Date   

fqn1n50c availability in UK

cendoubleu <cendoubleu@...>
 

Has anyone managed to find a source for fqn1n50c in UK or know of a
suitable substitute. Regards all


Re: Minimalist Huff&Puff

Ron <pa2rf@...>
 

OK Arv,
I have used the formula a couple of times and think its quite
reliable.

Happy homebrewing and best regards form The Netherlands,
Ron
PA2RF

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

Ron

What I obtained from your web page is the formula for step size.
That was then converted to a Linux shellscript program.
But, of course we will blame Hans if it doesn't work! ;-)

Arv
_._


Ron wrote:

Dear bitx'ers,
Saw some messages referring to this circuit.
Just want to let you know that the design of the minimalist
circuit on
my webpage http://home.hetnet.nl/~brink120/huf2.htm
<http://home.hetnet.nl/%7Ebrink120/huf2.htm>
is in fact the design of Hans Summers. I just copied the device
and put
it on vero-board ! All the credits go to Hans.

73
Ron
pa2rf

--
======================================
Web: http://K7HKL.homelinux.net
http://bitx20a.livejournal.com
http://home.earthlink.net/~arvevans/
http://www.geocities.com/k7hkl_arv/
======================================




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


A Digital counter for the BITX20A

Allan Copland <acopland@...>
 

Hi Folks,

The BITX20A is a nice kit but some people might want to have a digital
frequency counter. Fortunately there is a simple, and cheap solution.

I ordered a Digital Frequency Counter from a Greek seller on Ebay who
programmed in the required frequency offset to display the correct
working frequency.

Jim's shop is at http://myworld.ebay.co.uk/jpl995/

The counters are competitively priced and require 40mv of drive so
I'd recommend adding a simple buffer stage between VFO and counter
so as not to load the VFO.

Although I haven't yet integrated my counter into the BITX20A, I have
tested it with my Philips RF signal generator and it works fine, as
expected.

The BITX20A has an 11Mhz IF. If you specify this, Jim will program in
the correct offset. His counters use BLUE LCD panels (16*2) with
back-lighting. The back-lighting is fed via a wire that runs from a
small PCB to the display, so it's easily disabled (or made
switchable). With no RF input, the counter reads 11.00000Mhz as
expected. The VFO frequency (3-3.35mhz)is added to this when
operating to display 14-14.35. The counter runs from 5V and has it's
own on-board regulator so it can run from a 13.8V supply.

Delivery from Athens was commendably swift.

73 Al.
GM1SXX


Re: Minimalist Huff&Puff

Arv Evans <arvid.evans@...>
 

Ron

What I obtained from your web page is the formula for step size.
That was then converted to a Linux shellscript program.
But, of course we will blame Hans if it doesn't work! ;-)

Arv
_._


Ron wrote:


Dear bitx'ers,
Saw some messages referring to this circuit.
Just want to let you know that the design of the minimalist circuit on
my webpage http://home.hetnet.nl/~brink120/huf2.htm
<http://home.hetnet.nl/%7Ebrink120/huf2.htm>
is in fact the design of Hans Summers. I just copied the device and put
it on vero-board ! All the credits go to Hans.

73
Ron
pa2rf

--
======================================
Web: http://K7HKL.homelinux.net
http://bitx20a.livejournal.com
http://home.earthlink.net/~arvevans/
http://www.geocities.com/k7hkl_arv/
======================================


Re: Capacitor question

Jim Kortge <jokortge@...>
 

Leonard wrote:
Is there any reason I couldn't use a poly cap like the ones used in the vfo in a lowpass filter?
No, there aren't any reasons not to use one of those Leonard. They are rated for 50 volts, and probably can take a tad more without blowing up. They are very low loss, ideal for filter use without eating up precious power. Silver Mica caps are even lower loss, but get a bit pricey.
I'm assembling a version 3 PA board from Sunil and I need a 560pf cap for the lowpass filter and all I have are poly caps at that value.
Do it!

72,

Jim, K8IQY


Re: Capacitor question

Ronald A. Stunden <ve7yc@...>
 

Leonard, Have snt you a couple of email but all bounce. Thanks for the envelope.. Cheers Ron


Re: Capacitor question

Leonard <bitx@...>
 

I made my first contact today with a second bitx kit. The one that is
in http://golddredgervideo.com/kc0wox/bitx3/finalassembly.htm I'll
add
a page showing the final product durning the week.
What I forgot to add was it was with W8YP in Tornado, West Virginia.
About 1350 miles from Denver.

