>I just completed installing the Rich Measures QSK circuit in one of my
>SB-220s and it works great. Clackity-clack absolutely gone, noise and relay
>delay no longer perceptible. Really fast, smooth VOX. VOX delay set now to
>minimum.
With headphones, it's almost like talking on the telephone.
>
>Every measurement in testing is exactly as in the Measures circuit diagram.
>
>I am now going to modify another SB-220 with this circuit. There is plenty
>of room for a circuit board for this entire circuit after the clackity clack
>is removed. Has anybody ever produced such?
>
Since the circuit is very simple and Q1 needs to be mounted against metal
to act as a heat sink, there is little advantage in a printed circuit
board. Another problem is that different types of amplifiers have
different height and width limitations.
>And to Rich - The silicone adhesive really stops or greatly dampens the
>noise. I believe the thick silicone insulation on HV test lead wire (26KV
>type) will dampen the relay noise and would be an acceptable alternative to
>the tedious copper foil fabrication and soldering for two of the
>connections. Perhaps slitting and removing the insulation from a length of
>HV test lead and applying it to the heavy wire to the HV RF section with a
>dab or so of silicone will dampen the noise also.
>
bend an "S" shape into flexible wire and vibration is greatly attenuated.
- thanks for the feedback, Bob
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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