[Elecraft] dBd vs dBi

Mon Oct 21 00:40:01 2002

How much will that gadget lover in you be loving his gadgets when you have
to climb the tower to fix that gadget?

I dunno.. maybe it's just me but I just have to think all that
microprocessor controlled, mechanical sprocket, perforated copper strip
stuff is trouble just waiting to happen. Times 3 in this case ;)

Mike - AD5IU

----- Original Message -----
From: <[email protected]>
To: <[email protected]>
Sent: Sunday, October 20, 2002 11:06 PM
Subject: Re: [Elecraft] dBd vs dBi

>
>
> OK.  My brain is fairly fried right now.  I've managed to get my get
> "end of summer" cold in record time this year and am in a cold-medicine
> fog right now so, here are the two antennas I'm comparing:
>
> Antenna Gain F/B
> -------------------------------------------------------------
> SteppIR 3-element Yagi 8.8dBi 20-50dB
> Average in
> freespace
>
>
> Force 12 XR-5 4.2-4.6dBd 14-20dB
> compared to
> full-sized
> dipole at
> same height
>
>
>
> Force 12 XR-5 SteppIR 2-element Yagi
> --------------------------------------------------------------
> Boom Length 18' 16'
> Turning Radius 20.2' 19.7'
> Longest Element 36.5' 36'
> Freq Coverage 20, 17, 15, 12, 10 20-6 continious
> Windload 8.5 sq ft 6.1 sq ft
> Survival 100 Mph 100 Mph
> Weight 57 lbs 42 lbs
> Power > 5KW 2KW
> Elements 10 (2 per band) 3
>
>
>
> If I understand correctly, the SteppIR wins here but, I'm not positive.
> I realize that we're comparing a 3-el (per band) Yagi vs a 2-el per
> band.  I am just trying to compare the SteppIR against an antenna that a
> friend has so I can decide what to put up.  The "gadget lover" in me is
> leaning towards the SteppIR but, I don't want to give up performance for
> gadget appeal.
>
>
> 73 de John - KC4KGU
> K2/100 #2490
>
>
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