Leonard


Capacitor question

Leonard <bitx@...>
 

Is there any reason I couldn't use a poly cap like the ones used in the
vfo in a lowpass filter?

I'm assembling a version 3 PA board from Sunil and I need a 560pf cap
for the lowpass filter and all I have are poly caps at that value.

http://golddredgervideo.com/kc0wox/bitxver3/bitxver3pacomponent.gif

The component layout is a work in progress. I need some higher current
diodes and I'll probably use 35 volt electrolytics.

I made my first contact today with a second bitx kit. The one that is
in http://golddredgervideo.com/kc0wox/bitx3/finalassembly.htm I'll add
a page showing the final product durning the week.

Leonard


Filter Shape Picture ( Re:BITX20A board finished (report JL1KRA)

qrpjl1kra
 

Hi, Robby and AH6GI

Thanks your comments,
My chasis preparation need more time. So, here is some bench
pictutes in progress.

http://ph.groups.yahoo.com/group/BITX20/photos/browse/a24d

In this weekend I am doing filter alignment.
Since I couldn't adjust TX carrier point correctly
with my 2 tone generator, I used Frequency Responce Mesurement System
(FRMS) and checked the BTX20A filter.
The FRMS is popular homebrew tool among JA QRPer using DDS and AD8307.
Without spectrum analyzer this is a good tool to see filer shape.

As you see the first pic, the bandpass has 10dB ripple.
DF5SF fileter pics shows similar shape. I suppose the
BTX20As are showing same character.

DF5SF changed C54,55,56 to 150,200,150pF from original 82,100,82pF.
I am now reaching 68,0,68pF to minimize the ripple. But
the skirt of the filter is worser than before to supress carrier.

May be this problem had been discussed in this list.
I am just arrived the point. I will check the previous messages
tomorrow.

Junihi Nakajima JL1KRA

--- In BITX20@..., "ah6gi" <ah6gi@...> wrote:

--- In BITX20@..., "R R Robson" <rrrobson@> wrote:

Great, Junichi! Hope to see your pix soon.
Yes, please take pictures!

I too have to finish other work, an SB-303 with a bad LMO. This is an
easy fix but it takes time to get the LMO out, replaced, and then
align the drive mechanism.

de ah6gi/4


Re: Hendrick Bitx-20_ Norcal Digi VFO

kwroberson
 

Mark, Hello , I used hookup wire instead of the connector that they
used because mine needed to be side by side.If u still need a photo
let me know and I will take the shield off and shot from back side.
Yesterday I worked ZS4 and ON4 on JT65A running 4 Watts and HB
rotatable dipole @ 42 ft , I work EU almost every day.
73 Hpe c u on the bands Ken K5DNL

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

Hi Ken

Any chance of an image showing the mounting and interconnection between
FCC1 and FCC2?

Thanks.

Mark.

G0MGX

kwroberson wrote:

Hello all, I uploaded another image , inside view, 73 Ken K5DNL





Minimalist Huff&Puff

Ron <pa2rf@...>
 

Dear bitx'ers,
Saw some messages referring to this circuit.
Just want to let you know that the design of the minimalist circuit on
my webpage http://home.hetnet.nl/~brink120/huf2.htm
is in fact the design of Hans Summers. I just copied the device and put
it on vero-board ! All the credits go to Hans.

73
Ron
pa2rf


Re: Hendrick Bitx-20_ Norcal Digi VFO

Mark Jones <Mark@...>
 

Hi Ken

Any chance of an image showing the mounting and interconnection between
FCC1 and FCC2?

Thanks.

Mark.

G0MGX

kwroberson wrote:


Hello all, I uploaded another image , inside view, 73 Ken K5DNL


Re: BitX17 IF Frequency

Ashhar Farhan <farhan@...>
 

it is best to use as high an IF as is possible. At higher frequencies, the
pass-band appears to be narrower, hence the phase delay is better and the
skirt is better. I would imagine that the PC's standard 14.318 MHz crystals
are ideal. going higher in IF would compromise your Image rejection (for
instance, with 16MHz IF, the 18 MHz will have an image at 14 Mhz).

- farhan

On Feb 16, 2008 1:14 AM, Greg Derda <gderda@...> wrote:

Thanks to all who have replied so far!

