[Elecraft] KATxxx Remote Tuner

[David Gilbert]

I don't think that's actually true in most cases.  For example, a load 
of 35 - j45 gives a 3:1 SWR at the load for 50 ohm coax, and the 
additional line loss at 14 MHz due to SWR over 200 feet of LMR-400 
(moderate cost) is about 0.5 dB.

In most cases with typical antennas and decent feedline, a tuner is more 
about making your rig or amplifier happy, and for that it can be in the 
shack.

Unless of course you're talking about some random piece of wire with a 
10:1 SWR, but even then the extra loss due to SWR for the 200 feet of 
LMR-400 is less than 2.5 dB at 14 MHz.  The best reason I can think of 
for a tuner in that case is to keep the RF voltage from being excessive 
at high power.  If you're obsessive about 50 ohm matched antennas I 
doubt that is the case for you, and if it was me I'd put the $1,000+ 
dollars it would probably cost for a stand alone high power remote tuner 
capable of handling a 10:1 SWR to better use on the antennas themselves.

73,
Dave   AB7E



On 4/19/2020 5:40 AM, Richard Thorne wrote:
> I’m a firm believer in 50 ohm matched antennas, but if a tuner is required it needs to be at the feed point.
>
> Rich - N5ZC