Looks kind of like some of the UHF designs I've seen in Europe. A lot more elements in the reflector and perhaps a bit more of a curve to the reflector. The bow elements look similar to the bow elements used on the Channelmaster 4248.
Over in Denmark and Germany most of the UHF antennas used X-shaped bows similar to the bowtie elements used in the Channelmaster 4221 and 4228. Is there any advantage or disadvantage to the solid bowties versus the X's?
Are most of the other antennas you designed going to be similar to this one? Please provide some more pictures and information on the other antennae.
P.S. how is the weight balance on that thing? It seems like the center of gravity would be way to the front. Maybe a counterweight or cantilever mount option?
Let me get this straight, this show is hi-def and 5.1, but my local affiliate makes it crappy NTSC and mono?!
[This message has been edited by JimboG (edited 09-25-2001).]
That antenna is not quite the finished product. The finished product will have a mesh cylindrical parabolic back reflector. Also the driven element in the picture is just a simple di-pole. The actual driven element is a very unique design that we do not want to show until we have finished all of the patent applications. It will be fairly large in a three-dimensional shape for increased bandwidth, per channel, and across the UHF band with improved impedance. The back reflector also incorporates a shield for multi-path, this antenna was designed for a challenge I received from a now defunct dot com that was in the Manhattan Financial district. They had tried many, many different antenna designs and none worked, so I made this one for them. One of my other designs, which we will release later also worked there. There are some other special differences here that I donâ€™t want to let out of the bag. There will be an official press release in TWICE on Thursday(?)
This antenna is good to 40 miles here in IL where it is flat. We are designing some pre-amps specifically for DTV they well have only from 5 to 10 db of gain with a larger bw for the DTV signal.
The other antennas are quit different than this one it is the closest to a traditional antenna design and therefore easier to manufacture in the current factory in NJ. There are indoor antenna designs also.
The bow ties that CM uses are better for UHF than a di-pole.
Hmmm.. the $19.95 question is where and when can I buy one? I still haven't found a good solution to the OTA reception puzzle. Been trying a lot of different things, but nothing seems to work very well.
Digital antenna is not marketing hype, given the broadcast signal is an analog waveform, the antenna is called â€œdigitalâ€ because it is designed for the ATSC VSB system and the payload that system caries is digital. Calling the antenna digital is a lot easier calling it a fee space electromotive reception transducer up of analog waves caring a packetized MPEG digital signal on all of the product lit, not to mention the products box. This is the same as calling a DTV set top box digital when the input, radio waves and the output, Component or RGB are in fact analog. The name digital antenna refers to the design of the antenna for a specific system. The pre-amp situation is the same as the antenna. I hope that dots my â€œiâ€s and cross my â€œtâ€s.
I should know when they are shipping in about a week.
One of the next antennas we release will work exceptionally well for that application. It is directional, about a 160 degree reception pattern, and it is better at multi-path reject than even a log P.
If you want, send an e-mail you could try just the driven element of the antenna mentioned and it may work at 180 degrees, might be practical for your application, but not the rest of the world.
I have a very slick solution for the UHF VHF combo, I hopefully will be able to tell you about it soon. I just received some more patent applications to sign today, that one should be up soon.
Define fringe in distance and terrain please. I may have an answer.
The reason that these antennas are primarily designed for urban and suburban installations is two fold, I was challenged by the claims of 8 VSB not working well in urban areas, I knew ways to make the reception better so I implemented them for the area of most concern. Second reason is most people live closer to the city. An antenna design for what you want is certainly very possible, a manufacturer needs to see the volume for a product like that and I can have one for them.
I do not want to give too much away. * VSB signals do not need a lot of signal amplitude to create a robust picture. Too much gain amplifies unwanted reception, overloads the receiverâ€™s front end (harder to do than most people think) and confuses the receivers error correction and equalizer.
This antenna is good to 40 miles here in IL where it is flat.
I have found that ANY antenna is good for 40 miles in flat terrain.
I could maybe see a amp designed for a 8vsb, but a antenna is just picking up whatever it can. How can a antenna be designed to work better for digital? A digital only antenna is just marketing hype. If you put all the properties together such as high gain, low noise, narrow beamwidth and good F/B ratio, a good non-digital antenna will perform very well indeed.
Jim. I am very interested in your antennas. I live about 10 miles from the towers in Phladelphia, but live deep in a hole. I am able, with a CM 8 bow tie, to receive CBS, KYW on channel 6. The STB will lock on two others but generate only an intermittent picture, mostly in early AM or at night. Certainly not watchable. Do your attennas have more gain that the CM 8 bay? Thanks. I would love to be able to pull in the other channels rather than pay for cable which is coming in November.
You do not need more gain. You need a better signal. My guess it that you have multi-path problems. Yes my antennas would work well there. I signed the patent materials today and I think I will have a ship date by the end of the day on Monday.
Would you like for me to see how your antenna stacks up against the others? I've done some extensive, conclusive comparison tests with the most popular top performing antennas out there. They are documented in this thread: http://www.avsforum.com/ubb/Forum11/HTML/013407.html
I could either purchase one or you could send me one to try for evaluation.
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