Date   
Re: Board size?

john_kb7nrn <johnandlorna@...>
 

Arv,
Thanks for the measurements.
I have an extruded aluminum case with outside dimensions of 5.5"w x 2"h
x 7.5"d. Inside hight is 1 13/16", with a width of 5 5/16", that should
be enough for all the front panel controls. It also has grooves on the
inside walls for sliding circuit boards into. The widest board you
could fit into the grooves is 5 5/16". I wonder if the board could be
trimmed down on the edges to make it fit?

I'm considering a fan but want to use this for backpacking and was
concerned with the drain on the batteries. How would mounting the
finals to the amuminum case work? Power will be from ten high cap NiMh
cells.

Has anyone used an HT speaker mic on the BITX yet? I'd like to use the
Icom IC-HM9, the little round one used on the 2AT and other HTs. I
remember reading Icom mics were different then other mfgs mics. Or was
that just HF rigs?

John
KB7NRN

--- In BITX20@..., Arv Evans <arvid.evans@...> wrote:

John

The heat sinks stick up 1 inch above the board. You probably want
some
extra space above that for air circulation, and to allow for a decent
sized front panel. If you are going to add a small fan, you will
need
to allow for that as well.

Arv
_._

Re: Board size?

Arv Evans
 

John

The heat sinks stick up 1 inch above the board. You probably want some
extra space above that for air circulation, and to allow for a decent
sized front panel. If you are going to add a small fan, you will need
to allow for that as well.

Arv
_._


john_kb7nrn wrote:


Arv & others,
OK, so the board is 3.5" x 5.5" but with RF transisitors installed it
is how high?

John

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Arv
Evans <arvid.evans@...> wrote:

3.5 inches X 5.5 inches.
_._


john_kb7nrn wrote:

I just ordered the Hendricks Bitx20 kit.
I'm sourcing an enclosure for it and would like to know the size
of

.




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Re: Board size?

john_kb7nrn <johnandlorna@...>
 

Arv & others,
OK, so the board is 3.5" x 5.5" but with RF transisitors installed it
is how high?

John

--- In BITX20@..., Arv Evans <arvid.evans@...> wrote:

3.5 inches X 5.5 inches.
_._


john_kb7nrn wrote:

I just ordered the Hendricks Bitx20 kit.
I'm sourcing an enclosure for it and would like to know the size
of

.




Re: Board size?

Arv Evans
 

3.5 inches X 5.5 inches.
_._


john_kb7nrn wrote:


I just ordered the Hendricks Bitx20 kit.
I'm sourcing an enclosure for it and would like to know the size of

.

Re: Manhatten Layout??

Arv Evans
 

Jerry NR5A

Manhattan or Ugly Construction methods by their very nature do not lend
themselves well to design of one "right way" to build a complex
circuit. The advantage of these methods is that it allows use of many
different sizes and shapes of components, and to do the layout in a way
that the individual builder visualizes the circuit.

Some Manhattan builders will arrange components pretty much the same as
the schematic, usually using "insulated pads" of PCB material for
tie-points. Others will do more Manhattan skyscraper type layouts with
parts supported on the leads of other parts and stacked several layers
deep on the PCB.

The easiest way for a first circuit is probably to lay out your circuit
pretty much the same as the schematic. This uses a lot of substrata
space, but is easiest to understand, and easiest to troubleshoot if
there are problems.

There are a number of Ugly or Manhattan construction tutorials available
on the Internet:

<http://www.qrp.pops.net/ugly.asp>

<http://www.qsl.net/k9gdt/radio/comments.html>

<http://web.telia.com/~u85920178/blocks/deadbug_0.htm>

<http://w7zoi.net/bboard.pdf>

And, there are many more like this available on various ham web sites.

Ugly Construction or Manhattan Constructed versions of the BITX20 have
been built on one PCB substrata, on multiple sub-section boards, and in
very modular arrangements. Each version has it's own good and bad points.

My suggestion would be to build your Ugly-constructed BITX20 one section
at a time, starting with the receive audio section, then the microphone
amplifier. This way you can test each section before you go on to the
next stage. Done this way you get some sense of accomplishment as you
see each section become operational without having to wait until the
whole project is finished to do your testing and alignment.

