Date   

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
 

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


BitX17 IF Frequency

Greg Derda
 

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: BITX20A board finished (report JL1KRA)

ah6gi
 

--- 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: BITX20A board finished (report JL1KRA)

R. R. Robson
 

Great, Junichi! Hope to see your pix soon. I still have not begun mine, still fighting issues and problems in my softrocks and my firefly.
73 de Robby WB5RVZ


Re: Latching Relays -- suggestions on make/model

eplerkeppler
 

When I say latching, I mean it in the context of "A latching relay has
two relaxed states (bistable)." ( http://en.wikipedia.org/wiki/Relay )

The idea would be to apply voltage one way throught coil to get
switched to one state. Then voltage need not be sustained to stay in
that state.

Then to switch the voltage applied in the other direction through the
coil and the switch stays in this new state with again the voltage
removed.

This way you just bump it once with current to switch to either state
without sustaining current to a coil.

My case is switching double throw ON-ON' states.

I have a circuit that I would prefer to not have the battery power
sustained to the relay coil, hence my interest.

Most relays I see are Normally Open but what I'm interested in is
bi-stable On or On'

I have not figured out how I will use it in the bitx20 just yet, to be
honest it's for another project.

Thanks for your input Arv. I suspect the Wikipedia entry might be
more clear as to whether all latching relays are bistable or if they
are just a specific type of latching.

-- Chas

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

Charles WC5MC

Almost any relay can be a latching relay if you use a set of it's own
"make" contacts to source the coil supply voltage.

How are you planning on using latching relays in your BITX20?

Arv K7HKL
_._

eplerkeppler wrote:

I thought I'd ask if anyone has a pet make/model latching relay they
use and where to buy it.

My application will be a 9.6 volt battery for powering the switching
coil, so anything 9.6 Volts or less for the switching power is fine.
I can always put in a regulator to get down to 5 V or 3 or whatever.

The loads with be a few signal level loads then perhaps maybe one for
as much as a 200 mA load at most.

I would like it to be smallish and maybe 15 dollars or less but let me
know what you know about / like.

-- Charles McMurrough WC5MC

*I'm going to cross post this to a few other groups so my appologies
if we are like minded and share more than one group.

--
======================================
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]


BITX20A board finished (report JL1KRA)

qrpjl1kra
 

Hi all,

Received my BITX20A last October, I started work in January.
Spending several weekend spare time, finally I completed
the board yesterday.

When I saw the kit first, it was formidable one including
many toroids to be wound and many discrete parts. But
I was encouraged by messages in this list and helped
by additional works as follows.

An original assembly manual in qrpkits.com is well written
step by step instruction. In this manual, mount of parts
are separated into small section and minimize human error.

N7VE's Enhanced build note is another good instruction to be
printed. This note includes nice close up pictures.
Seeing two manuals, I understand what should be done
next correctly.

Adjustment is clearly seen in videos now. PA adjust video and
basic alignment video (KC0WOX) are my first experience
learning how to adjust rig from forerunners. Image training
with the video avoid blow IRF-510 MOSFETs by over current.

As for BITX20A kit itself, though there are a few hundred
parts, it is amazingly perfect since there was no missing parts
and no extra parts. Doug's qrpkits.com is doing excellent work.

Overall, started from Ashhar's design, the bitx20 is the most
educational QRP-SSB kit for me.
I really thank this community providing such good kit and
supported works.

When I completely finished alignment and enclosure works
I will post my BITX20A picture.


JL1KRA/AA3ZT
Junichi Nakajima


Re: Latching Relays -- suggestions on make/model

Arv Evans
 

Charles WC5MC

Almost any relay can be a latching relay if you use a set of it's own
"make" contacts to source the coil supply voltage.

How are you planning on using latching relays in your BITX20?

Arv K7HKL
_._

eplerkeppler wrote:


I thought I'd ask if anyone has a pet make/model latching relay they
use and where to buy it.

My application will be a 9.6 volt battery for powering the switching
coil, so anything 9.6 Volts or less for the switching power is fine.
I can always put in a regulator to get down to 5 V or 3 or whatever.

The loads with be a few signal level loads then perhaps maybe one for
as much as a 200 mA load at most.

I would like it to be smallish and maybe 15 dollars or less but let me
know what you know about / like.

-- Charles McMurrough WC5MC

*I'm going to cross post this to a few other groups so my appologies
if we are like minded and share more than one group.

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


Latching Relays -- suggestions on make/model

eplerkeppler
 

I thought I'd ask if anyone has a pet make/model latching relay they
use and where to buy it.

My application will be a 9.6 volt battery for powering the switching
coil, so anything 9.6 Volts or less for the switching power is fine.
I can always put in a regulator to get down to 5 V or 3 or whatever.

The loads with be a few signal level loads then perhaps maybe one for
as much as a 200 mA load at most.

I would like it to be smallish and maybe 15 dollars or less but let me
know what you know about / like.


-- Charles McMurrough WC5MC

*I'm going to cross post this to a few other groups so my appologies
if we are like minded and share more than one group.


Re: Current consumption

Leonard <bitx@...>
 

After you've soldered a while, take a break, pop the top on a cool one,
sit back and watch this:

http://golddredgervideo.com/kc0wox/basicalignment.wmv

It details a basic alignment and about 45 seconds from the beginning,
you'll see the very first test, check the receiver current. In my case,
it was 122 ma.

There's a whole lot more video on the kit, both assembly and alignment
at http://golddredgervideo.com/kc0wox/bitx20avideos.htm

Leonard
www.kc0wox.com


Re: Current consumption

Greg Derda
 

Mine is about 120ma.

Greg
ki4mmm

On Feb 12, 2008, at 1:04 PM, w9ran wrote:

Hi,
New to the group, new Hendricks kit sitting here waiting for me to
assemble it.

Can someone tell me what the standby current consumption is in receive
mode? I've not been able to find this by searching previous posts, so
apolgize if it's been asked before. Thanks!

73, Bob W9RAN



Current consumption

w9ran
 

Hi,
New to the group, new Hendricks kit sitting here waiting for me to
assemble it.

Can someone tell me what the standby current consumption is in receive
mode? I've not been able to find this by searching previous posts, so
apolgize if it's been asked before. Thanks!

73, Bob W9RAN


Fan Filter

kwroberson
 

Hello All,My fan filter is a pie network 1000 MF ,1 mh choke
and another 1000 MF , My cap working voltages are 35 WV,16 WV wud be
fine. Keep parts close to fan,My fan is pulling the Hot air out
the back of case,Also my case is vented,this helps keep VFO cool.
73 LL Ken K5DNL