QR code and KD8CEC Memory Manager, "Error- data file is short"
Hi,
I can't use the QRcode function with KD8CEC Memory mangaer. I get? "Error- data file is short".
Should I maybe register at hamskey? I can't however find any function or a link for that.
73 de sm0try
Ulf
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Re: Turn off WiFi on your sBitx
I have to report failure with the current attempt at eliminating the burp from the LM380. I tried putting a 2.2ohms in series with 0.1uf across the speaker as a snubber. I added a bypass on pin 1. I put a 0.1uf across the input I loaded down the input to 220 ohms. None produced any difference. It is incredible that 2.4 GHz signal of about 1 mw is getting inside an audio IC. Maybe the microwave homebrewers should use LM380 instead of expensive GaAs FETs. I will still chipping away at this interesting problem. - f
We are early adopters because of the confidence we have in you!? Looking forward to getting mine on Monday!
On Tue, Aug 2, 2022 at 10:09 PM Ashhar Farhan < farhanbox@...> wrote: It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
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Ashhar that sounds like a good solution
On Tue, Aug 2, 2022 at 2:04 PM Ashhar Farhan < farhanbox@...> wrote: I did try that, it was confusing. Should we put it on tap? The function decoder has a pushbutton that is not used.
On Wed, Aug 3, 2022, 12:08 AM Niels Jalling < niels@...> wrote: There is one knob I really miss on the sBitx, An easy accessible volume control.
Idea: Fallback for the function encoder when not not called for it could be volume control. Fallback time f.ex. 15-20 seconds.
73 de oz9ny, niels
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Re: Turn off WiFi on your sBitx
We are early adopters because of the confidence we have in you!? Looking forward to getting mine on Monday!
On Tue, Aug 2, 2022 at 10:09 PM Ashhar Farhan < farhanbox@...> wrote: It is tough and frustrating to be an "early adopter". I thank you all for taking the plunge, Respect!
The joys of mass production and finding little bitty problems. ? ?We have the same thing in drug product production and vaccine production of course.... only when you make a lot of some thing do you start to find a little bitty unexpected issues.?
We have the incredible advantage of having Ashhar right on top of everything!! ? My first Heathkit had horrible key clicks and I think I spent a year shipping it back-and-forth Benton Harbor (from earning money vacuuming the house ) before I learned enough to fix it myself. ?
Gordon ? Bob, Thats the LM380 having some kind of oscillations. I will have a fix for the quickly. The sound goes away if you turn the wifi off. Right click on the wifi icon and select Wifi off. - f On Wed, Aug 3, 2022, 2:46 AM Bob Losee KO9V < Loseeunc@...> wrote: I¡¯m having the same sounds¡ anywhere from 4 to 8 sounds then a several second pause, then starts again. ? Changing audio level makes no difference. I¡¯ve never tried transmitting¡ just listened to WWV across town from me and it is a clean stable receiver.? Tried logging in to my wifi but I still have two red X characters over the wifi symbol Bob, KO9V, Serial Number 20 On Aug 1, 2022, at 1:57 PM, Niels Jalling <niels@...> wrote:
?When I powered up my new sBitx I heard repeating noise from the loudspeaker. I knew I had seen the problem mentioned somewhere.
Found it on youtube:
Follow the description to turn off the WiFi and the noise goes away.
73 de oz9ny, niels
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Re: sBitx antenna-first warning
Thanks Ashhar for this post. I shall now use this?in my QRP station (Hermes Lite 2 with Alexloop magnetic loop antenna, which shows SWR values largely over 40:1 to the tranceiver when tuning the loop (fortunately the LDMOS power amplifier can accept SWR>65:1 but I prefer to be cautious. This tuning-indicator brings the SWR seen by the tranceiver below 2:1 when tuning the antenna, as you say in your post.
I continue to watch the development of your sBitx, wich looks like a wonder and shall decide later to buy one.
73 - Pierre - FK8IH
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Re: The Daylight Again - An All analog radio
Ken, The radio is all point-to-point soldering and large sized components. The performance will suffer it built on a single pcb.? I guess someone can try it. The radio needs improvements, it needs cw to be added, the t/r is primitive and can be bettered too. - f
On Thu, Aug 4, 2022, 9:43 AM Ken N2VIP < ken@...> wrote: What a neat little radio, thanks for sharing.
Something like that, if it could be kitted out at $50 or so would make a great club project, but kiting up such a project is way beyond my skill set.
I know you're not offering it as a kit, just dreaming - thanks again for sharing your projects! Ken, N2VIP ? I had presented an all analog radio at the FDIM this year (not the expected sBitx!).? It is a fun radio. No, this will not have kit, you are on your own.
The write up is now up on my website at?
- farhan
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Re: The Daylight Again - An All analog radio
What a neat little radio, thanks for sharing.
