Date   

Re: Manual and ordering details for BitX20A Cases now on Hendricks QRP Kits Webpage

wbdmxbaileybobbuttercup
 

I can't open or download the manual for it.


From: KI6DS
Sent: Thursday, October 02, 2008 5:40 PM
To: BITX20@...
Subject: [BITX20] Manual and ordering details for BitX20A Cases now on Hendricks QRP Kits Webpage


My web guru Dean Davis has worked his magic and the ordering details
and manual for the new BitX20A cases are now up on the website.
Check
them out at www.qrpkits.com. Lots of pics in the manual, and you can
see the quality in this case. Now, you can buy a custom case that is
powder coated, punched and ready to go. It is designed to be used
with the KD1JV Digital Dial, and we are selling it in three
flavors: Case only, Case + Digital Dial, and the complete kit +
case + digital dial.

Now the BitX20A is a complete kit. When you finish building it in
the case, you will have a commercial quality kit with digital dial,
labels, everything you need. Plus, the case comes with the soon to
be introduced QRP Bail Kit designed by Ken Locasale. The bail puts
the front of the rig at the perfect angle for viewing.

A quality case has been a goal of mine every since I started with the
BitX20 project almost 2 years ago. Custom cases are very expensive,
but they certainly add the "final touch" to your project.

I did 100 cases in the first run, and how they sell will determine if
there is another run.

Cases will start shipping on Monday.


Manual and ordering details for BitX20A Cases now on Hendricks QRP Kits Webpage

KI6DS <ki6ds@...>
 

My web guru Dean Davis has worked his magic and the ordering details
and manual for the new BitX20A cases are now up on the website.
Check
them out at www.qrpkits.com. Lots of pics in the manual, and you can
see the quality in this case. Now, you can buy a custom case that is
powder coated, punched and ready to go. It is designed to be used
with the KD1JV Digital Dial, and we are selling it in three
flavors: Case only, Case + Digital Dial, and the complete kit +
case + digital dial.

Now the BitX20A is a complete kit. When you finish building it in
the case, you will have a commercial quality kit with digital dial,
labels, everything you need. Plus, the case comes with the soon to
be introduced QRP Bail Kit designed by Ken Locasale. The bail puts
the front of the rig at the perfect angle for viewing.

A quality case has been a goal of mine every since I started with the
BitX20 project almost 2 years ago. Custom cases are very expensive,
but they certainly add the "final touch" to your project.

I did 100 cases in the first run, and how they sell will determine if
there is another run.

Cases will start shipping on Monday.


Re: bitx20v3 or bitx20a?

ki0qs
 

Thanks for the responses. A am ordering the Hendricks kit. May be
back for help.

--- In BITX20@..., "ki0qs" <ki0qs@...> wrote:

I am planning to build the bitx20, but am trying to decide which one to
go with. I have most of the cap's and resistors and some other parts
in the junk box, but only kit I have done is rockmite. Any suggestions
welcome. Clyde


Re: bitx20v3 or bitx20a?

wbdmxbaileybobbuttercup
 

I would strongly your doing the kit, bitx20A from hendrics, as I feel it would be much better to build it when all the parts are there.


From: ki0qs
Sent: Thursday, October 02, 2008 2:54 PM
To: BITX20@...
Subject: [BITX20] bitx20v3 or bitx20a?


I am planning to build the bitx20, but am trying to decide which one to
go with. I have most of the cap's and resistors and some other parts
in the junk box, but only kit I have done is rockmite. Any suggestions
welcome. Clyde


Re: bitx20v3 or bitx20a?

Leonard <bitx@...>
 

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

--- In BITX20@..., "ki0qs" <ki0qs@> wrote:

I am planning to build the bitx20, but am trying to decide which
one
to
go with. I have most of the cap's and resistors and some other
parts
in the junk box, but only kit I have done is rockmite. Any
suggestions
welcome. Clyde
The directions for the 20A kit are far better than the ones for
the
version 3 board.

