Date   
Re: Cool cheap oscilloscope for troubleshooting

Robert D. Bowers
 

Good suggestion.  I prefer analog to digital for RF work anyway - I feel you can 'see' more with it.  There sometimes is a learning curve to using a digitizer.

The AD8307 suggestion, by the way, is a sound one.  I built one - in an RF tight case, with an arduino programmed to convert the output of the AD8307 to USB output.  You have to REALLY isolate the 8307 from the arduino, otherwise it looses a lot of sensitivity, but if done right is a fantastic tool to use.  I use it as a building block combined with other homebrew equipment (such as a programmable signal source) for doing all sorts of measurements.

Bob

On 7/30/19 11:11 AM, Ashhar Farhan wrote:
The oscilloscope is a very useful tool. But you will need something that goes upto at least 50 Mhz. Dont invest in anything less than 20 Mhz. A second hand tek from ebay will be a good bet.
Alternatively, you can build an AD8307 based power meter. This can cost less than ten dollars and measures power upto 500 mhz.
- f

On Tue 30 Jul, 2019, 5:56 PM Don--AE4DW, <dwinflorida@...> wrote:
Another good cheap option is the the DSO150 from JYETech. They come in varying kit forms, and are a cheap useful little scope. You have to be careful with the JYETech series as there are all kinds of clones with pirated firmware, so if you go this route, make sure it is actually from JYETech.

It will never be mistaken for a good lab grade Tektronix scope, but will suffice for quick and dirty troubleshooting.

https://jyetech.com/

Re: Wiring Instructions for BITX40 v. 3

Vince Vielhaber
 

Oops! Ignore that. I thought you were asking about a uBitx, even tho it's in the subject!

Vince.

On 07/29/2019 09:06 PM, Vince Vielhaber wrote:
The wiring diagram is on hfsignals.com. It's the same for the v5 as the
v3.

Vince.



On 07/29/2019 09:04 PM, Clark WU4B wrote:
Travel with me back in time...to 2016. I purchased a BITX40 v.3 without
the Raduino. Now I am unable to find the simple wiring diagram I though
came with it.

I've just spent about an hour searching the Files and cannot seem to
locate it. Any help would be greatly appreciated.
--
72,

Clark WU4B
QRPARCI # 10815

Re: Replacing firmware Ubitx V5 problems

Gary Anderson
 

Herman,
Xloader is a GUI wrapper program around avrdude.  In the folder where you have installed Xloader, check that the "devices.txt" has the correct Nano listed as an option.

Use your favorite text editor, or from a command tool in that working directory >type devices.txt

Example:
c:\Arduino\XLoader>type devices.txt
Mega(ATMEGA1280);m1280;stk500;57600;
Duemilanove/Nano(ATmega328);m328p;stk500;57600;
Duemilanove/Nano(ATmega168);m168;stk500;19200;
Uno(ATmega328);m328p;stk500;115200;
Mega(ATMEGA2560);atmega2560;stk500v2;115200;

I'm just guessing the that Xloader package you downloaded wasn't set up for a Nano;
Which may also very well mean that the avrdude.conf file in that working directory is also not correct for your needs.

try this Xloader package that is set-up for Nano.
http://www.hobbytronics.co.uk/download/XLoader.zip

Webpage for this:
http://www.hobbytronics.co.uk/arduino-xloader

I've personally never used Xloader.

Regards,
Gary


Re: Wiring Instructions for BITX40 v. 3

Jerry Gaffke
 


A primary attraction of the Bitx stuff is that it is old school analog using mostly discrete transistors.
You can get in there with a probe and see exactly what is going on, a good learning platform.
Cheap enough that it's not a major disaster if your probe shorts something out.

Here's some notes from somebody who created a stable offboard analog VFO
to go with his pre-Raduino Bitx40:
    http://soldersmoke.blogspot.com/2016/10/hacking-hackable-bitx-40-module-vfo-is.html

As Sarma mentioned, there have been several kits of "new improved" Raduino's offered 
here in the forum over the last couple years, though the original Raduino works fine.
HFSignals was selling the Raduino alone for about $30, send email to "hfsignals at gmail dot com" if interested.
Or spend an extra $30 and get that Raduino along with a spare Bitx40 board.

If you go for a digital VFO, I suggest you stick with a Raduino or Raduino compatible.
so you can move up to Allard's firmware.
Use either Allard's v1 firmware for minimal hardware mods, or v2 for more features:
    https://github.com/amunters

For those into the history of the Bitx40, here's a few links to earlier versions built by Farhan:
    http://www.phonestack.com/farhan/bitx.html
    https://amoghdesai.com/technology/electronics/hfi-2014-bitx40-design-everything-you-want-to-know/
Note that neither of the above include a power amp.
Farhan encourages others to build this stuff, develop it further, sell it if they wish.
There were several versions of the Bitx sold as kits, though hfsignals.com is now
where most of us would get a Bitx.  Here's a few examples chosen at random:
    https://www.qrpkits.com/bitx20a.html
    https://www.radiobrewery.com/Bitx-3c-40m-20m-HF-Radio-PCB-Kit
    https://amateurradiokits.in/product/bitx-multiband-exiter-board/

Here's an early attempt at a multiband Bitx, it never did work very well:
    http://www.phonestack.com/farhan/minima.html
Primary problem was that the minima tried to get by with a single IF stage,
making it difficult to get sufficient image rejection.
The uBitx learned from that, went with a dual conversion scheme.

