[RFI] Mystery Noise (Aren't they all)

[Wes Stewart]

 Hi Chris,
Thanks for that.  I'm not sure where you found the frequency/antenna crossover freq.  I assumed it was 1620, where they go from LW/MW to SW.
As I said to another correspondent, I/m thinking about an external loop/flag antenna.  I'll have to put a blocking cap in since there is B+ on the ext antenna connector.  Another option is one of my SDRs and a laptop.
Wes



    On Wednesday, March 6, 2024 at 05:20:17 PM MST, Chris L. Parker <parker601 at earthlink.net> wrote:  
 
 Wes,

I also have the Sony ICF-SW7600GR. (US model)
Keep in mind the built-in ferrite loop antenna is used only up to 1710 kHz.
At 1711 kHz and above the radio switches to the telescopic rod antenna.
So "sniffing" must be done at 1710 kHz or below to use the directional ferrite loop.
The ATT switch should be set to OFF for maximum sensitivity on either antenna.
I use AM mode set to NORM and tone set to MUSIC for maximum response to 120 Hz type RFI.

Hope this helps.
Chris
AF6PX

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