Discussion:
Russian ILS antenna
(too old to reply)
lewradar
2005-03-06 20:18:39 UTC
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Please look at

Loading Image...

does anyone have a reference for an explanation of how that forked aerial
"swift rod" works??

Lewradar
unknown
2005-06-05 10:17:27 UTC
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This is not an IFF antenna, but the rear aerial for the short range navigation
system A320 (known as RSBN). A second antenna of same type is located
below the radar nose.

It is basicly a normal dipol antenna (L-band). The bended shape is responsible
for the antenna pattern, that has to cover a halve spere.

sprut
Post by lewradar
Please look at
http://www.bushcat.com/mpics/m29tail.jpg
does anyone have a reference for an explanation of how that forked aerial
"swift rod" works??
Lewradar
lewradar
2005-06-06 17:13:44 UTC
Permalink
As simple as that? The bar must be a reflector then?

Thanks, Sprut

Lewradar
Post by unknown
This is not an IFF antenna, but the rear aerial for the short range navigation
system A320 (known as RSBN). A second antenna of same type is located
below the radar nose.
It is basicly a normal dipol antenna (L-band). The bended shape is responsible
for the antenna pattern, that has to cover a halve spere.
sprut
Post by lewradar
Please look at
http://www.bushcat.com/mpics/m29tail.jpg
does anyone have a reference for an explanation of how that forked aerial
"swift rod" works??
Lewradar
unknown
2005-06-12 17:17:03 UTC
Permalink
Hallo

some more details:
Frequencyband:800-813 MHz and 726-1001 MHz

Picture of older version (used on MiG-21bis-sau since 1975 and on MiG-23)
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Picture of a damaged old antenna-version
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The antenna is 25 cm long and the reflector is 18 cm wide.
You can see an dielectric stripe in the middle of the dipole. A second one is at the opposite side of the shaft. I
have no idea about the stripe's function.
If I find more details about the antenna-function in my old notes, i will post it here.

The new version of the antenna is in use sice the 1980s and has only a new dipol shape.

The following picture shows the new antenna-version integrated into the pitot of a Su-25 bomber.
Loading Image...
This demonstrates that the nose cone of normal RSBN-antennas has no special function.

sprut
Post by lewradar
As simple as that? The bar must be a reflector then?
Thanks, Sprut
Lewradar
Post by unknown
This is not an IFF antenna, but the rear aerial for the short range navigation
system A320 (known as RSBN). A second antenna of same type is located
below the radar nose.
It is basicly a normal dipol antenna (L-band). The bended shape is responsible
for the antenna pattern, that has to cover a halve spere.
sprut
Post by lewradar
Please look at
http://www.bushcat.com/mpics/m29tail.jpg
does anyone have a reference for an explanation of how that forked aerial
"swift rod" works??
Lewradar
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