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Re: Ubitx V3 Please Help, ANTENNA Pins on PCB have SHORTED no Receive #ubitx #ubitx-help


 




?OHH!! I look here at this post and can see many answers !! First I must say THANK YOU THANK YOU THANK YOU @ all 3 People here who helps me so much!


On Sat, Aug 25, 2018 at 04:38 AM, Howard Fidel wrote:
Fabian:
If you look at he schematic, you will see that the antenna connects
to T2 through the relays and a Low pass filter. It should present a DC
short. However for RF this is OK since the transformer is normally
not a short
Ah Ok thanks now i understand this.. Yes ok i know now again: you will always learn new things in life.

If you could describe your problem in more detail maybe we can help you. Does your Raduino work? Do you hear any signals? Etc.Howard
Yes the Raduino works,.. I think it works when the LCD screen works and the menu is operable, just as I see it in youtube videos in others, so should work it??

Sound works, the TDA2822 FCI Chip seems to be ok and not blowed when i can hear a rushing sound. and i only heared somethime a am radio station from a few thousend km far away.. lol, on this day i thought, it goes be alright and i can hear ssb signals in next time but no ssb signal ever heared.. and i can hear tones like a jt65 sound or so at 10.098 Mhz a few times.. all others that i heared was only "piep pieeep" like a space computer sound, sorry for my description but i think you know what i mean..


On Sat, Aug 25, 2018 at 04:41 AM, Bill Cromwell wrote:
Hello Fabian,If you trace the circuit from the antenna it will lead you through several relay contacts to an inductor to ground. That is a piece of wire that wraps around and around with or without a core. Your meter uses direct current to measure resistance and continuity. Direct current sees any inductor as a plain old piece of wire - a short. So it sees that inductor to ground as a dead short. At RF frequencies however, it is NOT a short. Most - maybe all - radios will have this:)
Ok thank you, too now i am know this and i'm verry happy to know everything new from HAM and Radio technics.

So you should continue looking elsewhere for the problem.Have you completed the "alignment" steps? If the oscillators are far off frequency the radio will not work very well if at all.
I tried to set the BFO in the menu by display and the IRF510 (RVF2 + RFV3) current to measure and adjust with a screwdriver, but I still needed help. And I would have to readjust the Raduino on the knob (P2) but I would also need some tips for that.

Do you have a more experienced ham there who can help you?
Not really.. But today, later he say, a Ham would help me to test a few transmissions from him to me and i should say when receive..

Fabian, we all have or had different 'starting' places. It is not reasonable to assert that a kit is not for a beginner! At one time if hams did not make their own radios from scratch (not even a kit) they had no radio at all. The uBitx is not really so much of a kit. Building your own gear from scratch or from a kit is 'learning by total immersion'. Sometimes that method can seem frustrating but eventually we all get where we want to be. Just relax and enjoy the 'journey'. After you have finally sorted out the trouble and corrected it you will find it more satisfying than that Kenwood or Yaesu:) Those have their own rewards and can be an appropriate starting place for somebody else.I started out building radios from a pile of old junk harvested from dead radios. At times it was discouraging but in the end it doesn't seem to have hurt me:)
Sorry i unterstand and this is real you say. I didn't mean to say it was bad. I even collect a lot of bulky waste myself, such as radios and other electrical appliances and then solder them together and really like to make things. And doesn't want to be a "plug socket - amateur". So I have something to apologize for with the wrong wording.

And now about your English. Your English is very usable for a non native English user. I know only a few German words and not very much about the grammar or syntax. If I was suddenly transplanted to Germany I would experience 'total immersion' and would soon be speaking, reading, and writing German. It would sometimes seem frustrating but eventually I would fit right in :) For now your English is substantially better than my German.73,Bill KU8H
ok Thank you!

On Sat, Aug 25, 2018 at 05:14 AM, Lawrence Galea wrote:
Fabian
you will always get a DC short across the antenna terminals.
If you follow the circuit from the two antenna connectors one is earth, on receive the other goes from K3 contact 12 to 14 to K1 contact 12 to 14 to L1, L2, L3, L4 of the Low Pass Filter to T2 winding one side marked number 1 through the coil marked side number 6 to earth.
On Transmit the winding of the output transformer T11 marked number 2 is earth, the other side of the winding marked number 6 goes to KT1 contact 12 to contact 16 and then through the respective Low Pass Filter depending on which band you are transmitting.
As you can see there is always continuity through the various coils and you will always get a DC short across the antenna terminals both on receiving and transmitting.
Thank you too i would say to you for your help, thanks! i did the measurement but in the switched off state and in the switched on state and measured the board for short circuits and at both times the short circuit... but i think this is then immediately explainable as you and the other 2 HAM had explained it...?

As for not receiving anything, did you connect an antenna to the transceiver?
Yeah Antenna is Dipol for 10m ans Dipol for 80m and i should say that i never have transmit, only receive..

Regards
Lawrence
Thank you very much!!

So...ok
Now I hope my answers have bring new Ideas and tips.. thank you all for new help again

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