Doesn't matter if the SDR Play input is well above 50 Ohms. What
matters is the *RELATIVE DIFFERENCE* between the SDR and the K3.
Unless both track closely the lower impedance device will "suck out"
signal from the higher impedance device.
In addition, one still needs isolation to prevent spurious signals
(e.g. Local oscillator, phase noise, harmonics etc.) generated in
one device from impacting the other.
73,
... Joe, W4TV
On 2018-07-17 1:08 PM, Bob McGraw K4TAX wrote:
My measurements indicate the SDR Play input Z is well above 50 ohms and no
degration in signal strength was noted.
Bob, K4TAX
Sent from my iPhone
On Jul 17, 2018, at 9:16 AM, Joe Subich, W4TV <li...@subich.com> wrote:
You will need a (hybrid) splitter ... connect the common port of
the splitter to the RX ANT Out jack, connect one output of the
splitter to RX ANT IN and connect the other output of the splitter
to the SDRPlay antenna jack.
A splitter is necessary to keep one receiver from loading the
other resulting in loss of sensitivity. The receivers (K3, SDRPlay)
do not have identical input impedance across their range and one
receiver or the other can become (relatively) deaf on certain
frequencies depending on the characteristics of the input circuits.
There are those who will say use a BNC T ... that may or may not
be satisfactory depending on cable lengths and receiver input
characteristics. Unlike a hybrid splitter, the BNC T connector has
no isolation between output ports which allows spurious signals
generated in one receiver to be coupled directly into the other.
73,
... Joe, W4TV
On 2018-07-17 9:16 AM, Steve Muenich wrote:
Hello gang,
Is there a proper port on the K3S to connect a SDRPlay that would allow for
sharing the main antenna while receiving, then be disconnected and isolated
when the K3S go into transmit?
Thanks
Steve, NA5C
K3S 10121
Sent from my mobile device
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