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Re: #sBitx Sbitx died mid transmission
#sBitx
The first thing I would do is make sure the sBitx is getting power. If you're powering it through?a fused cable or a distribution box like a Rigrunner, you might have taken out a fuse. I did that in an early session, blowing a 5A fuse while attempting an SSB transmission at 10W. (The bias adjustments were not ideally set at the time; I tried adjusting them as explained in the original build instructions, not knowing that it had already been done at the factory. Fixed now. This is also with the original 5V linear regulator still in place.) On Fri, Sep 9, 2022 at 12:05 AM scttmtclf via <scttmtclf=[email protected]> wrote: Tonight I had made15 contacts via ft8 with no issues on 40 meters through a vertical with 1.2-1 swr.? I switched to 20 meters, and adjusted my vertical till I had a 1.1-1 swr.? Mid-transmission, my sbitx shut down.? No smoke, just shut down.? I unplugged it and tried cycling the power again, but nothing.? There is no power to the pi, because the red led is not on.? Where should I begin my diagnosis? |
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#sBitx Sbitx died mid transmission
#sBitx
Tonight I had made15 contacts via ft8 with no issues on 40 meters through a vertical with 1.2-1 swr.? I switched to 20 meters, and adjusted my vertical till I had a 1.1-1 swr.? Mid-transmission, my sbitx shut down.? No smoke, just shut down.? I unplugged it and tried cycling the power again, but nothing.? There is no power to the pi, because the red led is not on.? Where should I begin my diagnosis?
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Re: #sbitx Upgrades shipped
#sBitx
William, The kit has been despatched to everyone who has bought sbitx (either models) with LM338, across the countries. - f On Fri, Sep 9, 2022, 5:56 AM William R Maxwell <wrmaxwell@...> wrote: I asked this question a few days ago but that post seems to have vanished from the earlier thread on this topic, without a response. |
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Re: #sbitx Upgrades shipped
#sBitx
I asked this question a few days ago but that post seems to have vanished from the earlier thread on this topic, without a response.
Has the upgrade kit been sent to purchasers outside the USA, Ashar? If not, I don't know how many sBITX have been purchased in Australia but I am happy to act as a forwarding point for distributing the upgrade kit to Australian owners, if that is of assistance. Bill, VK7MX |
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Re: File /uBITX_6_N8ME_2_VU3GAO_Mods.zip uploaded
#file-notice
not working for me Nitin.. cfg menu brings up some corrupt graphics. key mode not saved
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Re: #sbitx - an ugprade kit is on the way
#sBitx
I agree - The cost is not an issue as the parts are cheap and readily available.? I am just waiting because I don't want to end up buying a regulator that happens to be very noisy.
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Re: #sbitx Upgrades shipped
#sBitx
Is there any utility in adding an L-C noise filter, or would that be overkill?
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Re: Loss of CW Side tone When load N8ME Firmware.uBITX V6
Chuck, koodos on what Dave,K8WPE said. This is a Hobby. And even if it wasnt, We all started from the ground up. I remember when i first was licensed,my young brother and sister made fun of me by grabbing the ham out of the fridge everytime i set up my equipment to operate. They would say"ohhhhhhhhhhhhhh you want some mustard and cheese to go with that HAM?" Yea with their distractions,i fried some gear,but luckily it was tube type and was more forgiving.As for the solid state stuff,YEP fried loads of diodes in the power supply sections due to not ohming out the wires on the new plug i soldered on the power cord.IT HAPPENS more than anyone here wants to admit.I have even bricked a newer rig . got in there and reprogrammed a chip so i could have warc bands, and wala!! dead as a doornail. wound up having to order that particualr chip off the manufacturer . that chip cost more than the radio it seemed at the time. OOPS. We all have had an "OOOPs" in our tenure ar Amateur Radio Operators. Thats what really binds us all. telling the stories of wiping the sleep or smoke out of your eyes while trying to finish a project at 2am or whatever,and watching the smoke roll out again of the project ohh so softly.HI HI. No question is stupid, and no solution is the solution to end all problems. if it was we would never get past Spark gap transmitters and crystal radio receivers.:) Have fun, relax, and enjoy your? hobby.? There are probably about 95% of hams who build and experiment who have had OOPS times too. This is what separates the operators from the ones who actually USE their knowledge from their license . welcome 73 David ac9xh
On Thursday, September 8, 2022 at 08:40:46 AM EDT, david todd via groups.io <ac9xh@...> wrote:
Evan, I have N8ME software installed on my ubitxes,and i must say it makes the ubitx a new radio all over again. It cuts out the latency ,or delay from key close to transmit. Also it seems to me on my radio,it reacts faster. Also it eliminates the frequency jumps when tuning. Mine,is smooth. 73 David ac9xh
On Thursday, September 8, 2022 at 05:12:46 AM EDT, David Wilcox K8WPE via groups.io <djwilcox01@...> wrote:
Chuck, quit apologizing for errors!!! This is a HOBBY! ?Most of my mistakes, errors of omission and commission are now called learning experiences. ?We learn best that way. I have great tales and one of them is reverse connecting a battery (with a big red price tag stuck near the negative pole of the battery¡. You can tell the rest of the story). ?An early Chinese YouKits radio went up in smoke because of no reverse voltage protection. ?I learned a lot that late night. Now I go to bed at 9:30 PM and paint all bought batteries with a big red patch near the + pole and remove all price tags and a few other things. ?The last radio item I reversed the power to was a completely different type of error but it did have a reverse protection diode in the circuit and I had a fuse in the line¡.. just had to replace the diode¡. My first effort at changing a SMD diode¡.. Was very lucky that time. We all make errors and I have many other tales since 1960 when I was first licensed. Dave K8WPE since 1960? David J. Wilcox¡¯s iPad On Sep 7, 2022, at 11:13 PM, Chuck Eglhaut <ceglhaut@...> wrote:
