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RTTY Dual Passband Filter and RFI?

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Ron W3ZV

RTTY Dual Passband Filter and RFI?

I am working the CQ WPX contest. K3 & FL-7000 amp at about 300W. When I
engage the dual passband filter, I hear a rough buzz, which sounds like
RFI, on my monitored transmit signal. When I disengage the DPF, my
signal sounds clean in the monitor. I continue to make contacts, but a
contest is not a great place for critical signal reports. Any clues?

Ron W3ZV
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wayne burdick

Re: RTTY Dual Passband Filter and RFI?

Administrator

Ron,

We haven't been able to reproduce this (yet).

Are you using the latest beta release (2.82)? It includes a menu entry
called CONFIG:AFSK TX. If you set it to FIL ON, you'll have a 400-Hz
filter around the RTTY transmit tones. Please try that. It should clean
up noise, if that's the issue.

I still don't see how DUAL PB could have anything to do with it. When
you get a chance, please send me your entire receiver setup.

73,
Wayne
N6KR

On Feb 13, 2009, at 6:41 PM, Ron W3ZV wrote:

> I am working the CQ WPX contest. K3 & FL-7000 amp at about 300W. When I
> engage the dual passband filter, I hear a rough buzz, which sounds like
> RFI, on my monitored transmit signal. When I disengage the DPF, my
> signal sounds clean in the monitor. I continue to make contacts, but a
> contest is not a great place for critical signal reports. Any clues?
>
> Ron W3ZV
> ______________________________________________________________
> 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
>
>

Greg - AB7R

Re: RTTY Dual Passband Filter and RFI?

I've been running a KW with the filter on with no problems.

Greg

-----Original Message-----
From: [hidden email]
[mailto:[hidden email]]On Behalf Of wayne burdick
Sent: Friday, February 13, 2009 7:42 PM
To: [hidden email]
Cc: Elecraft
Subject: Re: [Elecraft] RTTY Dual Passband Filter and RFI?

Ron,

We haven't been able to reproduce this (yet).

Are you using the latest beta release (2.82)? It includes a menu entry
called CONFIG:AFSK TX. If you set it to FIL ON, you'll have a 400-Hz
filter around the RTTY transmit tones. Please try that. It should clean
up noise, if that's the issue.

I still don't see how DUAL PB could have anything to do with it. When
you get a chance, please send me your entire receiver setup.

73,
Wayne
N6KR

On Feb 13, 2009, at 6:41 PM, Ron W3ZV wrote:

---

http://www.elecraft.com

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w0mu

Re: RTTY Dual Passband Filter and RFI?

In reply to this post by wayne burdick

I have been using dual PB most of the night. No problems here.

"A slip of the foot you may soon recover, but a slip of the tongue you may
never get over." Ben Franklin
-----Original Message-----
From: [hidden email]
[mailto:[hidden email]] On Behalf Of wayne burdick
Sent: Friday, February 13, 2009 8:42 PM
To: [hidden email]
Cc: Elecraft
Subject: Re: [Elecraft] RTTY Dual Passband Filter and RFI?

Ron,

We haven't been able to reproduce this (yet).

Are you using the latest beta release (2.82)? It includes a menu entry
called CONFIG:AFSK TX. If you set it to FIL ON, you'll have a 400-Hz filter
around the RTTY transmit tones. Please try that. It should clean up noise,
if that's the issue.

I still don't see how DUAL PB could have anything to do with it. When you
get a chance, please send me your entire receiver setup.

73,
Wayne
N6KR

On Feb 13, 2009, at 6:41 PM, Ron W3ZV wrote:

> I am working the CQ WPX contest. K3 & FL-7000 amp at about 300W. When
> I engage the dual passband filter, I hear a rough buzz, which sounds
> like RFI, on my monitored transmit signal. When I disengage the DPF,
> my signal sounds clean in the monitor. I continue to make contacts,
> but a contest is not a great place for critical signal reports. Any clues?
>
> Ron W3ZV
> ______________________________________________________________
> 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
>
>

---

http://www.elecraft.com

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Ed Muns, W0YK

Re: RTTY Dual Passband Filter and RFI?

In reply to this post by Ron W3ZV

I'm running two K3s, each into its own Alpha 86 at 1.5 KW. Same
configuration at home with 87As. I've never encountered what you describe.

Ed - P49X (W0YK)

> -----Original Message-----
> From: [hidden email] [mailto:elecraft-
> [hidden email]] On Behalf Of Ron W3ZV
> Sent: Friday, February 13, 2009 6:41 PM
> To: Elecraft
> Subject: [Elecraft] RTTY Dual Passband Filter and RFI?
>
> I am working the CQ WPX contest. K3 & FL-7000 amp at about 300W. When I
> engage the dual passband filter, I hear a rough buzz, which sounds like
> RFI, on my monitored transmit signal. When I disengage the DPF, my
> signal sounds clean in the monitor. I continue to make contacts, but a
> contest is not a great place for critical signal reports. Any clues?
>
> Ron W3ZV
> ______________________________________________________________
> 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.
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> Version: 8.0.234 / Virus Database: 270.10.23/1949 - Release Date: 02/12/09
> 11:34:00

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