Re: Nearly non-existent output power, no mod
On Thu, Sep 12, 2019 at 07:42 PM, Clark Martin wrote:
Use an RF probe or oscilloscope to trace the signal through the relays / filters.
?
?
OK, here we are:? On 80m and 60m, only the filter between the T/R relay and KT3 shows strong RF.? Power out on 80m is 2 watts CW, 1/2w SSB. 60m shows 1 watt/1/2 watt. On 40m and 30m,? only the filter at KT3 shows strong RF. Power out on 40m is about 3/4w CW and 1/2w SSB; 30m shows 1w CW. On 20m and 17m, only the filter at KT2 shows strong RF with power out the best: 2.5w CW but only 1/4w SSB on 20. 17m shows about 1/3 & 1/4 if that.... 15m and 10m show strong RF on the filter near KT1, with output on both bands less than 1/4w either mode (or should I just say, at barely detectable limits). The meter used is the analog dial on a MFJ 949D as my 5W slug is missing from the Bird wattmeter? :( The two predrivers and 4 drivers are all steel-can 2N2222's with 10-ohm bias resistors.? All six run fairly hot - with heat sinks added - though the 4 more so than the pair. The finals (even reputable ones) certainly get hot enough, too. if i put my fingers on the predrivers or drivers, the RF power (such as it is) decreases somewhat. Q90 is also a 2N2222 can with I believe a 15-ohm bias chip on it.? None of this changed prior to the output failure.? Obviously, energy is being produced but to what end?? It certainly isn't going into the dummy load or out the aerial/antenna/wirethingy. More guidance would sure be fantastic.? Thank you, all, for your input. Ted K3RTA
|
Re: Fix for Spurs and Harmonics on V3 Board
Dale
Yes remnants of many experiments here on this list. Those axicom relays may get your harmonics compliant or very close. Watch pinouts before you put them on the underside, they should work okay on top side. Some added the shielded inductors on the 45 MHz crystal filters, and obtained lower mixer spurs in conjunction with those axicoms. The v5 LC filter did nothing to improve mixer spurs on my v4.
That trap idea was difficult to tune even with a spectrum analyzer, so hence came the shielded inductors.
Curt
|
Re: Digimode low power output
Hi Adrien,
One possibility is the computer time.? Must be very precise.? If
you do not already have a time setting program, there are several
available.? I happen to be using Dimension4 from:
Is there a way to monitor your signal with another receiver??
Distortion or ground loops to the mic input could be an issue.
????? I like to use transformer isolation between the sound card
and the rig.? Eliminates any potential ground loop issues.? Also
isolated the PTT line (using RS-232 output) with an opto-coupler.
Here is what I did to interface my Elecraft K2, my 20 Meter
Homebrew rig, and the uBITX.:
73, Woody
--
|
Digimode low power output
Hi all,?
My ubitx is assembled since two days and I am starting playing with it.?
I've flashed the board with Kd8cec fw and with the standalone WSPR beacon mode I'm able to have at least 20 reports in less than 5 minutes, sometimes very far (up to 10000km).
So I guess the transmit is OK.?
I've tried also to connect my radio to my computer with 2 Jacks (BTW on the transmit cable plugged to mic you need to isolate the ring otherwise the PTT will be triggered : I've used a very small piece of tape around the tip to make the job done).?
Anyway with this setup I receive quite well other stations but when I transmit I've difficulties to be heard by two stations in 30 minutes.?
So I guess transmit levels are not OK but everything has been set to 100 % (both windows audio out, TX pwr in wsjtx and set to 40dbm 10w).
Do you have any idea of what is going on??
Thank you.?
--
73's
Adrien F4IJA
|
Re: Project : Ubitx go box with batteries (topic will be updated upon works done)
In fact with 3 cells in serie you can go down up to 9v normally. For now with 3s4p and making Ft8 and wspr since 2 evenings I'm at 12.1v so I guess the capacity is quite good.?
Yes you're right about the BMS. Not already installed because waiting for receiving it. But it's a must have!?
--
73's
Adrien F4IJA
|
Re: SDR and Ubitx freq not the same.
Very good question, and I might not be answering it.
?
I don't (at least I don't mean to) have a different frequency in my ?BITX for TX and RX; I'm not running split.? So for me they should always be the same.? And if I understand the theory of operation, no matter how screwed up the calibration is, the ?BITX is running the same frequency whether in or out in that state.
?
If that's the case then:
?
Suppose I send out what the ?BITX says is 14.074MHz + 2000Hz FT8.? Let¡¯s call this 14.076000 MHz.? It could be that the transceiver actual transmitted frequency is 14.073992MHz, and the audio tone is 1996 Hz or all together 14.075988, but my system says we¡¯re sending out 14.076000.
?
Suppose the contact that replies does not have ¡°Hold TX Freq¡± checked and responds to the CQ.? His FT8 screen might show me at 1500 Hz or 2500 Hz, but it doesn¡¯t matter, because if his rig is using the same oscillator for TX and RX, the math will wash out all the errors and I¡¯ll get back exactly what I sent him, a signal at 14.075988.
?
