Date   

Buzz on power up and low power

TheRubbersoul1991 .
 

Hi all

I powered up my BitX 40 today and there was a small pop and then a buzz/hum started from the speaker. It's quite loud when the AF gain is cranked.

Also, the dreaded low power hit me again.This time all connections are ok as far as I can tell as I haven't had the radio apart and it worked perfectly last week. I checked the resistance on R141 as a previous post suggested this and it shows 10 ohms exactly. Is this correct?

I have some spare IRF510's. Is there a reading I can take on this?

cheers, Phil, VK8VWA


Re: Looking for NOS or Pull with good leads 130 Ohm 3w

 

Question do you like the COR keying for digi? or CW? I thought about a PTT jack for later. I have a nice Cast alum case with a full surface heatsink I just have to stop being lazy and finish it. Thanks for the pics and ideas. I do plan to add either one 24v fan or 2x 12v.

I am going to homebrew a wspr tx and use a Hardrock Driver set for 500mW in since I can't seem to find it a new home so with 10mW drive I can expect about 100-200mW out.

73

 David


Re: Pelican cases

Vince Vielhaber
 

I stopped at HF this morning and grabbed a couple of these cases. When I got home I did some comparisons to the 1150 Pelican case that I already have. They're only a little smaller than the 1150 but what really surprised me is the panel I made for the 1150 actually fits in these, a little snug but it fits.

Vince.

On 12/21/2017 03:44 PM, Terence Taylor wrote:
Yes, they have a small ledge around the rim. On the small case, it is
about 1/16" and on the large one, is is about 3/16".


On 12/21/2017 12:09 PM, Thomas Noel wrote:
Can anyone confirm whether any of the HF cases have the ledge for a
panel kit?


Allards scan function. #bitx40help

Joshua Bagwell
 

I recently had to replace the nano due to messing up the USB port. When I installed Allards lastest code the scan function no longer works. I programmed it to start at 7100 and end at 7300. It tunes to 7100 and doesn't move. I reverted back to 1.20 and the scan function works fine.


Thank You,
Joshua


Upper Sideband Mod

Ben Piecora
 

What modification do you need to make to make the BITX40 (running 1.27.2) work on UPPER side and FT8(that’s the main purpose) 

Thanks and 73
KD2NOU
--
Ben
KD2NOU


Re: ubitx - Possible to receive 630 meters? #ubitx

Jack, W8TEE
 

That's an "el":
3000000L to 500000L

to denote a long data type. I think it's easier to see if you use a capital 'L'. If you want an unsigned long, use 'UL'.

Jack, W8TEE


From: Ashhar Farhan <farhanbox@...>
To: BITX20@groups.io
Sent: Friday, December 22, 2017 9:32 PM
Subject: Re: [BITX20] ubitx - Possible to receive 630 meters? #ubitx

You will have to fix the firmware to go down that low.download the ubitx sktech from github, change the line that defines LOWEST_FREQ from 3000000l to 500000l. Note the small letter l at the end of the zeros.
- f

On 23 Dec 2017 1:50 am, "M Garza" <mgarza896@...> wrote:
Hi,
I will be putting my ubitx together after Christmas but was curious if it is possible to modify it to receive 630 meters?  
I already plan on building a lpf for 160 meters, so I will build one for 630 meters as well.
Any thoughts or suggestions?

Thanks

Marco - KG5PRT



Re: ubitx - Possible to receive 630 meters? #ubitx

M Garza <mgarza896@...>
 

Thank you Ashhar!

Once I get some results, I will report back.

Marco - KG5PRT 

On Dec 22, 2017 8:32 PM, "Ashhar Farhan" <farhanbox@...> wrote:
You will have to fix the firmware to go down that low.download the ubitx sktech from github, change the line that defines LOWEST_FREQ from 3000000l to 500000l. Note the small letter l at the end of the zeros.
- f

On 23 Dec 2017 1:50 am, "M Garza" <mgarza896@...> wrote:
Hi,
I will be putting my ubitx together after Christmas but was curious if it is possible to modify it to receive 630 meters?  
I already plan on building a lpf for 160 meters, so I will build one for 630 meters as well.
Any thoughts or suggestions?

