Author Archives: John Hagensieker

Laser Engraver Side Hustle Discussion

I’ve spent a lot more time on Laser Engraver forums lately and picked a few flowers out of those fields. I’ll do my best to keep this brief and fun.

Poison Gas

Go to any laser forum and there is always one mama bear who will gasp with disbelief when some people post photos of the items they laser. She (it is usually a she) will then post something like this:

“OMG, don’t you know that item releases Hydrochloric gas which will kill you and corrode your machine?”
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LaserPecker 4 vs xTool F1

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LaserPecker 4 vs xTool F1

LaserPecker 4

I recently got my hands on a LaserPecker 4 (LP4) and am giving it the old one, two. Conversely, I already own an xTool F1 and thought it would be fun to do a head to head shootout with them.

Both have similar specifications. And both contain a 2 watt 1064 nm IR laser, and a 450 nm blue diode 10 watt laser. The working area is roughly similar on both lasers. Additionally, both have an extension conveyor and both can be used with a rotary device.

So you’d think that it would difficult to declare one to be better than other? Trust me. It wasn’t difficult to determine which one was better.

But we’ll get to that.
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Best DMR Radio For 2024

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Best DMR Radio For 2024

Digital Mobile Radio, aka DMR Radios are expensive. If you are a Ham radio operator you can get a hand held radio that is decent for less than $50. Not so much in the world of digital hand held radios. The radio that seems to be ordained for the top slot costs around $329. John’s Tech Blog has ordained that the best DMR radio for 2024 is the Retevis RT3S which costs about $86 for a non-GPS version, and about $90 for the GPS version.
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John’s Tech Blog Downtime May 4

ACMER M2 Rotary Review

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ACMER provided me their M2 Rotary Roller ($89) to review. I am no stranger to laser rotary devices and own at least 7 at the moment.

Many of these rotary devices are similar, however, there are elements that make some better than others.

The first thing I want to say about the ACMER M2 Rotary Roller is that it COMES ASSEMBLED.

There is nothing quite as enjoyable as taking parts, belts, motors and gears out of a box that contains no instructions and trying to put it together. That simply isn’t the case here.

And it will engrave items from 4mm to 138mm in diameter. Within that range are 4 width adjustments of 20/40/60/80 mm.
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TIDRadio TD-H3 Review

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TIDRadio TD-H3 Review

TIDRadio TD-H3

Seems like there is no shortage of new Amateur Band and GMRS radios out there for sale. Today we’ll take a look at the TIDRadio TD-H3. TIDRadio has been around since 2013, however, this is the first one of their radios I have owned. They are available on Amazon for about $32. When you see what this radio can do you will recognize that $32 is a STEAL.

This radio follows a trend that I, and many others have noticed. The consumer wants a radio that can do it all despite any FCC rules or regulations stating otherwise. The buying public seems to want radios that can be unlocked to do much more than they are certified to do.

And that is pretty much what we have here with the TIDRadio TD-H3. It should be noted that if you buy the Amateur TD-H3 (HAM) it doesn’t break any rules. When you buy the TD-H3 (GMRS) version it is also set up for GMRS rules and regs.

It is when the owner unlocks the radio is where the fun begins. Again, it seems like this is what radio customers want these days.
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ACMER P1 10 Watt Laser Review

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ACMER P1 10 Watt Laser Review

My new friends at ACMER recently sent me their P1 S Pro to review and they promptly followed that up by sending me an ACMER P1 10 watt laser engraver, an M2 Rotary Roller, and an R10 Enclosure.

I’ll just be featuring the ACMER P110 watt laser in this blog though and will cover the other items in a subsequent entry.

The P1 laser checks in at $339 on their website with the 10 watt laser head.
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SharkRF OpenSpot 4 Pro Review

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SharkRF OpenSpot 4 Pro Review

SharkRF Openspot 4 Pro

I bought a SharkRF Openspot 1 in around 2018. So I have been a long time user of SharkRF gear. I absolutely, positively did NOT need another DMR hotspot but I sprung for the SharkRF Openspot 4 Pro anyway.

Boy I sure am I glad that I did.

I am no hotspot rookie and currently have 4 Raspberry Pi with various MMDVM boards in rotation here at Casa John’s Tech Blog. I run Pi-Star and WPSD OS’s. And have toyed with various other OS’s over the years.

There are strengths and weaknesses in all these DMR hotspots. One weakness in the Pi-Star world is that it needs to be shut down elegantly. When you have a hotspot plugged in a USB port in your truck which uses your cell phone for internet it is kind of hard (and very inconvenient) to find the IP address, open a web page on your phone and shut it down. Sooner rather than later you are going to corrupt the SD card on the Raspberry Pi if you just kill the power. In fact I have done this a few times.

The SharkRF Openspot 4 Pro caught my eye because it is battery powered.

And that is all I really wanted for my mobile hotspot. Something I wouldn’t kill from uncommanded shut downs.

What I got was so much more than I expected. Read on.
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Best DMR Hotspot

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Best DMR Hotspot

DMR Hotspot

So you have decided to take the leap into Digital Mobile Radio (DMR). DMR uses the internet as the backbone for carrying communications. Adding an MMDVM board to a Raspberry Pi is one common way to create a hotspot.

To get to that backbone you need to enter the internet either through a DMR Repeater or through a DMR Hotspot.

A hotspot is just a gateway to the internet and your radio talks to the hotspot and then your transmission is carried through the net to someone else’s repeater or hotspot.

I’d be remiss in not pointing out that so far no radio companies have really jumped in this market. You would think that the big dog radio manufacturers that sell DMR radios would also produce DMR Hotspots, but they really don’t.

It is mostly amateur operators who design and produce MMDVM boards and sell them to the public. You then roll your own. There are a couple of exceptions here as Bridgecom Systems sells pre-configured DMR Hotspots. Also, a company called Shark RF sells a hotspot called OpenSpot. Both are kind of pricey.
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Unlocked Ham Radios

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Unlocked Ham Radios

The FCC started getting serious about the importation of unlocked ham radios sometime around 2019 or so. An unlocked radio is one that transmits on frequencies not intended for the type of radio that it is. For example, a GMRS radio should not be able to transmit on amateur radio frequencies and vice versa. Some folks also refer to this as jailbreaking although that term is more synonymous with cellular phones or game consoles.

The rules regarding the importation and sale of such radios in the US is pretty clear, especially regarding any Family Radio Services such as FRS, GMRS, and MURS.
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