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Re: ubitx receive signal
Ah you are right I do see that short to ground through the inductor.? ? I can receive signals but they are so low they are almost unintelligible and hard to sound centered on.? Tried the BFO but its as good as it gets on the default.? I tried some different earphones but still no luck? signal either can't be heard or if it can be it's hard to hear.
Tried hooking up a speaker but don't hear anything out of it (have to check if it's hooked up right or drive.)? It sounds to be like there is not enough RF gain perhaps though the noise level is already pretty high so no sure if more gain would make it easier to hear. I've listened to some folks with their ubitx on youtube and they can send crystal clear and loud enough but mine doesn't seem to have those qualities.? Mostly hard to pick up anything, even on the strongest remote signals not very clear.? Trying with a close radio at 5 watts its a lot louder as expected and clearer but still pretty muddy but intelligible. |
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Re: Determining version/revision number of board
Hi,
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Mine has something about Version 3 silkscreened in one corner of the board. Easy peasy for me. 73, Bill KU8H On 12/15/18 2:30 PM, John wrote:
How does one determine the version number of the uBitx hardware? I see the SW version flash by on the screen during powerup. --
bark less - wag more |
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Re: ubitx receive signal
Hi Dave,
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Check the schematics. The antenna terminal has a DC short to ground through an inductor. I have not looked at the other items you listed there but I would not be surprised to find the windings of an inductor across those too. Those relay terminals wouldn't happen to be the relay coils would they? If not, then look where they connect forother inductors or small resistors. If you were able to receive signals at all then your antenna terminal and others are not shorted to grouns (for rf). 73, Bill KU8H On 12/15/18 2:28 PM, Dave Space wrote:
I just got the ubitx and wired it up. --
bark less - wag more |
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Re: ubitx receive signal
Thanks giving it a try.? Tuning around can't really get a decent signal on 40 meter or 20 meter.? I tried using a full half wave fan dipole on 40m/20m.? ?Testing at 5 watts from my nearby radio it's ubitx gets a strong? signal its intelligible but very muddy.
Weak signals are all pretty weak and hard to copy.? I'll try a bit more and maybe give the BFO a try. Thanks. |
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Re: ubitx receive signal
Dave
Listen to a few more signals. Ubitx has no AGC. Weak signals require cranking the volume up. Also a good antenna will beat a piece of short wire. Try headphones and several signals. Its a nice receiver, just different than commercial norm. Its possible bfo might need adjustment, mine did. But get some more data. Curt |
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Re: Determining version/revision number of board
the pcb with discrete audio amplifier is Ver.4 and the one with TDA2822 is ver:3 On Sun, Dec 16, 2018 at 1:00 AM John <johnk5mo@...> wrote: How does one determine the version number of the uBitx hardware? I see the SW version flash by on the screen during powerup. |
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ubitx receive signal
I just got the ubitx and wired it up.
I was able to use a signal generator to hear a signal on 7.150MHZ that sounded good.? But listening to a station that sounded good on my regular radio I could hear it clearly but ubitx on the same antenna it was a bit weaker signal and hard to understand. I noticed it use about 150ma just powering up for the smoke test which isn't within the documented limits. I noticed base of Q12 has more than the documented voltage at a little over 10 volts which is above what is expected. The two antenna pins I noticed only have about 1.8 ohm resistance not sure if that is normal, continuity tests show that as basically shorted to ground. I noticed the K3 relay seems different than the other relays pin 9 seems shorted to pin 5.? (K3 Pin 9 Seems like the only pin of all the relays that is grounded) K3 pins 5 and 3 seem shorted as you would expect. I noticed all of the other relays: 12 and 5 shorted, 14 and 3 shorted and 16 and 1 show shorted but on K3 12 and 5, 14 and 3 and 16 and 1 aren't showing as connected? (they show about 10k resistance except for 16 and 1 that don't show connected at all. Is there a K3 relay issue here perhaps or is that normal for that relay? Any other ideas for receive strength improvement/checks? Thanks. |
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Re: Version 4 bitx squealing after nextion upgrade.
I am told, Evan, that the blink.ino can cut short the original program even if present there. so? people feel that the? arduino and its saved eeprom memory values are erased. ?. I would suggest as advised by a sr programmer friend, to use the given ino in my earlier message ?. ?If you are habituated to compile and program? , please do it . This wouldd clear all the fixed values like frequencies , etc, Later you can load the stack firmware as given by farhan. regards sarma vu3zmv On Sat, Dec 15, 2018 at 9:17 PM Evan Hand <elhandjr@...> wrote:
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Re: Version 4 bitx squealing after nextion upgrade.
uniflite58
11:02am ? #62533??
,Please try to vacate the eeprom contents using some ino and then load stock version and let us see . |
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Re: Version 4 bitx squealing after nextion upgrade.
Uniflite58,
The resistor is needed even if you do not plan on CW.? The uBitx can get into CW transmit mode without the resistor.? Per the instruction from HF Signals be sure to install the 4.7k resistor between the blue and green wires from the Raduino board (NOT the main circuit board).? Insulate it and then try again. It still may be toast, but you need the resistor connected. Here is the link to the wire up instructions: 73 Evan AC9TU |
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Re: Version 4 bitx squealing after nextion upgrade.
Thanks Evan,? The lcd is and was at full brightness. I did not have the cw resistor in place as I didn't plan on using that mode.. Right after that is when the problem started.? I reverted back to the stock hex file and re-installed the 2 line display and the problem persists. I think it's cooked. |
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