Re: Nextion Display: Source ???
I have bought this from ebay and working ok with my ubitx ver.3.
Regards? 73 Ricky? ( DV3RWR)
On Sat, Dec 1, 2018 at 2:59 PM Snowist < uyelik@...> wrote: I trust Worldchips store in Ali???but they have 2.4 and 2.8 inch LCDs, removed 3.5 and higher from list.
Alternatively Aihasd store is available with higher sales numbers??but I didn't buy from there yet. Make sure and ask seller to send Nextion branded, you know there is Chinese brand of this, I don't suggest that one. You can get basic version, works fine.
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Quick digital mode question
Hi all,?
i am about to connect my Raspberry Pi via a usb souncdard to the uBitx.
in relation to the mic out from the rig to the sound card - does the dc voltage present on the tip of the plug (for the electret mike) pose a problem? I am confused as to whether or not I should add a capacitor in line to block the dc? Should I, and would that even work?
thanks.
Daimon. G4USI.
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Re: RF power chain mods and improvements..
Andy,
Don't grind weller bits as they are copper coated with iron (I think).
Copper tips wear out quickly as the
solder dissolves copper.
Raj
At 01/12/2018, you wrote:
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Hi Tim,
?? That's an interesting sounding tip - thank you.? I'm
fairly new to SMD and have just used the thin pencil tip on my Weller
iron.? It's worked OK so far but there's likely plenty of room for
improvement. I'll see if I can get my hands on some different tips
(or sacrifice one to the Dremel deities) and see how it feels.?
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Re: RF power chain mods and improvements..
Hi Tim,
? ?That's an interesting sounding tip - thank you.? I'm fairly new to SMD and have just used the thin pencil tip on my Weller iron.? It's worked OK so far but there's likely plenty of room for improvement.? I'll see if I can get my hands on some different tips (or sacrifice one to the Dremel deities) and see how it feels.??
? ?I use regular 60/40 solder and settled on 600-650 because I've been able to make joints quickly and not heat parts.? After a less than stellar 'success' rate soldering SI5351 chips last week, I'm beginning to wonder if I should get solder paste and a toaster oven.? hi hi
? ?73, Andy, KG5RKP
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On Sun, Nov 25, 2018 at 08:07 PM, Tim Gorman wrote:
Andy,
I've always used 450degF with my smd stuff and have never had a problem
soldering anything. I don't use a pointed tip but one with a small flat
on the end, a *very* small flat. Don't remember where I got it but it
works. The only problem with it is that when it gets hot it bends
easily so you have to be careful about the pressure you put on it.
tim ab0wr
On Sun, 25 Nov 2018 14:51:03 -0800
"AndyH" <ahecker@...> wrote:
I understand that heat's bad.? I'll have to try different tips as I
usually use a fine tip.? I usually dial back to about 600 ¡ãF when
soldering SMD.? I have a couple of recent successes hand-soldering
SI5351s.? The thing about this was that it had me doubting everything
except the real problem.? I was going nuts looking for cold joints,
broken end caps, copper foil glitches, and all the other usual stuff
like whiskers from RG173 but didn't even think to question that a 2.2
Ohm resistor that looked fine and tested fine could fail before a
transistor did.? But hey - I'm doing this to learn new things and I
can confirm that that's happening!
I've been desoldering 1205 and 0805 parts using the 'solder blob'
method.? I wonder if there's any benefit to the 'pronged' tips that
can reach around to both ends.? (That being said, I'd much rather not
have to remove parts.)
?One thing is not ripping everything up that?can be left alone.
That reminds me of this:
Hammer: ?$5
Knowing where to hit the machine with hammer: $4995
I can confirm that I'm not there yet.? hi hi
Thanks again for your help.? The radio seems to be capable of more
power on 40 and 20 after the re-work than right after I did the
initial mod.? I guess I'll keep it.? hi hi
Andy
On Sun, Nov 25, 2018 at 02:54 PM, ajparent1/KB1GMX wrote:
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Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Gosh! Never go against the Big Three!!! Glad to hear everything should be over!!!
Il 30/nov/2018 21:14, "Giancarlo via Groups.Io" <i7swx= [email protected]> ha scritto: Hi Farhan,
sorry to know about the problem you faced. Dodgy people re all over and also people that do not understand, still dodgy..hi.
My remote support for you.
73
Gian, I7SWX
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Re: Nextion Display: Source ???
I trust Worldchips store in Ali???but they have 2.4 and 2.8 inch LCDs, removed 3.5 and higher from list.
