[Elecraft] KAT500: Tuning on 6m

[Jim Brown]

On 7/16/2013 7:18 AM, Ignacy wrote:
> Many tuners add SWR even in bypass because the path through is not 50 Ohm.

Actually, the fundamental cause is that those tuners use the chassis as 
the signal return, which adds inductance to the path. The switching 
relays also add inductance. A proper path would be all coax (or another 
form of transmission line).  This doesn't matter much at HF, but it 
begins to be significant at 6M.

I've measured the KAT500 with a VNA. I don't recall numbers, but the SWR 
is VERY low at 50 MHz. While adding the capacitor you mention certainly 
works, there's no need to do this with the KAT500.

73, Jim K9YC