[Elecraft] DC placement

[Jack Brindle]

It depends on what you want to measure. If you want to see the match the KAT500 gives you (should be very good when tuned), then put it between the KPA500 and the KAT500.
On the other hand, if you want to see what the antenna itself is showing, then add the sensor on the output port of the KAT500 to the antenna. Remember, the W2 only can have
two sensors attached, and the KAT500 can switch three antennas, so you need to choose how many antennas you wish to monitor and have that many (again, max of two)
sensors connected to the W2.

I generally like to monitor the antennas, so my W2 sensors are connected between the KAt500 and the antennas. I also have another sensor connected between the KPA500 and the KAT500,
but this one is connected to my P3 so I can view the output waveform as well as monitor transmitted power. This one normally shows a great SWR, although at times I will switch the KAT500
to bypass mode so I can take a look at the real antenna match (and appreciate the work of the KAT500).

Hope this helps - If you have any W2 questions I’ll try to answer them.

73,

Jack Brindle, W6FB
Elecraft Engineering


> 
> On Mar 23, 2017, at 9:21 PM, Lane <software.research.development at gmail.com> wrote:
> 
> I've disconnected the majority of cables from my station and wished I
> had marked a few of them before doing so. Things just don't seem right
> as I reconnect them.
> 
> Can I get some help with the Directional Coupler? There's a KAT500,
> KPA500, and W2 involved.
> 
> Per the manual ...
> "If an ATU is used, it [the KAT500] should be placed between the load
> port and the antenna."
> 
> So I'm thinking connections as follows ...
> 
> KPA(RF Output) -> DCoupler(transmitter)
> 
> DCoupler(load) -> ATU(xmtr)
> 
> ATU(ant1) -> antenna
> 
> That seems to put the ATU between the DC load port and the antenna. I
> just don't think I had it like that before though and would welcome
> 2nd opinions.
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