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Re: Raduino Sketch MIA?
I will put a full page on Raduino by the end of this week. It is quite a flexible board that has a lot of possibilities. For instance, you can easily make an antenna analyzer out of it. - f On Mon, Jan 16, 2017 at 12:21 PM, M Garza <mgarza896@...> wrote:
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Re: Idea for future versions of BITX
Over the last few days, someone posted they had it working on 180m and someone else on 80m. I don't recall who it was without going through the postings. Sometime ago, Ashhar hinted at replacing the 100 pf caps of the BPF with 22pf for 20m. So I am in the process of building an off-board BPF for 40m/20m. I am just waiting for caps to arrive to try it. I know almost nothing on BPF/LPF design so I have been doing some reading. I had a friend model the present 40m and 20m in Ltspice, which I don't understand how to use, and said the plots were very good. So that is where I am with the Bitx40. 73 Ken VA3ABN On Sun, Jan 15, 2017 at 11:25 PM, VE7BEE <obeebe@...> wrote: Continuing on the idea of a conversion kit : What one would be the easiest to do ? 80 M ? 20 M ?? If this is the case , what would be the minimum requirements for modification to 80 m ? for example . If some one has information on a conversion to 80 m please share what you have . The BITX40 Team I am sure have their hands full and do not want anyone to think this idea is to put pressure for a secondary band kit . that is not the case.? I am thinking that if there is enough interest in a conversion kit , maybe some of us can put our heads together and come up with a parts list for a couple of different bands to start with . Rewinding the existing toroids or getting some extra toroids and rewinding them should not be too hard. I have already played with the VFO and it is still reasonably stable at 10 MHZ . ( conversion to 160 M) . I have not had time to sit down and figure out the LPF and BPF as of yet.? |
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Re: Raduino Sketch MIA?
M Garza
The Raduino sketch is located at? 73s Marco - KG5PRT On Jan 16, 2017 12:34 AM, "Lawrence Macionski via Groups.Io" <am_fm_radio=yahoo.com@groups.
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Re: Idea for future versions of BITX
Continuing on the idea of a conversion kit : What one would be the easiest to do ? 80 M ? 20 M ? ?If this is the case , what would be the minimum requirements for modification to 80 m ? for example . If some one has information on a conversion to 80 m please share what you have . The BITX40 Team I am sure have their hands full and do not want anyone to think this idea is to put pressure for a secondary band kit . that is not the case. ?I am thinking that if there is enough interest in a conversion kit , maybe some of us can put our heads together and come up with a parts list for a couple of different bands to start with . Rewinding the existing toroids or getting some extra toroids and rewinding them should not be too hard. I have already played with the VFO and it is still reasonably stable at 10 MHZ . ( conversion to 160 M) . I have not had time to sit down and figure out the LPF and BPF as of yet.?
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Re: Idea for future versions of BITX
If you want a board like this, check out the MST3 kit. Rgds, ? On 2017-01-16 07:27 AM, VE7BEE wrote:
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Re: Idea for future versions of BITX
The input/output filter area could have a line of through hole pads where one can solder a pin socket like
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that of a pro IC socket. These holes should be exactly multiples of 0.1". Small low profile daughter boards can be made to take different band filters. With this you can actually switch bands with ease. something like these, here we get long single line strips. At 16/01/2017, you wrote:
The idea of having one board with all the basic functions on it and adding plug in BPF and LPF filters to change operating bands has merit . This would allow hams from all over the world to "plug in " the filters for the ham band that is the most popular and Any additional thoughts on this ? |
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Re: Idea for future versions of BITX
I love the idea of a conversion kit I'd order one if it was made available. 73 Ken VA3ABN On Sun, Jan 15, 2017 at 3:27 PM, VE7BEE <obeebe@...> wrote:
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Re: Idea for future versions of BITX
