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I was under the impression that a sort of standard existed for ALC control
voltages. Usually a negative going output form the linear is used to
reduce the drive from the exciter. I seem to remember that most rigs need
about -6V to -9V to fully back off the drive. Or have things changed ?
John ZS5JF
----------
> From: km1h@juno.com
> To: amps@contesting.com
> Subject: Re: [AMPS] ALC from SB-200 reduces FT-900 power on CW
To: <amps@contesting.com>
> Date: Thursday, September 24, 1998 12:58 AM
>
>
>
> On Wed, 23 Sep 1998 14:32:06 -0700 (PDT) david wintheiser
> <w0opw@yahoo.com> writes:
> >
> >I cranked up my old SB-200 with the Yaesu FT-900 driver
> >and discovered that the FT-900 power was reduced to 50 watts. This
> >was on CW !!. Removing the ALC line brought the drive power back up
> >to 100 watts.
>
> And leave it off. That ALC circuit was designed for tube exciters and is
> not compatible with the SS gear. Anyway your 990 has a real good
> internal ALC and it should keep the SB-200 from overdrive problems.
> Just be sure to load the 200 up to full output with 100W (700-800W with
> good tubes) and then use the ALC control on the 990 to keep the 200 voice
> peaks to about 60% of key down.
>
>
> > Does anyone have experience with this anomoly on SB-200's ??
> > Rich, if your monitoring this, I bought 2 of your kits for 572b's
> >this spring but can't remember what you
> >recommend for Cathode swamp resitors instead of ALC.
>
>
> Dont bother; you wasted a few bucks......a 990 can not hurt a SB200. The
> only "if" I am aware of is with some Svetlana tubes which tend to be
> rather squirrely in any amp......particularly a FL-2100.
>
> 73 Carl KM1H
> Amplifier Repair and 6M Conversions Our Speciality ( SB200 and 220 series
> in particular). Ask for a free flyer.
>
> >
> >
> >
> >
> >_________________________________________________________
> >DO YOU YAHOO!?
> >Get your free @yahoo.com address at http://mail.yahoo.com
> >
> >
> >--
> >FAQ on WWW: http://www.contesting.com/ampfaq.html
> >Submissions: amps@contesting.com
> >Administrative requests: amps-REQUEST@contesting.com
> >Problems: owner-amps@contesting.com
> >Search: http://www.contesting.com/km9p/search.htm
> >
> >
>
> _____________________________________________________________________
> You don't need to buy Internet access to use free Internet e-mail.
> Get completely free e-mail from Juno at http://www.juno.com
> Or call Juno at (800) 654-JUNO [654-5866]
>
> --
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<html><head></head><BODY bgcolor=3D"#FFFFFF"><p><font size=3D2 =
color=3D"#000000" face=3D"Arial">I was under the impression that a sort =
of standard existed for ALC control voltages. Usually a negative =
going output form the linear is used to reduce the drive from the =
exciter. I seem to remember that most rigs need about -6V to -9V =
to fully back off the drive. Or have things changed =
?<br><br>John	ZS5JF<br><br>----------<br>> From: <font =
color=3D"#0000FF"><u>km1h@juno.com</u><font color=3D"#000000"><br>> =
To: <font color=3D"#0000FF"><u>amps@contesting.com</u><font =
color=3D"#000000"><br>> Subject: Re: [AMPS] ALC from SB-200 reduces =
To: <amps@contesting.com>
FT-900 power on CW<br>> Date: Thursday, September 24, 1998 12:58 =
AM<br>> <br>> <br>> <br>> On Wed, 23 Sep 1998 14:32:06 -0700 =
(PDT) david wintheiser<br>> <<font =
