Source : https://archive.org/details/2002-L-02197
Inflatable Antenna/Bandpass Antenna Element
Source : https://archive.org/details/2002-L-02197
Broadband TV Antenna Chireix-Mesny
The simple broadband TV antenna works at the 615- 765- MHz. Antenna has input impedance 300- Ohm at
the pass band. Antenna may be used with antenna
amplifier that has such input impedance.
The antenna is a variant of the famous Chireix- Mesny
Antenna.
Antenna may be used with coaxial cable with
broadband transformer. switched to the TV 150- MHz.
Figure 1 shows design of the antenna.
Figure 2 shows impedance of the antenna (antenna placed at 7- meter above the real ground). Figure 3 shows SWR of the antenna (antenna placed at 7- meter above the real ground). Figure 4 shows DD of the antenna (antenna placed at 7- meter above the real ground). The MMANA model of the Chireix- Mesny TV Antenna may be loaded: http: // www.antentop.org/018/chireix_018.htm Note I.G.: Chireix- Mesny Antenna was designed in France by Henri Chireix, Chief Engineer of the Societe Francaise Radiotelectrique, and Rene Mesny, Professor of Hydrography in the French Navy. Papers on the antenna were published (in different variations) in the 1926- 1928s. Patent H. Chireix: French Patent # 216,757, filed Mar. 10, 1926. Antenna originally was used for directive radiation and reception at short waves. Lately the antenna was widely used at VHF- UHF waves.
(Source : Antentop)
Figure 1 shows design of the antenna.
Figure 2 shows impedance of the antenna (antenna placed at 7- meter above the real ground). Figure 3 shows SWR of the antenna (antenna placed at 7- meter above the real ground). Figure 4 shows DD of the antenna (antenna placed at 7- meter above the real ground). The MMANA model of the Chireix- Mesny TV Antenna may be loaded: http: // www.antentop.org/018/chireix_018.htm Note I.G.: Chireix- Mesny Antenna was designed in France by Henri Chireix, Chief Engineer of the Societe Francaise Radiotelectrique, and Rene Mesny, Professor of Hydrography in the French Navy. Papers on the antenna were published (in different variations) in the 1926- 1928s. Patent H. Chireix: French Patent # 216,757, filed Mar. 10, 1926. Antenna originally was used for directive radiation and reception at short waves. Lately the antenna was widely used at VHF- UHF waves.
(Source : Antentop)
Rhombic Antenna Transmitter for Distance Receiving of TV Antenna
Below it is
described one of those antennas- it is a Rhombic
Antenna. Rhombic Antenna is easy to make and at the
same time has perfect parameters.
Rhombic Antennas are easy to build and at the same
time has high gain and good diagram directivity.
However the antennas have some lack. Such antennas
required lots space for installations and need at least
for masts instead one that used to support traditional
directional antennas.
Figure 1 shows design of the Rhombic Antenna. Rhombic Antenna is a rhomb that hang up horizontally at the ground. Feeder is connected on to one sharp angle of the rhomb. Terminated resistor is connected on to far sharp angle of the rhomb. The resistor’s value should be equal to the impedance of the rhomb at the working frequencies of the antenna. As usual the value is near 700- Ohm. Working frequencies of the antenna may have pass band in hundreds megahertz. So using such matched resistor allows create a super broadband antenna that has impedance near 700- Ohm at the frequencies window in several hundred megahertz. High gain and high directivity of the rhomb antenna could be explained by combining gain and diagram directivity of the parts of the antenna. The antenna consists of four wires with traveling wave.
Figure 2 shows the combination. Each wire has own gain and diagram directivity.
The gain and diagram directivity depends on ratio the length of the wire to the working wavelength. So, the summary gain and diagram directivity depends on the ratio the length of the wire to the working wavelength and to the sharp angle of the rhomb.
Table 1 shows data for Rhombic Antenna with different parameters. To keep such parameters antenna should be placed above the ground at height not less the 2- 3 wavelength of the working band of the antenna. Antenna may be fed by open ladder line with wave impedance 300… 600- Ohm. At this case the antenna could be matched at all working frequencies band. Antenna may be fed through a coaxial cable when two simple matching transformers are used.
