[Elecraft] Elecraft AF1 audio filter

[dw]

Hi Johnny,
You may try seeing what a choke coil in series with the audio to the
speaker or headphone does for you.  I have the Nescaf filter and really
like it for CW.
In most cases, its cleaner than the available internal audio filters.

But I found that adding a 3mH coil and 15uF cap in series (set for
750hz) makes a significant improvement removing harshness.  

I keep my K2's widest filter as wide as it will go, and the coil takes
care of most of the harshness.

A suggestion for you to check out if interested :-]
N1BBR   

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[Elecraft] Elecraft AF1 audio filter

[Johnny Siu]

Hello Elecrafters,

Is this filter also useful in SSB in terms of giving more listening comfort?  I 
like the selectivity of my K3 but still feel the audio of K3 in SSB is fairly 
harsh.  Hence, I would wonder whether the elecraft AF1 filter will give any 
comfort to my ears.  I do not know whether I am luck because I can still hear 
up to 14KHz.

I also read some reviews about Idiompress SCAF-1 audio filter.  However, apart 
from customer services, my limited technical knowledge cannot let me 
distinguish which filters will suit me better.

Any advice from the elecrafters will be appreciated.

73

Johnny VR2XMC
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