Date   
Re: Crystal Filter Video

pe2bs@tiscali.nl <pe2bs@...>
 

Hi Leonard,

I enjoyed your movie. Very instructive. Thanks.

73

Ruud

PE2BS

Re: Crystal Filter Video

pswarman <pswarman@...>
 

I like the videos Len, I'm learning tricks/techniques from each of them
(matching crystals, use of spectrum analyser, those schottky diodes). I
particularly like it when you show something going wrong and the steps
to find a cure..... this is realistic and for my money the fun part
of building. Many thanks Len.
Paul, G0odp, nr Poole, Dorset, England

--- In BITX20@..., "kc0wox" <bitx@...> wrote:

Demonstrates crystal selection, sweeping the filter using a sweep
generator and oscilloscope, and checking and adjusting the carrier
suppression using a spectrum analyzer - 21 minutes long, 68mb in size

This may answer some of the BFO Frequency questions as it
demonstrates
visually the effect of the BFO frequency, the mdulation frequency,
and
the filter bandpass on sidebands and the carrier.

http://golddredgervideo.com/bitx20/filter.wmv

Leonard
KC0WOX

Re: Crystal Filter Video

Jim Larsen - AL7FS <jimlarsen2002@...>
 

Leonard, if you chose to make three dozen tech videos like these I would just love them. Thank you.

73, Jim
Jim Larsen
Anchorage, Alaska
http://www.AL7FS.us/

--- In BITX20@..., "kc0wox" <bitx@...> wrote:
Demonstrates crystal selection, sweeping the filter using a sweep generator and oscilloscope, and checking and adjusting the carrier suppression using a spectrum analyzer - 21 minutes long, 68mb in size
This may answer some of the BFO Frequency questions as it demonstrates visually the effect of the BFO frequency, the mdulation frequency, and the filter bandpass on sidebands and the carrier.

http://golddredgervideo.com/bitx20/filter.wmv

Leonard
KC0WOX
Yahoo! Groups Links

Your harmonic....

Rob Frohne <frohro@...>
 

Hi Leonard,

Is that second harmonic possibly present in the audio you are feeding to
the balanced modulator? Perhaps your signal generator has harmonic
distortion, or perhaps your audio amplifier before the balanced
modulator has harmonic distortion.

73,

Rob, KL7NA
--
Rob Frohne, Ph.D., P.E.
E.F. Cross School of Engineering
Walla Walla College
100 SW 4th Street
College Place, WA 99324
(509) 529-3585
http://www.wwc.edu/~frohro/

Re: Crystal Filter Video

Brian VA3DXV
 

I've been lurking here but I just thought I should say thank you. I
love videos like this and I look forward to more of them if at all
possible.

Thank you very much!

--- In BITX20@..., "kc0wox" <bitx@...> wrote:

Demonstrates crystal selection, sweeping the filter using a sweep
generator and oscilloscope, and checking and adjusting the carrier
suppression using a spectrum analyzer - 21 minutes long, 68mb in size

This may answer some of the BFO Frequency questions as it demonstrates
visually the effect of the BFO frequency, the mdulation frequency, and
the filter bandpass on sidebands and the carrier.

http://golddredgervideo.com/bitx20/filter.wmv

Leonard
KC0WOX

Re: Crystal Filter Video

Mike W <mike@...>
 

What a brilliant video Leonard, good pictures and excellent audio description.
Thankyou.
For those who may have difficulty with playing it, I had Media Player version
WMP-6 and it would'nt play so I had to upgrade to WMP-9 on my win98se box and
Then it played a dream. Another hint, if you have a slow network connection,
go to leonards website and right click on the link to download and save a copy
of the file to your machine, then there will be far less interuption to the
flow.
Ths has to be one of the best ham HowTo videos I have seen, thanks..
Mike G8NXD qthr
--

On 19 Feb 2007 at 15:07, kc0wox wrote:

Demonstrates crystal selection, sweeping the filter using a sweep
generator and oscilloscope, and checking and adjusting the carrier
suppression using a spectrum analyzer - 21 minutes long, 68mb in size

This may answer some of the BFO Frequency questions as it demonstrates
visually the effect of the BFO frequency, the mdulation frequency, and
the filter bandpass on sidebands and the carrier.

