[amsat-bb] Not QRP on L-band!!

[Scott Townley <nx7u@xxxxxxx>]

Sorry Jim, have to disagree.
5W may be "QRP", but 5W to a 1.8m dish is NOT QRP.  That's 1.5kW EIRP or so, which is well above the recommended few-hundred-watt category.
Power is irrelevant...EIRP is everything.

> 
> From: "Jim Tudehope (Peoria Arizona)" <jtudehope@cox.net>
> Date: 2003/08/22 Fri PM 01:22:11 EDT
> To: "Amsat Mailing List" <amsat-bb@AMSAT.Org>
> Subject: Re: [amsat-bb] working split on DXpeditions
> 
> " Wayne replies:
> 
> L-band uplinks aren't notched by LEILA, but the loud siren is still there.
> I would argue that you are running TOO MUCH UPLINK POWER if your voice is Q5
> copy on top of the LEILA siren.
> 
> Wayne Estes W9AE
> Mundelein, IL, USA
> "
> 
>     Jim - KL7QR responds ...
> 
>     In my case I use just 5 watts on L mode with a 1.8 meter dish and I can
> be heard through LIELA.   I respectfully disagree based on practical
> experience.
>     Your premise:  IF ( a station can be heard Q5 through LIELA on L mode)
> THEN ( they are using too much power ) is false.  Therefore any conclusion
> of any arguement that uses this mistaken premise is also false.
>     I have had several situations on the air where I was Q5 through LIELA
> even though I am a QRP station.  It may not be 100% of the time but often
> this is true in the SSB mode.
>     I would venture to say if I were to operate in the CW mode the receiving
> stations would have even more success copying my QRP signal through the
> LIELA.
>     I think if a DXpedition were to operate split in the L mode it would
> work better than if they were in U mode.  I think that if LIELA was
> triggered by the U band uplinkers then I would still be heard often times Q5
> while always using acceptable power levels on L mode.
>     Practical case in point.   On the 19th of July 2003 12:13 GMT there was
> a pileup on station HK3GAL Ger from Bogota Columbia.  There was lots of U RX
> AGC receiver attenuation causing "QSB"  from the number of U band uplinkers
> trying to call this station.  I made one call using 5 watts on L mode and
> got him the first try.
>     My conclusion is that L mode works better.  You can often times
> outperform U band uplinks with just a fraction of the power.  My guess is
> one major reason is the L1 RX AGC attenuation is often less than 1 dB while
> the U RX AGC attenuation is always much higher.
> 
>     Best regards,
>     Jim KL7QR / 7
>     Phoenix Arizona DM33up
> 
> Jim Tudehope
> 10553 W. Sands Dr.
> Peoria, Arizona, 85383
> Phone: 623-566-9955
> Fax: 602-650-0669
> T. Inc. http://www.tudehope.com
> Ham Station KL7QR:  http://www.members.cox.net/jtudehope/KL7QR.htm
> 
> 
> 
> 
> ----- Original Message ----- 
> From: "Estes Wayne-W10191" <W10191@motorola.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Friday, August 22, 2003 8:22 AM
> Subject: Re: [amsat-bb] working split on DXpeditions
> 
> 
> > I wrote:
> >
> > There is one major problem when a DX station works split-frequency on
> AO40.  The station calling the DX station never knows when LEILA is notching
> his uplink.
> >
> > Then Rick KG6IAL replied:
> >
> > One more reason to go up on L-band.  ;>)
> >
> > Wayne replies:
> >
> > L-band uplinks aren't notched by LEILA, but the loud siren is still there.
> I would argue that you are running TOO MUCH UPLINK POWER if your voice is Q5
> copy on top of the LEILA siren.
> >
> > Wayne Estes W9AE
> > Mundelein, IL, USA
> > ----
> > Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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> >
> 
> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
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> 

Scott Townley NX7U
Gilbert, AZ  DM43di

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