[Elecraft] K3: SSB - WPX - Filters - Controls

[Ed Muns]

> I see no point at all in buying a 
> 1.8kHz filter for SSB , it is just not necessary. If there is 
> a signal 2kHz away inside the 2.7 but outside the
> 1.8 and 100dB above noise you are going to have problems with 
> their IMDs anyway.

Few people will benefit from narrow SSB filters, but "no point at all" is
going too far.  The 1.8kHz crystal filter is very effective for strong
signals in its stopband but still within the passband of a 2.7kHz filter,
e.g., a clean SSB signal 3kHz away.  For most situations the additional
900Hz of IMD protection is not needed, but it is quite useful for serious
contesters trying to keep the rate up on crowded bands.

73,
Ed - W0YK