But he said he gets 30 ERP not 30 EIRP where EIRP = 1.64 * ERP ( if he is actually allowed 30 ERP and not 30 EIRP ). So that would be 49.2 EIRP IF he is allowed 30 _ERP_.. so 49.2. watts would be another 2.15 db.. 9.85 dbm gain antenna. Still no need for an amp...

Please check my math and assumptions, as I _always_ stick my hand up in class and then spit out the wrong answer...


On 07/12/2018 10:30 AM, ch...@wbmfg.com wrote:
Yep, that is how you do it.  30 watts EIRP is 44.7 dBm
5 watts is 37 dBm.  So 44.7 - 37 = 7.7 dB gain.

A 7.7 dBi antenna is pretty common.
After adding antenna gain, I don't see much room to amplify.
-----Original Message----- From: Adam Moffett Sent: Thursday, July 12, 2018 11:06 AM To: af@af.afmug.com Subject: [AFMUG] How to count amplifiers in link budget I'm looking at an IoT application where we're allowed 30W ERP. The transmitter is 5W, so even with antenna gain I have room to amplify that.

How do you count an amplifier in your link budget? Just add the amp's tx gain and subtract connectors, or is there more to it than that?

Strangely I've never used an amplifier.....I've never had a legal application for one before.

-Adam



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