Something like that, if it could be kitted out at $50 or so would make a great club project, but kiting up such a project is way beyond my skill set.
I know you're not offering it as a kit, just dreaming - thanks again for sharing your projects! Ken, N2VIP
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Show quoted text
On Aug 3, 2022, at 22:56, Ashhar Farhan <farhanbox@...> wrote:
? I had presented an all analog radio at the FDIM this year (not the expected sBitx!).? It is a fun radio. No, this will not have kit, you are on your own.
The write up is now up on my website at?
- farhan
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The Daylight Again - An All analog radio
I had presented an all analog radio at the FDIM this year (not the expected sBitx!).? It is a fun radio. No, this will not have kit, you are on your own.
The write up is now up on my website at?
- farhan
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Can't go wrong with Bender -- '72
Aaron K5ATG
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WOW, Never ran that much thru rg6u quad shield. have run consistantly 150 watts thru it when i owned a QRO rig.
good for you. I buy mine thru either walmart or homedepot or menards depending on when they have a sale. i buy the twist on connections . I dont like the crimps since they are prone to sharp edges if crimped wrong and be a point of possible interference? and moisture.I also seal mine with a caulking friendly to the coax.
The 1:5 on my ubitxs are no problem either . All my rigs have rg6u quad shield from start to finish and i have rg6u jumpers with twist on connectors for testing ,etc.What i dont spend on the rg8x,i can splurge on good f to pl259 fittings,and extra cable in case i have a blowout or something else.All my feeds are buried ,run thru 1/2" pvc so if i need to replace a feedline,just tie onto it with new cable and pull.
WOW Again on the 800 watts thru it
73 David ac9xh good thru hamcall.net,qrzcq.com and FCC
On Wednesday, August 3, 2022 at 02:16:44 PM EDT, Aaron K5ATG via groups.io <k5atg@...> wrote:
"I also use the quad shield with good results up to about the 800watt level"? WOW I consider 20 watts to be high power lol -- '72
Aaron K5ATG
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Anybody have vector graphic versions of kd8cec nextion screens?
Looking to create a consistent set of nextion screens at their native resolution. ?Anybody have a set of drawings in a vector graphics form that can be resized for each platform? ?Only seen bitmapped versions that were optimized by individuals for each platform.?
73
Mark
AJ6CU
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On 8/3/2022 13:10, Aaron K5ATG via groups.io wrote: Although I might be able to put the Voyager plaque and put some clothes on the man and lady so my 19 year old son doesn't destroy it for displaying hard-core pornography (He is Autistic with Aspbergers and considers people holding hands to be hard-core porn.) I prefer the attached version. We meatbags had our chance... -- Tom Sevart N2UHC St. Paul, KS
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Re: A short video of sBitx working
You forgot the Christmas transmission. My son and I visited the site a few weeks ago. The transmitter is started several times during the year.
The signals go into a very big dummy load.
de 0z9ny, niels
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Re: sBitx antenna-first warning
Here is one of many posts from Allison that are worth reviewing, mentions the 6m 225W power amp she built using 4+4 IRF510's in push-pull. The whole thread is worth a read. ?? /g/BITX20/message/22597She has been contributing to the forum for some time now: ?? /g/BITX20/message/14514?? /g/BITX20/message/869Just plugging a new fet into the sBitx likely won't solve anything. The circuit around it should be designed specifically for that part for good performance. Jerry, KE7ER
On Wed, Aug 3, 2022 at 10:14 AM, Jerry Gaffke wrote:
The IRF510 can work dependably, Allison reports years of success with HF amps at 40W push-pull,
surviving everything from accidental open antenna connections to dead shorts.
In posts to this forum from several years ago, Allison went into plenty of detail.
She even used them on 6m at several hundred watts (with bunches of them in parallel).
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Re: sBitx antenna-first warning
and here is where bias and standby current (class A A/B C) comes
into play :-)
dg9bfc sigi
Am 03.08.2022 um 15:07 schrieb Max via
groups.io:
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Show quoted text
Please forgive my ignorance
but I've never understood statements like this.?
"That is because at lower power, the
output impedance of the PA will be different."
Since SSB is all about
audio (no audio, no power) and the average power is about
40% of peak, what happens to the output impedance every time
you speak into the microphone? Power is going to follow the
audio and would be all over the place, from zero to peak
power. How is this any different?
Max KG4PID
On Wednesday, August 3, 2022, 02:45:06 AM CDT, Ashhar
Farhan <farhanbox@...> wrote:
Many recommend tuning at a lower power. This risky as
well. That is because at lower power, the output
impedance of the PA will be different. Once you are
tuned at QRP level, increasing the power will result in
a mismatch again!?
