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Amateur Radio Filters For an introduction to issues relating to filtering HAM radio signals, please take a look at our Amateur Radio FAQ. See additional pricing and options on the pricing page. via e-mail Subject: Filters - Very impressed! Hi,Having recently used your filters for the first time, I must complement you on an excellent product. Like many amateurs, we have suffered from chronic interference in cities and near commercial installations, partly due to the increased amount of radio transmissions and partly from the wide-band nature of most modern amateur equipment. Having used your filters for the first time (a 145-2H and 435-10C pair, with duplexers for single aerial working on both ends), they have killed all known interference dead! Although I have not made any accurate measurements, we are certain that the radios are actually more sensitive, despite the insertion loss of the filters plus 2 duplexers, as they are not being descended by the out-of-band RF. Regards Jim Andrews G1HUL Two Meter 4 MHz Wide 4 Pole Bandpass Filter (Model: DCI-146-4H) 
W 12" x D 6" x H 3" 
Skirts 
Pass SWR This filter is a general purpose filter used for reducing intermod anywhere in the 2-meter band. The filter's design is four helical resonators with aperture coupling. Type "N" connectors are optional, and cost an additional $10. Connector Type: SO-239 silver-Teflon� Selling Price in USD (exclusive of shipping costs): $424.00 (Lead time : 1-2 Weeks) Two Meter 2 MHz Wide 4 Pole Bandpass Filter (Model: DCI-145-2H) 
W 12" x D 6" x H 3" 
Skirts 
Pass SWR The DCI-145-2H (144-146 MHz) filter is identical in design and appearance to the DCI-146-4H, but has a narrower bandwidth. This filter is for use in European-Asian ITU Regions 1 and 3. It is also for use in North America for weak signal, OSCAR, packet and EME communications. Type "N" connectors are optional, and cost an additional $10. Connector Type: SO-239 silver-Teflon� Selling Price in USD (exclusive of shipping costs): $424.00 (Lead time : 1-2 Weeks) European / Asian UHF 10 MHz Wide 4 Pole Bandpass Filter (Model: DCI-435-10C) 
W 12" x D 8.5" x H 3" 
Skirts 
Pass SWR The design for this bandpass filter is four full quarter-wave linear resonators with aperture coupling. It comes with silver-Teflon�-gold "N" connectors. The filters are the same height and width as the VHF models but are slightly heavier and deeper. The DCI-435-10C is used in European-Asian ITU Regions 1 and 3, and is also used in North America for weak signal, packet and other specialized communications. Connector Type: "N" silver-Teflon�-gold Selling Price in USD (exclusive of shipping costs): $477.00 (Lead time : 1-2 Weeks) North American UHF 10 MHz Wide 4 Pole Bandpass Filter (Model: DCI-445-10C) 
W 12" x D 8.5" x H 3" 
Skirts 
Pass SWR The design for this bandpass filter is four full quarter-wave linear resonators with aperture coupling. It comes with silver-Teflon�-gold "N" connectors. The filters are the same height and width as the VHF models but are slightly heavier and deeper. The DCI-445-10C is used in North America for repeater and FM simplex voice communications. Connector Type: "N" silver-Teflon�-gold Selling Price in USD (exclusive of shipping costs): $477.00 (Lead time : 1-2 Weeks) 222-225 MHz 4 Pole Bandpass Filter (Model: DCI-223.5-3H) 
W 12" x D 6" x H 3" 
Skirts 
Pass SWR This filter is identical in design and appearance to the Two Meter bandpass filters, but is for use in the 222-225 MHz band. It is typically used on links and for reducing interference from Channel 13 TV transmissions on 210 to 214 MHz. Type "N" connectors are optional, and cost an additional $10. Connector Type: SO-239 silver-Teflon� Selling Price in USD (exclusive of shipping costs): $477.00 (Lead time : 1-2 Weeks) North American 146 and 444 MHz Dual Band Filter (Model: DCI-146-444-DB) 
W 8" x D 4" x H 4" This dual band filter is made of two-inch extruded aluminum cavities and will reduce intermod in the 2-meter band and the 70 cm band. The filter is designed to be used with dual band rigs with single feed lines. Connector Type: SO-239 silver-Teflon� Selling Price in USD (exclusive of shipping costs): $530.00 (Lead time : 1-2 Weeks) European 145 and 435 MHz Dual Band Filter (Model: DCI-145-435-DB) 
