Date   
Re: Off topic again: A direct conversion receiver

Greg W:-) <onegammyleg@...>
 

Thanks , that looks like a neat little project.

But , is it just me, or does Yahoo deliberately break the links in
emails now with spaces.??
I have seen it a quite a few times on my mail outs from various groups
the links have extra spaces added in them , that of course breaks the
link.

For example ,, as shown in my delivered email today was - straightkey.
blogspot. com

GRRRR !

gregW:-) OH2FFY


http://www.swdxer.co.nr/
=====================================================================

--- In BITX20@..., farhan@... wrote:


I have posted a simple direct conversion receiver on my blog.
you can view the post on straightkey.blogspot.com. the receiver's
write up
in on phonestack.com/farhan/dc40.html.

the reason for this post is that the audio section of this receiver
might
be a good substitute for the audio section of the bitx20.

- farhan

Off topic again: A direct conversion receiver

farhan@...
 

I have posted a simple direct conversion receiver on my blog.
you can view the post on straightkey.blogspot.com. the receiver's write up in on phonestack.com/farhan/dc40.html.

the reason for this post is that the audio section of this receiver might be a good substitute for the audio section of the bitx20.

- farhan

Re: Off topic: A New Blog

Bernard MOUROT
 

----- Original Message -----
From: wimmie262000
To: BITX20@...
Sent: Wednesday, May 30, 2007 5:01 PM
Subject: [BITX20] Re: Off topic: A New Blog


Wow, did you connect your old Teletype to the Internet? ;-)





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Re: Off topic: A New Blog

wimmie262000 <wvh@...>
 

Wow, did you connect your old Teletype to the Internet? ;-)

Re: Off topic: A New Blog

pgdaulton <k5wms@...>
 

--- In BITX20@..., "ashhar_farhan" <farhan@...> wrote:

I have started a new blog on http://straightkey.blogspot.com/. where i
will rant about homebrewing in general. in the first post today, i
discuss setting up a reasonable home lab.
ASSHAR THANKS FOR SETTING UP THE NEW BLOG.I'VE ENJOYED
BUILDING TWO OF YOUR BITX RIGS, BUT I VALUE THE KNOWLEDGE
GAINED FROM THE YAHOO GROUP EVEN MORE.

I GET SOME ARGUEMENT FORM OTHERS BUT I THINK AMATEUR RADIO
EXISTS FOR "EDUCATION AND RECREATION" EMPHASIS ON EDUCATION

HOPE I CAN CONTRIBUTE TO THE NEW SITE.

PAUL DAULTON K5WMS

Off topic: A New Blog

ashhar_farhan <farhan@...>
 

I have started a new blog on http://straightkey.blogspot.com/. where i
will rant about homebrewing in general. in the first post today, i
discuss setting up a reasonable home lab.

Re: Impressive BITX based kit

Steve drury <g6alu@...>
 

My email didn't reach the group, here it is again directly posted...

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Hi Rahul,

I was going to announce it when proven... about 10 have been built so
far. I didn't want too many questions whilst I was sorting
the "issues" out!

I will get a complete data pack on the net as soon as possible, this
will have PCB data and a complete bill of materials for any one
wanting to replicate it.

Steve G6ALU


--- In BITX20@..., "vu3wjm" <vu3wjm@...> wrote:


Hi! All

Saw today this kit based on BITX scheme by MKARS of UK. An eighty
mtr
version, Iam impressed.


http://myweb.tiscali.co.uk/mkars/MKARS80.htm

73

Rahul VU3WJM

Impressive BITX based kit

Rahul Srivastava
 

Hi! All

Saw today this kit based on BITX scheme by MKARS of UK. An eighty mtr
version, Iam impressed.


http://myweb.tiscali.co.uk/mkars/MKARS80.htm

73

Rahul VU3WJM

Re: First Contact

Sunil Lakhani <freedomworld123@...>
 

--- In BITX20@..., "Dan Reynolds" <on30ng@...> wrote:

Paul, words don't hardly describe it. I've always wanted to build
something
from scratch. I just never could make the little things I tried work
out and
it took me this long to build up the courage. The way the BITX was
described
I figured I couldn't lose. Seems to hold true! :-)

I got the board set from Sunil in India. I built up both boards
using the
binoc cores, the IF cans (bandpass filter) but I ended up swapping
some of
the binoc cores out for regular toroids. I used an MPS110 in the
first RX RF
amp. It might be just a touch too hot. I get some distortion on strong
signals. I did that because I wasn't getting much audio and come to
find out
I had a bad cap in the audio section. I had to add an extra cap to
the BFO
to get the SSB to sound right. Probably just due to my crystals more
than
anything else.
When I finally got the main board right then I tackled the PA board
and I
had fits with it. I finally just rebuilt it Manhattan style with
some extra
shielding around it. It worked FB the first time I fired it up.
http://www.jessystems.com/Images/pa_board-rev1.jpg
My email Elmer, Pete, W6JFR helped me out immensely as this was my first
attempt at something this major. You can see more pictures at that
link as
well as Pete's fine homebrew.
Oh almost forgot the VFO is a design by PE1ABE that I had read about
in the
BITX archives. It uses a varactor and a ten turn pot (which I had in the
junk box).
Sure was rewarding. Real rewarding.
Now I need to make a freq. counter (planning on using PA2OHH's binary
counter). Oh, my ATU is a Hans Summers design, hombrew as well.
73's
Dan KB9JLO
<><

On 5/10/07, paul daulton <k5wms@...> wrote:

DAN

GIVE US A LITTLE DECRIPTION OF YOUR BITX.



WAS IT DEAD BUG, PC BOARD. AND ANY MODIFICATIONS YOU

INCORPORATED.



YOURS IS AN ACCOMPLISHMENT YOU CAN BE PROUD OF FOR YEARS TO

COME.



PAUL DAULTON K5WM


[Non-text portions of this message have been removed]
Hi Dan,
Nice to learn that you have made contacts with your Bitx.I am posting
your Bitx picture and your comments on cqbitx blog.
All the best.

Re: ARRL Homebrew Challenge

Rahul Srivastava
 

Hi!

Rightly said David this is exactly the spirit BITX was conceived for.

Free4all.

73

Rahul VU3WJM



ve3sti <VE3STI@...> wrote:
The copyright issue is interesting. I agree that keeping the BITX "entirely free of
any copyright and patent mumbo jumbo" is in the best interest of ham radio
experimentation.

The ARRL does, however, publish many articles about commercial kits. I can't imagine that
the designer/manufacturer hands over the copyright of the project to the ARRL. Perhaps
the specific write up as published in QST and the specific schematic drawn by the QST staff
is copyright but I can't imagine the ARRL taking over the copyright of the design per se.

I don't know all the legal ins-and-outs or the commercial implications of all this - but I do
favour carrying on the long tradition of hams sharing ideas and designs freely. I also wish
the ARRL all the best in the Homebrew Challenge! The results should be very interesting.

David
VE3STI

--- In BITX20@..., farhan@... wrote:


I was reading through the rules of ARRL homebrew challenge. i conclude
that BITX is not a runner for this one. Not atleast in its original form.

the issue is not technical but legal. the bitx20 is a free design while
the ARRL rule says that the schematics, the writeup etc will be copyright
of ARRL.

i attribute the popularity of bitx to the fact that it is entirely free of
any copyright and patent mumbo jumbo and i hope the group agrees with me
that keeping it that way is in teh best interests of the design.

on the other hand, there is nothing to prevent one of us from basing a
design on bitx20 and submitting that for the challenge. it will have to be
a different write up, redrawn schematic and a new name for the rig.

- farhan





---------------------------------
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Re: ARRL Homebrew Challenge

ve3sti
 

The copyright issue is interesting. I agree that keeping the BITX "entirely free of
any copyright and patent mumbo jumbo" is in the best interest of ham radio
experimentation.

