Date   

Re: What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

Curt
 

OM

how is your output power on CW?  take power readings on CW even if you don't use this mode.  this will tell us how the PA etc are working. 

some experience weak audio drive that hampers SSB transmit power - a few in our club build.  I am fortunate that using a surplus speaker microphone I had works swell, but others are not so happy.  some are adding a preamp or even a speech processor IC to their audio chain.  I think you need some patient experimenting, after affirming CW power is okay.

if you have a different microphone to try - I would.  also consider building an audio oscillator as a test source. 

73 Curt


Re: Homebrew li-ion battery pack into ubitx

Sandeep Lohia
 



On Mon 15 Apr, 2019, 8:42 PM Jerry Gaffke via Groups.Io, <jgaffke=yahoo.com@groups.io> wrote:
The transformer of an EFHW  matching network matches the 50 ohm transmitter
to an expected impedance into the wire of between 2500 and 3000 ohms.

Power is Volts*Amps, or Volts*(Volts/Ohms).
At 5 Watts of RF power,    5watts = Volts*Volts/3000ohms,   therefore  Volts = sqrt(3000*5) = 122 Volts RMS.
At 100 Watts, it's still around 548 Volts RMS, not yet kilovolts

Thanks Jerry, was helpful...
& here's online calculator too :


Guys, any way can we know voltages approx across 20M traps ?
excited with 25 watt...



The polyvaricons are rated for something around 100 Volts:
    https://www.mikeselectronicparts.com/product/variable-capacitor-335pf-20pf/

Generally, you can press a polyvaricon somewhat beyond 100 Volts.
A polyvaricon works at 5 Watts for an EFHW, though an air-variable cap would be a better choice.
If an air gap does arc over, it will self-repair once the ionized air circulates out.
And an air gap capacitor has a higher Q, and thus lower losses.

The qrpkits Sota Tuner successfully uses a polyvaricon:in an EFHW tuner:
    https://www.qrpkits.com/sota.html
They claim a max of 5 Watts CW, 10 Watts PEP.
On 10 Watt peaks, that would be  sqrt(3000*10) = 173 Volts RMS.
Perhaps they are more concerned about heating than they are about arcing?

Anything other than a resonant EFHW will be lower impedance,
and thus lower voltages across a tuning capacitor.

Jerry, KE7ER



On Mon, Apr 15, 2019 at 12:33 AM, Sandeep Lohia wrote:
End fed 1/2 wave is a voltage fed antenna Sarma ji, there might be more then kilo volts present even with QRP at end of coil...
Therefore thin PVC variable Gang Capacitor won't help...


Re: wsprnet results, wsjt-x, and calibration success --> world domination V4 #calibration #firmware

masch57
 

Congrats on turning it loose Don, those are some really nice results.  I'm envious of your antenna doing so well without a tuner.  I hadn't noticed those pie charts before, but yes 30m is a pretty good band these days, for small bandwidth work at least.  


Re: Lista component for ubitx 5 #ubitx

CiccioSamui
 

Thanks exactly what I looking for...... 


Re: quick mod to USB cable to remove VCC for CAT control

Joe Puma
 

Good idea. It bugs me too when I power off the radio and the raduino is still on. It powers the radio too because when I have my pan adapter hooked up I can still receive signal, just a little weaker. It’s so weird. 

Also when you turn the radio back on you lose tuning control. You have to reset the raduino. 



Joe
Kd2nfc 



On May 18, 2019, at 3:24 PM, Doug W <dougwilner@...> wrote:

I finally got around to putting KD8CEC's outstanding FW on my V3 µBITX.  When I'm not using the rig for other things I leave it on to rx WSPR.  Using CAT control for band hopping is fantastic.  I did not want power over the USB cable going to the raduino when the rig is otherwise switched off or at all for that matter.  There may be a more elegant solution but as they say, done is better than perfect.  I stripped back the insulation on the cable, parted the shielding, and like a B movie bomb tech I cut the red wire.  With a little heat shrink on the cut ends, some copper foil to repair the shielding, and electrical tape to replace the outer jacket it looks good as new...from 100 yards :)  I realize this isn't a revolutionary break through but I figured it was worth sharing.
--
www.bitxmap.com


Re: wsprnet results, wsjt-x, and calibration success --> world domination V4 #calibration #firmware

Don - KM4UDX
 

I read that bit about BFO adjustments till static sounded "good".  i suspect that the "good" guidance works just fine -- as soon as you ear learns what good static sounds like. hahaha.  

You also have to figure that trial and error is a totally legitimate problem solving technique in this domain. So gird your loins and have at it. (Yes I had to look up the expression..hahah) 

I'll add to my summarization with this extra bit. 

if you want to do band hopping using the wsjt-x band hopper functions (which is wicked cool, says me), then you want an antenna contraption working on more than one frequency. My solution was my 80-10 OCFD run without an antenna tuner.   Yes the SWR is "variable" across the bands, but once you realize that a SWR change from 1.4 to 3.5 is small potatoes on the receiving end, you can embrace a multi-band antenna and have at it. The key here is to not actually look at SWR too often. Just run with it. 

