[amsat-bb] AO-92 L Band Power

[John Kludt]

 All

The important thing to remember is ERP.  Using the KV5R calculator and
assuming an SWR or 1.2:!  the ERP for this contact was  618 watts.  (
http://kv5r.com/ham-radio/coax-loss-calculator/)  The antenna gain was
based on the published gain for the M2 35 element Yagi .

Ten watts may or may not be enough.  What we need to do is look at the
overall system of losses ( coax) and gains (antenna).

Hope this helps

John K4SQC

On Thu, Jul 9, 2020 at 10:13 AM Lynn Palmer via AMSAT-BB <amsat-bb at amsat.org>
wrote:

> Hi Alan, I use 10 watts from my Icom IC-9700. I run about 100 feet of LMR
> 600 coax so maybe 5 watts to the antenna.  I use a 35 element yagi
> antenna.  I made the satellite today at 14 degrees elevation OK.
> 73sLynnKD9BVG
>
>     On Wednesday, July 8, 2020, 04:53:09 PM CDT, Alan Blind via AMSAT-BB <
> amsat-bb at amsat.org> wrote:
>
>  Using 10 Watts, I have not been able to get into AO-92 L Band.
>
> From the AO-92 web site:
>
> ================
>
> ......Since the 435 MHz uplink antenna is used to receive the 1267 MHz
> signals and may present a mismatch at that frequency, pre-launch estimates
> suggest that a power level of 100 watts ERP will be required for
> horizon-to-horizon access in Mode L/v. AMSAT Engineering will issue further
> guidance after in-orbit testing. Look for future articles on the AMSAT
> website and in The AMSAT Journal for equipment ideas and tutorials for
> accessing the L-band uplink.
> ====================
>
> Perhaps my 10 Watts are too low.  Have there been updates from AMSAT on
> recommended L band power?  What power do others run?
>
> Alan
> WA9WUD
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> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: https://www.amsat.org/mailman/listinfo/amsat-bb
>