Amplifier soft key circuit. That makes this an ideal keying relay for older amplifiers, and can even be used with amps that are QSK compatible. Feb 7, 2019 · The ALC provides a feedback voltage that comes from the amp and adjustable via rear panel knob. Without one, you potentially run the risk of damaging your transceiver. Feb 10, 2016 · It also features a opto-isolated soft-key circuit that reduces the voltage on the keying line to 12 VDC at less than 10 mA current that is also interlocked with the soft-start. Many newer radios cannot safely key older amplifiers. Older transceivers can handle these key voltages but new transceivers made after about 1995 need an interface either between the amplifier and the radio or installed in the amplifier itself. You may not SEE any difference in the operation of your exciter or amplifier, but you will know that you have reduced the stress on the exciter’s keying circuitry. The kit also utilizes a string of 10 1N5408 diodes and a 100KΩ resistor to provide DC cutoff bias and user-adjustable idle current biasing. This switch will key amplifiers with either + or – voltages. Jan 16, 2010 · This circuit has been around for ages and is very common on glass tube grounded grid amplifier. The UAKI is a High-quality compact unit, which will interface any radio with any amplifier. . This unique product will safely key any amplifier. This completes the installation of the SK-201 Soft-Key module. In this video I describe the soft key circuit that I installed in the SB200 amplifier plus cleaning of the ceramic wafer switches. This small signal once adjusted correctly helps hold the drive level in check, it helps slow any big swing in drive level that can reduce tube life. mhrptkqz rsxv ptu bsr bnuk npvh fjhl uerlv tmrzui gzuunj