Date   
Re: Components

William Ford <ford1@...>
 

Component parcel received today.many thanks Jack

----- Original Message -----
Sent: Thursday, June 24, 2004 4:57 PM
Subject: [BITX20] Components


Hello

Just to let you know that all the components arrived this morning, from
three different suppliers. The LM386 was from Farnell because I wasn't sure
that the Rapid Electronics version was the correct LM386N-1 version. All
components have been counted out and shipped, UK orders by first class post
(should arrive tomorrow morning) and international orders via airmail.

When I'd finished there were 14 BC547 transistors left over. This could be
because they are so cheap that counting them precisely costs Rapid more than
giving a few extra. Or it could be that I messed up my own counting, as the
whole process was rather tedious and I have been having a very stressful
day. If anyone is missing any then let me know, or needs some extra spares.

I owe quite a few of you emails and also have a couple of other things to
say, but am too busy to do it today so pls QRX

72/3 de Hans G0UPL
http://www.HansSummers.com

Re: Components

Hans Summers <Hans.Summers@...>
 

 
No problems Jack, thanks for the cheque which was received this morning. My very best wishes to your wife, and good luck with the project when you have time. Nearly 60 years of marriage is wonderful. I am 33, married for 8 years so some catching up to do! We have a 15 month old daughter who takes most of my time.
 
73 de Hans G0UPL

-----Original Message-----
From: William Ford [mailto:ford1@...]
Sent: 25 June 2004 10:19
To: BITX20@...
Subject: Re: [BITX20] Components

Component parcel received today.many thanks Jack
----- Original Message -----
Sent: Thursday, June 24, 2004 4:57 PM
Subject: [BITX20] Components


Hello

Just to let you know that all the components arrived this morning, from
three different suppliers. The LM386 was from Farnell because I wasn't sure
that the Rapid Electronics version was the correct LM386N-1 version. All
components have been counted out and shipped, UK orders by first class post
(should arrive tomorrow morning) and international orders via airmail.

When I'd finished there were 14 BC547 transistors left over. This could be
because they are so cheap that counting them precisely costs Rapid more than
giving a few extra. Or it could be that I messed up my own counting, as the
whole process was rather tedious and I have been having a very stressful
day. If anyone is missing any then let me know, or needs some extra spares.

I owe quite a few of you emails and also have a couple of other things to
say, but am too busy to do it today so pls QRX

72/3 de Hans G0UPL
http://www.HansSummers.com


Re: The PC as a lab instrument

Hans Summers <Hans.Summers@...>
 

does anybody have more stories about using PCs in the
home lab?
Farhan, I don't have a PC at home at all, except an old laptop my XYL uses
for internet access. I prefer to do everything without a PC. I even built my
crazy 30m QRSS beacon project with no PC or microcontroller, see
http://www.hanssummers.com/radio/qrss/index.htm and
http://www.hanssummers.com/radio/qrss/qrv/index.htm . I sit in front of a
computer here in the office every day and somehow prefer that when I am at
home I don't have to be attached to one.

There's also the problem of the "homebrew only" law which rules my station.
So far the only exception to it is my old 5MHz oscilloscope and my DVM. Some
day I will get my Z80 computers up and running, and will be able to write
some homebrew software for QRSS and PSK31 etc.

73 Hans G0UPL
http://www.HansSummers.com

BFO Finished

Mark <Mark@...>
 

I've completed the VFO today, uploaded a couple of pictures to the
reflector. Not too sure about L3 - used a fixed choke instead of
winding. Any thoughts? Seems to be working OK.

Re: Components

Mark <Mark@...>
 

Mine arrived today too, many thanks Hans.

--- In BITX20@..., Hans Summers <Hans.Summers@t...>
wrote:

No problems Jack, thanks for the cheque which was received this
morning. My
very best wishes to your wife, and good luck with the project when
you have
time. Nearly 60 years of marriage is wonderful. I am 33, married
for 8 years
so some catching up to do! We have a 15 month old daughter who
takes most of
my time.

