Re: uBITX - A reboot of the old BITX
Nice AndyH. Let me correct myself, playing with www.toroids.info shows that the nH and 1.1 uH values are a poor choice for FT 37-43.?
|
Re: uBITX - A reboot of the old BITX
On Mon, Mar 6, 2017 at 07:02 am, Ashhar Farhan wrote: The inductor values are in the schematic. You can calculate the turns from - f
Ashhar, Here's my first attempt from posts, the schematic, and from your web text. ?Please confirm T1 thru T11 and the choice of 26 AWG. ?Please also provide winding details for T5 and T6, and T10 and T11. Thanks sir!
|
|
Core |
Color |
|
Turns |
|
|
| T1 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T2 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T3 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T4 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T5 |
|
FT 37-43 |
Black |
4:1 |
|
|
|
| T6 |
|
FT 37-43 |
Black |
4:1 |
|
|
|
| T7 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T8 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T9 |
|
FT 37-43 |
Black |
|
8:8:8 trifilar |
8 turns/inch |
26 AWG |
| T10 |
|
FT 37-43 |
Black |
|
|
? |
|
| T11 |
|
FT 37-43 |
Black |
8T:10T |
|
|
|
|
|
|
|
|
Calculated: toroids.info/T37-6php |
| L1 |
330 nH |
T 37-6 |
Yellow |
|
10.5 |
|
|
| L2 |
390 nH |
T 37-6 |
Yellow |
|
11.4 |
|
|
| L3 |
390 nH |
T 37-6 |
Yellow |
|
11.4 |
|
|
| L4 |
330 nH |
T 37-6 |
Yellow |
|
10.5 |
|
|
|
|
|
|
|
|
|
|
| L5 |
720 nH |
T 37-6 |
Yellow |
|
15.5 |
|
|
| L6 |
720 nH |
T 37-6 |
Yellow |
|
15.5 |
|
|
| L7 |
720 nH |
T 37-6 |
Yellow |
|
15.5 |
|
|
|
|
|
|
|
|
|
|
| L8 |
60 uH |
FT 37-43 |
Black |
|
13.1 |
|
|
| L9 |
60 uH |
FT 37-43 |
Black |
|
13.1 |
|
|
|
|
|
|
|
|
|
|
| L10 |
360 nH |
T 37-6 |
Yellow |
|
11.0 |
|
|
| L11 |
1.1 uH |
T 37-6 |
Yellow |
|
19.1 |
|
|
| L12 |
180 nH |
T 37-6 |
Yellow |
|
7.7 |
|
|
| L13 |
1.0 uH |
T 37-6 |
Yellow |
|
18.3 |
|
|
| L14 |
360 nH |
T 37-6 |
Yellow |
|
11.0 |
|
|
| L15 |
1.1 uH |
T 37-6 |
Yellow |
|
19.1 |
|
|
|
Re: uBITX - A reboot of the old BITX
Craig, Taking a good look at the picture of a built version on??,my eyes tell me that?toroidal cores are used for the inductors and transformers. My understanding is that inductors wound on toroids are superior but more expensive and can also be wound to desired value. Also 43 looks like a good material for the frequencies and powers used in both these cases. If you don't have one already than this could be a good excuse to by one of the neat LCD meters available. http://www.banggood.com/GM328-M328-LCD-Backlight-Digital-Transistor-Tester-p-961337.html
http://www.amidoncorp.com/product_images/specifications/2-03.pdf
|
A question for the UK guys.
What sort of delivery times are you experiencing? I have to be in UK around 23-25 of March. Thinking that might not be enough time if ordered now.
Thanks
Martin, HS0ZED
|
College Professor Simon Thompson
A good power supply always makes a big difference to the way a radio operates; I think the Bitx40 is a great opportunity to build a power supply, with a big capacitor and a line filter and a transformer and everything! I am building one right now out of spare parts from the junk drawer.
toggle quoted message
Show quoted text
On Mar 7, 2017, at 6:40 PM, vk3xl via Groups.Io < vk3xl@...> wrote:
You will prpobably need something that can deliver about 1.5A at 12v well regulated. I dont think a wallwart would be good enough. I have used various power supplies with mine. 12v bench supply, 14.1v LIfe battery, 19.5v laptop power supply and a benchtop supply at 28V. In all cases I have ?a 12v regulator inside the ?case to power the board and raduino and the seperate (high voltage) goes to the final. Effectively I can power my BitX40 form any supply between 12v and 28v and everything works. at 28v I get a bit over 20w output. at 12v I get about 5w output.
--
Mike VK3XL
|
OK Simon,
What I had not mentioned is that the carrier balance pot needs to be re adjusted. Listen to the carrier leak in a near by Rx and adjust for a
minimum or scope the output after removing the mic connector and adjust the 106 for minimum carrier.
Make sure the series cap you put is not more than 0.1uF.
toggle quoted message
Show quoted text
At 08/03/2017, you wrote: Raj
I cut the track beteween the wiper of r106 and r38 and confirmed the break with my multimeter. Then put the cap across that break.
The reference in my earlier post to "path to ground" was refering to the path through the diode and then on through r39, ie the path we are putting the cap in series with.
