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Re: uBix - transmit clicking when Mic inserted
Do you have the keyer jack wired up?? If not do you have a 4.7k resistor between pins 2 and 3 of the radiuno?
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Re: uBix - transmit clicking when Mic inserted
Listen to see if the xmit relay is cycling. Take a paper towel tube and place it over each relay to determine if one is cycling. If so, look on the schematic to see what that relay controls.? If it's tied to the PTT circuit, the mic is probably wired incorrectly.
Jack, W8TEE
On Sunday, January 13, 2019, 10:21:41 AM EST, Jim Miller <stljim@...> wrote:
Hello everyone,
I've sent several messages in the past asking about why my uBitx clicks (relay) as if it's trying to transmit when I connect a mic to the jack.? I've even sent some images of how I have it wired up and as best as I can tell I have it wired up correctly (search for previous posts).? I've also tried using the little button mic that comes with the kit and have the same issue.??
At this point, I don't know what else to do so I'm going to ask if there's an Elmer out there who'd be willing to be a 2nd pair of eyes and confirm that either there's an issue or I'm an idiot (the latter is more likely).? I'd be glad to pay shipping back and fourth (I'm in St.Louis, MO).
Thank you, Jim Miller AE0BZ
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Re: uBix - transmit clicking when Mic inserted
That is what happens to all three of my ubitx radios. The work around that I have used is to not plug in mic when turned on.
Welcome from N.E. Mo.
73
Dave
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Re: uBix - transmit clicking when Mic inserted
Jim,
If the mic connector is common with PTT then I suggest you try switching the PTT and mic contacts.
Raj
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At 13-01-19, you wrote: Hello everyone,
I've sent several messages in the past asking about why my uBitx clicks (relay) as if it's trying to transmit when I connect a mic to the jack.? I've even sent some images of how I have it wired up and as best as I can tell I have it wired up correctly (search for previous posts).? I've also tried using the little button mic that comes with the kit and have the same issue.? ?
At this point, I don't know what else to do so I'm going to ask if there's an Elmer out there who'd be willing to be a 2nd pair of eyes and confirm that either there's an issue or I'm an idiot (the latter is more likely).? I'd be glad to pay shipping back and fourth (I'm in St.Louis, MO).
Thank you,
Jim Miller
AE0BZ
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uBix - transmit clicking when Mic inserted
Hello everyone,
I've sent several messages in the past asking about why my uBitx clicks (relay) as if it's trying to transmit when I connect a mic to the jack.? I've even sent some images of how I have it wired up and as best as I can tell I have it wired up correctly (search for previous posts).? I've also tried using the little button mic that comes with the kit and have the same issue.??
At this point, I don't know what else to do so I'm going to ask if there's an Elmer out there who'd be willing to be a 2nd pair of eyes and confirm that either there's an issue or I'm an idiot (the latter is more likely).? I'd be glad to pay shipping back and fourth (I'm in St.Louis, MO).
Thank you, Jim Miller AE0BZ
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Re: Mini PA für my uBITX
#ubitx
The heat dissipation on 24V really is high - i stick to 13.8V and 30W on the meter.
The PA is still to be analyzed regarding spurs - this is going to be done in the near future.
?
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Re: uBitX v4.3 calibration
I was baffled by this too. All a bit strange.
For uBitx V 4.3 calibration Here's what i did:
Change band to 20m, attach a dummyload, or a decent antenna for 20m, with a low SWR. Use Your frequency counter, then start the calibration routine - the radio will key up , then adjust so Your frequency counter reads bang on 20mhz.
After You do this, Things will be fall into place i suspect, including the BFO problems i bet You are having.
Yes, i know. This sounds wrong, but i could NOT get my uBitx to behave predictably until i did this. I actually thought i had fried it it was so unstable and off-frequency, then i did the calibration thing, but with the radio on 20m, and it all fell into place.
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With the Raduino otherwise disconnected, can you plug its USB port into a USB line from your computer or a cell charger? That will power it up on 5v and you can see if it is displaying and acting normally to see if it has any issues from being misswired.
=Vic=
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Re: uBitX v4.3 calibration
Playing more with the uBitX, currently “breadborded” (wired up with alligator clip jumpers) on the desk. I found that it is going into transmit during the calibration phase, and that appears to be intentional. In other modes the PTT switch acts normally. I tuned my main rig to 10mHz and, watching the pan adaptor screen, I moved the apparent uBitX carrier up to zero beat the frequency, alternating listening on USB and LSB, and now it seems right on frequency. Then I played a little with the BFO and it is sounding better. They really should change the instructions on the website as I have never heard that this is the way it is supposed to be done and that seems odd for a new or impoverished ham who would not likely have another rig with SSB capability to listen to.
I plan to play around in this temporary hookup and probably load the CEC sketch and see about converting the display. Then the big question of whether I start modifying the rig for spurs and harmonics or wait for the v.5 board.
=Vic=
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Re: Mini PA für my uBITX
#ubitx
A consideration here is to wonder if any spurs, etc., get
amplified with the amp. May need more LPF's to keep it
within FCC specifications. Just a thought.