Since I¡¯m getting back exactly what I sent him, if there is a difference between what I sent at 2000 Hz and what I get back, it¡¯s the difference between my absolute TX and RX frequencies.? So if the FT8 screen shows his reply at 2017 Hz, I know I that my ?BITX and my SDR disagree by 17 Hz at 20M.
?
At least that¡¯s the way I understand the math, and it's a very elegant way that FT8 naturally keeps all of us neat and clean and polite with the small slice of band.
?
Someone did a youtube showing how to use split for FT8 that takes advantage of that.
?
Suppose you want to use a 3000 Hz tone for FT8, but your system works better at sending out a 1000 Hz tone than a 3000 Hz tone.? You¡¯re working 20M, set your TX freq to 14.076 and use the 1000 Hz tone.? To the person listening on 14.074, it sounds like a 3000 Hz tone.? Of course, you listen at 14.074 so that the system hears things normally.
?
Explaining this stuff would be a lot easier with a whiteboard and a pot of coffee.
?
|
Re: SDR and Ubitx freq not the same.
Can you verify if your last sentence is true no matter what you have selected
in the Memory Manager for frequency display( Send or Receive )?
Thanks, rOn
toggle quoted message
Show quoted text
On September 16, 2019 at 1:01 PM "Arvo W0VRA via Groups.Io" <arvopl@...> wrote:
To compare the frequencies of the ?BITX and the RSP1A, which I use together, I did an FT8 transmission with the ?BITX set to 20M, 14.074MHz and the FT8 signal at 2000Hz.? Without an RX antenna connected to the RSP1A, there was still a strong signal showing up in the WSJT-X FT8 screen.? So the PC with the ?BITX was doing the 14.074MHz + 2000 Hz, and the laptop with the RSP1A running FT8 was showing that signal as 14.074MHz + 1986 Hz.
I then applied the CEC principles of calibration to the ?BITX and got them within 1 Hz, sometimes 0 Hz.
They move around a little bit, probably because their temperatures are changing and affecting them differently.
Also, if someone is using a transceiver with a common oscillator for RX and TX (like another ?BITX) and responds to you on FT8 with their frequency the same as yours, you'll see the same difference between the SDR and the ?BITX.
|
Re: SDR and Ubitx freq not the same.
To compare the frequencies of the ?BITX and the RSP1A, which I use together, I did an FT8 transmission with the ?BITX set to 20M, 14.074MHz and the FT8 signal at 2000Hz.? Without an RX antenna connected to the RSP1A, there was still a strong signal showing up in the WSJT-X FT8 screen.? So the PC with the ?BITX was doing the 14.074MHz + 2000 Hz, and the laptop with the RSP1A running FT8 was showing that signal as 14.074MHz + 1986 Hz.
I then applied the CEC principles of calibration to the ?BITX and got them within 1 Hz, sometimes 0 Hz.
They move around a little bit, probably because their temperatures are changing and affecting them differently.
Also, if someone is using a transceiver with a common oscillator for RX and TX (like another ?BITX) and responds to you on FT8 with their frequency the same as yours, you'll see the same difference between the SDR and the ?BITX.
|
Re: No answer in Antuino group
IMHO, no changes needed. Mixer's performance being same, perhaps insersion loss or gain could be a factor. Calibration should tahe care, in my opinion.?
Regards Sarma vu3zmv
Hi All, As there is no answer in the ANTUINO group my question here:
As I used SBL-1 instead of ADE-1 from my junk box I wonder if there are differences to make into the software.
They are not exactly the same on specs and I do not know enough on the software.
Can someone tell me if I have to make changes and where?
Attatched photos of my home build ANTUINO.
Thanks
Rob PA0RBL
|
No answer in Antuino group
Hi All, As there is no answer in the ANTUINO group my question here:
As I used SBL-1 instead of ADE-1 from my junk box I wonder if there are differences to make into the software.
They are not exactly the same on specs and I do not know enough on the software.
Can someone tell me if I have to make changes and where?
Attatched photos of my home build ANTUINO.
Thanks
Rob PA0RBL
|
I have for sale an AS NEW In Plastic Shipping container uBitx Version 3. It was produced Prior to May, 2018 as it has the TDA2822 Audio Chip soldered to the PCB.
It is Un Built and AS New. Received 01/10/2018.
Asking Price : $90.00 and $5.00 for shipping. Total: $95.00 Shipped to US Addresses. If international buyer, then actual shipping cost will be applied.
Accept: PAYPAL. Money Order, or Check.? Please allow time for MO/Check to clear bank before shipping.
Please send any questions to kevinemtid at sbc global dot net .
Thank you Farhan for making a Great Rig! I am still working on my Bitx 40.??Yes I am a bit Behind in my projects!?But I Plan on acquiring a newer version uBitx in the future..?
73, Kevin NZ1I
|
Probably a bad batch, I stopped order parts from AliExpress. Had the same with a batch of IRF510. Complete rubbish.?
|
I suffered with 10pcs of? bad 78t05 from ali seller and demanded refund and got it.
