Date   
Re: BITX on other bands (was: Updated schematic and or PCB Layout drawing)

sigcom1
 

That is correct. The filter's slope on the low side 'slices' off the
unwanted sideband. The only hitch in moving the carrier oscillator
to the high side might be the shape of the filter. As it is it would
need to be fairly symetrical. Someone here has measured the filter
response, no?

73.......Steve Smith WB6TNL

--- In BITX20@..., Jim

<n6otq@...> wrote:

I may be mistaken on this, but I recall that the carrier oscillator
for
the 10 MHz crystal filter is set below the bandpass frequency to
generate USB on 20M. So to get LSB, you should be able to use a
carrier osc ABOVE 10 MHz for 20M.

I'm hoping somebody will step in right here and explain the
relationship between the filter bandpass, the carrier osc frequency,
the VFO range, and the sideband developed/detected for BITX. Arv?

Jim N6OTQ

Re: need an assembled & complete bitx.....

yellow_kite
 

Thats what happens when you remove morse requirement from license.

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

hello every one....i am new to ham radios and i live in india......
the company made rigs are very costly and are for experts....
almost a month ago i came across the bitx through information at web....
i know that there are kits available of bitx on net,,but my problem is
that i dont have any experience and intruments for building a
transceiver,,,,
so i am eagerly searching for a person who can provide me a bitx20a or
the bitx20 version-3 transceiver with a 100 watt's linear + a digital
frequency counter + a cw tone all fitted in a compact cabinet...

i will pay the desired cost for producing this rig for me.....
so please contact me at --- shubhamforme@...
my mob no for indian's - --- 0-9907249249
and for dx --- 0091-9907249249
regards
shubham

Re: BITX on other bands

Jim Tonne <tonne@...>
 

Arv wrote:

Yet another possibility might be to re-design the rig so that it uses phasing method to generate and detect SSB. This would all be done at the IF frequency,
Gents - if you are considering the phasing method, then be sure to
consider doing it with opamps, resistors and capacitors for the audio
portion of it. Very predictable, can be inexpensive, quality level is
negotiable (quality versus complexity) and the program to design those
networks is free. See all about it here:
http://tonnesoftware.com/quad.html

Click on download to go further.

Hope this helps!

- Jim WB6BLD

Re: BITX on other bands

Arv Evans
 

Jim

I'm not the expert in this area, but my observation was that my filter
sideband is steeper on the low side than on the upper side. This would
seem to make just moving the carrier oscillator a few KHz in order to
switch from USB to LSB a less desirable approach. However, some people
have experimented with more poles in the crystal filter, and I wonder if
this might get us a filter with an upper edge that is steep enough for
LSB through the filter.

Alternatively, we might use a lattice filter with selected crystals to
make both USB and LSB filters that could be switched in or out. Problem
with this idea is that it would mean we need specialty crystals instead
of the mass produced ones that are much cheaper and easier to obtain.

With VXOs, DDS, or H&P stabilized VFOs it is probably not unreasonable
to move the VFO higher in frequency (above the IF ) as a means to obtain
LSB with the present crystal filter arrangement.

Yet another possibility might be to re-design the rig so that it uses
phasing method to generate and detect SSB. This would all be done at
the IF frequency, and could use technique like that shown on page 9.10
through 9.16 of EMRFD (Experimental Methods in RF Design). From my
limited experiments it seems possible to use surplus 600:600 ohm AF
transformers for the audio phasing networks (salvaged line transformers
from old modems might also work?), and T37-6 toroids for the RF phasing
networks. Going to a phasing scheme would eliminate need for the IF
filter and it's insertion loss.

Arv
_._


Jim wrote:


I may be mistaken on this, but I recall that the carrier oscillator for
the 10 MHz crystal filter is set below the bandpass frequency to
generate USB on 20M. So to get LSB, you should be able to use a
carrier osc ABOVE 10 MHz for 20M.

