Date   
Template help

Michael Witham
 

Kit arrived but was not delivered, I have to pick it up! Postal deliveryman gets fruitcake for Christmas next year!

On that note, Does anyone have a template or dimensions required for mounting the hardware and panel? 

Thanks in advance!!

Mike/Kd4kld

Re: Idea for future versions of BITX

John VA7JBE
 

Changing the processor to something like a Teensy would allow for more digital modes to be added.  As it stands, CW is about all the Arduino is able to decode.  For something like PSK-31 more clock cycles and a better ADC are required.  I haven't checked the pin-out, but I would think that a few jumpers or even a PCB buffer would be enough to swap the Nano for some other development board.  This would also open up more options for digital filters and user interfaces.


Keeping the DDS and micro controller/processor separate from the main board allows for more flexibility in this regard, and I'd be happy to leave it that way.  On-board refinements for the BitX40 that stick with the original design goal of making a board for experimentation and customization might include adding even more places for people to plug into the signal, like in the IF, or refining what's already there (widening the bandwidth of the crystal filter comes to mind.)

Re: Idea for future versions of BITX

Jerry Gaffke
 

Putting an Si5351 down does not make it inflexible, it can always be disabled (like that analog VFO).  The SoftRock guys have an Si570 on some of their boards, but they took great pains to keep out any digital hash coming from the I2C host that drives it.  Could be that a small processor on the radio board would be better than an arduino, as the board designer could include series resistors to keep edge rates down and choose crystal frequencies that won't interfere.  And caps and ferrite beads and perhaps shielding.  Hard to say what will make the most sense for a $59 transceiver.

Jerry, KE7ER

ending raduino upgrades

Ashhar Farhan
 

hfsigs team says they are ending the upgrades to olde boards that shipped without the raduino on 22nd jan.
if any on the group need the raduino drop a mail quickly to hfsignals@... to get the raduino board at 14 usd.
- f

Re: Idea for future versions of BITX

John Backo
 

I am not so sure that this is a good idea.

If one reads the comments about the various DDS units, a common problem area is controlling the noise.
Putting the DDS on the same board as the rest of the rig would produce an inflexible layout which may
or may not be problematic. The chances are very good that it would be...

In a way, it is the inverse of the problems associate with something like the AD8307. That device is so sensitive
to such a wide range of signals that it is mandatory to shield it away from the rest of the circuits.
With a wide-ranging DDS/PLL unit, one might produce things like birdies which are very hard to trace
and isolate. It's hard enough to think about designing a single (or dual) IF rig covering all of HF
with a wide-ranging VFO and getting it right. Even the best of the HF receivers (like the Sangean)
have birdies. One can hear them just by tuning through the whole range...

Why invite trouble?

john
AD5YE

Re: High voltage and higher power output - what heat sink are you using?

Bill Meara
 

If you "remote" the 510 by adding even a small amount of wire you run the risk of turning that amplifier into a big ugly oscillator (been there, done that!). One of the reasons the BITX 40 amp is so trouble-free is that the layout is good and the leads are very short.  73  Bill N2CQR


On Friday, January 13, 2017 8:14 PM, don frasher via Groups.Io <donfrasher@...> wrote:


What I have done with other projects is to mount the output transistor remotely..  This allows for easy use of the case itself as a heat sink, as well as makes it easier to use "junk box" heat sinks that do not fit the printed circuit board.
  Surprised I have not seen this option all ready mentioned.. pretty simple matter of removing the 510 and running wire.

73
Don Frasher  AD7LL


Re: High voltage and higher power output - what heat sink are you using?

John Daly
 

Thanks, Bill. On another note, thanks for Soldersmoke and your QRP book, which I read 3-4 years old. Will take a look at your information. 73 - w4usf

Re: Video on ND6T's Shuttle DDS Tuning

Bill Meara
 

Roy:  Click on the BITXHACKS link and the video Is there.   Or go to http://bitxhacks.blogspot.com
73  Bill



On Friday, January 13, 2017 8:18 PM, Roy Appleton <twelveoclockhigh@...> wrote:


Great, only problem is that the web site doesn't have a link to any video!

Roy
WA0YMH

On Jan 13, 2017 6:29 PM, "Bill Meara via Groups.Io" <n2cqr=yahoo.com@groups.io> wrote:
Don ND6T sent us a video on his intriguing method of tuning an AD9850 in his BITX 40 Module.  It works very well.  Take a look:




Re: Video on ND6T's Shuttle DDS Tuning

Roy Appleton
 

Great, only problem is that the web site doesn't have a link to any video!

