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Re: KD8CEC - Nextion Display - IAN questions
Ian,
First, thank you for the time and effort you have put into this radio and now, a truly nice display to go with it. ? I'm new to Arduino but your tutorials and instruction allowed me to upload .hex files to the Arduino and the Nextion display. ?Everything works (V1.094) that I've tried so far.? I started using Raspberry Pi's for all my radio interfacing and digital mode operation some time ago so I could learn that little Linux board. ?They were also used for all the firmware upgrades for the uBITX and the Nextion display. When something didn't go exactly right the first time, I knew it was something I did. Because your software and procedures are top notch. You sir are doing a great service to this user community and our hobby. Lowell Haney Rome,GA |
Here is the Google Translate URL for the article.
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Hello Remi,
I measure 168 ma. for my entire uBITX on idle receive (low volume, no input signal, 13.8 volt source). Since I use a 7808 as a pre-regulator my 7805 is cool enough to pinch and hold, the additional heat being soaked up by the cabinet where I mounted the 7808. That keeps heat off of the Raduino and also provides a modicum of additional filtering. I also decrease the LED backlighting on my display which probably helps a bit. Isolate the loads and check your current. There is something wrong if you measure 350 ma at under 14 volts. With the power off, unplug the Raduino, re-apply power and measure the current. If the drain is coming from the Raduino then disconnect power again and just unplug the display. Then apply power and measure again. Take your time and measure resistances until you see something amiss. Check to see if something is touching mechanically where it should not. Check under the boards. Look for a tiny wire or solder ball. Make sure that you are, indeed, in receive mode. Please let us know what you found. 73, Don |
Re: WD8CEC frequency display FT8
Not exactly sure the issue you are describing.
However, I see your display is moving in increments of 500Hz.? When I was first trying to get WSJT-X working and the frequency calibrated, I was very puzzled. That is until I discovered that the CEC firmware would only set the frequency via the CAT interface in the same increments as the rotary encoder frequency steps. I had to set the frequency steps for the tuning knob to 10Hz to get my WSPR frequencies to set correctly and then use the PPM setting in WSJT-X to dial in the final frequency adjustment. Tom, wb6b |
Re: Heat sink
R. E. Klaus
I am going to bend up a case from Brass sheet and I plan to use the case for the heat sink. I will have to use insulators to electrically isolate the finals. It should give me a much bigger surface area to dissipate the heat,? and also shield the uBitx from external fields.
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Re: Understanding Spurious Emissions
I have a receiver here with a first IF of 45 MHz and coverage very slightly more than the ubitx. It has eight filters and very few (maybe none) birdies. In a receiver birdies are a local problem and no problem to the outside world. But still an obvious problem. That is not a suggestion that you must use eight filters instead of four but to serve as a referencence point for future development and for those who want to modify their radios.
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For what it's worth, I intend to not modify mine much at all. I will run the modest power on the upper bands (where I almost never venture). The 'CEC' software looks attractive. I will install a level control on that roaring loud sidetone. I will put the insulated mounting kits on larger heatsinks (probably my steel cabinet). And operate, operate, operate :) It is Field Day weekend here in the USA and I will be giving my uBitx a baptism. 73, Bill KU8H On 06/23/2018 01:38 AM, Ashhar Farhan wrote:
Hmm... --
bark less - wag more |
Re: Heat sink
Hi Walt,
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Others here have reported doing what you propose and had no ill effects. I intend to eventually do the same thing. 73, Bill KU8H On 06/23/2018 12:17 AM, VE7CWS WRSeiler wrote:
Hello fellow constructors --
bark less - wag more |
Re: Heat sink
VE7CWS WRSeiler
Thanks Folks, I will go ahead with my plans then, so far so good!!,
I am having a great time, can¡¯t remember so much fun since I built a Heathkit television in my senior year in high school, guess im dating myself Hi Hi! You should have seen my mom¡¯s face whe I plugged that in and no smoke came out.? Cheers and 73 Walt VE7CWS |
Re: W8TEE Power/SWR Sketch for Nano
Jack Purdum
I don't have anything that's driven by the AD8307, only the AD9850. However, the OLED doesn't care since it uses pins A4 (SDA) and A5 (CLK) for the clock and data lines for I2C interfacing. The data feed to the Nano is thru A1 using a voltage divider so we never exceed 5V on the pin. I, too, used the "two color" OLED, but treated them as separate objects, so the output looks like: As you can see, the top line is in yellow. I made the power figure in a larger font, since that's the info we were interested in. Truth be told, even though we calibrated the output, anything after the decimal point is pretty much a guess. For its rated power level (i.e., 150W) however, I think we're below a 5% error, which is good enough in most cases. To me, it's real feature is that it provides a polite way to tune a rig without splattering everyone else on the band. Jack, W8TEE
On Saturday, June 23, 2018, 5:50:08 AM EDT, Henning Weddig via Groups.Io <hweddig@...> wrote:
Kees, after having some trouble I got the sketch from? Duwayne? (KV4qb
blogspot) to play, even with a 0.96?? and 1.3?? I2C display. See Really nice but for my "old eyes" a bit soo small. DK5LV Am 22.06.2018 um 18:52 schrieb Kees T:
Jack, |
Hi, -Sis5351A : 22-45mA (datasheet) -FT232 (part of the nano which produce 3.3V for Sis5351A from 5V) : 15mA (i assume + 3.3V consumption) -> 60mA - so that would mean that the nano board asks at least (assuming max consumption for other parts...) 350-65-45-60 = 180mA, looks a lot, near the PIC max rating (200mA) My questions : |
Re: Heat sink
I have my power output transistors on a large heatsink with isolators for each. Been using them for several months with digital and voice modes. Works well with no detectable issues. Joe VE1BWV On Sat, Jun 23, 2018, 1:25 AM Jerry Gaffke via Groups.Io <jgaffke=[email protected]> wrote: I believe that should work fine. |
WD8CEC frequency display FT8
I have had the fine WD8CEC firmware on my ubitx for about a month, am running the 1.8 version.
