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Buying a KRX3 - Filter selection help needed!

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Jeff Hall, W6UX-2

Buying a KRX3 - Filter selection help needed!

Hi everyone,

I need advice on picking filters for a KRX3.

I currently have the following filters in my K3:

2.7 kHz 5 pole
1.8 kHz 8 pole
400 Hz 8 pole

Should I put the same filters in the KRX3? At this time, I don't have the capability to take advantage of "diversity receive". It's been a while since I researched filters, but if I recall, it is only the 5-pole that has an "offset" that needs to be matched, correct? Is it overkill to add the other two 8-pole filters if I'm just using the KRX3 to chase DX working split?

Thanks!
Jeff
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Don Wilhelm-4

Re: Buying a KRX3 - Filter selection help needed!

Jeff,

Working split, you will be listening to the 'pack' with the subRX,
Since your interest does not include diversity, I would suggest that you
install the width filter for CW that will provide the most benefit in
separating the 'pack' so you can tell who the DX is working.

On that basis, you might want to put the 250 Hz in the sub, You could
also move the 1.8 to the sub for narrow SSB capability.
However, if you think you will ever use diversity, match the filters in
the main.
Given the wide width of the 2.7 filter, you can cheat (rather than
matching the offset) by telling the K3 that the filter offset is the
average of the two offsets. You could not do that with narrow filters,
but it works OK at wider widths.

73,
Don W3FPR

On 3/2/2013 2:34 PM, Jeff Hall wrote:

> Hi everyone,
>
> I need advice on picking filters for a KRX3.
>
> I currently have the following filters in my K3:
>
>
> 2.7 kHz 5 pole
> 1.8 kHz 8 pole
> 400 Hz 8 pole
>
> Should I put the same filters in the KRX3? At this time, I don't have the capability to take advantage of "diversity receive". It's been a while since I researched filters, but if I recall, it is only the 5-pole that has an "offset" that needs to be matched, correct? Is it overkill to add the other two 8-pole filters if I'm just using the KRX3 to chase DX working split?
>
> Thanks!
> Jeff
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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> Please help support this email list: http://www.qsl.net/donate.html
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Joe Subich, W4TV-4

Re: Buying a KRX3 - Filter selection help needed!

In reply to this post by Jeff Hall, W6UX-2

> Should I put the same filters in the KRX3? At this time, I don't
> have the capability to take advantage of "diversity receive". It's
> been a while since I researched filters, but if I recall, it is only
> the 5-pole that has an "offset" that needs to be matched, correct?
> Is it overkill to add the other two 8-pole filters if I'm just using
> the KRX3 to chase DX working split?

The KRX3 comes with a 2.7 KHz filter ... you can get by by "splitting
the difference" in the offset between the 2.7 in your K3 and the new
2.7 in the KRX3.

Since you are used to the 400 Hz for CW and possibly RTTY, I'd put one
in the KRX2 but you can probably get by without the second 1.8 KHz
filter - particularly since you do not intend to do any "diversity"
receive.

73,

... Joe, W4TV

On 3/2/2013 2:34 PM, Jeff Hall wrote:

Arie Kleingeld PA3A-2

Re: Buying a KRX3 - Filter selection help needed!

In reply to this post by Jeff Hall, W6UX-2

Jast adding my two cents.

No diversitiy possibilities here at PA3A-home.
But sometimes, I take my K3 to the clubstation PI4D (with lots of
antennas) for the big contests. We use the K3 in diversity whenever
possible there! The K3 in that configuration is the favorite trx of
many ops. Everybody loves the diversity.
So if finance is not a problem, duplicate the filters.

73
Arie PA3A

Op 2-3-2013 20:34, Jeff Hall schreef:

Jeff Hall, W6UX-2

Re: Buying a KRX3 - Filter selection help needed!

Good point, Arie. I'm considering it!

Thanks for all the replies folks, I think I'm good to go.

-Jeff

________________________________
From: Arie Kleingeld PA3A <[hidden email]>
To: [hidden email]; [hidden email]
Sent: Sunday, March 3, 2013 5:01 AM
Subject: Re: [Elecraft] Buying a KRX3 - Filter selection help needed!

Jast adding my two cents.

No diversitiy possibilities here at PA3A-home.
But sometimes, I take my K3 to the clubstation PI4D (with lots of
antennas) for the big contests. We use the K3 in diversity whenever
possible there! The K3 in that configuration is the favorite trx of
many ops. Everybody loves the diversity.
So if finance is not a problem, duplicate the filters.

73
Arie PA3A

Op 2-3-2013 20:34, Jeff Hall schreef:

Edward R Cole

Re: Buying a KRX3 - Filter selection help needed!

In reply to this post by Jeff Hall, W6UX-2

I have installed in the main Rx: 13.0, 2.8 KHz, and 400 Hz
filters. I chose to install a 2.8 KHz filter in the sub-Rx. The
13-KHz filter is for VHF-FM and I do not need diversity reception for
that. With the 2.8-KHz filter in both Rx I can do diversity on all
modes except FM/AM. I am not in a high-density ham population where
having a roofing filter for diversity CW is needed. The DSP filter
is adequate. I run VHF diversity reception using two LP-Pan so the
roofing filters are not even used as signal is diverted to the 1st IF
(in fact for MAP65 I select IFIL3 which is an empty slot to avoid
signal suck-out at 8.215 MHz).

Even for non-diversity operation a single SSB filter offers the most utility.

73, Ed - KL7UW

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gm3sek

Re: Buying a KRX3 - Filter selection help needed!

In reply to this post by Arie Kleingeld PA3A-2

>-----Original Message-----
>From: [hidden email] [mailto:elecraft-
>[hidden email]] On Behalf Of Arie Kleingeld PA3A
>Sent: 03 March 2013 13:02
>To: [hidden email]; [hidden email]
>Subject: Re: [Elecraft] Buying a KRX3 - Filter selection help needed!
>
>Jast adding my two cents.
>
>No diversitiy possibilities here at PA3A-home.
>But sometimes, I take my K3 to the clubstation PI4D (with lots of
>antennas) for the big contests. We use the K3 in diversity whenever
>possible there! The K3 in that configuration is the favorite trx of
>many ops. Everybody loves the diversity.

Don't give up on diversity from home - try a small active antenna. From
10MHz downward, I am constantly surprised at what can be heard on the
opposite polarization from the main antennas.

73 from Ian GM3SEK

>So if finance is not a problem, duplicate the filters.
>
>73
>Arie PA3A
>
>Op 2-3-2013 20:34, Jeff Hall schreef:
>> Hi everyone,
>>
>> I need advice on picking filters for a KRX3.
>>
>> I currently have the following filters in my K3:
>>
>>
>> 2.7 kHz 5 pole
>> 1.8 kHz 8 pole
>> 400 Hz 8 pole
>>
>> Should I put the same filters in the KRX3? At this time, I don't have the
>capability to take advantage of "diversity receive". It's been a while

since I
>researched filters, but if I recall, it is only the 5-pole that has an
"offset" that needs
>to be matched, correct? Is it overkill to add the other two 8-pole filters
if I'm just

>using the KRX3 to chase DX working split?
>>
>> Thanks!
>> Jeff
>>
>
>______________________________________________________________
>Elecraft mailing list
>Home: http://mailman.qth.net/mailman/listinfo/elecraft
>Help: http://mailman.qth.net/mmfaq.htm
>Post: mailto:[hidden email]
>
>This list hosted by: http://www.qsl.net
>Please help support this email list: http://www.qsl.net/donate.html