| Electronics > RF, Microwave, Ham Radio |
| Suggestions for low cost, high gain 433MHz omni directional antenna |
| (1/2) > >> |
| splin:
By low cost I mean preferably < $10 and for 'high gain I mean better than 3 dBi. 5 or 6dBi+ would be good, 8dBi even better but unlikely at this price I guess. As this is only for experimenting, I don't want to spend $50+ on a colinear at this stage. These are cheap and claimed to be 6dBi but I'd be surprised if it is actually more than 3dBi: http://www.ebay.com/itm/1x-433MHZ-High-Gain-Antenna-SMA-Within-Needle-Rubber-Glue-Stick-6DBI-IUK-/151821134498?hash=item23593eaaa2:g:F~kAAOSwQoFWQr40 Then there's this: http://www.ebay.com/itm/433MHZ-10DB-SMA-High-Gain-Antenna-Sucker-Head-Copper-Signal-99-Good-/181634223889?hash=item2a4a3e4f11:g:IqYAAOSwAL9Ui6TX I guess the term Sucker in the title refers to anyone who believes the 10dBi claim! Like Chinese battery millamp-hours and LED torch lumens, I expect Chinese dBi to be somewhat bigger than western ones! >:D It's also over $16 although it does include 3m of feeder. Any guesses as to the real performance of the above? |
| dmills:
Does not an omni directional antenna have at most 0dBi gain by definition..... If you only want omni in one plane then that is of course a slightly different thing, a colinear is not hard to homebrew at those wavelengths (But quickly gets more then a little large). Regards, Dan. |
| HAL-42b:
Discone and Bi-cone antennas are all the rage these days. Of course you will have to make your own. |
| Howardlong:
--- Quote from: dmills on January 20, 2016, 10:36:13 pm ---Does not an omni directional antenna have at most 0dBi gain by definition..... --- End quote --- No, that's an isotropic, which also happens also to be omni. Omni directional in antenna terms refers to a single plane. A dipole or 1/4 wave are omnis. A dipole has a couple of dB gain over an isotropic. |
| nfmax:
--- Quote from: HAL-42b on January 21, 2016, 07:47:31 am ---Discone and Bi-cone antennas are all the rage these days. ... Of course you will have to make your own. --- End quote --- It may not qualify as low (enough) cost, but there is this one: http://www.conrad.com/ce/en/product/190073/Aurel-650200313-433MHz-Radio-Kit. I've not tried it myself, but it is recommended here http://www.domoticaforum.eu/viewtopic.php?f=27&t=9630&p=76422&hilit=antenna#p76422 by a guy who is a desinger & manufacturer of 433 MHz radio devices (which I have used myself, happily) |
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