Arv,

Thank you, this is what just I needed to help visualize the whole
process! Now i can stare at the schematics and figure out what is
going on. I actually have a "spare" stabilizer from my build of a WN5Y
ELR kit (long story - I ended up with two stabilizers). Picture is
here...

http://jezebel.ucns.uga.edu/~derda/elr/P6200001.JPG<http://jezebel.ucns.uga.edu/%7Ederda/elr/P6200001.JPG>

I thought about using it (once I figured out "how") with my BitX20a,
but I am very happy with the stability of that radio. Of course, I am
telling myself that I might build my third Bitx (I ordered the version
3 boards from Sunil) for PSK31, so I might want to use it there ;-).

Anyway, thanks again, I think I have enough information to keep my
noodle turning for a while.....

Greg
ki4mmm

On Feb 15, 2008, at 2:16 PM, Arv Evans wrote:

Greg

My latest BITX20A H&P stabilizer taps the VFO output at the junction
of
R-27 and Q-6 collector (top of R-27 on the kit circuit board). I fed
the common point between H&P integrator caps to a 150K resistor that
connects to the junction of R-38 and D-9.

At present I am using the G8SEQ idea

<http://downloads.hanssummers.com/sprat122b.pdf>

of an intact watch unit providing 32 Hz reference with half a 74HC74
as
the latch. The other half of the 74HC74 is used as a buffer to square
up
the VFO output.

The Ron Brink PA2RF circuit is probably a more elegant solution, but
this simpler method seems to work well enough for my needs.

Arv
_._

Greg Derda wrote:

Martien,

Thank you for the reply and info. I have considered a stabilizer,
and
I have tried to learn more about them, but what is not clear to me
is
where to tap the VFO for the output to, and input from, the
stabilizer.
For example, if a person wanted to add one to the Farhan-circuit
VFO,
where would you tap it?

Greg
ki4mmm

On Feb 15, 2008, at 10:25 AM, Martien wrote:

--- In BITX20@... <BITX20%40yahoogroups.com> <mailto:
BITX20%40yahoogroups.com>,
Greg Derda <gderda@...> wrote:
Hello Greg,

You could use the 10MHz standard with an 8Mhz VFO. This VFO can be
easily stabilised using a "Huff and Puff" circuit. There are many
examples on the web. I used this simple one (fig.1 schematic)):
http://home.hetnet.nl/~brink120/huf2.htm<http://home.hetnet.nl/%7Ebrink120/huf2.htm>
<http://home.hetnet.nl/%7Ebrink120/huf2.htm>
VFO is rock solid, PSK 31 is no problem.

Text is in Dutch but the schematics are quite clear.

Martien PE1BWI




--
======================================
Web: http://K7HKL.homelinux.net
http://bitx20a.livejournal.com
http://home.earthlink.net/~arvevans/<http://home.earthlink.net/%7Earvevans/>
http://www.geocities.com/k7hkl_arv/
======================================








Re: BitX17 IF Frequency

Greg Derda
 

Thanks to all who have replied so far!

Arv,

Thank you, this is what just I needed to help visualize the whole
process! Now i can stare at the schematics and figure out what is
going on. I actually have a "spare" stabilizer from my build of a WN5Y
ELR kit (long story - I ended up with two stabilizers). Picture is
here...

http://jezebel.ucns.uga.edu/~derda/elr/P6200001.JPG

I thought about using it (once I figured out "how") with my BitX20a,
but I am very happy with the stability of that radio. Of course, I am
telling myself that I might build my third Bitx (I ordered the version
3 boards from Sunil) for PSK31, so I might want to use it there ;-).

Anyway, thanks again, I think I have enough information to keep my
noodle turning for a while.....

Greg
ki4mmm

On Feb 15, 2008, at 2:16 PM, Arv Evans wrote:

Greg

My latest BITX20A H&P stabilizer taps the VFO output at the junction
of
R-27 and Q-6 collector (top of R-27 on the kit circuit board). I fed
the common point between H&P integrator caps to a 150K resistor that
connects to the junction of R-38 and D-9.

At present I am using the G8SEQ idea

<http://downloads.hanssummers.com/sprat122b.pdf>

of an intact watch unit providing 32 Hz reference with half a 74HC74
as
the latch. The other half of the 74HC74 is used as a buffer to square
up
the VFO output.