Today I just started noticing that the carrier frequency display tracks roughly the modulation frequency on FT8 On 20m FT8, if it is at less than 1000 hz it will drop to 14,0730. 1000-1500hz it goes to 14,07350. 1500-2000 it shows 14,0740 2000-2500 140745 My radio picks up and communicates well with other hams on FT8. 8700 miles is the longest contact. I was doing some testing on the ft8 frequency with the modulation turned down to -40db and someone caught my cq.? |
Re: W8TEE Power/SWR Sketch for Nano
¿ªÔÆÌåÓýKees, after having some trouble I got the sketch from? Duwayne? (KV4qb
blogspot) to play, even with a 0.96?? and 1.3?? I2C display. See Really nice but for my "old eyes" a bit soo small. DK5LV Am 22.06.2018 um 18:52 schrieb Kees T:
Jack, |
Re: Rx Radio
#ubitx-help
The frequency response of the second IF filters of the Ubitx vary from unit to unit depending also where the BFO is set. My unit for example is about 2khz wide filtering out frequencies below 700hz. This it is very good for speech either ssb or AM/CW. In general the less selective/worse the receiver is the better and the less fatiguing is the listening to AM broadcasts. For AM those large ugly portables with HF shine. The Ubitx sounds more a communication or military receiver, at least my unit. In general a 6khz wide filter allow just 3khz frequency response, which is not much more than the usual Ubitx. If the receiver has a passband offset control (PBT) you can possibly recover all the 6khz. In any case most large portable that have no PBT, the filter is so wide you have a more pleasant audio. To have that wide filters in the Ubitx maybe one could remove most of the crystals in the second IF. Il 23/giu/2018 00:09, "Ralph Mowery" <rmowery42@...> ha scritto:
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Re: Understanding Spurious Emissions
Hmm... It may be improper level of LO injection. On the transmit side, the mixer has _very_ strong input termination and LO termination. It will be interesting to study this. Mixers can provide endless amount of fascination or frustration depending on which side of the RF probe you are. - f On Sat, Jun 23, 2018 at 9:52 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: The four transmit filters we have are all low pass filters. |
Re: Blown (socketed) TDA2822?
Would be interesting to pop the lids off the various TDA2822 parts,
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examine the die under a microscope. I'm betting the WX looks significantly different than an ST. On Fri, Jun 22, 2018 at 10:30 pm, Jerry Gaffke wrote: But I'm just guessing. |
Re: Blown (socketed) TDA2822?
You think the WX might be a repackaged TA2822D meant for the SOIC8?
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I doubt it. I think the WX is a cheap copy that simply doesn't meet the 15v absolute max spec We had reports that there are clones of the TDA2822 (not necessarily the WX)? that blow when given a supply over 7 or 8 volts.? (Some club project in England) Didn't have to be putting out significant power to blow. As I recall, some of the WX failures happened instantly, and all struck me as consistent with too much voltage for it to handle. The SOIC datasheet you point to has the same 15v absolute max spec that the DIP part does. The primary differences I see between the SOIC and DIP datasheets from ST have to do with power dissipation, possible that ST was using the same die in both but the SOIC simply can't deal with the heat. Failure mode on the SOIC would be due to?overheating under load and take a bit of time. I don't think that is what we were seeing with the WX. ? But I'm just guessing. Could be proven wrong. Jerry On Fri, Jun 22, 2018 at 09:59 pm, Raj vu2zap wrote:
You missed my point Jerry. I am not suggesting 2822D. Please see |
Re: Blown (socketed) TDA2822?
You missed my point Jerry. I am not suggesting 2822D. Please see
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the spec sheet I attached. It is a lower power version of tda2822. I think that die is being repackaged as TDA2822 in 8 pin DIP. It cannot take the load and blows up. Raj At 22/06/2018, you wrote: Summary:? All is well, unless you have a WX branded TDA2822. |