Question for those who might have an answer to this issue.? I noticed with my Daylight again build when listening to a strong CW signal (W1AW) or another strong signal, I hear the same station 39-40KHZ lower. For example, I zero beat W1AW and my frequency counter reads 7047. The other signal zero beat is 7008. The false signal is weak but is readable. I did a test with my signal generator and the input signal must be 300uv or higher to hear the other signal. I do not hear anything above the strong signal(s).?
I have been scratching my head trying to understand what could cause this. Stage isolation, Crystal filter, PTO/BFO harmonics or nature of the beast. Ideas?
TU
Barry
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What mic will work with the sbitx.
What mic will work with the sbitx ? brand and model? Also I am looking at just rewiring a mic but, I can not find a schematic for the microphone just the connector in the radio. Also please tell me what is meant on the print by
RN and TN at the J5 Mic connector? Sorry for the dum questions but I am new at ham radio.
Thank you.
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Re: sbitx LOSS OF MIC TX AUDIO
messed up my sbitx? &? k3ng directories, trying to reload,,,,? trying to reload settings for audio ..., AND in the process I ""restored"" audio . WHICH WAS MY INITIAL GOAL.../...
now to learn more about linux
BILL
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On 9/21/2022 10:50 AM, bill steffey NY9H wrote: HELLO ANYONE ,..
MY sbitx worked for about a week, then I lost my microphone audio /
could it be muted somehow ??
the electret has bias ( 9v) .... and MIC audio is making it to the main board....
Two tone & FT8 transmit audio ...BUT no mic.
I'd believe that some software is my issue, rather than a device failing ,,,,,,,
any ideas to UNBRICK my radio ...?????
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Check the Wiki as there are a ton of mods for? V3.
Allison
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Please use the forum, offline and private will go to bit bucket.
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Followed your instructions and I can now run your version or Ashhar's from icons. They are both working great.? It occured to me that it would be nice if you could add a letter or date after the sbitx 1.1 on the display so as people bring up issues you know what version they are running. Or maybe there is some other command that could display this.
Thanks again for all your support!
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Does anyone know if an agc for the V-6 will come available again soon? Not a big deal but would be nice to have.
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That is great information Shirley, mind if I share it?? -- '72
Aaron K5ATG
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Up for sale is a brand new, in shipping box, unbuilt Ubitx, Version 6 from HF Signals. I purchased this unit by mistake and couldn't cancel the buy. I am asking for $200 shipped withing the 48 US states. If interested respond via DM/PM. Email address is good on QRZ. Accept PayPal or Zelle.
- Up to 10 watts pep on lower HF bands, dips to 5 watts on 28 MHz
- SSB and CW
- Simple to build and align
- Minimal controls
- Based on Arduino Nano controller and a Si5351 for all local oscillators
- Double conversion, superhet architecture
73 Art N2AJO
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C95 is an electrolytic capacitor. It has distinct positive and negative terminals, and must be installed in the correct direction. It won't work properly if the positive and negative terminals are reversed. A polarized electrolytic capacitor requires that the positive terminal ALWAYS be more positive than the negative terminal; it's typically?used in a circuit where DC bias makes sure that is the case. It has a diagram that distinguishes the positive and negative terminals.
C28 is a ceramic capacitor. It is not polarized; the two terminals are interchangeable, and either end can be more positive or more negative. Therefore it has a diagram where both terminals look the same. In the sBitx kit C28 is an SMD capacitor, though if you prefer to use a through-hole cap in your homebrew build you can do that. (Nowadays it's the same part in most cases. The multilayer ceramics that have a blue or tan rectangular-ish encapsulated section are actually SMD caps with leads attached to the ends! Only the round discs, which are mostly only used for low value capacitors nowadays, use the older method of construction.) If the capacitor is serving as a bypass for a complex IC, you'll usually want to stick with SMD parts because you can get them physically closer to the chip.
In most but not all cases, you can replace a polarized electrolytic capacitor with a non-polarized ceramic capacitor if a part of the correct value and voltage rating exists. (That has actually happened in the T41-EP project, another SDR. The schematic shows electrolytics in a couple of places where the published BoM uses ceramics; builders are using the ceramic capacitors in place of electrolytics.) Ceramics up to 10 microfarads are readily available now and inexpensive, and have replaced electrolytic capacitors in many products. Even higher values are available but only at low voltage ratings.
In many?cases you CAN'T replace a nonpolarized capacitor with a polarized electrolytic. Its frequency response is too limited, its leakage current is too high, or there is no DC bias in the circuit. Electrolytics are mostly pretty bad at bypassing RF, which is why you often see a large electrolytic and a smaller ceramic in parallel at the output of a power supply; the electrolytic takes care of filtering out low frequency ripple components, while the ceramic handles bypassing RF frequencies to ground.
Hello all,
I'm committing myself to build a homebrew version of the sBITX. I have experience in kit building but not much in homebrewing. My personal opinion is that kit building and homebrewing can be pretty different. I would like to share my build here on this thread. Although those of you who know me are realizing that this will be more for me asking dumb questions than building.?
This project came about from talking with Ashhar VU2ESE and me realizing that I really need to focus on something besides my failing health. As a bonus, I could accidentally learn something.?
So being true to form I have my question. I'm going over the schematics and coming up with a parts list so that I can get an idea on what I have on hand and what I need to order. As said I'm new at this and I have a question on the schematic symbols of capacitors.?