Figure 3 shows feeding Rhombic Antenna through a coaxial cable. First transformer is a broadband transformer made on two wire ladder line. It is two wires line with varying wave impedance on the length. The wave impedance of the line changes from 700- Ohm at rhomb side to 300- Ohm at coaxial cable side.At coaxial cable side the coaxial cable should not connect straight away to the line. Coaxial cable connected to the line through a symmetrical transformer 4:1 made on lengths of the used coaxial cable. The transformer makes symmetrical and provides matching of the Rhombic Antenna to coaxial cable. Loop of the coaxial cable should have electrical length lambda/2. To calculate such transformer you need to know the shortening coefficient of the used coaxial cable.
It is possible to use coaxial cable with any wave impedance- 50 or 75 Ohm. Matching impedance of the 4:1 transformer depends on the coaxial cable. At 50- Ohm cable it is got transformer 200:50- Ohm, at 75- Ohm cable it is got transformer 300:75- Ohm. Transformer 300:75- Ohm should have best matching result with open line transformer. There are lots link in the internet how the transformer may be calculated.
One of them is:http://www.nlemma.com/calcs/dipole/balun.htm. When the coaxial cable symmetrical transformer is used the broadband of the antenna depends on the broadband of the transformer. As usual coaxial cable transformer has good matching at the 5% frequencies band calculated from the central working frequency of the transformer. So, when such transformer is used the broad band of the Rhombic Antenna is limited to pass band of the transformer. Antenna may be made from a strand wire in diameter 2… 3- mm. It may be copper, aluminum or bimetal (with copper or aluminum layer) wire. Terminated resistor at the antenna may be any small power noninductive resistor. This one should be protected from atmospheric influences. (Source : Antentop)
Figure 1 shows design of the Rhombic Antenna. Rhombic Antenna is a rhomb that hang up horizontally at the ground. Feeder is connected on to one sharp angle of the rhomb. Terminated resistor is connected on to far sharp angle of the rhomb. The resistor’s value should be equal to the impedance of the rhomb at the working frequencies of the antenna. As usual the value is near 700- Ohm. Working frequencies of the antenna may have pass band in hundreds megahertz. So using such matched resistor allows create a super broadband antenna that has impedance near 700- Ohm at the frequencies window in several hundred megahertz. High gain and high directivity of the rhomb antenna could be explained by combining gain and diagram directivity of the parts of the antenna. The antenna consists of four wires with traveling wave.
Figure 2 shows the combination. Each wire has own gain and diagram directivity.
The gain and diagram directivity depends on ratio the length of the wire to the working wavelength. So, the summary gain and diagram directivity depends on the ratio the length of the wire to the working wavelength and to the sharp angle of the rhomb.
Table 1 shows data for Rhombic Antenna with different parameters. To keep such parameters antenna should be placed above the ground at height not less the 2- 3 wavelength of the working band of the antenna. Antenna may be fed by open ladder line with wave impedance 300… 600- Ohm. At this case the antenna could be matched at all working frequencies band. Antenna may be fed through a coaxial cable when two simple matching transformers are used.
Figure 3 shows feeding Rhombic Antenna through a coaxial cable. First transformer is a broadband transformer made on two wire ladder line. It is two wires line with varying wave impedance on the length. The wave impedance of the line changes from 700- Ohm at rhomb side to 300- Ohm at coaxial cable side.At coaxial cable side the coaxial cable should not connect straight away to the line. Coaxial cable connected to the line through a symmetrical transformer 4:1 made on lengths of the used coaxial cable. The transformer makes symmetrical and provides matching of the Rhombic Antenna to coaxial cable. Loop of the coaxial cable should have electrical length lambda/2. To calculate such transformer you need to know the shortening coefficient of the used coaxial cable.
It is possible to use coaxial cable with any wave impedance- 50 or 75 Ohm. Matching impedance of the 4:1 transformer depends on the coaxial cable. At 50- Ohm cable it is got transformer 200:50- Ohm, at 75- Ohm cable it is got transformer 300:75- Ohm. Transformer 300:75- Ohm should have best matching result with open line transformer. There are lots link in the internet how the transformer may be calculated.
