Date   

Re: For Sale: BITX40 and µBITX

Bob Fischer, Fischer Technical Services
 

What version is the uBITX?


From: "W8TEE via Groups.Io Jack" <jjpurdum@...>
To: BITX20@groups.io
Sent: Saturday, September 28, 2019 11:57:22 AM
Subject: [BITX20] For Sale: BITX40 and µBITX

All:

I have two unbuilt kits: one for a BITX40 and one for a µBITX. The list on the BITX40 is $70 and the µBITX is $140 (with shipping). Both are in their original shipping boxes and are as shipped from India. I'm asking $50 for the BIX40 and $110 for the µBITX. Shipping is $8 for the lower 48 states for either unit. If someone buys both units for $160, I'll pay the shipping and add a free JackAl board for the µBITX. This is a $50 value and enables you to add all kinds of new features to the µBITX. This is what the main JackAl display screen looks like:



You can get more details and manuals on JackAl at the QRPGuys.com web site. This is a first-come-first-served basis. Write me privately at econjack at yahoo.com.

Jack, W8TEE


--
Jack, W8TEE


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

Bill Lamm
 

Fuses are easier to get then raduinos..  I put 0.5 and 3 amp fuses on my uBITX


I need local help

k2tgw@...
 

 
I have a uBITX HF rig but I now only get a "HUMMMM". I think I put DC power
in reversed. My tired old eyes prevent me from doing more. I did not build
it. Is there some one in the New York metro area who could help me ?
     Les,  K2TGW


For Sale: BITX40 and µBITX

Jack, W8TEE
 

All:

I have two unbuilt kits: one for a BITX40 and one for a µBITX. The list on the BITX40 is $70 and the µBITX is $140 (with shipping). Both are in their original shipping boxes and are as shipped from India. I'm asking $50 for the BIX40 and $110 for the µBITX. Shipping is $8 for the lower 48 states for either unit. If someone buys both units for $160, I'll pay the shipping and add a free JackAl board for the µBITX. This is a $50 value and enables you to add all kinds of new features to the µBITX. This is what the main JackAl display screen looks like:



You can get more details and manuals on JackAl at the QRPGuys.com web site. This is a first-come-first-served basis. Write me privately at econjack at yahoo.com.

Jack, W8TEE


--
Jack, W8TEE


Did something break, and what should I check?

riz-qcx@...
 

I'd been having some trouble receiving SSB signals on my µBITX that my old Grundig YB400PE receiver was picking up (My QTH is really radio-noisy.  Really, really noisy. I'm right next to a freeway and across a hospital in San Francisco), so I've mostly started experimenting with digital modes while I learn the quirks of the v5 µBITX (and the CEC 1.200 firmware I put on it) before moving on to some antenna improvement work.   I'd made a few successful tests and my first contact (FT8) on the µBITX a couple days ago using audible connections (meaning, "Play the audio out of the speaker into the computer's mic, and hold the radio mic over the computer's output") on 20m.

So yesterday, I finally got all the connections I needed (and time to fiddle) to connect the radio properly via a USB audio input.  Hooray!  I made a few actual contacts, and my signal was definitely getting out according to pskreporter.info .  I then started playing with WSPR (using WSJT-X).  I was getting out pretty wide  (spots from over 11000km away!  wow.), but  I never actually *received* any WSPR transmissions.  Huh.  (To be clear, I was able to receive FT8, though it felt like others could hear me better than I could hear them)  I didn't think too much of it - never played with WSPR before yesterday, and I'm definitely still learning how it should behave.  Before turning in for the night, I set things so WSPR was transmitting and receiving so I could learn a little more in the morning.  This morning, however, no new spots all night.  None, when I had been getting a bunch earlier.  Hmm.

The µBITX seems to definitely be transmitting - it draws from 15-19 watts when doing so (same as when it was "working"), and I can hear myself on the Grunding YB400PE when transmitting into a dummy load, and I hear the FT8 I've been trying to transmit this morning.  To my ear, however, the signal sounds... weird.  The FT8 sounds are not as sine-wave-y as I'd expect, and my voice on the SSB tests seem a little muddy.   The antenna is still connected (first thing I checked), so I'm at a loss why I was getting such good reports yesterday and NONE overnight and today.   Does anyone have any suggestions of tests to do to isolate a specific problem?  I have multimeters, an oscilloscope, and a function generator, but not much else in the way of test gear.  Halp!

This was going to be my first actual weekend of playing with this radio - I'd love any suggestions to help me salvage it!

