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Mystified with KPA 100 4 MHz audible tone

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Chuck Gehring

Mystified with KPA 100 4 MHz audible tone

The KPA 100 manual points out during the receiver test
"The signal from the KPA100's 4-MHz crystal oscillator (X2)
may be audible at the high end of the 80-meter band. If this is the case,
you can move it to a point just above 4 MHz using trimmer C27. The
signal from the 4-MHz oscillator on the K2 Control board may be
much stronger. Rotate C27 slightly to identify the KPA100 signal."
Well I verified that I can in fact hear the two identical and separate tones by adjusting the trimmer C27 in the KPA 100. I am just not sure what the intent of the adjustment is other than to verify the two sources for the audio tone on 80 meters. What am I doing when I adjust C27 to move to tone above the 4 MHz region?

73 KI4DGH
Chuck G.

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wayne burdick

Re: Mystified with KPA 100 4 MHz audible tone

Administrator

On Feb 14, 2005, at 12:33 PM, <[hidden email]> wrote:

> I verified that I can in fact hear the two identical and separate
> tones by adjusting the trimmer C27 in the KPA 100. I am just not sure
> what the intent of the adjustment is other than to verify the two
> sources for the audio tone on 80 meters. What am I doing when I
> adjust C27 to move to tone above the 4 MHz region?
>
> 73 KI4DGH
> Chuck G.

Hi Chuck,

The adjustment is provided just to ensure that the KPA100's oscillator
doesn't fall below 4000 kHz. If it did, it could conceivably interfere
with on-air signals. You can use C27 to position it slightly above 4000
kHz if necessary.

The K2 itself also has a 4000 kHz oscillator, which gets adjusted to
exactly 4000 kHz as part of the alignment. This will not interfere with
LSB signals at or below the band edge.

73,
Wayne
N6KR

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