Is my LNB ok,or not (Psecs inside)

karism

Halo Everyone,

I have a Gospell C-band Lnb that i currently use.

Specs are as follows :


Image Rejection
45 dB (Min.)
F/D Ratio
0.28~0.42(Adjustable)

Cross Pol.lsolatin
20 dB (Typ.)
Input Reflector Type
Prime Focus

Gain Flatness
±4dB(500MHz)
Noise Figure
17 °K (Typ.)

L.O.Frequency
5.150 GHz
Conversion Gain
62dB(Typ.) 55dB(Min.)

Input RF Frequency Range
3.4~4.2 GHz
L.O.Frequency Stability
1.0MHz @ 25°C

±2.5MHz @-40°C - +60°C

Output Frequency Range
950~1750MHz
L.O.Phase Noise
-60dBc/Hz (1kHz Offset)

-85dBc/Hz (10kHz Offset)

Output Return Loss
7.5 dB
Output Power(at 1dB

gain compression)
0dB (Min.)

Polarity Switching Voltage
V: 11.5V - 14.5V

H: 15.8V - 18.0V
Output Connector
75ΩF type female

D.C. Current Consumption
150 mA (Max.)
Operating Temperature
-40 ℃~+60 ℃

Is it good quality,or just ok?

Thanks!

Karis

Likvid

I would try out a real quality LNB like the Gardiner 12K C-band LNB that can be bought for cheap on Ebay USA.

If you don't have anything to compare with you never know.

Ebay 200109022797

karism

Thanks for the reply Bud!

Ok,i have another LNb (this one came with the 3m)

Which one of the two would you say is better.I have learnt,its not just about the gain,but the noise as well?

Item Description

LNBF C-Band single cable solution 3.7 - 4.2 GHz

Specifications

Manufacturer MTI
Model Number AC15-2CV

Input
Frequency Range H: 3.7 - 4.2GHz
V: 3.7 - 4.2GHz

Output
Frequency Range H: 950 - 1450MHz
V: 1500 - 2000MHz
Connector Type 75Ω Female Connector
VSWR 2.5:1 (max)

Local Oscillator
Frequency H: 5.150GHz
V: 5.7GHz
Frequency Stability ±1MHz (max) @ room temp.
±2.5MHz (max) @ -40°C ~ +60°C
Frequency Phase Noise -75dBc/Hz (typ) @ 1kHz @ room temp
-93dBc/Hz (typ) @ 10kHz @ room temp
-105dBc/Hz (typ) @ 100kHz @ room temp

Conversion Performance at Room Temp
Conversion Gain 60dB (min)
Gain Flatness ±5dB (max) over operating band
±1.5dB (max) / 36MHz
Noise Temperature 25°K(max)
Image Rejection 40dB (min)
Cross Polarisation 20dB (typ)

Power Requirements
DC Current Consumption 150mA (max)
Operating Voltage 12- 24VDC

Thanks!

Karis

karism

Forgot to say.

Thanks for giving me some pointers!

Likvid

Don't worry about gain with a large dish like that.

High gain can also be bad for stronger signals and sometimes you need an attenuator for it.

I had C-band LNBs from 45K to 18K and there is some difference but when it comes to C-band the size of the antenna is the king so get the biggest antenna you can afford.