Difference between antennas for Wi-Fi vs. ham repeatersEffect of different metals for antenna elementsSmallest HF antenna for DX?Bandwidth, Q-factor, Radiation Eff calculationsAcquiring specs on anntenas so as to mathematically model level curves in their transmission feildsWhat is the point of high gain antenna with respect to the maximum EIRPWhat kind of 2 meter antenna is this?75Ω Wire FM antennaWhich antenna would you use?How to determine the minimum distance between ham and TV antennasShare wide band antenna with multiple transceivers
You see a boat filled with people
What kind of mathematical disciplines would be most useful for physics?
How do we kill what we can't see?
How to determine if the current Ubuntu installation is minimal?
Is this really played by 2200+ players?
Why didn't Petunia know that Harry wasn't supposed to use magic out of school?
What (if any) replacement parts have been 3D printed on the ISS and then installed?
Had J. K. Rowling seen This Is Spinal Tap before writing Harry Potter and the Philosopher's Stone?
Why is a 737 Original speed-restricted below 10,000 ft with inoperative windscreen heating?
Deadlock Graph - Surviving Statement inputbuf does not show the object that was locked
Masyu keep making those 3D puzzles?
Samples of old guidance software
should I include offer letter from a different institution in my application for a faculty position
How to denote an aside in org?
How to distinguish between different instruments in a classical orchestra?
paying debt collector's invalid rent claim, then suing landlord for money back
How do I get softer pictures in sunlight, like in this commercial?
Is it okay if I am slow in reading math?
Best way to drill square tubing (Without drill press)
Would dimension door trigger or bypass mental prison?
Why do the Romance languages use definite articles, when Latin doesn't?
Length-terminated sequences
Adding more space to a plot
Is there a general theory of "compactification"?
Difference between antennas for Wi-Fi vs. ham repeaters
Effect of different metals for antenna elementsSmallest HF antenna for DX?Bandwidth, Q-factor, Radiation Eff calculationsAcquiring specs on anntenas so as to mathematically model level curves in their transmission feildsWhat is the point of high gain antenna with respect to the maximum EIRPWhat kind of 2 meter antenna is this?75Ω Wire FM antennaWhich antenna would you use?How to determine the minimum distance between ham and TV antennasShare wide band antenna with multiple transceivers
.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty
margin-bottom:0;
.everyonelovesstackoverflowposition:absolute;height:1px;width:1px;opacity:0;top:0;left:0;pointer-events:none;
$begingroup$
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 frequencies, to account for the difference in frequencies, either Wi-Fi or the ham repeaters?
For example, let's say I'm getting or building a Yagi antenna to pick up a distant Wi-Fi signal better, and I also want a Yagi antenna to better listen to (even better if also transmit) a distant ham repeater station. Could I use the same Yagi antenna for both purposes, or if not, how should the two Yagi antennas differ to best work with the different purposes?
In that example, let's say for Wi-Fi I'd plug the antenna into a USB wireless adaptor in a PC, whereas for the ham repeaters I'd plug the antenna into a transceiver, e.g. a simple Baofeng HT.
antenna wifi range repeater-coverage
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
$endgroup$
add a comment
|
$begingroup$
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 frequencies, to account for the difference in frequencies, either Wi-Fi or the ham repeaters?
For example, let's say I'm getting or building a Yagi antenna to pick up a distant Wi-Fi signal better, and I also want a Yagi antenna to better listen to (even better if also transmit) a distant ham repeater station. Could I use the same Yagi antenna for both purposes, or if not, how should the two Yagi antennas differ to best work with the different purposes?
In that example, let's say for Wi-Fi I'd plug the antenna into a USB wireless adaptor in a PC, whereas for the ham repeaters I'd plug the antenna into a transceiver, e.g. a simple Baofeng HT.
antenna wifi range repeater-coverage
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
$endgroup$
add a comment
|
$begingroup$
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 frequencies, to account for the difference in frequencies, either Wi-Fi or the ham repeaters?
For example, let's say I'm getting or building a Yagi antenna to pick up a distant Wi-Fi signal better, and I also want a Yagi antenna to better listen to (even better if also transmit) a distant ham repeater station. Could I use the same Yagi antenna for both purposes, or if not, how should the two Yagi antennas differ to best work with the different purposes?