Given that there will be a few no-go bands (no antenna seems to do it all...darn the physics), you do need to sweep your antenna as installed, find the bands with zip resonance, and be sure to EXCLUDE them from the wsjt-x band hopping click boxes.  

The dead zones for me includes 30m, where the SWR is approximately infinite. It wouldn't matter to me, but if you look at wsprnet activity reports, you see that 30m has a sizable percent of all WSPRnet activity.  See the pie charts below.  Turns out that 30m is the third most active band behind 40m then 20m then 30m.  

And my antenna is barren, lifeless, empty, massively indifferent to 30m. Think of all the action I'm missing (like in high school).  I could not let this be. So I've calculated adding  30m OCFD wings split at 29.5% of total (to match the existing 80-10 split point). This is like a fan dipole -- and they work, right?  I expect it will completely screw up the works. I will surely  regret ever trying to improve what is really great as is. But "good enough" can always be made "worser" with enough improvements. 

So i am off to safari seeking the 30m game. Solder at the ready and push onward!


What's a Reason for less Power Output ONLY get 4W on 80m?.., 3-4W on 40/20m, 1W on 15/12/10m #ubitx #ubitx-help

sdr freak
 

I need your Help, reaaly no Idea for this low, very low Power Output..

...if there is an way, an idea or something i could do it was not described in any post till now or i read it not because i have read all post for this "low output power" issue what i can read in this forum, but i find difference things was write there and i look to make all i can test or put like these post was saying.. but nothing get right..

My problem is the output transmit power, get only 4W on 80m, 3-4W on 40m/20m and 1-2W on 15m/12m/10m and the messuare was take by Dummy Load and on Antenna the Value is the same so there not different and i have on 80m only 2 Qso and 40m only 1 Qso till now with many Antenna testet and other Band testet but not heared by other ham so same by test with websdr.com try to hear me, but there was nothing able to hear me..

so the test on RV2 and RV3 with fully clockwise: Rx only is 150mA, Tx PTT only without speaking is 380-400mA 
when set on RV2 and RV3 for each on 100mA, both together 200mA to the 380-400mA then i have 600mA PTT no speaking when the Bias setting up like it should sayed on hfsignals.com but now when Tx PTT now with a load Hallooo to the original Mic Cap, then the Current is 1Ampere but on Dummy Load only 10-11V and on Power Meter 3-4W and when set RV1 to max power at fully counter clockwise then 5W getting but overmodulation so i seg RV1 like half way like it was before.. now i have test the Q90 Transistor in no Battery,no Power up Ubitx for shortet Transistor but it does not give a short with dvm test or should i test it in other way?

The Q90 was my only idea to try a new on in TO-92 solder in but i don't know if i should do this or should test other things..

The R63 resistor i have read can be reduced to 22Ohm for more mic audio.. but that should not give the issue away because on CW my power output is the same low value at the bands and on 80m get 3-4W cw on 40m 2-3W and than it goes lower,too .. on higher bands like 20m,15m,10m it was 1-2W..

What can i do, WHAT SHOULD I DO? I want only the normaly power output like on hfsignals.com saying and the other user would have..i want it too..the normaly power..this is all i want, please..

The ubix, when it have at one day should have 10w on 80m and 7w on 40m and 20m, than i would be lucky as hell but in reality the ubitx should have this 10w on 80m and 7w on 40/20m or have i fucked something up in readi g this information all there was saying by the motly ubitx users they have this minimum 10w.. 

I have good Receive, very good sounding and the only thing whit trouble is the power output is too low and thats all i would be have missing would say, when this issue gone cleaned up and the power output is on the right value with 10w my ubitx would be very best Qrp Transeiver for me and i'am lucky when dreaming of this many days outdoor transmitting i would love so much with this lovley little machine.. i have so much love to give kn this ubitx and i thought for many upgrades would be present when the transmitting output issue was done in right setting, i would upgrade things like agc, s-meter, cw-filter, battery-case, speech-ic, integrated qrp tuner with swr meter, these are the things i have here for waiting to build up and put in the ubitx..

