AM broadcast stations transmitting in the frequency range from 550kHz to 1700kHz cause havoc with HF and VHF receiving operations, often inducing carriers, modulation, broadband noise and other disturbances into delicate equipment.  Such interference can frequently be heard mixing with other received signals in the shortwave bands and commonly overwhelms front ends of modern receivers. Broadcast reject filters reduce AM band signals to levels where local Stations can still be received in most cases, but are no longer threatening to other desired services. A must for serious low frequency DXers or Amateur 160 Meter enthusiasts. Models are available for use with transceivers (allows transmission of up to 300 watts through the filter above the rated cutoff frequency).

Model M-400 unit is designed to operate above 3.5MHz and place the BCB band frequencies below, well into the stopband, inserting very high attenuation even at the higher end of the BCB band frequency segment

Model M-402X is designed for use all the way down to 1.8 MHz, attenuating everything below. All models are fitted with SO-239s connectors.  NOTE:  Visit manufacturer’s website www.surgestop.com for VNA plots and technical specs of these filters.

Complement modern transceivers with a Morgan bandpass filter to lessen or reduce out-of-band rf energy from nearby transmitters.  Our legacy model bandpass filters are available in affordable single band units, even including a model for citizen's band. Our filters are designed to pass only the listed frequency segments for which they are tuned, blocking all frequencies above and below the passband.

Use bandpass filters anywhere that critical single band performance is required, or where nearby transmitting stations cause interference to needed communications. Excellent for multiple-operator stations, portable or field use, non-polarized.

Circuit uses a twin section dual resonator design in a compact 3″ square heavy chassis. Units are rated for 200 Watts transmitter power.  SO-239 connectors standard. Packaged with owner’s manual.  Mounting footprint 4"x3".

NOTE:  Visit manufacturer’s website www.surgestop.com for VNA plots and technical specs of these filters.

Gain peak receiving and transmitting performance from modern transceivers and stop out-of-band rf energy from nearby transmitters with Morgan Systems high performance filter units.  Practically an international standard of the top competition stations, government agencies, and disaster relief organizations, bandpass filters are used widely to pass only the listed frequency segments for which they are tuned blocking all frequencies above and below the passband.

High performance units are computer optimized 5 pole topology, thoroughly hand tuned for maximum rejection of nearby bands.  Greater than 40dB of rejection of the next closest non-WARC bands is typical, with attenuation rising to over 65dB several bands away from the passband.

Use bandpass filters anywhere that critical single band performance is required, or where nearby transmitting stations cause interference to needed communications. Excellent for multiple-operator stations, contesting, field day, portable or fixed station use.

High performance filters are contained in a compact 4″ square heavy chassis. Units are rated for 200 Watts transmitter power.  SO-239 connectors standard. Packaged with owner’s manual.  Mounting footprint 4"x5".

NOTE:  Visit manufacturer’s website www.surgestop.com for VNA plots and technical specs of these filters.

Very similar to the Morgan M-474 series AC line filters found here, The Morgan M-471 will suppress or eliminate RFI that is being transmitted through the AC power cord from/to modern AC powered appliances such as washers/dryers, refrigerators, TV’s, etc. The M-471 can provide  signal attenuation going INTO the appliance (IE, when a transmitting radio causes the appliance to malfunction), or FROM the appliance (IE, the appliance itself generates RFI that is heard in radio receivers.)   AC line filters offer an inexpensive alternative to the risk and unpleasantry of dealing with many types of line problems. 

IMPORTANT:  Remember that RFI problems can manifest themselves in multiple ways, aside from transmission through the power cord; identifying the RF noise source and confirming that the noise is being transmitted through the AC power cord is important before purchase.

Morgan’s line filters are a complete package of inductive isolation,  capacitive decoupling, and interference control of both common mode and differential mode signals across a broad frequency spectrum range. Rated for a 13A 120V appliance.  Filters are constructed in a tough, single piece plastic box 4″ square and 2.5” tall,  and includes 6 foot molded line cord, fuse.  Each unit is packed with a informative owner’s manual.

NOTE:  Visit manufacturer’s website www.surgestop.com for technical specs of this filter.

Complement modern transceivers with a Morgan notch filter to lessen or reduce out of band RF energy from nearby transmitters.  A notch filter is the opposite of a bandpass filter:  Instead of allowing a band to "pass" signals and blocking everything else, a notch filter will remove the specified band and allow everything else to pass.  For example: you are operating 20m and 40m stations in close proximity.  The 20m station is getting interference from the 40m station.  A 20m bandpass filter can be used on the 20m station which blocks all out of band signals (everything other than 20m.)  But in severe cases of interference it may not be enough.  A 40m notch filter can be added to the 20m station, which will deeply block or "notch" out the 40m station entirely.  

Notch filters can be used as a standalone product or in conjunction with our bandpass filters for superior performance in an RF busy environment.  Notch filters are perfect for multi-transmitter environments such as field day, SOTA/POTA activations, or contesting.  They are particularly useful with modern direct sampling software defined radios such as the Icom IC-7300.  

Use bandpass filters anywhere that critical single band performance is required, or where nearby transmitting stations cause interference to needed communications. Excellent for multiple-operator stations and portable or field use.

Notch filters use the same compact 3″ square heavy chassis as our legacy model bandpass filters. Units are rated for 200 Watts transmitter power.  SO-239 connectors standard. Packaged with owner’s manual.  Mounting footprint 4"x3".

NOTE:  Visit manufacturer’s website www.surgestop.com for VNA plots and technical specs of these filters.