[Elecraft] K3: just how wide is it?

[Larry Phipps]

I ordered the option a few days ago, Brett, but haven't received it yet.

73,
Larry N8LP



Brett Howard wrote:
> Very cool!!  Now I'd be interested to see what those measurements look like
> with the general coverage receive board installed to see how much it truly
> doesn't affect performance.  
>
> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jack Smith
> Sent: Friday, February 08, 2008 6:01 AM
> To: dj7mgq at muenchen-mail.de
> Cc: Larry Phipps; elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3: just how wide is it?
>
> It's probably too early in the morning for Larry, N8LP, to be up, so 
> I'll mention that he has measured K3 RF filter bandwidth data posted at 
> http://www.telepostinc.com/K3_Stuff.html.
>
> Jack K8ZOA
>
>
>
> dj7mgq at muenchen-mail.de wrote:
>   
>> Hi Doug,
>>
>>     
>>> OK...just how wide is the bandwidth when "limited by the K3's BP 
>>> filters?
>>>       
>> For what it's worth...
>>
>> A quick and very dirty attempt to "simulate" one of the filters using 
>> Elsie 2.12 (free version) gave me in the 10m band filter a -3dB width 
>> of roughly 2.7MHz, after some tuning -> 40pF trimmers to 32pF. I 
>> assumed a Q of 1000 for the capacitors and 200 for the inductors.
>>
>> Maybe using Elsie or the AADE filter designer might help give you a 
>> rough idea, if you can't do simulations with Spice.
>>
>> vy 73 de toby
>>
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