Probably depends on how anal you are, or wish to be. I don't get too
hung up on parsing the speed of light through various normal mediums.
It's even been proven you can stop light altogether in the right medium,
at least temporarily:
(https://www.extremetech.com/extreme/162289-light-stopped-completely-for-a-minute-inside-a-crystal-the-basis-of-quantum-memory).
bp
<part15sbs{at}gmail{dot}com>
On 1/22/2017 9:33 AM, Adam Moffett wrote:
6205ft / 126 = 49ft
I remembered the right multiplier....but apparently I made up the
reason. The multiplier was different for 900mhz. I don't remember
about 2.4ghz.
Correct me if I'm wrong, but doesn't the index of refraction vary with
wavelength? Isn't that why a prism makes a rainbow? If so, then the
speed of 5.8ghz microwave through air would be different than simply
"speed of light". Is it still close enough for these girls you mention?
------ Original Message ------
From: "Chuck McCown" <[email protected] <mailto:[email protected]>>
To: [email protected] <mailto:[email protected]>
Sent: 1/20/2017 11:51:09 PM
Subject: Re: [AFMUG] PTP450 SNMP Miles
OK, round trip would be 6205 x 2 or 12410 nS in a vacuum. But it is
a bit slower in air. Close enough for the girls we go with.
*From:* Steve Utick
*Sent:* Friday, January 20, 2017 9:45 PM
*To:* [email protected]
*Subject:* Re: [AFMUG] PTP450 SNMP Miles
For reference, I checked a PTP450 radio here. It shows An Air Delay
of 126 bits, 12625 ns and 1.175 miles (6205 feet)
On Fri, Jan 20, 2017 at 8:11 PM, Adam Moffett <[email protected]>
wrote:
I don't know if this is still true, but it used to be that air
delay was a count of 10 nanosecond intervals, and if you
multiplied by 49 feet you'd get the actual range.
49 ft/10ns being the speed of the signal through the medium.
------ Original Message ------
From: "Steve Utick" <[email protected]>
To: [email protected]
Sent: 1/20/2017 6:09:23 PM
Subject: Re: [AFMUG] PTP450 SNMP Miles
Air Delay on the PTP450 is at: .1.3.6.1.4.1.161.19.3.1.4.1.24.2
The current round trip air delay in bits measured between the AP
and SM.
On Fri, Jan 20, 2017 at 8:19 AM, Matt
<[email protected]> wrote:
Anyone know how to pull link miles from a PTP450 link master
using SNMP?