http://golddredgervideo.com/bitx20/filter.wmv

Leonard
KC0WOX

Crystal Filter Video

kc0wox <bitx@...>
 

Demonstrates crystal selection, sweeping the filter using a sweep
generator and oscilloscope, and checking and adjusting the carrier
suppression using a spectrum analyzer - 21 minutes long, 68mb in size

This may answer some of the BFO Frequency questions as it demonstrates
visually the effect of the BFO frequency, the mdulation frequency, and
the filter bandpass on sidebands and the carrier.

http://golddredgervideo.com/bitx20/filter.wmv

Leonard
KC0WOX

Re: First things first (long post)

ted <ted.kell@...>
 

Thank you.

Ted

On Mon, 2007-02-19 at 05:29 +0000, Rahul Srivastava wrote:
Hi!
Check the link for modified schematics:
http://f1.grp.yahoofs.com/v1/0C7ZRc4A5yi74P3UIAa3LNVoqQw2DBN6s5QWLcyFdw42_rFO3p2IeNIaU00pZqYnDHmrbyanvaW9WaXZOh4-hMT0OyLN/BITX%2020%20V1%2C2%263%20/bitxv3.GIF
73
Rahul VU3WJM

ted <ted.kell@...> wrote:
Is the Version schematic posted someplace?

Ted
N3Ted

On Fri, 2007-02-09 at 19:03 +0000, Rahul Srivastava wrote:
Hi!
Most of my friends here in VU and myself use the ver3 single sided PCB layout with BC547 as generic devices. Q1 frontend is usualy 2SC2570A a common low noise device but there are other substitutes as well.
The artwork was done by me in pieces ie tracks were laid out in EasyPc from Number one Sytem in DOS and copper pour done on their latest windows Demo version. Coils are 10.7Mhz FM IF 10mm cans.
Relevant files are uploaded under files section of group inclusive of track layout, component overlay and solder mask ( Check folder marked Ver 1,2,3). A GIF of origianl BITX ckt as modified is also present with kind consent of Farhan.
http://groups.yahoo.com/group/BITX20/files/BITX%2020%20V1%2C2%263%20/

Anything else just drop a line.
73
Rahul VU3WJM



kc0wox <bitx@...> wrote:
Which design of the board are you using. Where did you get the artwork?
Leonard
KC0WOX
Hi Rahul,
I intend to build your BITX 20 transceiver and have just etched and
drilled a set of PCB's for the project. I was wondering do you have a
component overlay for these boards? I think I can figure out the PA
board, but, the main I may need some assistants.

Thanks for the great work your have done on this Design.

Regards Ron,
VK2YQJ.





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Re: First things first (long post)

Rahul Srivastava
 

Hi!
Check the link for modified schematics:
http://f1.grp.yahoofs.com/v1/0C7ZRc4A5yi74P3UIAa3LNVoqQw2DBN6s5QWLcyFdw42_rFO3p2IeNIaU00pZqYnDHmrbyanvaW9WaXZOh4-hMT0OyLN/BITX%2020%20V1%2C2%263%20/bitxv3.GIF
73
Rahul VU3WJM

ted <ted.kell@...> wrote:
Is the Version schematic posted someplace?

Ted
N3Ted

On Fri, 2007-02-09 at 19:03 +0000, Rahul Srivastava wrote:
Hi!
Most of my friends here in VU and myself use the ver3 single sided PCB layout with BC547 as generic devices. Q1 frontend is usualy 2SC2570A a common low noise device but there are other substitutes as well.
The artwork was done by me in pieces ie tracks were laid out in EasyPc from Number one Sytem in DOS and copper pour done on their latest windows Demo version. Coils are 10.7Mhz FM IF 10mm cans.
Relevant files are uploaded under files section of group inclusive of track layout, component overlay and solder mask ( Check folder marked Ver 1,2,3). A GIF of origianl BITX ckt as modified is also present with kind consent of Farhan.
http://groups.yahoo.com/group/BITX20/files/BITX%2020%20V1%2C2%263%20/

Anything else just drop a line.
73
Rahul VU3WJM



kc0wox <bitx@...> wrote:
Which design of the board are you using. Where did you get the artwork?
Leonard
KC0WOX
Hi Rahul,
I intend to build your BITX 20 transceiver and have just etched and
drilled a set of PCB's for the project. I was wondering do you have a
component overlay for these boards? I think I can figure out the PA
board, but, the main I may need some assistants.