Thanks,
+j
AJ6IY


Re: Swapping Nano's

hickmodawg@...
 

Excellent.
 

Thanks for the great info, Evan.  I'll have a try at this.  I appreciate all the help here.

 

Does anyone know precisely the characters I need to change to the CEC Firmware v. 1.2 so it will work with my Ver. 5 board with the stock screen that came with the kit?

 

73,

Martin, AJ6CL


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

DD5ET
 

@Curt: Yeah, two fuses is probably overkill in my case. I don't anticipate running the PA at a higher voltage, but you never know. I've already cut the holes in my case for two fuse holders, though, and I've got plenty of fuse holders, so I might as well. 


Re: GOT IT WORKING corrected V2 file...Calibration #calibration

d.maccallum@...
 

I some of you math wizards need to fix up my calibration calculator.
I think my error was on the high side and I got lucky with the right numbers out of it to get my rig running.
Got to do sum abs addition or subtraction depending if the MBITX tx is high or low.
I think getting this spreadsheet calibration calculator working right would help the group out by taking the guess work out of the equation.

HELP math expert need here so we can do it by the numbers.............

Have Fun
Dave N8KZ
 


Re: GOT IT WORKING corrected V2 file...Calibration #calibration

d.maccallum@...
 

Corrected MBITX V2 the one that worked...attached..

Dave N8KZ


Re: GOT IT WORKING...Calibration #calibration

d.maccallum@...
 

Hello I just got my MXITx calibrated my calibration calculator needed to be changed so the tone is removed from the equation.

I am using my KX2 for my received measurement from the MBITX TX. Make sure that the measurement receiver cw tone is the same as the MBITX cw tone.

The calibration calculator has been fix and works great. See attached file. Use it to figure out what the MBITX  calibration number need to be set to using the memory manager program and your radio freq should be good

Now my MBITX displayed freq. tracks my KX2 displayed freq readings.

Dave N8KZ


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

Curt
 

Thanks, I get it now a second layer or protection. As mine has been turned on over 100 times safely, perhaps this is more needed when PA is used at a higher voltage?


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

DD5ET
 

@Mark: Ok. Thanks. I kind of suspected it was a typo. Five amps sounded a bit out of place for the +12V line given that 2-3 amps is recommended for the PA PWR line.

Now, about that diode... :-)


Bitx40 band pass filter

Brian
 

Like many in the group I have recently got a new toy - the NanoVNA. As part of my learning curve in how to use a VNA I have been looking at the Bitx40 band pass filter. Attached is the result. I had not expected to find 14dB loss but I guess that is the result of thin wire, small cores. The shape of the response compares well with the predicted plot in the Bitx40 Circuit Description page on hfsignals.com.
73 Brian VK4BAP


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

 

My own correction :-p  "edits" not "ends"

73,


Mark


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

 

Hi,

In the original (lower resolution) wiring diagram on the wiki ubitx assembly page, and on the higher resolution one I uploaded (I didn't make any ends, I just increased the resolution), the mainboard fuse was specified as 0.5 amps.

Seems that somewhere along the line in Adrian's edits of the wiring diagram, he accidentally changed it to 5 amps.  Can you change that back Adrian?

73,


Mark.


Re: Swapping Nano's

Evan Hand
 

To answer your second question first, yes you can use a second Nano to program and keep the first as originally received.  There are issues that need to be taken into consideration.
1 - The calibration data is stored on the eeprom of the Nano, which is not saved in the CEC software.  You will need to calibrate before it will work correctly, especially the BFO setting. 
2 - The CEC software is different for each display, and the original software only works with the original display.  That would mean that you need to change the Nano AND the display if you do not use the original display version of the CEC software

The first question depends on what you want for a display?  I have the 3.2" that Dr Lee had already created a full screen tft file with the link from the web page.  That is what I would use.  This is a personal choice.  If you want bigger, then you will need to find the correct tft file to match your display.  2.4 and 3.2 I believe are the two that Dr. Lee has programmed.

You do not need to compile the code if you use the correct hex file.  Use the uBITXV5 directory and read the FileNameInfo.txt file to help select the correct hex file to load into the Nano.  You will need the Hexloader program to go that route.  I believe that this is where I got the version that worked for me:
https://sourceforge.net/projects/hex-file-loader/


Incase you did not get it, here is the link to the Git Hub repository zip file:  

https://github.com/phdlee/ubitx/releases/download/v1.20/uBITX_CEC_V1.200.zip

This should get you started.