The ARRL does, however, publish many articles about commercial kits. I can't imagine that
the designer/manufacturer hands over the copyright of the project to the ARRL. Perhaps
the specific write up as published in QST and the specific schematic drawn by the QST staff
is copyright but I can't imagine the ARRL taking over the copyright of the design per se.

I don't know all the legal ins-and-outs or the commercial implications of all this - but I do
favour carrying on the long tradition of hams sharing ideas and designs freely. I also wish
the ARRL all the best in the Homebrew Challenge! The results should be very interesting.

David
VE3STI

--- In BITX20@..., farhan@... wrote:


I was reading through the rules of ARRL homebrew challenge. i conclude
that BITX is not a runner for this one. Not atleast in its original form.

the issue is not technical but legal. the bitx20 is a free design while
the ARRL rule says that the schematics, the writeup etc will be copyright
of ARRL.

i attribute the popularity of bitx to the fact that it is entirely free of
any copyright and patent mumbo jumbo and i hope the group agrees with me
that keeping it that way is in teh best interests of the design.

on the other hand, there is nothing to prevent one of us from basing a
design on bitx20 and submitting that for the challenge. it will have to be
a different write up, redrawn schematic and a new name for the rig.

- farhan

Re: How much recieve current draw for the Bitx20?

padmanabhan cattamanchi
 

12 v 300-400 milliamps on receive
about 12.v 2 amps on transmit with a single IRF 510

paddy
vu2pep


--- Rob Frohne <frohro@...> wrote:

Hi All,

Forgive me if it is easily available somewhere, but
I didn't notice it.
How much current is drawn during receive?

Thanks & 73,

Rob, KL7NA




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Re: How much recieve current draw for the Bitx20?

Rob Frohne <frohro@...>
 

Thanks Guys!

That is what I was looking for!

73,

Rob

On Mon, 2007-05-14 at 07:33 -0600, Arv Evans wrote:
Rob KL7NA

Receive mode current:

* 116 ma on my BITX20 (Farhan's original version)
* 154 ma on my BITX40 (including H&P Stabilizer, S-meter, ALC, G0UPL
Counter, etc.)
* 114 ma on BITX20A (Hendricks QRP Kit prototype version 1.1)
* 118 ma on BITX20A (Hendricks QRP Kit prototype version 1.2)

Arv - K7HKL
_._

Leonard wrote:

Mine draws 123 ma. Theres probably about 10 ma of that for the power
led.
Leonard
KC0WOX

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Rob
Frohne <frohro@...> wrote:

Hi All,

Forgive me if it is easily available somewhere, but I didn't
notice it.
How much current is drawn during receive?

Thanks & 73,

Rob, KL7NA






Yahoo! Groups Links


Re: How much recieve current draw for the Bitx20?

Arv Evans
 

Rob KL7NA

Receive mode current:

* 116 ma on my BITX20 (Farhan's original version)
* 154 ma on my BITX40 (including H&P Stabilizer, S-meter, ALC, G0UPL
Counter, etc.)
* 114 ma on BITX20A (Hendricks QRP Kit prototype version 1.1)
* 118 ma on BITX20A (Hendricks QRP Kit prototype version 1.2)

Arv - K7HKL
_._

Leonard wrote:


Mine draws 123 ma. Theres probably about 10 ma of that for the power
led.
Leonard
KC0WOX

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Rob
Frohne <frohro@...> wrote:

Hi All,

Forgive me if it is easily available somewhere, but I didn't
notice it.
How much current is drawn during receive?

Thanks & 73,

Rob, KL7NA

Re: How much recieve current draw for the Bitx20?

Leonard <bitx@...>
 

Mine draws 123 ma. Theres probably about 10 ma of that for the power
led.
Leonard
KC0WOX



--- In BITX20@..., Rob Frohne <frohro@...> wrote:

Hi All,

Forgive me if it is easily available somewhere, but I didn't
notice it.
How much current is drawn during receive?

