DXE-NCCFL
Example – 80 meters “L” bandpass and 20 meters “H” highpass
As an example, an 80 meter DX enthusiast may elect to install two 80 meter band pass NCC-1 Receive Filters, part
number DXE-NCCFL-BPF80M, into their NCC-1 "L" BAND slots. This would dedicate their NCC-1 to 80 meter-only
operations. Setting the BAND switch to L would dramatically reduce noise and signals from outside the 80 meter band,
very effectively excluding interference from nearby AM Broadcast, 160 and 40 meter stations. A much lower noise
floor on 80 meters could be achieved for dramatically enhanced reception of weak 80 meter DX signals. An additional
pair of filters could be installed into the "H" BAND slots, to enhance reception on the higher HF bands. For example,
installing 20 meter high pass filters, part number DXE-NCCFL-HP20M, and switching to BAND H would drastically
reduce all received noise and signals from frequencies below 13.70 MHz. With advanced planning of additional filter
availability, an NCC-1 owner could even swap different filter sets for optimal operations in different contests or band
pursuits.
Receive Filter Sets
The advanced plug-in filter modules (DXE-NCCFL Series) offer
frequency-specific receive system enhancements for the DXE-
NCC-1 Receive Antenna Phasing Controller. All filter sets are
available in matched pairs of low-pass, band-pass and high-pass
frequency ranges. Filter cut-off and center frequencies correspond
to the major Amateur bands, 160, 80, 40, 20, 15 and 10 meters,
with an insertion loss of only about 1 dB.
Operation
By default, empty NCC-1 filter slots have jumpers to pass all signals.
On the NCC-1 front panel, the BAND toggle switch "L" or "H" positions activate one of two filter
sets, allowing over 360 degrees of phase rotation in two frequency ranges. The BAND switch “L”
position covers from 850 kHz to 8 MHz. The BAND switch “H” position covers from 2 MHz to 15
MHz. Frequencies outside these ranges will have less than 360 degrees of phase rotation. NCC-1
Receive Filters must be placed into the proper BAND filter slots corresponding to desired usage.
NCC-1 Receive Filters are installed in pairs (2 of the same type), so both NCC-1 receive antenna
inputs "A" and "B" have the same pass-band characteristics. Band-pass, high-pass or low-pass
filters are available for users to choose and install into their NCC-1 for their specific application
needs. By reducing or excluding frequency-specific interfering noise and signals, the noise floor of
the desired pass-band can be lowered for dramatically improved reception.
You can install one set or two sets depending on your desired filtering.
NCC-1 "L" and "H" slots may be populated with pairs of band-pass, high-pass or low-pass filters to
suit the specific signal rejection needs of the discerning operator.
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Filter Graphs
The following 18 charts show the response curves for the 18 optional filters that are available for
the NCC-1.
DXE-NCCFL-LP160M - Low Pass, 160 M and below - Cut off Frequency 2.30 MHz
DXE-NCCFL-LP80M - Low Pass, 80 M and below - Cut off Frequency 4.00 MHz
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DXE-NCCFL-LP40M - Low Pass, 40 M and below - Cut off Frequency 7.50 MHz
DXE-NCCFL-LP20M - Low Pass, 20 M and below - Cut off Frequency 15.00 MHz
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DXE-NCCFL-LP15M - Low Pass, 15 M and below - Cut off Frequency 22.00 MHz
DXE-NCCFL-LP10M - Low Pass, 10 M and below - Cut off Frequency 30.00 MHz
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