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BITX20 VFO works; freq coverage question 3 messages
Hello all,
I have successfully got the VFO working for the BITX20. However
some questions remain, wondering if I can get some help, comments and
advice from the group:
1. The coil has 115turns. I am
Hello all,
I have successfully got the VFO working for the BITX20. However
some questions remain, wondering if I can get some help, comments and
advice from the group:
1. The coil has 115turns. I am
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By null1969
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Welcome
Hi
Welcome to 100'th member PY2JCM who has just joined! Welcome also to all the
other recently joined members. If you are building the BITX20 or are
thinking of doing it, and haven't posted here yet,
Hi
Welcome to 100'th member PY2JCM who has just joined! Welcome also to all the
other recently joined members. If you are building the BITX20 or are
thinking of doing it, and haven't posted here yet,
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By
Hans Summers
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CW,T/R pop, modifications 9 messages
Thanks Chris, Arv and Ashhar for comments and advice re the squeak.
I have checked and the relevant diode is in place. I removed the
decoupling electrolytic cap. from pin 6 of the LM386. Interestingl
Thanks Chris, Arv and Ashhar for comments and advice re the squeak.
I have checked and the relevant diode is in place. I removed the
decoupling electrolytic cap. from pin 6 of the LM386. Interestingl
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By
market10gardener
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Mixer question 3 messages
Hi all,
I have a quick question on the mixer transformers used in the
BITX20, I can benefit from others' experience. When I started the
trifilar winding I noticed that it is quite easy to "braid" th
Hi all,
I have a quick question on the mixer transformers used in the
BITX20, I can benefit from others' experience. When I started the
trifilar winding I noticed that it is quite easy to "braid" th
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By null1969
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bitx20 new member 6 messages
Hi, I saw the circuit diagram on the internet in July and thought it would be an ideal hf project. I have been collecting all the parts but will not start building it until my Open University course f
Hi, I saw the circuit diagram on the internet in July and thought it would be an ideal hf project. I have been collecting all the parts but will not start building it until my Open University course f
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By
py1pe@...
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New file uploaded to 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 : /tokoturns.txt
Uploaded by : vu3wjm <vu3wjm@...>
Des
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 : /tokoturns.txt
Uploaded by : vu3wjm <vu3wjm@...>
Des
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By
BITX20@...
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Coil data for TOKO 10K type former 3 messages
Dear Friends,
While going thru my old files I found this small text giving turns
vs inductance for TOKO coils ( Uploaded under files). This is not my
work but of an unknown person to whom I am grea
Dear Friends,
While going thru my old files I found this small text giving turns
vs inductance for TOKO coils ( Uploaded under files). This is not my
work but of an unknown person to whom I am grea
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By Rahul Srivastava
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New file uploaded to 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 : /MODIFICATIONS/BITX DC Switching.png
Uploaded by : k7
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 : /MODIFICATIONS/BITX DC Switching.png
Uploaded by : k7
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By
BITX20@...
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New file uploaded to 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 : /BITX PCBs (Printed Circuit Boards)/bitx_component_pla
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 : /BITX PCBs (Printed Circuit Boards)/bitx_component_pla
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By
BITX20@...
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PCB Parts Layout 4 messages
EB7HPM
The new PCB layout looks interesting.
How did you design the RIT circuit? Could you upload a schematic of
the RIT part of your unit?
Thanks,
Arv-K7HKL
EB7HPM
The new PCB layout looks interesting.
How did you design the RIT circuit? Could you upload a schematic of
the RIT part of your unit?
Thanks,
Arv-K7HKL
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By
Arvid Evans
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Another RIT Circuit...
Hi
A new RIT circuit drawing has been added to
<BITX20/Files/Modifications/K8IQY RIT Circuit.png>
This one is a bit simpler than my earlier circuit, and in true
BITX style this design uses an NPN t
Hi
A new RIT circuit drawing has been added to
<BITX20/Files/Modifications/K8IQY RIT Circuit.png>
This one is a bit simpler than my earlier circuit, and in true
BITX style this design uses an NPN t
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By
Arvid Evans
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Ideas on using BITX20 for PSK31 2 messages
Hello all,
I have not seen any practical designs for using BITX20 for PSK31
mode. I am still working on completing the assembly but would like to
learn more about what mods can be incorporated as I
Hello all,
I have not seen any practical designs for using BITX20 for PSK31
mode. I am still working on completing the assembly but would like to
learn more about what mods can be incorporated as I
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By null1969
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Progress with BITX 3 messages
Hi
I'm pleased to say that my BITX20 is now complete and it performs
exactly as described. With my 132' doublet it has received excellent
reports incuding 59 from PJ4 in one direction and UN7 in the
Hi
I'm pleased to say that my BITX20 is now complete and it performs
exactly as described. With my 132' doublet it has received excellent
reports incuding 59 from PJ4 in one direction and UN7 in the
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By
Charles Darley
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New file uploaded to 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 : /desna.gif
Uploaded by : vu3wjm <vu3wjm@...>
Descrip
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 : /desna.gif
Uploaded by : vu3wjm <vu3wjm@...>
Descrip
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By
BITX20@...
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New file uploaded to 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 : /MODIFICATIONS/Schema VXO.gif
Uploaded by : vdberghak
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 : /MODIFICATIONS/Schema VXO.gif
Uploaded by : vdberghak
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By
BITX20@...
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BITX20 Photos 3 messages
Greetings fellow BITX20 Builders. I have just uploaded some photos
of my BITX20 in the newly completed homebrew enclosure. Still need
to add the sides and top but the hard part is mostly done.
This
Greetings fellow BITX20 Builders. I have just uploaded some photos
of my BITX20 in the newly completed homebrew enclosure. Still need
to add the sides and top but the hard part is mostly done.
This
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By
kaliediscope2004
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LED Frequency Display
Hi folks,
I don't know if this will interest anyone. But I have just obtained a
fairly large quantity of minature multiplexed 7 segment LED displays.
They have 7 numeric characters and 7 'S' meter, l
Hi folks,
I don't know if this will interest anyone. But I have just obtained a
fairly large quantity of minature multiplexed 7 segment LED displays.
They have 7 numeric characters and 7 'S' meter, l
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By
Mike W
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Extra capacitors in your BITX...? 9 messages
Hello
As I sit here looking at the BITX20 schematic it 0ccured to me that
some of the capacitors may not be necessary:
1) There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
the collecto
Hello
As I sit here looking at the BITX20 schematic it 0ccured to me that
some of the capacitors may not be necessary:
1) There is a 0.1 mf on the base of Q1, that connects to a 0.1 on
the collecto
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By
Arvid Evans
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LED Display - More Info 4 messages
Hi folks,
A little further info on the LED display I have available.
Common Kathode .
Size 36mm x 20mm
7 Multiplexed numeric characters
7 _NON _ multiplexed leds in a bargraph.
They are ideal fo
Hi folks,
A little further info on the LED display I have available.
Common Kathode .
Size 36mm x 20mm
7 Multiplexed numeric characters
7 _NON _ multiplexed leds in a bargraph.
They are ideal fo
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By
Mike W
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request regarding asoc examination. 2 messages
Respected sir,
With due respect I beg to say that I am preparing for ASOC grade-1
and advance grade examination. Recently I was appeared in ASOC grade-
1 and grade-2 examination, which was held on 08/
Respected sir,
With due respect I beg to say that I am preparing for ASOC grade-1
and advance grade examination. Recently I was appeared in ASOC grade-
1 and grade-2 examination, which was held on 08/
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By
fromgautam
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