Page 93 of HAM Radio 2009 by MFJ Enterprises, Inc.

protects expensive radio from damage by keying line transients and steady state current and voltages amplifiers can damage radios if the amplifier has too much relay control voltage voltage spikes or excessive current on the relay control line such damage often appears as stuck or sticky transmit relays in exciters or shorted transistors on transmit control lines in most cases where the radio is damaged the system transmits normally but the external amplifier stays locked in a transmit mode this prevents receive signals from coming through the amplifier with normal levels whenever the amplifier is in the on or operate position the arb-704 has many electrical advantages over conventional relay buffer systems the arb-704 has no moving parts switches almost instantaneously it is noiseless has very long life and will not develop dirty contacts it operates with negative ac or positive amplifier relay control lines it works with any relay voltage ac positive or negative up to 200 peak volts and any relay current up to 300 ma the arb-704 is fully compatible with conventional amplifier relay systems it is especially suited for buffering vacuum relay qsk amplifiers since the arb-704 does your amplifier last longer and prevent ameritron amplifier-to-transceiver interface why you need the arb-704 transceiv 95 almost anythe need er without of the plug-and-play arb-704i2 for ic-706 series radios pre-wired cable the arb-704 includes pnp-13d advanced interface is compatible with all common radios and amplifiers even though radios and amplifiers do not have standardized voltages accessory plugs or wiring it s designed to work with any amplifier/radio combination the input is designed to be compatible with any transmitter or transceiver and the output is compatible with ac control lines or dc positive or negative amplifier control lines having up to 200 volts peak open circuit voltage and 300 ma of operating current arb-704 the arb-704 interface buffer will work with not affect attack or release times in a deleterious manner the arb-704 operates with transmitters or transceivers that pull amplifier control lines to ground or output a wide range of positive or negative control voltages the transmitter only switches currents under 0.35 milliamperes and very low voltages when using the arb-704 measures a super compact 41/4wx13/4hx23/4d inches 59 plug-and-play cables cables are $17.95 each model pnp-8d pnp-8m pnp-35 pnp-5m pnp-7d pnp-13d pnp-7dk pnp-7dk2 pnp-8mk pnp-5d pnp-8di pnp-7di transceivers ft-1000/2000 mp 900,767gx,920,990,747gx ft-890 840 817 857 897 ft450 950 900 ft-100 d ft-847 ts-440 690 450 180 140 950 130 870 2000 50 120 530 430 830 850 940 570 all models of the ic-706 series 718 7000 ts-930 serial numbers lower than 309 ts-520 a plug-and-play cable is not ts-480 needed if your radio is not listed ft-980 icom acc jack icom acc 2 jack arb-704 is supplied with the following 1 one power connector cord and plug with red wire 12 volts and black wire negative and ground 2 three phono rca cord with connectors on each end these cables are for relay alc and amplifier control lines won t be able to switch fast enough unlike noisy mechanical vacuum relays the qsk-5 is extremely quiet there s no relay chatter keeping you from enjoying qsk you won t have to pay for qsk again if you buy another amplifier unplug the qsk-5 and use it with your new amp handles 2500 watts pep and 2000 watts cw in normal amateur service when swr is below 1.5:1 handles 750 watts on continuous carrier modes such as rtty sstv and fm optional cooling fan cf5 $39.95 allows sustained operation at 1500 watts in any mode use with positive voltage keying up to +25 volts 6dx4hx91/2w internal qsk available for the following ameritron models al-80b al1500 al-1200 al-82 al-800 and al800h contact ameritron for installation details on the qsk-5pc internal switch ameritron qsk-5 high power transmit/receive switch suggested retail 35995 tvi rfi and key clicks ameritron s exclusive qsk-5 this self-contained ameritron qsk-5 transmit/receive switch uses electronic pin diode switching to give you lightning fast qsk operation from nearly any hf linear amplifier it lets you use your linear amplifier for high power qsk cw for packet amtor and any mode requiring extremely fast switching between transmit and receive installation is simple all you do is plug in a few cables to start enjoying qsk there s no complicated internal wiring the wworld s most advanced qsk switch has new technology that ll make ampsavertm available in qsk-5pc completely turns off your power amplifier tube current between dots dashes and words this new qsk technology gets rid of unwanted power dissipation that causes damaging heat your expensive amplifier runs cooler so every component in your amplifier lasts longer our exclusive sureswitchtm handshaking prevents hot switching rf power prevents tvi rfi key clicks and possible damage to your amp the qsk-5 is six times faster than a typical mechanical vacuum relay qsk switch that can just barely keep up with qsk transceivers as transceivers get faster and better mechanical switching just tune-up your linear amplifier perfectly without overheating tube damage power supply stress arc over atp-100 your linear amplifier perfectly for full power output and best linearity it protects your expensive amplifier from overheating tube damage power supply stress and arc-over during tune-up it prevents premature failure and costly component replacements ameritron s innovative pulse tuning technology lets you tune your amplifier at full peak output power for best linearity it keeps average power to a low safe level to prevent overheating and power supply tm suggested saver lets you safely tune up retail 69 95 amplifier the atp-100 stress why can t i just tune up at low power to reduce overheating and component stress you ask yourself well you can but if you don t re-tune at high power which causes overheating you can create severe splatter and abuse your tube grids because of excessive grid current if your linear uses tubes that are easily damaged by normal tune-up the atp-100 could extend tube life sniff-out rfi or tvi caused by rusty guy wires rain gutters clotheslines and others by generating full peak power without amplifier damage also use to evaluate wattmeters and qsk systems set and forget internal trimpots let you tailor duty cycle and pulse rate precisely for your rig and amplifier plugs into your rig s cw key jack simply press pulse tune button and tune your amplifier normally for maximum power output locking pulse tune and momentary carrier tune buttons fully shielded all metal case 31/4wx11/4hx4d inches uses 9 volt battery order atp-100 $69.95 atp-102 $79.95 deluxe version has duty cycle and pulse rate controls on front panel for easy performance testing of wattmeters qsk systems and other equipment 12 http www.ameritron.com

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