Thanks

Marco - KG5PRT



wb7dmx

wb7dmx@att.net
 

getting excited already ordered my new microbitix all band transceiver today,
I am very pleased on the work every one is doing on this.
been going all through the files and photoes tonight. can't wait to get it on the air.


Re: CW Key/Keyer/paddle idea

Goran VE6GPO
 

I built something similar to what Andy described here as 'proof of concept', has to hook it up to actual radio yet, picture attached.

Running Allard's 1.25 version, code changes were very minimal. Basically, comment out LiquidCrystal library, and include Adafruit's libraries. Hardware is the easy part, now I have to figure out how to utilize these 'cursor' switches below the LCD for menus etc. And with Adafruit libraries included it uses 25810 bytes, compared to 24440 for Allard's original 1.25. Not a big tax, I think.
/*#include <LiquidCrystal.h>
LiquidCrystal lcd(8, 9, 10, 11, 12, 13);*/
#include <Adafruit_MCP23017.h>
#include <Adafruit_RGBLCDShield.h>
// init the lcd object
Adafruit_RGBLCDShield lcd = Adafruit_RGBLCDShield();
/* defines for RGB LCD background
 *  can be used to indicate different modes of operation
 *  eg. green for Rx, red for Tx, etc. */
#define OFF 0x0
#define RED 0x1
#define GREEN 0x2
#define YELLOW 0x3
#define BLUE 0x4
#define VIOLET 0x5
#define TEAL 0x6
#define WHITE 0x7
 
73, Goran VE6GPO


Re: BitX40 Schematic

Karl Heinz Kremer, K5KHK
 

The download link on this page is broken (because of the move to the new domain), but you can use the two schematics that are shown on that page - just right-click on each image and select to download the image. 
--
Karl Heinz - K5KHK


Re: BitX40 Schematic

Jerry Gaffke
 

They moved everything from hfsigs.com to hfsignals.com to agree with the organization's name
about a month ago.

For the Bitx40v3 schematic, go to hfsignals.com, click BITX40, then click CircuitDescription.
Alternately, just click this:  http://www.hfsignals.com/index.php/2017/11/23/bitx40-circuit-description/

I believe that schematic is correct for everything that has shipped since the transition to the Raduino in Dec 2016, one year ago.
In fact, I believe it still ships with that same firmware (not a bad idea to upgrade to Allard's over at https://github.com/amunters/


On Fri, Dec 22, 2017 at 06:53 pm, AGØH wrote:
I received my BitX40 about a month ago and am planning on making it a winter project.  I wanted to download the schematic that's mentioned on Farhan's BitX40 page.  When I clicked on the download, I received a message that the link was no longer on the server.  I searched this group and found two other requests that were given links that also go to servers that are also a dead end.  Is it possible to download
a schematic of the current (within the last 3 months) BitX40?  Thanks es 73.....


Re: BitX40 Schematic

Gene Nitschke <genenitschke@...>
 


From: BITX20@groups.io <BITX20@groups.io> on behalf of AGØH <kmilr1@q.com>
Sent: Friday, December 22, 2017 9:53 PM
To: BITX20@groups.io
Subject: [BITX20] BitX40 Schematic
 
I received my BitX40 about a month ago and am planning on making it a winter project.  I wanted to download the schematic that's mentioned on Farhan's BitX40 page.  When I clicked on the download, I received a message that the link was no longer on the server.  I searched this group and found two other requests that were given links that also go to servers that are also a dead end.  Is it possible to download
a schematic of the current (within the last 3 months) BitX40?  Thanks es 73.....


BitX40 Schematic

AGØH
 

I received my BitX40 about a month ago and am planning on making it a winter project.  I wanted to download the schematic that's mentioned on Farhan's BitX40 page.  When I clicked on the download, I received a message that the link was no longer on the server.  I searched this group and found two other requests that were given links that also go to servers that are also a dead end.  Is it possible to download
a schematic of the current (within the last 3 months) BitX40?  Thanks es 73.....


Re: Ordered the 10th, no tracking number yet

Woody Coates
 

Email this morning from PayPal telling me it shipped. Tracking number indicated it left India yesterday and had quite the journey. The box was on my front porch when I got home this evening from work. Amazing effort on all involved in getting this here. Thank you so much! Wish I could thank you each in person! Now to the build with my son.


