Date   
Re: AD9851 DDS chip adaptor

Arv Evans
 

Hello

If you do get a solder bridge you can use solder-wick to soak up the excess.
This leaves the pins soldered with no excess solder. It looks quite
professional.

Arv
_._

On 09/28/2011 03:36 PM, n7ve wrote:

For me, I have found solder flux the most important accessory to
soldering these parts by hand using moderately fine solder.

The flux encourages the solder to "bead up", which helps to discourage
solder bridging between adjacent pads. No special equipment needed
other than a "mag-eyes" head set (2x?) to let me see the DDS chip more
clearly.

I got a couple ounces of solder flux from radio shack a couple years
ago and apply it to the pads with a toothpick before placing the DDS
part into place. I have soldered at least 500 9834s in place and have
used about half my solder flux supply.

- Dan, N7VE

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Mark
<huitmarmottes@...> wrote:

Hi Pat,

At work we buy reflow solder paste in small quantities (sorry I
don't have a link handy but you can just google for it) and "reflow"
smd chips by attaching onto the pcb first with small bits of paste
(this is the hardest part) then heating the board on a hot plate.

At home I have a regular inspection type stereo microscope and
solder them by hand with the finest diameter solder and iron tip.Â
It's pretty easy with this equipment.


Â
Mark - N7EKU


________________________________
From: patrick pugh <patrick_pugh2000@...>
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
Sent: Wednesday, September 28, 2011 6:26 AM
Subject: Re: [BITX20] AD9851 DDS chip adaptor


Â
Hi Paul,

I'd like to know how you intend to solder the 9851 to the adapter. I
have the adapter and the 9851 but I'd prolly have to procure an
electron microscope to get the job done. Looks like a homebrew reflow
oven will have to precede this homebrew DDS.

Pat
VU3pat

--- On Wed, 9/28/11, Paul <paul@...> wrote:

From: Paul <paul@...>
Subject: [BITX20] AD9851 DDS chip adaptor
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
Date: Wednesday, September 28, 2011, 2:08 AM

Â

Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's
site. I have made and populated 2 PCB's (one has 2 PIC chips on and
the other is the DDS board) with the exception of the DDS chip which
is tiny.

I want to know if anyone could point me in the right direction to
purchase a ssop to 28pin DIL adaptor PCB.

I have bid and won two on eBay but from China could take weeks to
arrive, I'm want to get this going so was wondering if there was a
quicker way?

Thank you all in advance,

Paul M0EME







Re: AD9851 DDS chip adaptor

n7ve <dan.Tayloe@...>
 

For me, I have found solder flux the most important accessory to soldering these parts by hand using moderately fine solder.

The flux encourages the solder to "bead up", which helps to discourage solder bridging between adjacent pads. No special equipment needed other than a "mag-eyes" head set (2x?) to let me see the DDS chip more clearly.

I got a couple ounces of solder flux from radio shack a couple years ago and apply it to the pads with a toothpick before placing the DDS part into place. I have soldered at least 500 9834s in place and have used about half my solder flux supply.

- Dan, N7VE

--- In BITX20@..., Mark <huitmarmottes@...> wrote:

Hi Pat,

At work we buy reflow solder paste in small quantities (sorry I don't have a link handy but you can just google for it) and "reflow" smd chips by attaching onto the pcb first with small bits of paste (this is the hardest part) then heating the board on a hot plate.

At home I have a regular inspection type stereo microscope and solder them by hand with the finest diameter solder and iron tip.  It's pretty easy with this equipment.


 
Mark - N7EKU


________________________________
From: patrick pugh <patrick_pugh2000@...>
To: BITX20@...
Sent: Wednesday, September 28, 2011 6:26 AM
Subject: Re: [BITX20] AD9851 DDS chip adaptor


 
Hi Paul,

I'd like to know how you intend to solder the 9851 to the adapter. I have the adapter and the 9851 but I'd prolly have to procure an electron microscope to get the job done. Looks like a homebrew reflow oven will have to precede this homebrew DDS.

Pat
VU3pat

--- On Wed, 9/28/11, Paul <paul@...> wrote:

From: Paul <paul@...>
Subject: [BITX20] AD9851 DDS chip adaptor
To: BITX20@...
Date: Wednesday, September 28, 2011, 2:08 AM

 

Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's site. I have made and populated 2 PCB's (one has 2 PIC chips on and the other is the DDS board) with the exception of the DDS chip which is tiny.

