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@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/)%C2%A0 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@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@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 _______________________________________________ Sent via AMSAT-BB@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
_______________________________________________ Sent via AMSAT-BB@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