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Re: 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
> >

----
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