Date   
Hendricks Bitx20A Manual error

Bob Miller <dvcamvideo2004@...>
 

There is an error on page 24 of the latest manual, where it says to
install Q3 and Q4. It should read Q4 and Q5 unless I'm not
understanding something. Q3 is in the transmitter driver circuit and
gets installed on page 30.

Please let me know if I'm mistaken.

Thanks,

Bob
wb6kwt

Re: Hendricks Bitx20A Manual error

Management <charlie@...>
 

Bob Miller wrote:
There is an error on page 24 of the latest manual, where it says to
install Q3 and Q4. It should read Q4 and Q5 unless I'm not
understanding something. Q3 is in the transmitter driver circuit and
gets installed on page 30.

Please let me know if I'm mistaken.

Thanks,

Bob
wb6kwt


Bob,

You're not mistaken! It's on my list to mention. Also, I did not see
mention of R30, 10R which I decided to insert at the VFO stage.


Charlie.

--
M0WYM
www.radiowymsey.org

BITX20A first contact

montyshu1
 

Not sure of the alignment, I went on the air from central Florida with
my BITX20A.

First contact: Brazil! Getting ready for a weekend contest. He said I
was off-frequency - will check that out.

Not bad!!

Monty, K2DLJ

Re: BITX20A first contact

Management <charlie@...>
 

montyshu1 wrote:
Not sure of the alignment, I went on the air from central Florida with
my BITX20A.

First contact: Brazil! Getting ready for a weekend contest. He said I
was off-frequency - will check that out.

Not bad!!

Monty, K2DLJ

<SNIP>

Congratulation! How far was that? Antenna?


Charlie.


--
M0WYM
www.radiowymsey.org

Re: Hendricks Bitx20A Manual error

Bob Miller <dvcamvideo2004@...>
 

Thanks Charlie, I missed that one (R30).

Bob
wb6kwt

Management <charlie@...> wrote: Bob Miller wrote:
> There is an error on page 24 of the latest manual, where it says to
> install Q3 and Q4. It should read Q4 and Q5 unless I'm not
> understanding something. Q3 is in the transmitter driver circuit and
> gets installed on page 30.
>
> Please let me know if I'm mistaken.
>
> Thanks,
>
> Bob
> wb6kwt
>
>
>
Bob,

You're not mistaken! It's on my list to mention. Also, I did not see
mention of R30, 10R which I decided to insert at the VFO stage.

Charlie.

--
M0WYM
www.radiowymsey.org




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New file uploaded to BITX20

BITX20@...
 

Hello,

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File : /Hendricks QRP Kits BITX20A/BITX20A_Block_Diagram(K7HKL).jpeg
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Description : Block Diagram for BITX20A Kit

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Re: Hendricks Bitx20A Manual error

Arv Evans
 

For all those who have found errors in earlier BITX20A documentation, I
am in the final phase of final update for the BITX20A Assembly Manual.
If you know of any additional errors please let me know before tomorrow
morning...or it may be too late to record the fix. Earlier comments on
errors that have been posted have been incorporated in what I am writing
now. Thank all of you for the assistance and keen eyes in spotting
typo's, errors, etc. I could not have done it without all of you.

Arv
_._


Bob Miller wrote:


Thanks Charlie, I missed that one (R30).

Bob
wb6kwt

Management <charlie@...
<mailto:charlie%40peartreegreen.org>> wrote: Bob Miller wrote:
There is an error on page 24 of the latest manual, where it says to
install Q3 and Q4. It should read Q4 and Q5 unless I'm not
understanding something. Q3 is in the transmitter driver circuit and
gets installed on page 30.

Please let me know if I'm mistaken.

Thanks,

Bob
wb6kwt


Bob,

You're not mistaken! It's on my list to mention. Also, I did not see
mention of R30, 10R which I decided to insert at the VFO stage.

Charlie.

--
M0WYM
www.radiowymsey.org




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Re: Copper wire & annealing.

 

Hihi , Good one Raj :-) ...what did you think would happen when you
put a lighter flame to it :-D ..ahh , thats funny.
Hi Hi Greg, that was supposed to be funny! :-) IMHO all these home
softening processes don't work.. including boiling! I would like to see
any research done of this "boiling process". Nothing on the net on the
subject.

OTOH, I have some excellent wire that does not burn in contact with
a flame, it chars when the wire turns red hot. I have seen enameled
wire where the enamel comes away easily on soldering, dream to
work with, probably not good for transformers.

Alternatively Q Dope , clear nail polish , clear candle wax ,
superglue , paint laquer , some epoxies , etc, all do their part to
dampen the coil in a physical way.
Best way!

Cheers & 73

--
Raj, vu2zap
Bengaluru, South India.

Re: Copper wire & annealing.