Bob — KK5R
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On Sun, 1/13/19, DC3MS <mark.schraven@...> wrote: Subject: Re: [BITX20] Mini PA für my uBITX #ubitx To: [email protected] Date: Sunday, January 13, 2019, 2:58 AM Right, the module seems to be sold by many different sellers in asia. Dont expect to get documentation or service, they just sell it. The boards are named "XF-P100" and "XF-LPF-HF". ? I am not promoting these modules as the amp can be changed to whatever you like, i just wanted to control it via i2c using Arduino. @Timothy : I have tried to run in on 24V and my Zetagi HP500 showed? 90W output with 5W drive. Given the MRF186s specs, wheres the catch ?
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Re: Mini PA für my uBITX
#ubitx
Got more options with an eBay search...
Bob — KK5R
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On Sun, 1/13/19, Timothy Fidler <engstr@...> wrote: Subject: Re: [BITX20] Mini PA für my uBITX #ubitx To: [email protected] Date: Sunday, January 13, 2019, 12:56 AM this vendor is top-cc* in Shanghai - never used him? - this is simply answering the question. There is probably only one mafr down in a tin shack somewhere in PRC and these legions of resellers.? He quotes it as? 90 w Module which is bollocks.? NB no LPF with this incarnation. some other vendors of the same basic? PCB have an LPF but it is the single relay for both in and out type - as per what the MX-P50 uses.
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Re: Mini PA für my uBITX
#ubitx
Reply : Some of the photos I have seen have marginal looking? OPTs on them as in things that look like longitudinally split core coaxial cores.
2.? THe fully assembled versions will have a heat sink based on something like 30 W dissip most likely.? When you look at the MRF 186 specs it is rather in efficient so?
heat,? when it is run at 90 W out continuously could be a real problem.? A modern mosfet RF Amp will be nominally 60 percent eff in class B but NOT this one.
3. Some of the units have a power supply capacitor that is marginal at 24 V supply. - It can be changed out - in fact the Ozzie Wordpress article may have mentioned that.
apart from that , no issues !? PS it would be fascinating to find out how so many of these VHF gemini pairs got left in a sack in PRC prior? to their being repurposed for current use? - I guess they were intended for some military project that was canned or a better device (higher efficiency) was found and these ones went begging.??
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Re: Mini PA für my uBITX
#ubitx
Thank you Timothy.
Heres a link : https://www.ebay.com/itm/Assembled-LPF-low-pass-filter-90W-SSB-CW-AM-RF-HF-power-amplifier-HAM-RADIO/121965988356?hash=item1c65bd4a04:g:2kgAAOSwFxBXHHYO:rk:3:pf:0
?
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Re: Mini PA für my uBITX
#ubitx
Right, the module seems to be sold by many different sellers in asia. Dont expect to get documentation or service, they just sell it.
The boards are named "XF-P100" and "XF-LPF-HF". ?
I am not promoting these modules as the amp can be changed to whatever you like, i just wanted to control it via i2c using Arduino.
@Timothy : I have tried to run in on 24V and my Zetagi HP500 showed? 90W output with 5W drive. Given the MRF186s specs, wheres the catch ?
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Ted,
Just uploaded into files section RC RX/TX voltages without modulation. See files \ VU2ZAP folder.
Power supply adjusted to 12.0V during RX and TX.
Hope it helps!
Cheers
Raj
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Hello,
This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected]
group.
File: uBitx4 voltages.xlsx
Uploaded By:
Rajendra Kumar G G
Description:
DC voltages TX/RX uBitxv4
You can access this file at the URL:
/g/BITX20/files/VU2ZAP/uBitx4%20voltages.xlsx
Cheers,
The 开云体育 Team
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Re: Mini PA für my uBITX
#ubitx
this vendor is top-cc* in Shanghai - never used him? - this is simply answering the question.
There is probably only one mafr down in a tin shack somewhere in PRC and these legions of resellers.? He quotes it as? 90 w Module which is bollocks.?
NB no LPF with this incarnation. some other vendors of the same basic? PCB have an LPF but it is the single relay for both in and out type - as per what the MX-P50 uses.
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Re: Tracing receive signal for low signalou've
If you've got it working to your satisfaction, thats probably a good place to stop ..
Jim
On Saturday, January 12, 2019, 9:43:00 PM PST, Dave Space <davesspacebar@...> wrote:
Actually I think with the pre-amp I might have had a loose connection and had to adjust the gain.
It seems a lot better now.? I actually got around 130mv p-p at vol high with 100uV into the antenna.? I might have been getting inconsistent readings due to the breadboard loose connections or something.
Also often I would do some initial on air tests with a ham stick before switching over to my full 40m dipole.
I need to do more testing but the on air tests sound really good with this pre-amp in place now and connections good.
I might need to actually dead bug the pre-amp onto an actual board to keep the connections from being loose.
(at the moment I'm listening to a s7-s9 signal over the earbuds and I'm not wearing them they are on the other side of the room :) )
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_Dave_ AD0B
Raj vu2zap
Vic WA4THR
Bob Lunsford