I want to know if anyone could point me in the right direction to purchase a ssop to 28pin DIL adaptor PCB.

I have bid and won two on eBay but from China could take weeks to arrive, I'm want to get this going so was wondering if there was a quicker way?

Thank you all in advance,

Paul M0EME







Re: AD9851 DDS chip adaptor

Mark <huitmarmottes@...>
 

Hi Pat,

At work we buy reflow solder paste in small quantities (sorry I don't have a link handy but you can just google for it) and "reflow" smd chips by attaching onto the pcb first with small bits of paste (this is the hardest part) then heating the board on a hot plate.

At home I have a regular inspection type stereo microscope and solder them by hand with the finest diameter solder and iron tip.  It's pretty easy with this equipment.


 
Mark - N7EKU


________________________________
From: patrick pugh <@peterpan73>
To: BITX20@...
Sent: Wednesday, September 28, 2011 6:26 AM
Subject: Re: [BITX20] AD9851 DDS chip adaptor


 
Hi Paul,

I'd like to know how you intend to solder the 9851 to the adapter. I have the adapter and the 9851 but I'd prolly have to procure an electron microscope to get the job done. Looks like a homebrew reflow oven will have to precede this homebrew DDS.

Pat
VU3pat

--- On Wed, 9/28/11, Paul <paul@...> wrote:

From: Paul <paul@...>
Subject: [BITX20] AD9851 DDS chip adaptor
To: BITX20@...
Date: Wednesday, September 28, 2011, 2:08 AM

 

Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's site. I have made and populated 2 PCB's (one has 2 PIC chips on and the other is the DDS board) with the exception of the DDS chip which is tiny.

I want to know if anyone could point me in the right direction to purchase a ssop to 28pin DIL adaptor PCB.

I have bid and won two on eBay but from China could take weeks to arrive, I'm want to get this going so was wondering if there was a quicker way?

Thank you all in advance,

Paul M0EME

Re: AD9851 DDS chip adaptor

JuanCarlos
 

Please can you send me the link to review the information about DDS
I was trying in the Sunil blog but I couldn't.
Thyank You in advance
73's
Jc

2011/9/27 Paul <paul@...>

**


Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's site.
I have made and populated 2 PCB's (one has 2 PIC chips on and the other is
the DDS board) with the exception of the DDS chip which is tiny.
I want to know if anyone could point me in the right direction to purchase
a ssop to 28pin DIL adaptor PCB.
I have bid and won two on eBay but from China could take weeks to arrive,
I'm want to get this going so was wondering if there was a quicker way?

Thank you all in advance,

Paul M0EME




--

Lic.Juan Carlos Berberena Gonzalez
WJ6C exCO6BG
www.berberena.com
http://espanol.groups.yahoo.com/group/cacharreando/


[Non-text portions of this message have been removed]

Re: IK3OIL fll board.

markg6zqs
 

HI and try the following:
http://www.9h1lo.net/fll.php

73, Mark G6ZQS

--- In BITX20@..., patrick pugh <patrick_pugh2000@...> wrote:

Does anyone have the hex code for this project??

Pat

--- On Wed, 9/28/11, G0JKZ <g0jkz@...> wrote:

From: G0JKZ <g0jkz@...>
Subject: RE: [BITX20] Re: IK3OIL fll board.
To: BITX20@...
Date: Wednesday, September 28, 2011, 5:16 AM
















 









Looked there, all he has is the info for 5mhz and up, not for the 4mhz

needed for sunils bitxv3.



It annoys me as I did find the info somewhere, it may even have been an old

post in this group but searching so far has come up with nothing.



I did print it/save it/ bookmark it but I'm frantically searching for the

stuff on 3 computers and a stack of paper in the 'Useful information' box.



George



From: cartronics@... [mailto:cartronics@...]

Sent: 27 September 2011 22:09

To: BITX20@...

Subject: [BITX20] Re: IK3OIL fll board.



Hi George,



Heres a link to his website:

http://www.ik3oil.it/project_eng.htm



Regards .....Peter GW4ZUA



--- In BITX20@... <mailto:BITX20%40yahoogroups.com> , "G0JKZ"

<g0jkz@> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the original
post that detailed the coil and cap values for the 4mhz vfo.
Has anyone got the info to hand please.
George
G0JKZ































Re: IK3OIL fll board.

Patrick Pugh Sawian
 

Does anyone have the hex code for this project??

