Interesting thoughts, gentlemen. Thank you.
Fortunately, the SG-500 does provide drive attenuation when necessary, so ALC
isn't actually required. I was just wondering if anyone knew of a circuit that
addressed this issue, similar to Stefan Stefanov's (AF6SA) excellent KTI-LR
Kenwood Remote LDG Tuner Interface
<http://www.af6sa.com/projects/Kits.html#KTI-LR>.
I appreciate your sharing your knowledge with me, who was only licensed in
2012.
Best regards,
Larry
WB6BBB
On Wed, 27 Jan 2016 17:39:43 -0800, "Jim Thomson" <jim.thom@telus.net> wrote:
>Date: Mon, 25 Jan 2016 18:19:13 -0500
>From: Ron Youvan <ka4inm@gmail.com>
>To: amps <amps@contesting.com>
>Subject: Re: [Amps] SG-500 ALC Interface to Kenwood TS-480HX
>
> Larry Dighera wrote:
>
>> Given the SG-500's ALC control signal is +1 to +5 VDC, and the Kenwood
>> TS-480HX's ALC signal expects -7VDC, how have others interfaced these two
>> pieces of equipment?
>
> I don't know, but a 9 Volt battery might do it.
>
>--
> Ron KA4INM - Youvan's corollary:
> Every action results in unwanted side effects.
>
>
>## A 9 vdc battery fed across the far ends of a 50k pot. Then take the
>output, between
>wiper and positive end of pot. Then you can vary the output of the mess
>from 0-9 vdc,
>and its all negative Vdc..then feed that negative 0-9 vdc into your TS- 480
>HX ALC jack.
>Then NO alc connection from xcvr to amp.
>
>## Then you can set the PO of the TS-480HX.....if it has an adjustable PO
>to what ever the
>amp requires. Then dial up the pot till po of the amp just drops a tiny bit.
> At that point, you can
>scream all you want..and never over drive the AMP. You can also turn the PO
>on the xcvr to max,
>and tweak the pot for desired drive into the amp. Same deal, scream all u
>want, and u cant overdrive the amp.
>
>## this 2nd scenario works better, since there is no time lag in developing
>ALC voltage in the xcvr. You have already
>developed it via the 9 vdc battery and pot. The only drawback to using the
>9 vdc battery + pot is..... if you whisper into
>mic you will have reduced po from the xcvr. In normal operation it works
>superb.
>
>## an alternate method that may well work is to use a SS DC to DC
>converter. Then you could feed the +1 to +5 vdc
>from the amp.... into the input of the DC to DC converter, the output side
>will be either 0-5 vdc positive..OR 0-5 vdc
>negative. The dc to dc converter isolates the input to the output side. In
>your case, the output side will have its positive
>bonded to chassis of xcvr, with negative going to alc jack of xcvr.
>
>
>Jim VE7RF
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