[Boatanchors] Using a SG-230 tuner on AM

[rbethman]

Gary,

The reference cited specifically states dB.  No where is it a dBM 
table.  I am quite aware of the differences. 

I gave the specific edition, title, and date.  It is VERY specific that 
the table is based on ZERO = 0.006 Watt.

The formula for this is: [ Parenthesis denotes sub ]

N(dB) =  10 log X P(out)/P(reference)

This is what Carl just sent.

Bob N0DGN

Gary Schafer wrote:
> Ah, Bob,
>
> I think that you are looking at a DBM table where the reference 0 DBM is 1
> milliwatt. What the rest of us are talking about is the number of DB (not
> DBM) above some given power level. When using DB we can use any reference we
> wish as the starting point. If expressing in DBM then you start at 1
> milliwatt as your reference.
>
> 73
> Gary  K4FMX
>
>   
>> -----Original Message-----
>> From: boatanchors-bounces at mailman.qth.net [mailto:boatanchors-
>> bounces at mailman.qth.net] On Behalf Of rbethman
>> Sent: Monday, August 10, 2009 1:46 PM
>> To: boatanchors at mailman.qth.net
>> Cc: jfor at quik.com
>> Subject: Re: [Boatanchors] Using a SG-230 tuner on AM
>>
>> The dB table is ALREADY for power, page 651, "The Radio Handbook", 13th
>> Edition, copyright 1951.
>>
>> Again, 2X = 3dB.  The table establishes zero as 0.006 watts.
>>
>> Mac, you can't mix apples and oranges.  That is precisely what you are
>> trying to do in your statement.
>>
>> Now go back and read at least one of the Orr Handbooks.  I have 13th,
>> 16th, and either 20th or 21st Editions.
>>
>> Bob - N0DGN
>>
>> D C *Mac* Macdonald wrote:
>>     
>>> 2 X the voltage  IS  6 dB because when voltage is doubled
>>> into a constant load, the current will also be doubled.
>>>
>>> 73 - Mac, K2GKK/5
>>> (Since 30 Nov 53)
>>> Oklahoma City, OK
>>>
>>>
>>>       
>>>> Date: Mon, 10 Aug 2009 10:52:30 -0700
>>>> From: jfor at quik.com
>>>> To: km1h at jeremy.mv.com
>>>> CC: boatanchors at mailman.qth.net
>>>> Subject: Re: [Boatanchors] Using a SG-230 tuner on AM
>>>>
>>>> Look at my table from two posts ago, which you quoted below... I said
>>>> EXACTLY that.
>>>>
>>>> -John
>>>>
>>>> ===========
>>>>
>>>>
>>>>
>>>>         
>>>>> 4X is doubling twice so it is 3+3=6
>>>>>
>>>>> Carl
>>>>> KM1H
>>>>>
>>>>>
>>>>> ----- Original Message -----
>>>>> From: "rbethman" <rbethman at comcast.net>
>>>>> To: <boatanchors at mailman.qth.net>
>>>>> Cc: <jfor at quik.com>; "Gary Schafer" <garyschafer at comcast.net>
>>>>> Sent: Monday, August 10, 2009 1:37 PM
>>>>> Subject: Re: [Boatanchors] Using a SG-230 tuner on AM
>>>>>
>>>>>
>>>>>
>>>>>           
>>>>>> This will ONLY apply *IF* you read the rest of the text.
>>>>>>
>>>>>> "You must first agree where ZERO is at".
>>>>>>
>>>>>> From 13th Edition Radio Handbook. Also in Radiotron Handbook.
>>>>>>
>>>>>> In any event, 2X isn't 6dB in any table I've seen.
>>>>>>
>>>>>> Bob - N0DGN
>>>>>>
>>>>>> J. Forster wrote:
>>>>>>
>>>>>>             
>>>>>>> No:
>>>>>>>
>>>>>>> 3 dB is 2x power
>>>>>>> 6 dB is 4x power
>>>>>>> 9 dB is 8x power
>>>>>>> 10 dB is 10x power.
>>>>>>>
>>>>>>> -John
>>>>>>>
>>>>>>> ============
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>               
>>>>>>>> Carl,
>>>>>>>>
>>>>>>>> Isn't 6dB actually a power increase 10 times the original?
>>>>>>>>
>>>>>>>> My understanding that 3dB is a doubling.
>>>>>>>>
>>>>>>>>                 
>>> ______________________________________________________________
>>> 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----------------------------+
>>
>> ______________________________________________________________
>> 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----------------------------+