Thanks for the great work your have done on this Design.

Regards Ron,
VK2YQJ.





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Re: First things first (long post)

ted <ted.kell@...>
 

Is the Version schematic posted someplace?

Ted
N3Ted

On Fri, 2007-02-09 at 19:03 +0000, Rahul Srivastava wrote:
Hi!
Most of my friends here in VU and myself use the ver3 single sided PCB layout with BC547 as generic devices. Q1 frontend is usualy 2SC2570A a common low noise device but there are other substitutes as well.
The artwork was done by me in pieces ie tracks were laid out in EasyPc from Number one Sytem in DOS and copper pour done on their latest windows Demo version. Coils are 10.7Mhz FM IF 10mm cans.
Relevant files are uploaded under files section of group inclusive of track layout, component overlay and solder mask ( Check folder marked Ver 1,2,3). A GIF of origianl BITX ckt as modified is also present with kind consent of Farhan.
http://groups.yahoo.com/group/BITX20/files/BITX%2020%20V1%2C2%263%20/

Anything else just drop a line.
73
Rahul VU3WJM



kc0wox <bitx@...> wrote:
Which design of the board are you using. Where did you get the artwork?
Leonard
KC0WOX
Hi Rahul,
I intend to build your BITX 20 transceiver and have just etched and
drilled a set of PCB's for the project. I was wondering do you have a
component overlay for these boards? I think I can figure out the PA
board, but, the main I may need some assistants.

Thanks for the great work your have done on this Design.

Regards Ron,
VK2YQJ.





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Re: PA board questions

Dan Reynolds
 

BTW, I'm not complaining... I'm just grateful for understanding what I
do!! :-)
I just need a little help every now and then.
LOL!!
Dan KB9JLO

--- In BITX20@..., "Dan Reynolds" <on30ng@...> wrote:

I have the PA board made from the images ...

PA board questions

Dan Reynolds
 

I have the PA board made from the images in the file section and the
actual over lay image as well. I've been able to match up most of the
parts pretty well and off board connections - but I'm confused as to
what is in the upper right corner of the board - according to the overlay.

It looks like it might be a power supply circuit - four diodes, filter
capacitors, etc.

It also looks like on the overlay that the IRF510 is connected to the
+12 V line all the time instead of being connected through the +T
(transmit) line. Which is correct?

Does anyone have an overlay or a marked up overlay with all the
connections marked up?

I'm moving right along...
Thanks.

Dan KB9JLO

Re: BITX20 Kit Progress Report

Rahul Srivastava
 

TNX Arv,
I think I missed on this one. Will try out on weekend and play around a bit with BITX.
73
Rahul



arv evans <arvid.evans@...> wrote:
Rahul

On my earlier BITX40, I traced the T/R changeover "ping" to the 50 mfd
power bypass filter (220 ohm to 50 mfd and mic amp) on the microphone
amplifier. When I moved the 220 ohm and it's 50 mfd so that the relay
disconnected that 50 mfd from the mic amp on going back to receive, the
problem became much less (almost trivial). Seems the 50 mfd was
powering the microphone amplifier for a short time after the transceiver
was switched from transmit to receive mode. This allows a speaker to
feedback into the microphone with to be expected results (cheap fix is
to use headphones only).

The new Hendricks PCB layout has the same problem (actually worse
because the cap is now 100 mfd), so we will need to address this in the
next version.

Arv
_._

Rahul Srivastava wrote:

Hi! Dan,
As evident from my earlier mail I feared the stability problem with
the 3904 devices as they were already a good performer ie gain
provider in comparison to cheap sub standard 547s and PN2222s. I am
glad Dan has worked a way out.
While you all are on the job I would request to look into some muting
system as well cause the loud changeover thump is too annoying.
All best & 73
Rahul VU3WJM

Doug Hendricks <ki6ds@... <mailto:ki6ds%40dospalos.org>> wrote:
It is time to give you another progress report. We have good news and
we have bad news. The bad news first.

