[Elecraft] KSB2 bandwidth - 1.9 kHz?

[Baker]

On Fir, 2 Jan 2004 15:04:29 +0100, Sverre Holm wrote:

> I have seen recommendations for both the 2.2 and the 2.5 kHz
> bandwidths,
> but so far no one seems to advocate the 1.9 kHz bandwidth - the one
> which is closest to the original KSB2 design bandwidth. Is this a
> correct observation? Is there too much punch and too little
> fidelity in
> that bandwidth, even for QRP SSB?
>
> I am about to do the bandwidth mod myself and am leaning towards 2.2
> kHz, but would like to hear other's opinions first.
>
>
I have installed the capacitor values for a 2.5kHz B/W. On air reports 
show TX B/W of 2.2 to 2.3kHz. That suits me fine.
On receive both LSB & USB responses are symmetrical, but start to roll 
off at 2kHz and are 10dB down at 2.5kHz (2nd Xtal filter ?).

These results are much better than my FT1000MP with standard filters 
which gives me a noisy 2.5kHz B/W on receive. 

73

Stewart G3RXQ


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