Regards
Simon VK3ELH
|
Hi What is your serial number. It is written on the main board. Randy, K7AGE
On Tue, Mar 7, 2017 at 5:53 PM, km4wii via Groups.Io <km4wii@...> wrote: My bitx40 just arrived. Ordered 2/12 delivered 3/7.? Too bad there's a halfway this weekend. Maybe I'll get some build time Sunday afternoon. Wish me luck!
|
You will prpobably need something that can deliver about 1.5A at 12v well regulated. I dont think a wallwart would be good enough. I have used various power supplies with mine. 12v bench supply, 14.1v LIfe battery, 19.5v laptop power supply and a benchtop supply at 28V. In all cases I have ?a 12v regulator inside the ?case to power the board and raduino and the seperate (high voltage) goes to the final. Effectively I can power my BitX40 form any supply between 12v and 28v and everything works. at 28v I get a bit over 20w output. at 12v I get about 5w output.
--
Mike VK3XL
|
Re: uBITX - A reboot of the old BITX
To continue beating this horse unto death, we could use twenty-six FT37-43 cores to wind L1-L15 and T1-T11? Be gentle, I'm still just a cookbook technician.
|
I've been lurking for a while now, ?my Bitx40 should be here any day. It occurred to me today while driving, I don't recall seeing any discussion about power supply. Wall wart? Battery? Other??
regards, Richard? W2KAP
On Mar 7, 2017 9:03 PM, "davetelling ." < davetelling@...> wrote: I just ordered mine. Reading the posts here is torture! ;-)
|
I just ordered mine. Reading the posts here is torture! ;-)
On Mar 7, 2017 5:53 PM, "km4wii via Groups.Io" <km4wii= [email protected]> wrote: My bitx40 just arrived. Ordered 2/12 delivered 3/7.? Too bad there's a halfway this weekend. Maybe I'll get some build time Sunday afternoon. Wish me luck!
|
Hamfest not halfway. Stupid autocorrect
|
My bitx40 just arrived. Ordered 2/12 delivered 3/7.? Too bad there's a halfway this weekend. Maybe I'll get some build time Sunday afternoon. Wish me luck!
|
College Professor Simon Thompson
Hi
Could you send a picture of your modification?
toggle quoted message
Show quoted text
On Mar 6, 2017, at 4:06 PM, Joel Caulkins < caulktel@...> wrote:
I just removed the Raduino regulator and mounted it to the bottom of my case, then ran 3 short wires back to the board with .1mfd caps from the input and output to ground. It now runs stone cold. Oh, I have no tuning clicks either.
Joel KB6QVI
|
?I suppose you are his spokesman?? The BITX40 will inspire you to experiment. Modify it, mount it, tweak it, change it.?Also stated;?Raduino is a standard Arduino Nano ??
He doesn't build these. ? That's not a an excuse (That's not for a failed product out of the box) He states they are checked out. Larry
On Tue, Mar 7, 2017 at 4:39 AM, Larry Smith <815cpu@...> wrote: Well, got my Bitx40 over the weekend, ?Wired it up and it doesn't work.? That is, the hiss from the speaker can be volume controlled.? The display has all blackened row of pixels.? Tuning will not respond even with antenna connected. Connected a dummy load and PTT brings up the xmiter and additional current draw.? However no response from the mic.? The rArduino shows the power ON led working.? The display pot works.? Pressing the Arduino reset button seem not to do much.? I have several of the Arduino Nano here.? I may have lost the sketch for the Bitx 40.? If I had the code I could down load it again.? Yes -I triple checked my wiring.? Disappointed that it isn't responding.? I got the instructions for assembly off the HFSIGS web site.? I suppose it'll mean oscope time...wasn't planning to make this a career HI ?It may still turn out to be something goofy (I hope), ?I'm hoping there is a Sketch listed somewhere. ?any ideas will be appreciated.
|
Re: uBITX - A reboot of the old BITX
It would have been much more use just to say the core types and the amount of turns .... Job done ... Simple.
Regards
On Tue, 7 Mar 2017 at 21:46, Ray Koster via Groups.Io <raykoster@...> wrote: The Inductance for L1 to L15 are shown and can be worked out from Calculators on the net, But there is no data on T1 to T10. Are they all the same? and if so, are they the same as the Bitx40? any info would be very hekpful..Thank You.
Ray Koster G7BHQ
|
Re: uBITX - A reboot of the old BITX
I think these are useful: /g/BITX20/message/22955?p=Created,,,20,1,20,0::recentpostdate%2Fsticky,,,20,2,0,4438163 "?I have a box full of trifiilar wound, FT37-43 that I can solder in anywhere." /g/BITX20/message/22967?p=Created,,,20,1,40,0::recentpostdate%2Fsticky,,,20,2,0,4438163 "T10 and T11 look like all the other trifilar FT37-43 transformers but as they are both handling power I assume they need something bigger. Ashar, what cores did you use?" /g/BITX20/message/22968?p=Created,,,20,1,40,0::recentpostdate%2Fsticky,,,20,2,0,4438163 "T10 is same. T11 is not really a trifilar transformer. Instead, it is an 8t:10t transformer on an ft3743. As there is no dc through T11, it can handle 10 watts of rf."
|
Re: uBITX - A reboot of the old BITX
If there is a list being compiled, for future purchasing of an assembled version of the uBITX, please add me to it. ? kg4rul@...
|
Re: uBITX - A reboot of the old BITX
The Inductance for L1 to L15 are shown and can be worked out from Calculators on the net, But there is no data on T1 to T10. Are they all the same? and if so, are they the same as the Bitx40? any info would be very hekpful..Thank You.
Ray Koster G7BHQ
|
Raj I cut the track beteween the wiper of r106 and r38 and confirmed the break with my multimeter. Then put the cap across that break.?
The reference in my earlier post to "path to ground" was refering to the path through the diode and then on through r39, ie the path we are putting the cap in series with. Regards
Simon VK3ELH
|
Raj vu2zap
Craig Wadsworth
Marc Jones