Pat

--- On Wed, 9/28/11, G0JKZ <g0jkz@...> wrote:

From: G0JKZ <g0jkz@...>
Subject: RE: [BITX20] Re: IK3OIL fll board.
To: BITX20@...
Date: Wednesday, September 28, 2011, 5:16 AM
















 









Looked there, all he has is the info for 5mhz and up, not for the 4mhz

needed for sunils bitxv3.



It annoys me as I did find the info somewhere, it may even have been an old

post in this group but searching so far has come up with nothing.



I did print it/save it/ bookmark it but I'm frantically searching for the

stuff on 3 computers and a stack of paper in the 'Useful information' box.



George



From: cartronics@... [mailto:cartronics@...]

Sent: 27 September 2011 22:09

To: BITX20@...

Subject: [BITX20] Re: IK3OIL fll board.



Hi George,



Heres a link to his website:

http://www.ik3oil.it/project_eng.htm



Regards .....Peter GW4ZUA



--- In BITX20@... <mailto:BITX20%40yahoogroups.com> , "G0JKZ"

<g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the original
post that detailed the coil and cap values for the 4mhz vfo.
Has anyone got the info to hand please.
George
G0JKZ


[Non-text portions of this message have been removed]

Re: AD9851 DDS chip adaptor

Patrick Pugh Sawian
 

Hi Paul,

I'd like to know how you intend to solder the 9851 to the adapter. I have the adapter and the 9851 but I'd prolly have to procure an electron microscope to get the job done. Looks like a homebrew reflow oven will have to precede this homebrew DDS.

Pat
VU3pat

--- On Wed, 9/28/11, Paul <paul@...> wrote:

From: Paul <paul@...>
Subject: [BITX20] AD9851 DDS chip adaptor
To: BITX20@...
Date: Wednesday, September 28, 2011, 2:08 AM
















 









Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's site. I have made and populated 2 PCB's (one has 2 PIC chips on and the other is the DDS board) with the exception of the DDS chip which is tiny.

I want to know if anyone could point me in the right direction to purchase a ssop to 28pin DIL adaptor PCB.

I have bid and won two on eBay but from China could take weeks to arrive, I'm want to get this going so was wondering if there was a quicker way?



Thank you all in advance,



Paul M0EME



























[Non-text portions of this message have been removed]

Re: IK3OIL fll board.

G0JKZ <g0jkz@...>
 

Many thanks for that Arv, I guess I was just being a bit lazy and not being
bothered to work it out properly.



Half the problem will be the fact that I'm using a core that was salvaged
from a computer psu so it isn't a fully known entity. I have a rough idea
what it should be like going by size and colour so I will have to do the
basics and then try it in circuit to see if it behaves as expected As you
say, only if the core is completely different will it make the calculations
totally wrong.



Mark. yes, I knew I had the vfo board from Sunil, I knew I would have to
wind the coil so when I saw the figures for the inductors and capacitors I
just knew I had to save them. Now do like my wife does. 'Put in a safe place
for later', and it turns out so safe nobody can ever find it again!



Thanks for the other link as well. I think I'm going to have to relearn
stuff that I forgot again...



George

G0JKZ



From: Arv Evans [mailto:arvid.evans@...]
Sent: 28 September 2011 02:51
To: BITX20@...
Subject: Re: [BITX20] Re: IK3OIL fll board.





George G0JKZ

Maybe I can help relieve some of the frustration you have expressed?

It is rather easy to scale resonant circuit components up or down in
frequency. The trick is in maintaining the same LC ratio so that RF
impedances will be the same in the new layout as they were in the
original. This is the process that was used with the original BITX20A
to make a BITX17A, BITX30A, BITX40A, BITX80A, BITX160A, and even
a BITX1750A for the US LF experimenter's band.

To make this work you will need to calculate the impedance of each
frequency dependent inductance and capacitance in the original circuit.
Once you have that information documented, you can then calculate
new inductances and capacitances based on the new frequency.

There are many useful L, C, F, and Z calculators available on-line.
I particularly like the one at:

<http://toroids.info/>

but that is just a personal preference because it also tells me how
many turns I need on a particular toroid core to build the new
inductors. It also simultaneously tells me both L and C values for
a specific impedance at a particular frequency.

For example, lets say we have a tuned circuit that works at 5.0 MHz
in it's original configuration, but we want to make that work at 3.75
MHz in a new configuration. If the original network used 64 pf and
16 uh to resonate at 5.0 MHz, the L and C would each have an
impedance of 500 ohms at that frequency. We can prove that by
entering 16 uh and 64 pf into the calculator to get the 500 ohms
impedance for L and C at resonance.

