[Elecraft] KAT500 question: using the KAT500 with multiple transceivers using a coax switch

[Jack Brindle]

No, but it does respond to frequency changes from the K3 which may provide some strange results. If the K3 is on and you spin the big knob while using the KWM2, the KAT will respond to the K3’s QSY. If you change bands on the K3, BOTH the KAT and the KPA will also change bands. And (most strangely), if you power off the K3, shortly the KPA will switch to 60 meters. The latter occurs because the K3 pulls the band lines up to internal Vcc (0V when power is off), which is the combination for 60 meters.

In other words, leaving the aux cable connected from the K3 to the KAT and KPA may have some unintended consequences.

The best description for connecting multiple transceivers to the KPA500/KAT500 combo is in Fred Cady’s book “The Elecraft KPA500 Amplifier and KAT500 Tuner". You might want to refer to it when setting this up.

73!
Jack, W6FB


> On Jun 1, 2019, at 9:18 AM, Nr4c <nr4c at widomaker.com> wrote:
> 
> The KAT500 has no clue what provides the RF when sensing the Freq. 
> 
> Sent from my iPhone
> ...nr4c. bill
> 
> 
>> On Jun 1, 2019, at 11:18 AM, Bob McGraw K4TAX <rmcgraw at blomand.net> wrote:
>> 
>> The KAT500 will sense the RF and apply the previously stored matching elements for the frequency.
>> 
>> 73
>> 
>> Bob, K4TAX
>> 
>> 
>>> On 6/1/2019 8:37 AM, Michael Gillen via Elecraft wrote:
>>> Greetings all and thank you for a great list with lots of great information!
>>> 
>>> Help me understand something on the KAT500. I have the Elecraft “Dream” setup as I think it is called with the K3s, KAT500, KPA500, and P3. I love it.
>>> 
>>> I have trained the KAT500 according to instructions.
>>> 
>>> My question is, now that the KAT500 is trained, can I plug in any source (transceiver) and the tuning will be remembered? That is, it really doesn’t matter what the source is, the KAT500 doesn’t know or care and the source device will get the benefit of the KAT500?
>>> 
>>> What I want to do is take the cable that goes from my KPA500, run it through an Alpha Delta 4B coax switch, then to the KAT500. Another connection to the coax switch will come from a Collins KWM-2 I recently purchased. I want the KWM-2 to get the benefits of the KAT500 tuner. So I just change the switch to decide which transceiver is connected to the KAT500.
>>> 
>>> Sound correct? If not, suggestions?
>>> 
>>> Thanks,
>>> Michael
>>> KK6RWK
>>> 
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