Date   
Re: Eureka!

_Dave_ AD0B
 

I must have used up an hour or two trying to break into some pile ups. Worked several stations. It is tough when you are pushing against 100 or 1500 watt stations.

This past week added 40 toroids to my shack and radio connections. Trying to mitigate noise. I suppose most is received side noise, but it can't hurt I figure on the tx side either.

Gary Have you been making any contacts with your radio?

Re: Clone Raduino ?

Tomasz <tomaszblazej@...>
 

That's what I did. In the end, maybe it will work ... Thank You.

Tom
SQ6BBN

Re: New software CEC v1.2 #bitx20

Laurence Oberman
 

By the way in your case would keep going with what you have.
No need to upgrade right now.
Regards
Laurence

On Wed, Apr 3, 2019, 7:31 AM Laurence Oberman <oberman.l@...> wrote:
Kelly
Ian has combined the code changes into one source tree such that by choosing the required version you build the correct hex file for that ubitx version.

I will build it later using all 3 flags and name the hex file appropriately and share.
Regards
Laurence

On Wed, Apr 3, 2019, 5:19 AM Kelly Mabry <kmabry2007@...> wrote:
"Ian KD8CEC has released his latest firmware.  This requires a minor configuration flag to be set to your µBITx version (3, 4 or 5) in the sketch before compiling and uploading the code to your µBITx."

What is this flag I need to set? I thought I could just use xloader to upload hex files.... I have to compile it now?  Confused..

73,
Kelly K5AID 

Re: New software CEC v1.2 #bitx20

Laurence Oberman
 

Kelly
Ian has combined the code changes into one source tree such that by choosing the required version you build the correct hex file for that ubitx version.

I will build it later using all 3 flags and name the hex file appropriately and share.
Regards
Laurence

On Wed, Apr 3, 2019, 5:19 AM Kelly Mabry <kmabry2007@...> wrote:
"Ian KD8CEC has released his latest firmware.  This requires a minor configuration flag to be set to your µBITx version (3, 4 or 5) in the sketch before compiling and uploading the code to your µBITx."

What is this flag I need to set? I thought I could just use xloader to upload hex files.... I have to compile it now?  Confused..

73,
Kelly K5AID 

New software CEC v1.2 #bitx20

Kelly Mabry
 

"Ian KD8CEC has released his latest firmware.  This requires a minor configuration flag to be set to your µBITx version (3, 4 or 5) in the sketch before compiling and uploading the code to your µBITx."

What is this flag I need to set? I thought I could just use xloader to upload hex files.... I have to compile it now?  Confused..

73,
Kelly K5AID 

Re: 2N2222A getting super hot

Tom, wb6b
 

Hi,

Here is a really fascinating (at least to me) old documentary on the rise of Japanese transistor industry. The interesting thing is how the various types of transistors that were important (Point contact, Mesa) in the vintage ARRL Handbook chapter were really just stepping stones and have faded away to more reliable and mass producible modern transistor types.

Also, provides an insight to the past and an engineering culture that existed in a not too far past world. Not just in Japan but much of the world.  

https://www.youtube.com/watch?v=ihkRwArnc1k

Tom, wb6b

Re: Antuino

Ashhar Farhan
 

rob,
i am working on an upgraded version with new software. the new version uses 128x64 graphics LCD screen and it works in three modes : SNA, SWR and Measurement Rx. I will complete the software and push it to github.com.

- f

On Wed, Apr 3, 2019 at 12:19 AM Rob Bleumer <Bleumer@...> wrote:
Hi Asshar,
A few weeks ago I asked you about the schematics of the Antuino and some problems with the vallue of some components.
As you wrote, I waited becouse of some improvements you were working on.
Untill now I did not see any new messages ( I think ).
Can you give us an update of the project?

Rob PA0RBL

Things to get my v4 board behaving better-er..

Adrian Chadd
 

hi!

Firstly, thanks for everyone who has gone and dug into this stuff before me. I'm actually glad the radio is working now. Yeah, input and output filtering is next!

Here's some stuff I found I had to do to the v4 board to get it to behave better-er.

* it's now putting out CW between 5 and 10w on all bands - i had to adjust RV1 /and/ do a proper BFO/VFO alignment to get it to behave well.
* the mic gain using the stock mic was way, way too low - sub-1W peak output on my scope/analyser. I changed the two resistors mentioned at https://ubitx.net/mod-tx-compression/ to modify the behaviour of the mic amplifier. It now approaches the power limit I see with the CW output.
* the speaker amplifier bias needed changing - I replaced the two bias diodes with a pair of 1n4148 with a drop of around 700mV; the amplifier no longer distorts!
* the CW tone generation is way way too loud to use with the speaker turned up - I added a 50k trimpot between R253 and VOL-H. I may actually go do what Kenwood does with side-tone and feed it into VOL-M so the volume level of the CW side tone is independent of the volume knob.

Thanks!



-adrian

Re: Clone Raduino ?