I'd reconmend the version 3 board as an advanced project, possibly
after you have built the kit and feel pretty confident. Another
advantage of the kit is the power output. It's 10-12 watts
compared to
the version 3's around 5 watts depending on how you do the PA
board. If
you were an experienced builder, it really wouldn't make a lot of
difference but the version 3 board is quite a bit more of
an "adventure".
Leonard

I'll add one more thing. The version 3 board is really nice after
you have sucessfully built the kit as then you may be ready to try
modifications. The version 3 board is spread out a lot more and much
easier to modify.

If you read the forum for a while, you will notice that building a
bitx is a lot like eating a Lays potato chip. "No one can eat just
one". Many of the forum regulars have built several different
frequencies and versions.
Leonard


Re: bitx20v3 or bitx20a?

Leonard <bitx@...>
 

--- In BITX20@..., "ki0qs" <ki0qs@...> wrote:

I am planning to build the bitx20, but am trying to decide which one
to
go with. I have most of the cap's and resistors and some other parts
in the junk box, but only kit I have done is rockmite. Any
suggestions
welcome. Clyde
The directions for the 20A kit are far better than the ones for the
version 3 board.

I'd reconmend the version 3 board as an advanced project, possibly
after you have built the kit and feel pretty confident. Another
advantage of the kit is the power output. It's 10-12 watts compared to
the version 3's around 5 watts depending on how you do the PA board. If
you were an experienced builder, it really wouldn't make a lot of
difference but the version 3 board is quite a bit more of
an "adventure".
Leonard


bitx20v3 or bitx20a?

ki0qs
 

I am planning to build the bitx20, but am trying to decide which one to
go with. I have most of the cap's and resistors and some other parts
in the junk box, but only kit I have done is rockmite. Any suggestions
welcome. Clyde


Re: bitx20a to bitx40??

Cristian Radulescu
 

I've made a BitX40 after the original schematic.
IF 9.99989 MHz(37 Hz match), BFO 10.00152 MHz, VFO 2.900-3.000 KHz. Works great.
BTW, it is the schematic with 1 BC547 (2N3904) in the IF amp.
Cristian, YO3IAZ

--- On Wed, 10/1/08, bruce.taylor57 <bruce.taylor57@...> wrote:

From: bruce.taylor57 <bruce.taylor57@...>
Subject: [BITX20] bitx20a to bitx40??
To: BITX20@...
Date: Wednesday, October 1, 2008, 6:19 PM






To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I know
the bandpass will need to change and the PA lowpass filter as well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who tries to
set me in the right direction KB1OHE Bruce


















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


Re: bitx20a to bitx40??

Arv Evans
 

Bill

You are correct. Many presently available uP based counters usually
have offset negative counting capability, but not the very simplest of
hardware based counters like these units:

<http://www.hanssummers.com/radio/lcdfreq/index.htm>

<http://www.hanssummers.com/radio/sfreq/index.htm>

<http://www.hanssummers.com/electronics/equipment/bcdfreq/index.htm>

<http://www.geocities.com/pa2ohh/sfreq.htm>

<http://www.geocities.com/pa2ohh/cnt7seg.htm>

<http://www.geocities.com/pa2ohh/04sfreq.htm>

My first ugly-construction BITX20 used the LCD counter from Hans G0UPL
web site, but when I built the ugly-construction BITX40 that counter
would not work because the tuning was backwards and the offset was wrong
to use the lower numbers and ignore the MHz part (i.e. 2,700 VFO =
7.300 R & T).

Arv
_._

Bill Noyce wrote:


On Wed, Oct 1, 2008 at 4:33 PM, Arv Evans <arvid.evans@...
<mailto:arvid.evans%40gmail.com>> wrote:

For that build I left the IF at 10 MHz
and used a VFO that tuned 2.7 to 3.0 MHz. This means that the VFO tunes
backwards and thus you cannot use a digital frequency counter for the
dial (I used a mechanical dial arrangement).
Actually, most of the digital frequency counters have provision for
computing your receive frequency either as VFO+IF, VFO-IF, or IF-VFO
(which is what you need here). That includes the KD1JV "Digital Dial"
available from qrpkits.com, the DFD series from AADE.com, and most
others I've seen.
-- Bill, AB1AV


Re: bitx20a to bitx40??

