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Ferrite cores
Hi all
I have been reading through the threads and have found that there are
several Ferrite cores suggested fortunately I have them all ...
FT 37 - 43
T 50 - 6
T 50 - 2
BUT can anyone sugest and
Hi all
I have been reading through the threads and have found that there are
several Ferrite cores suggested fortunately I have them all ...
FT 37 - 43
T 50 - 6
T 50 - 2
BUT can anyone sugest and
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By Charles Darley
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Ferrite cores (and a bit of a rant)
You should take a look at Amidon's (or other vendor's) specifications
for cores. For a given composition, induction can be estimated from
the specs and then confirmed from the actual wound inductor
You should take a look at Amidon's (or other vendor's) specifications
for cores. For a given composition, induction can be estimated from
the specs and then confirmed from the actual wound inductor
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By
Jim Strohm
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Constructing BITX20 2 messages
Hi. Please may I introduce myself to the group. I am G0UCP. I am not
a market gardener.
Relieved to hear that Ashhar only detained by weddings.
Have built the O.P. mic. and B.F.O. stages (including Q
Hi. Please may I introduce myself to the group. I am G0UCP. I am not
a market gardener.
Relieved to hear that Ashhar only detained by weddings.
Have built the O.P. mic. and B.F.O. stages (including Q
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By
market10gardener
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Bi-Directional amp PCB uploaded to Yahoo
Ok, so I've uploaded the file to...
http://groups.yahoo.com/group/BITX20/files/G8NXD/
I've renamed it to "one_bidir_pcb.zip"
There are going to be other modules and hopefully a complete BITX
PCB,
Ok, so I've uploaded the file to...
http://groups.yahoo.com/group/BITX20/files/G8NXD/
I've renamed it to "one_bidir_pcb.zip"
There are going to be other modules and hopefully a complete BITX
PCB,
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By
Mike W
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MODs List...
A file has been added to <BITX/FILES/MODIFICATIONS/List...>
representing a quick collection of most of the ideas for BITX
modifications that have appeared thus far on the forum.
I hope this will st
A file has been added to <BITX/FILES/MODIFICATIONS/List...>
representing a quick collection of most of the ideas for BITX
modifications that have appeared thus far on the forum.
I hope this will st
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By
Arvid Evans
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Ferrite cores
Hi All
And thank you for the reply ... I am all up
for experimentation and the BRATS club in UK now has 5 set under construction
some much slower than others as they have to buy the parts from po
Hi All
And thank you for the reply ... I am all up
for experimentation and the BRATS club in UK now has 5 set under construction
some much slower than others as they have to buy the parts from po
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By Charles Darley
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The case of the missing fried torroid...
...in which your correspondent waits for the family to sleep then
fruitlessly searches his QTH high and low for the notable iron ring with
it's somewhat impaired yellow paint job, in order to break it
...in which your correspondent waits for the family to sleep then
fruitlessly searches his QTH high and low for the notable iron ring with
it's somewhat impaired yellow paint job, in order to break it
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By
Hans Summers
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Fried torroids (loss datasheet)
Hi!
Here is link giving more detailed core loss versus frequency data for various cores.
http://www.micrometals.com/materials_index.html
73
Rahul VU3WJM
Ashhar Farhan wrote:
Do
Hi!
Here is link giving more detailed core loss versus frequency data for various cores.
http://www.micrometals.com/materials_index.html
73
Rahul VU3WJM
Ashhar Farhan wrote:
Do
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By Rahul Srivastava
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Fried torroids 7 messages
Fried torroids
Well just thought I had to add my own contribution on this topic...
In my BITX20 I have used 1/2 inch black plastic tapwashers from the local hardware store. I also had purch
Fried torroids
Well just thought I had to add my own contribution on this topic...
In my BITX20 I have used 1/2 inch black plastic tapwashers from the local hardware store. I also had purch
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By
Ashhar Farhan
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BITX Modifications
All
A little more inforamation has been added to the
BITX20/FILES/MODIFICATIONS/... section of this forum.
Please feel free to add your own ideas as well.
Anything that you add should be somehow r
All
A little more inforamation has been added to the
BITX20/FILES/MODIFICATIONS/... section of this forum.
Please feel free to add your own ideas as well.
