Date   
Re: Complainers?

VE3MIC
 

Bill, I too used to pass on kits that involved winding torroid cores, but after investing in a really inexpensive inductance meter, I can now verify my work by ensuring that the torroid that I just wound is the proper value before continuing on.  Han's QRP Labs kits are, in my opinion, the best that they come these days, and I am looking forward to the QTX when it is released. I also have a BITx40.

Don't let torroid winding discourage you. It's not until you wind them for 160m & below, that the number of turns gets unwieldy. I've lost count of my turns more than once, and had to start over again :)
Also, I've often wondered if there is an online calculator where you could enter the torroid type/size, wire gauge, etc., and it would display the length of wire needed for winding for the desired inductance. It wouldn't be exact, but get you in the "ball park" where you could then verify with an inductance meter before finishing off things.

73 de Mike

Re: Complainers?

Ashhar Farhan
 

Mike, 

such a resource does indeed exist. 

- f


On Sun, Feb 10, 2019 at 11:44 PM VE3MIC via Groups.Io <ve3mic=yahoo.com@groups.io> wrote:
Bill, I too used to pass on kits that involved winding torroid cores, but after investing in a really inexpensive inductance meter, I can now verify my work by ensuring that the torroid that I just wound is the proper value before continuing on.  Han's QRP Labs kits are, in my opinion, the best that they come these days, and I am looking forward to the QTX when it is released. I also have a BITx40.

Don't let torroid winding discourage you. It's not until you wind them for 160m & below, that the number of turns gets unwieldy. I've lost count of my turns more than once, and had to start over again :)
Also, I've often wondered if there is an online calculator where you could enter the torroid type/size, wire gauge, etc., and it would display the length of wire needed for winding for the desired inductance. It wouldn't be exact, but get you in the "ball park" where you could then verify with an inductance meter before finishing off things.

73 de Mike

Re: Auto ATU

Lawrence Galea
 

Thanks


On Sun, Feb 10, 2019 at 5:16 PM MadRadioModder <madradiomodder@...> wrote:

The moderator bounced the guy that was designing the cheap ATU kit for sale.  I’m sure we will see it at Dayton for sale though.

 

Greg - MRM

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Lawrence Galea
Sent: Sunday, February 10, 2019 11:03 AM
To: BITX20@groups.io
Subject: [BITX20] Auto ATU

 

Any news about this?

 

 

regards to all


Virus-free. www.avg.com

--

…_. _._

Re: Complainers?

VE3MIC
 

Excellent!
Thank you Farhan
Best wishes for your continued success with your projects.
de Mike

On Sunday, February 10, 2019, 1:16:27 p.m. EST, Ashhar Farhan <farhanbox@...> wrote:


Mike, 

such a resource does indeed exist. 

- f

On Sun, Feb 10, 2019 at 11:44 PM VE3MIC via Groups.Io <ve3mic=yahoo.com@groups.io> wrote:
Bill, I too used to pass on kits that involved winding torroid cores, but after investing in a really inexpensive inductance meter, I can now verify my work by ensuring that the torroid that I just wound is the proper value before continuing on.  Han's QRP Labs kits are, in my opinion, the best that they come these days, and I am looking forward to the QTX when it is released. I also have a BITx40.

Don't let torroid winding discourage you. It's not until you wind them for 160m & below, that the number of turns gets unwieldy. I've lost count of my turns more than once, and had to start over again :)
Also, I've often wondered if there is an online calculator where you could enter the torroid type/size, wire gauge, etc., and it would display the length of wire needed for winding for the desired inductance. It wouldn't be exact, but get you in the "ball park" where you could then verify with an inductance meter before finishing off things.

73 de Mike

Re: Complainers?

Evan Hand
 

We have not seen the final results of the QSX (I think that is the unit you mean) from Hans, G0UPL, only the material on the web pages.  You are also going to wait for the multi-band upgrade, as the first kits will be single band.

One point for me is the ability to add the Nextion type of display to the uBitx.  I have ordered the v5 board, am already planning to mod the current KD8CEC code to work with the v5 board, assuming someone else doesn't do it first.  I have 2 v4 boards, one with a Nextion display.   I have gotten spoiled with the features of the KD8CEC software/graphics screen.  Not sure how that is possible with the QSX. 

