KFL3A-1.0K filter for voice???

[jd-2-3]

Hello,

Has anyone tried using the KFL3A-1.0K  1 kHz filter in situations of extremely

close in stations? I realize the audio would be harsh but is it readable?

Is it a viable filter for extreme conditions?

 

Thanks,

Jeff, N0OST

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Ed Muns, W0YK]

First of all, the crystal filter has nothing to do with trying different bandwidths.  The DSP provides complete flexibility, including 1 kHz with the stock 2.7 kHz crystal roofing filter.  But, yes, I've operated at a 1 kHz RX bandwidth on SSB, 400-1400 Hz.  The intelligibility was much better than I expected, but I prefer 1.5 kHz (300-1800 Hz).  If you actually use the KFL3A-1.0K crystal filter with a 1 kHz DSP bandwidth, the cascade will be less, maybe 900 Hz or so.  As I recall, the KFL3A-1.0K is actually about 1.1 kHz at the -6 dB points, so it won't reduce a 1 kHz DSP bandwidth too much lower than about 900 Hz.

 

For bandwidths that you use a lot, a crystal roofing filter slightly wider will provide maximum protection of the DSP from nearby strong signals.  For example, if you operate SSB in heavy QRM a lot, e.g., contests, you might like a 1.6 kHz DSP bandwidth with the KFL3A-1.8K crystal filter.

 

Ed - W0YK

---

From: [hidden email] [mailto:[hidden email]] On Behalf Of JD
Sent: Friday, 28 November, 2008 19:10
To: [hidden email]
Subject: [Elecraft] KFL3A-1.0K filter for voice???

Hello,

Has anyone tried using the KFL3A-1.0K  1 kHz filter in situations of extremely

close in stations? I realize the audio would be harsh but is it readable?

Is it a viable filter for extreme conditions?

 

Thanks,

Jeff, N0OST

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[AC7AC]

CONTENTS DELETED

The author has deleted this message.

[Doc RL]

From N8GU... I have the 1.8 roofing filter.  It is okay during a contest.  Tighter than that makes understanding the voice on the other end extremely difficult.  For a general SSB QSO I usually tighten the DSP filter to 2.1 to 2.2 and that sounds excellent.

JD wrote

Hello,

Has anyone tried using the KFL3A-1.0K  1 kHz filter in situations of
extremely

close in stations? I realize the audio would be harsh but is it readable?

Is it a viable filter for extreme conditions?

 

Thanks,

Jeff, N0OST


_______________________________________________
Elecraft mailing list
Post to: [e-mail]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com