W 8" x D 4" x H 4" This dual band filter is made of two-inch extruded aluminum cavities and will reduce intermod in the 2-meter band and the 70 cm band. The filter is designed to be used with dual band rigs with single feed lines. Connector Type: N Selling Price in USD (exclusive of shipping costs): $530.00 (Lead time : 1-2 Weeks) North American 146 and 444 MHz Diplexer and Dual Band Filter (Model: DCI-146-444-DX-DB) 
W 8" x D 4" x H 4" This dual band filter is made of two-inch extruded aluminum cavities and will reduce intermod in the 2-meter band and the 70 cm band. The filter is designed to be used with dual band rigs with single feed lines. Connector Type: SO-239 silver-Teflon� Selling Price in USD (exclusive of shipping costs): $583.00 (Lead time : 1-2 Weeks) European 145 and 435 MHz Diplexer and Dual Band Filter (Model: DCI-145-435-DX-DB) 
W 8" x D 4" x H 4" This dual band filter is made of two-inch extruded aluminum cavities and will reduce intermod in the 2-meter band and the 70 cm band. The filter is designed to be used with dual band rigs with single feed lines. Connector Type: N Selling Price in USD (exclusive of shipping costs): $583.00 (Lead time : 1-2 Weeks) 6 Meter Bandpass Filter (Model: DCI-6M-cf-2-#p) 
Our 6m bandpass filters are available in 4-, 6-, 8- or 10-pole models.�This filter is custom-built and tuned to the center frequency you specify. Bandwidth will be 2 MHz. The filter is available in a stand-alone or rack-mountable design. Connector Type: Type "N" or SO-239 silver-Teflon® Two Meter Low Pass Filter (Model: DCI-160-LP) 
W 12" x D 2" x H 4" 
Skirts 
Pass SWR DCI has high-power, very low loss, low pass filters for 2 meters. Although the filters were designed for commercial use (with cut-offs of 160 MHz), they are very useful to amateurs as they will reduce your second harmonic by about 30 dB, and third and higher-order harmonics by over 50 dB. The filters go a long way towards reducing interference to 440 and 1296 from 2 meter transmitters in VHF/UHF multi-multi contest stations. DCI low pass filters are constructed with seven elements, with coaxial inductors and Teflon� capacitors. The filters go between the linear and the antenna and reduce the broadband noise and harmonics generated in the linear. The estimated power handling capability is 2 KW and the passband loss is about 0.1 dB. Connector Type: Type "N" 440 MHz Low Pass Filter (Model: DCI-500-LP) 
W 8.5" x D 2" x H 2" 
Skirts 
Pass SWR DCI has high-power, very low loss, low pass filters for 440 MHz. Although the filters were designed for commercial use (with cut-offs of 500 MHz), they are very useful to amateurs as they will reduce your second harmonic by about 30 dB, and third and higher-order harmonics by over 50 dB. The filters go a long way towards reducing transmitter interference to 1296 MHz and above, and will also protect a 440 MHz receiver from higher frequency transmitters. DCI low pass filters are constructed with seven elements, with coaxial inductors and Teflon� capacitors. The filters go between the linear and the antenna and reduce the broadband noise and harmonics generated in the linear. The estimated power handling capability is 2 KW and the passband loss is about 0.1 dB. Connector Type: Type "N" ATV Filter (Model: DCI-cf-bw-#p-x-y) 
W 19" x D 8" x H 6" DCI makes ATV filters which are 6 MHz wide to accommodate a standard fast scan TV signal. They are specified by the VCF (video carrier frequency) and the passband extends 1.25 MHz down from the VCF and 4.75 MHz up from the VCF if using upper sideband (USB). Note that USB is the default and filters will be tuned for USB if no sideband is specified. ATV filters are available in 8-pole and 10-pole models. An ATV filter can be used to reduce interference on receive and to remove the lower sideband and create a VSB signal from a DSB signal. Both the 8-pole and 10-pole give enough attenuation of the lower sideband in the transmitted signal. When ordering, please specify: cf = center frequency, bw = bandwidth, x = (S)tand-alone or (R)ack-mountable design, y = connector type: connector type (N, SO239, BNC, etc). Ex: DCI-483-6-10-R-N Bandwidth is tuned 1 dB down from center unless otherwise specified. |
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