If we want to find the equivalent impedance C-value for 3.75 MHz
we just enter 3.75 MHz and 500 ohms into the calculator and it
shows 85 pf as the new C-value. At the same time it shows the
matching 500 ohm impedance L value to be 21.2 uh.

There are some possible traps to take into account. If the new
inductor is quite different in R-value (wire resistance) or if the
Q-factor of the new inductor core is significantly different, the
bandwidth may be different between old and new configurations.
But in most cases these are not different enough to cause any
significant problems.

Arv K7HKL
_._

On 09/27/2011 05:46 PM, G0JKZ wrote:

Looked there, all he has is the info for 5mhz and up, not for the 4mhz
needed for sunils bitxv3.

It annoys me as I did find the info somewhere, it may even have been
an old
post in this group but searching so far has come up with nothing.

I did print it/save it/ bookmark it but I'm frantically searching for the
stuff on 3 computers and a stack of paper in the 'Useful information' box.

George

From: cartronics@... <mailto:cartronics%40yahoo.com>
<mailto:cartronics%40yahoo.com>
[mailto:cartronics@... <mailto:cartronics%40yahoo.com>
<mailto:cartronics%40yahoo.com>]
Sent: 27 September 2011 22:09
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
<mailto:BITX20%40yahoogroups.com>
Subject: [BITX20] Re: IK3OIL fll board.

Hi George,

Heres a link to his website:
http://www.ik3oil.it/project_eng.htm

Regards .....Peter GW4ZUA

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>
<mailto:BITX20%40yahoogroups.com>
<mailto:BITX20%40yahoogroups.com> , "G0JKZ"
<g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the
IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the
original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ


Re: IK3OIL fll board.

Mark <huitmarmottes@...>
 

Hi George and all,

This is a great link, that illustrates what Arv said in his reply and has a very good explanation of the math used:

http://www.electronics-tutorials.com/oscillators/colpitts-oscillators.htm

Have a great night!

 
Mark - N7EKU


________________________________
From: Arv Evans <arvid.evans@...>
To: BITX20@...
Sent: Tuesday, September 27, 2011 6:50 PM
Subject: Re: [BITX20] Re: IK3OIL fll board.


 
George G0JKZ

Maybe I can help relieve some of the frustration you have expressed?

It is rather easy to scale resonant circuit components up or down in
frequency. The trick is in maintaining the same LC ratio so that RF
impedances will be the same in the new layout as they were in the
original. This is the process that was used with the original BITX20A
to make a BITX17A, BITX30A, BITX40A, BITX80A, BITX160A, and even
a BITX1750A for the US LF experimenter's band.

To make this work you will need to calculate the impedance of each
frequency dependent inductance and capacitance in the original circuit.
Once you have that information documented, you can then calculate
new inductances and capacitances based on the new frequency.

There are many useful L, C, F, and Z calculators available on-line.
I particularly like the one at:

<http://toroids.info/>

but that is just a personal preference because it also tells me how
many turns I need on a particular toroid core to build the new
inductors. It also simultaneously tells me both L and C values for
a specific impedance at a particular frequency.

For example, lets say we have a tuned circuit that works at 5.0 MHz
in it's original configuration, but we want to make that work at 3.75
MHz in a new configuration. If the original network used 64 pf and
16 uh to resonate at 5.0 MHz, the L and C would each have an
impedance of 500 ohms at that frequency. We can prove that by
entering 16 uh and 64 pf into the calculator to get the 500 ohms
impedance for L and C at resonance.

If we want to find the equivalent impedance C-value for 3.75 MHz
we just enter 3.75 MHz and 500 ohms into the calculator and it
shows 85 pf as the new C-value. At the same time it shows the
matching 500 ohm impedance L value to be 21.2 uh.

There are some possible traps to take into account. If the new
inductor is quite different in R-value (wire resistance) or if the
Q-factor of the new inductor core is significantly different, the
bandwidth may be different between old and new configurations.
But in most cases these are not different enough to cause any
significant problems.

Arv K7HKL
_._

On 09/27/2011 05:46 PM, G0JKZ wrote:

Looked there, all he has is the info for 5mhz and up, not for the 4mhz
needed for sunils bitxv3.

It annoys me as I did find the info somewhere, it may even have been
an old
post in this group but searching so far has come up with nothing.

I did print it/save it/ bookmark it but I'm frantically searching for the
stuff on 3 computers and a stack of paper in the 'Useful information' box.