Bill Noyce <WBNoyce@...>
 

On Wed, Oct 1, 2008 at 4:33 PM, Arv Evans <arvid.evans@...> wrote:

For that build I left the IF at 10 MHz
and used a VFO that tuned 2.7 to 3.0 MHz. This means that the VFO tunes
backwards and thus you cannot use a digital frequency counter for the
dial (I used a mechanical dial arrangement).
Actually, most of the digital frequency counters have provision for
computing your receive frequency either as VFO+IF, VFO-IF, or IF-VFO
(which is what you need here). That includes the KD1JV "Digital Dial"
available from qrpkits.com, the DFD series from AADE.com, and most
others I've seen.
-- Bill, AB1AV


Re: bitx20a to bitx40??

Arv Evans
 

Bruce

I have not yet tried converting a BITX20A kit to 40 meters, but when
Farhan first published his BITX20 design I did build a BITX40 version
using ugly-construction method. For that build I left the IF at 10 MHz
and used a VFO that tuned 2.7 to 3.0 MHz. This means that the VFO tunes
backwards and thus you cannot use a digital frequency counter for the
dial (I used a mechanical dial arrangement).

At 7 MHz your output frequency is closer to both IF and VFO frequency
than would be the case at 14 MHz. This then requires that you need to
take care that the transmit drivers and RF PA stages do not readily pass
these unwanted frequencies.

If modifying a BITX20A kit PCB for other than 20 meters, don't forget to
also change the band-pass filter C-25 and L-10 to match your new
transmit frequency.

Arv
_._


bruce.taylor57 wrote:


To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I know
the bandpass will need to change and the PA lowpass filter as well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who tries to
set me in the right direction KB1OHE Bruce


Re: BTX20 mod?

nigelflatman <nigelflatman@...>
 

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

Does anyone know of a way to modify the BTX20 to operate on 10 meters?
I haven't done any building since the late 69's so this is a project
for me.

Paul
Paul

As Jim has pointed out its not that easy.Ive just converted a
Hendricks BITX20A to 17m.Read all about it in this months Sprat,the
journal of the GQRP Club(if you are not a member yet what are you
waiting for,visit www.gqrp.com.)
Receiver performance was up the standard of the 20m version but
output was only 5w.The modified board was found to lose output compared
to the original quite dramatically,and more than you would expect,in
the driver and pa.My modification however just involves substitution of
a few components but no alteration to the design or board itself.
I will upload a file with details of the modifications in the next
few days.
At the end of the day Ive still had qsos and I doubt the other man
could tell the difference between 5 and 10w,but I think you would be
pushing it a bit with a 10m version.

Nigel G0EBQ


Re: bitx20a to bitx40??

wbdmxbaileybobbuttercup
 

ok, man what was I thinking ?
anyway, I stand corrected.
thank you
bob
WB7DMX


From: Mark Jones
Sent: Wednesday, October 01, 2008 1:42 PM
To: BITX20@...
Subject: Re: [BITX20] Re: bitx20a to bitx40??


Hi All

The design relies on the BFO and IF being the same fundemantal
frequency. The BFO is tuned (on the 20 and 20A including the V3) so that
the upper sideband is passing through the crystal filter. The BFO is set
slightly low so that the carrier and hence the LSB is way down the lower
skirt of the crystal filter.

In the design you are taking the audio frequency and mixing it with the
BFO to get the BFO + and - the audio or, put another way, the sum and
the difference (+ all sorts of harmonics!). On the original design
(including the V3 board) the IF and BFO are running at 10MHz and on the
20A it's 11MHz.

This is why the BFO setting is so critical, as the carrier and LSB need
to be way down the lower skirt of the filter with the USB passing through.

The IF frequency is then mixed again with the VFO; on the 20 and V3 this
is 10MHz + 4.something; on the 20A this is 11MHz + 3.something. This
generates the final RF frequency (+ another load of harmonics and other
stuff!) which is filtered again through the band pass filter to leave
the final TX frequency.

