[Elecraft] Set up of Heil ProSet K2 Headset assembly

[Ray Spreadbury]

Well, problem finally identified!!

I borrowed an Elecraft Heil ProSet & adaptor lead from a local HAM. It
worked fine with my K2 rig & my own headset (microphone) still didn't work.
I tested my adaptor lead with his headset & found that it was fine, so the
problem must be either the plug, the lead or the microphone itself - all
part of the ProSet.
Thanks Don for your help in identifying the problem. It also gave me the
incentive to open up the K2 to reconfigure the jumpers etc
73
Ray, G3XLG

-----Original Message-----
From: Ray Spreadbury [mailto:ray2.s at btinternet.com] 
Sent: 05 November 2011 17:34
To: 'don at w3fpr.com'
Cc: 'elecraft at mailman.qth.net'
Subject: RE: [Elecraft] Set up of Heil ProSet K2 Headset assembly

Hi Don

I can confirm the following points -It is an Elecraft ProSet which I bought
direct from Elecraft, all pins on the configuration header have a jumper
straight across, the 5.6K resister is soldered across pins 1 & 6.

With the microphone not connected, 5.08 volts is present at Pin 1 & 6, (and
as it happens, also 5.66v on pin2, and 4.99v on pins 3,4 & 5) & pins 7 & 8
have zero ohms to earth.

The ProSet microphone did not work with my computer soundcard but my
computer microphone (which works OK with the soundcard) plugged into the
adaptor, did not produce audio in the K2 either!

The only thing I can think of now is to try & borrow an Elecraft ProSet from
a nearby friend & see if that works in my K2.

Any other ideas please?
73, Ray G3XLG

-----Original Message-----
From: Don Wilhelm [mailto:w3fpr at embarqmail.com] 
Sent: 05 November 2011 12:30
To: Ray Spreadbury
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Set up of Heil ProSet K2 Headset assembly

Ray,

It sounds like you did everything right.  Sorry to hear of your 
disappointments.
Do you have a computer soundcard that you know works with a computer 
microphone?
If so, plug the Proset K2/3 mic into that soundcard - it should work.
To check the adapter, plug a computer mic into the Proset adapter - it 
should produce audio in the K2.

Just to double-check your installation - all pins on the microphone 
configuration header should have a jumper straight across, and the 5.6k 
resistor should connect between mic jack pins 1 and 6.
With the microphone not connected, check for the presence of 5 volts at 
pin 1 of the mic jack.  Also check for zero ohms to ground at pins 7 and 8.

73,
Don W3FPR

On 11/5/2011 7:33 AM, Ray Spreadbury wrote:
> I then re-fitted the boards and reset SSBA = 1, SSBC =2, POWER = 5 watts&
> tested the rig with both PTT&  VOX. I found:-
> Receiving, everything working OK with either the LS or the ProSet
headphones
> CW everything working OK
> PTT switch appears to work OK, VOX apparently not working&  got no audio
> output from the microphone with either VOX or the PTT. I.e. there was no
> movement of the K2's power display.
>
> Having re-checked the wiring on the mic. socket&  the 5.6k resistor, I
> suspect the Heil condenser mic is not working - how can I check it or are
> there other things I should look at?
>