I'm hoping somebody will step in right here and explain the
relationship between the filter bandpass, the carrier osc frequency,
the VFO range, and the sideband developed/detected for BITX. Arv?

Jim N6OTQ

--- sigcom1 <sigcom@... <mailto:sigcom%40juno.com>> wrote:

Of course, simply subtracting a 3 MHz VFO from the 10 MHz USB
sideband generator used in the BITX20 would create a 40 meter signal
but it would not invert the sideband to LSB. This situation is the
same with any SSB generator that does not have capability of
selecting sidebands irregardless of the generator's suppressed
carrier frequency. In the case of 40 meters using the BITX's 10 MHz
sideband generator, to flip the sideband to LSB the VFO would need to

be -above- the sideband generator or 17 MHz. Example: A 1 KHz audio

tone into a 10 MHz USB generator results in a 10.001 MHz signal
(USB). Subtracting 3.0 MHz from 10.001 the resulting difference is
7.001 MHz, still USB. 17 MHz minus 10.001 equals 6.999 MHz (LSB).
However, a 17 MHz VFO might not be very practical so making the SSB
generator LSB or selectable sidebands would be a better way to go,
IMO.

73.......Steve Smith WB6TNL

--- In BITX20@... <mailto:BITX20%40yahoogroups.com>, Jim
<n6otq@...> wrote:
Although BITX will work on almost any HF frequency as long as you
do
your arithmetic. The convention for amateur radio is that
the "normal"
sideband assumes a 9 MHz filter and additive or subtractive
oscillators
to hit the ham bands. Anything mixed to above 9 MHz uses upper
sideband, and anything mixed to below 9 MHz uses lower sideband as
the
"normal" sideband.

Jim N6OTQ

--- Jim Tonne <tonne@...> wrote:


Jim n6otq wrote:

For a 40 MHz BITX
with a 10 MHz filter, use a 3 MHz VFO and take the subtractive
mixer
product.
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======================================

Re: BITX on other bands (was: Updated schematic and or PCB Layout drawing)

Jim <n6otq@...>
 

I may be mistaken on this, but I recall that the carrier oscillator for
the 10 MHz crystal filter is set below the bandpass frequency to
generate USB on 20M. So to get LSB, you should be able to use a
carrier osc ABOVE 10 MHz for 20M.

I'm hoping somebody will step in right here and explain the
relationship between the filter bandpass, the carrier osc frequency,
the VFO range, and the sideband developed/detected for BITX. Arv?

Jim N6OTQ

--- sigcom1 <sigcom@...> wrote:

Of course, simply subtracting a 3 MHz VFO from the 10 MHz USB
sideband generator used in the BITX20 would create a 40 meter signal
but it would not invert the sideband to LSB. This situation is the
same with any SSB generator that does not have capability of
selecting sidebands irregardless of the generator's suppressed
carrier frequency. In the case of 40 meters using the BITX's 10 MHz
sideband generator, to flip the sideband to LSB the VFO would need to

be -above- the sideband generator or 17 MHz. Example: A 1 KHz audio

tone into a 10 MHz USB generator results in a 10.001 MHz signal
(USB). Subtracting 3.0 MHz from 10.001 the resulting difference is
7.001 MHz, still USB. 17 MHz minus 10.001 equals 6.999 MHz (LSB).
However, a 17 MHz VFO might not be very practical so making the SSB
generator LSB or selectable sidebands would be a better way to go,
IMO.

73.......Steve Smith WB6TNL

--- In BITX20@..., Jim <n6otq@...> wrote:
Although BITX will work on almost any HF frequency as long as you
do
your arithmetic. The convention for amateur radio is that
the "normal"
sideband assumes a 9 MHz filter and additive or subtractive
oscillators
to hit the ham bands. Anything mixed to above 9 MHz uses upper
sideband, and anything mixed to below 9 MHz uses lower sideband as
the
"normal" sideband.

