[Elecraft] HEIL PROSET 7 AND K2

[Don Wilhelm]

Paul,

There are two models of that microphone - so like all Heil mics, one 
must be specific about the exact model (and that makes the answer NOT 
quick).

If you have the Pro7iC model, there is no doubt in my mind that it will 
work if you plug the microphone configuration header with the 5.6k bias 
resistor.  When you used it with the K3S, did you have to turn bias on? 
If so, it must be the Pro7iC.  If it works without bias, then it is the 
dynamic HC-7 mic element.

I do not know about the normal HC-7 dynamic mic that Heil offers, but I 
do have some experience with the HC-6 element which has very low output. 
  I doubt it will drive the K2 sufficiently without the use of a mic preamp.

If you have the Heil Pro7iC, then plug all pins of the K2 microphone 
configuration header straight across (Elecraft configuration) and solder 
a 5.6k resistor between pins 6 and 1 of the microphone jack to provide 
the bias.

If you want to try the dynamic HC-7 element, leave the bias resistor off 
- but I strongly recommend that you test it well before your trip to 
determine if the element has sufficient output for use with the K2.

I have no idea what microphone pinout your K2 is currently configured 
for.  To find out for certain, remove the front panel board and check 
the plugging (wiring) of the microphone configuration header against the 
various microphones that are listed in the KSB2 manual (download it if 
you do not have one.
That should be obvious to you if you built the K2 and KSB2 option, but 
if you did not, check it out, not all K2s are wired for the same 
microphone - the K2 mic pinout can be wired for many different mics.

73,
Don W3FPR

73,
Don W3FPR

On 12/25/2016 11:24 PM, Paul W. Van Dyke wrote:
> A QUICK QUESTION ..
>
> I have a Heil Proset 7 that will work with my K3s (delivery pending)
>
> But leave for a 3 week trip to Hawaii and intend on taking the K2 as I might
> need a few more watts for the trip than the KX3 has.
> Yes, I have a KXPA100, but it is logistics..
> Has anyone used the Proset 7 with a K2??  Pointers?