73 de Hans G0UPL

-----Original Message-----
From: William Ford [mailto:ford1@e...]
Sent: 25 June 2004 10:19
To: BITX20@...
Subject: Re: [BITX20] Components


Component parcel received today.many thanks Jack

----- Original Message -----
From: Hans <mailto:Hans.Summers@t...> Summers
To: 'BITX20@...' <mailto:'BITX20@...'>
Sent: Thursday, June 24, 2004 4:57 PM
Subject: [BITX20] Components


Hello

Just to let you know that all the components arrived this morning,
from
three different suppliers. The LM386 was from Farnell because I
wasn't sure
that the Rapid Electronics version was the correct LM386N-1
version. All
components have been counted out and shipped, UK orders by first
class post
(should arrive tomorrow morning) and international orders via
airmail.

When I'd finished there were 14 BC547 transistors left over. This
could be
because they are so cheap that counting them precisely costs Rapid
more than
giving a few extra. Or it could be that I messed up my own
counting, as the
whole process was rather tedious and I have been having a very
stressful
day. If anyone is missing any then let me know, or needs some
extra spares.

I owe quite a few of you emails and also have a couple of other
things to
say, but am too busy to do it today so pls QRX

72/3 de Hans G0UPL
http://www.HansSummers.com <http://www.HansSummers.com>



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Re: The PC as a lab instrument

Jim Strohm <jstrohm@...>
 

On Jun 25, 2004, at 8:34 AM, Hans Summers wrote:

There's also the problem of the "homebrew only" law which rules my station.
We should not look askance at ALL "store-bought" technology. Sometimes, recycled gear is nearly as satisfying as homebrewed, especially if it's recycled from the dust bin.

A few months back, I was challenged to write a book describing how to build a transmitter and receiver starting from ZERO technology. So far, I've outlined sections on how to knap flint, how to make fire with sticks, and how to develop the most rudimentary tools for metallurgy.

It appears that the shortest route to homebrewing a radio station essentially from dirt is to use gold for the wiring ... so far, I've found much more gold in the dust bin than lying about on the ground.

Jim N6OTQ

Re: Components

Hans Summers <Hans.Summers@...>
 

Mine arrived today too, many thanks Hans.
No problem Mark.

Sorry list members, Jack's earlier message on this subject and my reply got
copied to the whole list when in fact it was intended to be offlist.

Note that this list is configured such that the default reply address is the
list itself rather than the original message sender. This means that by
default replies go back to the list and if you want to reply only to the
sender you have to copy and paste their address in.

I prefer it this way, it generates more list traffic but I feel that often
what is of interest to the original sender will usually be of interest to
others, since we are in general all discussing the same rig. If there is any
significant feeling about this and you want it set the other way, that can
be done.

73 Hans G0UPL
http://www.HansSummers.com

Re: The PC as a lab instrument

Hans Summers <Hans.Summers@...>
 

There's also the problem of the "homebrew only" law which
rules my station.
We should not look askance at ALL "store-bought" technology.
Sometimes, recycled gear is nearly as satisfying as
homebrewed, especially if it's recycled from the dust
bin.
Don't get me wrong, I don't look askance at store-bought technology at all,
nor have anything against it or any other aspect of amateur radio. Some
people are committed QRP enthusiasts. I am mostly QRP but sometimes if condx
are bad and I want to get through to a friend I turn the 80m CW TX
http://www.hanssummers.com/radio/cwtx/index.htm up to its maximum 10W and I
don't feel bad about it.

There are so many aspects to amateur radio, each ham has his own areas of
interest. Some hate CW, others operate it exclusively. To each his own! But
my own passion is to homebrew everything.

For really extreme homebrew, I hope one day to build a valve transmitter and
matching receiver using components which are all constructed from household
items or things that can be purchased from the hardware store. Every
component: valves from baby food jars, capacitors from kitchen foil, etc
etc. See http://www.hanssummers.com/radio/homebrew/capacitor/index.htm for
the capacitor I built, the only part so far.