I am using the Nextion 5"display. When building my Ubitx V5 I used a small step down converter to generate the 5V for the Nextion display. It all worked 100%
Now the building is almost finished i want to replace the 5V stepdown converter. ( It is giving a little amountt of noise¡)
I ordered ( Aliex..) 5 pcs of KA78T05 TO-220 stabilisors. ( is the 3A version-? )
Then I replaced the 7805 mounted on the Arduine and replaced it for the KA78T05 version¡. No working Arduino and no working display.
I find input=12V output=0V. ? Checked before and after the pinning? 1=input / 2 = earth/ 3 =output ? Find a datasheet on Internet and can not find what I am doiing wrong.
After that make a test print only for the KA78T05 and I can not get the 5V output. Output also on a 2nd KA78T05 is still 0Volt. ? Frustrating.? ( I used a 7809 on the same test and output was 9.00 Volt!)
What I am doiing wrong...¡¡.? ? ? ( ordered today local few 78S05 ? ( = 1.5A version? )
So who knows what I am doiing wrong...? ? ? ? ? ? ? ? ? ? ? ? Tnx.? Herman
|
I am using the Nextion 5"display. When building my Ubitx V5 I used a small step down converter to generate the 5V for the Nextion display. It all worked 100%
Now the building is almost finished i want to replace the 5V stepdown converter. ( It is giving a little amountt of noise¡)
I ordered ( Aliex..) 5 pcs of KA78T05 TO-220 stabilisors. ( is the 3A version-? )
Then I replaced the 7805 mounted on the Arduine and replaced it for the KA78T05 version¡. No working Arduino and no working display.
I find input=12V output=0V. ? Checked before and after the pinning? 1=input / 2 = earth/ 3 =output ? Find a datasheet on Internet and can not find what I am doiing wrong.
After that make a test print only for the KA78T05 and I can not get the 5V output. Output also on a 2nd KA78T05 is still 0Volt. ? Frustrating.? ( I used a 7809 on the same test and output was 9.00 Volt!)
What I am doiing wrong...¡¡.? ? ? ( ordered today local few 78S05 ? ( = 1.5A version? )
So who knows what I am doiing wrong...? ? ? ? ? ? ? ? ? ? ? ? Tnx.? Herman
|
Re: Project : Ubitx go box with batteries (topic will be updated upon works done)
On Mon, Aug 26, 2019 at 09:50 AM, Adrien F4IJA wrote:
I'll make a 3S battery pack (3x 4.2V fully charged, so 12.6V), and I've ordered 3300 mAh cells. I'm thinking about making a 3S4P battery pack, so the capacity will be 13200 mAh.
Lithium-Ion batteries have a voltage operating range of 4.2V (fully charged) down to 2.8V? , hence 1.4V. ?Question : would 3x2.8V= 8.4V be adequate to operate the Ubitx ? If not I would suggest you use 4 sets of (parallel) cells in series . This would give an operating voltage range of? 16.8 V - 11.2V , hence 5.7V??? , assuming 16.8 V is acceptable for the complete radio . Also ensure that you use? a max voltage equalising circuit to prevent overcharging of any of the cells being charged as part of the pack. FYI : Chinese on-line retailers can supply (low cost) compact 18650 battery holders for either 1 or 4 cells permitting cells to be flipped-in (hence no soldering or spot welding)? These holders also enable easy cell replacement . I have recovered good cells (capacity checked) from discarded laptop battery packs . When a laptop pack is no longer usable for its intended purpose , often only 1 of the usually 6 cells is no longer OK , but the others still are. Frank?? ,??? EI7KS
|
You can load it into the Nextion editor (free download) and flip it (odd number of degrees, not just "180", maybe 270?). Then re-save. ?Try to make sure that the sdcard slot is on top... Makes it possible to update the screen without disassembling your ubitx.
73
Mark
AJ6CU
|
Yes, you can. If you have the .hmi file, open it with the Nextion editor, select Device on upper right hand of command ribbon, select Display on left, select 270 horizontal, and recompile. I compile mine upside down so the sdcard port is reachable on the top.?
|
Re: Overvoltage to Ubitx - now no receive
I do work T 19v using a laptop adopter selected for low ripple. But , I DO TAKE CARE? that a 12v 2 amp regulator supplies to blance circuitry other than the final IRFs. There also the current is adjusted to say 80mA. If the due care is not taken , obviously components would fail. Om Bose might take a cue from Allison's advise.
On Sun, 15 Sep 2019, 6:54 pm ajparent1/KB1GMX, < kb1gmx@...> wrote: Sumit,
You grossly over voltaged the LM386 audio amp.
Other parts are likely suspect but start? there.
Start at the speaker and work back.
FYI: the only parts that would tolerate more than 15-16V would be the finals IRF510.
Allison
|
Re: Compliance Summary - other radios
Not a bad deal (as of date of this message) considering those "kits" on eBay that self-destruct upon contact with electricity:
?
|
Please don't think of me as obtuse, though, in what way is your rectangular opening "upside down" for the display??
I would second the recommendation of using a surrounding bezel to take care of this, short of going with a larger size which might negatively alter the paradigm of the rig you're working toward.
|
Ted
Arvo W0VRA
Kevin Gilot NZ1I
PA3GYV - Werner