[Elecraft] Rx-In/Out used for exteranl SDR Device

[Michael Tope]

Yeah, unless the splitter is active, the isolation is only going to be 
as good as the source match (i.e. VSWR looking back toward the RF out 
port of the K3). The devil is always in the details.

73, Mike W4EF...........

On 12/5/2021 1:48 PM, Jim Brown wrote:
> On 12/5/2021 1:18 PM, Joe Subich, W4TV wrote:
>> This only works 1) if the SDR impedance is consistently high from
>> 100 KHz to 54 MHz and 2) the SDR has excess gain to compensate for
>> the loading from the K3 receiver.
>>
>> However without a splitter, there is no protection for the K3 receiver
>> against spurious signals generated by the SDR!
>
> YES! And that, along with the stub-aspect of the loop to an 
> unterminated load, are the reasons for using one of the MiniCircuits 
> hybrid splitters. Note, however, that they are passive devices, and 
> like all passive devices, depend on all ins and outs be properly 
> terminated to meet isolation specs.
>
> 73, Jim K9YC