[Elecraft] K3 Sub Receiver Antenna

[Brett Howard]

I'm not so sure that a BPF would solve the problem even if they are on
different bands as the COR may still trip even though the subRX is on
another band...

~Brett (N7MG)

On Mon, Sep 27, 2010 at 11:38 AM, Don Wilhelm <w3fpr at embarqmail.com> wrote:
>  Bill,
>
> My answer is not a "smart remark", but rather the truth - and that
> answer is "Whatever it takes!"
> There are so many variables that your question cannot be answered
> specifically for your location.
> Some of the variables are antenna polarization, physical distance, gain
> of the transmit antenna and its heading relative to the receive
> antenna.  Trees, buildings and other objects that may shield the receive
> antenna from the transmit ant, proximity of feedlines, how much
> radiation is coming back on the feedline for each antenna, plus probably
> a host of other factors that I may not have thought of.
>
> You could make some tests using a simple pickup antenna and a field
> strength meter at your proposed location for the receiving antenna
> before placing it.  Position the temporary pickup antenna for the least
> field strength.
> Unless you have a lot of freedom in the physical location of the receive
> antenna, the simple solution may be to switch in an attenuator for the
> subRX when transmitting.  If the main and the sub are going to be on
> different bands, perhaps a bandpass filter would be a good solution -
> again, the real answer is "Whatever it takes", and hopefully you can
> begin to understand why that is the only answer possible.
>
> 73,
> Don W3FPR
>
> On 9/27/2010 12:59 PM, Bill N3KKM wrote:
>> The K3 manual indicates that the Sub Receiver's AUX antenna must be well-isolated from the transmit antenna to avoid activating the sub's carrier carrier-operated relay. From a practical, real world standpoint, what is "well isolated?"
>>
>> Bill - N3KKM
>>
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