K4 questions!

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K4 questions!

Elecraft mailing list
Within shipping groups, will the K4D be available as soon as the K4, or later?
To use diversity rx with the K4D, does the second antenna have to be connected to the RX ANT port, or a second ANT port, and do you need the internal ATU to get multiple ANT ports?  Can the internal ATU be assigned to an ANT port, or is it always assigned to ANT 1?  

73, Eric WD6DBM
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Re: K4 questions!

wayne burdick
Administrator
Hi Eric,


> eric norris wrote:
>
> Within shipping groups, will the K4D be available as soon as the K4, or later?

Same time.


> To use diversity rx with the K4D, does the second antenna have to be connected to the RX ANT port, or a second ANT port, and do you need the internal ATU to get multiple ANT ports?  

First, just to clarify for those not familiar with diversity: this requires different antennas for the two receivers, which implies a K4D. (A basic K4 can still receive on any two bands simultaneously, but only with a shared antenna.)

With no ATU installed, your choices for the second receiver's antenna would include RX ANT IN 1 and RX ANT IN 2. You could even use these two RX antenna jacks for the main and sub receivers, independent of the main antenna jack, which would still be used for transmit.

With an ATU installed, you'd be able to specify any one of its three antennas as an RX antenna. This can then be assigned to either or both receivers. So this, too, is a diversity antenna option.


> Can the internal ATU be assigned to an ANT port, or is it always assigned to ANT 1?

The ATU has three antenna jacks (ANT 1/2/3). At a given time, one of these can be assigned to the LC network and thus be available for transmit (and optionally for either or both receivers). The two jacks not assigned to transmit are then available for possible use as receive antennas (see above).

As an example, here's the control sequence you'd use to select ANT 1 for transmit, RX ANT 2 for the main receiver, and RX ANT 2 for the sub receiver.

    ANT     (selects transmit antenna; tap once or twice to get to ANT1 icon)

    RX ANT > RX1   (main receiver)

    SUB ANT > RX2  (sub receiver)

The default for both receivers is to use the same antenna as the transmitter. This is selected by:

    RX ANT > =TX

    SUB ANT > =TX

Antenna configurations are stored per-band. You can optionally assign names (like "YAGI3", "LOOP", etc.) to antennas using an on-screen QWERTY keyboard. These names will then show up in place of the main RX/sub RX/TX antenna icons.

73,
Wayne
N6KR

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