Like I said rabbit ears won't pick up those far away stations. A bowtie can be built with little more than scrap coat hangers, tinfoil & wood (plus a balun)
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Like I said rabbit ears won't pick up those far away stations. A bowtie can be built with little more than scrap coat hangers, tinfoil & wood (plus a balun)
Yagi vs BowTie [Archive] - RochesterHDTV - Western New York High Definition Television. We discuss HDTV, DTV, Home Theater discussion, reviews, deals and more!A four-way bow tie , 7-10 dB gain is recomended for metropolitan areas with strong signal. Eight-way bow tie (similar), 10-13db gain for suburban areas with medium signal. A four way bow tie antenna tends to be multidirectional, pick up signal from the front and back and are a bad choice for multipath. The 8 bay Cm4228 is more directional than the 4 bay cm4221 and works better for multipath.
HSter, your ideas are basically right, you could use multiple versions of any antenna if you could arrange to add all the signals in phase.
This is broadband and really easy to make in a quick and dirty fashion, and almost no-one knows about them. I used to use a large cardboard box (e.g. from a household appliance) and just keep two sides. Using kitchen aluminum foil make the triangles, if you need to join it simply overlap a few inches and use sticky tape. You can adjust the angle between the triangles by opening/closing the cardboard sides. Use a 300ohm to 75 ohm balun to connect your coax to the apex. At 500MHz, making the sides of the triangle 1.2m gives you about 15dB of gain - nothing else to do (except bear the brunt of your family's jokes as you play with your large cardboard box!) I used to be able to knock one up within about 20min of finding that what I wanted to watch was on a distant channel.
HSter - a dipole is a very simple antenna - usually a half wavelength long at the frequency of interest. You could make a simple dipole out of the telescoping portion of rabbit ears though at UHF they'd be relatively short.
If you take a look at the design of a yagi antenna you will see multiple elements - the driven element is about half wavelength and is connected to the antenna. The other elements are a little longer (reflector) or a little shorter (directors) and are spaced based on antenna requirements. You could make the reflector and directors from telescoping elements. The feedpoint impedance is affected by the other elements - the balun helps to deal with that. The challenge with this design is the limitation on bandwidth.
If faced with a similar problem I'd take a close look at the bowtie. The gain, front to back ratio and impedance are different for each design. Ultimately a good choice is one you can construct that does the job.
Unless you are building an established design (e.g. bow tie array etc) I'd skip it until you gain a good understanding of impedance matching, transmission lines and baluns. There are lots of good TV antenna 'recipes' that have been worked out that actually work quite well.How do i do that, pls?
Pls, could you describe the construction details a bit more,
1. Is the entire inside of the horn/only the triangles lined with aluminium foil?
2. must the triangle be made with wires?
3. 450 ohm TV cable?
4. must A-A be as close to each other as possible, so as to get 60 degrees?
5. Broadband?, Does that mean i don't need to design the ant to the desired frequency of 582MHz? making the D= 103.2m ( 40'')?
Thanks!
The horn antenna has 4db less gain than a biquad and would require impedance matching. The biquad will output right to a TV.