Questions tagged [wifi]

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13
votes
5answers
5k views

How to operate IEEE 802.11 WiFi AP within the amateur radio service?

How can I properly use my ham radio license to operate an IEEE 802.11 WiFi access point within the US amateur radio service, rather than the US "part 15" regulations for unlicensed transmissions?
8
votes
5answers
15k views

How far can a 2.4 GHz, 1 watt signal go in a rural area?

What's the approximate range achievable by a 2.4 GHz signal of 1 watt in semi-urban areas? I can see 2 km from our rooftop. Will a 2.4 GHz signal go that far, i.e. if I send WiFi signals from our ...
8
votes
2answers
1k views

Broadcasting a WiFi SSID long-distance

Which equipment would be good for broadcasting a WiFi SSID the longest possible range? We're making an orienteering race in a forest and would place a sender somewhere high over the trees, ...
6
votes
3answers
2k views

How does Wi-Fi antenna work?

Since I'm working with wireless communications, I decided it would be good to educate myself a little and at least get a basic understanding how does a Wi-Fi antenna work. My first question is about ...
6
votes
5answers
8k views

Wifi passive repeater (antenna to antenna connection)

I have two buildings. Building A has wifi (2.4GHz) infrastructure, Building B doesn't. One side of building B can pick up the wifi signal from building A. I want to passively extend the signal through ...
6
votes
1answer
483 views

Can tropospheric scatter effect be used by 802.11 links?

What are the lowest EIRP and antenna gain requirements that make possible use of troposcatter at the distances of 100 to 150 kilometers assuming conventional WiFi (6 Mbit/s data rate with OFDM/BPSK ...
5
votes
2answers
189 views

Yagi vs Parabolic Dish for 2.4GHz Campus Wifi from 1,800ft away?

My apt balcony is 1,812 feet exactly from my campus's Wifi access point behind a triple pane, brick, 4th floor building window. There is a clear line of sight. I was interested in seeing if I could ...
5
votes
1answer
109 views

Is there a practical way for hams to participate in cellular-related technology advances?

My understanding is that there used to be more timely overlap between commercial and amateur radio technology — e.g. helping study ionospheric propagation, relatively early adoption of SSB technology, ...
5
votes
2answers
175 views

Theoretical Wifi antenna not working for the expected range

You buy a "20dBi omni" Wifi antenna, operating in the 2.4-2.5GHz band. You note that the expected range is not achieved from this 300mm long antenna. What could be wrong? Can someone please tell me ...
4
votes
1answer
588 views

Can a WLAN device be used with GNU Radio?

Can I use my wireless ethernet card with GNU Radio? I have a Broadcom BCM4311 mini PCIe, and Debian / Kali 2.0 Linux.
4
votes
1answer
292 views

What is the average fade margin required for proper operation at 2.4 GHz?

I have two radios. Sensitivity is -84 dBm and transmitting EIRP is +30 dBm. How much distance should I expect? I want it to be somewhere near about 2-3 km. Is it possible?
3
votes
4answers
176 views

My radio in the garage is temporarily shutting down the wifi when I key up

I have a Yaesu FT-101EE, D-104 Mike, MFJ-929 Antenna Tuner, 80-10 OCF Dipole Antenna with a MFJ balun. When ever I key up for more than a few seconds, the wifi network goes down for a couple of ...
3
votes
2answers
85 views

Making WiFi access point range shorter on purpose

Not sure if this is the right place to ask, but I'm trying to build a system of multiple WiFi access points that are spread out across a store. Since every smartphone and WiFi enabled device ...
3
votes
1answer
782 views

maximum distance omnidirectional antenna

I want to know this omnidirectional antenna's maximum distance: gain 15 dBi frequency 2400 GHz power 50 watts
3
votes
3answers
532 views

WIFI Antenna Design

I have designed a dual band WIFI antenna (2.4-2.5GHz and 5.1-5.7GHz). In 2.4GHz it's completely omnidirectional but with negative gain and in 5.6GHz it's somehow directional but with very good ...
3
votes
3answers
3k views

What effect will placing two receiving antennas next to one another be on the received signals

I'm planning on using 2 receivers that operate on the same frequency. So there's no confusion I'm talking about WiFi signals (but I'm trying to do some cool amateur radio stuff with it!) so the ...
2
votes
1answer
625 views

Difference between antennas for Wi-Fi vs. ham repeaters

I understand that Wi-Fi transmits on 2.4 GHz or 5 GHz whereas local ham repeaters transmit around 147 MHz or 450 MHz. What differences would be needed in antennas tuning into either of these ...
2
votes
4answers
458 views

Amateur Radio Long Distance Data Communication

My friends and I are going off to college ~180 miles/290 kilometres apart. As a project, we are looking into creating a data communication connection between our two schools. Our requirements would be:...
2
votes
2answers
107 views

4G extension cable and antenna height?