In that example, let's say for Wi-Fi I'd plug the antenna into a USB wireless adaptor in a PC, whereas for the ham repeaters I'd plug the antenna into a transceiver, e.g. a simple Baofeng HT.
antenna wifi range repeater-coverage
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
$endgroup$
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 frequencies, to account for the difference in frequencies, either Wi-Fi or the ham repeaters?
For example, let's say I'm getting or building a Yagi antenna to pick up a distant Wi-Fi signal better, and I also want a Yagi antenna to better listen to (even better if also transmit) a distant ham repeater station. Could I use the same Yagi antenna for both purposes, or if not, how should the two Yagi antennas differ to best work with the different purposes?
In that example, let's say for Wi-Fi I'd plug the antenna into a USB wireless adaptor in a PC, whereas for the ham repeaters I'd plug the antenna into a transceiver, e.g. a simple Baofeng HT.
antenna wifi range repeater-coverage
antenna wifi range repeater-coverage
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
edited May 29 at 16:15
Peter Mortensen
1214 bronze badges
1214 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
asked May 28 at 21:54
cr0cr0
1114 bronze badges
1114 bronze badges
add a comment
|
add a comment
|
1 Answer
1
active
oldest
votes
$begingroup$
In order to use the same antenna design at different frequencies, "all you need to do" is scale all elements of the antenna proportionally to the difference in wavelength. For example, if you take a Yagi antenna designed for around 150 MHz, and scale all of the lengths in its design down by half, you will have a Yagi antenna good for 300 MHz.
Of course, there's no “resize” button on physical objects, so you have to build two separate antennas instead. And there may be mechanical limitations (e.g. the thickness of sufficiently strong wires) that mean a design doesn't physically scale perfectly.
If you use an antenna at a frequency/wavelength that is too far off from what it was designed for, two things will happen:
It will have a different impedance at the feed point (the connection to the transmitter). This means that the RF energy will not be efficiently transferred into/out of the antenna, and it may damage a transmitter. (For receivers, this is not usually critical.)
The radiation pattern will be not as designed. Generally, a directional antenna will not be as directional — instead of "pointing" in one direction, it will have a spiky pattern with many highs and lows.
It is not impossible to have a directional antenna which works for two different frequency bands. But it must be designed specifically for that pair. And unless physical space is an issue (as with HF antennas which work with long wavelengths and therefore are themselves quite large), it is simpler to use two separate antennas with standard designs, if a suitable multi-band design is not already available.
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
$endgroup$
add a comment
|
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("schematics", function ()
StackExchange.schematics.init();
);
, "cicuitlab");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "520"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/4.0/"u003ecc by-sa 4.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fham.stackexchange.com%2fquestions%2f14610%2fdifference-between-antennas-for-wi-fi-vs-ham-repeaters%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
In order to use the same antenna design at different frequencies, "all you need to do" is scale all elements of the antenna proportionally to the difference in wavelength. For example, if you take a Yagi antenna designed for around 150 MHz, and scale all of the lengths in its design down by half, you will have a Yagi antenna good for 300 MHz.
Of course, there's no “resize” button on physical objects, so you have to build two separate antennas instead. And there may be mechanical limitations (e.g. the thickness of sufficiently strong wires) that mean a design doesn't physically scale perfectly.
If you use an antenna at a frequency/wavelength that is too far off from what it was designed for, two things will happen:
It will have a different impedance at the feed point (the connection to the transmitter). This means that the RF energy will not be efficiently transferred into/out of the antenna, and it may damage a transmitter. (For receivers, this is not usually critical.)
The radiation pattern will be not as designed. Generally, a directional antenna will not be as directional — instead of "pointing" in one direction, it will have a spiky pattern with many highs and lows.
It is not impossible to have a directional antenna which works for two different frequency bands. But it must be designed specifically for that pair. And unless physical space is an issue (as with HF antennas which work with long wavelengths and therefore are themselves quite large), it is simpler to use two separate antennas with standard designs, if a suitable multi-band design is not already available.
