[Kenwood] ALC with Kenwood TS-830S

[manualman at juno.com]

If this is for using the 830S with the Johnson Thunderbolt, the
Thunderbolt manual includes design information for building various
resistor attenuators (typically a "T"- type design)  to drop the exciter
power down to work with the amplifier. I built one years ago to work with
a Johnson Ranger exciter driving the Thunderbolt. Johnson also made two
attenuators which sometimes pop up on ebay or hamfests.

The Kenwood ALC diagram power reduction diagram, battery, variable
resistor, etc. would also work OK to power reduce SSB output but it might
be a little more difficult to adjust. Two tone audio into the mike input,
or something similar, would have to be used.

Pete, wa2cwa
www.manualman.com



> On 3/29/2021 12:07 PM, Steve H wrote:
> > Rick
> >
> > I guess I need an attenuator then. It would have to be able to 
> take 100W
> > and bring it down to 5-10w for the hf bands.
> >
> > -- 
> > Steve Hearns
> > KA2PTE
> >
> > ----- Original Message ----- From: "Rick NK7I" 
> <rick.nk7i at gmail.com>
> > To: <kenwood at mailman.qth.net>
> > Sent: Monday, March 29, 2021 2:32 PM
> > Subject: Re: [Kenwood] ALC with Kenwood TS-830S
> >
> >
> >> Steve,
> >>
> >> I haven't done this. Traditional wisdom is to NOT use the ALC to 
> >> limit the amp, that causes issues like flat topping and 
> distortion of 
> >> the audio.
> >>
> >> If you're using an audio mode, try providing less audio (less 
> drive). 
> >> Or put an attenuator pad on the amp input so it requires more 
> drive 
> >> (which must be able to safely dissipate that power).
> >>
> >> 73,
> >> Rick NK7I
> >>
> >>
> >> On 3/29/2021 11:23 AM, Steve H wrote:
> >>>
> >>> Trying out this alternative to using an attenuator
> >>> with my 830S and an older linear that only needs 5-10W to 
> excite.
> >>>
> >>> Was told to get pin 6 on the remote connector din and get a 9v 
> >>> battery with
> >>> a 225k potentiometer on it and feed the wiper as per the 
> attached
> >>> illustration.
> >>>
> >>> Thats seems to be for the 520/820s now that I notice. Turns out 
> all the
> >>> hybrids use pin 6 for the alc, but I notice they are putting the 
> gnd 
> >>> into
> >>> pin 4 on this diagram.
> >>>
> >>> https://www.mediafire.com/view/5sf9ovlmvhvkqjv/alc.jpg/file
> >>>
> >>>
> >>> I had tried this but used the chassis ground and pin 6
> >>> thinking that would work, but it does not have any effect. Pin 4 
> on 
> >>> the 830
> >>> is to the NO contact of the control relay, so I dont think this 
> will 
> >>> work.
> >>>
> >>> Has anyone used the ALC on their 830 to limit input to their 
> linear?
> >>>
> >>>
> >>>
> >>> Steve
> >>> KA2PTE