A good basic explanation of what Bob Heil is up to with the HC-4/5 and
derivitives is on their website at
www.heilsound.com
Bottom line is that he has tailored these elements to 1) expected bandwidth
in SSB and 2) manipulated the response curves to take advantage of the voice
characteristics to enhance 'punch' or a natural sound, depending on the
element.
Then we have impedance. The older Shure's, Aststics et al are high
impedance, usually on the order of 50K or better. The exception will appear
to come with an amped mic, such as the later Astatics. Heil's stuff is low
impedance, 1K I believe, and will match better to the newer rigs - Omni V
etc. The high impedance mice are easier to get sounding 'right' with the
older rigs, the Tritons, Omni A-D etc., from what I've seen here.
IMHO, to get the best sound with any mic/rig is to use a monitor scope in
the output. This is particularly the case with the older rigs that rely on
the ALC lamp for indication. It will also be a benefit to those with a
meter; I have found the actual results to be deceiving after learning how to
use the scope and after a number of QSO's. I have an old Yaesu YO-100 that
tells me what my sigs look like, AGC action, and when it begins to clip or
distort. There are various scopes out there, including Heaths and Kenwoods,
that will accomplish the same goal. It needn't be calibrated or fancy, but
that doesn't hurt either if one wishes to get into accurate two-tone and
trap measurements, with the proper knowledge and standards to drive it.
Coupling a good bench scope is easy if this makes sense.
73,
Tom N5OZQ
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