But that's just me - people who operate QRQ QRO black box contest stations
don't bother me either. Unless it's a time such as once happened when I was
in QSO with an SM6 on 80m, 2-way QRP CW and both about 339 or something
rather marginal, and midnight GMT comes around and suddenly the whole place
explodes with contest traffic and the SM6 and myself, well we both got
practically vapourised by the volume of the audio in our receivers. Had to
curse them a bit then ;-)

73 Hans G0UPL
http://www.HansSummers.com

Re: More components

Hans Summers <Hans.Summers@...>
 

Thanks for the offer Bruce. Let's keep it in mind and see how it goes. Over half the orders I had were from the UK, other than that US, Singapore and New Zealand. I don't know if that's because I announced the list on the GQRP mailing list and therefore more UK members joined, or if people were more inclined to buy locally to keep postage costs down. Though at £1.31 for postage for the packs to the US and worldwide, it wasn't too bad.
 
Is anyone a member of the US QRP-L list? I was but I couldn't handle the huge volume of email so I unsubscribed. Perhaps someone who's a member might like to announce the existence of this group, I'm sure the BITX20 would be of interest to many on that list too.
 
73 Hans G0UPL
 

-----Original Message-----
From: Bruce Raymond [mailto:bruceraymond@...]
Sent: 23 June 2004 20:13
To: BITX20@...
Subject: RE: [BITX20] More components

I realize that I'm late getting into the group.  Jameco (http://www.jameco.com/)
has 10 MHz, 50 ppm crystals for $0.69/10, $0.59/100+, $0.49/1000.  I think
that corresponds to 0,38 L/10, 0,32 L/100, and 0,27 L/1000 (I don't have a
symbol for British pounds on my keyboard).
 
Hans, you're going beyond the line of duty to take on the ordering task.  If
there's some assistance you need from the US side of the pond I'm willing to
help.
 
73,
Bruce Raymond/ND8I
 
 
-----Original Message-----
From: Hans Summers [mailto:Hans.Summers@...]
Sent: Wednesday, June 23, 2004 12:05 PM
To: 'BITX20@...'
Subject: [BITX20] More components


The two extra sets are already accounted for! Seems I should have bought
more spares, but I didn't really want to be stuck with components and be
unable to do anything with them.

I can get more sets, but without the savings from getting 10+, 25+ and 100+
prices on some items, the price would be £11.64 + postage (compared to £8.19
for this bulk-purchased set). Alternatively, tell me you're interested and
we'll wait say until next Wednesday same time (13:00 UK time) and see how
many orders arrive. Perhaps get some quantity discounts again, if there are
enough more people interested. What do people think?

And if anyone needs any particular component and can't source it locally
(e.g. IRF510 being sent to Baino in Singapore) then I can sort that out for
you too, just email me.

72/3 de Hans G0UPL

BITX20 & BITX40

arvevans@...
 

Hello to the BITX20 group (this is my first posting on this forum).

Farhan and myself have exchanged a couple of off-forum emails regarding mods to his excellent design. One interesting possibility is replacement of the LM-386 with a discrete component AF Amplifier. He said that he had not had the time to work up a schematic...so I have provided one (see attached .gif file). This can allow those without access to an LM-386 to build the unit.

Also, my layout for the BITX20 uses 10.7 MHZ IF transformers salvaged from dead AM/FM radios ( I dislike winding toroids! ). My construction is a BITX40 (40 Meters) and requires 55 pf across the 10.7 IFs to resonate on 7.2 MHZ. These 10.7 IF transformers might be made to resonate on 20M if the internal capacitors were removed ( break them with a screwdriver point ) and a small variable ( 5-25pf ) used to bring them to resonance.

73's
Arv - K7HKL

Fw: RE: The PC as a lab instrument

arvevans@...
 

I thought this forum was focused on the BITX20. Have I gotten into the wrong forum by accident?

