Date   
Re: No RF Power Output From Bitx40

Curt M.
 

Yes, I'm getting 12V to the drain when The PTT is pressed

Re: Circuit Diagrams

Dexter N Muir
 

Thanks, folks. I have the info I needed. Heard first sigs in amongst a pile of static, so progress is being made. Just investigated how to wire the second supplied 3.5mm socket for the mic in a basic no-name mono headset ...

May not be going to respite this month - they don't like colds, let alone 'flu (not surprising, and quite understandable) - so may have more time at home to tinker.

Re: VU2ESE Agc circuit

John P
 

On Wed, Jun 7, 2017 at 06:47 am, ohwenzelph wrote:
Ok, the 5-2-2017 revised schematic in the wiki makes it clear where to put the agc circuit (instead of just audio in & audio out. "splain it to me like I'm 5 please"
I'm confused too. I can't seem to find the version of the schematic that you referenced; still trying to find my way around here! So much to digest!

I thought I read somewhere that the red wire from the volume control connector should go to the input of the AGG, and the output should go to the volume control where the red wire previously went, but I can't find that again either.

Is this correct?

Thanks!

--
John - WA2FZW

Re: Circuit Diagrams

MVS Sarma
 

I had converted the same sch into B&W and here it is.

On Sun, Jul 9, 2017 at 2:44 AM, Dexter N Muir <dexy@...> wrote:
Is there a circuit diagram with 'hovers' over the components? My eyesight and computer schema do not lend well to viewing the diagram at hfsigs.




--
Regards
Sarma
 

Re: No RF Power Output From Bitx40

 

Before you yank out the IRF, do this check:

Power the board and final, disconnect MIC and with PTT pressed check if 12V is getting to the IRF drain.

At 09/07/2017, you wrote:
I have some IF510's on order. I hope that's the problem because it will be an easy fix. It's worth a shot.

I've never tried transmitting with this radio without a dummy load attached.

Re: No RF Power Output From Bitx40

John Smith
 

I totally agree with ekelly. I have had almost exactly the same experience with lifting a trace from the top of the board while focusing on the bottom of the board where the solder pads are. The solder was still attached on the top when I pulled it out, lifting the trace back to the inductor coil. I had to make that trace on the bottom side with a bit of wire. The last time I replaced the IRF510, I clipped the leads high, and soldered the new one to the leads sticking up from the board. I'll never have to worry about damaging the board if I need to replace the PA again.


On Sat, Jul 8, 2017 at 07:00 pm, ekelley wrote:
IRF510 - A tip for those replacing the transistor. Don't try to remove it with a solder sucker. The pins fit
too tightly into the circuit board and unless you have a way of heating all three pins at the same time.
Try this, carefully clip the pins at the bottom of the transistor, if it is dead, nothing lost. Once the transistor
is gone, you can easily remove one pin at a time leaving a clean hole for installing the new transistor.
I replaced three of them and wound up damaging the circuit track on the board. The 510's are inexpensive
and not worth trying to save them, even if you are removing them to test them. They are too sensitive!
Ed

Re: No RF Power Output From Bitx40

Curt M.
 

I have some IF510's on order. I hope that's the problem because it will be an easy fix. It's worth a shot. 

I've never tried transmitting with this radio without a dummy load attached. 

Re: No RF Power Output From Bitx40

ekelley
 

IRF510 - A tip for those replacing the transistor. Don't try to remove it with a solder sucker. The pins fit
too tightly into the circuit board and unless you have a way of heating all three pins at the same time.
Try this, carefully clip the pins at the bottom of the transistor, if it is dead, nothing lost. Once the transistor
is gone, you can easily remove one pin at a time leaving a clean hole for installing the new transistor.
I replaced three of them and wound up damaging the circuit track on the board. The 510's are inexpensive
and not worth trying to save them, even if you are removing them to test them. They are too sensitive!
Ed

On 7/8/2017 8:40 PM, M Garza wrote:
It sounds like the IRF510 is bad.  Do you have a transistor tester to check it? They are very sensitive.  I still have not put my radio together, but a bought 10 IRF510s to experiment with and to have spares.  Good luck,
Marco - KG5PRT 

On Jul 8, 2017 6:02 PM, <Kc3hjp@...> wrote:
Ok, just tested it. I have 12v on pin 3 when I key up the mic and I get 5v out on pin 1 when I key up the mic. 