The Ron Brink PA2RF circuit is probably a more elegant solution, but
this simpler method seems to work well enough for my needs.

Arv
_._

Greg Derda wrote:
>
> Martien,
>
> Thank you for the reply and info. I have considered a stabilizer,
and
> I have tried to learn more about them, but what is not clear to me
is
> where to tap the VFO for the output to, and input from, the
stabilizer.
> For example, if a person wanted to add one to the Farhan-circuit
VFO,
> where would you tap it?
>
> Greg
> ki4mmm
>
> On Feb 15, 2008, at 10:25 AM, Martien wrote:
>
> > --- In BITX20@... <mailto:BITX20%40yahoogroups.com>,
> Greg Derda <gderda@...> wrote:
> > Hello Greg,
> >
> > You could use the 10MHz standard with an 8Mhz VFO. This VFO can be
> > easily stabilised using a "Huff and Puff" circuit. There are many
> > examples on the web. I used this simple one (fig.1 schematic)):
> > http://home.hetnet.nl/~brink120/huf2.htm
> <http://home.hetnet.nl/%7Ebrink120/huf2.htm>
> > VFO is rock solid, PSK 31 is no problem.
> >
> > Text is in Dutch but the schematics are quite clear.
> >
> > Martien PE1BWI
> >
> >
> >
>
>
>
>

--
======================================
Web: http://K7HKL.homelinux.net
http://bitx20a.livejournal.com
http://home.earthlink.net/~arvevans/
http://www.geocities.com/k7hkl_arv/
======================================





Re: BitX17 IF Frequency

Jim Kortge <jokortge@...>
 

n7ve wrote:
I would think a 13 MHz IF would reasonably work well with a 5 MHz VFO.
There are 13 MHz crystals available in the 13 MHz range.
Mouser has 12.96 MHz crystals in stock, 520-HCU1296-18X. This would
place the 3rd harmonic of the VFO at 15 MHz, and the 4th at 20 MHz, to
move it as far as possible from 18 MHz. Running the VFO at 5 MHz is
not too bad.
- Dan, N7VE
Another combination that might work well is a 22.11 MHz Super VXO (with two matched crystals) and the IF at 4 MHz. The VXO should eliminate the need for that H&P circuitry. There are probably other combinations that would also work well.

72,

Jim, K8IQY


Re: BitX17 IF Frequency

Arv Evans <arvid.evans@...>
 

Greg

My latest BITX20A H&P stabilizer taps the VFO output at the junction of
R-27 and Q-6 collector (top of R-27 on the kit circuit board). I fed
the common point between H&P integrator caps to a 150K resistor that
connects to the junction of R-38 and D-9.

At present I am using the G8SEQ idea

<http://downloads.hanssummers.com/sprat122b.pdf>

of an intact watch unit providing 32 Hz reference with half a 74HC74 as
the latch. The other half of the 74HC74 is used as a buffer to square up
the VFO output.

The Ron Brink PA2RF circuit is probably a more elegant solution, but
this simpler method seems to work well enough for my needs.

Arv
_._


Greg Derda wrote:


Martien,

Thank you for the reply and info. I have considered a stabilizer, and
I have tried to learn more about them, but what is not clear to me is
where to tap the VFO for the output to, and input from, the stabilizer.
For example, if a person wanted to add one to the Farhan-circuit VFO,
where would you tap it?

Greg
ki4mmm

On Feb 15, 2008, at 10:25 AM, Martien wrote:

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>,
Greg Derda <gderda@...> wrote:
Hello Greg,

You could use the 10MHz standard with an 8Mhz VFO. This VFO can be
easily stabilised using a "Huff and Puff" circuit. There are many
examples on the web. I used this simple one (fig.1 schematic)):
http://home.hetnet.nl/~brink120/huf2.htm
<http://home.hetnet.nl/%7Ebrink120/huf2.htm>
VFO is rock solid, PSK 31 is no problem.

Text is in Dutch but the schematics are quite clear.

Martien PE1BWI




--
======================================
Web: http://K7HKL.homelinux.net
http://bitx20a.livejournal.com
http://home.earthlink.net/~arvevans/
http://www.geocities.com/k7hkl_arv/
======================================


Re: BitX17 IF Frequency

n7ve <dan.Tayloe@...>
 

I would think a 13 MHz IF would reasonably work well with a 5 MHz VFO.
There are 13 MHz crystals available in the 13 MHz range.

