Return-Path: Received: from rly-df11.mx.aol.com (rly-df11.mail.aol.com [172.19.156.24]) by air-df01.mail.aol.com (v123.4) with ESMTP id MAILINDF011-58a4a092190124; Tue, 12 May 2009 03:13:33 -0400 Received: from post.thorcom.com (post.thorcom.com [193.82.116.20]) by rly-df11.mx.aol.com (v123.4) with ESMTP id MAILRELAYINDF113-58a4a092190124; Tue, 12 May 2009 03:13:23 -0400 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1M3m9n-0001PW-GG for rs_out_1@blacksheep.org; Tue, 12 May 2009 08:12:07 +0100 Received: from [193.82.116.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1M3m9m-0001PM-SI for rsgb_lf_group@blacksheep.org; Tue, 12 May 2009 08:12:06 +0100 Received: from cavuit01.kulnet.kuleuven.be ([134.58.240.43]) by relay1.thorcom.net with esmtp (Exim 4.63) (envelope-from ) id 1M3m9k-0003us-2O for rsgb_lf_group@blacksheep.org; Tue, 12 May 2009 08:12:06 +0100 Received: from smtps01.kuleuven.be (smtpshost01.kulnet.kuleuven.be [134.58.240.74]) by cavuit01.kulnet.kuleuven.be (Postfix) with ESMTP id A81AD7B8043 for ; Tue, 12 May 2009 09:11:15 +0200 (CEST) Received: from dell-rik.fys.kuleuven.be (dhcp-10-33-85-199.fys.kuleuven.be [10.33.85.199]) by smtps01.kuleuven.be (Postfix) with ESMTP id 2CE9B31E702 for ; Tue, 12 May 2009 09:11:15 +0200 (CEST) X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Tue, 12 May 2009 09:11:15 +0200 To: rsgb_lf_group@blacksheep.org X-Kuleuven: This mail passed the K.U.Leuven mailcluster From: Rik Strobbe In-Reply-To: <406BFF543DA74618A3CA53F315277917@radiorummet> References: <406BFF543DA74618A3CA53F315277917@radiorummet> Mime-Version: 1.0 Message-Id: <20090512071115.2CE9B31E702@smtps01.kuleuven.be> X-KULeuven-Information: Katholieke Universiteit Leuven X-KULeuven-Scanned: Found to be clean X-KULeuven-Envelope-From: rik.strobbe@fys.kuleuven.be X-Karma: unknown: X-Spam-Score: 3.2 (+++) X-Spam-Report: autolearn=disabled,HTML_EXTRA_CLOSE=2.699,HTML_FONT_BIG=0.256,HTML_MESSAGE=0.001,MAILTO_TO_SPAM_ADDR=0.276 Subject: Re: LF: RE: SSB-Beacon Content-Type: multipart/alternative; boundary="=====================_56159109==.ALT" X-Spam-Checker-Version: SpamAssassin 2.63 (2004-01-11) on post.thorcom.com X-Spam-Level: * X-Spam-Status: No, hits=1.7 required=5.0 tests=HTML_20_30,HTML_FONTCOLOR_BLUE, HTML_FONT_BIG,HTML_MESSAGE,MAILTO_TO_SPAM_ADDR autolearn=no version=2.63 X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false X-AOL-IP: 193.82.116.20 --=====================_56159109==.ALT Content-Type: text/plain; charset="us-ascii"; format=flowed Gus, Dave, Graham, I guess even the Q of the antenna can attenuate the low and/or high tones. In theory with a SSB bandwidth of 2.7kHz and a operating frequency of 505kHz a Q = 180 would cause a 3 dB attenuation at the ends. But from my experience results could even be worse: Although the Q of my antenna is only 50 I notice a significant power reduction if I tune the antenna mid-band (502.5kHz) and QSY to one of the band edges without re-tuning. I assume that the PA is rather "allergic" to a even rather small reactive part of the load. In addition the fading on 500 can indeed be very frequency-selective. During Graham's 3 mode test I could notice different QSB patterns between the 3 signals (that were only some 100 Hz apart). 73, Rik ON7YD - OR7T At 00:40 12/05/2009, you wrote: >I agree ! What is the valve of inductor ? > >Gus >----- Original Message ----- >From: Graham >To: rsgb_lf_group@blacksheep.org >Sent: Tuesday, May 12, 2009 12:33 AM >Subject: Re: LF: RE: SSB-Beacon > >Gus/Dave > >Might be the Q and BW of the rf path causing a little rounding of >the audio spectrum , need to boost the lf and hf ..or attenuate the >mid range ? > >G . > >From: Dave G3WCB >Sent: Monday, May 11, 2009 11:08 PM >To: rsgb_lf_group@blacksheep.org >Subject: LF: RE: SSB-Beacon > >Gus, > >Your SSB is about readability 4, signal strength 5 in QSB, with lots >of static crashes. It sounds like you might need a bit of audio >processing/compression to boost your "talk power". > >My RX is an ICOM IC-PCR1000 with a tuned pre-amp, and my antenna is >my usual 500/137kHz "tee", 20m long and 5 metres high. > >I have saved a couple of *.wav files - do you want me to send them to you? > >73, Dave G3WCB IO91RM, nr Windsor, S.E. England >-----Original Message----- >From: owner-rsgb_lf_group@blacksheep.org >[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Gus >Sent: 11 May 2009 22:18 >To: rsgb_lf_group@blacksheep.org >Subject: LF: SSB-Beacon > >Dear LF group, > >I test a SSB beacon this evening on 505,5 kHz USB. >Power is abt 1W ERP and there is also a CW id include.... >Reports are wellcome. > >73 de Gus SM6BHZ > > >---------- > >No virus found in this incoming message. >Checked by AVG - www.avg.com >Version: 8.5.287 / Virus Database: 270.12.24/2107 - Release Date: >05/10/09 07:02:00 --=====================_56159109==.ALT Content-Type: text/html; charset="us-ascii" Gus, Dave, Graham,