Re: Circuit Diagrams

M Garza <mgarza896@...>
 

Usually, ctrl and + will magnify and ctrl and - will make it smaller.

Good luck,

Marco - KG5PRT 

On Jul 8, 2017 4:46 PM, "Daniel Isaza" <hk4dei@...> wrote:
If you're viewing it from the main site, try this direct link to the image file:

http://www.hfsigs.com/bitx40v3_circuit.png

then click over it to view full size on your browser, also, every web browser has a zoom function, look for it.

Dan.

On Sat, Jul 8, 2017 at 4:14 PM, Dexter N Muir <dexy@...> wrote:
Is there a circuit diagram with 'hovers' over the components? My eyesight and computer schema do not lend well to viewing the diagram at hfsigs.


Re: No RF Power Output From Bitx40

M Garza <mgarza896@...>
 

It sounds like the IRF510 is bad.  Do you have a transistor tester to check it? They are very sensitive.  I still have not put my radio together, but a bought 10 IRF510s to experiment with and to have spares.  Good luck,
Marco - KG5PRT 

On Jul 8, 2017 6:02 PM, <Kc3hjp@...> wrote:
Ok, just tested it. I have 12v on pin 3 when I key up the mic and I get 5v out on pin 1 when I key up the mic. 

Re: W8TEE Software Release 1.00

Adrian
 

Thanks Jack

Adrian

Re: 80m hexfet power amplifier by W7ZOI

Daniel Isaza
 

Dear Farhan,

I'm now building the PA but I'm in doubt about the two unmarked capacitors at each side of the input attenuator, should I use 0.1uF each?
Thanks.
Dan,
HK4DEI

On Fri, Jul 7, 2017 at 9:07 PM, Richard Andrew Knack via Groups.Io <ihc73scout2@...> wrote:
I had my WA2EBY toroids wound for me by the same guy who does the toroid sets for Elecraft, to Elecraft's approved standards. I am waiting for the rest of the parts to arrive from Mouser, with the exception of the SMD resistors, which are on order from China. The ones from Mouser are on back-order, and won't arrive until NOVEMBER (!), and I really don't want to wait quite that long...

Rich
KC8MWG



On Friday, July 7, 2017, 9:04:32 PM EDT, Jack Purdum via Groups.Io <econjack=yahoo.com@groups.io> wrote:


Diz's company, Kits And Parts, is a gold mine for hard-to-find caps and toroids. A friend of mine has one of his One Watters and it's a fun little rig. Keep him in mind when you're building.

Jack, W8TEE



From: Leonard <dredger@...>
To: BITX20@groups.io
Sent: Friday, July 7, 2017 8:23 PM
Subject: Re: [BITX20] 80m hexfet power amplifier by W7ZOI


"Yeah, I forgot about Diz. He's good. He also has a toroid kit for the
WA2EBY LPF assembly, but not a cap kit as far as I know...

john
AD5YE"

Diz might put together a mica cap kit for the wa2eby amplifier. Someone would have to ask him. That's how the toroid kit came to be. I asked him. I bought all of the mica caps from Mouser.

Mouser parts list


Low pass filter test with network analyzer

Leonard





Re: A suitable case ?

Jack Purdum <econjack@...>
 


From: Michael Hagen <motdog@...>
To: BITX20@groups.io
Sent: Saturday, July 8, 2017 7:13 PM
Subject: Re: [BITX20] A suitable case ?


Fits like a Glove!   Jameco, I like them.
They upped the price a buck since I bought.
Warning, the Bottom (White) is Al.
But, the Top (Black) IS STEEL.  I know, I put my speaker there!
No Nibbling on the TOP.  I drilled and then sabre saw, and big half round file.

By the way, they got an inexpensive Nibbler.  Good for under 1/16" Al?

Mike, WA6ISP


On 7/8/2017 4:02 PM, Jack Purdum via Groups.Io wrote:
Nope. The TFT displays are 2.5" high.