Snowist
 

I usually get my decent Arduino things from Robodyn store in Aliexpress  http://bit.ly/NanV3
This one has 12 & 16 mhz crystals, unsoldered and micro USB connection. I didn't find that quality Arduino in Amazon or Ebay

Re: Changing direction - ignition noise intractable #bitx40

Wayne Leake
 

 To save money, because I am very limited, I'd use a link from a chain, or maybe a rusty quick link.
 Don't care how it looks, just how it works.
 I have all sorts of odds and ends handy.
 I did splurge and bought a case similar to the ones Sunil sells, but bigger. More space, being as the set of boards I bought take up a bit more space.
 I will measure what I have, and actually make paper cut outs to fit on a sheet of paper with the width and depth drawn on it.
 I did that kind of things many years ago, to figure out how to fit furniture I had into a small bedroom.
 Worked out quite well.
 Anyway, don't know if I'd need an alternator filter with my truck.
 Have only run a dual band, or just a 2 meter rig, and a CB that I used while I was moving.
Comes in a bit handy when you are out of range of much of anyone, as well as repeaters.
  I only recall vaguely getting a bit of alternator whine, maybe in the 70's, but not what vehicle it was.
 I have had a lot of vehicles through the years.
 My current main vehicle is a 1983 Dodge RAM250 pickup.
 And I don't recall hearing any alternator whine from it.
  Wayne WA2YNE
Imperial Texas.

Re: v5 Alive! (plus my advice, and thanks)

 

Hi,

Actually there are three solutions for reducing harmonics -- the missed one is Allison's method of rearranging the relays on the board and moving some traces.  I did this and it reduced harmonics significantly.  On CW it went from 5 out of compliance to 2.  And those two were both the 2nd harmonic which I think could be made compliant if I balanced the biasing of the finals a bit (didn't try that yet).

Also, everyone keeps talking about shielded SMD inductors, but I've yet to see any part number/datasheet that shows these are shielded.  So maybe we should just say "SMD inductors".  It's more likely that it's just their smaller size and thus reduced size of their magnetic field that makes any difference; and anyway, from what I've seen, their use hasn't been tested extensively I think, as I've yet to see any measurements on this change and it's affect on spurs (except maybe Raj?, but I can't find anyone else's).

73,


Mark.

Re: Two Tone Generator #two-tone

 

Hi,

There are many free Android apps that will generate whatever tones you want.

On desktops and laptops, the Linux program "Audacity" is very good for making whatever tones you want too.  It will also do very nice spectrum analysis of audio input from your rig (for viewing filter passband shape so you can set your BFO correctly).

73,


Mark.

Re: Headphone Jack wire up #ubitx

 

Hi,

Yes this will work.  However if you every plug a mono set into the jack it will short out the audio (and this is not always good for the audio chip).

I think an alternate method is to connect the positive audio lead to the tip, and the negative lead to the ring.  Both mono and stereo sets will then work with the jack wired this way.

73,


Mark.

Re: Clone Raduino ?

MVS Sarma
 

No question os another seller. Buy an arduino that is supplied loose with berg  stick pieces supplied loose. It is for us to solder the way we need
All the best
Sarma  vu3zmv

On Wed, 3 Apr 2019, 5:24 am Tomasz <tomaszblazej@... wrote:
Thank you for your careful advice. They are very helpful. I have pins on the wrong side ... I need to find another seller.

Best regards
Tomasz, SQ6BBN

Headphone Jack wire up #ubitx

cf_fizban
 

The hf website instruction show the wire connecting two of the posts but the instructions on this site has it going to just one. If I understand things right connecting both it should allow the mono sound to com out both sides of the headphone. Is this correct? This is my current setup.

Re: Clone Raduino ?

Tomasz <tomaszblazej@...>
 

Thank you for your careful advice. They are very helpful. I have pins on the wrong side ... I need to find another seller.

Best regards
Tomasz, SQ6BBN

Re: v5 Alive! (plus my advice, and thanks)

Curt
 

Ron

nice work - I like your method.  and you have many of us interested in the analog discovery device you are using! 

20m is pretty clean on my stock (and modified) v4.  let's see what you get on say 12m -- it okay if you don't get 5 watts - don't overdrive past where the ubitx output starts to peak, or better yet maybe use the same audio drive level that you used for 20m on each band. 

Curt

Re: Clone Raduino ?

Jerry Gaffke
 

Any vendor that supplies an Arduino Nano with header pins already soldered in place
will have them on the "pin direction wrong" side for our use.  The trick is to buy one without
the pins already soldered down.  To plug the Nano into a Raduino board, we need to have
the pins on the same side as the USB connector.

Blindly plugging in a Nano that has pins on the wrong side
means power and ground got applied to the wrong Nano pins.
Mostly likely destroyed the Nano.

Originally, the Raduino came with the Nano soldered in place, mounted under the LCD display.
There was no room under that LCD display for a socket, which was bad news because
we were seeing a fair number of Nano failures.
The solution was to socket the Nano on the other side of the Raduino board,
out from under the LCD display.    https://groups.io/g/BITX20/message/49986
That change was made when the v4 uBitx came out.

Having the big 12 and 16 mhz crystals as pointed to by Snowist's yellow arrows
is slightly better for v5 in that those quartz crystals are more stable then the 
cheap ceramic resonators found on most $2 Arduino Nano clones.
However, not much of anything in our radio depends on those crystals being accurate,
a CW keyer might be at 20.1 WPM when it claims to be 20 WPM.
(The operating frequency is determined by a 25mhz crystal on the Raduino, not the Nano.)
On v3 and v4 a Nano oscillator that is exactly on frequency can beat with our 12mhz BFO
and create audio tones, so the (most likely) off frequency ceramic resonators are
perhaps preferred.  On v5 the 12mhz BFO was moved to 11.052mhz to completely
avoid those audio beat notes that a few v3 and v4 users reported hearing,
so not an issue there.

Jerry, KE7ER


On Tue, Apr 2, 2019 at 02:51 PM, Snowist wrote:
I will show you anexample. I have 3 different Arduino Nano boards (I use them for experimental purposes)

Re: Stupid Question

Sam Tedesco
 

I found it... thanks!

Re: Stupid Question

Evan Hand