[Elecraft] Heil Proset w/ K2

Wed May 7 10:47:00 2003

Mike very curious about your (and other's) experiences performing the KSB2 
mod as described in 'Improving the Performance of the KSB2' installing a 
2n2222 to increase the mic gain of the circuit....my SN3345 also suffers 
from low mic gain even using the Heil mic Elecraft sells so I'm considering 
the mod as well.

It sounds like you did the mod? If so, did it work per your expectations and 
are there any downsides to making these changes on the KSB2 board?

Thanks and 73....ed

>From: "Mike Rioux" <[email protected]>
>To: <[email protected]>, <[email protected]>
>Subject: RE: [Elecraft] Heil Proset w/ K2
>Date: Tue, 6 May 2003 21:29:33 -0400
>
>Ron,
>I've been using the Heil Proset with the HC-5 element for over two years
>with the K2.
>It works fine. I use the standard Kenwood 'red' mic connector. And have
>set
>the jumpers on the front panel board for the Kenwood wiring as shown in
>the
>KSB2 manual.  I did change the value of R14 on the SSB board to 10k
>once. I reversed
>that change after I installed John's (KI6WX) mods to the KSB2 module.
>The name of the
>article is 'Improving the Performance of the KSB2' (7/18/2002). It is
>available
>on both the Elecraft and LA3ZA sites.
>I later went back and modified the front panel board to supply 5V on pin
>6 of the
>mic connector and added AF out from the center lug of the AF gain
>control to pin
>5 of the mic connector. This allows me to use cheap $3 headset/boom mics
>that
>were for computer use. Quality reports have been great! The AF out on
>the mic connector allowed me to build up a cable to go directly to the
>PSK31
>interface with a level audio output and still be able to monitor the PSK
>from
>the internal speaker using the volume control.
>I also have the Heil-supplied hand mic for the K2. I modified the wiring
>of that mic
>to add in the resistor and blocking cap to enable the mic to work with
>the
>K2. I added the parts in the connector shell. Choosing pins 5 and 6 for
>5V and AF out
>mean that all of the mics and PSK gear in the shack are interchangeable
>and bad
>things won't happen (or are less likely to :) when different mics and
>interfaces
>are plugged into the K2.
>I don't claim ownership of any of the above ideas - they all came
>from this reflector or Elecraft. Great source of info!
>73, Mike
>
>Mike, W1USN

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