- f
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"I also use the quad shield with good results up to about the 800watt level"? WOW I consider 20 watts to be high power lol -- '72
Aaron K5ATG
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Alan, I like the idea of the solar system but I am also rebuilding my 12-inch Dobsonian telescope with a lot of space imagery and I think my XYL may object to more space stuff in the house. Although I might be able to put the Voyager plaque and put some clothes on the man and lady so my 19 year old son doesn't destroy it for displaying hard-core pornography (He is Autistic with Aspbergers and considers people holding hands to be hard-core porn.)? Jim that is a cool idea. It made me start looking up old art deco radios. They knew how to make stuff look great back then. Many of today's rigs are as Bill Meara N2CQR would say, "It just does not have a soul"? -- '72
Aaron K5ATG
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I also use the quad shield with good results up to about the 800watt level... if everything is right (no sharp bends anywhere) it works just fine. Otherwise I have melted and spectacular flash arc through the entire cable burns through at that power level.? ?the thing with the Rg6u? is that because of the 75ohm cable, my 50ohm transmit output sees an almost exactly 1.5 : 1 swr.... which is not a problem.??
Alan? w7aln
I use an emtech zm-2 tuner and also a ldg z100 tuner. both seem to work 100%.
Im an odd ball,. I like just a little bit of swr on my antennas. 1:5 seems to get out better where i live.I also use rg6u quad shielded cable also.My ubitx loves it. doesnt have a problem.
73
David
ac9xh
good thru , and FCC
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Re: sBitx antenna-first warning
Got it.? I thought it might be something like that.? I have a QRPGuys Tuning Indicator that that I was using with my uBitx v6 transceiver.? It looks like the same circuit.? I'll replace the single 5.1 ohm resistors with the parallel group you suggest.? Cool, more stuff to build!
(We need help.)?
Scott
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Re: sBitx antenna-first warning
Jack, How much voltage were you running on the drains? - f
We've tested the T41 with its 510s to 40W and nothing fried. 80-40-20M all can deliver about 25W without much effort. 15M is about 20W and 10M drops to about 13W. Like I said, it is what it is...
Jack, W8TEE
On Wednesday, August 3, 2022 at 01:14:06 PM EDT, Jerry Gaffke via <jgaffke= [email protected]> wrote:
The IRF510 can work dependably, Allison reports years of success with HF amps at 40W push-pull, surviving everything from accidental open antenna connections to dead shorts. In posts to this forum from several years ago, Allison went into plenty of detail. She even used them on 6m at several hundred watts (with bunches of them in parallel). The QSX amp from qrp-labs uses IRF510's in push-pull, does a consistent 10W from 3 to 30mhz. ? Clean and linear even when operating from 12v, tolerates any antenna condition. A product of collaboration between Hans and Allison.? ?Cost of $26 USD for the kit, a steal. If I were building a rig like the sBitx from scratch, I would start with that amp for a PA, perhaps add PIN diode TR switching with the HV supplied by rectified RF. HFsignals could steal that PA design for the sBitx-v2, give Hans $5 for every unit if feeling guilty. Using the IRF510 for RF power amps takes careful design.? Especially heat sinking, as the IRF510 is not very good at getting heat from the die to the TO220 tab.? The IRF510 prefers more like 24vdc for higher power and reduced distortion. Improper design can blow the gate due to exceeding Vgs max spec momentarily Needs more drive than an RD16HHF1 to get similar power levels due to moderately high gate capacitance. However, Vds max is much higher for the IRF510 than it is for the RD16HHF1, so for cases of high Vds the IRF510 would survive a high SWR better than the RD16HHF1. Allison was of the opinion that moving to the RD16HHF1 on the uBitx would not help much. Reading from?? "The power amplifier of Figure 6 is a conventional power chain, probably a little sub-optimal. Two stages of pre-driver amplification with metal 2N2222As boost the signal level from -15 dBm to a little above 100 mW" For "sub-optimal" we could substitute "inexpensive".? One necessary change if wanting somewhat even power output all the way up to 30mhz would be an additional stage of amplification.? Gong from -15 dBm to +20 dBm (100mW) in two stages of 2N2222's is 35 dB of gain, or 17.5 dB per stage.? That's pushing it,? Though as we saw on the uBitx, optimizing a power amp is complicated, especially when doing it for a low budget product.? If NFET's seem too hard to use and just too dang complicated, an 807 or 6146 should do fine with any SWR when operating at 40W.? ?;-) Names could be shorter 80 years ago, they didn't have 10 gazillion different electronic parts to keep track of. Jerry, KE7ER On Wed, Aug 3, 2022 at 09:29 AM, Ashhar Farhan wrote:
The RD16HHF1s are no longer in production. There are some really good parts from Nexperia. They have no easy names like 807 or 6146. They have names like AFT05MP70. Why have short names when you can make up names that can't fit on the package?
- f
--
Jack, W8TEE
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Aaron K5ATG
