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I don't have access to a 3d printer.? I would be willing to reimburse somebody to make me one of these folding supports.? I would like the person to include the screws - a local hardware supplier has them, but $25.00 minimum order for 5 screws!!!!

Thanks

Gerry Sherman

Sent by the Windows 11 Thunderbird

Hi Roy,
Do you have a link that I can look at that you recommend for making one of those? What bands are you able to use it on without a tuner?

73, Scotty

Thanks Bob!? I have been using any number of things to tilt my sBitx and should have thought of this.? I fired up a 3D printer after lunch and voila!? Fits like a glove and just what I needed.

73, Mike
KD4MM

Hi Evan,

I really do appreciate the advice and reasons that you have stated. Since I really like rtty/bpsk style modes as well as cw, I will most likely go for the sbitx model. Also, if modification is needed to bring the ubitx up to what I want, then I am best to start out with the sbitx. I do enjoy ssb from time to time too though. When on a limited radio equipment budget, planning is needed. Not sure of the portable antenna yet, but it will most likely be no larger than a 20 meter inverted vee so that it will fit in a camp site with our pull behind camper at state parks. I might try making it multiband with a tuner and twin lead cable.
Many thanks, 73

Scotty

Hi Scotty,

I own six uBitx and two sbitx.? The uBitx, as delivered, can do SSB, and with a PC and sound card, it can do digital modes.? It is marginal for CW as it does not have a narrow audio filter.? The significant advantage is the lower cost.? It also has a lower learning curve to modify the software that controls the radio.? It is a mature design, as few new mods have been posted recently.? Older mods are becoming unavailable.

The sbitx is good at CW, SSB, and can do digital modes with the internal Raspberry Pi.? It has a steeper software learning curve as it is a software-defined radio.? It is early in the maturity cycle, as updates are almost monthly and are free.? It will get even better and should cost nothing for the improvements.

The actual cost difference will depend on how you want to use it.? As a portable SSB rig, the uBitx wins on cost.? As a digital rig, the sbitx wins.? I recommend the sbitx, as the functionality improvements are just starting, and most are free software based features.? You will be purchasing or building hardware to add functions to the uBitx.? I am in the process of adding functionality to a uBitx to make it CW-worthy, as well as adding AGC, S-Meter, and taming the power curve vs frequency.? The parts cost $100 unless you have an extensive parts/junk bin.

I recommend the sbitx.

My opinion, others may differ, and YMMV
73
Evan
AC9TU

Mark
? Yes, those are the dimensions I used for the back of the tilt mount. They are explicitly declared in the OpenSCAD source file.
? As mentioned, I also checked the others in the drawing by printing a thin template and laying it on the back of the sBITX to check hole alignment.
--
73
??? Bob? KD8CGH

FWIW I have kept track of storage performance I measure using linux's 'hdparam' which is a read-only test.?
I have a little piece of shell code that does 10 runs and reports the min/max/avg read throughput.
Below is the summary of the data, updated last night after testing the Pi 5 PCIe NVMe setup.



As usual, your mileage may vary, but I gotta say, the Pi 5 with Gen3 PCIe feels wikked fast!

Personally, I hope future Pi devices provide more than one lane of PCIe to external devices.

We see the 'workstation' got almost 3x better performance, and I bet it's due to more PCIe lanes.

--
Regards,
Dave, N1AI

On Tue, Jan 23, 2024 at 12:58 PM, WB6GJE Mike wrote:

Get a consensus of advice and go with information that appears consistently across a number of YouTube videos and/or blog posts.

Wow, that's a perfect lead-in for me.? I wrote most of the below for another platform, but IMO it fits into this discussion here about Pi 5 and NVMe.? It also fits into some stuff I wrote earlier about how I feel Pi will be under more pressure from small form-factor (SFF) PCs using x86 processors, and that the sBITX community will have to be ready for things to change more rapidly than in the past

IMO design decisions made by the Pi Foundation make it relatively easy for them to move on to Pi 6 and beyond because they've put all the IO onto a separate chip.? That makes it easier for them to drop a newer/faster CPU into their design than they have in the past, and such newer/faster ARM CPUs already exist.? ? They may have to, because SFF PCs IMO are already strong competitors so there is already a competitive threat that could easily intensify.? I'm saying this since I think a lot of people have gotten used to the slower development pace of the COVID era, but I think those days are long over.??

So, we see that Jeff Geerling is jumping onto the Pi 5 vs N100 SFF PC bandwagon after Christopher Barnatt / Explaining Computers did so a week or so ago.??

Jeff:??

Chris:??

Jeff is doing an almost exact match on price and is fairly close on form factor, whereas Chris's N100 PC was not a SFF PC, it was a mini-ITX so bigger case and PSU and cost 1.5 times more than his Pi 5 setup.? ?Yet Chris's N100 has very similar specifications to Jeff's.? Chris provides more details on specifications and performance than Jeff did.? For instance Chris tells us his motherboard supports two-lane PCIe V3, whereas Jeff doesn't get into that level of detail.

Jeff's video is really amusing to me since my PCIe to NVMe adapter arrived last night for my Pi 5 and I was doing almost all the same stuff he was doing in the setup phase of this video myself last night.? My Pi 5 setup is pretty much identical to Chris's.? We both have the Pineberry Pi Hat! Bottom whereas Jeff has the Top model.??

