Page 34 of HAM Radio 2009 by MFJ Enterprises, Inc.

mfj-653 hamproaudiotm speech mfj-653 articulatortm greatly improves transmit 95 speech intelligibility for super punch ship code a based on extensive speech research the mfj-653 uses optimized frequency shaping to concentrate the energy in the band of frequencies where speech rf output power with low distortion intelligibility is concentrated it also a highly effective noise gate downward removes powerful low frequencies that expansion with front panel level and delay overwhelms the important high frequencies controls smoothly removes annoying backthat carry intelligibility ground noise picked up during speech pauses you can boost the highly intelligible band the results you ll be heard and underof frequencies centered around 2 khz by up stood powerful highly intelligible speech to 16 db and gently remove the powerful low gives you a commanding presence that frequencies that have little intelligence the slices through dx clutter high-pass filters cutoffs are 1.1 khz and 500 hz you can use any transceiver and with its using a ssm-2166 broadcast industry universalmictm interface you can use speech compression ic the mfj-653 sylalmost any microphone high/low impedlabic compressor with its adjustable 15 to 1 ance dynamic and electret with the mfjcompression ratio can nearly double your 653 regardless of whether or not the mfj speecharticulatortm improves transmit speech intelligibility 149 microphone was designed for your particular transceiver microphone input jacks include a rj45 modular an 8 pin round and mfj s exclusive programmable 3.5-mm mfj s programmable 3.5 mm jack lets you use heil series mfj-393 boom-mic headphones or even an inexpensive computer boom-mic headset and provides phantom voltage when needed an adjustable preamplifier lets you even use low-level output microphones compact size 5wx13/4hx43/4d inches takes little room on your desk and small enough to use mobile where you really need it output cables to connect transceivers with 8-pin round or 8-pin modular microphone connectors are included use 12 vdc or 110 vac with optional mfj-1312d power supply have you got two radios but only one keyer one headphone set one paddle and other accessories mfj s single operator/two radio switch so2r is at your rescue save money reduce clutter ship code a so2r switches mic/ptt/keyer/soundcard for 2 radios 139 between mix radio 1 stereo or radio 2 mfj-643 95 depending on how you want the audio pre have you got two radios but only one keyer one headphone set one paddle and other accessories mfj will unclutter your operating position and save you money you only need one microphone keyer soundcard interface iambic paddle etc mfj-643 lets you operate two radios with the following accessories desktop and headset microphones keyers/keys/paddles soundcard interfaces modems etc the mfj-643 is designed for easy use just set the internal jumpers for the mfj393 professional boom-mic headphones heil series headphones a computer boommic or computer boom-mic headset you get instant led visual indication of the transmit audio path so you know which radio your audio is being sent to on receive you can instantly choose sented to your headphones the input source connector is a 3.5mm stereo jack your input source can be a dynamic or electret mic low or high impedance stereo or monaural receiver audio sound card or modem or key or keyer you have a choice of ptt functions use your microphone s ptt switch a foot or hand switch or the convenient ptt switch located on the front of the mfj-643 there are also additional inputs dual outputs for your keyer and two lines to switch an antenna between your radios key an amplifier or anything else you want to use them for use 12 vdc or 110 vac with optional mfj-1312d power supply compact 71/4wx23/4hx51/2d inches enhanced version of the mfj-643 interfaces with virtually any mic connector interface this mfj exclusive lets you use any mic with any radio internal jumpers configure any microphone to any radio mfj-644 also gives you three additional input sources 1 an 8-pin modular rj-45 input jack 2 an 8 pin round input jack and 3 mfj s own input 3.5 mm jack the 3.5 mm jack allows the user to choose audio and ptt functions from the heil series of boom-mic headsets and also provides phantom voltage on the tip for the mfj-393 boom-mic headphones or on the ring for a computer boom-mic or computer boom-mic headset compact 71/4wx23/4hx51/2d inches ship code a mfj hamproaudiotm universal so2r switch 159 mfj-644 is similar to the mfj-643 mfj-644 95 but is enhanced with the universalmictm mfj hamproaudiotm computer-controlled so2r switch permits mfj-645 to interoperate with wineqf ct na trlog and write-log its universal mictm interface lets you use any mic with any radio internal jumpers configure any microphone to any radio mfj-645 easily interfaces with the mfj-1275 and mfj-1279 sound card interfaces giving you full control over your digital modes you can choose which radio is in the digital mode or you can even operate dual digital modes and besides the normal manual ptt capabilities as those of action with computer logging and so2r programs for effortless single operator/2 radios operation mfj-645 extends capabilities of mfj644 and includes computer control -ship code a 249 universal computer intermfj-645 95 face provides seamless inter the mfj-644 when connected to the mfj1275 or mfj-1279 sound card interfaces your digital mode can also control the key line use 12 vdc or 110 vac with optional mfj-1312d power supply measures 1 11 /4wx51/2hx21/2d inches mfj hamproaudiotm 2-radio headphone selector/mixer 49 ship code a mfj-640 95 all mfj hamproaudiotm accessories are designed with the serious ham in mind the choice of components and extensive rf filtering and bypassing allow for a unit that is designed to be used in an rf environment mfj-640 combines or selects audio from two different receivers great for operating split for hf contests and dxing or cross-band for vhf/uhf satellite just connect the audio output of two receivers to the two 3.5mm audio connectors on back of the unit then plug in your stereo headphones and you are ready to go mfj-640 provides both 1/4 and 3.5mm stereo headphone jacks no need for adapters from the front panel you can select the audio output desired mix radio 1 stereo or radio 2 in the mix mode both radios are combined in both the left and right earphones and the audio mixing levels between the two radios are controllable in the stereo mode radio 1 is heard in the left ear and radio 2 is heard in the right ear compact 43/4wx21/8hx5d inches 34 mfj the world leader in ham radio accessories

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