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Re: LF: RE: SSB-Beacon

from [Rik Strobbe] [Permanent Link][Original]
To: [email protected]
Subject: Re: LF: RE: SSB-Beacon
From: Rik Strobbe <[email protected]>
Date: Tue, 12 May 2009 09:11:15 +0200
In-reply-to: <406BFF543DA74618A3CA53F315277917@radiorummet>
References: <[email protected]> <D1B04AE7FA04475CA50E9FE566D21D8D@AGB> <406BFF543DA74618A3CA53F315277917@radiorummet>
Reply-to: [email protected]
Sender: [email protected]
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: [email protected]
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: [email protected]
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: [email protected] [ mailto:[email protected]]On Behalf Of Gus
Sent: 11 May 2009 22:18
To: [email protected]
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


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