开云体育I like the idea of a “building block” BITX that can be ordered at a low price from Ashhar’s team. ? But look at from another direction. Ashhar and his colleagues supply us with a low cost, tested, fully functional QRP transceiver board for one band. That band is chosen with the present propagation situation in mind. The basic concept has a lot of room for improvements, hacks, modifications and experiments. that we can perform ourselves. Not all of us have the same capabilities to do so of course, but with all the support in this group from other group members who share their results with us, we all could do something if we want more than the basic features. ? We should be very reluctant to come up with an extensive wish list. I am a development engineer myself, I know how much time, energy and also money is to be invested in a project like this. So let us be grateful for what Ashhar is doing now and not press him in doing more than he wants himself. ? Cor PA4Q ? From: [email protected] [mailto:[email protected]] On Behalf Of VE7BEE ? The idea of having one board with all the basic functions on it and adding plug in BPF and LPF filters to change operating bands has merit . This would allow hams from all over the world to "plug in " the filters for the ham band that is the most popular and active in their part of the world. ?For example , I would like to be able to operate 160 m QRP at night as there is quite a bit of activity on the west coast of USA and Canada at the moment on 160 . The advantage of plug in modules., is that you would have the option to go back to "40m " if one wanted to do so . The alternative , would be to come up with a conversion?list specifying the parts to be replaced and the values required for operation of the BITX40 board on the different ham bands. The issue with this is that the parts required are not always readily available locally to a lot of hams around the world. ?I view the BITX40 as a Global Experimental Radio Project ( GERP ) and as such , to maximize the opportunities to experiment with the board , I think a conversion kit to other radio bands makes the most sense. If a conversion kit was made available, 160 M conversion (for example) . ?Once the conversion kit was received , one could modify the BITX board following some basic instructions to the new band of interest , with the option to convert back if one wanted to do so at a later date . The addition of conversion kits for other bands, should enhance the amount of interest in the BITX40 as a global basic platform for amateur radio enthusiasts to experiment with around the world.? Any additional thoughts on this ? |
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Re: Idea for future versions of BITX
I gather what you are saying and think that any experimentation is a great thing. Perhaps those that mod their Bitx40 for other bands would share their data/results. That way those interested in a particular band could build for that band. If however you are going multiband there is already several designs out there that accomplish that with little or no extra component count and a board the same size or not much bigger. Most people are probably going to use an Arduino based AD9850 or Si5351 to run their VFO so band switching BPF/LPF is taken care of right there. Several different designs of BPF and LPF boards are already in use. Yhis leaves really only the PA and maybe some controls to figure out. I dont know if you have looked at it yet or not but there are two files under the files section that you may want to peruse. One is by Elia Mady M0ZHN and is a BitX based Multi Band exciter. The other is a BitX based exciter by Andy G6LBQ. I myself at the moment am working on a SMD board based on Elia's design without the audio amp or AGC or Microphone amp so that I may experiment with different designs and see what works best for me. The board is 4in by 4in. I am also working on a board for myself based upon Andy's Multband BitX that uses SMD. ?Maybe you can get some ideas or tips from their files. I have had some good reading from them. I do apologize if you already knew this or had seen it already.? Best wishes and good luck with all your projects. ? Ian K3HQL On Sunday, January 15, 2017 2:27 PM, VE7BEE <obeebe@...> wrote: The idea of having one board with all the basic functions on it and adding plug in BPF and LPF filters to change operating bands has merit . This would allow hams from all over the world to "plug in " the filters for the ham band that is the most popular and active in their part of the world. ?For example , I would like to be able to operate 160 m QRP at night as there is quite a bit of activity on the west coast of USA and Canada at the moment on 160 . The advantage of plug in modules., is that you would have the option to go back to "40m " if one wanted to do so . The alternative , would be to come up with a conversion?list specifying the parts to be replaced and the values required for operation of the BITX40 board on the different ham bands. The issue with this is that the parts required are not always readily available locally to a lot of hams around the world. ?I view the BITX40 as a Global Experimental Radio Project ( GERP ) and as such , to maximize the opportunities to experiment with the board , I think a conversion kit to other radio bands makes the most sense. If a conversion kit was made available, 160 M conversion (for example) . ?Once the conversion kit was received , one could modify the BITX board following some basic instructions to the new band of interest , with the option to convert back if one wanted to do so at a later date . The addition of conversion kits for other bands, should enhance the amount of interest in the BITX40 as a global basic platform for amateur radio enthusiasts to experiment with around the world.? Any additional thoughts on this ?