Jim N6OTQ

--- Jim Tonne <tonne@...> wrote:


Jim n6otq wrote:

For a 40 MHz BITX
with a 10 MHz filter, use a 3 MHz VFO and take the subtractive
mixer
product.


____________________________________________________________________________________
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Re: need an assembled & complete bitx.....

shubhamforme <shubhamforme@...>
 

i am a ham student and had recently given my ham exam,,,and have passed
but my call sign has not been alloted to me yet,,,,but u can have my
teacher's call sign---'vu2jau'
73

Re: need an assembled & complete bitx.....

ah6gi
 

--- In BITX20@..., "Greg W:-)" <onegammyleg@...> wrote:

Is it just me , but does anyone else think this is odd
I'm looking over at my old reliable ICOM IC-720A. These are not too
pricey on the Bay.

I'm uploading the final of my block diagram and will take down the
earlier copies. This is a black and white landscape image that should
print well on any graphics printer, laser, inkjet, or dot matrix even.

de ah6gi/4

Re: need an assembled & complete bitx.....

 

I have a neighbor who thinks a KW is QRP!

Is it just me , but does anyone else think this is odd

gW:-)

===================================================================

so i am eagerly searching for a person who can provide me a bitx20a or
the bitx20 version-3 transceiver with a 100 watt's linear + a digital
frequency counter + a cw tone all fitted in a compact cabinet...
--
Raj, vu2zap
Bengaluru, South India.

Re: need an assembled & complete bitx.....

Radhakrishnan R. <rk@...>
 

A 0.1KW QRP rig :)
rk

----- Original Message -----
From: "Greg W:-)" <onegammyleg@...>
To: <BITX20@...>
Sent: Wednesday, December 05, 2007 5:29 PM
Subject: [BITX20] Re: need an assembled & complete bitx.....


Is it just me , but does anyone else think this is odd

gW:-)

===================================================================

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

hello every one....i am new to ham radios and i live in india......
the company made rigs are very costly and are for experts....
almost a month ago i came across the bitx through information at web....
i know that there are kits available of bitx on net,,but my problem is that i dont have any experience and intruments for building a transceiver,,,,
so i am eagerly searching for a person who can provide me a bitx20a or the bitx20 version-3 transceiver with a 100 watt's linear + a digital frequency counter + a cw tone all fitted in a compact cabinet...
i will pay the desired cost for producing this rig for me.....
so please contact me at --- shubhamforme@...
my mob no for indian's - --- 0-9907249249
and for dx --- 0091-9907249249
regards
shubham

Re: need an assembled & complete bitx.....

john.brewer@...
 

I think it's called an IC-718 !






"Greg W:-)"
<onegammyleg@...
> To
Sent by: BITX20@...
BITX20@... cc

Subject
12/05/2007 06:59 AM [BITX20] Re: need an assembled & complete
bitx.....

Please respond to
BITX20@...







Is it just me , but does anyone else think this is odd

gW:-)

===================================================================

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

hello every one....i am new to ham radios and i live in india......
the company made rigs are very costly and are for experts....
almost a month ago i came across the bitx through information at web....
i know that there are kits available of bitx on net,,but my problem is
that i dont have any experience and intruments for building a
transceiver,,,,
so i am eagerly searching for a person who can provide me a bitx20a or
the bitx20 version-3 transceiver with a 100 watt's linear + a digital
frequency counter + a cw tone all fitted in a compact cabinet...

i will pay the desired cost for producing this rig for me.....
so please contact me at --- shubhamforme@...
my mob no for indian's - --- 0-9907249249
and for dx --- 0091-9907249249
regards
shubham




Yahoo! Groups Links




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________________________________________________________________________

Re: need an assembled & complete bitx.....

Radhakrishnan R. <rk@...>
 

Hi shubhamforme,
What is your call sign and where are you located?
73s
rk

----- Original Message -----
From: "shubhamforme" <shubhamforme@...>
To: <BITX20@...>
Sent: Wednesday, December 05, 2007 4:12 PM
Subject: [BITX20] need an assembled & complete bitx.....

