K3 and Expert 1k

[Martin]

Elecrafters,
my buddy Erwin runs a SPE Expert 1K and a K3. When he transmits through
the Amp, his signal is clean on his frequency, but one can hear the
transmission as crackling noise below and above his frequency, even with
low driving power. Thats the best i can describe it. We sure want to
find out how to prevent this.
This has been a topic a while ago on this list, but i can't find it.

So is there a recipe for a K3 working together with a Expert 1k?
To ALC or Not to ALC? Max. Power IN? Any settings in the K3? Any
settings in the amp we overlooked?

Hints welcome.


--

Ohne CW ist es nur CB..

73, Martin DM4iM
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[Don Wilhelm]

Martin,

I have not yet seen a response on the reflector.  I cannot comment on
the crackling noise, but on the ALC question, the answer is NO ALC.
Although you might want to connect the ALC cable so the amplifier can
shut down the driving transceiver in case of an amplifier fault, set the
power level in the K3 so that no ALC is developed in normal operation.

Using the amplifier's ALC to control the drive from the transceiver is a
recipe for overload and distortion - no matter what claims to the
contrary might be made by the amplifier manufacturer.

The K3/K3S has a menu setting - PWR SET - that allows the power to be
set per band which can be useful when driving an amplifier.  See the
menu listing on page 58 of the K3 manual and also see the manual
External ALC setup and Per-Band Power Control on page 27.

That may or may not get rid of the noise, but is the proper way to drive
an amplifier (any amplifier).

73,
Don W3FPR



On 11/2/2017 5:42 AM, Martin wrote:
>
> So is there a recipe for a K3 working together with a Expert 1k?
> To ALC or Not to ALC? Max. Power IN? Any settings in the K3? Any
> settings in the amp we overlooked?
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