[TowerTalk] Probably dumb question

[Marsh KA5M]

Let's assume by "watts out" you mean watts forward.

SWR = 1 + SqRt(Pr/Pf) / 1 - SqRt(Pr/Pf)

For 100 watts forward and 10 watts reflected:

SWR = 1 +SqRt(10/100) / 1 - SqRt(10/100) = 1 + 0.31623 / 1 - 0.31623 = 1.31623 / 0.68377 =  1.92

For 200 watts forward and 10 watts reflected:

SWR = 1 +SqRt(10/200) / 1 - SqRt(10/200) = 1 + 0.22361 / 1 - 0.22361 = 1.22361 / 0.77639 =  1.58

Marsh, KA5M


-----Original Message-----
From: TowerTalk <towertalk-bounces at contesting.com> On Behalf Of k7lxc--- via TowerTalk
Sent: Tuesday, August 14, 2018 11:19 AM
To: towertalk at contesting.com
Subject: [TowerTalk] Probably dumb question

    If there are 100 watts out and 10 watts reflected, what's the swr?
 
    If there are 200 watts out and 10 watts reflected, what's the swr?
 
    Tnx.
 
Cheers,
Steve     K7LXC 

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