Low-Cost, Simple to Mod Power Splitter!
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- Опубликовано: 24 мар 2024
- I have multiple GPS receivers for various projects that all need separate antennas. I came across this "power splitter" that looked like it would do the job - just needs a little modification. Thanks to Mark VK5QI for the idea!
Power splitter 👉 geni.us/wMSB
GPS Antenna 👉 geni.us/2R8Oi0D
Another antenna👉 geni.us/TqLP
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Power splitter 👉 geni.us/wMSB
GPS Antenna 👉 geni.us/2R8Oi0D
Another antenna👉 geni.us/TqLP
(Affiliate Links)
BG7TBL GPSDO 👉 ruclips.net/video/EgF6-JbGUXA/видео.html
QRP Labs QLG2 👉ruclips.net/video/AIqVDiqDDl0/видео.html
Can you review the new firmware IJV 3 for the UV K5's? It's said to be a complete rebuild of the code.
Just got my power splitter on order. Now over to digikey to order the surface mount capacitors. Nice Job!
I saw Mark's tweet too. I've got two GPS puck antennas sitting in the window at the moment, one for my BG7TBL GPSDO (same as yours) which locks my HPSDR and one for a Blitzortung lightning tracker receiver. It would be better to have one antenna up in the clear with one feed down and then split the signal around.
Hey Michael - here is the one I got from eBay. geni.us/wMSB
Directv SWM splitters work just as well for GPS distribution for a lot less and they don't require any modifications, only a few F-type to SMA or N-type adapters. The first port has DC passthrough and the remainder are DC block. They come in two port, four port and eight port variants. They also come with the 50 ohm terminators and some cool weather boots to keep water out. I've had one for years providing signals for a pair of GPS NTP servers and my 10 mHz GPSDO.
Good idea to prevent having to use a separate bias t and power supply. I would however recommend putting 50 Ohm terminations on the unused ports.
Spare nanoVNA calibration terminators would work. @Ham Radio DX, you have spares, right?
@@LeeMcc_KI5YPR It depends on the output power from the powered GPS antenna that is then split into the output ports of the splitter. You should really measure the output from the splitter. Calibration standards are not really designed to be used as a "dummy load" that is dissipating larger amounts of power. Little SMA calibration standards have very low wattage resistors in them. They may work but they very well may not.
I have 50 ohm SMA pads too
that's pretty slick, I need one for 2m / 70cm
Ape,
2m GPS?
A nifty product and mod. I haven't come across a need for a GPS splitter yet but now I know how to do it if I need to.👍
Nice project, Hayden.
I have to agree, at 51 years old now, back in the day I used to pride myself on great eyesight.
Then SMD arrived, just a bit of advice to anyone in NZ or Australia, I bought one of them head-band magnifiers from Jaycar, sure you look like an idiot wearing it, but hey, no eye-strain, they are so cheap and unless you're rough on things, you only need to buy it once, it's not like you'd wear it to the shops either.
I see they have a new version with LED lights, it is the QM-3511.
Re insertion loss, If you divide a signal into 4 equal portions, each is -6dB down by definition best case, ie all ports matched. -7 sounds reasonable.
Couldn't you just disable the bias T internally in GPS recivers? This way you don't get any extra insertion loss.
I assume the bias T in each one has a cap already in place, so if you just disable the DC feed you can use the already installed cap.
That's a cool litle mod. Looking at the size of the enclosure, could you use a slightly larger capacitor? (For those of us not so skilled with SMD soldering)
Yes I reckon you'd had no issues using a leaded component.
What about a single GPS RX and a 10MHz distribution amp... same outcome, but only need one GPS with 10MHz reference OP? 🤔
You’ll need something different.
I bought a distribution amp from BG7TBL ages ago. But I know you can mod old CCTV distribution amps for that purpose
If you think 0805 are small, I have soldered 0402 onto boards. I let the lab tech do the 0201. We never used 01005; I cannot IMAGINE that small.
And they get even smaller these days. They do make 008004 size now. The smallest I have had to deal with is 0201.
@@mikesradiorepair Wow. How much smaller than a spec of dust can you go? 0201 is 2 grains of fine sand.
@@LeeMcc_KI5YPR It's hard to imagine positioning parts that small on a PCB and soldering them by hand. 0201 is hard enough. With parts that small it's getting to the point where they are not repairable by hand anymore.
@mikesradiorepair Those are used on modules and on substrates for IC's. Machine placed.
Haha I'll stick with 0805 for now Lee - they aren't too bad ;)
milli hZ , WT...
I noticed that too
Put your hand in your pockets and buy a SA
Now you mention it...I have the TinySA Ultra and another RF generator I could actually generate a 1.5 GHz signal and get some kind of thru line reading... now the hard part - find out where I put the generator.