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Differences between the sBitx and the zBitx

John KG9DK All Messages By This Member #115103 Greetings all, beside the power output what are some of the other differences between the sBitx and the zBitx. Thanks John kg9dk
Ashhar Farhan All Messages By This Member #115106 The zbitx ix optimized for small size and lower power. 1. The board layout is RPI Zero 2W specific. It cannot take the larger RPI 4. Nor can it power it as it uses a linear low voltage drop regulator to get to 5V. 2. The circuitry is optimized to work between 6v and 9v. At 12v, the heat from the 5v regulator will be significant. 3. The transmit power chain including the transistors and the filters is kept compact using smaller devices. 4. The front panel has its own processor to handle the 480x320 display and user interactions. 5. The front end uses a diode ring mixer instead of a passive fet mixer. 6. We had to take hard decisions to reach a bill of materials below $100. As a result many good to have things like built-in battery charger, bms, etc. were left out. These are "left as exercise for the reader". 7. The resistors and most capacitors are 0805. Their markings could not be accomodated in many places due to the compactness criterion. This makes it difficult to modify and experiment with the hardware. toggle quoted message Show quoted text On Fri, Jan 10, 2025, 2:41 AM John KG9DK via <jab3739=[email protected]> wrote: Greetings all, beside the power output what are some of the other differences between the sBitx and the zBitx. Thanks John kg9dk
Aaron K5ATG All Messages By This Member #115107 Sounds like it is much better for portable use than the sBITX.? I don't know much about the RPI Zero 2W, can it do screen share like Real VNC like the sBITX? -- '72 Aaron?
Gordon Gibby KX4Z All Messages By This Member #115108 Amazing that the device can be offered AT ALL, particularly at this price.? ?Special purpose design.? ?Compromises have to be made to reach size, cost constraints.? ?If not your cup of tea, then alter yourself to meet YOUR desires, or roll your own!? That's ham radio!? ?It's an experimental hobby, not really an appliance hobby!? ? ??the V2 or V3 is more my style, but the obvious huge interest shows this suits many people! Gordon KX4Z toggle quoted message Show quoted text On Fri, Jan 10, 2025 at 5:43?AM Aaron K5ATG via <Aaron=[email protected]> wrote: Sounds like it is much better for portable use than the sBITX.? I don't know much about the RPI Zero 2W, can it do screen share like Real VNC like the sBITX? -- '72 Aaron?
John KG9DK All Messages By This Member #115113 Thanks for the information, it gives me a better understanding of the two radios.? I am thinking the sBitx would be a better fit for me. I need to do more research on the sBitx, I am concern if Ican master the software and the many features it offers. I have built the earlier Bitx many years ago but things have changed a lot with the addition of microprocessors and programing. Thanks again ?73's John kg9dk
EB3AM Jordi All Messages By This Member #116122 "?The circuitry is optimized to work between 6v and 9v. At 12v, the heat from the 5v regulator will be significant." Is that the only reason not to put the Zbitx at 12v? Can the rest of the machine withstand it? In the schematic (/g/BITX20/topic/zbitx_schematic_and_pcb_xray/110289914) that has been published in this group, the 5v regulation part is not visible, since it says that it is powered at 5v, and there are only 3.3v regulators. So I understand that finally there is a 5v regulator for the entire zbitx, is that so? Or could it be that the power transistors are not affected by the 5v regulation? If that were the case, the regulator would suffer less, and more power could be generated at 12v than at 9v. Well, we will find out with the equipment in hand, and with a definitive schematic. How excited I am to have it at home!
Gordon Gibby KX4Z All Messages By This Member #116123 开云体育 You might want to look into the biasing circuit for every single stage. Because when you change the circuit voltage, the biasing calculations may be different. ? ? Gordon kx4z? toggle quoted message Show quoted text On Mar 5, 2025, at 16:51, eb3am via groups.io <eb3am@...> wrote: ? "?The circuitry is optimized to work between 6v and 9v. At 12v, the heat from the 5v regulator will be significant." Is that the only reason not to put the Zbitx at 12v? Can the rest of the machine withstand it? In the schematic (/g/BITX20/topic/zbitx_schematic_and_pcb_xray/110289914) that has been published in this group, the 5v regulation part is not visible, since it says that it is powered at 5v, and there are only 3.3v regulators. So I understand that finally there is a 5v regulator for the entire zbitx, is that so? Or could it be that the power transistors are not affected by the 5v regulation? If that were the case, the regulator would suffer less, and more power could be generated at 12v than at 9v. Well, we will find out with the equipment in hand, and with a definitive schematic. How excited I am to have it at home!

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