Arv - K7HKL

-----Forwarded Message-----
From: Hans Summers <Hans.Summers@...>
Sent: Jun 25, 2004 7:34 AM
To: "'BITX20@...'" <BITX20@...>
Subject: RE: [BITX20] The PC as a lab instrument

<html><body>


<tt>
<BR>
does anybody have more stories about using PCs in the <BR>
home lab?<BR>
<BR>
Farhan, I don't have a PC at home at all, except an old laptop my XYL uses<BR>
for internet access. I prefer to do everything without a PC. I even built my<BR>
crazy 30m QRSS beacon project with no PC or microcontroller, see<BR>
<a href="http://www.hanssummers.com/radio/qrss/index.htm">http://www.hanssummers.com/radio/qrss/index.htm</a> and<BR>
<a href="http://www.hanssummers.com/radio/qrss/qrv/index.htm">http://www.hanssummers.com/radio/qrss/qrv/index.htm</a> . I sit in front of a<BR>
computer here in the office every day and somehow prefer that when I am at<BR>
home I don't have to be attached to one.<BR>
<BR>
There's also the problem of the "homebrew only" law which rules my station.<BR>
So far the only exception to it is my old 5MHz oscilloscope and my DVM. Some<BR>
day I will get my Z80 computers up and running, and will be able to write<BR>
some homebrew software for QRSS and PSK31 etc. <BR>
<BR>
73 Hans G0UPL<BR>
<a href="http://www.HansSummers.com">http://www.HansSummers.com</a><BR>
</tt>


<br>

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Re: The PC as a lab instrument

Hans Summers <Hans.Summers@...>
 

I thought this forum was focused on the BITX20.
Have I gotten into the wrong forum by accident?
Hey it wasn't *that* far off topic! Have a look back in the archives... It
stems from Farhan's questions about PC use which also relates to his telling
us previously about him using his computer for some audio and AGC
processing.

Several people have asked for possible AGC circuits for the BITX20. I'll see
what I can find over the weekend.

73 Hans G0UPL
http://www.hanssummers.com

BFO Clarification?

Mark <Mark@...>
 

All

I'm happy soldering here, but have a question:

In the text for the BITX20 it says "If you are using this for 14MHz
and above, the BFO will need a coil in series with the crystal".
This is what I have done - seems to work OK (see G0MGX folder in
pictures on reflector).

I just saw the alternative coil data that has been posted on the
reflector and that says "L3 was used in series between the crystal
and the 22pf trimmer cap plus I added 7pf Mica fixed cap across the
trimmer. Needed for USB"

I am therefore confused!

Can anyone shed any light on this?

Mark. G0MGX

Re: Components

Jon Harris <jon@...>
 

<AOL> Thanks Hans, all arrived safe and sound

Jon H.

----- Original Message -----
From: "William Ford" <ford1@...>
To: <BITX20@...>
Sent: Friday, June 25, 2004 10:18 AM
Subject: Re: [BITX20] Components


Component parcel received today.many thanks Jack
----- Original Message -----
From: Hans Summers
To: 'BITX20@...'
Sent: Thursday, June 24, 2004 4:57 PM
Subject: [BITX20] Components



Hello

Just to let you know that all the components arrived this
morning, from
three different suppliers. The LM386 was from Farnell because I
wasn't sure
that the Rapid Electronics version was the correct LM386N-1
version. All
components have been counted out and shipped, UK orders by
first class post
(should arrive tomorrow morning) and international orders via
airmail.

When I'd finished there were 14 BC547 transistors left over.
This could be
because they are so cheap that counting them precisely costs
Rapid more than
giving a few extra. Or it could be that I messed up my own
counting, as the
whole process was rather tedious and I have been having a very
stressful
day. If anyone is missing any then let me know, or needs some
extra spares.

I owe quite a few of you emails and also have a couple of other
things to
say, but am too busy to do it today so pls QRX

72/3 de Hans G0UPL
http://www.HansSummers.com

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Re: BFO Clarification?

Ashhar Farhan <farhan@...>
 

Mark,

USB requires setting the carrier to the lower edge of the filter's
passband and LSB requires setting the carrier to the upper edge.

given that we are sourcing crystals from varied places, it probable that
you will have to pull the crysal frequency down for USB and pull it up for
LSB.

adding a small series capacitance to the crystal pulls the frequency up
(good for LSB). to pull the frequency down you need inductive capacitance
in series with the crystal. it is often difficult to estimate just how
much (capactiance/inductance) will be required to position the bfo
correctly. in case of LSB, a 22pf trimmer in series with the crystal can
be tweaked to get the proper results.

in case of USB, i have found about 5uH to be ideal for the crystals that i
have used (3 builds so far). this may not work for you. so you can either
play with the number of turns on L3, or use the inductor with a
capactiance in series to vary the net reactance to set the frequency
properly.

