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Re: ERP on V and L for AO-40??



Hi Bob,

I got the 25 and 100 W numbers from the AMSAT DL web site. These were the
results of their first weekend of transponder testing. This was obviously
with good downlink antennas as one station reported hearing the transponder
noise floor near apogee.

73,

John
KD6OZH

----- Original Message -----
From: "Bob McElligott" <bmcellig@kornet.net>
To: "John Stephensen, KD6OZH" <kd6ozh@AMSAT.Org>; <amsat-bb@AMSAT.Org>
Sent: Tuesday, 12 June 2001 09:34 UTC
Subject: RE: [amsat-bb] ERP on V and L for AO-40??


> John and all:
> These are pre-launch numbers.  From present day experiences, what are the
> real numbers for EIRP for planning purposes?
>
> 73,
>
> Bob
> HL2/KK4UZ
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of John Stephensen, KD6OZH
> Sent: Tuesday, June 12, 2001 4:59 PM
> To: Tony Langdon; amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] ERP on V and L for AO-40??
>
>
> I just looked up the prelaunch numbers in the 1999 ARRL Handbook and they
> are 100 W EIRP for 70 cm and 400 W EIRP for 23 cm. AO-40 was designed to
> provide a larger SNR on the downlink so I suspect that the lower EIRP
values
> give AO-13-like performance.
>
> 73,
>
> John
> KD6OZH
>
> ----- Original Message -----
> From: "Tony Langdon" <tlangdon@atctraining.com.au>
> To: "'John Stephensen, KD6OZH'" <kd6ozh@AMSAT.Org>; "Doug Faunt N6TQS
> +1-510-655-8604" <faunt@panix.com>; <amsat-bb@AMSAT.Org>
> Sent: Tuesday, 12 June 2001 04:37 UTC
> Subject: RE: [amsat-bb] ERP on V and L for AO-40??
>
>
> > That low?  U/S portable, here we come! :)
> >
> > 25W EIRP on 70 is pretty straightforward, just have to make sure the S
> band
> > downlink is up to scratch.  Need some form of portable mount for a 26"
> > offset fed dish.
> >
> > Tony Langdon.
> > Systems Development and Support.
> > ATC Training Australasia.  Level 2 321 Exhibition St Melbourne  3000.
> > Phone:  1300 13 1983     WWW:  http://www.atctraining.com.au
> >
> >
> >
> > > -----Original Message-----
> > > From: John Stephensen, KD6OZH [mailto:kd6ozh@gte.net]
> > > Sent: Tuesday, 12 June 2001 13:16
> > > To: Doug Faunt N6TQS +1-510-655-8604; amsat-bb@AMSAT.Org
> > > Subject: Re: [amsat-bb] ERP on V and L for AO-40??
> > >
> > >
> > > AMSAT-DL recently published 25W EIRP for 70 cm and 100W EIRP
> > > for 13 cm for
> > > SSB (without LEILA). Information from AMSAT-NA a few years
> > > ago indicated
> > > that digital uplinks will require 6 times more power. I
> > > decided to shoot for
> > > 200W EIRP on 70 cm and crank the power down for voice operation.
> > >
> > > 73,
> > >
> > > John
> > > KD6OZH
> > >
> > > ----- Original Message -----
> > > From: "Doug Faunt N6TQS +1-510-655-8604" <faunt@panix.com>
> > > To: <amsat-bb@AMSAT.Org>
> > > Sent: Monday, 11 June 2001 19:10 UTC
> > > Subject: [amsat-bb] ERP on V and L for AO-40??
> > >
> > >
> > > > My apologies if this has been answered definitively, but there's so
> > > > much information available I'm not able to sort it out, and
> > > I've been
> > > > concentrating on the S-Band downlink question.
> > > >
> > > > What ERP should be adequate for good signals on U and L uplinks for
> > > > communication "all the time", "most of the time", and "some of the
> > > > time"?
> > > >
> > > > Obviously it depends on the quality of the setup at the RX
> > > end to some
> > > > degree, but obviously with LEILA in action there's an upper
> > > limit, and
> > > > I suspect there's a bell curve.
> > > >
> > > > I can easily work out antenna, transmission line and output
> > > power if I
> > > > know ERP numbers.
> > > >
> > > > 73, doug
> > > > ----
> > > > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> > > >
> > >
> > > ----
> > > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> > >
>
> ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
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>

----
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