这几天在7050,14270听ham友反映我的qso发尖，是动圈话米选择不对？还是确有调整不对？
求教下~共同学习。
kenwood md-90台咪
heil bm-10-4【hc-4 dx发声元件】
the heil hc-4 element has been designed for serious dxers. it places a +10 db rise
at 2,000 hz, which is right in the middle of the human speech range. the result is
not a pretty sound, but it cuts through. the frequency response is 600 hz - 8 khz.
the hc-5 key element is the pick for everyday articulate speech audio anywhere
you need good, full range, articulation. a +6 db rise at 2,000 hz (frequency right
in the middle of the human voice pattern) brings great articulation to your signal.
the frequency response is 300 hz - 8 khz.
exclusively for the icom, heil sound has created the ic series condenser
elements. working with icom america this has been made to eliminate the low
gain audio of the icom. this element must be paired with the heil ad-1 ic
adapter, which is included with the pro-set ic. the adapter has no internal d.c.
blocking capacitor so power is applied to the ‘ic’ condenser. the frequency
response is 35 hz - 12 khz.
hc-6 element.. designed for commercial broadcast applications, the -3db points are fixed at
100 hz and 12 khz with sensitivity of -57 db at 600 ohms output impedance (centered at 1
khz.)
the speakers in the pro-set series are 200 ohms and -3 db point at 8 khz. this
reduces the hiss and noise of amateur radio receivers. the pro-set exhibits
medium efficiency and will require 4 to 5 db more drive than entertainment style
headphones, but most transceivers have no problem driving these headphones
with the af gain set at about 2 o’clock.
