[TowerTalk] Fwd: Dbi vs DBd

[Roger (K8RI)]

hanslg at aol.com wrote:
> Both were used. Many times a manufacturer used the dBi without telling 
> as the numbers looked better. To make figures looking even better the 
> numbers were also many times "padded".
>
> I, many times, saw figures that just didn't make sense such as a dipole 
> with some extra coils on stating "8 dB gain". :-)
>
> I would take any information about antenna gain from the 50-s with a 
> grain of salt.
>   
50's, 60's and 70's, with maybe a few 80's thrown in.<:-))  That was why 
QST quit advertising gain for antennas. Even in the real, honest world 
gain is difficult to get real figures except on a test range and even 
then getting the same figures on an average installation is unlikely.

73

Roger (K8RI)
> Hans - N2JFS
>
>
> -----Original Message-----
> From: Andy <ai.egrps at gmail.com>
> To: towertalk at contesting.com
> Sent: Tue, Nov 3, 2009 12:32 pm
> Subject: Re: [TowerTalk] Dbi vs DBd
>
>
>   
>> I am trying to find out which of the two measurement references were 
>>     
> used on
> antennas originating in the late 50's. Say 1959. I know
>   
>> in the past one or the other was used, I just dont remember which one.
>>     
>
> This is just my opinion, mind you ...
>
> But I would guess that both may have been used back then.
>
> Measurement accuracy was not so good in the 1950s that things were
> that precise anyway.
>
> Andy
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