[Amps] SG-500 ALC Interface to Kenwood TS-480HX

[Jim W7RY]

Why not just adjust the power output control on the front of the radio? Or 
does the radio have ALC overshoot.. I don’t the the TS-480 has this 
problem...

This isn't rocket surgery!

73
Jim W7RY


-----Original Message----- 
From: Jim Thomson
Sent: Wednesday, January 27, 2016 5:39 PM
To: amps at contesting.com
Subject: [Amps] SG-500 ALC Interface to Kenwood TS-480HX

Date: Mon, 25 Jan 2016 18:19:13 -0500
From: Ron Youvan <ka4inm at gmail.com>
To: amps <amps at 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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