Jerry, KE7ER




On Tue, Jul 30, 2019 at 05:16 AM, Clark WU4B wrote:
Thanks to all who replied and also to Jerry on a little bit of history.  It wasn’t clear to me what I would use in place of Raduino which I don’t have.  

Re: Replacing firmware Ubitx V5 problems

Herman Scheper
 

Gary, many tnx for your light in the dark. I usedthe from hobbytronics.

I try to load the cec firmware with a size of the hex file from 85 kb.

The load stops after 30630 bytes uploaded. An that is all.

No new reboot; nothing more.   Switching off and on : no starting ubitx.

Now first find the original v5.1 hex file to bring it back to original.

First bringing back to original with 5.1 hex file..

But we will succeed one day!  Herman paobab

Herman vanaf z'n IPad.

Op 30 jul. 2019 om 19:01 heeft Gary Anderson <gary.ag5tx@...> het volgende geschreven:

Herman,
Xloader is a GUI wrapper program around avrdude.  In the folder where you have installed Xloader, check that the "devices.txt" has the correct Nano listed as an option.

Use your favorite text editor, or from a command tool in that working directory >type devices.txt

Example:
c:\Arduino\XLoader>type devices.txt
Mega(ATMEGA1280);m1280;stk500;57600;
Duemilanove/Nano(ATmega328);m328p;stk500;57600;
Duemilanove/Nano(ATmega168);m168;stk500;19200;
Uno(ATmega328);m328p;stk500;115200;
Mega(ATMEGA2560);atmega2560;stk500v2;115200;

I'm just guessing the that Xloader package you downloaded wasn't set up for a Nano;
Which may also very well mean that the avrdude.conf file in that working directory is also not correct for your needs.

try this Xloader package that is set-up for Nano.
http://www.hobbytronics.co.uk/download/XLoader.zip

Webpage for this:
http://www.hobbytronics.co.uk/arduino-xloader

I've personally never used Xloader.

Regards,
Gary


uBITX v5 Calibration Using Test Equipment #v5 #calibration

Doug Hall
 

Hi all,
I just got my v5 board wired up and working. I'm using KD8CEC v1.2 firmware and things seem to be working pretty well. I have an AGC board to install but haven't gotten around to it. My first QSO from here in NC was with CE2LR on 20M CW. Haven't measured power output, haven't really measured anything other than current draw.

Instructions for doing the BFO calibration for SSB and CW seemed a bit vague, and given that I have some decent test equipment (spectrum analyzer w/tracking generator, VNA, scope, etc.) I was wondering if there was a more "exact" way to do the alignment for those who have the test equipment. I have not studied the schematic yet, so I guess that's next. But if someone else has already figured out a procedure for alignment using test equipment I'd sure appreciate hearing about it.

Meanwhile I'm really enjoying the radio.

73,
Doug K4DSP

Re: uBITX v5 Calibration Using Test Equipment #v5 #calibration

Adrian Chadd
 

I did mine by using an audio spectrum analyser and a noise source (ie,
my QTH.) Once I had tuned the VFO up "enough" using my test kit and
frequency counter I calibrated the BFO oscillator by looking at the
spectrum on the audio output and attempted to keep the noise in a
300->2300KHz passband. You will see the noise passband move as you
change the BFO calibration.

Then I re-checked the VFO calibration again against WWV and everything
sounded OK.


-adrian
(kk6vqk)

On Tue, 30 Jul 2019 at 13:12, Doug Hall <k4dsp.doug@...> wrote:

Hi all,
I just got my v5 board wired up and working. I'm using KD8CEC v1.2 firmware and things seem to be working pretty well. I have an AGC board to install but haven't gotten around to it. My first QSO from here in NC was with CE2LR on 20M CW. Haven't measured power output, haven't really measured anything other than current draw.

Instructions for doing the BFO calibration for SSB and CW seemed a bit vague, and given that I have some decent test equipment (spectrum analyzer w/tracking generator, VNA, scope, etc.) I was wondering if there was a more "exact" way to do the alignment for those who have the test equipment. I have not studied the schematic yet, so I guess that's next. But if someone else has already figured out a procedure for alignment using test equipment I'd sure appreciate hearing about it.

Meanwhile I'm really enjoying the radio.

