Date   
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.

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: 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: 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: 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

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

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: IK3OIL fll board.

John Backo
 

--- 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


www.9H1LO.net/fll.php



john
AD5YE

Re: IK3OIL fll board.

Patrick Pugh Sawian
 

Thanks a ton Mark. :-)

73ees,
Pat
VU3PAT

--- On Wed, 9/28/11, mark <mpcharlton@...> wrote:

From: mark <mpcharlton@...>
Subject: [BITX20] Re: IK3OIL fll board.
To: BITX20@...
Date: Wednesday, September 28, 2011, 7:31 PM
















 









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


























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

Re: Problem with construction of Bitx (linear amplifier)

julian8211
 

Hi,

I performed the tests that you have suggested :
* the resistance from the base of the transistor to ground : 460 ohms
* the resistance from the emitter of the transistor to ground : 22 ohms
* the resistance from the collector of the transistor to ground : 2,14 Kohms.

For the transformer :
* resistance between a red pad and a red pad : 0 ohms
* resistance between a green pad and a green pad : 0 ohms
* resistance between a red pad and a green pad : 0 ohms. (it's normal because the red wire and the green wire are connected together.)

Thanks

Regards

William

--- In BITX20@..., "LeonardL" <dredger@...> wrote:

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

Re: Problem with construction of Bitx (linear amplifier)

Leonard
 

Everything looks pretty normal. With the board in transmit, what is the B, E, and C voltages on the 2n2218?

Also verify that the collector tab is oriented as shown in http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg

Leonard

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


Hi,

I performed the tests that you have suggested :
* the resistance from the base of the transistor to ground : 460 ohms
* the resistance from the emitter of the transistor to ground : 22 ohms
* the resistance from the collector of the transistor to ground : 2,14 Kohms.

For the transformer :
* resistance between a red pad and a red pad : 0 ohms
* resistance between a green pad and a green pad : 0 ohms
* resistance between a red pad and a green pad : 0 ohms. (it's normal because the red wire and the green wire are connected together.)

Thanks

Regards

William
--- In BITX20@..., "LeonardL" <dredger@> wrote:

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

manual and free download BINGO -STAR 3 bandes

bernard mourot
 

In the Files BITX 20 grup is :

BINGO STAR SSB TRI-Bandes and Links for free Download The MANUEL

Schematic, Color photos, all for Hombrewer, complet

VFO is PA0KLT synthetiseur SI570 from SDR-KITS

73

F6BCU

Re: Problem with construction of Bitx (linear amplifier)

julian8211
 

Hi,

With the board in transmit :

B voltage : 1,99 V
E voltage : 1,38 V
C voltage : 12,14 V

And the collector tab is oriented as shown in http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg

I changed the transistor twice and the problem is still there.
Is it normal that the transistor gets hot? I made a measurement with a thermometer on top of the transistor: around of 60 degrees Celsius.

Thanks

Regards

William

--- In BITX20@..., "LeonardL" <dredger@...> wrote:



Everything looks pretty normal. With the board in transmit, what is the B, E, and C voltages on the 2n2218?

Also verify that the collector tab is oriented as shown in http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg

Leonard



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


Hi,

I performed the tests that you have suggested :
* the resistance from the base of the transistor to ground : 460 ohms
* the resistance from the emitter of the transistor to ground : 22 ohms
* the resistance from the collector of the transistor to ground : 2,14 Kohms.

For the transformer :
* resistance between a red pad and a red pad : 0 ohms
* resistance between a green pad and a green pad : 0 ohms
* resistance between a red pad and a green pad : 0 ohms. (it's normal because the red wire and the green wire are connected together.)

Thanks

Regards

William
--- In BITX20@..., "LeonardL" <dredger@> wrote:

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

Re: Problem with construction of Bitx (linear amplifier)

Leonard
 

Your voltages all seem to be in the ballpark. It's getting to the "grabbibg at straws" point.

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

Hi,

With the board in transmit :

B voltage : 1,99 V
E voltage : 1,38 V
C voltage : 12,14 V


And the collector tab is oriented as shown in http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg
The tab is the emitter. Make sure the tab lead is goint to the 22 ohm resistor.

I changed the transistor twice and the problem is still there.
Is it normal that the transistor gets hot? I made a measurement with a thermometer on top of the transistor: around of 60 degrees Celsius.
It shouldn't run hot at all. Measure the voltage drop across the 22 ohm resistor that is above and to the left of T1on the schematic at http://golddredgervideo.com/kc0wox/bitxver3new/linear/linearschematicup.gif It shouldn't be very much as you have 12.14 on the collector. Place the - lead of the meter on thw bottom of the 22 ohm and the + lead on the top of the resistor. Using that voltage we can plug into ohms law and calculate the current being drawn by the transistor.

Lets look at your testing procedure.

What kind of scope do you have and are you using a x10 probe?

