[Elecraft] New user - two antenna questions

[Mike K2MK]

Hi Peter,

You probably will need the protection on the K3 AUX RF input. There is some
minimal built in protection in the form of carrier operated relays (COR).
You'll see them in the block diagrams at the end of the K3 user manual. But
if you hear the relays clicking while transmitting it's suggested that the
internal protection might not be sufficient. If you are already using the
key out connection on the back of the K3 for an amplifier you can use the
auxiliary key out connection in the 15 pin accessory socket. It is a low
current output so you might require an additional driver transistor if your
current protection device draws high current. Specs are contained in the
user manual. 

The K3 remembers settings such as ANT1 and ANT2 on a per band basis. So yes,
you can have an HF antenna on ANT1 and a 6 meter antenna on ANT2 and not
have to worry about pressing any additional buttons when you change bands.

73,
Mike K2MK



Peter W2IRT wrote
> Hello all,
> Waiting on my K3s, which will be my first-ever Elecraft product. I'm going
> through as much documentation as I can but I have a couple of questions at
> the moment that I'm not seeing any reference to online. I have ordered the
> ATU module and a the second receiver.
> 
> First off, I'm transitioning from a Yaesu Mark V, and I have a K9AY
> receive
> loop that's connected to the radio's auxiliary antenna port. The Mark-V
> requires a relay cutoff to protect the front end from the aux-in line when
> transmitting, which obviously I have installed. Will I need to use this on
> the K3S, and if so, how does it interface? Or is there built-in protection
> within the K3S, so that when I'm transmitting at 1500W I won't risk damage
> to the front end from the receive antenna?
> 
> Second, I have one coax coming in for my HF antennas (and ancillary
> station
> equipment), and a second direct coax for my 6m Yagi on a different tower.
> Is
> it possible to place the 6m Yagi on ANT-2 and HF system coax on ANT-1, and
> have the radio switch automatically when I invoke 6m?
> 
> ---------------------------------------------
> 73 and Good DX
> Peter, W2IRT





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