For me, I am fortunate in that I can have both to play with.  It is the building and problem solving that is the fun of the hobby for me, not so much making contacts/QSOs.

73
Evan
AC9TU

Re: Complainers?

Evan Hand
 

There is a web page that calculates inductance AND wire length needed with 1" leads.  It is here:
https://toroids.info/
or
http://coil32.net/online-calculators/ferrite-torroid-calculator.html

If that is not what you want, then a quick search on google or other search engine should get you what you want.

73
Evan
AC9TU

Re: Complainers?

Donald <donwestpwl@...>
 

I use Mini Ring Core Calculator. It calculates length of wire and maximum wire size in AWG or mm units (your choice), for most Amidon cores, both iron and ferrite. It also lets you enter the number of turns and shows you the inductance and reactance for a given number of turns on a given core at a given frequency, so you can see what happens if you add or remove a turn. It will also calculate air core coils. Also has a resonance calculator for LC values, and can tell you inductance of a straight piece of wire. I use version 1.2, but see there is a newer version, now.

Free, from here:

http://www.dl0hst.de/mini-ringkern-rechner.htm

Very handy for me. -- Donald, KB5PWL


On 2/10/2019 1:46 PM, Evan Hand wrote:
There is a web page that calculates inductance AND wire length needed with 1" leads.  It is here:
https://toroids.info/
or
http://coil32.net/online-calculators/ferrite-torroid-calculator.html

If that is not what you want, then a quick search on google or other search engine should get you what you want.

73
Evan
AC9TU

Re: LPF kit for ubitx v3

Sascha Bohnet | DL5SMB
 

Hi Ted - just  as a tip:

If you do not plan on using the old relays, it is a LOT easier to sacrifize them :-)

Using solder wick it was easy for me to get rid of most of the solder and loose the relays a bit.

In fact i had nearly no difficulties at all to get at least 1mm between he pcb and the relays when i used a screw driver as leverage:

And if you then just use a a thin saw blade without the frame  and cut all the pins, it is easy to take the relays off and remove the single pins later.

separate CAT jack, without using the USB cable #ubitx #cat #raduino #arduino

Sascha Bohnet | DL5SMB
 

Hello everybody,

can anybody tell me, if it is possible to realize / install a separate cat jack without using the present USB port,
by going straight to Pin 1, Pin 2 and Ground on the Arduino Nano?

If I have understood correctly the built in cat interface  in KD8CECs firmware uses the USB connector

just as an RS232/TTL converter

Am i right, if I assume, that it should be possible to solder some wires to D0 and D1 (RX + TX) and ground and then install

a MINI-DIN 8 socket to the uBITX like in an FT817?

I am asking because I am building TF3LJs Magnetic Loop Controller https://sites.google.com/site/lofturj/to-automatically-tune-a-magnetic-loop-antenna at

the moment, which communicates with the tranceiver via cat for tuning the antenna. This interface uses just these three lines. So I need to make them talk :-)

I would just try it, but am a little bit unsure if i might damage something, if I am wrong. I am not really fond of grilling the Raduino.

Sascha

Built V4 uBitx for sale

chuckr@hostu.org
 

For Sale: HFSignals uBitx V4 bult transceiver. Has KD8CEC V 1.1 software and Nextion 3.5 screen. In custom case with speaker and cooling fan for finals.
Mods: Moved 5 volt regulator to case, also has second 5 volt regular to the 12 volt fan, quite running and keeps finals cool. Power out varies a small amount from 14 watts at 3.7mhz, 10 at 7.2mhz, 12 at 14.2mhz etc. Second arduino for Sig meter etc. and 4 spare finals included. Will post pics on ( http://hostu.org/ubitx ) just click on each pic. Will accept best reasonable offer. Shipping will be added based on your zip and payment will be by paypal only. Please note the board has a minior repair from bad bias pot and both bias pots and finals have been replaced. Unit is is working order (ssb needs work adjustments ] but you will need to do some final finishing work and adjustment yourself. When making an offer please know you will need to replace the 3.5 in. Nextion Enhanced Screen as there is a crack near the top ( 24.99 at banggood ). It does not stopping the radio from working but does interfere with some menu functions. Cat connection works ok for some basic needs. Questions and offers to ubitx@...    paypal email sales@....

bangood link for nextion screen     https://www.banggood.com/3_5-Inch-Nextion-Enhanced-HMI-Intelligent-Smart-USART-UART-Serial-Touch-TFT-LCD-Module-Display-Panel-p-1188732.html?rmmds=search&cur_warehouse=CN

Re: Built V4 uBitx for sale

chuckr@hostu.org
 

pics and email     ubitx at hostu.org         and   paypal add      sales at hostu.org

Re: Complainers?