Jack, W8TEE



From: Craig Wadsworth <cwadsworth@...>
To: BITX20@groups.io
Sent: Saturday, July 8, 2017 6:21 PM
Subject: Re: [BITX20] A suitable case ?

Raj: Thanks for the tip.  I wonder if there would be enough space for Jack Purdum's TFT display?






-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...


Re: A suitable case ?

Michael Hagen
 


Fits like a Glove!   Jameco, I like them.

They upped the price a buck since I bought.

Warning, the Bottom (White) is Al.

But, the Top (Black) IS STEEL.  I know, I put my speaker there!

No Nibbling on the TOP.  I drilled and then sabre saw, and big half round file.


By the way, they got an inexpensive Nibbler.  Good for under 1/16" Al?


Mike, WA6ISP


http://www.jameco.com/z/CMC-11922-R-Case-Metal-5-9-L-x-5-3-W-x-3-0-H-50-Cs_208911.html


On 7/8/2017 4:02 PM, Jack Purdum via Groups.Io wrote:
Nope. The TFT displays are 2.5" high.

Jack, W8TEE



From: Craig Wadsworth <cwadsworth@...>
To: BITX20@groups.io
Sent: Saturday, July 8, 2017 6:21 PM
Subject: Re: [BITX20] A suitable case ?

Raj: Thanks for the tip.  I wonder if there would be enough space for Jack Purdum's TFT display?






-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: A suitable case ?

Jack Purdum <econjack@...>
 

Nope. The TFT displays are 2.5" high.

Jack, W8TEE



From: Craig Wadsworth <cwadsworth@...>
To: BITX20@groups.io
Sent: Saturday, July 8, 2017 6:21 PM
Subject: Re: [BITX20] A suitable case ?

Raj: Thanks for the tip.  I wonder if there would be enough space for Jack Purdum's TFT display?





Re: No RF Power Output From Bitx40

Curt M.
 

Ok, just tested it. I have 12v on pin 3 when I key up the mic and I get 5v out on pin 1 when I key up the mic. 

Re: Raduino v1.18 (improved CW performance) released

 

Yes the setting at 40Hz is off a bit and same with 50Hz it seems like if i could find a middle ground all would be spot on.

David

Re: A suitable case ?

Craig Wadsworth <cwadsworth@...>
 

Raj: Thanks for the tip.  I wonder if there would be enough space for Jack Purdum's TFT display?



Re: W8TEE Software Release 1.00

Joe
 

Thanks Jack

Joe
VE1BWV

On Sat, Jul 8, 2017 at 6:14 PM, Jack Purdum via Groups.Io <econjack@...> wrote:
Within the hour I will be uploading Release 1.00 of the software for the TFT mods discussed earlier. This software assumes you are using the PCB, AD9850, Mega 2560 Pro Mini, and rotary encoder as was discussed here earlier. There are three files: 
   1) B40SoftwareRel0100.ino  --  the main sketch for the Mega
   2) MorseCode.h --  a supporting file that holds a number of data items used for the (pending) CW mode.
   3) Assembly Manual --  only one page right now, and that centers around how to get the Voltage field on the display to work properly. It also discusses the required directory structure needed to compile the files.

I apologize for the long time it took to get this out there, but there have been numerous fires that needed to be stomped out first. Please report bugs as soon as you find them so others don't get frustrated.

Jack, W8TEE


Re: Raduino v1.18 (improved CW performance) released

Allard PE1NWL
 

On Sat, July 8, 2017 23:12, N8DAH wrote:
Can we add fine tune as a option that can turn on and off in the normal
mode settings w/o the "tune" button? I also noted in my Bitx I am about
45Hz off so I either get 40 or 50Hz I can't fine tune the radio settings.
Hi David,

you mentioned your BitX is 45Hz off, did the calibration procedure not
work for you?
Or do you mean that the 10Hz precision of calibration procedure is not
sufficient? Calibration currently works in steps of 10 Hz (at the time I
assumed this is sufficient precision), but perhaps we should change the
step size of the cal procedure to 1 Hz for even more accuracy?)

73 Allard PE1NWL