The KAT3 tuner has one of the widest matching ranges I have ever seen from an autotuner. Only maybe twice has it not matched what I have connected to it.
I suppose I want to know if the KAT500 is a "beefed up" version of the KAT3, using the same value components and firmware algorithms.
As Eric recently explained to me, the KAT500 is based on the same design as
the ATU for the K3--only bigger! So, yes it should have much the same
spec's, which means something like a 10:1 SWR capability. Actually, Eric
noted that, provided you a somewhat closer SWR variance, like 3:1 or better,
the KAT500 will handle a good bit more than it's 500 watt specificed power
rating. How much more he didn't say exactly, but the KAT500 will very
probably work just fine on some of those 800 watt amps that are out there,
and just as well or better than various other ATU's. Mating the KAT500 with
the KPA500 is the primary objective, but they are intentionally aiming at
other amps as well--within a reasonable power range. If you think about it,
that only makes sense not to limit yourself to just your own matching amp.
I don't know how aggressive they will be about the actual spec's when those
are formally released, but Eric specifically pointed out that they wanted
this ATU to be fairly versatile.
The KAT500 is a "beefed up" version of the KAT3, using very similar value
components (in pF and uH) but larger current and voltage capacities. The
range of antenna impedances that can be matched are quite similar.
The KAT500 firmware algorithm started with the KAT3 algorithm, but the
KAT500 must also work with other transceivers and a high power amplifier, so
additional capability is required.
Significantly more memory is available for storing antenna tuner settings.
The KAT3 tuner has one of the widest matching ranges I have ever seen from
an autotuner. Only maybe twice has it not matched what I have connected to
I suppose I want to know if the KAT500 is a "beefed up" version of the KAT3,
using the same value components and firmware algorithms.
More than fair. If one reads the specs, the KAT500 will handle the load.
If one only operated though the Elecraft amp at 500 watts, the K3 amp would
not be necessary. Just reduce drive. I don't know how low it detects at
this point. That spec isn't published. If it were low enough I might order
one and put it out in the back in my remote cabinet. Just waiting for more.
From: [hidden email] [mailto:[hidden email]] On Behalf Of Matt Murphy
Sent: Thursday, March 29, 2012 4:31 PM
To: Andy Wood
Cc: [hidden email] Subject: Re: [Elecraft] FW: KAT500 vs KAT3 Matching Range
Would it be fair to assume that if the KAT3 matches a load sufficiently to
allow the transceiver to put out 100W that the KAT500 would match the same
load safely for 500W?