Mouser has 12.96 MHz crystals in stock, 520-HCU1296-18X. This would
place the 3rd harmonic of the VFO at 15 MHz, and the 4th at 20 MHz, to
move it as far as possible from 18 MHz. Running the VFO at 5 MHz is
not too bad.

- Dan, N7VE

--- In BITX20@..., "Ron [W5RCM / ZS1MCD]" <w5rcm@...> wrote:

10 MHz IFs in the US can be problematic with WWV broadcasting there.
--
72, Ron McDowell - W5RCM / ZS1MCD
Austin TX / Hermanus ZA
w5rcm [at] Ham-Stuff [dot] NET

Greg Derda wrote:
Now that I have completed my BitX20a, I have started another BitX
using
the Far Circuits boards, and I would like to build this one for 17
meters. I've found some very useful information in the messages,
files, and photos archives of this group, but so far, I have not seen
mention of the IF frequencies people have used for 17m. Although I
have a couple of potential DDS options available to me, I don't know
that I want to use such a "valuable resource" on the narrow
bandspread
of a 17m rig.

Options that come to mind for a traditional IF/LO combination are
(presuming a 18.1Mhz target):

IF LO
---- ----
10 8.1
12 6.1
16 2.1
14.76 3.34 (chosen as an oddball example using available oddball
crystals).

I don't see many HF VFO's in the 8Mhz range, so I am guessing it
is not
common. I have crystals for the latter two options easily
available to
me and am leaning toward one of them.

I guess that instead of babbling on with guesses, I'd like to just
ask......

Does anybody have suggestions for a good IF/LO combination?

Thanks,
Greg
ki4mmm


Re: BitX17 IF Frequency

Greg Derda
 

Martien,

Thank you for the reply and info. I have considered a stabilizer, and
I have tried to learn more about them, but what is not clear to me is
where to tap the VFO for the output to, and input from, the stabilizer.
For example, if a person wanted to add one to the Farhan-circuit VFO,
where would you tap it?

Greg
ki4mmm

On Feb 15, 2008, at 10:25 AM, Martien wrote:

--- In BITX20@..., Greg Derda <gderda@...> wrote:
Hello Greg,

You could use the 10MHz standard with an 8Mhz VFO. This VFO can be
easily stabilised using a "Huff and Puff" circuit. There are many
examples on the web. I used this simple one (fig.1 schematic)):
http://home.hetnet.nl/~brink120/huf2.htm
VFO is rock solid, PSK 31 is no problem.

Text is in Dutch but the schematics are quite clear.

Martien PE1BWI



Re: BitX17 IF Frequency

Ron [W5RCM / ZS1MCD] <w5rcm@...>
 

10 MHz IFs in the US can be problematic with WWV broadcasting there.
--
72, Ron McDowell - W5RCM / ZS1MCD
Austin TX / Hermanus ZA
w5rcm [at] Ham-Stuff [dot] NET

Greg Derda wrote:

Now that I have completed my BitX20a, I have started another BitX using the Far Circuits boards, and I would like to build this one for 17 meters. I've found some very useful information in the messages, files, and photos archives of this group, but so far, I have not seen mention of the IF frequencies people have used for 17m. Although I have a couple of potential DDS options available to me, I don't know that I want to use such a "valuable resource" on the narrow bandspread of a 17m rig.

Options that come to mind for a traditional IF/LO combination are (presuming a 18.1Mhz target):

IF LO
---- ----
10 8.1
12 6.1
16 2.1
14.76 3.34 (chosen as an oddball example using available oddball crystals).

I don't see many HF VFO's in the 8Mhz range, so I am guessing it is not common. I have crystals for the latter two options easily available to me and am leaning toward one of them.

I guess that instead of babbling on with guesses, I'd like to just ask......

Does anybody have suggestions for a good IF/LO combination?

Thanks,
Greg
ki4mmm


Re: BitX17 IF Frequency

Martien <sproet01@...>
 

--- In BITX20@..., Greg Derda <gderda@...> wrote:
Hello Greg,

You could use the 10MHz standard with an 8Mhz VFO. This VFO can be
easily stabilised using a "Huff and Puff" circuit. There are many
examples on the web. I used this simple one (fig.1 schematic)):
http://home.hetnet.nl/~brink120/huf2.htm
VFO is rock solid, PSK 31 is no problem.

Text is in Dutch but the schematics are quite clear.

Martien PE1BWI