WRt32x Antenna question: Antenna Gain

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weaklinks
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Joined: 06 Oct 2019
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PostPosted: Fri May 15, 2020 0:21    Post subject: Reply with quote
on 2.4 the connection is good but the speed is really bad, i set those on my 5.gz and i would of never thought i am able to get it to be acctable for firestick and facetime before it would never reach my room.
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lavus4578
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Joined: 04 Aug 2020
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PostPosted: Thu Aug 13, 2020 1:00    Post subject: Reply with quote
SurprisedItWorks wrote:
Per Yngve Berg wrote:
Entering a value in antenna gain will only lower the transmitted power.

So there you have it, folks. It's a regulatory thing. Law limits the radiated power, so entering a gain figure matching that of the actual antenna(s) corresponds not to increasing power to clients in the favored directions but to decreasing power to clients in the nonfavored directions. If you instead leave the antenna-gain setting at 0 dBi while using a higher-gain antenna, you'll be doing a little of both, but unless you've set Tx power below the legal limit, you'll be doing it illegally. (Thanks, Per.)



TX 30dBm is illegal unless we set dBi setting corrosponding to physical value? Because if we add any antenna gain EIRP will be over 30 db, be it default or aftermarket high gain ones?

For extra clarification, Can actual antenna directivity vary compared to stock firmware in any case?

Quote:
No, you better leave it as is. If you are thinking will the gain of the antenna be changed after changing this setting. The answer is no. The gain of the antenna is determined by the design of the antenna. You will change this setting only when you replace the antenna with let say a 6dB antenna. Then you will set it to 6.
says js1662.
blkt
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Joined: 20 Jan 2019
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PostPosted: Thu Aug 13, 2020 6:49    Post subject: Reply with quote
The quote answers your questions.
lavus4578
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Joined: 04 Aug 2020
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PostPosted: Thu Aug 13, 2020 20:52    Post subject: Reply with quote
blkt wrote:
The quote answers your questions.


You mean we don't need to change antenna gain setting unless we replace them because the default antenna gain is already considered by DD-WRT and the amount is automatically reduced from TX even if we keep the setting to 0 dBi?
SurprisedItWorks
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Joined: 04 Aug 2018
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Location: Appalachian mountains, USA

PostPosted: Thu Aug 13, 2020 21:00    Post subject: Reply with quote
lavus4578 wrote:
blkt wrote:
The quote answers your questions.


You mean we don't need to change antenna gain setting unless we replace them because the default antenna gain is already considered by DD-WRT and the amount is automatically reduced from TX even if we keep the setting to 0 dBi?

You would think, right? But the whole thing is likely a little looser than that. Consider, for example, the fact that no default antenna is likely going to have 0 dBi gain, but the probability that dd-wrt devlopers are going to have the time, interest, expertise, or equipment to precisely measure the gains of the default antennas of all the routers for which there are dd-wrt builds is known exactly: that probability is zero.

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VLANs, multiple VAPs, NAS, client-mode travel router, OpenVPN client/PBR (AirVPN), wireguard/PBR (AzireVPN), two DNSCrypt servers (incl Quad9) routed through OpenVPN.
blkt
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Joined: 20 Jan 2019
Posts: 1509

PostPosted: Fri Aug 14, 2020 9:28    Post subject: Reply with quote
Gain and directivity are physical properties of the antenna, inherent in design. No firmware, stock or custom, can change this.

WRT32X antennas are rated 4dBi @2.4GHz and 7dBi @5GHz. They are well designed and there is no need to change them.

It is the responsibility of the user to set regulatory domain, channel width, extension channel, wireless channel, TX power and antenna gain accordingly.
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