color=3D"#0000FF"><u>w0opw@yahoo.com</u><font color=3D"#000000">> =
writes:<br>> ><br>> >I cranked up my old SB-200 with the =
Yaesu FT-900 driver <br>> >and discovered that the FT-900 power =
was reduced to 50 watts. This<br>> >was on CW !!. =
Removing the ALC line brought the drive power back up<br>> =
>to 100 watts.<br>> <br>> And leave it off. That ALC circuit =
was designed for tube exciters and is<br>> not compatible with the SS =
gear. Anyway your 990 has a real good<br>> internal ALC and it =
should keep the SB-200 from overdrive problems. <br>> Just be sure to =
load the 200 up to full output with 100W (700-800W with<br>> good =
tubes) and then use the ALC control on the 990 to keep the 200 =
voice<br>> peaks to about 60% of key down.<br>> <br>> <br>> =
> Does anyone have experience with this anomoly on SB-200's =
??<br>> > Rich, if your monitoring this, I bought 2 of your =
kits for 572b's<br>> >this spring but can't remember what you =
<br>> >recommend for Cathode swamp resitors instead of =
ALC.<br>> <br>> <br>> Dont bother; you wasted a few =
bucks......a 990 can not hurt a SB200. The<br>> only "if" I =
am aware of is with some Svetlana tubes which tend to be<br>> rather =
squirrely in any amp......particularly a FL-2100.<br>> <br>> 73 =
Carl KM1H<br>> Amplifier Repair and 6M Conversions =
Our Speciality ( SB200 and 220 series<br>> in particular). Ask for a =
free flyer.<br>> <br>> ><br>> ><br>> ><br>> =
><br>> =
>_________________________________________________________<br>> =
>DO YOU YAHOO!?<br>> >Get your free @yahoo.com address at <font =
color=3D"#0000FF"><u>http://mail.yahoo.com</u><font =
color=3D"#000000"><br>> ><br>> ><br>> >--<br>> =
>FAQ on WWW: =
&=
nbsp; <font =
color=3D"#0000FF"><u>http://www.contesting.com/ampfaq.html</u><font =
color=3D"#000000"><br>> >Submissions: =
&=
nbsp;<font color=3D"#0000FF"><u>amps@contesting.com</u><font =
color=3D"#000000"><br>> >Administrative requests: <font =
color=3D"#0000FF"><u>amps-REQUEST@contesting.com</u><font =
color=3D"#000000"><br>> >Problems: =
&=
nbsp; <font =
color=3D"#0000FF"><u>owner-amps@contesting.com</u><font =
color=3D"#000000"><br>> >Search: =
&=
nbsp; <font =
color=3D"#0000FF"><u>http://www.contesting.com/km9p/search.htm</u><font =
color=3D"#000000"><br>> ><br>> ><br>> <br>> =
_____________________________________________________________________<br>=
> You don't need to buy Internet access to use free Internet =
e-mail.<br>> Get completely free e-mail from Juno at <font =
color=3D"#0000FF"><u>http://www.juno.com</u><font =
color=3D"#000000"><br>> Or call Juno at (800) 654-JUNO =
[654-5866]<br>> <br>> --<br>> FAQ on WWW: =
&=
nbsp; <font =
color=3D"#0000FF"><u>http://www.contesting.com/ampfaq.html</u><font =
color=3D"#000000"><br>> Submissions: =
&=
nbsp;<font color=3D"#0000FF"><u>amps@contesting.com</u><font =
color=3D"#000000"><br>> Administrative requests: <font =
color=3D"#0000FF"><u>amps-REQUEST@contesting.com</u><font =
color=3D"#000000"><br>> Problems: =
&=
nbsp; <font =
color=3D"#0000FF"><u>owner-amps@contesting.com</u><font =
color=3D"#000000"><br>> Search: =
&=
nbsp; <font =
color=3D"#0000FF"><u>http://www.contesting.com/km9p/search.htm</u><font =
color=3D"#000000"></p>
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ont></font></font></font></font></font></font></font></font></font></font=
></font></font></font></font></font></font></font></font></font></font></=
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