But in a nutshell BFO = IF.

Hope this helps,

Mark.

G0MGX

bruce.taylor57 wrote:


the bix20a is 11 Mhtz bfo and IF is as well,,the IF is tuned down
so the side band goes into thr filter???????? Bruce

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, "bob
bailey" <wb7dmx@...> wrote:

the BFO cannot be the same frequency as the IF frequency.
the difference of the vfo and the bfo must be the same frequency
of the IF frequency.


From: bruce.taylor57
Sent: Wednesday, October 01, 2008 11:19 AM
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
Subject: [BITX20] bitx20a to bitx40??


To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I
know
the bandpass will need to change and the PA lowpass filter as
well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who
tries to
set me in the right direction KB1OHE Bruce







----------------------------------------------------------


No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.173 / Virus Database: 270.7.5/1701 - Release Date: 30/09/2008 19:08


Re: bitx20a to bitx40??

Mark Jones <Mark@...>
 

Hi Bruce

There are many ways to mix frequencies to get this design on 40M!
Personally I think I would stick with a 10 or 11MHz IF and subtract (not
add) the VFO to get down to 7MHz.

You might want to Google MKARS80 as this is a BITX based on the BITX20
for 80M using a 10MHz IF and a 6.something VFO. The design is good and
should work well on 40M by halving the VFO frequency and changing the
low-pass and band-pass designs. The PA will probably be OK but might
need experimentation. This design also includes a huff-puff VFO and LCD
frequency display. The software for the VFO control and display is
available for download and modification by the experimenter (I think!).

Worth a go...

Mark.

G0MGX

bruce.taylor57 wrote:


To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I know
the bandpass will need to change and the PA lowpass filter as well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who tries to
set me in the right direction KB1OHE Bruce


------------------------------------------------------------------------


No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.173 / Virus Database: 270.7.5/1701 - Release Date: 30/09/2008 19:08


Re: bitx20a to bitx40??

Mark Jones <Mark@...>
 

Hi All

The design relies on the BFO and IF being the same fundemantal
frequency. The BFO is tuned (on the 20 and 20A including the V3) so that
the upper sideband is passing through the crystal filter. The BFO is set
slightly low so that the carrier and hence the LSB is way down the lower
skirt of the crystal filter.

In the design you are taking the audio frequency and mixing it with the
BFO to get the BFO + and - the audio or, put another way, the sum and
the difference (+ all sorts of harmonics!). On the original design
(including the V3 board) the IF and BFO are running at 10MHz and on the
20A it's 11MHz.

This is why the BFO setting is so critical, as the carrier and LSB need
to be way down the lower skirt of the filter with the USB passing through.

The IF frequency is then mixed again with the VFO; on the 20 and V3 this
is 10MHz + 4.something; on the 20A this is 11MHz + 3.something. This
generates the final RF frequency (+ another load of harmonics and other
stuff!) which is filtered again through the band pass filter to leave
the final TX frequency.

But in a nutshell BFO = IF.

Hope this helps,

Mark.

G0MGX

bruce.taylor57 wrote:



the bix20a is 11 Mhtz bfo and IF is as well,,the IF is tuned down
so the side band goes into thr filter???????? Bruce

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, "bob
bailey" <wb7dmx@...> wrote:

the BFO cannot be the same frequency as the IF frequency.
the difference of the vfo and the bfo must be the same frequency
of the IF frequency.


From: bruce.taylor57
Sent: Wednesday, October 01, 2008 11:19 AM
To: BITX20@... <mailto:BITX20%40yahoogroups.com>
Subject: [BITX20] bitx20a to bitx40??


To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I
know
the bandpass will need to change and the PA lowpass filter as
well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who
tries to
set me in the right direction KB1OHE Bruce







------------------------------------------------------------------------


No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.173 / Virus Database: 270.7.5/1701 - Release Date: 30/09/2008 19:08


Re: bitx20a to bitx40??

bruce.taylor57
 

the bix20a is 11 Mhtz bfo and IF is as well,,the IF is tuned down
so the side band goes into thr filter???????? Bruce



--- In BITX20@..., "bob bailey" <wb7dmx@...> wrote:

the BFO cannot be the same frequency as the IF frequency.
the difference of the vfo and the bfo must be the same frequency
of the IF frequency.