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
$endgroup$
add a comment
|
$begingroup$
In order to use the same antenna design at different frequencies, "all you need to do" is scale all elements of the antenna proportionally to the difference in wavelength. For example, if you take a Yagi antenna designed for around 150 MHz, and scale all of the lengths in its design down by half, you will have a Yagi antenna good for 300 MHz.
Of course, there's no “resize” button on physical objects, so you have to build two separate antennas instead. And there may be mechanical limitations (e.g. the thickness of sufficiently strong wires) that mean a design doesn't physically scale perfectly.
If you use an antenna at a frequency/wavelength that is too far off from what it was designed for, two things will happen:
It will have a different impedance at the feed point (the connection to the transmitter). This means that the RF energy will not be efficiently transferred into/out of the antenna, and it may damage a transmitter. (For receivers, this is not usually critical.)
The radiation pattern will be not as designed. Generally, a directional antenna will not be as directional — instead of "pointing" in one direction, it will have a spiky pattern with many highs and lows.
It is not impossible to have a directional antenna which works for two different frequency bands. But it must be designed specifically for that pair. And unless physical space is an issue (as with HF antennas which work with long wavelengths and therefore are themselves quite large), it is simpler to use two separate antennas with standard designs, if a suitable multi-band design is not already available.
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
$endgroup$
add a comment
|
$begingroup$
In order to use the same antenna design at different frequencies, "all you need to do" is scale all elements of the antenna proportionally to the difference in wavelength. For example, if you take a Yagi antenna designed for around 150 MHz, and scale all of the lengths in its design down by half, you will have a Yagi antenna good for 300 MHz.
Of course, there's no “resize” button on physical objects, so you have to build two separate antennas instead. And there may be mechanical limitations (e.g. the thickness of sufficiently strong wires) that mean a design doesn't physically scale perfectly.
If you use an antenna at a frequency/wavelength that is too far off from what it was designed for, two things will happen:
It will have a different impedance at the feed point (the connection to the transmitter). This means that the RF energy will not be efficiently transferred into/out of the antenna, and it may damage a transmitter. (For receivers, this is not usually critical.)
The radiation pattern will be not as designed. Generally, a directional antenna will not be as directional — instead of "pointing" in one direction, it will have a spiky pattern with many highs and lows.
It is not impossible to have a directional antenna which works for two different frequency bands. But it must be designed specifically for that pair. And unless physical space is an issue (as with HF antennas which work with long wavelengths and therefore are themselves quite large), it is simpler to use two separate antennas with standard designs, if a suitable multi-band design is not already available.
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
$endgroup$
In order to use the same antenna design at different frequencies, "all you need to do" is scale all elements of the antenna proportionally to the difference in wavelength. For example, if you take a Yagi antenna designed for around 150 MHz, and scale all of the lengths in its design down by half, you will have a Yagi antenna good for 300 MHz.
Of course, there's no “resize” button on physical objects, so you have to build two separate antennas instead. And there may be mechanical limitations (e.g. the thickness of sufficiently strong wires) that mean a design doesn't physically scale perfectly.
If you use an antenna at a frequency/wavelength that is too far off from what it was designed for, two things will happen:
It will have a different impedance at the feed point (the connection to the transmitter). This means that the RF energy will not be efficiently transferred into/out of the antenna, and it may damage a transmitter. (For receivers, this is not usually critical.)
The radiation pattern will be not as designed. Generally, a directional antenna will not be as directional — instead of "pointing" in one direction, it will have a spiky pattern with many highs and lows.
It is not impossible to have a directional antenna which works for two different frequency bands. But it must be designed specifically for that pair. And unless physical space is an issue (as with HF antennas which work with long wavelengths and therefore are themselves quite large), it is simpler to use two separate antennas with standard designs, if a suitable multi-band design is not already available.
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
answered May 28 at 22:02
Kevin Reid AG6YO♦Kevin Reid AG6YO
18.6k4 gold badges36 silver badges82 bronze badges
18.6k4 gold badges36 silver badges82 bronze badges
add a comment
|
add a comment
|
Thanks for contributing an answer to Amateur Radio Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fham.stackexchange.com%2fquestions%2f14610%2fdifference-between-antennas-for-wi-fi-vs-ham-repeaters%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
