Luc,

Glad the rig is back up. My experience, and that of some of the command stations, is that the mode-L uplink is actually +3 KHz up from the nominal value. That seems consistent whether you are on voice or digital. Of course the exact frequency you use will depend on the calibration of your rig, transverter LO, etc. Using a precision counter, I found that my rig was where it should be, but the transverter LO was off by about 10 KHz. Of course, you can fix that in HRD or SATPC32.

73s,

Alan WA4SCA

-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Luc Leblanc Sent: Friday, March 26, 2010 6:24 AM To: amsat-bb@amsat.org Subject: [amsat-bb] AO-51 L band frq

I was able to find some time yesterday to repair my L band DEM linear always the same issues with the N type connector solder tab on the board who break if the coax is putting some stress on the center pin. I heard someone on AO-51 this morning just at the end of the pass (i don't get his call sign) who told me the L band uplink was 5 to 6 KC up the listed frequency? It could explain why i always have to tuned higher than my PC corrected doppler uplink frequency on L band.

Aside of this signals where great aside of the constant background noise probably some kind of radar as reported in the past. At the first over the Atlantic pass the noise was not there it starts when AO-51 was approaching the continent. "-"

Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE

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