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Minima Eagle PCB files (slightly OT)
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'Repair & Reuse or Recycle E-Waste' On Dec 29, 2016 11:07 PM, "Richard Knack ihc73scout2@... [BITX20]" <BITX20@...> wrote:
> > ? > > Slightly O.T., but does anyone know where I can find the Eagle PCB files for the "Minima" transceiver (which, to the best of my understanding, is a multi-band Bitx transceiver)?? I would like to try to build one (and etch my own boards). > > Rich > KC8MWG > I can send you a PCB, it's free if U use only for RX, Better go for HF1... > ________________________________ |
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The minima had issues.
There's a bidirectional filter in front of the first mixer with a notch for the IF frequency, that was difficult to get working well enough. ?And the mixer was not ideal. Ashhar was fine with folks experimenting with it, but discouraged them from blindly reproducing it as the result will have spurious emissions.? The Bitx40 has two filters. ?Ashhar is promising mods to get this thing to work on other bands, I suspect that will be just a matter of swapping around those two filters and adjusting the Raduino code for the VFO. ?The minima would need? output filters swapped around. I'm planning to put a bandwsitch on my Bitx40. ?Or plug in filters.? If what you want is continuous coverage throughout the HF spectrum, you might look at Ashhar's double conversion rig, the HF1:? I believe these are the latest schematics: ?? That project was never finalized either, no boards available. Me, I'm not all that concerned with the lack of coverage at 12 MHz of the Bitx40. Jerry, KE7ER ? ---In BITX20@..., <ihc73scout2@...> wrote : Slightly O.T., but does anyone know where I can find the Eagle PCB files for the "Minima" transceiver (which, to the best of my understanding, is a multi-band Bitx transceiver)?? I would like to try to build one (and etch my own boards).? |
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How about building a multiband Bitx? ?All the info you need is right here in the files section. I am currently finishing making my own pcb for the G6LBQ multiband exciter. Ian ?K3HQL On Thursday, December 29, 2016 12:07 PM, "Sandeep Lohia sandeeplohia12@... [BITX20]" wrote:
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'Repair & Reuse or Recycle E-Waste'
On Dec 29, 2016 11:07 PM, "Richard Knack ihc73scout2@... [BITX20]" <BITX20@...> wrote:
> > ? > > Slightly O.T., but does anyone know where I can find the Eagle PCB files for the "Minima" transceiver (which, to the best of my understanding, is a multi-band Bitx transceiver)?? I would like to try to build one (and etch my own boards). > > Rich > KC8MWG > I can send you a PCB, it's free if U use only for RX,
or use seperate BPF for each band ? Better go for HF1...
> ________________________________
> Posted by: Richard Knack <ihc73scout2@...> > ________________________________ > Reply via web post > ? > Reply to sender > ? > Reply to group > ? > Start a New Topic > ? > Messages in this topic (1) > ________________________________ > Have you tried the highest rated email app? > With 4.5 stars in iTunes, the Yahoo Mail app is the highest rated email app on the market. What are you waiting for? Now you can access all your inboxes (Gmail, Outlook, AOL and more) in one place. Never delete an email again with 1000GB of free cloud storage. > ________________________________ > Visit Your Group > New Members 95 > New Photos 2 > ? Privacy ? Unsubscribe ? Terms of Use > > . > > |
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The Mimima was an experimental transceiver, very different from the bitx. It is an excellent receiver but the transmitter faced a fairly strong local oscillator presence in the output. we were unable to resolve it and it remains an unfinished transceiver.? i had stopped circulation of the pcbs as it was not compliant with the spurious emission requirements of the FCC. - f On Thu, Dec 29, 2016 at 11:56 PM, Ian Gerard iank3hql@... [BITX20] <BITX20@...> wrote:
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Okay, I didn't realize that. What about the HF1? Rich KC8MWG On Thursday, December 29, 2016 2:23 PM, "Ashhar Farhan farhanbox@... [BITX20]" wrote:
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Far as I know the HF1 has no known issues.
Not many have been built. I don't know of a PCB available for it. Building one is not just a matter of throwing the parts together and applying power. Getting the crystal filter to work correctly means carefully measuring the crystals first, and adjusting cap values and termination impedances to match your crystals. But you probably know that already. If not, look through the minima mailing list archive.? Me, I plan to adapt my Bitx40 for multiband. That will be much simpler to do. Jerry? |
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How difficult is it to adapt the BitX for multiband use? Haven't quite made heads or tails out of the "files" section, as far as what I need to be looking at. Rich KC8MWG On Thursday, December 29, 2016 11:17 PM, "jgaffke@... [BITX20]" wrote:
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I'm also in the process of adapting my bitx40 for 40/20m. I'm building a 40/20m BPF and looking at shifting the BFO to USB. 73 Ken VA3ABN On Fri, Dec 30, 2016 at 9:10 AM, Richard Knack ihc73scout2@... [BITX20] <BITX20@...> wrote:
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'Repair & Reuse or Recycle E-Waste' On Dec 30, 2016 7:41 PM, "Richard Knack ihc73scout2@... [BITX20]" <BITX20@...> wrote:
> > ? > > How difficult is it to adapt the BitX for multiband use? Haven't quite made heads or tails out of the "files" section, as far as what I need to be looking at. > > Rich > KC8MWG > easy use separate BPF & LPF for each band, > On Thursday, December 29, 2016 11:17 PM, "jgaffke@... [BITX20]" <BITX20@...> wrote: |
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To make this multiband, could have plug in filters at L1,L2,L3 ?and also L6,L7.
Those have to be different for each band. ? Of course, you could use switches or relays instead of plug in filters. The only thing remaining is to adjust the C program on the Raduino to move the VFO to hit the other bands, and to swtich between LSB and USB mode. See post 19713 |
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