Roy
WA0YMH

On Jan 13, 2017 6:29 PM, "Bill Meara via Groups.Io" <n2cqr=yahoo.com@groups.io> wrote:
Don ND6T sent us a video on his intriguing method of tuning an AD9850 in his BITX 40 Module.  It works very well.  Take a look:


Re: High voltage and higher power output - what heat sink are you using?

don frasher
 

What I have done with other projects is to mount the output transistor remotely..  This allows for easy use of the case itself as a heat sink, as well as makes it easier to use "junk box" heat sinks that do not fit the printed circuit board.
  Surprised I have not seen this option all ready mentioned.. pretty simple matter of removing the 510 and running wire.

73
Don Frasher  AD7LL

Re: High voltage and higher power output - what heat sink are you using?

Bill Meara
 

John:  At first, I had a little muffin fan on the stock heat sink.  But I didn't like the noise and I kept getting my fingers in the blades.  So I did this:
Putting a Heatsink on the BITX40 Module   Be sure to read ZL2DEX's wise counsel in the comments. 




On Friday, January 13, 2017 7:12 PM, John Daly via Groups.Io <wa9whd@...> wrote:


Good evening all. I've been wondering what strategies people are using to increase heat dissipation off the IRF510 final amp when running higher power output level? Is there a logical replacement heat sink used? Or is there a way to integrate additional heat sink metal to dissipate heat? What have those of you running higher power using since the existing heat sink is insufficient for higher than standard power levels? Could a fan be used successfully with the existing heat sink if running 20-25 watts, which appears to be the maximum push for the 510? Thanks for your ideas. 73 - W4USF 


Re: Video on ND6T's Shuttle DDS Tuning

 

Bill that link doesn't work for me.

Joel 
KB6QVI

On Jan 13, 2017, at 4:29 PM, Bill Meara via Groups.Io <n2cqr@...> wrote:

Don ND6T sent us a video on his intriguing method of tuning an AD9850 in his BITX 40 Module.  It works very well.  Take a look:


Video on ND6T's Shuttle DDS Tuning

Bill Meara
 

Don ND6T sent us a video on his intriguing method of tuning an AD9850 in his BITX 40 Module.  It works very well.  Take a look:


High voltage and higher power output - what heat sink are you using?

John Daly
 

Good evening all. I've been wondering what strategies people are using to increase heat dissipation off the IRF510 final amp when running higher power output level? Is there a logical replacement heat sink used? Or is there a way to integrate additional heat sink metal to dissipate heat? What have those of you running higher power using since the existing heat sink is insufficient for higher than standard power levels? Could a fan be used successfully with the existing heat sink if running 20-25 watts, which appears to be the maximum push for the 510? Thanks for your ideas. 73 - W4USF 

Re: Higher voltage for Bitx40 Final

Richard Andrew Knack
 

Well, the other poster said the one he ordered (which I also ended up ordering) are quiet, and they sound like they will work okay for me. THanks!

Rich
KC8MWG


On Friday, January 13, 2017 4:45 PM, MAc B <sp9mrn@...> wrote:


find other seller. ;-) Works very good to circa 22v, over 22v (from 12v supply) mine is very noisy

MAc
mrn

2017-01-13 22:27 GMT+01:00 Richard Andrew Knack via Groups.Io <ihc73scout2@...>:
Wouldn't have worked for me - "Doesn't Post To United States"... :(

Rich
KC8MWG





Re: Higher voltage for Bitx40 Final

MAc B
 

find other seller. ;-) Works very good to circa 22v, over 22v (from 12v supply) mine is very noisy

MAc
mrn

2017-01-13 22:27 GMT+01:00 Richard Andrew Knack via Groups.Io <ihc73scout2@...>:

Wouldn't have worked for me - "Doesn't Post To United States"... :(

Rich
KC8MWG



Re: Higher voltage for Bitx40 Final

Richard Andrew Knack
 

Wouldn't have worked for me - "Doesn't Post To United States"... :(

Rich
KC8MWG


Re: Higher voltage for Bitx40 Final

Carl Moser
 

Re: Idea for future versions of BITX

cx4ol@...
 

Good afternoon, very good idea.
July

first qso on 80m band with bitx

9a3xz
 

guys,i put a litlle funny video and you will see Bitx in action ;)


https://www.youtube.com/watch?v=j-nPVt72utE&t=206s