Samuel, IO-117 is simplex so a UHF rig capable of split operation is required. Doppler shift of tx and rx from the bird’s nominal operating frequency is always equal and opposite in sign..Examples of software that will control for Doppler include the SatPC32ISS version developed for IO-117 and the CSN S.A.T. Other required software to code and decode packets include UZ7HO’s soundmodem (or its equivalent) and a client user interface, the best-in-class being OZ9AAR’s GreenCube Terminal. S5Labs originally recommended that you run at least 25w and have a beam with at least 12dBi of gain. With the heavy congestion on the satellite today, something more like 50w at the driven element and at least 15dBi will get you digipeat rates in the single digits on congested passes.  Decoding packets requires adequate SNR. You’ll hear them by ear well before decoding will start. You may need a mast-mounted preamp to get adequate SNR. BUT…here’s the thing…S5Labs has a requirement to shut down IO-117 now that its mission has ended. “Passivation” is slated for 5 February unless the shut down requirement can be annulled and some other organization takes over control of the bird. That is all yet to be determined. 73, Ray KN2K

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On Sunday, January 28, 2024, 12:25 PM, samuel galet via AMSAT-BB amsat-bb@amsat.org wrote:

<!--#yiv4295153128 .yiv4295153128EmailQuote {margin-left:1pt;padding-left:4pt;border-left:#800000 2px solid;}-->Good afternoon all. Is it possible to decode digipeats and transmit digipeats to io117 without elaborate equipment such as the icom 9700 but just a dual band vhf uhf transceiver with adequate output power on uhf and a simple 440 beam or ground plane antenna all manually positioned? What software do I need to be effective? Thanks to all. 73 de VE2LJV Samuel Galet

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-------- Original message --------From: Bernie and Cheryl via AMSAT-BB amsat-bb@amsat.org Date: 2024-01-27 2:49 a.m. (GMT-05:00) To: ">> AMSAT" amsat-bb@amsat.org Subject: [AMSAT-BB] TX5S (Clipperton Island) on IO-117 Dear Folks:

At 2:02 UTC today (the 27th), I was fortunate enough to work TX5S on IO-117.  I was able to decode a number of their digipeats to the satellite, and I am grateful that they were able to decode one of mine (I got the always appreciated "Logged 73" message from them).

15 minutes later, they sent a text to "ALL" saying "Last Pass" and worked a few more people before the bird hit LOS for me.  It was like they were waving good bye (they are taking down their stuff tomorrow).

They were a great operation on the HF bands, but it's the first time I've worked a major DXpedition on satellite.  What a thrill!

I so hope that we, as a community, can find the means to prevent the decommissioning of IO-117 as announced the other day.  I appreciate AMSAT-NA reaching out and offering to do whatever is necessary to keep it going.

73 de Bernie, KF0QS

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