I was starting to put a presentation together on AREDN for the Maine State ARRL Convention and noticed that IERP listed and this could be a major factor on our planning for Point to Point sites in the 5.8Ghz range.
I don't know if I missed this in the past or did something change around what we as Hams can run for EIRP. Looking at the 5.8 Ghz band some channels are limited to just 1W and others have a max of 200W (all IERP). Using the standard equipment we would be limited to 53dBm EIRP on channels above 145? So most equipment will produce 27dBm and the max antenna gain we could use would be limited to 26dBm. I was looking to use Ubiquiti Rocketdish at 30dBm. Based on what I'm seeing that is not longer legal? In the past we had the upper portion on the 5.8Ghz band and was not restricted. Any thoughts? I'm I reading this right?
Thank you
Frequencies and Channels — AREDN Documentation 3.22.1.0 documentation (arednmesh.readthedocs.io)
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IERP and 5.8Ghz band
Wed, 02/09/2022 - 21:04
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ng1p
IERP and 5.8Ghz band
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Looking at the 5.8 Ghz band some channels are limited to just 1W and others have a max of 200W (all IERP)."
Some months back I did a RF 'site assessment' using a reference at arrl.org.
I recall that there were different rules for publicly accessible .vs. restricted access.
i.e.
I used a formula on my flag pole in the front yard on HF and it is publicly accessible...21 feet from the road.
I used a formula on my RB-LHG-HP5-XL and found that human bodies should not be closer than 28 inches in front of the dish.
Since that device is 10 feet above the roof and roof access is restricted, I counted it as NOT publicly accessible.
In summary, none of my devices require signage to warn the public.
I hope this helps,
Chuck
Thank you
I looked here
https://www.ecfr.gov/current/title-47/chapter-I/subchapter-D/part-97/subpart-D/section-97.313
but found nothing about power limits on the 5 cm band.
Please post the URL of the page that describes the power limits on 5650-5925 MHz or other frequencies of AREDN capable devices.
73,
Chuck
This is the link to the AREDN doc that has the picture . I have also attached a picture of it to this message.
thank you
Sorry. I am not seeing a relationship between that image and what is 'legal' Amateur Radio Service power limits.
73,
Chuck
thank you
It may be helpful to know the EIRP of other users of these shared channels.
I have been using channels 131-145 with great success.
Now knowing that unlicensed is limited to 1 watt EIRP explains much.
73,
Chuck
73 Bill NG1P
Hi, Bill:
Our area has many 5.8 GHz links.
When adding a new link or revisiting a link pair, I do a Wi-Fi Scan at 20 MHz at each end.
Then start with the channel with the weakest signals.
I have tested links pairs across the band and sometimes find that the quietest channel does not have best results. :-|
Locally, we are using these 5 GHz channels:
132, 133, 140, 145, 149, 165, 169, 173, 177, 182, 183, 184 of various bandwidths.
All of those links are directional links.
Some channels are shared as the paired link cannot detect the other paired link. (ch 165 and 177)
3s, Chuck