I guess even the Q of the antenna can attenuate the low and/or high tones.
In theory with a SSB bandwidth of 2.7kHz and a operating frequency of 505kHz a Q = 180 would cause a 3 dB attenuation at the ends.
But from my experience results could even be worse: Although the Q of my antenna is only 50 I notice a significant power reduction if I tune the antenna mid-band (502.5kHz) and QSY to one of the band edges without re-tuning. I assume that the PA is rather "allergic" to a even rather small reactive part of the load.
In addition the fading on 500 can indeed be very frequency-selective. During Graham's 3 mode test I could notice different QSB patterns between the 3 signals (that were only some 100 Hz apart).

73, Rik  ON7YD - OR7T

At 00:40 12/05/2009, you wrote:
I agree ! What is the valve of inductor ?
 
Gus
----- Original Message -----
From: Graham
To: rsgb_lf_group@blacksheep.org
Sent: Tuesday, May 12, 2009 12:33 AM
Subject: Re: LF: RE: SSB-Beacon

Gus/Dave
 
Might be the Q and BW of the rf path causing a little rounding of the audio spectrum , need to  boost the lf and hf ..or attenuate the mid range ?
 
G .

From: Dave G3WCB
Sent: Monday, May 11, 2009 11:08 PM
To: rsgb_lf_group@blacksheep.org
Subject: LF: RE: SSB-Beacon

Gus,
 
Your SSB is about readability 4, signal strength 5 in QSB, with lots of static crashes. It sounds like you might need a bit of audio processing/compression to boost your "talk power".
 
My RX is an ICOM IC-PCR1000 with a tuned pre-amp, and my antenna is my usual 500/137kHz "tee", 20m long and 5 metres high.
 
I have saved a couple of *.wav files - do you want me to send them to you?
 
73, Dave G3WCB IO91RM, nr Windsor, S.E. England
-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org [ mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Gus
Sent: 11 May 2009 22:18
To: rsgb_lf_group@blacksheep.org
Subject: LF: SSB-Beacon
Dear LF group,
 
I test a SSB beacon this evening on 505,5 kHz USB.
Power is abt 1W ERP and there is also a CW id include....
Reports are wellcome.
 
73 de Gus SM6BHZ


No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.287 / Virus Database: 270.12.24/2107 - Release Date: 05/10/09 07:02:00
--=====================_56159109==.ALT--