Alternatively Aihasd store is available with higher sales numbers??but I didn't buy from there yet. Make sure and ask seller to send Nextion branded, you know there is Chinese brand of this, I don't suggest that one. You can get basic version, works fine.
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Re: Nextion Display: Source ???
I got my nextion displays direct from their sale site ? 73 Pop VU2POP ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Dileep Balan
Sent: Friday, November 30, 2018 8:39 PM
To: [email protected]
Subject: [BITX20] Nextion Display: Source ??? ? Dear OMs,
Let me know from where you guys are buying Nextion Display?
I'm looking for a reliable seller, you might have experienced
I recently brought from AliExpress but received a damaged piece. may be mine would be special case. /g/BITX20/topic/nextion_white_screen_issue/28484958?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,28484958
Regrads & 73s,
Dileep VU2DLE
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Re: Consider the Bitx40, clean and cheap for 40m
?I have several thoughts on how to go about it.
?One is buying the BITX20 board set that uses the diodes and toroids for the mixers, and making a small board or two to use toroids as band pass filters. ? Another is to use small perf boards and making it modular. ?I could also salvage parts from and old CB, or possibly transformers and coils from a low band Mocom I have that is junk anyway. Using it for parts. ?I would not try making an analog VFO, but rather one of the DDS units I plan to build. I can use? caps other than compression type. I don't really like those. Only good for AM broadcast radios anyway, IMO ?I have some assorted caps I picked up that would work fairly well. Need a project or two for some anyway. ?The bare boards I already have are going to be BITX20 anyway. ?I spend more tome planning than doing lately.
Wayne WA2YNE
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Re: Totally Absurd -- Farhan being questioned in a police station about doctored sat picture
Hi Farhan,
sorry to know about the problem you faced. Dodgy people re all over and also people that do not understand, still dodgy..hi.
My remote support for you.
73
Gian, I7SWX
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Re: Bitx40 and nextion displays
#bitx40
Some where in Dr. Lee's replys,on his website, I thought I remember Dr. Lee congratulating someone
on getting the Nextion to run on a bit-x 40.? you might go through those threads
Andy Km4trt
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See other threads for addressing spurious. Our group build is adding a 45 MHz filter stage, and using a daughter board with relays. It seems to be an adequate and reproducible fix, we will know soon. We have spectrum analyzer access to verify, and if all 23 units pass, that would help builders who can't measure it. If this works, perhaps someone could offer a kit, as costly for an individual builder to have a board made and order the parts. I don't myself know source, but board file is available from someone.
Some AGC would be nice. The ND3T circuits are simple and seem reproducible. I don't myself need RF attenuation. But maybe I need the ham a mile away to hit me! We do meet when I do ft8. I am thinking most ubitx ops won't need rf attenuator.
I am using an external nescaf for cw and ssb filtering.? it works nicely at end of audio path. In my use I don't need the center filter control, just bandwidth.
Updating firmware for CAT interface seems natural.
Maybe a speech processor, but he careful not to add gain, there is no alc here.
If I ever use it on 160m, I am content to then make an external LPF.
As this becomes main or only rig for some ops around the world, all these things I mention should be low cost additions. We can wish for them in v5, but meanwhile many existing v3 and v4 owners need an easy path to get them.
Curt
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According to the reviews, you also have to get your own schematic.
And measure part values, as the caps are not identified.
Glad it worked for you, but this might not be a good option for many.
In my opinion, anybody putting a 70W amp on their uBitx
should have access to some sort of spectrum analyzer.
And know how to use it.
Jerry
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On Fri, Nov 30, 2018 at 07:44 AM, Lee wrote:
I built one of the cheap linear amplifiers from eBay.? Under $20 gets you 70 watts.? You have to get your own case and heat sink and filter the output.?? Since I only use 20 meters I put a single filter on mine.
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BPF would be a strong guarantee no overloading would be heard in the receiver (except for strong signals within the bandpass). Others have pointed out that brand transceivers have BPF in the TX chain. In my opinion for what it values, BPF have usually a loss, even if small like 3db would mean to many other changes in the TX chain. A RX only BPF plus the preamp close to the txrx relays would be much easier being essentially an add on. The ubitx claims to be rather robust to overload but in any case every receiver gets some benefit from BPF, I often use them, in contests with close neighbours is mandatory. I would add a switchable attenuator as well - 6, - 12, - 18db. This is my two eurocents.
Il 30/nov/2018 16:32, "inftechllc" < admin@...> ha scritto: Thanks everyone for the opinions!
