[Boatanchors] Using a SG-230 tuner on AM
Carl
km1h at jeremy.mv.com
Wed Aug 12 16:52:45 EDT 2009
For starters the CCS rating is 80W dead carrier.
Carl
----- Original Message -----
From: "rbethman" <rbethman at comcast.net>
To: "Carl" <km1h at jeremy.mv.com>
Cc: <boatanchors at mailman.qth.net>; "Gary Schafer" <garyschafer at comcast.net>;
"'D C *Mac* Macdonald'" <k2gkk at hotmail.com>
Sent: Wednesday, August 12, 2009 4:45 PM
Subject: Re: [Boatanchors] Using a SG-230 tuner on AM
> Carl,
>
> The DX-60 itself WILL run through the SG-230 perfectly well. The 230 can
> handle 40W continuous duty. If you amplify it - THEN it is too much for
> the tuner once again. As a normal GG amp like 2 500Zs will be a resting
> carrier above what the SG-230 will deal with.
>
> The screen modulated, especially the DX-60 with its single 6146, is NOT a
> 6dB increase in output. I've never dealt with an AF-67 so have NO comment
> there!
>
> Won't talk what I do NOT know!
>
> Okay?
>
> Bob - N0DGN
>
> Carl wrote:
>> 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
>>>>>> =
>>>>>>
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>>>>
>>>>
>>>> ______________________________________________________________
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>>>
>>> --
>>> +------------------------------------------------------------------+
>>> | 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----------------------------+
>>>
>>
>>
>
> --
> +------------------------------------------------------------------+
> | 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----------------------------+
>
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