From: bruce.taylor57
Sent: Wednesday, October 01, 2008 11:19 AM
To: BITX20@...
Subject: [BITX20] bitx20a to bitx40??


To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I
know
the bandpass will need to change and the PA lowpass filter as
well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who
tries to
set me in the right direction KB1OHE Bruce





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


Re: bitx20a to bitx40??

wbdmxbaileybobbuttercup
 

the BFO cannot be the same frequency as the IF frequency.
the difference of the vfo and the bfo must be the same frequency of the IF frequency.


From: bruce.taylor57
Sent: Wednesday, October 01, 2008 11:19 AM
To: BITX20@...
Subject: [BITX20] bitx20a to bitx40??


To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I know
the bandpass will need to change and the PA lowpass filter as well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who tries to
set me in the right direction KB1OHE Bruce


bitx20a to bitx40??

bruce.taylor57
 

To anyone,
Can I use 4Mhtz BFO and 4 Mhtz IF filter,, with 3 Mhtz VFO??? I know
the bandpass will need to change and the PA lowpass filter as well????
I think this approch has the lease amount of changes needed??? Has
anyone tryed to convert a Bitx20a to 40?? Thanks to anyone who tries to
set me in the right direction KB1OHE Bruce


Re: Ver. 3 Linear Amp/Power Supply board Schematic??

wbdmxbaileybobbuttercup
 

the T37-6 cores work great with 13 turns in the output filters.

bob
WB7DMX


From: Leonard
Sent: Wednesday, October 01, 2008 8:05 AM
To: BITX20@...
Subject: [BITX20] Re: Ver. 3 Linear Amp/Power Supply board Schematic??


--- In BITX20@..., "jared63401" <jared63401@...> wrote:

Leonard, I was referring to the electrolytic capacitor substitute
and the toroids used
instead of the "binocular" cores. As an inexperienced builder I
panicked a bit when I saw
something different in your pictures than I saw on the layout. Ha!
But, anyways, I went to
Farhan's site where I saw the schematic for the power board. I
didn't have that in my
printed material for some reason. So mystery solved!
The cap substitute was simply for space on the board. You could use
almost any large electrolytic as long as the working voltage is
sufficient.

I had an error on the pa board,
http://golddredgervideo.com/kc0wox/bitxver3/linearamp.htm ,pointed
out to me the other day. I had the wrong torroid cores listed for
the output filter. If you used the one's I had listed, you would
have about 60uh each instead of .55uh and it probably won't work at
all. They should be T37-6 cores. I used them because I was
unfamiliar with the type of core material that came with the board.
I'll be doing some tests with the supplied cores and figuring out
the turns required to use them when I get the new board set that I
ordered.

Leonard


Re: Ver. 3 Linear Amp/Power Supply board Schematic??

Leonard <bitx@...>
 

--- In BITX20@..., "jared63401" <jared63401@...> wrote:

Leonard, I was referring to the electrolytic capacitor substitute
and the toroids used
instead of the "binocular" cores. As an inexperienced builder I
panicked a bit when I saw
something different in your pictures than I saw on the layout. Ha!
But, anyways, I went to
Farhan's site where I saw the schematic for the power board. I
didn't have that in my
printed material for some reason. So mystery solved!
The cap substitute was simply for space on the board. You could use
almost any large electrolytic as long as the working voltage is
sufficient.

I had an error on the pa board,
http://golddredgervideo.com/kc0wox/bitxver3/linearamp.htm ,pointed
out to me the other day. I had the wrong torroid cores listed for
the output filter. If you used the one's I had listed, you would
have about 60uh each instead of .55uh and it probably won't work at
all. They should be T37-6 cores. I used them because I was
unfamiliar with the type of core material that came with the board.
I'll be doing some tests with the supplied cores and figuring out
the turns required to use them when I get the new board set that I
ordered.

Leonard