- farhan

On Fri, 25 Jun 2004, Mark wrote:

All

I'm happy soldering here, but have a question:

In the text for the BITX20 it says "If you are using this for 14MHz
and above, the BFO will need a coil in series with the crystal".
This is what I have done - seems to work OK (see G0MGX folder in
pictures on reflector).

I just saw the alternative coil data that has been posted on the
reflector and that says "L3 was used in series between the crystal
and the 22pf trimmer cap plus I added 7pf Mica fixed cap across the
trimmer. Needed for USB"

I am therefore confused!

Can anyone shed any light on this?

Mark. G0MGX





Yahoo! Groups Links




Re: Atachments

Ashhar Farhan <farhan@...>
 

yahoo groups doesnt not retain attachments. if you can forward the
pictures to me, i canupload them on the folder.

i am new ot yahoo groups. i don't know if you can directly upload the
pictures without being a moderator.


- farhan

On Sat, 26 Jun 2004, Sam Caldwell wrote:

G'day Troops,

I note that one or two contributors have mentioned attachments (which
do not appear).
At the same time there are some photographs which CAN be accessed.

Being a Bear of Very Little Brain, I would appreciate it if some kind
person would explain - particularly as in the near future there will
no doubt be proud builders anxious to display their new-born
transceivers.

Regards, Sam C.





Yahoo! Groups Links




How to post schematics, images, etc.???

k7hkl_arv <arvevans@...>
 

Help please...
I'm new to this forum thing, so I have to ask "How does one go about
posting a schematic or picture of BITX related info"? I sent an
attached file with one of my posts and now my email post is there but
the attached .gif file is referenced as "Not Saved". )-8

Thanks,
Arv - K7HKL
_._

Atachments

Sam Caldwell <samc@...>
 

G'day Troops,

I note that one or two contributors have mentioned attachments (which
do not appear).
At the same time there are some photographs which CAN be accessed.

Being a Bear of Very Little Brain, I would appreciate it if some kind
person would explain - particularly as in the near future there will
no doubt be proud builders anxious to display their new-born
transceivers.

Regards, Sam C.

BITX20 component list

ik1zyw <pcravero@...>
 

Hi!
Has anyone attempted to list all BITX20 components? I haven't found
any link on Ashan's page. Here is my attempt at listing all
components, except for the IRF510 PA (had no time).

Please warn me off the list if corrections are needed.

73,
Paolo IK1ZYW


CAPACITORS
0.001u 2
0.1u 34
100p 3
10p 4
1u elec 2
2.2p 2
220p 3
22p var 6
365p var 1
47p 3
50u elec 6
560p 2
56p 1

RESISTORS 1/4W
10 9
22 1
100 13
220 14
470 2
100 lin 1
10k 3
10k lin 2
120k 2
1k 13
220k 1
2k2 1
2k2 9
4k7 3


XTAL
10MHz 5 (10)


TRANSISTOR
BC547 14
or 2N2222

IC
LM386-N1 1


DIODES
36V zener 1
9.1V zener 1
1N4148 13

TRANSFORMERS
INDUCTORS
see text

OTHER
Microphone 1
Loudspeaker 8ohm 1

Re: Atachments

Hans Summers <Hans.Summers@...>
 

i am new ot yahoo groups. i don't know if you can
directly upload the pictures without being a
moderator.
It's definitely possible, I am a member of another group where the members
do post pictures to the photos folder, and don't have to be administrator.
Have a look at the folders on the group home page
http://groups.yahoo.com/group/BITX20

I think the way it works is: if you send an attachment to the group, email
recipients do receive it. But people who have set up their account to not
receive emails, but instead use the web interface, cannot view the photos.
Therefore it's best to use the group folders rather than attach things.

73 Hans G0UPL
http://www.hanssummers.com