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Re: Raduino Replacemnt, COMING SOON!
R. Kuehn
You should check out tindie.com they are set up for small sellers and more geared towards electronics than Etsy. Ralph N9WTX
On Sun, Mar 18, 2018 at 22:13 Nik VK4PLN <nickpullen@...> wrote: Hi Everyone.
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Re: #ubitx-help
#ubitx-help
Tom VE3THR
Nice job on the layout Ron. Like Mike said, try some 0.1uF caps on the 5V raduino regulator. I didn't see the 4.7K pull up resistor on pins 2&3 of the raduino either. Try another spkr direct to board - no jacks and no grd on the black wire. Same noise with mic disc'd? keep power and signal/audio wires separate - not bundled. Move spkr away from display? Try running off a 12 v battery - pure DC. I had to add a 1000uF electrolytic cap across the DC power on my BITX40 to null the "clicks". Volume control wired correctly?
Good luck and let us know how you make out. Thanks for the audio clip! 73 Tom VE3THR
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Re: #ubitx-help
#ubitx-help
Brian L. Davis
I see that you have enclosed wiring in a tubing, did you twist the wires before sliding into the tubing.
It seems that if you don't twist the wires or replace with shielded wiring there is a lot of digital interference that can be picked up by the circuitry. I twisted the wiring tightly and then wire tied the lines in place, I get a little tick on tuning but with any signal it is not a problem.
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Re: Raduino Replacemnt, COMING SOON!
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Re: Another uBitx Add-on PCB.
Peter, please see: https://vk4pln.blogspot.com.au/2018/03/vk4pln-ubitx-add-on-boards.html
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Re: RD16HHF1 power curve flattening...some
MVS Sarma
I fear the coupling is thro power line. Please try star mode power line distribution.if possible have a Inductor based "pi" filter for the independent stages in power feed. Regards MVS Sarma
On Sun, Mar 18, 2018 at 1:57 PM, Glenn <glennp@...> wrote: Nik,
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Best way to test power before final
Fokko PH0KKO
I have built the Bitx20 for the best part, only the final stage with IRF510 remains. Before I start building the final I would like to check if everything works fine sofar. The reception is great but I am not sure what the peak-peak output voltage on tx should be. I have an oscilloscope and a simple 1 kHz sine wave generator. I intend to feed a signal in (using a 100 nF coupling capacitor) at the mic input of about 20 mV (or more?) but I can adjust that if needed. What (ball park) output voltage is required and should I terminate it with a 50 ohm resistor when checking on my scope?
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ubitx michrophone
joseph.cunningham50@...
hi i have finished boxing up my ubitx and all working ok,not sure on michrophone as i have to shout into electret to get any power out,would it be ok to fit 5 volt regulator to supply power to normal electret circuit
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Re: antenna tuner for uBitx
Curt M.
I use my LDG Z-11ProII with an end fed wire and my Bitx40. The tuner only requires 100mW of signal to auto tune.
http://www.ldgelectronics.com/c/252/products/21/9/1
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Re: antenna tuner for uBitx
Bert N8NN
The LDG Z-100Plus tunes with only 100mW of power. It holds eight AA batteries internally, making it ideal for portable QRP operation. Small, light weight and self-powered.
Bert N8NN
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ubitx videos
This is my channel with some videos about ubitx, the language is in Brazilian Portuguese. https://www.youtube.com/channel/UCEHvfCPbNvfmeqj3srgpxNw
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Re: antenna tuner for uBitx
While I agree somewhat I am not in favor of an automatic antenna tuner because if your wire (especially with a new antenna or experimental antennas) and supporting arrangement leave you without a close match the time it takes the automatic tuner to get a match it may be too long out of tune and blow your finals. With a manual tuner you can key down for a short time while tuning, let it rest a few seconds, try again getting closer, and finally get your match. Keeps the finals cool and prevents the smoke from being released. I have a Z 11 Pro and while I have not blown any finals I am very touchy with my antennas and check them with an analyzer before using it, just to make sure I am close. I prefer a small Z match like the Emtec, 4SQRP tuner, GQRP tuner, etc. At the home shack I use an MFJ 300 watt roller inductor tuner. The reason I like manual tuners at home is I can look at the numbers on the dials and if they are different from what I usually see I look for antenna trouble, ie., antenna down, ice coated, wrong antenna, a short somewhere. With the automatic tuner it just tunes and you don't know if its the antenna or the tuner that is making your xmtr happy. And even at 5 watts or less we can fry a 510. I admit I am a nerd and like to tinker versus those who like to "just get on the air and make a contact". My preference. This is a wonderful hobby and we all are different. Dave K8WPE
On Mar 19, 2018, at 6:37 AM, Curt M. <Kc3hjp@...> wrote:
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Re: Best way to test power before final
kc0wox Leeper
Exactly which version of the bitx do you have? bitx version 3 from Sunil? If so, here's a place to start.
