more SSB satellite experimenting (23 August)
Hi!
Today, I planned to spend most of the morning at a city park in north Phoenix (a park straddling the DM33/DM43 grid boundary) to try a few passes on DO-64 and VO-52. I also worked an AO-51 pass using my all-mode setup (two FT-817NDs with Arrow Antennas handheld 2m/70cm Yagi), before those SSB birds started making their morning passes here - and before it reached 41C/106F outside!
The DO-64 pass I tried first was about 22 degrees maximum elevation to the east. I could hear the beacon, and could hear my CW going through the transponder. I could not hear myself when using the mic. Since the second pass to the west was about the same elevation, I didn't try it. I was on VO-52 for two passes, both passes having maximum elevation in the 20-25 degree range. I heard a couple of stations in SSB on each pass, I was able to hear myself call CQ a lot during each of the passes, but logged no QSOs.
Since I am not using computer control, I have tried not to park near the center of the passbands on these satellites. Specifically for VO-52, I have tried to park around 145.910 or 145.915 MHz on the downlink as not to interfere with others around 145.900 MHz using full computer control. Unfortunately for me today, nobody ventured up to find me during the passes.
During the second (western) VO-52 pass around 1825-1840 UTC, I started reducing my power as I called CQ. The FT-817ND has 4 power levels, and I went down from the high power (5W) setting to the lowest level (500mW) and could still hear myself clearly through VO-52. Antenna polarization was more important as the power level went down, in order to get to and through the transponder. I had to twist my Yagi around more, to make sure I could make the round- trip to the satellite. This is a good thing, as now I know I can use a lower power level if I am operating with only the FT-817ND's internal NiMH battery pack. I normally use one of my two 12V/20Ah jumpstart battery packs to power my two FT-817NDs or (for the FM birds) my IC-2720H when on the satellites.
Since next weekend is a holiday weekend for the US (and Canada), I hope to be on VO-52 and maybe DO-64 during those 3 days. I might try AO-7 if there is a high pass in my area as well. If you are on during those passes next weekend, please feel free to tune up the passband. Please be patient with me, as I am not set up for computer control on my radios - yet. If things go well, I will do some demonstrations on VO-52 along with the 3 FM satellites during the upcoming ARRL Southwestern Division convention here in the Phoenix area on 12-14 September.
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/
Hi Patrick & the group!
Yea, it topped out around 106 to 107 here in Las Vegas, NV. However, you know well as I do, it's a dry heat. :) Anyhow, great operating and keep cool.
73,
Jeff WB3JFS
----- Original Message ----- From: "Patrick STODDARD (WD9EWK/VA7EWK)" amsat-bb@wd9ewk.net To: amsat-bb@amsat.org Sent: Saturday, August 23, 2008 10:22 PM Subject: [amsat-bb] more SSB satellite experimenting (23 August)
Hi!
Today, I planned to spend most of the morning at a city park in north Phoenix (a park straddling the DM33/DM43 grid boundary) to try a few passes on DO-64 and VO-52. I also worked an AO-51 pass using my all-mode setup (two FT-817NDs with Arrow Antennas handheld 2m/70cm Yagi), before those SSB birds started making their morning passes here - and before it reached 41C/106F outside!
The DO-64 pass I tried first was about 22 degrees maximum elevation to the east. I could hear the beacon, and could hear my CW going through the transponder. I could not hear myself when using the mic. Since the second pass to the west was about the same elevation, I didn't try it. I was on VO-52 for two passes, both passes having maximum elevation in the 20-25 degree range. I heard a couple of stations in SSB on each pass, I was able to hear myself call CQ a lot during each of the passes, but logged no QSOs.
Since I am not using computer control, I have tried not to park near the center of the passbands on these satellites. Specifically for VO-52, I have tried to park around 145.910 or 145.915 MHz on the downlink as not to interfere with others around 145.900 MHz using full computer control. Unfortunately for me today, nobody ventured up to find me during the passes.
During the second (western) VO-52 pass around 1825-1840 UTC, I started reducing my power as I called CQ. The FT-817ND has 4 power levels, and I went down from the high power (5W) setting to the lowest level (500mW) and could still hear myself clearly through VO-52. Antenna polarization was more important as the power level went down, in order to get to and through the transponder. I had to twist my Yagi around more, to make sure I could make the round- trip to the satellite. This is a good thing, as now I know I can use a lower power level if I am operating with only the FT-817ND's internal NiMH battery pack. I normally use one of my two 12V/20Ah jumpstart battery packs to power my two FT-817NDs or (for the FM birds) my IC-2720H when on the satellites.
Since next weekend is a holiday weekend for the US (and Canada), I hope to be on VO-52 and maybe DO-64 during those 3 days. I might try AO-7 if there is a high pass in my area as well. If you are on during those passes next weekend, please feel free to tune up the passband. Please be patient with me, as I am not set up for computer control on my radios - yet. If things go well, I will do some demonstrations on VO-52 along with the 3 FM satellites during the upcoming ARRL Southwestern Division convention here in the Phoenix area on 12-14 September.
73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/
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participants (2)
-
Jeff Yanko -
Patrick STODDARD (WD9EWK/VA7EWK)