For the calibration process, I would do a search on this site to learn the how to do it.  NOTE that the CEC software does not use the same method as the stock (it does not turn on the transmitter to zerobeat wit another receiver.  For the CEC firmware I would download the Memory Manager that Dr. Lee has created to make the adjustments and save the values after a change to be able to backtrack if something goes wrong.

For the BFO calibration I prefer to use a PC based free audio spectrum analyzer that can be downloaded from here:
http://www.techmind.org/audio/specanaly.html

I connected a mic to the input of my PC, tuned the uBITX to an open frequency with just static, and adjusted the BFO to center the noise spectra between 500 and 2500 Hz.  I then went back and re-calibrated the maser clock, then back to the BFO for a final time.

The above is what worked for me.  I cannot guarantee that it will for everyone.  I would suggest that you do the search on this sit as stated above.

The above is free advice; it is worth only what you can make of it, and should be checked as well as you can.

Use at your own risk.
73
Evan
AC9TU


Re: uBITX +12V Fuse: 0.5 amp or 5 amp? #ubitx

DD5ET
 

@Curt: I'm fine with the 2 amp fuse on the PA PWR line. My question is about the "5 amp" fuse on the +12V line as shown in the wiring diagram I described. As I said before, I was just curious about whether it was a typo (and should, in fact, be 0.5 amps) or whether they really meant 5 amps. I haven't seen anyone recommend a 5 amp fuse on the +12V line anywhere else; only a 0.5 amp fuse. So, I'm inclined to think it might be a typo. If it's a typo, it should probably be fixed.


Re: uBITX full design

Lawrence Galea
 

The inductance of the strip together with its capacitance to the board could have formed a series resonant circuit shorting your RF.


On Fri, Sep 27, 2019 at 5:27 PM Jonathan Kayne, KM4CFT <jzkmath@...> wrote:
Thanks for all the information regarding the building of the uBITX. I am more so curious about how the RF trace layout was done. I previously built the mcHF to master SMD soldering, and I found that one of the bands didn't work because RF wasn't going through a trace for some reason. I had to solder a piece of wire to fix it. What it essentially meant is that trace layout on a PCB is a little more complex with RF.
Also, it would give me more KiCad design experience. I mean, my school pays for these types of projects, so personal projects I can go all out really.

Thanks,
-Jonathan, KM4CFT


Swapping Nano's

hickmodawg@...
 

I’m quite new at this, so please be patient.  I haven't done much with Arduinos yet, but I'm learning...

I assembled my uBITx v.5 and it seems to work OK.  I'm quite happy about that!  It has the stock screen that came with the kit and the stock firmware.  I have two questions:

1. Exactly what do I changes in the CEC Firmware v. 1.2 should I make before uploading it in order for it to run properly on my stock Ver.5 uBITX?  I've read Ian's thread from 2 April 2019, but I want to get this exactly right.  I am not sure exactly how to make the changes I need in order to use my stock display or how to tell the firmware I'm using a Ver. 5 Board. in my uBITx. 

Which display do I select and exactly what characters do I delete or add in front of the display's name in order to select it? 

For the my Ver. 5 Board, do I simply type a "5" at the end of the line reading:
"#define UBITX_BOARD_VERSION?"  Is there a space between the "VERSION" and the "5?'

2. I have a spare Arduino Nano.  Can I upload the CEC v. 1.2  firmware to the spare and plug it into the radio and use it, then unplug it and re-insert the original Nano with the stock firmware back in, and use it too?  I mean, can I swap out Arduinos with different Firmware and still expect the radio to perform normally?

 

Thanks,

Martin, AJ6CL


Re: NXP Homebrew RF Design Contest

barry halterman
 

That amp would be of great interest as the mrf101an seems very robust in HF application.
They are not too expensive either!

On Fri, Sep 27, 2019, 3:33 PM w8fgqrp via Groups.Io <w8fgqrp=yahoo.com@groups.io> wrote:
That amp project is exactly something I would love to have in my Shack!  
Love to hear more on this! 

73 de Seth - W8FG 


Sent from Yahoo Mail for iPad

On Friday, September 27, 2019, 3:01 PM, jk.futter@... wrote:

I entered this contest way back in June
Circuit diagram is done for 160m -2m 200 watt PEP 12 volt mobile amp suitable for ubitx ft817 ft818 ic705 etc
still to actually make the amp module but have the ferrites etc for the in / out circuits