We are going to have to do another run of prototypes with a few
changes in the layout. We discovered that there was a stability
problem with the i.f. amplifier in the receiver that required a fix.
Dan found one, and it is fixed but the fix needs to be added to the
layout. The first layout had some pins reversed on the relays, again
that had to be corrected. And finally, there is a stability problem
with the final amplifier chain the way that it is layed out. Dan is
going to add one more stage to add additional gain and also move the
location of the final amplifier away from the source of the instability.

The good news. First of all, we have not found anything that is
remotely close to a show stopper. The VFO is going to be stable and we
are happy with it. We have found that we can use toroids and trimcaps
where needed. We also are happy with most of the pcboard layout, other
than the fixes mentioned above.

The bottom line. The BITX20 will happen, don't worry. One thing that
Dan, Arv and I are agreed on is that we must do adequate testing to
make sure that when we do release the kits, that they will work. Every
run of prototypes cost money, but it is money that is well spent and
necessary. Every run of prototypes also cost time, and as the old
adage goes, time is money. But again, the time is well spent and
necessary.

Now I hope that you will understand why I have not accepted any orders
or money. I don't want to do that until we have a viable product and a
delivery date that can be realisticly met. Thanks again for all of
your support and patience. This is going to be a great experience when
we get to the end. 72, Doug, Dan, Arv and Jim.




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Re: BITX20 Kit Progress Report

Arv Evans
 

Rahul

On my earlier BITX40, I traced the T/R changeover "ping" to the 50 mfd
power bypass filter (220 ohm to 50 mfd and mic amp) on the microphone
amplifier. When I moved the 220 ohm and it's 50 mfd so that the relay
disconnected that 50 mfd from the mic amp on going back to receive, the
problem became much less (almost trivial). Seems the 50 mfd was
powering the microphone amplifier for a short time after the transceiver
was switched from transmit to receive mode. This allows a speaker to
feedback into the microphone with to be expected results (cheap fix is
to use headphones only).

The new Hendricks PCB layout has the same problem (actually worse
because the cap is now 100 mfd), so we will need to address this in the
next version.

Arv
_._


Rahul Srivastava wrote:


Hi! Dan,
As evident from my earlier mail I feared the stability problem with
the 3904 devices as they were already a good performer ie gain
provider in comparison to cheap sub standard 547s and PN2222s. I am
glad Dan has worked a way out.
While you all are on the job I would request to look into some muting
system as well cause the loud changeover thump is too annoying.
All best & 73
Rahul VU3WJM

Doug Hendricks <ki6ds@... <mailto:ki6ds%40dospalos.org>> wrote:
It is time to give you another progress report. We have good news and
we have bad news. The bad news first.

We are going to have to do another run of prototypes with a few
changes in the layout. We discovered that there was a stability
problem with the i.f. amplifier in the receiver that required a fix.
Dan found one, and it is fixed but the fix needs to be added to the
layout. The first layout had some pins reversed on the relays, again
that had to be corrected. And finally, there is a stability problem
with the final amplifier chain the way that it is layed out. Dan is
going to add one more stage to add additional gain and also move the
location of the final amplifier away from the source of the instability.

The good news. First of all, we have not found anything that is
remotely close to a show stopper. The VFO is going to be stable and we
are happy with it. We have found that we can use toroids and trimcaps
where needed. We also are happy with most of the pcboard layout, other
than the fixes mentioned above.

The bottom line. The BITX20 will happen, don't worry. One thing that
Dan, Arv and I are agreed on is that we must do adequate testing to
make sure that when we do release the kits, that they will work. Every
run of prototypes cost money, but it is money that is well spent and
necessary. Every run of prototypes also cost time, and as the old
adage goes, time is money. But again, the time is well spent and
necessary.

Now I hope that you will understand why I have not accepted any orders
or money. I don't want to do that until we have a viable product and a
delivery date that can be realisticly met. Thanks again for all of
your support and patience. This is going to be a great experience when
we get to the end. 72, Doug, Dan, Arv and Jim.




