[Boatanchors] Using a SG-230 tuner on AM

Wed Aug 12 16:29:11 EDT 2009

The issue Bob is not driving an linear, Ive been doing that since the 60's. 
I also know how to tune the TX and a modulation scope is used to get it 
perfect.

The issue is safely using the SG-230 and the only rigs I have that wont blow 
past the 200W PEP limit is the DX-60B and AF-67.

I was just curious how a SSB with carrier rig or controlled carrier can have 
the same 6dB PEP increase as equal to a 100% modulated Class C rig.

The replies so far dont calculate but Ive been too busy to dig in any 
further.

Carl
KM1H

----- Original Message ----- 
From: "rbethman" <rbethman at comcast.net>
To: <boatanchors at mailman.qth.net>
Cc: "Gary Schafer" <garyschafer at comcast.net>; "'Carl'" <km1h at jeremy.mv.com>; 
"'D C *Mac* Macdonald'" <k2gkk at hotmail.com>
Sent: Wednesday, August 12, 2009 2:39 PM
Subject: Re: [Boatanchors] Using a SG-230 tuner on AM

> Cutting through a bunch of excess verbiage.
>
> To use a screen modulated radio with a linear amplifier, I.E., a DX-60 
> into an Amp Supply LK-500ZB:
>
> Tune DX-60 with amp on standby.  DX-60 will get about 25W out.  The light 
> up amp to ON.  Rapidly, tune the Amp for max output.  Observe output to 
> see what carrier level you have with the carrier ONLY from DX-60.  Ensure 
> you have the "headroom" in the amp.
>
> A DX-60 will do around 25W itself on AM for a carrier.  Fed into Amp 
> Supply LK-500ZB, the carrier when tuned for max will be about 300 to 350W 
> carrier.
>
> Now the control for modulation is the audio level adjustment.  The DX-60 
> is on the chassis behind the panel.  The audio chain is what controls the 
> screen levels.
>
> Short and sweet!  Forget the this voltage, that voltage, calculations and 
> all that!
>
> Now what is YOUR screen modulated rig and amp Carl?
>
> Bob - N0DGN
>
> Gary Schafer wrote:
>> In a simple answer, the PEP will never be greater than full carrier power 
>> at
>> tune up.
>>
>>
> Really should be DSB with carrier.  The KWS-1 was AM using ONE Sideband.
>> With SSB with carrier AM the amplifier must be tuned for maximum PEP that 
>> is
>> expected.
>>> -----Original Message-----
>>> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
>>> bounces at mailman.qth.net] On Behalf Of Carl
>>> Sent: Wednesday, August 12, 2009 8:45 AM
>>> To: D C *Mac* Macdonald; boatanchors at mailman.qth.net
>>> Subject: Re: [Boatanchors] Using a SG-230 tuner on AM
>>>
>>> Now that the noise has died down I'll get back to the original subject.
>>>
>>> Ive not disagreed with the math, just the visible proof on my test
>>> equipment.
>>>
>>> Im now perfectly satisfied with the 4X at least with 100% plate 
>>> modulated
>>> Class C.
>>>
>>> Now for today. How about controlled carrier screen modulation where 
>>> there
>>> is
>>> no added modulator power to speak of?
>>>
>>> Or SSB with carrier?
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message -----
>>> From: "D C *Mac* Macdonald" <k2gkk at hotmail.com>
>>> To: "KM1H Carl Huether" <km1h at jeremy.mv.com>;
>>> <boatanchors at mailman.qth.net>
>>> Sent: Sunday, August 09, 2009 3:26 PM
>>> Subject: RE: [Boatanchors] Using a SG-230 tuner on AM
>>>
>>>
>>>
>>> Carl and otherson the boatanchors list:
>>>
>>> I believe the SGC-230 is rated at 125 Watts PEP.
>>>
>>> Since the Viking, DX-100, 32V-*, B&W, etc. ran
>>> close to 120 Watts carrier, 100% modulation would
>>> cause PEP output to be 400-500 Watts.
>>>
>>> I don't believe it advisable to risk running that
>>> sort of power into the SGC.
>>>
>>> I'm pretty sure most list members are aware of that
>>> fact but I believe that it bears refreshing.
>>>
>>> 73 - Mac, K2GKK/5
>>> Oklahoma City, OK
>>>
>>>
>>> ----------------------------------------
>>>
>>>> From: km1h at jeremy.mv.com
>>>> To: boatanchors at mailman.qth.net
>>>> Date: Sun, 9 Aug 2009 14:30:11 -0400
>>>> Subject: [Boatanchors] Using a SG-230 tuner on AM
>>>>
>>>> Has anyone tried running a 100W output AM rig thru one of these?
>>>>
>>>> Id like to be able to be able to run a Viking I or II thru one using a
>>>>
>>> 160
>>>
>>>> and 75M dipole in parallel for 160-20M.
>>>>
>>>> Carl
>>>> KM1H
>>>> =
>>>>
>>> ______________________________________________________________
>>> Boatanchors mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Boatanchors at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>>
>>
>>
>> ______________________________________________________________
>> Boatanchors mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Boatanchors at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>>
>
> -- 
> +------------------------------------------------------------------+
> |             AM Amateur Radio Operator    NØDGN                   | 
> +------------------------------------------------------------------+
> | Bob Bethman                \\\|///     " The absence of a danger |
> |                           \\ ~ ~ //      signal does *NOT* mean  |
> | rbethman at comcast.net      (/ @ @ /)      that everything is OK " |
> +-------------------------oOOo-(_)-oOOo----------------------------+
> 