Brian L. Davis
 

http://www.kitsandparts.com/index.php
If you look at a specific torroid you will find that you can select the value you want and it will tell you how many turns and the approximate length of wire needed.  Sounds like what you would like to see.

73,
Brian, WA5RDG

Re: LPF kit for ubitx v3

Mike Short
 

Break them up and remove pins one at a time. They are too cheap to risk lifted runs, etc on the board.

Re: Complainers?

M0OOZ
 

Very useful webpage - I use this all the time. It also gives you the Z @ any particular frequency

73
Geoffrey David Cowne M0OOZ


On Sun, 10 Feb 2019 at 22:40, Brian L. Davis <brianldavis@...> wrote:
http://www.kitsandparts.com/index.php
If you look at a specific torroid you will find that you can select the value you want and it will tell you how many turns and the approximate length of wire needed.  Sounds like what you would like to see.

73,
Brian, WA5RDG

Re: Tuning clicks on bitx40 #bitx40help

Billy Shepherd <dis60cd@...>
 

Any luck? I’m using probably the same kit and the clicks are extremely annoying. 

Re: uBitx V4 Audio extremely quiet and other needed mods#ubitx

alphamale@...
 

Ok, so we got the rig on a service monitor this weekend.. After using the service monitor to align the radio (the procedure used from the hfsignals website did get it close, and the one suggested by Evan got even closer) I was able to inject a signal at 29.7 MHz and at 1.0 MHz and using a audio spectrum analyzer on the output from the ubitx I was able to fine tune the alignment so that a 1KHz test tone put into the injected signal came out of the ubitx as a 1KHz tone, at the exact dial frequency of the signal. Evan's alignment procedure did get me within about 500 on the number needed for the BFO setting to accomplish this, so thanks for that Evan.

Here is what I found on the service monitor:
With a signal input of -45 dbm, the ubitx has plenty of audio, and can actually overdrive the audio amplifier chain if turned up too much. -45 dbm is equivalent of 30db over S9, or S9+30 signal. This is close to what we get from the AM radio station that is only about 4 miles away, volume from the test signal and the radio station are about the same at this level.

With a signal input of -70 dbm the ubitx made enough audio with the volume turned clear up that we could hear the test tone, but it was quiet. -70 dbm should be an S9 signal of 50 uV, so I would have expected much louder signal. It was, however a very clear signal.

With an input of -100dbm (around S4 on the scale, or 1.6 uV) the signal was present, but barely audible to our ears.

With an input of -120 dbm (0.2uV or S1 on the scale) we could not hear the signal out of the speaker, however the spectrum analyzer could still detect it's presence.

My Conclusion: The ubitx has a very sensitive receiver, and it works very well even at the lower signal input levels, but the amount of amplification in the AF stage is inadequate if the signal is below about S7 in strength.

We tested on four different V4 ubitx boards that were built within the last week, and got the same results on three of the four. The fourth one was just a little louder than the other three, not much, but enough we could tell a difference.

Ashhar, hopefully this extra information is helpful to you. Do my boards appear to be operating properly, in which case we may just need to add an audio amplifier and AGC circuit to make them easier to use, or does it look like these are not functioning as designed? Do these results look similar to what others are seeing with this board? For what it is worth, the V3 board one of our guys has is about 2 to 3 times louder than any of the V4 boards.

I am not opposed to adding an audio amplifier if that is the correct solution to the perceived problem with the audio, but I would like to know that it is the best course of action before I proceed. I dislike fixing problems with a tourniquet when a bandage would have sufficed, if you know what I mean.

