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Re: RD16HHF1 power curve flattening...some
Hi everyone,
I tried to do this mod:? I checked everything for shorts, and a multimeter connected to the power input shows typical capacitor behaviour. However, when I connect power, my 3A fuse instantly pops. Is it possible that fake RD16HHF1 are causing this? I'm kinda desperate. |
No Audio
#ubitx
Received what I believe is Version 1 of mBITX in January 2018. Built unit and it worked fine until the TDA2822 audio amp smoked and burned. Replaced TDA2822 and know that it is inserted and soldered properly into the board. Now there is no audio. What happened? In soldering the audio amp in place did I somehow damage adjacent circuitry?
Richard Sweitzer - KK4BLF |
Re: Ubitx version 4.3
Dave Dixon
Hello Paul, ?????????????????? you need to download KD8CEC SOFTWARE and then transfer it to your 4.3 ubitx I had similar problems but all were resolved with the sioftware,,I use Richard G3 CWI dsp W/N cw filter works great now plus now got Touch colour screen and makes the radio so easy to use in fact a doddle.again youl need to download the software and transfer it to your radio,all info is available on KD8 CEC SITE.Dave G0AYD. On 17 July 2018 at 14:53, p.gould1@... <p.gould1@...> wrote: Many thanks for that Jerry! Live and learn, yes solely cw, so filters will be the way to go. SSB for me would be a bonus that I probably wouldn't use ! The main source of irritation for me is the very low rx volume and of course keying. I wasn't aware that the firmware was available for the version 4 ubitx so will try and work out how to use that, very hard for an old dog to learn new tricks (hi) many thanks for the heads up, it's really appreciated. 73 to you.... Paul M6FEU |
Re: 3.2in Nextion display now looks great.
Looks very nice Malcolm, I bought one of the 3.2E inch Nextion displays also, but I don't want to modify my already existing uBitx because it's all laid out for the 16X02 display and it looks good. I guess I'm going to have to buy another uBitx and another case. Oh well, I have to do what I have to do:-) Meanwhile this display is making me anxious to use it. I loaded the firmware into it and it works great.
Joel N6ALT |
Re: Windows Serial Port Problem
Jim Lommel
I would guess that the install went badly.? I think that there is a program called Windows Update manager that you should look at and see ifit will allow you to uninstall the update.? I also think that there is a setting in th Update Manager that you can set to not automatically install updates. 73, Jim WD8RWI On Sat, Jul 14, 2018 at 5:09 PM, Albert Woodhull <n1aw@...> wrote: A few days ago my Windows 10 installation got updated, without asking me, of course.? I stepped away from the computer for a while and when |
Re: Mike element
Tnx Jerry for this valuable explanation in plain English. I learnt a lot from it. Hope this topic could become a question in the FCC exam if not included yet (I don't remember I have ever seen it). Il 17/lug/2018 15:19, "Jerry Gaffke via Groups.Io" <jgaffke=[email protected]> ha scritto: The receiver spec's how big of a signal goes in to give a desired result. |
Re: Ubitx version 4.3
Many thanks for that Jerry! Live and learn, yes solely cw, so filters will be the way to go. SSB for me would be a bonus that I probably wouldn't use ! The main source of irritation for me is the very low rx volume and of course keying. I wasn't aware that the firmware was available for the version 4 ubitx so will try and work out how to use that, very hard for an old dog to learn new tricks (hi) many thanks for the heads up, it's really appreciated. 73 to you.... Paul M6FEU
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Re: Question about Nextion display and firmware
hirosmb
¿ªÔÆÌåÓýGuys,Sorry if I ask a silly question. Do I have to switch Arduino nano to mega2560 if I use the Nextion display? If it¡¯s not the case, what is your incentive to switch them?, I¡¯m just curious. Thanx, // hiro, JJ1FXF?
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Re: Mike element
The receiver spec's how big of a signal goes in to give a desired result.