One of them is:http://www.nlemma.com/calcs/dipole/balun.htm. When the coaxial cable symmetrical transformer is used the broadband of the antenna depends on the broadband of the transformer. As usual coaxial cable transformer has good matching at the 5% frequencies band calculated from the central working frequency of the transformer. So, when such transformer is used the broad band of the Rhombic Antenna is limited to pass band of the transformer. Antenna may be made from a strand wire in diameter 2… 3- mm. It may be copper, aluminum or bimetal (with copper or aluminum layer) wire. Terminated resistor at the antenna may be any small power noninductive resistor. This one should be protected from atmospheric influences. (Source : Antentop)
Broadband TV Antenna Design
The simple broadband TV antenna works at the 580- 760- MHz. Passband of the antenna is 180- MHz.
Antenna has input impedance 300- Ohm at the pass
band.
The Design also can modified from Band frequency 470-806 and with impedance 50 Ohm.
Antenna may be used with antenna amplifier that has such input impedance. Antenna may be used with coaxial cable with broadband transformer. The antenna is critical to any nearby metal subjects. Place the antenna with isolator connected to Antenna body and tower or antenna holder.
They can destroy the DD of the antenna. Space in 50 cm near the antenna should be free from such metal or conductive subjects. If antenna is used for reception purposes the best way is place low noise amplifier at the antenna terminal.
LNA or Low Noise Amplifier can be made with 2SC3358 or 2SC3355, Low Noise Wideband Amplifier 0 - 1 GHz
Figure 1 shows view of the antenna. Figure 2 shows design of the antenna. Figure 3 shows impedance of the antenna (antenna placed at 7- meter above the real ground). Figure 4 shows SWR of the antenna (antenna placed at 7- meter above the real ground). Figure 5 shows DD of the antenna (antenna placed at 7- meter above the real ground). The MMANA model of the Broadband TV Antenna may be loaded: http: // www.antentop.org/018/ur0gt_tv_018.htm (Source : Antentop with modification in content)
The Design also can modified from Band frequency 470-806 and with impedance 50 Ohm.
Antenna may be used with antenna amplifier that has such input impedance. Antenna may be used with coaxial cable with broadband transformer. The antenna is critical to any nearby metal subjects. Place the antenna with isolator connected to Antenna body and tower or antenna holder.
They can destroy the DD of the antenna. Space in 50 cm near the antenna should be free from such metal or conductive subjects. If antenna is used for reception purposes the best way is place low noise amplifier at the antenna terminal.
LNA or Low Noise Amplifier can be made with 2SC3358 or 2SC3355, Low Noise Wideband Amplifier 0 - 1 GHz
Figure 1 shows view of the antenna. Figure 2 shows design of the antenna. Figure 3 shows impedance of the antenna (antenna placed at 7- meter above the real ground). Figure 4 shows SWR of the antenna (antenna placed at 7- meter above the real ground). Figure 5 shows DD of the antenna (antenna placed at 7- meter above the real ground). The MMANA model of the Broadband TV Antenna may be loaded: http: // www.antentop.org/018/ur0gt_tv_018.htm (Source : Antentop with modification in content)
Digital TV Antenna Outdoor
According to frequency range of the Digital TV Outdoor Antenna :
For Band VHF : 170 MHZ - 230 MHZ, Which is television channels 7–13 (VHF-Hi), known as "Band III" internationally. A number of DTV channels have begun broadcasting here, especially many of the stations which were assigned to these channels for previous analog operation.
The U.S. FCC
allocated television broadcasting to a channelized roster as early as
1938 with 19 channels. That changed three more times: in 1940 when
Channel 19 was deleted and several channels changed frequencies, then in
1946 with television going from 18 channels to 13 channels, again with
different frequencies, and finally in 1948 with the removal of Channel 1
(analog channels 2-13 remain as they were
For Band UHF : 470 MHZ - 860 MHZ
Specification of this Digital TV Antena Outdoor :
What Purchaser said about this Antenna ?