Ashhar Farhan <farhan@...>
 

i think the word 'annealing' is a bit of a misnomer. the idea is to thermally expand and contract the wiring a few times to relieve any mechanical stresses in the coil. after an extreme swing of tempuratures, the winding will be more settled.
this techniques owes itself to w7EL. I first read about it in his article on the 'Optimized transceiver' pulished in 1992 or so.
but all said and done, it is part of the lore. it needs a rigorous proof.
- farhan

On Sat, 27 Oct 2007, Raj wrote:


Hihi , Good one Raj :-) ...what did you think would happen when you
put a lighter flame to it :-D ..ahh , thats funny.
Hi Hi Greg, that was supposed to be funny! :-) IMHO all these home
softening processes don't work.. including boiling! I would like to see
any research done of this "boiling process". Nothing on the net on the
subject.

OTOH, I have some excellent wire that does not burn in contact with
a flame, it chars when the wire turns red hot. I have seen enameled
wire where the enamel comes away easily on soldering, dream to
work with, probably not good for transformers.

Alternatively Q Dope , clear nail polish , clear candle wax ,
superglue , paint laquer , some epoxies , etc, all do their part to
dampen the coil in a physical way.
Best way!

Cheers & 73

--
Raj, vu2zap
Bengaluru, South India.


Re: Copper wire & annealing.

Greg W:-) <onegammyleg@...>
 

Your right , true annealing would require the wire to be heated to a
dull to cherry red color , and then cooled.
Obviously boiling in water doesn't achieve anywhere near that sort of
temperature.
Some say boiling works , but I prefer nail polish or wax.

gregW:-) OH2FFY

==================================================================

--- In BITX20@..., Ashhar Farhan <farhan@...> wrote:

i think the word 'annealing' is a bit of a misnomer.
SNIP

kit status...

unmanagedtn <unmanaged@...>
 

I am a 27 yo ham in the south eastern part of the USA and I am
wondering about the status of the kits...

I am intrested in building this kit for use.


73 de KE5TVV

Re: Copper wire & annealing.

sg2112 <SG2112@...>
 

I don't see this mentioned very often in toroid winding articles but I
do something that I've heard called annealing but it's really not (I
was always told true annealing requires heat)

Basically you take your length of wire, clamp one end in a small vise,
wrap the other end a couple of turn around a screwdriver shaft and
give it a gentle steady pull and you'll feel the wire stretch (Careful
don't over do it) Then when you wind the coil you get a much tighter
wind and the wire stays in place better ... in the case of
bifilar/trifilar windings I stretch each wire before I twist them up
with a hand drill

The only time I actually anneal a coil is for VFO tanks and then what
I do is get a pot of water boiling, remove it from the heat and drop
the wound coil in for a few minutes and it does make a difference in
stability and drift .... I don't remember exactly where I picked that
technique up but I think it was from Doug Demaw's writings

JR

BTW I didn't know you were in this group Greg, the SSB rig I'm
building is a little more complex than the BitX (and multiband) but
this is a great place to get ideas and a fresh perspective



--- In BITX20@..., "Greg W:-)" <onegammyleg@...> wrote:

Hihi , Good one Raj :-) ...what did you think would happen when you
put a lighter flame to it :-D ..ahh , thats funny.

When they make copper wire it is drawn , or pulled thin.
During this process the wire is worked , and becomes hard , so they
anneal it many times during the drawing process to keep it soft.
Too hard and it will snap while drawing , too soft and it will
probably have irregular thickness.

The end result should be a nice copper wire that bends easily.

As you wind a coil you will work harden it , this will turn the soft
wire into something like a spring.

A spring will ring with resonance (like a tuning fork rings from a
mechanical action) and this is what leads to microphonics.

Microphonics will cause a change in frequency based on a external
physical vibration applied to a coil. ..egg , banging the radios
cabinet causes a change in frequency.
Microphonics is not drift, as known in the normal sense.

Heating the coil it hot water after winding will soften the copper a
little taking away its ringability (Ime making up words here)., and
this will reduce mircrophoncs.

Alternatively Q Dope , clear nail polish , clear candle wax ,
superglue , paint laquer , some epoxies , etc, all do their part to
dampen the coil in a physical way.

Some of these things may alter the coils Q , so beware of that ,
wheras heating the coil in hot water probably would give the best
result.

gregW:-) OH2FFY

==================================================================

Re: Copper wire & annealing.

w keith griffith
 

Is your project a one off, or is it documented somewhere on the web?

At 06:52 AM 10/27/2007, you wrote:
I don't see this mentioned very often in toroid winding articles but I
do something that I've heard called annealing but it's really not (I
was always told true annealing requires heat)

Basically you take your length of wire, clamp one end in a small vise,
wrap the other end a couple of turn around a screwdriver shaft and
give it a gentle steady pull and you'll feel the wire stretch (Careful
don't over do it) Then when you wind the coil you get a much tighter
wind and the wire stays in place better ... in the case of
bifilar/trifilar windings I stretch each wire before I twist them up
with a hand drill

The only time I actually anneal a coil is for VFO tanks and then what
I do is get a pot of water boiling, remove it from the heat and drop
the wound coil in for a few minutes and it does make a difference in
stability and drift .... I don't remember exactly where I picked that
technique up but I think it was from Doug Demaw's writings

JR

BTW I didn't know you were in this group Greg, the SSB rig I'm
building is a little more complex than the BitX (and multiband) but
this is a great place to get ideas and a fresh perspective



--- In BITX20@..., "Greg W:-)" <onegammyleg@...> wrote:

Hihi , Good one Raj :-) ...what did you think would happen when you
put a lighter flame to it :-D ..ahh , thats funny.