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The microphone spec's how big of a signal goes out given a specific input sound level. So the first gets a smaller number if more sensitive, the second increases if it's more sensitive. Totally different industries, totally different notions of how to go about it. A receiver's sensitivity figure in dBm tells us how much power must be coming in the antenna port to achieve a specific result, in this case the "minimum discernible signal". A power level zero dBm is arbitrarily defined as 1 milliwatt, and since typical signals at the receiver are much lower in power, the receiver sensitivity is a fairly large negative number. The microphone's sensitivity is defined as how big of a voltage signal we get coming out when the microphone is presented with a sound pressure of one Pascal, and zero dBV is arbitrarily defined as one Volt.?? Most of the speakers I buy state something like: "Response from 20 Hz to 20 kHz". Not very precise. They don't actually say what the response is, could be argued that catching fire is a response of some sort. Here's a webpage on speaker sensitivity: ? ?? "Sensitivity Sensitivity is most easily defined as the speakers¡¯ ability to effectively convert power into sound. The traditional way of measuring a speakers¡¯ sensitivity is using the standard of 1 watt/1 meter. Meaning a microphone is placed 1 meter away from the speaker to measure the sound output (in decibels) with 1 watt of sound played through it.?" So like the microphone, they spec how big of a signal goes out (sound in dB) when given a specific input (1 watt of electrical power). Makes sense, as would have been the same engineers working with microphones and speakers back when these things were defined. Next question:? What is 0 dB of sound, and shouldn't that dB have a letter following it to tell us what the baseline is when finding that ratio? Answer:? Zero dB of sound?is defined as the minimum discernible signal for the typical human ear. No final letter because, well, it's a different group of engineers who defined it and they didn't care about the resulting confusion. Jerry? On Mon, Jul 16, 2018 at 11:50 PM, iz oos wrote:
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Re: Nextion display cutout and mounting.
#ubitx
#ubitx-help
Stephanus K6NG
Awesome bezels from this site,
Very professional looking.? Stephanus |
Re: New file uploaded to [email protected]
Michel, thanks for sharing this.? I will check this out and make changes.
Have you seen any other problems that should be addressed. Thanks again for sharing this issue. kn4ud -- Allen ?Merrell |
Re: ADE-1-24
Theoretically the mixer (transformers, diodes) should be balanced and whether you ground pin 2 or pin 5 makes no difference, especially within the specified working range (0.5-500MHz). However, realistically you might get different LO leakage on the RF and IF ports, but that is over -50dBc on both ports at HF so not really something to worry about. Look at the Isolation L-R and Isolation L-I in the ADE1 datasheet, the values are slightly different:
Cheers, Razvan. |
Re: uBitx Version 3 and my homebrewed enclosure complete - Well Almost!!
#ubitx
Hello all ? ? ? ? ? ? ? ? ? ? ? ?Fine job Juddie, congratulations! 73 Saulo PY7EG 2018-07-15 14:40 GMT-03:00 WD8WV <juddie.d.burgess@...>: Well, when I first posted about my uBitx being done, I made a mistake and in the title I typed QCX!? DUH!!!? Well, here I am again with my completed uBitx (not QCX).? I only have a few mods left to do, but right now I am having all kinds of issues trying to get the KD8CEC S-Meter modification done using the LM358 chip.? But I have that mod left to do, the TX/RX pop mod and the AGC mod by ND6T (I think that is right) to do.? I have already did the mod and added an RF gain control with a 1K potentiometer.? I created my own bezel for the front of my homebrewed enclosure. I also added a USB male to female adapter so I don't have to remove the cover to update the firmware.? Still need to get the SD card ribbon cable extender to plug into the Nextion display so I won't have to remove the display to update the tft files on the display. |
Re: Question about Nextion display and firmware
¿ªÔÆÌåÓýHello Mike and Bo, ? Thank¡¯s for your responds, I agree with Mike, I need the sketch sources, for some modifications. eg: pins assignations, specifics functions for myself and other choices. I can redevelop a new firmware, but the CEC firmware is very pleasant and I appreciate this very well. Jan have make a fantastic job and why to reinvent the wheel ? 73¡¯s de Jacques ¨C F1APY ? From: [email protected] [mailto:[email protected]] On Behalf Of Mike Woods
Sent: Tuesday, July 17, 2018 10:05 AM To: [email protected] Subject: Re: [BITX20] Question about Nextion display and firmware ? Then it will definitely need some changes to the sketch!?? The i2c pins are different for a start.? I'm not sure what else would need modifying.
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