Yeah, I wondered the same thing.
________________________________ From: AF <af-boun...@af.afmug.com> on behalf of Ken Hohhof <khoh...@kwom.com> Sent: Wednesday, December 4, 2024 1:48 PM To: 'AnimalFarm Microwave Users Group' <af@af.afmug.com> Subject: Re: [AFMUG] Optics light budget Pay extra for testing, or do your own testing? The difference may not be manufacturing process but testing. Of if they know they all pass, then just labeling. From: AF <af-boun...@af.afmug.com> On Behalf Of Adam Moffett Sent: Wednesday, December 4, 2024 12:36 PM To: AnimalFarm Microwave Users Group <af@af.afmug.com> Subject: Re: [AFMUG] Optics light budget Yeah, I get that the distance marking is not real, and that's why I was looking at the light budget. Initially, I was looking because I have 20km transceivers on hand and a path that's something like 27km. I was trying to determine if it was even worth trying the 20k's. Apparently yes, it is. ________________________________ From: AF <af-boun...@af.afmug.com<mailto:af-boun...@af.afmug.com>> on behalf of Trey Scarborough <t...@3dsc.co<mailto:t...@3dsc.co>> Sent: Wednesday, December 4, 2024 12:27 PM To: af@af.afmug.com<mailto:af@af.afmug.com> <af@af.afmug.com<mailto:af@af.afmug.com>> Subject: Re: [AFMUG] Optics light budget The 20k 40k 80k definition on these is marketing fluff. you have to look at the actual specifications and calculate it to your network. There is a difference in quality though. The shorter distance lower priced ones you will usually find they will be on the low end of the range. Also the minimum RX level is like the same as a radio. Yeah you can get a link at a -14, but that may not be error free. The minimum is the lowest lite level the sensor can really see. when you get into longer distance optics things like dispersion come in to play too. If your network is good Ive seen 40k optics go 70k and 80k go over 100k. On 12/3/24 3:38 PM, Adam Moffett wrote: et does say guaranteed minimum link budget of 10dB. Even at minimum tx power of +1 to Rx sensitivity of -14.4 that's still over 15dB. The 20km unit supposedly has lower reflectance too. There's some math here beyond my pay grade, or yeah maybe the specs are just wrong. I guess I'll ask the source. -Adam
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