Technical Articles for Part Number DLW-FL1718
DLW Associates AM Broadcast Band Brick-Wall High Pass Filters
High Pass Filter, AM Broadcast Band Reject, Brick-Wall, 200 W CW & SSB, SO-239, Each
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Overview
Brand:
Manufacturer's Part Number:
FL1718
Part Type:
Product Line:
DXE Part Number:
DLW-FL1718
UPC:
611355003761
Frequency Range:
1.8-54 MHz
Power Handling:
200 W
Stop Band Rejection:
Over 40dB
Pass Band Insertion Loss:
less than 0.2 dB
VSWR:
less than 1.2:1
Return Loss:
Over 20 dB
Impedance (ohms):
50
RF Connector Type:
UHF female, SO-239
Enclosure Type:
Sealed
Enclosure Material:
Aluminum
Height (in.):
2.300 in.
Width (in.):
3.200 in.
Depth (in.):
5.000 in.
Weight:
2.000 lbs.
Quantity:
Sold individually.
Notes:
Blocks AM broadcast (MW) signals. Passes 1.8 to 54 MHz with very small insertion loss.
DLW Associates AM Broadcast Band Brick-Wall High Pass Filters
DLW Associates AM Broadcast Band Brick-Wall High Pass Filters are 9th order elliptic designs that have a very sharp slope occurring between 1.8 and 1.7 MHz. These filters effectively attenuate all AM broadcast band signals in excess of 40 dB. It's just as if those signals run into a brick wall!
Proper location for these filters is at the output of an HF transceiver and before an amplifier, antenna tuner or antenna. They are optimized for a 50 ohm input and output impedance.
These filters are packaged in high-quality cast aluminum (O-ring sealed) cases with SO-239 flanged PTFE dielectric coaxial fittings. Their components consist of high-Q high-voltage NPO ceramic and mica capacitors and high-Q toroidal coils mounted on a double sided printed circuit board. The PCB and coils are coated for stability and long life. All mounting hardware is of quality stainless steel.
FL1718 filter specifications:
* Maximum transmit power ratings: 200W CW or SSB
* Pass band loss: less than 0.85dB (1.8 to 54 MHz)
* Stop band loss: greater than 40dB (1.7 MHz and below)
* Return loss: less than 20dB (1.8 - 54 MHz)
* SWR: less than 1.2:1 (1.8 - 54 MHz)
Got BCI on 160 meters or higher? Broadcast Band Interference is common when your location is near AM Broadcast stations. Put up a brick wall against it! Order DLW Associates AM Broadcast Band Brick-Wall High Pass Filters from DX Engineering.
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Some parts are not legal for use in California or other states with similar laws / regulations
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