[Elecraft] K3: options to buy: a summary of what I learnt from you all...

[Bill W4ZV]

VK7JB wrote:
> 
> # About filters options:
> There was a concensus of opinion that the 2.8 8 pole / 2.7 5 pole swap
> wouldn't be of benefit in my situation and that I should just go with the
> 2.7 / 5 pole stock filter.  
> 
> <SNIP> 
> I've decided that I probably WILL do the 2.8 for 2.7 swap and install 8
> pole filters from the beginning.  One K3 owner pointed out that if I do
> that, I won't have to swap out, or worry about matching, the 5 pole
> filters in the future if/when I come to install the subreceiver.  That
> seemed sensible to me, so I'll put in the 8 pole Inrad filters from the
> beginning and be done with it.  
> 

One comment on this.  Matching the 2.7k filters is not critical at all.  For
example if they vary by 100 Hz total (which is more than I've seen in
building 4 units), you can set the offset to half the difference in each
(e.g. one is -0.79 and the other is -0.89, so you set -0.84 for both).  With
an actual 6 dB bandwidth of about 2800 Hz, you will never notice a 50 Hz
offset.

2.7<>2.8k swap fee = $121, plus second 2.8k for $131, results in $252 more
expensive versus two stock 2.7k filters at no additional charge.  However,
as they say "It's your money!"

73,  Bill

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