Subreceiver

[Jon Kåre Hellan]

I wasn't really planning a subreceiver now, but we'll be visiting the U.S. around easter. If the backlog keeps clearing,
I just might be able to bring one home, avoiding 25% VAT plus expensive freight to Europe in a legal manner.
(Not buying a subreceiver at all will save even more money :-) ).

My K3 has 3 filters - 2.7, 1.8 and 0.5. How much sense would it make to order a subreceiver with just the standard
filter?

73
Jon LA4RT


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[Bill W4ZV]

Jon K Hellan wrote

My K3 has 3 filters - 2.7, 1.8 and 0.5. How much sense would it make to order a subreceiver with just the standard
filter?

It depends on how much you plan to use it in contests.  If you are a *serious* SSB/CW contester who plans to use a KRX3 during contests, you probably need both the 1.8 and 0.5.  If not, you don't need extra filters.  If you do plan to add a 500 to the KRX3 for diversity use, you should note the offset of your existing 0.5 and attempt to get one close to it.  It's not critical that 500 offsets be perfectly matched...just within ~50 Hz and then set the common offset to the approximate midpoint.  

BTW my 200 in Main and 500 in Sub differ by 130 Hz in offset, yet I notice no beating when using that combination.  However my case may be unique and you should always use matched offsets for identical filters.

Beware...once you use true diversity, you will never want another rig without it!

73,  Bill

[David Cutter]

When buying new filters, can one specify the offset required?

David
G3UNA

---- Bill W4ZV <[hidden email]> wrote:
>

> >
> >
>
> It depends on how much you plan to use it in contests.  If you are a
> *serious* SSB/CW contester who plans to use a KRX3 during contests, you
> probably need both the 1.8 and 0.5.  If not, you don't need extra filters.
> If you do plan to add a 500 to the KRX3 for diversity use, you should note
> the offset of your existing 0.5 and attempt to get one close to it.  It's
> not critical that 500 offsets be perfectly matched...just within ~50 Hz and
> then set the common offset to the approximate midpoint.  
>
> BTW my 200 in Main and 500 in Sub differ by 130 Hz in offset, yet I notice
> no beating when using that combination.  However my case may be unique and
> you should always use matched offsets for identical filters.
>
> Beware...once you use true diversity, you will never want another rig
> without it!
>
> 73,  Bill
>

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[Bill W4ZV]

On Wed, Dec 17, 2008 at 10:14 AM, d.cutter (via Nabble)
<[hidden email]> wrote:
> When buying new filters, can one specify the offset required?

If you pay the additional $30 fee, I'm sure Elecraft can do that.  I
took my chances with my KRX3 unit and the 500s just happened to match.
 That's probably because they came from the same batch but you might
not be as lucky.  However if the offsets are within ~50 Hz for 500 Hz
filters, there should be no problem setting both filters to the
midpoint.  For 2.7ks, even larger offsets could be tolerated due to
the much wider bandwidth.

73,  Bill