I have recently bought a 4g Sim Card Router (TP-Link mr6400) and a 4g exterior LTE Antenna. With testing I have now doubled my connection speed. To go one step further, I am looking at the possibility ...
2
votes
1answer
602 views

Measuring energy density of 2.4 GHz and 5.0 GHz signals

I'm a math and computer science student, starting to mess around with using amplifiers and antennas to build long-range wifi hardware in my spare time. Calculating the expected power density of a ...
2
votes
2answers
128 views

Beamwidth of omni-directional antenna with gain

I am looking to buy a wifi antenna for a boat to connect to shore based wireless hotspots that may be "far" away. Due to the waves, I am assuming that the antenna mast sways +-15° from vertical. The ...
2
votes
1answer
199 views

How do I simulate a receiving antenna in EZNEC simulation tool?

I have a situation where I need to find receiving antenna impedance when it’s $\lambda/2$ distance from the transmitting antenna. Both are dipole antennas. Is it possible with EZNEC?
2
votes
1answer
142 views

ISM band bandwidth compared to other bands for theoretical WLAN use, performance?

As a purely theoretical question, what would it be like if wireless computer networking equipment was redesigned and allowed to operate at some other band than the unlicensed ISM band which is ...
1
vote
2answers
244 views

What is the optimal antenna for a high altitude weather balloon?

I was thinking of creating a 2.4 GHz WiFi wireless link with a directional, circular polarized antenna but I am not sure if that would work for such a long distance. The antenna cant weigh more than 1 ...
1
vote
1answer
170 views

Where can I find a very long distance Wifi antenna with a range of 50-100 km? Or is it a DIY project?

I'd like to increase personal security by receiving Wifi connections 50-100 km away from physical device location, with high decibel to milliwatts (dbm) reading to overcome path attenuation by foliage ...
1
vote
3answers
556 views

2.4GHz wifi parabolic antenna frequency response

what happens to the gain of a parabolic antenna, say this, http://www.amazon.com/24dBi-Directional-Booster-Parabolic-Antenna/dp/B00NQGVMSE, for example if I use it in lower or higher frequencies? ...
1
vote
1answer
119 views

Will very close proximity to electrical wires affect radio signals?

I'm planning to use a ESP8266 WiFi module with inbuilt antenna to test a concept. I plan to put it inside a wall mounted switch board/power outlet board. Will the electrical wires seriously affect ...
1
vote
2answers
325 views

2,4GHz Spectrum Analyzer with wireless card

I am new in the world of Radio Technology and I would build an idea with Bluetooth 4.0 and want to see the frequency for debugging. So I will need a Spectrum Analyzer, but won't buy one of these. ...
1
vote
3answers
2k views

Can I build a mini passive repeater to improve my WIFI reception at home?

The problem There's a concrete wall between my computer and my router (Linksys E900) which affects my WIFI reception pretty harshly, computer receives signal is at -65 dBm, at this rate i get around ...
1
vote
1answer
40 views

Can I always see the other module?

I am planning to set up an ESP8266 mesh network. If node A receives beacons from node B, does this mean node B can receive beacons from node A? Assume they are the same (same antenna, ...)
1
vote
1answer
32 views

Find optimal position to place antenna

Given a number of mobile clients, is it possible to find a spot to place a wifi ap to optimize the reception for said clients? I use FSPL equation to calculate the signal from the clients' position: ...
1
vote
1answer
62 views

WIFI PACKETS AMPLITUDE AND DISTORTION [closed]

How is it that a computer receiving packets through wifi doesn't get those wifi packets distorted often? Wouldn't things like other radio waves interfere with the signal often? How does my computers ...
1
vote
1answer
393 views

Best way to make a selfmade Long-Range WiFi Link

What needs to be considered? Which type of antenna(only self-made or reused parts, for example satellite dish) is the best for a long range, high throughput WiFi? How to calculate Antenna size and ...
1
vote
1answer
113 views

Amateur licenced operation and wifi

Is it wise to use my call sign as SSID on 802.11x spectrum. I wish to be known. My question more pointently is, is it common for amateurs to ID on shared common wifi frequencies.
0
votes
1answer
49 views

Understand Radio Pattern of a WIFI antenna

I have a Fortigate AP, and need to understand its radio pattern for optimal positioning. I've already understood the E-plane and H-plane representations and also that number on the circumference of ...
0
votes
2answers
87 views

Acquiring specs on anntenas so as to mathematically model level curves in their transmission feilds

Is there an antenna supplier out there that is particularly well known for publishing enough data on their antennas that one can model their antennas' transmission fields in spherical or cylindrical ...
0
votes
1answer
53 views

Passive antenna system as a Wi-Fi repeater [duplicate]

I want to extend WiFi signal using a passive repeater between two isolated boxes (have to make both box wireless). Transmitter antenna from box A is placed in the gap between box A and B. In the same ...
0
votes
1answer
76 views

Transmit data without line of sight - Legal, fast, cheap and error corrected

I go camping to France every year. There is a wifi station at 200 metres from where I camp, but I don't have a direct line of sight (it's on a slope). I can put a shoebox at the base station, but I ...
0
votes
1answer
64 views

How does wireless communication like wifi connect to different clients? [closed]

Does wireless communications like wifi, where different clients get different data, use different frequencies for each client? Or do they use the same frequency, but with time-divison multiplexing and ...
-4
votes
1answer
74 views

Wifi inside a rocket

I want to understand, as most rocket uses LAN cable and switches to communicate between stages. Is it possible to replace with WiFi? Although it's will be complex system but one idea to make each ...