[Elecraft] Flaw in the 1.8 kHz roofing filter - Final for 2009

[Robert Wood]

In general K3 owners bought for the high performance "numbers"

The ARRL numbers on the dynamic range for 1.8 filter in the QST review 
provide "great results" but that is subjective - subjective.  Far below 
expected numbers even if it is better then Brand x

The hamfest story below is great salesman hand waving - no numbers, no 
reposted test results
To claim the problem is fixed implies that there are test results
or to state another way, to claim the problem is fixed without posting test 
results is questionable
I doubt the story below was in response to the ARRL article

It's doubtful anyone will perform a retest - (ARRL certainly NOT)
a Retest by someone outside the firm like Sherwood, etc. would be good
( although we maybe too busy reading about firmware updates.....hi)

The ARRL QST article as minimum indicates that not all xtal filters of same 
model are equal

back to RF,   Robert w5aj





----- Original Message ----- 
From: "Fred Atchley" <hamkt4fk at att.net>
To: <Elecraft at mailman.qth.net>
Sent: Friday, October 16, 2009 12:14 AM
Subject: Re: [Elecraft] Flaw in the 1.8 kHz roofing filter


At the recent Santa Barbara Hamfest, Eric addressed a problem with the 
early
filters in the K3.

The frequency would change unexpectedly. Eventually the problem was solved
by cleaning.

It was found that particles left over from the crystal manufacturing were
modifying the freq.

Inrad is just down the street from Elecraft and together they resolved the
issue.



I use the 1.8 in my K3 (#2241) with great results.



73, Fred AE6IC

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