ENG System Performance: Frequency vs. Rejection |
||||
Usage |
Frequency |
PHILLIPS MICROTEK SuperFilter/LNA-SP3 |
Microwave Radio-1996 Ultrascan |
Microwave Radio-latest Ultrascan |
|---|---|---|---|---|
| PCS Mobiles |
1800 Mhz | >140 db | 35 db | 87.1 db |
| 1900 Mhz | >140 db | 7 db | 71.2 db | |
| PCS "A" | 1930 Mhz | >140 db |
3 db |
55.6 db |
| PCS "B" | 1950 Mhz | >140 db |
1 db |
44.1 db |
| 1965 Mhz | >140 db | 1 db | 30.9 db | |
| PCS "C" | 1975 Mhz | >140 db | 1 db | 19.8 db |
| 1982.5 Mhz | >110 db |
1 db |
9.6 db |
|
| 1989.5 Mhz | 69.5 db |
1 db |
1.5 db |
|
So what does this mean for you? When a -20 dbm 1985 MHz PCS signal hits Microwave Radio's latest and improved Ultrascan Antenna System, the unwanted PCS signal at the output, going to your receiver, is a damaging +20 dbm, or 100 milliwatts! If you use our SuperFilter/LNA, this unwanted signal is less than -90 dbm! Closer to the edge of the band, the Ultrascan is totally saturated, while our SuperFilter/LNA is still down almost 70 db!
This is the BLOCK "C" PCS Band, 1975-1990 Mhz, adjacent to 2 GHz ENG ch 1.
The marker is at 1.989 00 Ghz. The PCS attenuation on our SuperFilter/LNA
is -69.5 db.
The RED trace is the latest Ultrascan
Antenna System Filter in the LNA shipped to WSFA-TV.
The GREEN trace is our SuperFilter/LNA, ordered in 1996 by WSOC
& WBTV, Charlotte, NC.
Actual signal through a new Microwave Radio Ultrascan Filter (RED).
A PCS signal is attenuated only 9 db at the center of
Block "C" PCS Band, and only 1.2 db near ENG channel 1.
The PHILLIPS MICROTEK SuperFilter/LNA's attenuation is 69.5 db near the edge of ENG channel 1 (1,989 MHz), while the new Ultrascan would attenuate the same PCS signal only 1.7 db. Since the output of the Ultrascan's filter is fed to a high power LNA, it is possible to blast almost a 1 watt RF pulse into the front end of your receiver!
This is the BLOCK "B" PCS Band, 1950-1965 Mhz.
This is the band that produces Image Frequencies that degrade ENG channels 5, 6, and 7..
The marker is sitting at 1.957,50 Ghz. The PCS attenuation on our SuperFilter/LNA
is >90 db.
The RED trace is the new 1997 Ultrascan LNA Filter shipped to WSFA-TV.
The GREEN trace is our SuperFilter/LNA shipped last year to WSOC
& WBTV, Charlotte, NC.
39 db attenuation may sound good. However, there is an LNA after this filter that
will boost signals almost 30db!
This is the ENG Channel 1. You can see that our SuperFilter/LNA is acceptable for audio subs up to 6.2 MHz.
The RED trace is the new 1997 Ultrascan LNA Filter shipped to WSFA-TV.
The GREEN trace is our SuperFilter/LNA shipped last year to WSOC
& WBTV, Charlotte, NC.
At the center of channel 1, attenuation is 1.2 db
The delta reference marker is sitting at 1999 MHz, the center of channel 1. The delta
marker is -1.7 db at 1994 Mhz..
The attenuation drastically increases to more than 50 db at the lower edge of channel 1,
the start of the PCS Band.
Only the PHILLIPS MICROTECHNOLOGY SuperFilter/LNA-SP3, is designed to work within close range of a PCS site! Block "C" PCS will degrade or overload virtually all other systems.
Other companies claim that their LNAs are as clean as ours. But when you're trying to take a -60 dbm feed from your live eye, do you really want a clean +20 dbm PCS signal overloading your receiver????? We Guarantee that your receiver will never be overloaded by PCS, when you use our SuperFilter/LNA System!
All test equipment was locked to a Rubidium Frequency Standard to insure measurement accuracy