[Elecraft] [K3] Perfect for Field Day S&P ... Limited Production 700 Hz 8-Pole Filters

[Gary W. Hvizdak]

Unless you have a panadapter, you'll never work weak stations, if you can't
hear them because they're outside your passband!  (This is the beauty of 700
Hz!)  In fact, many seasoned Elecraft K3 owners feel that using the radio's
400 Hz default (NORM) CW passband setting, is kind of like "viewing the
world thru a drinking straw while riding a bicycle".  That is, it would be
fairly easy to skip right past a weak calling station, without ever
realizing it was there.

But even more importantly, prolonged scanning with a 400 Hz passband can be
tedious and fatiguing.  This is why, band conditions permitting, savvy
operators prefer a 700 Hz passband:

o   "for general CW tuning" -- W3FPR
o   "for scanning the band (or a pileup)." -- K8GU
o   "for combing through the pileups with VFO [B]" -- NI0C
o   "to cruise the CW bands from a wider perspective" -- N1LQ

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The next batch is due to arrive May 16th.  Demand for these custom filters
can fluctuate dramatically, so it's impossible to say precisely when this
next manufacturing lot might sell out.  (Our best guess is:  "April 1st,
give or take a few weeks".)  A subsequent production run can be expected
about 15 weeks thereafter.

If you have a sub-receiver or you are considering getting one, then FYI the
center frequency offset of individual manufacturing lots, can vary by up to
plus or minus 100 Hz.  In contrast, the variation across any given lot is
typically only plus or minus 5 Hz; yielding superbly matched pairs for
diversity reception!

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Visit http://www.unpcbs.com to place an order, and for full details
including:

o   Retail price.
o   The filter's passband response plot.
o   User comments.
o   Special terms of sale.
o   Bandwidth and availability FAQs.
o   App notes.
o   An animated slideshow illustrating all five INRAD CW bandwidths.

73,
Gary  KI4GGX
(webmaster)