To: | <[email protected]> |
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Subject: | LF: Re: antenna calculation..help needed |
From: | "Alan Melia" <[email protected]> |
Date: | Thu, 14 Sep 2006 00:46:22 +0100 |
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Dick, You could use a quarter wave length of 75 ohm coax in series from the base, as a matching transformer....allowing for velocity factor of course Cheers de Alan G3NYK ----- Original Message ----- From: Dick <[email protected]> To: <[email protected]> Sent: 13 September 2006 18:06 Subject: LF: antenna calculation..help needed Hello all, It's off topic, but as I can't find it on the net I'll ask it here. I want to modify an old 27MHz CB antenna to an quarter wave vertical for 30m (10.14MHz) Diameter is tapering from 26 to 15mm. Question: what length should it have? I suppose 0.25 wavelength x 0.96 or so... Sofar not a big problem, but as I will use 36 radials direct on the ground, it's radiation resitance will be around 36Ohm. To match this to 50Ohm I can use a series capacitor, but what value this should be?? Who can tell me? 73 Dick, pa4vhf |
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