So my project only make trouble in one point where i have no idea..


quick mod to USB cable to remove VCC for CAT control

Doug W
 

I finally got around to putting KD8CEC's outstanding FW on my V3 µBITX.  When I'm not using the rig for other things I leave it on to rx WSPR.  Using CAT control for band hopping is fantastic.  I did not want power over the USB cable going to the raduino when the rig is otherwise switched off or at all for that matter.  There may be a more elegant solution but as they say, done is better than perfect.  I stripped back the insulation on the cable, parted the shielding, and like a B movie bomb tech I cut the red wire.  With a little heat shrink on the cut ends, some copper foil to repair the shielding, and electrical tape to replace the outer jacket it looks good as new...from 100 yards :)  I realize this isn't a revolutionary break through but I figured it was worth sharing.
--
www.bitxmap.com


BLT

Sandeep Lohia
 



---------- Forwarded message ---------
From: Sandeep Lohia <sandeeplohia12@...>
Date: Sat 18 May, 2019, 3:28 PM
Subject: BLT
To: <emrfd@...>


http://4.bp.blogspot.com/-9TnqHWtCgzY/VavZixpGnEI/AAAAAAAAARo/YOs7E-OTHZM/s1600/VU2ESE%2BBalanced%2BTuner.jpg

*C1 ground really necessary in middle?

this increasing the count of switched SM caps...







Re: uBITX v3 For Sale

WA9GQT@...
 

My uBITX v3 has been sold.  Thank you all for looking. 
73, Rod WA9GQT


Re: Antuino

Don--AE4DW
 

On Fri, May 17, 2019 at 09:15 AM, Don W wrote:
I'm just discovering the Antuino and reading a bit about it. Is there a source for a kit or, at minimum, the pc board?
Still scraping the egg off my face..totally missed the obvious link on the hfsignals page.


Re: upgrade firmware 0.20 to 3 or 4

Olivier Grand
 

So it's a V3
Regards Olivier

Le sam. 18 mai 2019 à 19:13, Olivier Grand via Groups.Io <olilou1961=gmail.com@groups.io> a écrit :
Hello all seems to be a TDA2822 as Audio amp
Regards 
Olivier

Le sam. 18 mai 2019 à 13:02, danilo datres <in3izq@...> a écrit :
here  some pics...  for  your help.   tnx in advance  danilo in3izq


Re: upgrade firmware 0.20 to 3 or 4

Olivier Grand
 

Hello all seems to be a TDA2822 as Audio amp
Regards 
Olivier

Le sam. 18 mai 2019 à 13:02, danilo datres <in3izq@...> a écrit :
here  some pics...  for  your help.   tnx in advance  danilo in3izq


Re: Original Bitx20 design

kc0wox Leeper
 

You can find historical documents on the original bitx20 at http://golddredgervideo.com/kc0wox/
They date all the way back to some of the original boards.
Leonard


Morse Code Tutor

Jack, W8TEE
 

All:

The source code and schematic from my FDIM talk on the Morse Code Tutor is now available in the Files section on SoftwareControlledHamRadio groups.io Group.


Please note that there are still some changes that I plan to make to the code, but I have no plans to change the hardware of the MCT. Al and I consider the MCT to be Open Source, subject to the MIT Open Source agreement. (This more-or-less means that you need to leave my headers in the files.)

Note that there are multiple files in the zip file and those files must all appear in the same project directory. There are also some non-standard headers used that are not part of the standard Arduino IDE. The URL for these non-standard headers are given after their #include directives in the MorseTutor.h header file. This is to be expected because the code uses the STM32F103 ("Blue Bill") microcontroller. This requires you to install the STM32F patch, and there are plenty of places to find help doing that. I used "Using the Arduino IDE with the STM32F" as my seach in DuckDuckGo (I'm done with Google) and found plenty of entries from which to choose, both videos and written.

Jack, W8TEE



Re: Inexpensive eBay Amplifier Kits

Joe Puma
 

Do you have a link to this video?

73
Joe
KD2NFC 


On May 18, 2019, at 11:05 AM, KM4TRT via Groups.Io <garello@...> wrote:

Hi N8DAH,
Thanks for the tip on Wa2EBY.  When I saw that GoldDregger Video had purchased the boards and done a complete build and test on the amp AND the accompanying  multi band filter, I went to FAR circuits and ordered the boards
They are 19.50 US + $3.5 shipping
Andy


Re: Lista component for ubitx 5 #ubitx

Curt
 

OM

the most difficult to source components (crystals, toroids, etc) can easily be seen here.  the other parts are more common, except the new v5 suggests using some VHF NPNs in the 45 MHz amplifier.  I don't know if there is a documented parts list.  Most of us purchase a circuit board kit to assemble and modify. 

http://www.hfsignals.com/index.php/ubitx-circuit-description/

Curt


Re: Original Bitx20 design

N7QL
 

Thank you Mark for that. I want to build it and if it works then I can make mods. I will build each section in modules so that if a mod doesn't quite work the original should work assuming no major snafus. 


Re: Inexpensive eBay Amplifier Kits

KM4TRT
 

Hi N8DAH,
Thanks for the tip on Wa2EBY.  When I saw that GoldDregger Video had purchased the boards and done a complete build and test on the amp AND the accompanying  multi band filter, I went to FAR circuits and ordered the boards
They are 19.50 US + $3.5 shipping
Andy


Re: uBitx "Shadow"

YO8UFO
 

Thanks for your advice, Evan./// It's model V4. Thanks!