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Re: Loss of CW Side tone When load N8ME Firmware.uBITX V6
Evan, I have N8ME software installed on my ubitxes,and i must say it makes the ubitx a new radio all over again. It cuts out the latency ,or delay from key close to transmit. Also it seems to me on my radio,it reacts faster. Also it eliminates the frequency jumps when tuning. Mine,is smooth. 73 David ac9xh
On Thursday, September 8, 2022 at 05:12:46 AM EDT, David Wilcox K8WPE via groups.io <djwilcox01@...> wrote:
Chuck, quit apologizing for errors!!! This is a HOBBY! ?Most of my mistakes, errors of omission and commission are now called learning experiences. ?We learn best that way. I have great tales and one of them is reverse connecting a battery (with a big red price tag stuck near the negative pole of the battery¡. You can tell the rest of the story). ?An early Chinese YouKits radio went up in smoke because of no reverse voltage protection. ?I learned a lot that late night. Now I go to bed at 9:30 PM and paint all bought batteries with a big red patch near the + pole and remove all price tags and a few other things. ?The last radio item I reversed the power to was a completely different type of error but it did have a reverse protection diode in the circuit and I had a fuse in the line¡.. just had to replace the diode¡. My first effort at changing a SMD diode¡.. Was very lucky that time. We all make errors and I have many other tales since 1960 when I was first licensed. Dave K8WPE since 1960? David J. Wilcox¡¯s iPad On Sep 7, 2022, at 11:13 PM, Chuck Eglhaut <ceglhaut@...> wrote:
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File /uBITX_6_N8ME_2_VU3GAO_Mods.zip uploaded
#file-notice
Group Notification
The following files and folders have been uploaded to the Files area of the [email protected] group. By: Nitin William <vu3gao@...> Description: |
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Re: File /uBITX_6_N8ME_2_VU3GAO_Mods.zip uploaded
#file-notice
Hello Howard,
I have fixed the minor bug of Keyer not saving. Update file has been upload to the same location in the files section. Please do try and let me know. Thanks Nitin William VU3GAO |
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Re: Loss of CW Side tone When load N8ME Firmware.uBITX V6
David Wilcox K8WPE
¿ªÔÆÌåÓýChuck, quit apologizing for errors!!! This is a HOBBY! ?Most of my mistakes, errors of omission and commission are now called learning experiences. ?We learn best that way. I have great tales and one of them is reverse connecting a battery (with a big red price tag stuck near the negative pole of the battery¡. You can tell the rest of the story). ?An early Chinese YouKits radio went up in smoke because of no reverse voltage protection. ?I learned a lot that late night. Now I go to bed at 9:30 PM and paint all bought batteries with a big red patch near the + pole and remove all price tags and a few other things. ?The last radio item I reversed the power to was a completely different type of error but it did have a reverse protection diode in the circuit and I had a fuse in the line¡.. just had to replace the diode¡. My first effort at changing a SMD diode¡.. Was very lucky that time. We all make errors and I have many other tales since 1960 when I was first licensed.Dave K8WPE since 1960? David J. Wilcox¡¯s iPad On Sep 7, 2022, at 11:13 PM, Chuck Eglhaut <ceglhaut@...> wrote:
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Re: Loss of CW Side tone When load N8ME Firmware.uBITX V6
I feel stupid. Evan in your reply to me to make sure CW was selected , Then which it was but you said about checking the config. I did here I was suppose to be Iambic B and it was in Winkey . Set it to Iambic B and save it¡¯s working.? Thanks for your help it was all my stupidness.? uBITX seem be working proper I have side tone when I am sending CW. Thanks Evan 73 Chuck K3CWE? |
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Re: Daylight again schematic error(?)
What ever the reason be, when I switched the PTO and RF input, the receiver went from dead to impressive.? I have rebuilt the two mixers three times and ended up with the same results. I finally gave up on the J310 devices and put in 40673 MOSFETs. Doing the 40673 devices resulted in a decent sounding receiver with MDS at 1 uv. However, doing that modification was a deviation from your original design and I wanted to duplicate what you put out to us. When I built the first mixer I used the bobbin toroids for the bandpass filter. The attenuation of that filter was roughly 9 db. The sensitivity of the receiver had a MDS 30 uv. I made an identical filter using Fe cores. That was about the same. I knew something was not correct. I installed a QRP labs, 40 meter bandpass filter that had an insertion loss of 2 db. The QRP labs BP filter uses link coupling for both input and output. Putting that in the front end of the daylight RX improved the sensitivity to 3uv MDS. This gave me the idea to switch the signals into the mixer, which results in a working Daylight RX.? I know for a fact my build is correct so I thought, just maybe,? an oversight in the schematic. Electronics is down right FM. Barry On Wed, Sep 7, 2022, 8:35 PM Ashhar Farhan <farhanbox@...> wrote:
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Re: Daylight again schematic error(?)
Barry, The 1K resistor? at the input of the RX mixer provides the correct termination for the bandpass filter. The bandpass filter is terminated with 1K on the mixer side and 50 ohms on the other side. If you sweep it with a nanovna which provides 50 ohms on both ends, the plot is bound to show much loss as the ending resonator is loaded down. As I had stressed in my talk, we let go of the 50 ohms standard to simply things. This is one of those gotchas. On Thu, Sep 8, 2022, 5:37 AM barry halterman <kthreebo@...> wrote: Group, I believe there is an error in the schematic of the daylight again radio. The RX first mixer has the PTO going to the gate with the high impedance input, while the RF input is going to the gate with the 1K resistor.? |
Shirley Dulcey KE1L
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