What are you using for a signal generator? Can you measure the input to the amp with your scope when you have the linear connected to the board?

Leonard

BINGO

KC2UKU ED
 

Hi all I'm looking for English translation for Transceiver Bingo Star SSB tri-band I would like a whole construction manual in a PDF file the file that is not in English can any one Help.

Re: Problem with construction of Bitx (linear amplifier)

larry <ag8o1@...>
 

has anyone heard from sunil???????????
i have a kit coming from him and the last i heard he was away to return soon ...that was over 2 months ago larry

----- Original Message -----
From: LeonardL
To: BITX20@...
Sent: Thursday, September 29, 2011 3:23 PM
Subject: [BITX20] Re: Problem with construction of Bitx (linear amplifier)



Your voltages all seem to be in the ballpark. It's getting to the "grabbibg at straws" point.

--- In BITX20@..., "julian8211" <nyquist_14_bode@...> wrote:
>
> Hi,
>
> With the board in transmit :
>
> B voltage : 1,99 V
> E voltage : 1,38 V
> C voltage : 12,14 V
>

> And the collector tab is oriented as shown in http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg
>

The tab is the emitter. Make sure the tab lead is goint to the 22 ohm resistor.

> I changed the transistor twice and the problem is still there.
> Is it normal that the transistor gets hot? I made a measurement with a thermometer on top of the transistor: around of 60 degrees Celsius.
>

It shouldn't run hot at all. Measure the voltage drop across the 22 ohm resistor that is above and to the left of T1on the schematic at http://golddredgervideo.com/kc0wox/bitxver3new/linear/linearschematicup.gif It shouldn't be very much as you have 12.14 on the collector. Place the - lead of the meter on thw bottom of the 22 ohm and the + lead on the top of the resistor. Using that voltage we can plug into ohms law and calculate the current being drawn by the transistor.

Lets look at your testing procedure.

What kind of scope do you have and are you using a x10 probe?

What are you using for a signal generator? Can you measure the input to the amp with your scope when you have the linear connected to the board?

Leonard

Re: Problem with construction of Bitx (linear amplifier)

Gary Marklund <gary.kj7rt@...>
 

I placed an order for a pair of vu meters from him a few weeks ago. They
arrived a few days ago.
Gary

73,

Gary KJ7RT
Sun City, AZ
Fists #14460 NAQCC #3709



On Fri, Sep 30, 2011 at 10:14 AM, larry <ag8o1@...> wrote:

**


has anyone heard from sunil???????????
i have a kit coming from him and the last i heard he was away to return
soon ...that was over 2 months ago larry


----- Original Message -----
From: LeonardL
To: BITX20@...
Sent: Thursday, September 29, 2011 3:23 PM
Subject: [BITX20] Re: Problem with construction of Bitx (linear amplifier)

Your voltages all seem to be in the ballpark. It's getting to the "grabbibg
at straws" point.

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

Hi,

With the board in transmit :

B voltage : 1,99 V
E voltage : 1,38 V
C voltage : 12,14 V
And the collector tab is oriented as shown in
http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg
The tab is the emitter. Make sure the tab lead is goint to the 22 ohm
resistor.

I changed the transistor twice and the problem is still there.
Is it normal that the transistor gets hot? I made a measurement with a
thermometer on top of the transistor: around of 60 degrees Celsius.
It shouldn't run hot at all. Measure the voltage drop across the 22 ohm
resistor that is above and to the left of T1on the schematic at
http://golddredgervideo.com/kc0wox/bitxver3new/linear/linearschematicup.gifIt shouldn't be very much as you have 12.14 on the collector. Place the -
lead of the meter on thw bottom of the 22 ohm and the + lead on the top of
the resistor. Using that voltage we can plug into ohms law and calculate the
current being drawn by the transistor.

Lets look at your testing procedure.

What kind of scope do you have and are you using a x10 probe?

What are you using for a signal generator? Can you measure the input to the
amp with your scope when you have the linear connected to the board?

Leonard

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



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

Re: Problem with construction of Bitx (linear amplifier)

larry <ag8o1@...>
 

he womt answer his email im sure i have it right

----- Original Message -----
From: "Gary Marklund" <gary.kj7rt@...>
To: <BITX20@...>
Sent: Friday, September 30, 2011 11:19 AM
Subject: Re: [BITX20] Re: Problem with construction of Bitx (linear amplifier)


I placed an order for a pair of vu meters from him a few weeks ago. They
arrived a few days ago.
Gary

73,

Gary KJ7RT
Sun City, AZ
Fists #14460 NAQCC #3709



On Fri, Sep 30, 2011 at 10:14 AM, larry <ag8o1@...> wrote:

**


has anyone heard from sunil???????????
i have a kit coming from him and the last i heard he was away to return
soon ...that was over 2 months ago larry


----- Original Message -----
From: LeonardL
To: BITX20@...
Sent: Thursday, September 29, 2011 3:23 PM
Subject: [BITX20] Re: Problem with construction of Bitx (linear amplifier)

Your voltages all seem to be in the ballpark. It's getting to the "grabbibg
at straws" point.

