Gerald;
I picked up both of the isolation devices that are available at Radio
Shack, as follows:
(Item #1) Radio Shack "Ground loop eliminator" Cat #: 270-054 @$16.99
(Item #2) Radio Shack "1:1 Isolation transformer" Cat #: 273-1374 @$3.99
Item #1 has no impedance specifications that I can see; It has two circuits.
Item #2 is spec'd as 600-900 Ohms, 300Hz to 5Khz response.
MY QUESTIONS:
(1.) Is there any advantage to using either of these devices?
-I'd much rather use the lower cost unit, as it will be easier to install.
(2.) Is the impedance of item #1 (600-900 Ohms) acceptable?
-Impedance of item #2 is undefined.
(3.) Where do I apply the (item #1) isolation transformer?
-I have been advised to insert isolation into the LINE OUT port (cable)
on the back of the SDR-1000 radio. -Is this correct?
(4.) Do I really need to use both circuits in item #1?
-Or, would I use two of item #2?
(5.) Per question 4; If two of the circuits are needed, where are the
"isolation paths" to be inserted? (-I assume Line in AND line out?)
Sorry for so MANY questions, but I (and perhaps others) have missed
these basic items.
Thank you, GERALD!!!!!!!!!!!
-Mike- K0JTA
Gerald Youngblood said:
"Hi Rob,
Based on your description, you either have a very bad ground loop between
the SDR-1000 and sound card or the sound card has a problem. The Radio
Shack ground isolators work reasonable well in this application for both
transmit and receive.
Gerald
Gerald Youngblood, K5SDR
FlexRadio Systems"
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