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

[Merv Schweigert]

Inrad selects the best filters for the K3,  the others which do not meet
K3 specs are sold as Yaesu filters. 
And thats the truth..
Merv KH7C 
> Personally, I find it easier to believe that Inrad fixed the problem 
> based upon Elecraft's subjective confirmation of such than I do your 
> totally subjective implication that they might be collectively and 
> intentionally lying to us.
>
> Dave   AB7E
>
>
>
> Robert Wood wrote:
>   
>> 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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