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900Mhz Antenna improvement
Hello. I currently use a WSP255RS RCA 900Mhz transmitter
http://tinyurl.com/a6y5e to send MP3s to a Sony Spiar Receiver. http://tinyurl.com/8ayyg The range of the RCA is 300'. I would like to know if there is an easy way to slightly increase the range of transmission. Is there a 900Mhz antenna amp or kit available to maximize range? Would desoldering the flimpsy antenna and putting a thicker/longer antenna increase range? How about making a better antenna? Something like http://www.shed.com/tutor/mr26ant.html. Any ideas would be appreciated. |
Richard Clark wrote:
On 9 Jun 2005 18:14:14 -0700, wrote: Hello. I currently use a WSP255RS RCA 900Mhz transmitter http://tinyurl.com/a6y5e Hi, Yes, cute. to send MP3s to a Sony Spiar Receiver. http://tinyurl.com/8ayyg Yes, that's cute too. The range of the RCA is 300'. Rather pretty good if you already get this (instead of simply being an advertising claim). I would like to know if there is an easy way to slightly increase the range of transmission. Hmmm, yes. But there are reasons not to. "Slightly" falls slightly outside of good specification. Please state specifically what you need. Is there a 900Mhz antenna amp or kit available to maximize range? Undoubtedly, just like the availability of porn, you can buy almost anything. Is it commercial and could you get it at Circuit City or Radio Shack? - afraid not. It has to do with that law thingy, and the FCC (black market answers most of this). Perhaps something like this little antenna: http://www.ramseyelectronics.com/cgi...ion&key=LPY915 Plenty of "illicit/illegal" stuff is available,ya just gotta know where to look,and of course,many times it also depends on how you use such items. Adding an antenna will probably violate part-15,but I doubt you'll get any "heat" from doing it. Would desoldering the flimpsy antenna and putting a thicker/longer antenna increase range? Depends on antenna design, which could mean thicker/longer wire, but thicker/longer wire is not the answer - it depends on antenna design (probably why you came here). How about making a better antenna? Something like http://www.shed.com/tutor/mr26ant.html. Where the other posts were cute, this is gross. Now, that is not to mean like vulgar - simply too, too big. Look at the antennas in the first two links, and compare to this last one. Even if you made it the right size (and it is in fact the wrong size); then it wouldn't really bring anything to the table. It does answer the agenda of antenna design, but it is not an example of what you describe wanting. A simple solution for "slightly" more range is to build two corner reflectors (google search keywords) at each end. Tin foil on cardboard conception models can answer many questions. Toss in an additional keyword, 900MHz, and you will probably find enough to work with. 73's Richard Clark, KB7QHC |
wrote:
Hello. I currently use a WSP255RS RCA 900MHz transmitter http://tinyurl.com/a6y5e to send MP3s to a Sony Spiar Receiver. http://tinyurl.com/8ayyg The range of the RCA is 300'. Perhaps you mean "the quoted range is 300'". This will an absolute maximum in an open field, /not/ through the walls of a house. I would like to know if there is an easy way to slightly increase the range of transmission. Is there a 900MHz antenna amp or kit available to maximize range? Forget amplifying it. The cheap (and pretty nasty) transmitter circuitry won't provide a /clean/ enough signal for amplification, and 900 MHz electronics isn't trivial - layout is /really/ crucial. Would desoldering the flimsy antenna and putting a thicker/longer antenna increase range? Possibly. Try it and see. How about making a better antenna? Possibly. Do a Google search for a suitable 900 MHz home brew antenna - perhaps a corner reflector type. Something like http://www.shed.com/tutor/mr26ant.html. Definitely not. That's truly hideous, on the wrong frequency, and probably doesn't work at all - he'd be better off with a random length of wire! The "FM balun" he suggests would be seriously lossy at 900 MHz, and the dimensions are wrong. Bob -- Everything gets easier with practice, except getting up in the morning! |
On Thu, 09 Jun 2005 19:34:13 -0700, Ptaylor
wrote: Perhaps something like this little antenna: http://www.ramseyelectronics.com/cgi...ion&key=LPY915 Hi OM, OK, another cute link. However, $30 and postage/handling does nothing to add signal that wasn't already available from the existing design. On the other hand, if you or your folks found comfort, years back, in buying a pet rock, this could be your antenna. 73's Richard Clark, KB7QHC |
Yagi antennas for frequencies this high are ridiculously compact and easy to build! A full wave is only in the 33 CM area, so a "long" Yagi with 6 or 7 elements would look like a yardstick with 5 inch wires bristling from it. If you only need to send signal in a particular direction, this is the way to go-and reduces the chance of unwanted "listeners" in another direction. If you need omnidirectional gain, stacked turnstiles floor to ceiling , looking like a pole lamp brisling with 5" crosses, would do it, yielding maybe 9dB or so of gain by flattening out the pattern. Multiple half waves in phase (vertical with 1/2 wave phaseing sections) will do it with vertical polarization. In stacking anything, you get about 3dB gain for each doubling of the number of elements. ****, hams on 1215 MHZ and 1KW amps are communicating by bouncing signals off the MOON, with antennas yielding 30dB plus gain being reasonable in size due to short UHF wavelengths. |
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