[INRAD] Roofing filter for the IC-775DSP

[Guy Olinger, K2AV]

Given that commercial AM signals are broadcasting with a bandwidth of 
6-8 kHz, and amateur narrowband FM is easily 10, those modes will be 
constricted by a roofing filter with a width of 4 or so.

For a radio that was not designed with multiple roofing filters in 
mind, the use of a narrow roofing filter for advantage in SSB/CW will 
restrict AM and FM. For many, this is of no consequence. Others may 
need to consider before purchase.

73, Guy.


----- Original Message ----- 
From: "Anders Janis SM4RNA" <sm4rna at telia.com>
To: <list at inrad.net>
Sent: Tuesday, November 22, 2005 10:03 PM
Subject: [INRAD] Roofing filter for the IC-775DSP


701-B and 701-CI have found a thing that I finde strange in "IC-775 
ROOFING FILTER INSTALLATION INSTRUCTIONS´"

"This may degrade the audio bandwidth for AM and FM reception 
somewhat. Those modes will still be available for reception with the 
sub receiver."

Is this really true?



/Anders


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