Glad we got that resolved :-)
The variants of the Friis equation were developed for different applications. From the communications perspective...
woodturner
Veteran Member
Joined: 06-18-2008
Location: Western Pennsylvania
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Pr / Pt = Ar x At x ( wavelength / 4 x pi x distance ) ^ 2
That may be the source of confusion, you are using a different variant of the Friis equation...Last edited by woodturner; 10-20-2018, 06:32 AM. Reason: added reference to Slik Geek's posted and update to reflect differences, original text is in the smaller fontLeave a comment:
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Given the recent discussion of IoT and wifi meter readers, I found some unrestricted information I can pass along to those who want to learn more....Leave a comment:
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Your experience is fairly common for Heli-coils, one reason they are not considered a "permanent" repair. A solid insert like a Time-Sert works...Leave a comment:
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Slik Geek,
Friis shows that loss decreases with frequency and increases with wavelength, the proportional inverse of frequency.
SImple...Last edited by woodturner; 10-10-2018, 06:34 AM. -
Hedy Lamarr contributed to the invention of Frequency Hopping Spread Spectrum (FH SS). In this technique, the radio is set to one frequency for a period...Leave a comment:
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It's interesting those are still in use, that's mid-1990's technology. Actually did the design on the first 900 MHz DS SS cordless phone in the mid-1990's....Leave a comment:
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I too would rather get a new product when I buy "new". Electronics stores are especially problematic and notorious for this - Walmart, Best...Leave a comment:
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That is what we used to have, worked pretty well but still requires a person to drive by to scan, can only be read within 1000 ft of the meters. That's...Last edited by woodturner; 10-05-2018, 03:40 PM.Leave a comment:
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Around here, they first tried the remote readers that call via a phone line. As cell phone usage increased and people started dropping their home phone...Leave a comment:
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Technically it is illegal in many states to sell a return as "new", but it seems that all stores do it. All of the major discount and department...Leave a comment:
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Probably a return that was not fully checked before being re-shrink wrapped. Unfortunately most stores have shrink wrap machines and repackage retur...Leave a comment:
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