Re: Buzz on power up and low power
If the quiescent current into the IRF510 is still around 100ma when transmitting,
then that IRF510 is probably fine.
Yes, R141 should be 10 ohms.
Buzz could well be just a noisy power supply, try a 12v battery.
If that's not it, then since it gets louder when af gain is up, it's before the volume control.
Maybe in the 2n3904 audio pre-amp.
?
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On Fri, Dec 22, 2017 at 10:13 pm, TheRubbersoul1991 . wrote:
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?
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Had been thinking "3W 200 ohm metal oxide on Mouser" would still be quite a selection.
But saw only a few that were normally stocked, and only one that was anywhere near $0.10 in small quantities:
? ?
Going for the 3W parts was a good steer.
If I blow $2 on 20 at 1k of the 3W Xicon resistors,
could dissipate 60W continuously without the complication of an oil bath.
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On Fri, Dec 22, 2017 at 06:37 pm, Jerry Gaffke wrote:
So Mike, exactly what resistors did you use to build the 50 ohm resistor assembly?
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Buzz on power up and low power
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
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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
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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.
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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?
--
Michigan VHF Corp.
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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
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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 --
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Re: ubitx - Possible to receive 630 meters?
#ubitx
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: [email protected]
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
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Re: ubitx - Possible to receive 630 meters?
#ubitx
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
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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.
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Re: CW Key/Keyer/paddle idea
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
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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
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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:??
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?
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On Fri, Dec 22, 2017 at 06:53 pm, AG?H 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.....
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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.....
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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.....
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Re: Ordered the 10th, no tracking number yet
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.
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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?
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Re: 2.2k and 10k resistor purpose?
#ubitx
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Re: 2.2k and 10k resistor purpose?
#ubitx
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:
Tnx,
John
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Re: how to coil your own cables
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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
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N8DAH
Goran VE6GPO