[Elecraft] K3: KRX3 question

[Bill W4ZV]

Eric - WA6HHQ wrote:
> 
> H Tom,
> 
> We will match the 5 pole filters (to within 40 Hz) on request. If your 
> filters are already that close you are in good shape. We can't guarantee 
> a good enough yield on filter offsets to get closer than that, though 
> most will be closer. Fortunately 40 Hz is more than adequate as you can 
> set the K3 menu offsets for the two filters the same at the mean between 
> them and both will be within 20 Hz or less of their ideal center.
> 
> The $30 option is per matched set (not per filter) and will be on the 
> web order form next week. (We're officially on national holiday today 
> :-) We just put it into the in-house ordering system yesterday. This 
> applies to either matching two of the same bandwidth filter at time of 
> shipment or matching a second same b/w filter to one you already have in 
> your radio.
> 
> For everyone else, if you are not planning on doing 2 receiver, 2 
> antenna, diversity reception where the frequency of the sub needs to be 
> matched to withing a Hz of the main, this is not necessary.
> 
> 73, Eric  WA6HHQ
> 
> _..._
> 
> 
> 
> Tom Whiteside wrote:
>> I note in the new KRX3 manual the comment that diversity reception may be
>> enhanced by using filters with matched offsets for the main and
>> sub-receivers.    I'm a 160M nut and this is certainly an important point
>> to me...   I have these filterson backorder:
>>
>> KFL3A-200        2     K3 200 Hz, 5 pole filter
>> KFL3A-500        2     K3 500 Hz, 5 pole filter
>>
>> I'm wondering if Elecraft has plans for shipping these as matched sets or
>> if I should scramble to change my order for 8 pole filters which should
>> not need the offset.    Heads up and anyone know the answer?
>>
>> Tom N5TW
> 
> 

Tom (and others planning to use diversity), this means you have the
following options using the current filter prices:

1.  Dual 5-pole filters (matched by Elecraft).  2 X $100 plus $30 = $230 per
BW.
2.  Dual 8-pole filters (no match needed).  2 X $125 = $250 per BW.

This tilts your decision toward 8-pole filters, however there is still an
issue of bandwidth.  Since the 400 8-pole is actually 435 Hz and the 250
8-pole is actually 370 Hz, I would definitely not order both.  

I'm faced with the same issue but will probably order one matched 500 since
my order was at the original price of $80 for a 5-pole...plus I like the
wider BW for contests.  I was never planning to use the 200 in diversity
mode (you can still use a 500 down to DSP = 250).  

BTW having used my 200 awhile in a few 160 contests, I would absolutely NOT
be without it for huge simplex pileups.  So another option for you might be
two 400s for diversity, and at least one 200 for the extreme situations we
sometimes have on 160.

73,  Bill  W4ZV
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