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Re: Idea for future versions of BITX
The idea of having one board with all the basic functions on it and adding plug in BPF and LPF filters to change operating bands has merit . This would allow hams from all over the world to "plug in " the filters for the ham band that is the most popular and active in their part of the world. ?For example , I would like to be able to operate 160 m QRP at night as there is quite a bit of activity on the west coast of USA and Canada at the moment on 160 . The advantage of plug in modules., is that you would have the option to go back to "40m " if one wanted to do so . The alternative , would be to come up with a conversion?list specifying the parts to be replaced and the values required for operation of the BITX40 board on the different ham bands. The issue with this is that the parts required are not always readily available locally to a lot of hams around the world. ?I view the BITX40 as a Global Experimental Radio Project ( GERP ) and as such , to maximize the opportunities to experiment with the board , I think a conversion kit to other radio bands makes the most sense. If a conversion kit was made available, 160 M conversion (for example) . ?Once the conversion kit was received , one could modify the BITX board following some basic instructions to the new band of interest , with the option to convert back if one wanted to do so at a later date . The addition of conversion kits for other bands, should enhance the amount of interest in the BITX40 as a global basic platform for amateur radio enthusiasts to experiment with around the world.? Any additional thoughts on this ? |
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Re: ND6T BiTX40 2nd harmonic solution
Did you mean 100pF not 0.1uF?
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Cheers Alf vk2yac mikedoty via Groups.Io wrote: I was reading the BiTX Hacks blog this morning and saw where Bill Meara had posted some information from Don, ND6T, about the 2nd harmonic at 14.4++ MHz on the BiTX40. I noticed this problem last month on both of the BiTX40 rigs that I've been playing with so I believe the issue to be universal. I wanted to first finish tweaking some of the features that I was incorporating into both an AD9850 DDS VFO and an Si5351 VFO before tackling this issue. I finished those projects to my satisfaction yesterday and came down to the shop this morning to look at the LPF to see if I could adjust it to drop the second harmonic. Before getting started I read the blog and lo and behold - Don already had the solution. I installed a .1uF 100V cap across L7 in both of the BiTX40s and the second harmonic dropped from -28dB to -60dB with no noticeable effect on the output. Many thanks to Don for saving me a lot of effort. --73-- Mike -- W0MNE |
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ND6T BiTX40 2nd harmonic solution
I was reading the BiTX Hacks blog this morning and saw where Bill Meara had posted some information from Don, ND6T, about the 2nd harmonic at 14.4++ MHz on the BiTX40. I noticed this problem last month on both of the BiTX40 rigs that I've been playing with so I believe the issue to be universal. I wanted to first finish tweaking some of the features that I was incorporating into both an AD9850 DDS VFO and an Si5351 VFO before tackling this issue. I finished those projects to my satisfaction yesterday and came down to the shop this morning to look at the LPF to see if I could adjust it to drop the second harmonic. Before getting started I read the blog and lo and behold - Don already had the solution. I installed a .1uF 100V cap across L7 in both of the BiTX40s and the second harmonic dropped from -28dB to -60dB with no noticeable effect on the output. Many thanks to Don for saving me a lot of effort.
--73-- Mike -- W0MNE
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Re: Idea for future versions of BITX
There's always the Teensy LC.? It's specs aren't as impressive (48 MHz,
62K Flash, 8K RAM, 12 bit analog input & output, etc.) but at $11.65 it's very reasonable.? I imagine that it would at least be capable of running a basic modem for digital modes or applying some digital filtering. |
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Re: ending raduino upgrades
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On Jan 14, 2017, at 10:47 AM, "Ashhar Farhan" <farhanbox@...> wrote:
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Re: Radruino with rotary encoder and S-meter
开云体育1.1.2 is what i used. 2.0 has different parameters for some functions
Ron - PA3FAT
Sent from my iPhone
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Re: Groups.io Set Up FAQ
开云体育sarma,
There are two groups that start with "BITX": /g/Bitx and /g/BITX20 The group you posted the question to is the BITX20 group. 73 de Daniel KB3MUN |
Raj vu2zap
JP McGinley