[Date Prev][Date Next][Thread Prev][Thread Next] - [Date Index][Thread Index][Author Index]

Re: 1.2ghz uplink



I've been following these discussions and trying to see what kind of setup
is going to be required. In theory, I had hoped that we could make the most
use of existing equipment for one half of what may still be functional on
the bird.

Uplink: 70cm
Downlink: 2.4 gig (or whatever it is close to that), with 144 IF.

This way, we can use our existing 70cm radios/amps/antennas and only have to
buy a downconverter and antenna.

Why invest in 1.2 ghz uplink gear if 70cm will work?

Is there something wrong with my plan?




----- Original Message -----
From: "Edward R. Cole" <al7eb@ptialaska.net>
To: <amsat-bb@AMSAT.Org>
Sent: Friday, February 02, 2001 12:21 AM
Subject: Re: [amsat-bb] 1.2ghz uplink


> >From: "Bob V. Johnson" <w7lrd@juno.com>
> >Hello
> >The many threads and ideas on s-band reception have been an education for
> >me, and I  hope to have s-band receive capabilty soon.  Receiving
> >telemetry is ok but I would prefer listening to K0BLT' melodeous voice
> >drifting down from above.  Or Jerry/oe or Paul/vas,  or anyone else I
> >enjoy  talking to.  I want to start a thread on what is required to put a
> >1.2ghz signal 'up there', no politics, guns, cuss words, someones values
> >or lack thereof.  I want to learn the requirements needed, as in;
> >transverters, antennas, link budgets, etc etc.  I am  working on my
> >microwave-phobia, and this bb is a fantastic resource.
> >73...Bob...W7LRD
>
> Excellent idea, Bob.
>
> There have been a couple articles written about L-band requirements, but
it
> should be interesting to get the inputs coming from a discussion on this.
>
> To kick it off, here is what I plan to do:  FT-847 driving a DEM 144/1269
> Tx upconv. with 20w output, thru 100 foot of 1/2 inch hardline to a 45
> element loop yagi [20 dBi] mounted inside the az-el frame of my 2m eme
> array.  I should have about 8-10w at the antenna.  I will suffer 3dB loss
> using horizontal pol. with the circular-pol satellite.  This should result
> in an EiRP of 400-500w [~26 dBw].
>
> If not enough ERP, then I have a K9EK-7289 amp to produce 60-120w.
> Everything in place except the DEM conv.
>
> Ed
>
> ----
> 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



AMSAT Top AMSAT Home