Arv
_._


jfelts13 wrote:


Are there any files, diagrams that show the layout of parts for the
BTX-20 using Manhatten style building?? I want to build one using
this style construction but I'm lost on where or how to start. I need
examples.

Jerry - NR5A - South Dakota

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http://bitx20a.livejournal.com
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http://www.geocities.com/k7hkl_arv/
======================================

Board size?

john_kb7nrn <johnandlorna@...>
 

I just ordered the Hendricks Bitx20 kit.
I'm sourcing an enclosure for it and would like to know the size of
the board with the RF transistors.

Thanks,
John
KB7NRN

Manhatten Layout??

jfelts13 <NR5AJerry@...>
 

Are there any files, diagrams that show the layout of parts for the
BTX-20 using Manhatten style building?? I want to build one using
this style construction but I'm lost on where or how to start. I need
examples.

Jerry - NR5A - South Dakota

Another R21 victim!

Leonard <bitx@...>
 

If you assembled your kit and it seems to be insensitive on receive
and you can't get at least 1 volt of RF on the right side of R83,
check the value of R21. It should be 1k but earlier versions on the
assembly manual listed it as 10 ohms. I just found my 2nd kit board
with the 10 ohm resistor in it.

It took me longer this time to find it than last time because last
time I started at the antenna and worked through the receiver
towards the speaker. You find it right away using this method
because the Q5 stage doesn't give you any gain and the dc values on
the base are completely wrong.

This time though, I started with the transmitter doing an alignment
and I had a little over 100mv's of 14 MHz coming out of the mixer at
C25 but only had about 100 mv's coming out of Q4. All of the dc
values were correct but it had no gain. I found it after I had
checked all of the Q4 components and in desperation pulled C24 and
C29. When I pulled C29 and the signal voltage out of Q4 jumped to
about 1.5 volts, which was right. R21 being 10 ohms instead on 1k
was loadeding Q4 way down.


Long story short, if you can't get the receive or transmit to work,
check R21. It should be 1k.
Leonard

Re: antenna and baluns

Ashish
 

Can I use the TV antenna balun?

Re: low volume

Ashish
 

Now I aam able to get some short wave stations...
how to tune to ham band?
should I change the number of turns in VFO coil?

New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /BITX17/BITX17 Exciter.GIF
Uploaded by : stangri.geo <stanley@...>
Description : Exciter for 17M PSK31 Beacon

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/BITX17/BITX17%20Exciter.GIF

To learn more about file sharing for your group, please visit:
http://help.yahoo.com/l/us/yahoo/groups/original/members/web/index.htmlfiles

Regards,

stangri.geo <stanley@...>

Re: pcb board layoutab

hello <ag8o1@...>
 

THANKS A LOT LARRY AG8O

----- Original Message -----
From: wb7dmx
To: BITX20@...
Sent: Sunday, May 04, 2008 12:00 PM
Subject: [BITX20] Re: pcb board layoutab


--- In BITX20@..., "xalunt" <ag8o1@...> wrote:
>
> message to wb7dmx about iron on transfer
>

ok, here is what I did.

go to files.

go to bitx20 v1,2,and 3.

go to v3 pcb double sidded

go to track v3 double sided .pdf

print the file

scan the file and save as a jpeg

open the file with paint shop pro

resize the image and print it

check with a ic socket to be sure the pins line up correctly, if
not, then resize the image till the pins line up good.

then save the image and then print it for what ever method of
transfering you want.
you can also mirroe the image for iron on or transperency photo
process, its your choice.

the deminsions are also given in the file on the same page as dimmv3
you only need the bottom layer track as I am doing it, the top layer
is just a ground plane, and I don't think it is needed unless you
wand to do the double sidded board.

mine is single sided for noe.

hope this helps.

bob
WB7DMX

Re: pcb board layoutab

wbdmxbaileybobbuttercup
 

--- In BITX20@..., "xalunt" <ag8o1@...> wrote:

message to wb7dmx about iron on transfer
ok, here is what I did.

go to files.

go to bitx20 v1,2,and 3.

go to v3 pcb double sidded

go to track v3 double sided .pdf

print the file

scan the file and save as a jpeg

open the file with paint shop pro

resize the image and print it

check with a ic socket to be sure the pins line up correctly, if
not, then resize the image till the pins line up good.

