[Elecraft] dBi dBd correction

[Guy, K2AV]

ARRL ain't the FCC.  And the ARRL's opinion is no mitigation whatsoever if I get an FCC pink slip. The reg is the reg, and it's a strange brew for the FCC, where ERP normally has nothing to do with dBd.

73, Guy.

----- Original Message ----- 
From: Augie Hansen (via Nabble) 
To: Guy, K2AV 
Sent: Thursday, May 07, 2009 5:14 PM
Subject: Re: [Elecraft] dBi dBd correction


Guy, K2AV wrote: 

> The way the regulation reads, hams are being told they can put 50 watts PEP 
> on an antenna, up to the gain of a dipole, and call that 50 watts ERP. 
> Higher gain must be referenced to the dipole and the 50 watts reduced 
> accordingly. 
> 
> For mobile stations there is no mention of the idea that a LESSER antenna 
> may have the 50 watts increased. 100 watts appears to be in excess of 
> regulation.  Stated another way, 50 watts max regardless, unless the antenna 
> has more gain than a dipole in which case power must be reduced by a factor 
> representing the gain of that antenna over a dipole. 
>   

Where did you get that interpretation? The ARRL Q&A, based on the FCC 
rules, says the following: 

<quote> 
The "best" antenna configurations are those with a proven track record 
on the lower bands, keeping in mind that using a loop or an array of 
some kind will require you to "do the math" to ensure you are not 
radiating more than 50 W ERP /in any direction/. The math is fairly 
straightforward. You must reduce your power by the number of decibels 
your antenna gain exceeds 0 dBd (0 dB relative to a half-wave dipole). 
Conversely, you can increase your transmitter power if your antenna 
exhibits loss compared to a dipole. Be prepared to document these 
situations in your station records, however. 
<endquote> 

Gus Hansen 
KB0YH 

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