Thank you everyone for the kind assistance you have offered here.

Erik Larson - AD7OV

Winding toroids

 

Hi,

I've found the calculator on toroids.info to be very accurate -- so much that I rarely measure after winding anymore.  They  quote a quite generous length of wire to use (even considering the 1" leads) so I usually subtract an inch or so.

No need to re-wind if you loose count. As long as you have a cell phone or other digital camera, just take a picture and then zoom in on it.  It becomes very easy to count if you do that.

How I wind: first put the wire through the center, gather the ends, and pull them taut.  Now wind one half of the windings, and then the other.  This way you only have to deal with one half the length of wire at a time (instead of threading the entire length through for the beginning turns).

73,


Mark -- N7EKU/VE3

Re: Spurs/Harmonics fixes for v4 based on v5 board design?

Evan Hand
 

Going back to a previous topic: tools to check on uBitx emissions

I finally had time this past weekend to do some more playing with the SDRPlay RSP2 and the uBitx.  After a lot of testing in trying to clear up my confusion on why my step attenuator that I bought did not step down the RSP2 measurements correctly, I ultimately worked out that there is compression of the signal probably caused by the AGC function of the RSP2, or the software.  When I kept the signal below -55 DBm, a step change in the attenuator matched a change in the measured signal.  As I got closer to the -55 DBm level, the step decreased.  I then checked against my RF Explorer and verified that the RSP2 was not reporting accurately unless the input was below the -55 DBm.

I then went on to check the harmonics on CW using both the RF Explorer and the RSP2: again, as long as the input was below -55 DBm for the RSP2, the results matched.  I then went on to test the rig on SSB trying to use my two tone generator that I built from an article by DK7IH (was posted prior in this thread).  Did not work as expected, as I could not get clear two frequency spikes on the RSP2.  I then ran a number of tests on the generator, and found that the tones were not the same as the ARRL standard, and that there were a lot of "extra" tones depending on the balance/level setting.  Final result of the testing is that the rig is not compliant on CW, however it IS compliant for 40 meters SSB.  Will go on to test the rest of the bands next weekend.

Turns out that the tone generator software that runs on a PC has a very clean signal, at least from my backup laptop.  Tested it through the free audio spectrum analyzer listed prior as well, and was able to set the 700 and 1700 hz tones that did not have any other garbage.  Built a cable to connect the output of the laptop to the input on the uBitx with a slide switch to turn on the PTT signal.

All this confirms to me that 
1 - I still need to work on my construction and testing techniques, and more importantly 
2 - need to verify test equipment and procedures regardless of where they come from.
3 - Could not have verified the RSP2 levels without the RF Explorer (needed a third device to break the tie between the step attenuator and the RSP2).

If anyone else is trying the SDRPlay series of SDR radios as a signal analyzer, would you please share your experiences so that we all can learn more?

As always, the above are my interpretations of my experiences, yours may be different.

73
Evan
AC9TU 

Re: Black rectangles - Bitx40 hardware or software problem?

Michael Mitchell <mitchellmichaelh@...>
 

I have 10 years experience in a manufacturing environment using these displays. Don't waste time thinking you can fix the display , how much is your time worth. Just replace it. We had 50 % failure rate with cheap displays. 

Re: uBitx V4 Audio extremely quiet and other needed mods#ubitx

Curt
 

Erik

you can imagine your 4 rigs there, and your nice data gathering, describe the audio output.  I find audio is adequate in headphones - using speakers perhaps greater difference of opinion may abound.  please note that v4 uses a simple pair of transistors for the audio output, perhaps with less max power output than the previous (and upcoming) versions that use an IC.  I confess for CW work I need audio filtering anyway, so I use a NESCAF - that works nicely for SSB also -- this includes a LM386 output stage to drive my headphones.  I guess the speaker isn't finding much use in my operating. 

BTW I installed the sidetone mod described at the K3PZN website.  This one is configured to route such that it isn't impacted by the volume setting.  its a cut trace, a 1meg resistor in my case and a piece of wire. 

If your builders want more robust audio inside the box - I am suspicious a search here will provide some ideas.  Also check ubitx.net to see what is posted, but I find content isn't any better vetted than what is here. 

73 Curt