In the picture above I found two different symbols for capacitors and my cheat sheet on schematic symbols shows capacitor symbols that are a little bit different. . Please correct me if I am wrong here but I'm guessing that C95 is an electrolytic cap and C28 is a run of the mill disk cap.
--
'72
Aaron K5ATG
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Thank you Chris -- '72
Aaron K5ATG
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Yes you are correct the + is the positive side of the electrolyte and the other is just regular cap . Only dumb questions are the one that's not asked 73 DE Kd9usk? -- Chris Mannon
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I¡¯m planning on a 6 x 3 x 1.5 inch heatsink mounted with a brace and not changing any lead length on the fets. Leave them as is with mica TO-220 insulators and compound. ?I will work on cleaning up the output. Case fan too. The mike amp circuit needs some work as well. A Pelican case with a thin plywood front panel till I get everything worked out. Aluminum later. On the plus side receive is great. Not much output as stock on ssb even with a powered microphone. CW output is good. I have seen some if the posts about mike preamp resistance changes too. At least it¡¯s in the case and mounted. Heatsink is on the way. The Bitx 40 is almost done too.
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Heatsink for that level has to be BIG.? Say 2" x4" with 1" fins.
Devices need to have shortest leads possible and the heatsink must be
grounded so that means insulator kit.? Do not be surprised if the amp
goes unstable or blown devices I suggest at least several pairs till you
get it right.? Look up all TX mods.
Unless the LPF filter were modded (V3) it will be dirty.? Its really a
must fix.
Quiet 12 to 24V, I found several that looked the same one was quiet
the others were terrible. They had identical markings.
Good luck.
Allison
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Please use the forum, offline and private will go to bit bucket.
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Too many projects, too little time and money... I ordered a v.3 uBitx when they were first announced, then promptly back-shelved it. Anyone want to take a shot at it? Drop me an email with an offer.
--
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Bruce H. McIntosh bhmcintosh@... www.afn.org/~scotsman WA4UF
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Network geek with a strong affinity for Telecasters
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Hello all, I'm committing myself to build a homebrew version of the sBITX. I have experience in kit building but not much in homebrewing. My personal opinion is that kit building and homebrewing can be pretty different. I would like to share my build here on this thread. Although those of you who know me are realizing that this will be more for me asking dumb questions than building.? This project came about from talking with Ashhar VU2ESE and me realizing that I really need to focus on something besides my failing health. As a bonus, I could accidentally learn something.? So being true to form I have my question. I'm going over the schematics and coming up with a parts list so that I can get an idea on what I have on hand and what I need to order. As said I'm new at this and I have a question on the schematic symbols of capacitors.?  In the picture above I found two different symbols for capacitors and my cheat sheet on schematic symbols shows capacitor symbols that are a little bit different. . Please correct me if I am wrong here but I'm guessing that C95 is an electrolytic cap and C28 is a run of the mill disk cap. -- '72
Aaron K5ATG
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Re: Replacement Nano problem uBitx V6
Gary
I got sidetracked by other projects. ?Also, I'm planning to make an adapter so I can try other Nanos that have pins on the normal side of the board - I have at least one of those on hand.
I hadn't thought of the touch screen calibration issue though since the touch screen is unresponsive, I'm not sure how I'd get there. ?But this gives me something to think about.
Thanks
Howard
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Re: Replacement Nano problem uBitx V6
On Mon, Sep 19, 2022 at 04:43 AM, K4LXY wrote:
The radio wasn't turned on. ?I've tried uploading with the Nano in the radio and with it out. ?It uploads fine but doesn't function properly.
73 Howard
Howard, Have you resolved your issue?? From everything you described.? It seems like calibration value issues. The touch screen also needs the correct calibration values.? ? Rgds, Gary
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Re: sBitx regulator upgrade info/help with problem
#sBitx
Kit arrived today. Will install next week. Hamfest this weekend?
sbitx #62
art N2AJO?
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Re: Finals and Switching Regulator
Thank you Lou, I will try that. | ? | Jason Johnston
KC5HWB, Ham Radio 2.0 | | |
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On Wed, Sep 21, 2022 at 11:59 AM Lou KI5FTY < lscalpati@...> wrote: Jason I believe you can email? hfsignals@...?to request the regulator. BTW I enjoyed your video on the sbitx?(and all your other videos).
On Wed, Sep 21, 2022 at 11:15 AM Jason Johnston < kc5hwb@...> wrote: Is it possible to get a switching regulator for replacing the finals on unit #103?? If not, I'll need to return the device.?
Hi Ashar, I'd like to get a replacement switching regulator, please. | | ? | Jason Johnston
KC5HWB, Ham Radio 2.0 | | |
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On Sat, Sep 17, 2022 at 12:12 PM Jason Johnston via <kc5hwb= [email protected]> wrote: I received my sBitx unit a couple of weeks ago and it came with extra finals, but no switching regulator.? It seems I have smoked the finals inside of the radio, so I need to replace them with the extra finals I received in the package, but I need the switching regulator also.? My serial?number is 103.
Thanks | ? | Jason Johnston
KC5HWB, Ham Radio 2.0 | | |
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W6LKB
Shirley Dulcey KE1L
Aaron K5ATG
mrz80