For Band VHF : 170 MHZ - 230 MHZ, Which is television channels 7–13 (VHF-Hi), known as "Band III" internationally. A number of DTV channels have begun broadcasting here, especially many of the stations which were assigned to these channels for previous analog operation.
The U.S. FCC
allocated television broadcasting to a channelized roster as early as
1938 with 19 channels. That changed three more times: in 1940 when
Channel 19 was deleted and several channels changed frequencies, then in
1946 with television going from 18 channels to 13 channels, again with
different frequencies, and finally in 1948 with the removal of Channel 1
(analog channels 2-13 remain as they wereFor Band UHF : 470 MHZ - 860 MHZ
- UHF citizens band(Land mobile service): 476–477 MHz
- Television broadcasting uses UHF channels between 503 and 694 MHz
Australia
Canada
- 470–806 MHz: Terrestrial television (with select channels in the 700 MHz band left vacant)
- United Kingdom
- 470–862 MHz: Previously used for analogue TV channels 21–69 (until 2012).
- Currently channels 21–35, 37 and 39–60 are used for Freeview digital TV.[6] Channel 36 is used for radar; channel 38 was used for radio astronomy but has been cleared to allow PMSE users access on a licensed, shared basis.
- 791–862 MHz,[7] i.e. channels 61–69 inclusive were previously used for licensed and shared wireless microphones (channel 69 only), has since been allocated to 4G cellular communications.
- United States
- 470–512 MHz: Low-band TV channels 14–20 (shared with public safety land mobile 2-way radio in 12 major metropolitan areas scheduled to relocate to 700 MHz band by 2023[11])
- 512–608 MHz: Medium-band TV channels 21–36
- 608–614 MHz: Channel 37 used for radio astronomy and wireless medical telemetry[12]
- 614–698 MHz: Mobile broadband shared with TV channels 38–51 auctioned in April 2017. TV stations will relocate by 2020.
Specification of this Digital TV Antena Outdoor :
- Easy To Install : : Need common Tools set and Ladder if you have no access to roof , cabling path is easy to set , follow your house space wall.
What Purchaser said about this Antenna ?
This Antenna Digital very Excellent for Outdoor use. You assembled the antenna by hand using the enclosed directions, easy
no tools needed. Powered and tested the rotation/motor of the antenna
in the house, worked as expected (didn’t use the remote as I didn’t have
batteries, used the dock). Grabbed my ladder and tools with additional
wood screws and washers as the package only contained 2 wood screws
(not enough if you ask me). Climbed on to my roof and mounted the
bracket on the side of my chimney tunnel exit than mounted the assembled
antenna with pole. Ran the antenna’s coaxial cable down the side of my
house and used a flat coaxial jumper cable to get it through my window
seal into my house as I did not want to drill through my wall. Once I
plugged in a second coaxial from the window flat jumper cable inside my
house to the antenna power box and a third coaxial cable from the power
box to my TV, I was in business... I troubleshooted the antenna rotation
using our favorite channel that used to be fuzzy and studdered until I
got great reception. The great news... once our favorite channel was
in perfect reception, I used the settings on my TV to auto save all
view able channels and now I have a TOTAL OF 54 CHANNELS (we live in
Belton MO) that my family and I can watch!! That’s a win if you ask me.
We had under 10 channels that stuttered before with our typical indoor
antenna. Now to see how far it holds up and see how well it works
during bad weather like rain and snow, not so sure if the material would
hold up in Arizona sun but will be willing to try when we move back.
Another Purchaser commented :
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Original problem
WA 2608 150 mile range antenna. I have had my antenna hooked up 6 days. Assembly was easy. Installation instructions were clear. However after I installed it and used compass points to aim it, I ran a scan I did not pick up channels 65 miles away (per antenna point app and antennaweb), I did however get 29 channels from closer towers. Tried running scans at different times of the day and night to see if that effected anything bc a few of the channels would go in and out while watching a program. Then it just quit picking up any channels at all. Tried multiple scans but got zero channels. Emailing Service Team.