When they make copper wire it is drawn , or pulled thin.
During this process the wire is worked , and becomes hard , so they
anneal it many times during the drawing process to keep it soft.
Too hard and it will snap while drawing , too soft and it will
probably have irregular thickness.

The end result should be a nice copper wire that bends easily.

As you wind a coil you will work harden it , this will turn the soft
wire into something like a spring.

A spring will ring with resonance (like a tuning fork rings from a
mechanical action) and this is what leads to microphonics.

Microphonics will cause a change in frequency based on a external
physical vibration applied to a coil. ..egg , banging the radios
cabinet causes a change in frequency.
Microphonics is not drift, as known in the normal sense.

Heating the coil it hot water after winding will soften the copper a
little taking away its ringability (Ime making up words here)., and
this will reduce mircrophoncs.

Alternatively Q Dope , clear nail polish , clear candle wax ,
superglue , paint laquer , some epoxies , etc, all do their part to
dampen the coil in a physical way.

Some of these things may alter the coils Q , so beware of that ,
wheras heating the coil in hot water probably would give the best
result.

gregW:-) OH2FFY

==================================================================



Yahoo! Groups Links



'Grif' N7IVS

Re: kit status...

Arv Evans
 

unmanagedtn

Go to <http://www.qrpkits.com> and click on the BITX20A listing.
Doug has the kits available for purchase at this time.

Arv
_._


unmanagedtn wrote:


I am a 27 yo ham in the south eastern part of the USA and I am
wondering about the status of the kits...

I am intrested in building this kit for use.

73 de KE5TVV

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 : /Hendricks QRP Kits BITX20A/BITX20A_Block_Diagram(K7HKL).gif
Uploaded by : k7hkl_arv <arvid.evans@...>
Description : Block Diagram (.gif image) for BITX20A Kit

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/Hendricks%20QRP%20Kits%20BITX20A/BITX20A_Block_Diagram%28K7HKL%29.gif

To learn more about file sharing for your group, please visit:
http://help.yahoo.com/help/us/groups/files

Regards,

k7hkl_arv <arvid.evans@...>

Re: New file uploaded to BITX20

Jim Tonne <tonne@...>
 

Subject: [BITX20] New file uploaded to BITX20
That is a very nicely-drawn block! What program was
used to draw it?

- Jim WB6BLD

Re: New file uploaded to BITX20

Arv Evans
 

Jim

I use "Dia" for most of my schematic and quick drawing type things.
<http://sourceforge.net/projects/dia-installer/> is the windows
installer for this.
It is included as part of the Ubuntu Linux installation. That drawing
was done with the Linux version.

For serious CAD work (i.e. commercial projects) I usually work with
sagcad or eaglecad.

Arv
_._


Jim Tonne wrote:



Subject: [BITX20] New file uploaded to BITX20
That is a very nicely-drawn block! What program was
used to draw it?

- Jim WB6BLD

Re: Progress on the kit

Frank Waarsenburg <waarsenburg@...>
 

Hi all,

I was planning to fix the coils as shown in the instruction video;
with melt glue and a heat gun. But reading this, I'm not sure the
ferrite will survive the heat gun. Does anyone have some experience
with the bitx coils and a heatgun?

Frank PA3CNO

Boiling it in water will only raise the core temp to 100C.
Hot melt glue melts at ~120 - ~190C. (wiki)

But a heat gun blows at up to 500C.

Using hot-melt glue on a core probably doesn't do anything bad , but
perhaps the heat gun is a another story altogether.

Re: Progress on the kit

Allison Parent <kb1gmx@...>
 

--- In BITX20@..., "Frank Waarsenburg" <waarsenburg@...>
wrote:

Hi all,

I was planning to fix the coils as shown in the instruction video;
with melt glue and a heat gun. But reading this, I'm not sure the
ferrite will survive the heat gun. Does anyone have some experience
with the bitx coils and a heatgun?
How hot do you plan to get them? Ferrite will be fine to around
250-350F. Heating them to glowing is not advised. ;)

Allison

Frank PA3CNO

Boiling it in water will only raise the core temp to 100C.
Hot melt glue melts at ~120 - ~190C. (wiki)

But a heat gun blows at up to 500C.

Using hot-melt glue on a core probably doesn't do anything bad , but
perhaps the heat gun is a another story altogether.

Bitx20A

Bob Miller <dvcamvideo2004@...>
 

Where can I find info on alignment of the Hendricks Bitx20A? I don't
see it in the manual or in the files section.

Thanks,

Bob