[Elecraft] SWR Readings:Differences

[Dick Dievendorff]

Can you use the same SWR bridge in the shack that you used at the base of
the tower so you're comparing apples to apples?  I'd take the K3 out of the
equation and figure out why your SWR differs at the base of the tower
compared to in the shack through a 75'  coax run and switch.

I'd expect the SWR to be lower in the shack. If it isn't, then I'd put a
dummy load at the base of the tower, thru the switch, and measure the SWR in
the shack of that dummy load.

Dick, K6KR


-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of
pastormg2 at verizon.net
Sent: Tuesday, September 02, 2014 5:07 PM
To: elecraft at mailman.qth.net
Subject: [Elecraft] SWR Readings:Differences

Good Evening,
This is Mark Griffin, KB3Z and I have some questions regarding the SWR
readings I get at my tower versus what I get on my K3. I will give the SWR
readings that I got at my tower for a 40 meter rotatable dipole at 55 feet.

Tower:

7000  2.2
7025  1.8
7050  1.5
7075  1.3
7100  1.0
7125  1.1
7150  1.3
7175  1.6
7200  2.0
7225  2.2

K3 Readings:

7000  3.5

7025  3.2

7050  2.9

7075  2.6

7100  2.4

7125  2.3

7150  2.4

7175  2.5

7200  2.6
7225  2.9

What would cause such a big difference. The cable run from my antenna switch
on the tower to my K3 is only an additional 75 feet. I am using RG-213
cable. Is there anyway that I can test the SWR reading that my K3 is giving
me?

Mark Griffin, KB3Z

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