then save the image and then print it for what ever method of
transfering you want.
you can also mirroe the image for iron on or transperency photo
process, its your choice.

the deminsions are also given in the file on the same page as dimmv3
you only need the bottom layer track as I am doing it, the top layer
is just a ground plane, and I don't think it is needed unless you
wand to do the double sidded board.

mine is single sided for noe.

hope this helps.

bob
WB7DMX

pcb board layoutab

xalunt <ag8o1@...>
 

message to wb7dmx about iron on transfer

pc board layout

xalunt <ag8o1@...>
 

where did you get pc board layout to iron on

Antenna Filter

m5poo <m5poo@...>
 

I have a BITX20 V1.3 dated 7/10/07 (probably US format date).
Connecting an aerial to the input of the Rx directly, after the antenna
filter and switching, gives good signals. Connecting the aerial to the
actual PCB aerial input gives poor signals. I've checked all the parts
are correct and that there are no shorts. Feeding a generator signal
in and monitoring the actual Rx input gives a peak at around 10MHz and
then another at 15.5MHz i.e. both outside the 14MHz band.

Can anyone help me with this?

Thanks - Simon

Re: antenna and baluns

Frank Lettang
 

I'm thinking of using this wire dipole from MFJ.  It's a center fed dipole that is fed by a ladder line, and probably has a balun to for connection to coax.  Here's a link:
http://www.universal-radio.com/catalog/hamwire/3004.html
It seems like it would cost about $30 to build one of these.

----- Original Message ----
From: Ashish <geniusashish85@...>
To: BITX20@...
Sent: Thursday, April 24, 2008 2:58:56 AM
Subject: [BITX20] antenna and baluns


I nearly completed building my Bitx.Its on a copper clad board.
Now i need an antenna for my bitx.Can any one suggest me an easy to
make dipole antenna?And also how to make it 50 ohm load?Is there any
thing like a balun needed for connecting the antenna to bitx?
Or will the antenna itself be matched to the tranceiver?




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Re: New BitX20a kit owner

RONALD WAITS
 

Hi Tom,

This is completely off subject, but I don't know of any other way of contacting you.
As you also live in Kansas, just a short distance from Wichita, are you any relation to a friend of mine here in Wichita who passed away recently. He was an Attorney and his name is Daniel Sevart. We were friends for 25 plus years. If you have another email address, I will write to you about him using it.

Thanking you in advance,


73's

Ron Waits
kc0les
Wichita, KS.


Tom Sevart <n2uhc@...> wrote:

--- st2nh wrote:




welcome Tom , N2UHC to bitx fun

i use a cheap chinese PC mic , and it's FB mic
pushing only 5 watts , i got a nice audio reports.
have fun Tom
I've also considered using a speaker mic for an HT,
which if works I could also use a headset with hand
PTT control. But right now I'm not ruling anything
out. I also have an old Nokia bag phone which has a
nice aluminum case that I was thinking of mounting the
board into. It would be neat if I could use the
handset with the BitX. But I think I'll probably
just use the CB case.


Tom Sevart N2UHC
Frontenac, KS
http://www.geocities.com/n2uhc


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Re: board sucessful

wbdmxbaileybobbuttercup
 

its the same file, you just need to do some adjusting to get the deminsions correct, I used a ic socket and keep adjusting untill it printed out correct size that the ic pins matched.


To: BITX20@...: ag8o1@...: Sat, 3 May 2008 10:54:26 -0700Subject: Re: [BITX20] board sucessful

where did u get the layout to etch???????----- Original Message ----- From: wb7dmx To: BITX20@... Sent: Monday, April 28, 2008 4:26 AMSubject: [BITX20] board sucessfulwell I finely got the bitx20 ver 3 board made, now to drill a lot of small holes.






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Re: board sucessful

hello <ag8o1@...>
 

where did u get the layout to etch???????

----- Original Message -----
From: wb7dmx
To: BITX20@...
Sent: Monday, April 28, 2008 4:26 AM
Subject: [BITX20] board sucessful


well I finely got the bitx20 ver 3 board made, now to drill a lot of
small holes.