http://golddredgervideo.com/kc0wox/bitxver3/bitx20version3.htm Leonard
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Re: Best way to test power before final
kc0wox Leeper
I believe I found the answer in my youtube comment. It looks like you are building a bitx20a from scratch. A good place to look to answer your questions is http://golddredgervideo.com/kc0wox/bitxkitsigtrace/txscope.htm and http://golddredgervideo.com/kc0wox/bitxkitsigtrace/signaltraceindex.htm
Look at The scope probe will be de tuning the basdpass filter while connected to this point. The final tuning of C14 and C18 should be done with the scope connected either at the junction of Q20-R83 or at the dummy load after adjusting the PA bias The junction of Q20 and R83 going into the pa should have at least 800mv's amplitude. Leonard
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[wsjt-devel] WSJT-X v1.9.0-rc3: Testing of FT8 DXpedition Mode
Attached please find the announcement from wsjtx group by Joe Taylor. Please find the mention about ubitx connectivity with wsjtx. I think now the Raduino as well as other versions will be able to connect to wsjtx. This would be a great combination of ubitx with wsjtx making the portable operations in ft8 mode. Please note that ft8 now has some great features as dxpedition mode. Vu2spf Bhatnagar ---------- Forwarded message ---------- From: "Joe Taylor" <joe@...> Date: 19-Mar-2018 7:41 PM Subject: [wsjt-devel] WSJT-X v1.9.0-rc3: Testing of FT8 DXpedition Mode To: "WSJT software development" <wsjt-devel@...> Cc:
The WSJT Development Group is pleased to announce a third Release Candidate of WSJT-X Version 1.9.0. A second release candidate, v1.9.0-rc2, has been tested in the field over the past three weeks, including a public test of FT8 DXpedition Mode conducted on March 6-7.
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Re: #ubitx-help
#ubitx-help
Tim Gorman
Ron,
Unsolder your speaker leads, twist them tightly together and resolder them to the speaker. See if that helps. Try a .01pf capacitor between the solder lugs on the speaker. See if that helps. As someone else suggested, unsolder your speaker leads, pull them out from under the display, and then connect them to a speaker outside the case and see if that helps. tim ab0wr On Sun, 18 Mar 2018 16:16:28 -0700 "R S via Groups.Io" <rons8=yahoo.com@groups.io> wrote: Opinions of help needed badly here. About the 5th or 6th time I have
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Re: #ubitx-help
#ubitx-help
David S
Ron
I agree with all the previous comments about your wiring, it does need sorting. Looking at your photographs I think your speaker impedance is 4 ohm, the one I have looks the same type but is unbranded. A 4 ohm is too low for the TDA2822 on 12v, on audio peaks it's going to exceed the output capability of the chip. I've changed C77 to 22uF and fitted a 47R load, using that point as an audio feed for both a digital interface and one of the cheap TDA2030 modules from China that are on Ebay. That completely changed the audio on my 1st batch board with an FCI TAD2822. Although I don't think that's the cause, in your recording it's sounds like "motorboating", that's a type of low frequency oscillating usually due to instability in the power to the audio amplifier. When the received audio starts, it suddenly pops up and is very clear despite the oscillation. If that's your normal background noise level I think your quick lucky, mines terrible, comes with living in a built up area. Regards David G8DJM
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SSM2167
#ubitx
Many years ago I built the BITX40 kit. It was the one with the red LED display. I am now waiting for my uBITX to be shipped. I built a SMM2167 microphone amplifier/compressor on my own board for my X1M transceiver but do not have it any more. I ordered a SMM2167 on a red board from China on eBay. As suggested I will be putting a 10k potentiometer on the output for adjustments .Has anyone tested the input voltage from the microphone with a loud "AAAHHH" and then read the voltage on the output after getting good reports from other Hams? I would like to get it adjusted close before testing with other Hams.
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Re: RD16HHF1 power curve flattening...some
Lawrence Galea
Any rf decoupling at mic input and amp output?
On Mon, Mar 19, 2018 at 12:06 AM, Nik VK4PLN <nickpullen@...> wrote: THanks Glen.
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Replacement vfo
Richard E Neese
who was it that made the replacement vfo for the bitx40 ? I wanteed to see the other vfo he was working on
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