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Re: [TowerTalk] Fwd: Fwd: RG-149: 50 ohm/70 ohm - does it matter?

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Fwd: Fwd: RG-149: 50 ohm/70 ohm - does it matter?
From: Steve Hunt <steve@karinya.net>
Date: Mon, 16 Dec 2013 17:13:59 +0000
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
On 16/12/2013 15:34, Jim Lux wrote:
But that doesn't get back to the original question..

If I have a 75 ohm transmitter, 75 ohm coax, and a 75 ohm load, and I put a 50 ohm Bird in the middle, what does it read. I think 1:1 (or FWD = something, REV = low)



No - it will read 1.5:1

From the Bird 43 manual:

"Example - Consider using a Bird 43 to tune a 70 ohm line. If the load impedance is also 70 ohms, the wattmeter will measure a VSWR of 70/50 = 1.4"

Steve G3TXQ





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