[amsat-bb] AO-92 L Band Power

[Lynn Palmer]

John, 
Yes, of course you are right.  It is important to understand ERP to make comparisons. If I use my actual measured SWR and account for additional losses due to a jumper thru the entrance panel and into the shack, the calculated ERP is probably closer to 500 watts assuming the M2 published gain data of 20.94 dBi represents the actual performance of my "as installed" antenna setup. 
73sLynn  KD9BVG
    On Thursday, July 9, 2020, 11:15:38 AM CDT, John Kludt <johnnykludt at gmail.com> wrote:  
 
  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