[Boatanchors] Using a SG-230 tuner on AM

[rbethman]

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
>>>>> =
>>>>>
>>>> ______________________________________________________________
>>>> 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----------------------------+
>>
>
>

-- 
+------------------------------------------------------------------+
|             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----------------------------+