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

Hi,

With the board in transmit :

B voltage : 1,99 V
E voltage : 1,38 V
C voltage : 12,14 V
And the collector tab is oriented as shown in
http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg
The tab is the emitter. Make sure the tab lead is goint to the 22 ohm
resistor.

I changed the transistor twice and the problem is still there.
Is it normal that the transistor gets hot? I made a measurement with a
thermometer on top of the transistor: around of 60 degrees Celsius.
It shouldn't run hot at all. Measure the voltage drop across the 22 ohm
resistor that is above and to the left of T1on the schematic at
http://golddredgervideo.com/kc0wox/bitxver3new/linear/linearschematicup.gifIt shouldn't be very much as you have 12.14 on the collector. Place the -
lead of the meter on thw bottom of the 22 ohm and the + lead on the top of
the resistor. Using that voltage we can plug into ohms law and calculate the
current being drawn by the transistor.

Lets look at your testing procedure.

What kind of scope do you have and are you using a x10 probe?

What are you using for a signal generator? Can you measure the input to the
amp with your scope when you have the linear connected to the board?

Leonard







------------------------------------

Yahoo! Groups Links


Re: Problem with construction of Bitx (linear amplifier)

larry <ag8o1@...>
 

iant his mail gmail? i grt failure evrytime larry

----- Original Message -----
From: larry
To: BITX20@...
Sent: Friday, September 30, 2011 12:34 PM
Subject: Re: [BITX20] Re: Problem with construction of Bitx (linear amplifier)



he womt answer his email im sure i have it right
----- Original Message -----
From: "Gary Marklund" <gary.kj7rt@...>
To: <BITX20@...>
Sent: Friday, September 30, 2011 11:19 AM
Subject: Re: [BITX20] Re: Problem with construction of Bitx (linear
amplifier)

>I placed an order for a pair of vu meters from him a few weeks ago. They
> arrived a few days ago.
> Gary
>
> 73,
>
> Gary KJ7RT
> Sun City, AZ
> Fists #14460 NAQCC #3709
>
>
>
> On Fri, Sep 30, 2011 at 10:14 AM, larry <ag8o1@...> wrote:
>
>> **
>>
>>
>> has anyone heard from sunil???????????
>> i have a kit coming from him and the last i heard he was away to return
>> soon ...that was over 2 months ago larry
>>
>>
>> ----- Original Message -----
>> From: LeonardL
>> To: BITX20@...
>> Sent: Thursday, September 29, 2011 3:23 PM
>> Subject: [BITX20] Re: Problem with construction of Bitx (linear
>> amplifier)
>>
>> Your voltages all seem to be in the ballpark. It's getting to the
>> "grabbibg
>> at straws" point.
>>
>> --- In BITX20@..., "julian8211" <nyquist_14_bode@...> wrote:
>> >
>> > Hi,
>> >
>> > With the board in transmit :
>> >
>> > B voltage : 1,99 V
>> > E voltage : 1,38 V
>> > C voltage : 12,14 V
>> >
>>
>> > And the collector tab is oriented as shown in
>> http://golddredgervideo.com/kc0wox/bitxver3new/linear/bitxlinear.jpg
>> >
>>
>> The tab is the emitter. Make sure the tab lead is goint to the 22 ohm
>> resistor.
>>
>> > I changed the transistor twice and the problem is still there.
>> > Is it normal that the transistor gets hot? I made a measurement with a
>> thermometer on top of the transistor: around of 60 degrees Celsius.
>> >
>>
>> It shouldn't run hot at all. Measure the voltage drop across the 22 ohm
>> resistor that is above and to the left of T1on the schematic at
>> http://golddredgervideo.com/kc0wox/bitxver3new/linear/linearschematicup.gifIt
>> shouldn't be very much as you have 12.14 on the collector. Place the -
>> lead of the meter on thw bottom of the 22 ohm and the + lead on the top
>> of
>> the resistor. Using that voltage we can plug into ohms law and calculate
>> the
>> current being drawn by the transistor.
>>
>> Lets look at your testing procedure.
>>
>> What kind of scope do you have and are you using a x10 probe?
>>
>> What are you using for a signal generator? Can you measure the input to
>> the
>> amp with your scope when you have the linear connected to the board?
>>
>> Leonard
>>
>>
>>
>>
>>
>
>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

PA in BITX40 version 1

Aldrich <aldrich.sarmiento@...>
 

Hello, I'm finishing a transceiver BITX40 version 1, and I have doubts about the T1 transformer of power amplifier, says he has 3uH inductance. For the 40 meter band has to be 6uH?