both pins 1 and 2.? Then measure the 5volt on pin 6 of the Controls header (the one that goes to the tuning encoder).? The Raduino schematic is here: If you do have the 12volts, then remove the display and Raduino (the 2 boards that are held together with the standoffs) and connect a 5volt USB supply through the USB port on the Nano.? If that will power it up, then there is an issue with the mainboard.? If not, then you will need to load the Arduino IDE from Arduino.org, remove the Nano from the Raduino, and verify that the nano will connect and power up.? Do not try to change the program at this time.? You need the original software prior to downloading anything to the Nano.? I am just suggesting we use a different power source to see if the Raduino with the display will come up. Ashhar Farhan, the main developer of the HFSignals ?BiTX, has a video of how to upload a new Nano program, though this is the last resort. NOTE: If you need to install a new Nano, then you will need to calibrate the ?BiTX as the calibration values are stored in the Nano.? Updating the program does not change these values. The two most common causes that I have seen for the issue you describe are the Nano fails, or the 5volt regulator fails after the simple power supply issues are factored out.? Depending on the problem, you would need a new Nano or new regulator if not a mainboard issue. Good luck with finding your issue. 73 Evan AC9TU
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Re: Search 433,9 mhz transformer
Gerard
I started the HBTE group several years ago because a couple of test equipment projects were taking over all the BITX20 group bandwidth. Activity on HTBE has not been as high as anticipated but it has been
a meeting place for several projects and a place for discussion and
troubleshooting of several homebrew test equipment designs.
At inception I ask for volunteer moderators, so now the group is
managed by one of those volunteers.? Same situation with the
Arv _._
On Tue, Jun 15, 2021 at 10:44 AM Gerard < kabupos@...> wrote: Thank's your your answers
For this moment project is on stand by
Arv
I joined the HBTE group
Lots of interesting things to read
but not tonight, it¡¯s soccer Lol
cdt
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Re: Search 433,9 mhz transformer
Thank's your your answers
For this moment project is on stand by
Arv
I joined the HBTE group
Lots of interesting things to read
but not tonight, it¡¯s soccer Lol
cdt
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Re: uBitx as IF rig for transverter
Hello John,
OK the 6dB attenuator between the antenna output of the ?BITX and the 28MHz output of the transverter without separation between TX and RX (28MHz side).
LNA in RX transverter input side 144.
For a better performance in RX, the LNA would be better to place it directly under the antenna with a couple of coaxial relays, but be careful, in this case the TX switching of the ?BITX + transverter system must take place after the switching of the LNA (sequencer) to avoid replace the MOSFET or MESFET very often!
73 de IW4AJR Loris
On Tue, Jun 15, 2021 at 04:17 PM, John Kemker wrote:
Thank you very much, Loris!
?
Now, to make sure I understand you fully, you're recommending?I put a 6dB attenuator with no T/R switching between the uBITX and the transverter?? Don't sweat the 6dB attenuation?I'll see on the input, but put an LNA (Low Noise Amplifier) style preamp between the antenna and the transverter?? Or, should I place the LNA someplace else?
?
FYI, the transverter (a Microwave Modules 144/28 model) has the ability to split out receive and transmit, if desired.
?
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Question re transceiver kit UBITX v6
I received the above transceiver kit, and completed the assembly and had it working.? Connected it to a G5RV, with a 1.1 SWR.? ?It received and transmitted very well, but after 6 uses, when I turned it on there was a flash on the screen and it went dead.? ?
Has anyone else had this problem and if so, was it solved?? ?
Or, I wonder if there is any warranty on the board, or if I can obtain another one.
Thanks, look forward to your reply.
VE3DLG
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Re: uBitx as IF rig for transverter
Thank you very much, Loris!
Now, to make sure I understand you fully, you're recommending?I put a 6dB attenuator with no T/R switching between the uBITX and the transverter?? Don't sweat the 6dB attenuation?I'll see on the input, but put an LNA (Low Noise Amplifier) style preamp between the antenna and the transverter?? Or, should I place the LNA someplace else?
FYI, the transverter (a Microwave Modules 144/28 model) has the ability to split out receive and transmit, if desired.
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Re: uBitx as IF rig for transverter
Hello John,
the simplest way to solve any power problem transmitted by the ?BITX to the transverter is to insert a FIXED ATTENUATOR on the TX input of the transverter that brings the level from about 5W output to the required 750mW (about 8 or 10 dB of attenuation).
A dispassionate advice, dictated by the experience of almost 50 years of OM, is better to also insert a 3 or 6 dB attenuator also on the reception side so as not to overload the RX input of the ?BITX and generate unpleasant intermodulations.
Basically (except checking that the output to the Tranverter is correct) putting a 6dB FIXED ATTENUATOR with a power of 5 or 10 Watt between the ?BITX and the Transverter, you should have an optimal coupling.
If you think that 6dB of attenuation in RX (medium frequency for the transverter) is too much, remember that it is always better to act on the input amplification of the tranverter with an amplifier and low noise that increases the sensitivity of the whole system that also improvs the S/N ratio ?and that (in medium frequency) a lower amplification is useful to reduce intermodulation disturbances.
A dear greeting from IW4AJR Loris
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Re: uBitx as IF rig for transverter
Curt, that was my first step, before posting.? However, I'll admit, I just searched the site, not the entire web.? I'll try that and see what crops up.
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You can reuse the antuino code (v2.2) most of it is there, minus the UI and the second oscillator (which is fixed anyway) - f
On Tue, Jun 15, 2021 at 3:42 AM David Cooper KV4FP < coopers04@...> wrote: Thank you for your help.? Have started installation of the 5351-- have an Adafruit board on hand.? Some other priorities have intervened but will report back when there is some progress.
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David KV4FP
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On Sat, Jun 5, 2021 at 08:34 AM, Tom, wb6b wrote:
I'll see if I can google around and find the article again.
HI, I have not found anything that looks like the original article I read. However, if you are stranded on an island and you feel confident in the information you may find on Wikipedia on building a boat, it looks like you can download a copy to keep with you, with only 83GB of storage. Don't know if that is only the text or if the images are included. -------
| wikipedia (English) |
en |
83G |
2021-03 |
all maxi |
------- Tom, wb6b
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Gerard
Loris Bollina