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How do you DC block an antenna connection to the Sony ICF-SW7600GR?

S

Sammy Reed

Guest
I am planning on getting a Sony ICF-SW7600GR. But there's one problem - I found out that if you have a longwire antenna or something else that's not powered, you'd have to "DC block" the connection from it to the external antenna connection. I keep reading that it would involve a capacitor. I'm guessing you solder the wire from the antenna to one lead, and the connection to Ext. Ant. to the other lead. Is that right? What kind of capacitor should I use, and what value (pf? uf?) should it be? Is there more to it than that?
 
Sammy Reed said:
I am planning on getting a Sony ICF-SW7600GR. But there's one problem - I found out that if you have a longwire antenna or something else that's not powered, you'd have to "DC block" the connection from it to the external antenna connection. I keep reading that it would involve a capacitor. I'm guessing you solder the wire from the antenna to one lead, and the connection to Ext. Ant. to the other lead. Is that right? What kind of capacitor should I use, and what value (pf? uf?) should it be? Is there more to it than that?
Click to expand...

Those would be the correct connections. I recommend a ceramic NPO or COG type, value as large as you can get, something greater than or equal to 1000pF. Beware of Radio Shack parts, they will probably have a 1000pF capacitor, it would just be an inferior type.
 
All radios with an external/rod antennas already incorporate a small,series capacitor in the RF input section
to eliminate circuit detuning due to various antenna loading, and at the same time, block any DC.
Any external cap with a high voltage rating (100-500VDC) and the 1000pf value as rbrucecarter5 says
s/b just fine...
 
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