73,
Doug K4DSP

Issues with ordering the BITX40

dk3ts@...
 

It appears that the link for ordering a BITX40 on the HF Signals web site is broken. Clicking add to cart takes you to a generic Pay Pal page with no way to order.
Is there another way to order a BITX40?

Re: Cool cheap oscilloscope for troubleshooting

Graham W
 

The links you provided are full of Malware !!! I have to re-do my windows 10 machine because of the malware.....
Please use caution on clicking links....

Graham VE3WGW

Re: FS: QRP Gear

 

HT20 Sold pending funds
Soda Pop II still up
TNC still up accepting offers
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: FS: QRP Gear

MadRadioModder
 

Oh ok I get it… you got your own flea market going on the uBITx reflector.  Great didn’t know we could do that.  I got lots of stuff to sell…

 

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of N8DAH
Sent: Tuesday, July 30, 2019 7:01 PM
To: BITX20@groups.io
Subject: Re: [BITX20] FS: QRP Gear

 

HT20 Sold pending funds
Soda Pop II still up
TNC still up accepting offers
--
David

 N8DAH
Kit-Projects.com

Shop is open!


Virus-free. www.avg.com

--

…_. _._

Re: bitx and ubitx encoder replace ment

Alf Baranda
 

Thanks Robert, as soon as I have a little time I will try.
I've been thinking about it for a long time.
The truth is that I don't like dials with retention.
 
 

Re: FS: QRP Gear

 

People sell qrp gear here from time to time. I am in a pinch and need to sell some gear. I didn't realize this was news or you took personal offense....
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: FS: QRP Gear

 

Soda Pop II sold
--
David

 N8DAH
Kit-Projects.com

Shop is open!

Re: Replacing firmware Ubitx V5 problems

Gary Anderson
 

Herman,
"30630 bytes uploaded" OK!
30630 looks correct for "UBITXV5_CEC_V1.122_NX_S.hex"  
:0A779C00732C207365742000220096  last ten (OA) bytes are loaded at address 0x779C
this is an intelHEX file, Not a binary file.  File size will not match bytes uploaded.

It is unclear where you are in uBITX modifications.  I did see that you own an enhanced Nextion.
I suggest starting with the factory LCD display installed and test that you can successfully upload the CEC firmware that matches the factory supplied display. 
I believe it is UBITXV5_CEC_V1.122_16P (for a single 1604 display via the Parallel interface)

Regards,
Gary

Re: Cool cheap oscilloscope for troubleshooting

Tom, wb6b
 

On Tue, Jul 30, 2019 at 08:12 AM, Ashhar Farhan wrote:
AD8307 based power meter
That is a good idea. I have some eBay boards with the AD8307 and similar chips already. Should be better than a diode and capacitor RF probe.

The advantage of the tiny scope over a DVM, even if its bandwidth is only 1 Mhz, is in many places I may be probing in the SSB HF transceiver the signal will be envelopes modulated by the audio rather than steady state. The little oscilloscope will let me see the shape of the envelopes. The DVM will not. 

Sorry to the person that got malware. I've repeatedly clicked on those links, as well as when I went to the sites originally and have not had any malware issues with the links or when I originally visited the sites. But never know, the sites could have had a short term issue with being hacked and the sites fixing the issue. I assume if there was an issue it only affected one of them. You did not specify which one to be careful about. 

Tom, wb6b

Re: Issues with ordering the BITX40

MVS Sarma
 

Instead, you cN buy a ubitx v5 itself.cost difference is not much.and you get latest design. Use only 40 as you needed

Sarma vu3zmv

On Wed, 31 Jul 2019, 4:57 am , <dk3ts@...> wrote:
It appears that the link for ordering a BITX40 on the HF Signals web site is broken. Clicking add to cart takes you to a generic Pay Pal page with no way to order.
Is there another way to order a BITX40?

Re: uBITx V5 Stuck in Transmit #ubitx

Yusuf A
 

Hey everyone,

i have the same issue, but i cant find my short? at which point were your solder blobs?

Re: uBITx V5 Stuck in Transmit #ubitx

MVS Sarma
 

is it a new one or working one.
 If new, please ensure that the KEY wire has 4.7K resistor from Vcc.
If working
 , please give a gentle TAP on relay K1 . If Stuck, it would release.
 Perhaps you may need to change it.

All the best

sarma vu3zmv


On Wed, Jul 31, 2019 at 12:36 PM Yusuf A <bizim.yusuf@...> wrote:
Hey everyone,

i have the same issue, but i cant find my short? at which point were your solder blobs?

Re: uBITx V5 Stuck in Transmit #ubitx

Yusuf A
 

it a new one. it used to work very fine in a 3d printed case. after the instalation in a new case from sunil with the pcb frontpanel i am having this issue,
The 4.7K resistor is installed. i will check the K1 relay later. thanks so far