Re: [IRCA] Part 15: an explanation (and loopholes?)

["chris and anne" <tantwo@xxxxxxxxxxxxx>]

Hey Y'all.....go to QRZ.com....and fill in the call : N4ES....in the upper 
left box and click on it. Bill runs a neat 10 meter beacon that steps the 
power down from 20 wts  to 2 wts. to 200 mw to 20 mw.....you can read all 
the details on it on his QRZ page. I've heard all 4 tones here several 
times....yes, 1/50 of a watt can be heard many miles away.   73, Chris 
K4NHL  S.C.
----- Original Message ----- 
From: "Joe Miller, AB8YP" <ab8yp@xxxxxxxxx>
To: "Mailing list for the International Radio Club of America" 
<irca@xxxxxxxxxxxxxxxx>
Sent: Thursday, July 19, 2007 12:22 PM
Subject: Re: [IRCA] Part 15: an explanation (and loopholes?)


> Mr. Taylor,
>
> I agree with you. It's my understanding though that
> the 100 mw is measured at a distance of 30 meters from
> the antenna. Depending on the loss of signal strength,
> output power at the antenna can be compensated.
>
> On a side note, I know of a ham operator within
> 200-400 miles of me who took an old CB radio,
> converted it to transmit on ten meters, and uses it
> for a CW beacon with one watt of power. How far does
> the signal go? I heard it from my home....
>
> 73 de Joe (AB8YP)
>
>
> --- Charles A Taylor <MWDXer@xxxxxxx> wrote:
>
>> At 03:18 AM 7/19/2007 -0400, you wrote:
>> >If it's Part 15, it's limited to 100MW ERP from
>> each transmitter into a 3
>> >meter antenna.. otherwise it isn't legal.
>>
>>
>> Paul,
>>
>> What Part 15 says is that the D-C input into the
>> final shall not exceed
>> 100 mW*, not 100 mW ERP. Also, the total length of
>> the antenna, feedline
>> and ground connection shall not exceed 3 meters.
>>
>> * You mean mW=milliwatts. MW=megawatts!
>>
>> Effectively, that means the final is going to be
>> VERY close to the
>> antenna. Reading the "letter of the law," I see no
>> averse language
>> that prohibits a complete radial system. THAT would
>> make a BIG
>> difference in a 100 mW's reach/coverage.
>>
>> Also, since the D-C input is fixed at 100 mW, I see
>> no averse
>> language that limits the R-F input to the final to
>> any level.
>> That means, for example, if one uses a grounded-grid
>> or grounded-base
>> final, if driver feeds 50 mW into the final it will
>> also appear in the
>> output for a total of 150 mW!
>>
>> It looks legal to me.
>>
>> Our barn has a galvanized roof and years ago I took
>> the time and trouble
>> to bond the sheets together.I also put up a 10-foot
>> mast atop the center
>> of the roof.
>> But I never carried through and put a 100-mW
>> transmitter up there. I
>> may go berzerk and put the mast back up and try a
>> small BC station or
>> beacon.
>>
>>
>> >Meaning, they can synch more then one transmitter
>> together as long as none
>> >of the individual transmitters exceed 100MW ERP
>> with a 3 meter antenna
>>
>> Got that right!
>>
>> Charles
>>
>>    Charles A Taylor, WD4INP
>>
>>   Greenville, North Carolina
>>
>>
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>>
>
>
>
>
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