[Elecraft] Heil Proset Ic with K2

[Soaring Eagles]

Thanks again Don. The resistor and Icom pinout seems to be working fine.

BTW, I have tried to talk with Heil, but my emails have gone unanswered and 
thought maybe someone else on the list had already done this. Since that 
doesn't seem to be the case, I've now done it successfully and maybe can 
help someone else if this question comes up again. This list is 
invaluable.......great, accurate technical knowledge at the level desired!

73,

Jim, WD9HBC
K2 #5757
KX1 #1517


At 03:26 PM 2/6/2007, you wrote:
>Jim,
>
>Since you are asking about the internal makings and workings of the Heil
>mic, you may get a better answer from Heil.  The real answer has many
>considerations, see below:
>
>What I know of it, the Proset-iC from Heil uses an electret element - and
>that alone says there is a preamp inside (it is a part of every electret
>element).  So, yes, the element needs a voltage.  In many mics, that
>requires a resistor from the 5 (or 8) volt supply to the AF line of the mic
>element, but there are others that require the 5 volts be applied to a
>separate wire at the mic jack - this is the scheme used in the Ten-Tec
>electret mics.
>
>I do know the Heil Proset-iC works with a resistor from +5 volts to the AF
>pin (mic jack pin 2 to pin 1), but for the specifics, you need to ask the
>mic manufacturer about the construction of the mic that you are using, and
>in the case of Heil mics used with adapters, that information should include
>both the mic wiring and  the adapter wiring combined - there are several
>possibilities and valid combinations - only the mic manufacturer has the
>correct answers.
>
>Yes, I realize that most questions of this nature directed to the accessory
>manufacturer yield only 'how to hook it up' info' baed on th estandard
>wiring for a specific transceiver, but that leaves the user with a
>non-conventional application (such as connecting the mic to a soundcard
>interface) with a lot of remaining questions about what mic lines should be
>powered and from what point = such an interface box places just another item
>to be considered in the overall 'correct wiring' scheme.  I believe
>definition of what signal is on each wire should be included with every
>microphone or any other piece of equipment.
>
>73,
>Don W3FPR