I am going to skip the Tx/Rx light since it is displayed on the nextion (totally forgot about that)
What are everyone's thoughts on a good LPF kit?? I have looked at Tees and QRP versions.? Is one easier to integrate with the uBITX or are they near identical?? Have seen some posts about relay switching software changes required for the Tees version?
Also through reading, I have seen posts saying that a LPF and BPF are required for the uBITX to operate properly???
I would greatly appreciate any details on the if needed and the best/easy to integrate LPF and BPF kits/designs!
Thanks!
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I built one of the cheap linear amplifiers from eBay.? Under $20 gets you 70 watts.? You have to get your own case and heat sink and filter the output.?? Since I only use 20 meters I put a single filter on mine. -- Lee - N9LO? "I Void Warranties"
?
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Thanks everyone for the opinions!
I am going to skip the Tx/Rx light since it is displayed on the nextion (totally forgot about that)
What are everyone's thoughts on a good LPF kit?? I have looked at Tees and QRP versions.? Is one easier to integrate with the uBITX or are they near identical?? Have seen some posts about relay switching software changes required for the Tees version?
Also through reading, I have seen posts saying that a LPF and BPF are required for the uBITX to operate properly???
I would greatly appreciate any details on the if needed and the best/easy to integrate LPF and BPF kits/designs!
Thanks!
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Nextion Display: Source ???
Dear OMs, Let me know from where you guys are buying Nextion Display? I'm looking for a reliable seller, you might have experienced I recently brought from AliExpress but received a damaged piece. may be mine would be special case. /g/BITX20/topic/nextion_white_screen_issue/28484958?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,28484958Regrads & 73s, Dileep VU2DLE
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I? don't think a RX preamp is really needed. - 107dbm signal is clearly audible. However some 'digital hash' or artifacts could be buried by noise floor and this would be good. Being without BPF It should have high IMD figures, like the modern MMICs have.
Il 30/nov/2018 10:10, "Wayne Leake" < wayneleake@...> ha scritto: ? A preamp can help on RX.
?But I suggest having a gain control. ?Start with a good antenna first. ?For the RX/TX LEDs, I have some RGBs that I will use the red and green. Have not figured out a use for the blue yet. ?I don't know if I will add a TX amp or not. I will be working with BITX40s and BITX20. ?If I need that much power, I can simply use my 706 MK II G. ?A good antenna made for the frequency in 8use is far better than a random tuned with a tuner.
?And I found out that adding 75 meter legs to a 40 meter antenna was like adding both a preamp and a linear. A heck of a lot of difference. For 75 meters, that is.
?YMMV
?Wayne WA2YNE
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Re: Nextion White screen issue
@Snowist: I tried powering up from the Samsung mobile charger 5V, 1A.
Behavior is same. Yes, I also think that LCD may be defective.
Thank you for your suggestion.
Regards & Many 73s
Dileep VU2DLE
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Re: Ubitx v4 Raduino goes into Band Select menu during modulation
I had the same issue, however on 20m.? Traced it to rf riding the coax braid back from an off center fed dipole (MFJ-2010).? Solved it by grounding the shield before the radio, and placing a ferrite snap on core over the coax (RG8x) between the ground point and the connection to the radio.
Tried the ground only first, and it helped (could raise the power out to 6 watts), then added the ferrite to get it back to peak at 14 watts without causing the menu selection.? I did not have any issues on 40m.
My setup (using RG8x, PL259 connectors and PL259 Lightning arrester for grounding) is:
uBitx ======== SWR/PWR Mtr== Arrester ======== OCFD ? ? ? ? ? ? ? ? ^? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?^ ? ? ? ? ? ? Ferrite? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?Ground (water pipe in basement)
Hope that helps.
Evan AC9TU
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Ubitx v4 Raduino goes into Band Select menu during modulation
I have a v4 uBitx. I just installed the SM2166 mic preamplier per instructions on ubitx website.?
The radio works very well except this. If I try to push the mic preamp over a 2-3 watt output on 40 meters, the Raduino acts like I pushed the menu button and thinks I want to change the band. The TX continues and the output can be adjusted to be as high as 20 watts with this board. the CW output is around 20 watts on 40 meter. Simply pushing the menu button will clear this error when the TX is finished. If I adjust the mic preamp down to the point it won't do this I have less output than I did before.?
Any suggestions would be most helpful.?
Thanks.
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-- 72 and God bless KD4EPG
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Raj vu2zap
TA2WK
Giancarlo - I7SWX
Lee