George

From: cartronics@... <mailto:cartronics%40yahoo.com>
[mailto:cartronics@... <mailto:cartronics%40yahoo.com>]
Sent: 27 September 2011 22:09
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
Subject: [BITX20] Re: IK3OIL fll board.

Hi George,

Heres a link to his website:
http://www.ik3oil.it/project_eng.htm

Regards .....Peter GW4ZUA

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>
<mailto:BITX20%40yahoogroups.com> , "G0JKZ"
<g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the
IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the
original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ
[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]




[Non-text portions of this message have been removed]

Re: IK3OIL fll board.

Mark <huitmarmottes@...>
 

George - you sound just like me!

I hate it when I can't find stuff that I so dutifully saved before...  I need a better filing system (just my brain used to be good enough!)



 
Mark - N7EKU


________________________________
From: G0JKZ <g0jkz@...>
To: BITX20@...
Sent: Tuesday, September 27, 2011 4:46 PM
Subject: RE: [BITX20] Re: IK3OIL fll board.


 
Looked there, all he has is the info for 5mhz and up, not for the 4mhz
needed for sunils bitxv3.

It annoys me as I did find the info somewhere, it may even have been an old
post in this group but searching so far has come up with nothing.

I did print it/save it/ bookmark it but I'm frantically searching for the
stuff on 3 computers and a stack of paper in the 'Useful information' box.

George

From: cartronics@... [mailto:cartronics@...]
Sent: 27 September 2011 22:09
To: BITX20@...
Subject: [BITX20] Re: IK3OIL fll board.

Hi George,

Heres a link to his website:
http://www.ik3oil.it/project_eng.htm

Regards .....Peter GW4ZUA

--- In BITX20@... <mailto:BITX20%40yahoogroups.com> , "G0JKZ"
<g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ

Re: IK3OIL fll board.

Arv Evans
 

George G0JKZ

Maybe I can help relieve some of the frustration you have expressed?

It is rather easy to scale resonant circuit components up or down in
frequency. The trick is in maintaining the same LC ratio so that RF
impedances will be the same in the new layout as they were in the
original. This is the process that was used with the original BITX20A
to make a BITX17A, BITX30A, BITX40A, BITX80A, BITX160A, and even
a BITX1750A for the US LF experimenter's band.

To make this work you will need to calculate the impedance of each
frequency dependent inductance and capacitance in the original circuit.
Once you have that information documented, you can then calculate
new inductances and capacitances based on the new frequency.

There are many useful L, C, F, and Z calculators available on-line.
I particularly like the one at:

<http://toroids.info/>

but that is just a personal preference because it also tells me how
many turns I need on a particular toroid core to build the new
inductors. It also simultaneously tells me both L and C values for
a specific impedance at a particular frequency.

For example, lets say we have a tuned circuit that works at 5.0 MHz
in it's original configuration, but we want to make that work at 3.75
MHz in a new configuration. If the original network used 64 pf and
16 uh to resonate at 5.0 MHz, the L and C would each have an
impedance of 500 ohms at that frequency. We can prove that by
entering 16 uh and 64 pf into the calculator to get the 500 ohms
impedance for L and C at resonance.

If we want to find the equivalent impedance C-value for 3.75 MHz
we just enter 3.75 MHz and 500 ohms into the calculator and it
shows 85 pf as the new C-value. At the same time it shows the
matching 500 ohm impedance L value to be 21.2 uh.

There are some possible traps to take into account. If the new
inductor is quite different in R-value (wire resistance) or if the
Q-factor of the new inductor core is significantly different, the
bandwidth may be different between old and new configurations.
But in most cases these are not different enough to cause any
significant problems.

Arv K7HKL
_._

On 09/27/2011 05:46 PM, G0JKZ wrote:

Looked there, all he has is the info for 5mhz and up, not for the 4mhz
needed for sunils bitxv3.

It annoys me as I did find the info somewhere, it may even have been
an old
post in this group but searching so far has come up with nothing.

I did print it/save it/ bookmark it but I'm frantically searching for the
stuff on 3 computers and a stack of paper in the 'Useful information' box.

George

From: cartronics@... <mailto:cartronics%40yahoo.com>
[mailto:cartronics@... <mailto:cartronics%40yahoo.com>]
Sent: 27 September 2011 22:09
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
Subject: [BITX20] Re: IK3OIL fll board.

