Common Mode Choke Question
Posted: Thu May 23, 2019 11:06 am
Hello,
Hoping to improve somewhat the S/N on my <30 MHz listening.
Have a RSP-2
a. Regarding the common mode chokes, like the one WinRadio offers, do you think these would help any ?
I have a long wire ant outside, feeding a "long" run of coax into the house, then
one of those suggested 1:9 Noo Elec Baluns into the RSP-2 HiZ input.
Arrangement is essentially that shown in the SDRPlay dwg of using these 1:9 Baluns.
Does the 1:9 Noo Elec Balun offer any common mode noise rejection, or "might" a
unit like WinRadio's possibly, in addition, help ?
b. And, the green HiZ connector has a Gnd connection.
Do you folks ground this terminal to earth ground, or just leave alone ?
Thanks,
Bob
WinRadio Common mode Choke Descr.:
"This device provides a means of reducing or eliminating common-mode noise from an antenna feedline, resulting in a considerable increase of the received signal quality. Common-mode noise is generated by computers, lamp dimmers and other electric or electronic appliances. Such noise can be a problem especially in the lower portions of HF spectrum, where weak signals can be sometimes completely masked by assorted buzzes and other unwanted noises.
The Common-Mode Choke can be also very useful to provide an alternative earthing point for an active antenna, if the antenna itself cannot be grounded due to its location, or its ground connection is inadequate."
Hoping to improve somewhat the S/N on my <30 MHz listening.
Have a RSP-2
a. Regarding the common mode chokes, like the one WinRadio offers, do you think these would help any ?
I have a long wire ant outside, feeding a "long" run of coax into the house, then
one of those suggested 1:9 Noo Elec Baluns into the RSP-2 HiZ input.
Arrangement is essentially that shown in the SDRPlay dwg of using these 1:9 Baluns.
Does the 1:9 Noo Elec Balun offer any common mode noise rejection, or "might" a
unit like WinRadio's possibly, in addition, help ?
b. And, the green HiZ connector has a Gnd connection.
Do you folks ground this terminal to earth ground, or just leave alone ?
Thanks,
Bob
WinRadio Common mode Choke Descr.:
"This device provides a means of reducing or eliminating common-mode noise from an antenna feedline, resulting in a considerable increase of the received signal quality. Common-mode noise is generated by computers, lamp dimmers and other electric or electronic appliances. Such noise can be a problem especially in the lower portions of HF spectrum, where weak signals can be sometimes completely masked by assorted buzzes and other unwanted noises.
The Common-Mode Choke can be also very useful to provide an alternative earthing point for an active antenna, if the antenna itself cannot be grounded due to its location, or its ground connection is inadequate."