[Elecraft] Sub-Rx Filters

[Joe Subich, W4TV]

> When I assembled my K3, I ordered the filters as FM, 2.7, 1.8, 400,
> and had the last slot open. For the K3S, I have (1) FM, (2) 2.8, and
> (2) 400’s. So I have the following questions.
 >
 > How will the filters be installed as a factory build?

My guess is that the filters would be installed in the first two or
three slots as they were in my original factory built K3.

 > If I have a say so, would it make sense to install it as such
 > (O = open)
 > Slot      1     2      3       4       5
 > Main     FM    2.8     O      400      O
 > Sub       O    2.8     O      400      O

That is the way mine are done - the Sub RX has a second FM filter
(I wanted the ability to use wide audio for SWLing with an Aux
antenna) and the main TX has a 1500 Hz filter in slot 3 which I
do not use and the 200 Hz filter in slot 5.

If I were to do it again, there would be no changes except to replace
the 1500 Hz filter with a 1800 or possibly a 2100 (that is my typical
SSB bandwidth).  The FM filter it just fine for AM - both TX and RX.

73,

   ... Joe, W4TV


On 8/8/2015 12:59 AM, Lane wrote:
> Hi,
>
> I have a K3 w/o a sub-receiver and continue to enjoy learning about the
> hobby, and because of that, I’d like to start learning about all the things
> I can do w/ a sub-receiver. So I’ve ordered the new K3S-F. Seeing as I have
> several weeks to rethink my order before it ships, I’d like to better
> understand the sub and filters. I also hear the sub is a pain to remove and
> wanted to get my filters right initially if possible.
>
> When I assembled my K3, I ordered the filters as FM, 2.7, 1.8, 400, and had
> the last slot open. For the K3S, I have (1) FM, (2) 2.8, and (2) 400’s. So
> I have the following questions.
>
> How will the filters be installed as a factory build?
>
> If I have a say so, would it make sense to install it as such (O = open)
> Slot      1       2       3       4       5
> Main    FM   2.8     O      400    O
> Sub       O    2.8     O      400    O
>
> By doing that, I leave the last slot open for 200Hz filters if they come
> back, and slot 3 for something between 2.1 and above 400 if I can find a
> good reason to fill them.
>
> My understanding of diversity reception is that I can receive two different
> frequencies and though used more for CW when working pile-ups, it’s not
> something I’d likely use for FM, hence the single FM roofing filter. So I
> was wondering about installing AM on the sub just so that I could have that
> as well.
>
> I'd be interested in knowing how you guys did it.
>
> Thanks,
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