Hi George,

Heres a link to his website:
http://www.ik3oil.it/project_eng.htm

Regards .....Peter GW4ZUA

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>
<mailto:BITX20%40yahoogroups.com> , "G0JKZ"
<g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the
IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the
original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ


Re: AD9851 DDS chip adaptor

John Backo
 

--- In BITX20@..., "Paul" <paul@...> wrote:

Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's site. I have made and populated 2 PCB's (one has 2 PIC chips on and the other is the DDS board) with the exception of the DDS chip which is tiny.
I want to know if anyone could point me in the right direction to purchase a ssop to 28pin DIL adaptor PCB.
I have bid and won two on eBay but from China could take weeks to arrive, I'm want to get this going so was wondering if there was a quicker way?

Thank you all in advance,

Paul M0EME

http://www.futurelec.com/SMD_Adapters.shtml


john
AD5YE

Re: IK3OIL fll board.

G0JKZ <g0jkz@...>
 

Looked there, all he has is the info for 5mhz and up, not for the 4mhz
needed for sunils bitxv3.



It annoys me as I did find the info somewhere, it may even have been an old
post in this group but searching so far has come up with nothing.



I did print it/save it/ bookmark it but I'm frantically searching for the
stuff on 3 computers and a stack of paper in the 'Useful information' box.



George



From: cartronics@... [mailto:cartronics@...]
Sent: 27 September 2011 22:09
To: BITX20@...
Subject: [BITX20] Re: IK3OIL fll board.





Hi George,

Heres a link to his website:
http://www.ik3oil.it/project_eng.htm

Regards .....Peter GW4ZUA

--- In BITX20@... <mailto:BITX20%40yahoogroups.com> , "G0JKZ"
<g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ

Re: IK3OIL fll board.

cartronics
 

Hi George,

Heres a link to his website:
http://www.ik3oil.it/project_eng.htm

Regards .....Peter GW4ZUA

--- In BITX20@..., "G0JKZ" <g0jkz@...> wrote:

Hi guys... Almost finished my bitx20 and I am putting together the IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ

AD9851 DDS chip adaptor

Paul Tomlinson
 

Hi all, I'm currently building an AD9851 DDS Ver4 as seen on Sunil's site. I have made and populated 2 PCB's (one has 2 PIC chips on and the other is the DDS board) with the exception of the DDS chip which is tiny.
I want to know if anyone could point me in the right direction to purchase a ssop to 28pin DIL adaptor PCB.
I have bid and won two on eBay but from China could take weeks to arrive, I'm want to get this going so was wondering if there was a quicker way?

Thank you all in advance,

Paul M0EME

IK3OIL fll board.

G0JKZ <g0jkz@...>
 

Hi guys... Almost finished my bitx20 and I am putting together the IK3OIL
fll board. I did find details for L1/C5/C9 somewhere a while ago and now
that I need them I can't find either the hard copy I made or the original
post that detailed the coil and cap values for the 4mhz vfo.

Has anyone got the info to hand please.

George
G0JKZ

Re: Problem with construction of Bitx (linear amplifier)

Leonard
 

Using http://golddredgervideo.com/kc0wox/bitxver3new/linear/lineart1detail.gif as a guide, measure the resistance between the pads the red wires are connected to, then measure the green wire pads. They should both be a short.

Next measure between a red pad and a green pad. It should not be a short. It may measure a fairly high resistance though. That should check out the transformer.

Measure the resistance from the base of the transistor to ground. It should measure around 470 ohms. The emitter to ground should measure around 22 ohms.

The collector to ground should ne around 2.67k.

Leonard

--- In BITX20@..., "julian8211" <nyquist_14_bode@...> wrote:

Dear,

I have a problem for the mounting of the Bitx. Specifically with the
linear amplifier.
My problem is with the test on page 6 of the manual assembly.
I have all the correct voltages at the transistor 2n2218.
The pot is fully CCW for a reading of 0 volt at the lower end of the 56
ohm resistor.
But when I inject a signal at 14,250 Mhz to P4 connector with an
amplitude of 1V pk to pk,
the signal voltage at the lower end of the 56 ohm resistor isaround 0.8
V pk to pk.
It's very different from 6V from the manualon the end of page 6.
Do you have an idea of the problem or some ideas to solve the problem?
For now, I'm stuck in my investigations.
I changed the 2n2218 transistor and transformer T1 but the problem is
still there.

As I have a problem at this level, the rest of the assembly of the
linear amplifier is not performed.


Thanks.

