I have an SMA to BNC cable that will go from the board to the case. Easy to disconnect.?
-- Mike AI4NS
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Re: Anyone with a Raduino for the uBITX version3 for sale?
There are several replacement boards on here. You will have to solder them up. Jim Sheldon has a good one on here, VF4PLN has a direct replacement that uses Adafruit si5351 board. You could make your own. VK2ETA, John has a wonderful diagnostic piece of software for the Raduino. You have plenty of options and lots of wonderful people to help you.?
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Re: ND6T AGC and Click kit wiring notes
A total of 864 AGC and/or Click mini-kits have been shipped so far. This is way more than i expected but that's OK .....popular circuits Don, ND6T, came up with.? Presently, I have about 20 AGC boards left from the last EasyEDA board order and about 100 Click boards left. It's been fun but it's time for me to do something else (like the SWR/Power meter as described earlier).
The new Ver 4 uBITX boards have the Click problem fixed. Therefore, after the last available AGC mini-kits have been sold/shipped, I'm going to quit and pass the torch to someone else. Order rates have dropped off some, so maybe everyone who wanted a mini-kit has one ??
The AGC board and Click board Gerbers have been uploaded to the files section under my call.
"On order" and "shipped" information is available in the "Files" section under my call.
73 Kees K5BCQ
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Re: End Fed antennas w/ uBITX
#ubitx
Warren,
I think many have being following the thread many from afar.
It would be great if everyone could have access to the data that are
interested in it both now, and who come across the thread at a later
date.
Rather than dealing it out individually, perhaps create a folder in
the files section of IO Groups and you just have to post it once.
(It's what it's there for.)
Alan
On 31/07/2018 11:38, Warren Allgyer
wrote:
toggle quoted message
Show quoted text
I have returned home from vacation and now have better access
to some of my files.
In March of this year I had an extensive email exchange with
Bob Allison, WB1GCM and Joel Hallas, W1ZR, the authors of the
2016 review of the MyAntennas EFHW. I have supplied that full
email exchange to Jerry and Allison but I have chosen not to
post it here because of its size.
In that exchange however were some data files that I would like
to share with the group. These document the transformer losses
in this system when properly terminated in a resistive load. In
actual operation these losses would be the best case and would
be experienced only when the antenna is a resonant multiple of a
half wave. The losses when not terminated in a 2470 ohm
resistive load, which would be the case if the antenna were used
on any band other than the single resonant band, are far higher.
On the order of 8 - 10 dB.
I would be happy to send the entire email trail to anyone who
wishes to see it by private email. In it the test methodology
for the article, which I found lacking, are discussed
extensively along with my own tests.
WA8TOD
?
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Re: Spurious RF at beginning of CW transmission in the uBitx
Bob :?
Excellent catch !?
I took a peak at the corresponding portion of the BITX40 schematic and C114 (47u) performs the same function in the BITX40 as C52 does in the uBITX.
The interesting thing to note is the presence of D18 (IN4148) in the BITX40,? almost exactly as describe your "fix". It is there to block the discharge of this
capacitor onto the RX line.?
Thanks for figuring this out !
Cheers
Michael VE3WMB?
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Re: End Fed antennas w/ uBITX
#ubitx
Thanks Warren, I think you shed really the light on the topic. Also it is consistent with the ARRL Antenna book. A 49:1 transformer can work efficiently only on some specific points, otherwise either you see a very high SWR, or you don't see that high SWR because the 'SWR transforms into heat'. It's 'an accounting principle, or a if you prefer a principle of conservation'... If you use a 49:1 transformer and you find that at 1/4 lambda the SWR is not close to 100, than you risk to melt the transformer. The efficency on random frequencies cannot be much more than just a wire connected to the 50 ohm antenna output of the radio. The only difference is that you see the high SWR in the latter case.
Il 31/lug/2018 12:38, "Warren Allgyer" < allgyer@...> ha scritto: I have returned home from vacation and now have better access to some of my files.
In March of this year I had an extensive email exchange with Bob Allison, WB1GCM and Joel Hallas, W1ZR, the authors of the 2016 review of the MyAntennas EFHW. I have supplied that full email exchange to Jerry and Allison but I have chosen not to post it here because of its size.
In that exchange however were some data files that I would like to share with the group. These document the transformer losses in this system when properly terminated in a resistive load. In actual operation these losses would be the best case and would be experienced only when the antenna is a resonant multiple of a half wave. The losses when not terminated in a 2470 ohm resistive load, which would be the case if the antenna were used on any band other than the single resonant band, are far higher. On the order of 8 - 10 dB.
I would be happy to send the entire email trail to anyone who wishes to see it by private email. In it the test methodology for the article, which I found lacking, are discussed extensively along with my own tests.
WA8TOD
?
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Re: Anyone with a Raduino for the uBITX version3 for sale?
Roger, it sounds like you may have the resistor wired wrong. See this page :?http://ubitx.net/wiring-up-a-paddle-and-straight-key/
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Re: Anyone with a Raduino for the uBITX version3 for sale?
Hi Rodger,
I have attached a screenshot of an email I received from hfsignals.
$35 US for a replacement Raduino board.?
Regards, Malcolm EI8FH?
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Re: End Fed antennas w/ uBITX
#ubitx
I have returned home from vacation and now have better access to some of my files.
In March of this year I had an extensive email exchange with Bob Allison, WB1GCM and Joel Hallas, W1ZR, the authors of the 2016 review of the MyAntennas EFHW. I have supplied that full email exchange to Jerry and Allison but I have chosen not to post it here because of its size.
