Re: [amsat-bb] Getting ready for mode L/S

["John Wilcox" <ns1z@xxxxxxxxx>]

Unless you had one of the neighborhood kids put the connector on the LDF5-50
your loss for 50' should only be .7-.8 dB. At 2.4 it would just be 1.0 dB.
You should have plenty of smoke left for the bird...

----- Original Message -----
From: Kenneth Shutt <kgshutt@earthlink.net>
To: <amsat-bb@AMSAT.Org>
Cc: <k5guu@arrl.net>
Sent: Tuesday, July 17, 2001 10:47 PM
Subject: [amsat-bb] Getting ready for mode L/S


> Since transponder operation on AO-40 is on the verge of reality (again), I
> am working on commissioning a Mode L uplink.  My antenna will be a
Directive
> Systems Loop Yagi Model 2345LYK.  Gain specified is 20 dBi.  The radio is
a
> FT-736R with 1.2 Ghz module with nominal output of 10 watts.  My
> transmission line will be approximately 50' of 7/8 in heliax with 5 to 10
ft
> lengths of Belden 9913 on each end.  I am calculating about 3 to 4 db of
> transmission line loss.  My question is this:
>
> Will I need an additional power amp?
>
> My EIRP should be about 10 watts  * 100 * 0.5 = 500 watts less about 3 db
> penalty for linear polarization or about 250 watts.
>
> Any comments?
>
> 73 de Ken
> K5GUU
>
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