Regards

William

Problem with construction of Bitx (linear amplifier)

julian8211
 

Dear,

I have a problem for the mounting of the Bitx. Specifically with the
linear amplifier.
My problem is with the test on page 6 of the manual assembly.
I have all the correct voltages at the transistor 2n2218.
The pot is fully CCW for a reading of 0 volt at the lower end of the 56
ohm resistor.
But when I inject a signal at 14,250 Mhz to P4 connector with an
amplitude of 1V pk to pk,
the signal voltage at the lower end of the 56 ohm resistor isaround 0.8
V pk to pk.
It's very different from 6V from the manualon the end of page 6.
Do you have an idea of the problem or some ideas to solve the problem?
For now, I'm stuck in my investigations.
I changed the 2n2218 transistor and transformer T1 but the problem is
still there.

As I have a problem at this level, the rest of the assembly of the
linear amplifier is not performed.


Thanks.

Regards

William

Re: BitX20A L-7 wire length?

John Backo
 

--- In BITX20@..., Frank <w4nhj@...> wrote:

Kent,

Thanks for the reply. I was very curious as to why your
manual said #36, now I know; newer manual.

The NorCal DDS is available at http://www.norcalqrp.org/
You must buy both the FCC1 and the FCC2 Mark II. My
DDS is the older FCC2 which has a lower frequency range
than the FCC2 Mark II.

I love the rig with the NorCal DDS. It is just like
a commercial made rig. I don't have AGC yet. I think
AGC will make the RXer much better. The NorCal DDS did
not come with a back lite LCD display, this is a real
bummer.

I also built a 140 watt amplifier for it. The parts
came from Communication Concepts. With the amplifier
on, I can usually work anything I can hear.

Good Luck with your BITX, Kent.

Frank - W4NHJ


The NorCal FCC-1 and FCC-2 have been out of stock for some time. Their website says that they may be available in October.

When it is available, the NorCal DDS is an excellent piece of work, but it is (was?) limited to 30 MHz. A hex file is available for the FCC-1 frequency counter (so one can burn another chip), but not for the FCC-2 DDS. I have both and use the counter all the time. Unfortunately, I blew out the DSS microcontroller messing around and have not gotten another. It looks like I can control the AD9834 chip simply with another unit but I have not gotten around to adapting it yet.

Another excellent combination is the WA6UFQ VFO controller and the AmQRP DDS60. The controller is capable of handling AD9850, AD9851, AD9912, AD995x, and Si570 devices (one at a time, of course). The processor is a 16-bit microcontroller and is somewhat better for these DDS chips than an 8-bit processor which most everyone else uses. The hex file is available online and I have successfully burned another chip with it. This is a straight DDS with a few adjustments for IF offset, and nice frequency sweep and scan features as well.

I have both the DDS60 and the Si570 DDS boards, and with this controller I can generate .5-67 MHz with the first, and 3.5-160 MHz with the second.

I also have a few W8DIZ DDS units and they are excellent as well; mine cover .1-38 MHz with a AD9834CRUZ chip. I haven't fiddled much with the source code to see what else I can get, but it is freely available to anyone to do so. The microprocessor is an ATMega88 or ATMega628 directly, but with the source, any of the ATMegas can be adapted. Bruce, W8BH, has done a great adaptation for the ATMega628 which includes keyboard and a keyer as well as the usual inputs. Unfortunately, this kit is no longer available.

I don't know the N3ZI DDS unit. It looks interesting but would probably be somewhat limited like the FCC-2. I have his frequency counter which is good as an indicator for a rig, but is not accurate to more than +- 200 Hz or so. The main thing about these devices is the serial LCD which is a bit bulky. And there is no hex or source code available except through N3ZI.

And, one shouldn't forget the FLL set from IK3OIL via Sunil. This is pretty good, but a bit noisy. And it controls only a rather narrow single VFO, of course. I like it for what it does.

There are a slew of others out there; these are a few that I am familiar with. I have no interest in any of them except as a satisfied customer.

hope this helps.


john
AD5YE

Re: BitX20A L-7 wire length?

redcatradio2000
 

Kent,

Thanks for the reply. I was very curious as to why your
manual said #36, now I know; newer manual.

The NorCal DDS is available at http://www.norcalqrp.org/
You must buy both the FCC1 and the FCC2 Mark II. My
DDS is the older FCC2 which has a lower frequency range
than the FCC2 Mark II.

I love the rig with the NorCal DDS. It is just like
a commercial made rig. I don't have AGC yet. I think
AGC will make the RXer much better. The NorCal DDS did
not come with a back lite LCD display, this is a real
bummer.

