Lark Engineering SDN SERIES
BAND REJECT FILTERS
SDN Series
SPECIFICATIONS
ELECTRICAL
Notch Center Frequency (Fc)
Notch Width (% of FC)
Notch Depth
Number of Sections Available
Resonator Size (mm)
Resonator Size (inches)
Nominal Impedance
Maximum Insertion Loss
Maximum VSWR
STANDARD
800 to 2500 Mhz
1 to 5
10 to 60 dB
3 to 6
3 to 8
.12 to .32
50 Ohms
1.25 to 3.0 dB
2/1
*SPECIAL
400 to 3500 MHz
.5 to 10
10 to 60 dB
2 to 8
2 to 12
.08 to .5
50 to 75 Ohms
0.85 to 3.0 dB
1.5/1
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Lark Engineering SDN SERIES
Maximum Input Power (Average)(Watts to
10,000 ft.)
Maximum Input Power (Peak)(Watts to 10,000
ft.)
ENVIRONMENTAL
Shock
Vibration
Humidity
Altitude
Temperature Range (Operating)
1
2
2
10
15 G's
5 G's
90% relative
Unlimited
-30 to + 85 degrees
celsius **
-40 to +100 degrees
celsius
L x W x H x 50
Specifications
75 G's
30 G's
100% relative
Unlimited
-54 to + 100 degrees
celsius
-62 to +150 degrees
celsius
L x W x H x 50
Specifications
Temperature Range (Non-Operating)
MECHANICAL
Approximate Weight in Grams
Mounting Provisions
*Contact Lark Applications Engineering
**For 1 to 1.5%BW, 0°C to + 50°C
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Lark Engineering SDN SERIES
Note 1- Additional plated thru holes will be
provided on this edge, as space allows.
Note 2- All Dimensions are in inches unless
otherwise specified.
For widths (W) greater than .400, Insulating
gap (G) is .140 for width (W) greater than .400
and pad size (T) is .100.
For widths (W) less than .400 and /or FC
greater than 3000 Mhz, Insulating gap (G) is
.100 and Pad size (T) is .070.
The approximate width (W) of a Lark SD
Series filter can be determined by the formula:
W=N X RS +.09
Where N is the number of sections and RS is
the resonator size in inches (see below). The
minimum possible width (W) is .250, the
maximum height (H) of a Lark SD Series is
determined by the chart below:
The approximate length of a Lark SD filter is a
function of the PCB carrier and the resonator
size (see below). Standard lengths of Printed
Circuit Boards are .250, .500, and .750.
Resonators can extend beyond the length of the
PCB as much as .150 until the next PCB will
be used. The length (L) is equal to:
L(max)= FAC/Fc + .C
Where:
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