Anything that you add should be somehow r
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By
Arvid Evans
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US AWARD / FIRST PRIZE FOR VU2ITI PROF TK MANI 3 messages
Dear friends,
It is a pleasure to inform you all that VU2ITI Prof TK.Mani had won (first price) PICtail Design Contest sponsored by MICROCHIP Inc, recently. The contest was to design and
Dear friends,
It is a pleasure to inform you all that VU2ITI Prof TK.Mani had won (first price) PICtail Design Contest sponsored by MICROCHIP Inc, recently. The contest was to design and
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By
bal sun
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Made the first QSO with my BITX17, detail pictures added
Hi,
as mentioned before, I am building the BITX20 for the 18MHz band (so
it becomes a BITX17 I guess).
The IF filter is made of x-tals of 4.9152 MHz, because I have many
of them. The VFO is changed
Hi,
as mentioned before, I am building the BITX20 for the 18MHz band (so
it becomes a BITX17 I guess).
The IF filter is made of x-tals of 4.9152 MHz, because I have many
of them. The VFO is changed
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By Chris van den Berg
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Bi lateral amps - impedances 3 messages
In practice the arrangement works fine but I'm a
little concerned about the input and output impedances (50 ohms and 200 ohms
respectively) of these amps and the effect particularly on the filter
term
In practice the arrangement works fine but I'm a
little concerned about the input and output impedances (50 ohms and 200 ohms
respectively) of these amps and the effect particularly on the filter
term
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By
Ashhar Farhan
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Position of components
Please, help me, I drew the circuit board of BITX-20 (equal to:
Photos/G0BAK/G0BAK BITX PCB.jpg) of the .zip file of the project but
I am having some difficults with the position of components, in
Please, help me, I drew the circuit board of BITX-20 (equal to:
Photos/G0BAK/G0BAK BITX PCB.jpg) of the .zip file of the project but
I am having some difficults with the position of components, in
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By
felipetanaweb
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More PCB Layouts 3 messages
Hi Folks,
It looks like the list has gone quiet.
I've just uploaded to the FILES directory two more module PCB's.
The RF Mixer and the Xtal Filter. I have also included a scale in GIF
format to enab
Hi Folks,
It looks like the list has gone quiet.
I've just uploaded to the FILES directory two more module PCB's.
The RF Mixer and the Xtal Filter. I have also included a scale in GIF
format to enab
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By
Mike W
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Experimenters Chassis available.
Today I was looking for brass shimming in my local metals recycle
centre but instead I found a perfect source of Aluminium chassis
for a blob-job with a control panel ( aka Manhatten et. al. ).
T
Today I was looking for brass shimming in my local metals recycle
centre but instead I found a perfect source of Aluminium chassis
for a blob-job with a control panel ( aka Manhatten et. al. ).
T
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By
Mike W
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Current Drain 2 messages
G'day Troops,
They say that 'Idle Hands are the Devil's Playground', and as it was a
bit too chilly to mess about on my workbench in the garage I sat
perusing the circuit of the BITX20 in my warm lit
G'day Troops,
They say that 'Idle Hands are the Devil's Playground', and as it was a
bit too chilly to mess about on my workbench in the garage I sat
perusing the circuit of the BITX20 in my warm lit
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By
Sam Caldwell
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The Toroid Chronicles 4 messages
Ok BITX20'ers, receiving the email below from Heinz OE5EEP last night,
reminded me that I have some toroid-frying news. Regardless of the
invalidity of microwaving toroids to determine RF suitability,
Ok BITX20'ers, receiving the email below from Heinz OE5EEP last night,
reminded me that I have some toroid-frying news. Regardless of the
invalidity of microwaving toroids to determine RF suitability,
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By
Hans Summers
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DC Return for VFO Mixer diodes... 10 messages
Chris - PA3CRX
Excellent Mod for the BITX20. I just did it and it works just like you said it would.
Thanks,
Arv - K7HKL
-------------------------
Proposed Modification BITX20
To improve
Chris - PA3CRX
Excellent Mod for the BITX20. I just did it and it works just like you said it would.
Thanks,
Arv - K7HKL
-------------------------
Proposed Modification BITX20
To improve
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By
Arv Evans
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Position BFO in relation to IF filter curve. 2 messages
Hi all,
I had printed a posting but now I can not find the original one
back...
The posting says that if the curve of the x-tal filter is measured an
known, the position of the BFO frequency should
Hi all,
I had printed a posting but now I can not find the original one
back...
The posting says that if the curve of the x-tal filter is measured an
known, the position of the BFO frequency should
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By Chris van den Berg
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