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Re: Filter frequency and BFO setting

Rahul Srivastava
 

Hi! Jim,
I very happy to hear your SSB project is going on well. Even though I did not get a Benton Harbour punch here in VU but in one of bylanes I saw one machine shop having a jig punching holes in metal strips about 4inches wide in different sizes two of them I felt are just right for manhattan style for double and multiple component connections. Shopkeeper has agreed to run couple of square feet of plain copper clad for peanuts.
VXO would indeed be a simpler route and once you get onto a project I have observed, one manages to source a Xtal near abt the required frequency one way or the other.
It was tough for me to convince certain oldies abt the preamp in comparison to their MOSFET preamp figures. Well the IC7800 frontend schematic came handy thre Hi! Hi!.
Eagerly awaiting an update on your page.
Greetings & 73
Rahul VU3WJM

Jim Kortge <jokortge@...> wrote:


Rahul Srivastava wrote:
Hi! Jim,
Nice to hear from you. Looking forward to some designs from you. BTW Norton rf preamps amps patterned on your designs are huge success with friends here.
73
Rahul VU3WJM
Greetings Rahul,

Nice to hear from you.

Great to hear the Norton design ala K8IQY is being used. That design is really
solid and works well. Been following the activity on the BITX20; lots of
enthusiastic builders and many experimenters it appears. All good!! :-)

I'm actually working on a two-band SSB/CW rig targeted for bicycle mobile and
pedestrian mobile use, so Rx is really low power, somethink like 38 ma. at the
moment without the DDS VFO. I may scrap that in favor of a more conventional VFO
or VXO to keep the current down. The unfortunate thing is that most of the ICs
that I've used are only available in SMT. That keeps the parts count down and
the features up, but makes it much harder for most hams to build. I may revert
to a configuration where only the ICs are SMT, and everything else is
through-hole, to make building it more reasonable. We'll see.

I did notice that some of the BITX20 builders were talking about putting the rig
on 40 meters. I've thought about that and realized it would be very easy to do
if the IF were shifted to 10.7 MHz. Fortunately, there is a standard computer
crystal close to that frequency from Mouser and others. I'm going to get some on
order to flesh out a replacement crystal filter for the rig. With the slightly
higher crystal filter, the VFO would move down in frequency a bit; then the same
VFO could be used for either a 20 or 40 meter rig, with only parts in the
front-end needing to be changed.

Guess that's it my friend. Keep up the good work and I'll continue to read the
emails and help where I can. I've offered to assist Doug, KI6DS with his kit, so
will be building a BITX20 somewhere along the way. I'm interested in how it
looks on the lab equipment. I've modelled much of the circuitry in SPICE and
will continue to do more of that.

72 and kind regards,

Jim, K8IQY





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Re: BITX20 Kit Progress Report

Rahul Srivastava
 

Hi! Dan,
As evident from my earlier mail I feared the stability problem with the 3904 devices as they were already a good performer ie gain provider in comparison to cheap sub standard 547s and PN2222s. I am glad Dan has worked a way out.
While you all are on the job I would request to look into some muting system as well cause the loud changeover thump is too annoying.
All best & 73
Rahul VU3WJM

Doug Hendricks <ki6ds@...> wrote:
It is time to give you another progress report. We have good news and we have bad news. The bad news first.

We are going to have to do another run of prototypes with a few changes in the layout. We discovered that there was a stability problem with the i.f. amplifier in the receiver that required a fix. Dan found one, and it is fixed but the fix needs to be added to the layout. The first layout had some pins reversed on the relays, again that had to be corrected. And finally, there is a stability problem with the final amplifier chain the way that it is layed out. Dan is going to add one more stage to add additional gain and also move the location of the final amplifier away from the source of the instability.

The good news. First of all, we have not found anything that is remotely close to a show stopper. The VFO is going to be stable and we are happy with it. We have found that we can use toroids and trimcaps where needed. We also are happy with most of the pcboard layout, other than the fixes mentioned above.

The bottom line. The BITX20 will happen, don't worry. One thing that Dan, Arv and I are agreed on is that we must do adequate testing to make sure that when we do release the kits, that they will work. Every run of prototypes cost money, but it is money that is well spent and necessary. Every run of prototypes also cost time, and as the old adage goes, time is money. But again, the time is well spent and necessary.