Jeff is right that the Pi world requires you to select, purchase and assemble more 'stuff' to get a useful setup whereas most SFF PCs come with all the stuff you need right out of the box.? ?He is also right that it's really hard to know if a given Pi case will work with a given top/bottom device and still provide good air flow, still have the holes line up with the jacks, still be able to get at the sdcard, power button, camera/display connectors, etc.

My summary of both videos is that at a similar price point the N100 platforms delivers somewhat faster performance but draws somewhat more power both at idle and under load to deliver that performance.? The N100 is clearly faster at anything that involves graphics and video since it has a better GPU with better software support.? The N100 takes up more space, but is more expandable.? Jeff's N100 has room for a 2nd NVMe storage device and has a slot for mobile data dongles too.? He doesn't say if the memory is expandable or not.? Also, I don't know how 'battery friendly' its voltage requirements are.

On the software side assuming you are using the "native" software for the box, Debian Linux on the Pi boots up pretty much ready to use whereas Windows makes you accept a EULA, accept or avoid a Microsoft account, turn off a whole bunch of data collectors, only provides the Edge browser by default etc so is worse from a privacy point of view.? Windows is also a bigger target for malware providers although one shouldn't presume Linux isn't also targeted quite often too.? And, of course, you can always install Debian on the N100 PCs and bypass Windows entirely.? Regardless of what thinks of Windows, though, being able to offer it is a competitive advantage, IMO.

--
Regards,
Dave, N1AI

Thanks for all the answers!

: )

73,
Rafael

Hi Hank,

Can you be a bit more specific? There is no i2s-nmap, but i2s-mmap.

- Rafael

Thank you for the reply. I have been doing some research into these radios for a possible purchase. I am leaning toward the sbitx at the present.? As a past Radio Shack repair tech, I am very familiar with service of electronics. If I do purchase one of these, I am hoping repair will never be needed. But the fact that the schematics are available and a very straightforward design make them very appealing, compared to many other radios I have found. They seem to be very easily modifiable for any new things I might wish to add. My biggest challenge will be to learn the coding to modify software to implement any modifications! If I get one, I will want to make a battery pack and perhaps an antenna tuner for camping or even while sitting in the front yard supervising grandchildren. It seems a better choice than playing games on a cell phone.

Scotty

Topographically they are very similar.?
Its small design differences.

Things like lower output load resistance output transformer turns ratio,
construction,?and increased Drive to meet the need.

Heat sinking is also critical, as are things like lead lengths and mechanical layout
are also factors.

I've seen uBitx deliver over 15W when the drivers were up to the task.

--
Allison
------------------
Please use the forum, offline and private will go to bit bucket.

Bob,

I think I got it. Imported your backbrace stl into tinkercad and used the grid there to get it to the mm.

Left to right is 196mm and the "middle" hole is 42mm from left.??

Let me know if you come up with something else.

73
Mark
--
AJ6CU/7
KD8CEC 2.0, Nextion Screens,? and open source uBITX Raduino boards for Arduino IOT, BLE, RP2040, Teensy 4.0, and Raspberry Pi Pico
https://github.com/aj6cu

Mark

?I meant the rounded part to face in and the flat back to contact the leg angle stop. Thanks for the catch. I'll improve the directions.

Attached is a drawing of hole locations. I know what you mean about iterative measurement. I made a quick, 1 mm thick plate with holes to check these.


--
73
??? Bob? KD8CGH

I have been looking at the schematics of the ubitx and sbitx units.
Both appear to use the IRF510, at least in the diagrams that I found. The sbitx is advertised as 20 watts and the ubitx is advertised as 10 watts. Are they using different versions of the same unit, or just a better design and heat sink?

What am I missing??

Scotty

On Mon, Jan 22, 2024 at 11:50 AM, Dave, N1AI wrote:

On Mon, Jan 22, 2024 at 02:30 PM, WB6GJE Mike wrote:

FYI, Jeff Geerling covers the use of USB and PCIe booting for Raspberry Pis in great detail on his blog ( ; for example - ) and on YouTube ( ).

I definitely love Jeff's work and watch every video as they come out.? The only caution I would raise is that he tends to be working on the bleeding edge with Pi, so some of his older articles don't age too well, because once the stuff he is working with becomes mainstreamed usually easier ways to do things have been invented or discovered.? This is not the case for PCIe right now, it is still "bleeding edge" and his stuff is still the best reference IMO.? For USB I posted the Tom's Hardware link because I think it's easier for most people to follow.? In particular Imager can be used to do some things Jeff did manually.

-- Regards, Dave, N1AI

I agree with Dave - should have noted that Jeff Geerling is an early adopter and he typically does not update his posts with information as features go mainstream. For example, I was following his guidance on setting up an NVMe drive using one of the PCIe adapters for the Raspberry Pi 5. Turns out it was missing one config change necessary to make it work with the production version of the board (but worked with the proto board he reviewed). That said, don't be afraid to use the Google or DuckDuckGo for any of the Pi-related questions posed in this forum. Get a consensus of advice and go with information that appears consistently across a number of YouTube videos and/or blog posts.

Bob,

That would be good if you have a chance.? Trying to place the holes once. I never seem to measure them exactly and find myself always printing, move a mm, print again, move a mm, repeat...

Just printed it, nice design!? I assume the rounded part of the legs face outside (away from the sBitx) ?

73
Mark
--
AJ6CU/7
KD8CEC 2.0, Nextion Screens,? and open source uBITX Raduino boards for Arduino IOT, BLE, RP2040, Teensy 4.0, and Raspberry Pi Pico
https://github.com/aj6cu

Sorry, I should have added the stock screen is the "official" Pi screen: