Elecraft › [K3]

K3 Diversity and filter selection

Classic

List

Threaded

6 messages Options

Mike Scott-7

K3 Diversity and filter selection

I use my K3 in diversity receive 90% of the time. I have matched 2.7 KHz
filters in both receivers. The sub receiver has only the one filter the main
also has 500 Hz, 6 KHz and 13 KHz filters.

I have had no issues when the two receivers are using different filters. I
may be lucky. I understand that when operating in a CW contest environment
that I will be disadvantaged because of the sub Rx using a broad roofing
filter. I am not a contester.

Your mileage may vary and you can always add filters later.

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
NAQCC 3535
K3-100 #508 / KX1 #1311

______________________________________________________________
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

Steve Ellington

Re: K3 Diversity and filter selection

What is supposed to happen if one uses "unmatched" filters in main/sub rx?
Steve
N4LQ
[hidden email]
----- Original Message -----
From: "Mike Scott" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, December 22, 2009 10:43 AM
Subject: [Elecraft] K3 Diversity and filter selection

>I use my K3 in diversity receive 90% of the time. I have matched 2.7 KHz
> filters in both receivers. The sub receiver has only the one filter the
> main
> also has 500 Hz, 6 KHz and 13 KHz filters.
>
> I have had no issues when the two receivers are using different filters. I
> may be lucky. I understand that when operating in a CW contest environment
> that I will be disadvantaged because of the sub Rx using a broad roofing
> filter. I am not a contester.
>
> Your mileage may vary and you can always add filters later.
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> NAQCC 3535
> K3-100 #508 / KX1 #1311
>
>
> ______________________________________________________________
> 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

--------------------------------------------------------------------------------

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.722 / Virus Database: 270.14.117/2581 - Release Date: 12/22/09
03:09:00

______________________________________________________________
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

Mike Scott-7

Re: K3 Diversity and filter selection

If filters are not matched when operating in diversity mode you can set up a
kind of beat note between the two receivers.

In my case I hear no such effect using mismatched filters, which is why I
say I may be lucky...

Mike Scott - AE6WA
Tarzana, CA (DM04 / near LA)
NAQCC 3535
K3-100 #508 / KX1 #1311

-----Original Message-----
From: Steve Ellington [mailto:[hidden email]]
Sent: Tuesday, December 22, 2009 8:41 AM
To: [hidden email]; [hidden email]
Subject: Re: [Elecraft] K3 Diversity and filter selection

What is supposed to happen if one uses "unmatched" filters in main/sub rx?
Steve
N4LQ
[hidden email]
----- Original Message -----
From: "Mike Scott" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, December 22, 2009 10:43 AM
Subject: [Elecraft] K3 Diversity and filter selection

----------------------------------------------------------------------------
----

No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 9.0.722 / Virus Database: 270.14.117/2581 - Release Date: 12/22/09
03:09:00

______________________________________________________________
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

Steve Ellington

Re: K3 Diversity and filter selection

So it could sound like being in a jet airliner with engines out of sync?
That happened to me once. I was in the back of a plane which had 2 rear
engines. It felt like my head was about to explode! Anyway....It would be
nice if DSP could compensate for that instead of buying expensive filters.
Steve
N4LQ
[hidden email]
----- Original Message -----
From: "Mike Scott" <[hidden email]>
To: "'Steve Ellington'" <[hidden email]>; <[hidden email]>
Sent: Tuesday, December 22, 2009 11:51 AM
Subject: RE: [Elecraft] K3 Diversity and filter selection

> If filters are not matched when operating in diversity mode you can set up
> a
> kind of beat note between the two receivers.
>
> In my case I hear no such effect using mismatched filters, which is why I
> say I may be lucky...
>
> Mike Scott - AE6WA
> Tarzana, CA (DM04 / near LA)
> NAQCC 3535
> K3-100 #508 / KX1 #1311
>
>
> -----Original Message-----
> From: Steve Ellington [mailto:[hidden email]]
> Sent: Tuesday, December 22, 2009 8:41 AM
> To: [hidden email]; [hidden email]
> Subject: Re: [Elecraft] K3 Diversity and filter selection
>
> What is supposed to happen if one uses "unmatched" filters in main/sub rx?
> Steve
> N4LQ
> [hidden email]
> ----- Original Message -----
> From: "Mike Scott" <[hidden email]>
> To: <[hidden email]>
> Sent: Tuesday, December 22, 2009 10:43 AM
> Subject: [Elecraft] K3 Diversity and filter selection
>
>
>>I use my K3 in diversity receive 90% of the time. I have matched 2.7 KHz
>> filters in both receivers. The sub receiver has only the one filter the
>> main
>> also has 500 Hz, 6 KHz and 13 KHz filters.
>>
>> I have had no issues when the two receivers are using different filters.
>> I
>> may be lucky. I understand that when operating in a CW contest
>> environment
>> that I will be disadvantaged because of the sub Rx using a broad roofing
>> filter. I am not a contester.
>>
>> Your mileage may vary and you can always add filters later.
>>
>> Mike Scott - AE6WA
>> Tarzana, CA (DM04 / near LA)
>> NAQCC 3535
>> K3-100 #508 / KX1 #1311
>>
>>
>> ______________________________________________________________
>> 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
>
>
> ----------------------------------------------------------------------------
> ----
>
>
>
> No virus found in this incoming message.
> Checked by AVG - www.avg.com
> Version: 9.0.722 / Virus Database: 270.14.117/2581 - Release Date:
> 12/22/09
> 03:09:00
>

Tom Hammond-2

Re: K3 Diversity and filter selection

In reply to this post by Steve Ellington

Hi Steve:

WORST CASE... if you attempt DIVERSITY reception (during which both RXs are
supposed to be receiving on the same (exact) frequency, you will probably
note a slight 'beat' between the two received signals. This will usually
present itself as a (usually slow) side-to-side (assuming a 2-speaker
configuration) movement of the perceived received signal at a rate determined
by the amount of frequency mismatch between the two filters... usually on the
order of 3Hz or less... often 1Hz or less.

73,

Tom Hammond N0SS

At 10:41 12/22/2009, you wrote:

>What is supposed to happen if one uses "unmatched" filters in main/sub rx?
>Steve
>N4LQ
>[hidden email]
>----- Original Message -----
>From: "Mike Scott" <[hidden email]>
>To: <[hidden email]>
>Sent: Tuesday, December 22, 2009 10:43 AM
>Subject: [Elecraft] K3 Diversity and filter selection
>
>
> >I use my K3 in diversity receive 90% of the time. I have matched 2.7 KHz
> > filters in both receivers. The sub receiver has only the one filter the
> > main
> > also has 500 Hz, 6 KHz and 13 KHz filters.
> >
> > I have had no issues when the two receivers are using different filters. I
> > may be lucky. I understand that when operating in a CW contest environment
> > that I will be disadvantaged because of the sub Rx using a broad roofing
> > filter. I am not a contester.
> >
> > Your mileage may vary and you can always add filters later.
> >
> > Mike Scott - AE6WA
> > Tarzana, CA (DM04 / near LA)
> > NAQCC 3535
> > K3-100 #508 / KX1 #1311
> >
> >
> > ______________________________________________________________
> > 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
>
>
>--------------------------------------------------------------------------------
>
>
>
>No virus found in this incoming message.
>Checked by AVG - www.avg.com
>Version: 9.0.722 / Virus Database: 270.14.117/2581 - Release Date: 12/22/09
>03:09:00
>
>______________________________________________________________
>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

______________________________________________________________
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

George & Jan

Re: K3 Diversity and filter selection

In reply to this post by Steve Ellington

Steve,
If you install the unmatched filters according to the IB, The 2 receivers
will sound like they are slowly alternating between the two speakers or
earphones.
If you are using SSB then just set-up the filters using the average offset
for both and you won't have that effect and save a $ or 2. I use a 2.8 KHz 8
Pole in the main and a 2.7 KHz 5 pole in the sub (set with 0.0 offset) with
no ill effects.
Don't know if it works well in CW.
George
AI4VZ

What is supposed to happen if one uses "unmatched" filters in main/sub rx?
Steve
N4LQ
ml

______________________________________________________________
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