[Elecraft] K2 SSB Vox Mod Results...

Wed Feb 27 08:47:37 2002

Hi Steve,

I just finished the 10K resistor mod on R2/R14 SSB Board and appears to work 
much better! VOX kicks in easier now w/ the Heil ProSet...thanks so much for 
the info!

73 John K7FD, K2/586...getting ready for the ARRL SSB DX Test...

>From: "Steve Carey" <[email protected]>
>To: <[email protected]>
>Subject: K2 with Heil Pro Headset . . .
>Date: Tue, 26 Feb 2002 17:16:50 -0000
>
>Hi John,
>
>I have just modified my K2 for use with the Heil Pro Headset ( HC-4 ). With
>my K2, the Heil produces enough mV to drive the rig to full O/P . . . BUT
>not sufficient to open the VOX without shouting. I proved this by wiring up
>a new 8-pin Mic Plug with a PTT line and a Toggle switch. Once flipped into
>TX mode, I could talk in a normal voice! Oh, when I added a pre-amp, the 
>VOX
>worked fine bt the speech just broke up and sounded dreadful.
>
>Here is what to do ( recognised MOD ):
>(It's ALL on the SSB board so it's easy to take it out and do it! )
>Change R14 to 10K ( this will increase the gain of the speech amp and to 
>the
>VOX circuit )
>Change R2 to 10K ( decreases I/P to Balance Modulator )
>
>PSCH 0.4 and 1.0 is the VOX delay time after you stop talking 0.4 of a
>second ( great ) and 1 second ( to long ! )
>
>Mine sounds really nice on the headset, which I got to operate /Bike
>Mobile!!
>
>Steve/G4MJW
>
>

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