Now I hope that you will understand why I have not accepted any orders or money. I don't want to do that until we have a viable product and a delivery date that can be realisticly met. Thanks again for all of your support and patience. This is going to be a great experience when we get to the end. 72, Doug, Dan, Arv and Jim.








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Home Made new

Alessandro Santucci <i0skk@...>
 

Hallo guys,

this message is in order to inform you that at this time we are publishing
an "Home Made Newsletter" Called HMN (Home Made News), and we have a
newsgroup too, at address http://it.groups.yahoo.com/group/HomeMadeNews/ .

The aim is to inform and show news about homebrew, websites, products, and
so on about this theme.
The sheet is mainly in Italian Language, but there are also few parts in
English as technique materials in the world are in English so we are trying
to make a semi-double-language newsletter for Italian Hams too!

If you like to receive, freely of course, the newsletter, please let me
know, and I'll send next issues by email. If you like to see past issue, we
have a server where we'll put all we want to share with other homebrewers,
and NL too, at address http://www.eco-lavoro.com/hmn/ that is splitted in
several sections (in the Bulletin there are the two past issue of NL).

Hope this is useful for you, have my best 73


Alex - I0SKK

Alessandro Santucci

I QRP C #305

INORC # 536

ARI Telegraphy Club
Honorary Member #62

email: i0skk@...

Web: www.eco-lavoro.com/i0skk

--
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.5.441 / Virus Database: 268.17.39/685 - Release Date: 13/02/2007
22.01

New video's

kc0wox <bitx@...>
 

I added two new Bitx videos to my website at
http://golddredgervideo.com/bitx20/

One is a 12 1/2 minute tutorial on amplitude and double sideband
modulation. It's 40.5 mb in size.

http://golddredgervideo.com/bitx20/amplitudeanddoublesideband.wmv

The second one is a troubleshooting tutorial on the mike amp section.
It's 7 1/2 minutes and 24.4 mb in size.

http://golddredgervideo.com/bitx20/mikeamptest.wmv

It illustrates how easy it is to plug a part in the wrong place.

Leonard
KC0WOX

Re: BITX20 Kit Progress Report

pswarman <pswarman@...>
 

Thanks for the update Doug and for yours and the team's efforts in
getting this far. I hope your mail server has no bandwidth issues as
I suspect when you do fire the starting pistol there will be a deluge
of orders!

Watch out.

Sincere thanks, Paul, G0odp in sunny Poole, Dorset, England

--- In BITX20@..., "Doug Hendricks" <ki6ds@...> wrote:

It is time to give you another progress report. We have good news
and we have bad news. The bad news first.

We are going to have to do another run of prototypes with a few
changes in the layout. We discovered that there was a stability
problem with the i.f. amplifier in the receiver that required a fix.
Dan found one, and it is fixed but the fix needs to be added to the
layout. The first layout had some pins reversed on the relays, again
that had to be corrected. And finally, there is a stability problem
with the final amplifier chain the way that it is layed out. Dan is
going to add one more stage to add additional gain and also move the
location of the final amplifier away from the source of the
instability.

The good news. First of all, we have not found anything that is
remotely close to a show stopper. The VFO is going to be stable and
we are happy with it. We have found that we can use toroids and
trimcaps where needed. We also are happy with most of the pcboard
layout, other than the fixes mentioned above.

The bottom line. The BITX20 will happen, don't worry. One thing
that Dan, Arv and I are agreed on is that we must do adequate
testing to make sure that when we do release the kits, that they will
work. Every run of prototypes cost money, but it is money that is
well spent and necessary. Every run of prototypes also cost time,
and as the old adage goes, time is money. But again, the time is
well spent and necessary.

Now I hope that you will understand why I have not accepted any
orders or money. I don't want to do that until we have a viable
product and a delivery date that can be realisticly met. Thanks
again for all of your support and patience. This is going to be a
great experience when we get to the end. 72, Doug, Dan, Arv and Jim.

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

Toroid supplier

Chris Day <c_day@...>
 

Here is a very good and reliable Toroid company to deal with.

http://www.kitsandparts.com/index.asp

My small order in New Zealand within 10 days of placing it.

73s and keep up the great BITX work.

Chris
ZL1CVD