Thanks & 73,

Rob, KL7NA

How much recieve current draw for the Bitx20?

Rob Frohne <frohro@...>
 

Hi All,

Forgive me if it is easily available somewhere, but I didn't notice it.
How much current is drawn during receive?

Thanks & 73,

Rob, KL7NA

Re: First Contact

Dan Reynolds
 

Paul, words don't hardly describe it. I've always wanted to build something
from scratch. I just never could make the little things I tried work out and
it took me this long to build up the courage. The way the BITX was described
I figured I couldn't lose. Seems to hold true! :-)

I got the board set from Sunil in India. I built up both boards using the
binoc cores, the IF cans (bandpass filter) but I ended up swapping some of
the binoc cores out for regular toroids. I used an MPS110 in the first RX RF
amp. It might be just a touch too hot. I get some distortion on strong
signals. I did that because I wasn't getting much audio and come to find out
I had a bad cap in the audio section. I had to add an extra cap to the BFO
to get the SSB to sound right. Probably just due to my crystals more than
anything else.
When I finally got the main board right then I tackled the PA board and I
had fits with it. I finally just rebuilt it Manhattan style with some extra
shielding around it. It worked FB the first time I fired it up.
http://www.jessystems.com/Images/pa_board-rev1.jpg
My email Elmer, Pete, W6JFR helped me out immensely as this was my first
attempt at something this major. You can see more pictures at that link as
well as Pete's fine homebrew.
Oh almost forgot the VFO is a design by PE1ABE that I had read about in the
BITX archives. It uses a varactor and a ten turn pot (which I had in the
junk box).
Sure was rewarding. Real rewarding.
Now I need to make a freq. counter (planning on using PA2OHH's binary
counter). Oh, my ATU is a Hans Summers design, hombrew as well.
73's
Dan KB9JLO
<><

On 5/10/07, paul daulton <k5wms@...> wrote:

DAN

GIVE US A LITTLE DECRIPTION OF YOUR BITX.



WAS IT DEAD BUG, PC BOARD. AND ANY MODIFICATIONS YOU

INCORPORATED.



YOURS IS AN ACCOMPLISHMENT YOU CAN BE PROUD OF FOR YEARS TO

COME.



PAUL DAULTON K5WM

Re: First Contact

Jason Milldrum <jason@...>
 

Dan,

Congratulations, that's excellent news! I recently had a similar moment, not with the BITX, but with my FDIM Potluck Contest entry. The feeling is really incredible. I've been keeping an eye on your progress since you were mentioned on SolderSmoke. I'm going to have to try to build a BITX pretty soon, since it seems like a lot of people are having so much fun with it.

Jason Milldrum, NT7S
=====
Amateur Station NT7S - <http://www.nt7s.com>
QRPedia - <http://www.qrpedia.com>

Dan Reynolds wrote:

Made my first contact tonight. 20 M is still pretty rough but I finally got
through to someone. I talked to N3KCJ, MA - not bad from IL, after dusk on
20 M now.
I'm doing the happy dance. 73's
Dan KB9JLO
<><

Re: any kit updates?

Chris van den Berg
 

Sure the PA works on 18 MHz, see files>modifications>amplifier stages
BITX17
Also in Photos several pictures of the PA can be found in the BITX17
section.
Best regards,
Chris, PA3CRX

I would be guessing if I said that IRF510s might work well at 18
MHz,
but I'm going to try that very thing in the near future. I will
post my
results here for the BITX20 group.
<snip>

Re: First Contact

Arv Evans
 

Dan

Congratulations! Now you know that all that work was worthwhile. :-)

Arv - K7HKL
_._


Dan Reynolds wrote:


Made my first contact tonight. 20 M is still pretty rough but I
finally got
through to someone. I talked to N3KCJ, MA - not bad from IL, after dusk on
20 M now.

I'm doing the happy dance. 73's

Dan KB9JLO
<><