In that exchange however were some data files that I would like to share with the group. These document the transformer losses in this system when properly terminated in a resistive load. In actual operation these losses would be the best case and would be experienced only when the antenna is a resonant multiple of a half wave. The losses when not terminated in a 2470 ohm resistive load, which would be the case if the antenna were used on any band other than the single resonant band, are far higher. On the order of 8 - 10 dB.
I would be happy to send the entire email trail to anyone who wishes to see it by private email. In it the test methodology for the article, which I found lacking, are discussed extensively along with my own tests.
WA8TOD
?
|
Re: Spurious RF at beginning of CW transmission in the uBitx
Hi Arv,
I have not played with the radio much on SSB but suspect that is probably the cause for the "BITX Click". Simply adding a diode in series with R66 (cathode toward C64) should fix the problem.
It is important to note that the possibility of brief oscillation could occur in both the 12 and 45 MHz bidirectional IF amplifier stages because of the back feeding of power from C52 and C64 during RX-TX and TX-RX transitions. Diodes added in series with R52 and R66 should eliminate that possibility. The values of remaining bypass capacitors (0.1 uF) in the IF amplifiers and associated discharge paths should result in extremely short time constants and should not be an issue.
Cheers and 73,
Bob N1KW
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Hello Folks,
i bought an BITX40 v3 from?. I don't have any folks that can send signal with good quality transceiver to calibrate my bitx.
I have an oscilloscope with frequency meter, and what I'm trying to do is to calibrate VFO and BFO (Mod from?) to proper frequencies.
Please, provide me an information how can I do that operation properly, if I can do it at all.
Regards,
?ukasz SP7WKY
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Pic. a bit out of focus but possible to fit coax cable to the connector.?? Crimp the terminals by hand and solder as well. Advantage also that you can unplug the cable if you need to remove the PCB. 
On Tue, Jul 31, 2018 at 02:10 PM, Nick VK4PLN wrote:
Great idea,
Do you think it makes a difference??
How about using coax instead for the normal wires?
Cheers
Nick, VK4PLN
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Re: uBITx V3 Stuck in Transmit
#ubitx
When you plug back the top connector the resistance should not change.
Since the resistance is changing it means your key jack wiring is the problem.
If you wired a stereo socket for a paddle and plugged in a mono plug then
you will be shorting the middle connection.. and keying up the TX.
For RX the key line must have 5V through the 4.7K.. if the voltage drops
then the Nano will key up the TX.
Check!
Raj
toggle quoted message
Show quoted text
At 31-07-18, you wrote: The plug on top of the Raduino.
--
Kind Regards
Rodger - ZL1RAH
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Re: uBITx V3 Stuck in Transmit
#ubitx
The plug on top of the Raduino.
--
Kind Regards
Rodger - ZL1RAH
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Re: uBITx V3 Stuck in Transmit
#ubitx
Rodger,
Which is the "digital plug" that you pulled off ?
Raj
toggle quoted message
Show quoted text
At 31-07-18, you wrote: Hi Raj
I checked for a short. When I pull the digital plug off and measure resistance between the blue and green wires, there is 4k7 there. When I plug it back into the digital port, the resistance is very small.(1k18)
I'm not sure if there is something funny with that raduino board, but maybe. I have nothing to compare it to. Thanks for the help.
--
Kind Regards
Rodger - ZL1RAH
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Anyone with a Raduino for the uBITX version3 for sale?
Hello all
How can I get a new raduino for my uBITX version 3. I'm almost sure the one I received from India is stuffed and I don't think they sell it separately.
Perhaps Ashhar Farhan, VU2ESE can let me now things to test on the board.
The condition is it has the 4k7 resister across the blue and green digital connection, but it goes into CW TX as soon as it's booted. I've tried removing the raduino from the radio and it's the same condition. Tried reloading the sketch, same issue.
Any help will be much appreciated.
--
Kind Regards
Rodger - ZL1RAH
|
Re: uBITx V3 Stuck in Transmit
#ubitx
Hi Raj
I checked for a short. When I pull the digital plug off and measure resistance between the blue and green wires, there is 4k7 there. When I plug it back into the digital port, the resistance is very small.(1k18)
I'm not sure if there is something funny with that raduino board, but maybe. I have nothing to compare it to. Thanks for the help.
--
Kind Regards
Rodger - ZL1RAH
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Re: CW keyer issues#ubitxcw
Mike you need to remove the 4.7K resistor from the tip and connect it to the blue wire. That will st your jack up for paddle operation. The 4.7k resistor set the keyer pin high which keeps it in receive. This input is an analog input that looks for variations in voltage to set different states, receive, transmit, TX dits, or TX dahs.
toggle quoted message
Show quoted text
On Jul 30, 2018, at 23:08, Mike Short < ai4ns.mike@...> wrote: I am having issues with the keyer.? I will only use paddles for CW. Tip is dit, I connected the 2.2k to it. The middle contact is dah, connected the 10k to it. Other ends of the resistors are soldered together with the blue wire. The 4.7k is connected to the dit, and them to the green. What did I do wrong? I only get dahs,?
--
Mike
AI4NS
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Re: Spurious RF at beginning of CW transmission in the uBitx
Raj had a nice simple fix for the carrier burst on the Bitx40, might be applicable to the uBitx:?? ? ?? /g/BITX20/message/33707? ?? /g/BITX20/message/33742As I recall, there were a half dozen other fixes that worked. We've already mentioned delays in software as Allard has done for the Bitx40.
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I thought of that, but I don't have a Molex crimper,? and it would be more work in my opinion.?
--
Mike
AI4NS
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Alan de G1FXB
Raj vu2zap
Skip Davis