I also built a 140 watt amplifier for it. The parts
came from Communication Concepts. With the amplifier
on, I can usually work anything I can hear.

Good Luck with your BITX, Kent.

Frank - W4NHJ

On 9/24/11 7:31 PM, Kent Berglund PhD wrote:
Hi Frank,

I meant to tell you that I am using the Feb. 2, 2008 manual and it did not say how long to cut the wire. It did say: "L-7, 50 turns #36 on T-37-6(yellow) core." The BOM did not identify the what size the wires were. There were three the same size, which were later identified as #28 (red, green and bronze). I measured the diameter with my digital caliper is .36mm, which is supposedly #27 wire?), and the other wire (red), identified as #38 (this is probably a typo), but it's diameter is .22 mm, which is suppose to be #31. That could be #32 wire. I zeroed the caliber before I did each measurement, but I don't know how accurate it is suppose to be.

Anway, that is why I asked the question, and I found out a previous manual says 3' which is close to other calculations. I think just to be safe I will use that number. The 6" they call for on the trifilar coils is spot on. Thanks for chiming in and getting back to me again. It helped me sort out some stuff. Like I told Mark. This is fun and you learn a lot!!

Do you have a reference for the NorCal DDS? It probably no longer available. I guess N3ZI has a DDS that can work. I am going to build the radio as described and then later do some modification.

Thanks again, Frank for your help.

73, Kent KC9LIF

To: BITX20@...
From: w4nhj@...
Date: Sat, 24 Sep 2011 12:17:12 -0400
Subject: Re: [BITX20] BitX20A L-7 wire length?




























Kent,



They say the wire size is not real important, here is

what my manual says for L7:



insatll inductor L7, T37-6, (yellow toroid core), 50T #32.

3 ft of the smaller of the two kinds of red wire.



Yes, they spelled instal with two Ls. My concern is where

did you see #36 wire for L7? My manual is from 11/10/07, so

perhaps there has been a change. I guess I really don't

have to worry about L7 since I am using a NorCal DDS.



Frank - W4NHJ



On 9/24/11 10:59 AM, Mark wrote:

Not bad Kent,
http://toroid.info/ calculator gives 27" so your 23" plus a couple
inches fudge factor on each side comes up with the same number :-)
I guess a more accurate calc for a toroid (since they are
semi-rectangular cross section) would be:
(2 x height + 2 x width) x 50turns
(2 x 0.19" + 2 x ~0.1") x 50turns = 29" (the rounded corners makes it
so you need less actually)
The "wind 10 turns on the core then measure and divide by 10 then
times by number of turns" method is most accurate of all since it
accounts for variations in toroid manufacture; but if you like
measuring more than winding then a caluclation is easier hi hi.
Cheers to all and have a great day,
Mark - N7EKU
________________________________
From: Kent Berglund PhD<kbergphd@...
<mailto:kbergphd%40hotmail.com>>
To: bitx20@...<mailto:bitx20%40yahoogroups.com>
Sent: Saturday, September 24, 2011 3:37 AM
Subject: RE: [BITX20] BitX20A L-7 wire length?
Thanks Frank and Mark. Jr. High Geometry was a long time ago for me
but it says 23 inches. :)
Kent KC9LIF
To: BITX20@...<mailto:BITX20%40yahoogroups.com>
From: huitmarmottes@...<mailto:huitmarmottes%40yahoo.com>
Date: Fri, 23 Sep 2011 21:04:20 -0700
Subject: Re: [BITX20] BitX20A L-7 wire length?
Or don't forget jr. high geometry class!
Circumference = Pi x Diameter
So 50turns x Pi x Diameter of form plus a little extra will get you
close enough!
Mark - N7EKU
________________________________
From: Frank<w4nhj@...<mailto:w4nhj%40comcast.net>>
To: BITX20@...<mailto:BITX20%40yahoogroups.com>
Sent: Friday, September 23, 2011 7:49 PM
Subject: Re: [BITX20] BitX20A L-7 wire length?
Kent,
My BITX20A manual says 50 turns of #32 3 ft.
Frank - W4NHJ
On 9/23/11 10:13 PM, kc9lif wrote:
Hi Everyone,
Ready to wrap wire on L-7. The manual doesn't say how much wire to
use? Anybody help with how much of the #36 wire I should cut off for
this coil. Thanks.
73, Kent KC9LIF


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