[Elecraft] [OT] High SWR on 20 and 40

djmd djmd at fuse.net
Fri Jan 15 20:41:41 EST 2010


Thanks Don. There are multiple scenarios. 

1) K2  -  BL2  -  windowline  -  dipole

2) K2  -  2' Mini-RG8  -  BL2  -  windowline  -  dipole

3) K2  -  10' RG8  -  BL2  -  windowline  -  dipole

All coax is terminated PL-259, so there are BNC-SO239 adapters at the K2 and
Balun.

Where the system starts to fail is when I go from the K2, through any length
of coax, into a 4" barrel  (entry point) , then to another short piece of
coax between the barrel and the balun. The only sort of testing I've done
through this barrel (it's going through cement backerboard) is attaching an
MFJ dummy load in place of the balun.

K2 - 10' RG8 - 4" barrel - 2' RG8 - Dummy Load

That's where I saw the 1:1 across the bands from the K2/KAT2. I suppose that
may not be a good enough test to give this part of the system a "thumbs up,"
but it's all I got at this point.  

With the system in place right now (K2 - coax - barrel - coax - balun -
antenna) here's what I'm seeing on the KAT2 with the power set to 2.0w.

80m  8.3:1
40m  9.9:1
30m  1.3:1
20m  9.9:1
17m  6.3:1
15m  2.2:1
12m  1.0:1
10m  1.0:1

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