Re: Dummy

Jerry Gaffke
 

So Mike, exactly what resistors did you use to build the 50 ohm resistor assembly?
Jerry

#####################

On Fri, Dec 22, 2017 at 06:08 pm, Michael Hagen wrote:

Use the MOX Resistors.  I used 4 - 200 Ohm and double sided ground plane on my Dummy.

#########
On 12/22/2017 11:08 AM, Jerry Gaffke via Groups.Io wrote:
Critical thing is, exactly what resistors did you use to build the 50 ohm resistor assembly?


Re: 2.2k and 10k resistor purpose? #ubitx

John AE5X <ae5x@...>
 

Thanks Ashhar.


Re: 2.2k and 10k resistor purpose? #ubitx

Ashhar Farhan
 

That is to be added in series with the cw key when yiu want to use the keyer. 2.2k from then cw tip goes to the dot and 10k to the dash paddles.
- f

On 23 Dec 2017 5:19 am, "John AE5X" <ae5x@...> wrote:
What is the purpose of the 2.2k and 10k resistors included in the uBITX kit? I can't find them mentioned on the "wire Up" page:
http://www.hfsignals.com/index.php/ubitx-wire-up/

Tnx,

John


Re: how to coil your own cables

Ashhar Farhan
 

Nice hack!

On 23 Dec 2017 3:10 am, "JP JO" <jaredmcg@...> wrote:
Thanks. A while back I watched a YouTube on same subject. After the hearing the guy spun it backwards to make it snugger (if that's a word)

Sent by me

On Dec 22, 2017, at 2:29 PM, Lawrence Galea <9h1avlaw@...> wrote:

Years ago I used boiling water making sure that the ends were not in the water.
Instead of a heat gun you could borrow the xyl hair dryer.
Whatever works for you.
Regards
Lawrence

On Fri, Dec 22, 2017 at 4:57 PM, Doug W <KD9CYF@...> wrote:
two disclaimers before this post
1) This may be common knowledge but it is new to me.
2) I am only describing what worked for me.  If you ruin your cables, your oven, your house or your marriage kindly forget you heard this from me.

I wanted coiled cables but didn't have any in my junk pile.  After some quick searching, I learned it is very easy to coil cables yourself.  I did not take pictures along the way so I will do my best to describe the process.  Take the straight cable and tape one end around something round like a dowel, pencil, knitting needle or what ever you have.  Wrap it around as long as you want taping the other end when you are done.  I used electrical tape.  You want the wraps to be snug against each other.  Next you need to heat the cable.  I read some people use hot or boiling water.  I used my oven which has a keep warm setting at 190F (about 88C).  I put the wrapped cable on aluminum foil and left it in the oven for about 45 minutes checking every 5 or 10 minutes.  You want the cable very warm to the touch but not hot.  Take it out of the oven and let it cool completely.  I think a heat gun would be easier but I don't have one.  I still shrink my shrink wrap with a lighter.  I did the one below a few weeks ago and it is still holding its shape and is still springy. 



Re: ubitx - Possible to receive 630 meters? #ubitx

Ashhar Farhan
 

You will have to fix the firmware to go down that low.download the ubitx sktech from github, change the line that defines LOWEST_FREQ from 3000000l to 500000l. Note the small letter l at the end of the zeros.
- f

On 23 Dec 2017 1:50 am, "M Garza" <mgarza896@...> wrote:
Hi,
I will be putting my ubitx together after Christmas but was curious if it is possible to modify it to receive 630 meters?  
I already plan on building a lpf for 160 meters, so I will build one for 630 meters as well.
Any thoughts or suggestions?

Thanks

Marco - KG5PRT


Re: Help! I think I may have just ruined my 9 year old's Chanukah

tausciam@...
 

On Fri, Dec 22, 2017 at 02:47 pm, Gordon Gibby wrote:
Maybe take a close up when you get out and let us all see.  
 
Remember, coils  are definitely a short circuit in and of themselves, because they are  just a wire.    
 
You might explain to us what measurement you were making that changes dramatically after you fix the problem

It's all in the troubleshooting video with Farhan. He shows how to touch a wire to capacitors and get noise or a squeal....then tells you about the wires shorting on the coil and spreading them out with tweezers. It worked... or has so far. The only thing I'm inspecting tonight comes in a black bottle with Guinness on it. I've got a 3 day weekend to work on the radio...needed a night without sitting in front of a lunchbox :P