Re: need an assembled & complete bitx.....

Greg W:-) <onegammyleg@...>
 

Is it just me , but does anyone else think this is odd

gW:-)

===================================================================

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

hello every one....i am new to ham radios and i live in india......
the company made rigs are very costly and are for experts....
almost a month ago i came across the bitx through information at web....
i know that there are kits available of bitx on net,,but my problem is
that i dont have any experience and intruments for building a
transceiver,,,,
so i am eagerly searching for a person who can provide me a bitx20a or
the bitx20 version-3 transceiver with a 100 watt's linear + a digital
frequency counter + a cw tone all fitted in a compact cabinet...

i will pay the desired cost for producing this rig for me.....
so please contact me at --- shubhamforme@...
my mob no for indian's - --- 0-9907249249
and for dx --- 0091-9907249249
regards
shubham

new simple generator SSB using 2 x NE612 in RX and TX from 2 and 160 meter

bernard mourot
 

SSB Generator one new and simple concept in TX and RX
2x NE612 common in TX and RX files is in files Bitx20 schematic,
and print circuit

The generator SSB Bingo is an extensive resource for making the SSB
with the issue or receipt, it is presented on a circuit board used
components are very common filter Quartz is identical to Bitx20
But it is about 10,240 Mhz without the problems of 10 mHz. This
generator has the SSB BF, the BF is automatically zero emission, a
GAC in receipt of a filter quartz single switched diode, the emission
coming from the reverse voltage is broadcast reception.
Ilfaut provide a VFO or VXO outside a floor for incoming and HF band
filter and a Driver + PA And filters + band pass filter -bas output
and the relay antenna is. We use the PA of Mosfet IRF530 or IRF510;
with our PA power on working 70 W HF out on 40 and 80 under 24 v.

73

F6BCU manager from groupe BINGO qrp french yahoo group

New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/TX.exe
Uploaded by : shubhamforme <shubhamforme@...>
Description : 100 WATT'S SSB LINEAR + MORE CIRCUITS

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/shubham%20tiwari/TX.exe

To learn more about file sharing for your group, please visit:
http://help.yahoo.com/help/us/groups/files

Regards,

shubhamforme <shubhamforme@...>

New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/LED Power Indicator.pdf
Uploaded by : shubhamforme <shubhamforme@...>
Description : LED POWER INDICATOR

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/shubham%20tiwari/LED%20Power%20Indicator.pdf

To learn more about file sharing for your group, please visit:
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Regards,

shubhamforme <shubhamforme@...>

New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/CW module.pdf
Uploaded by : shubhamforme <shubhamforme@...>
Description : CW MODULE

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/shubham%20tiwari/CW%20module.pdf

To learn more about file sharing for your group, please visit:
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Regards,

shubhamforme <shubhamforme@...>

New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/BITXmod.pdf
Uploaded by : shubhamforme <shubhamforme@...>
Description : A SIMPLE MOD

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/shubham%20tiwari/BITXmod.pdf

To learn more about file sharing for your group, please visit:
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Regards,

shubhamforme <shubhamforme@...>

New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/LEDcir1.gif
Uploaded by : shubhamforme <shubhamforme@...>
Description : SWR -SIGNAL LEVEL METER

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/shubham%20tiwari/LEDcir1.gif

To learn more about file sharing for your group, please visit:
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New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/Pwr.gif
Uploaded by : shubhamforme <shubhamforme@...>
Description : CHEAP DC POWER SUPPLY

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New file uploaded to BITX20

BITX20@...
 

Hello,

This email message is a notification to let you know that
a file has been uploaded to the Files area of the BITX20
group.

File : /shubham tiwari/nimh charger.gif
Uploaded by : shubhamforme <shubhamforme@...>
Description : 12V NIMH OR BATTERY CHARGER FOR HANDY BITX20

You can access this file at the URL:
http://groups.yahoo.com/group/BITX20/files/shubham%20tiwari/nimh%20charger.gif

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