Tried to work the 1201Z 06AUG2011 pass of ARRISSat-1 from FM26 this morning without much luck. I have been successfully working the FM birds for a while but this is my first attempt with a linear bird. I was wandering if someone with a similar setup could verify my settings?
Equipment as follows:
Icom IC-910H Gulf Alpha 2M/70cm dual band yagi. 2M->6 element 70cm->8 element antenna
LVB tracker box connected to a Yaesu G-5500 Az/El Rotator controlled by Ham Radio Deluxe.
In HRD I set the following:
Rx - Center of 145.930 USB Tx - Center of 435.750 LSB
I set it to control doppler on *both* freqs. I am pulling the keps from Celestrak now.
This morning's pass was to North->South and to the West of my location(FM26au). I noticed that the Rx was always being set lower than the center freq, and the Tx was lower before max elev and higher after Max elev. I had about a 9min window. About a 1/3 of the way into the pass I thought I heard some garbled voice. In the last 1/4 of the pass I definitely was hearing some CW. I can post the recorded .wav file if necessary.
Would greatly appreciate any help.
73, Bill - W4RVN
In HRD, do you have the transponder set up as inverted (RX mode USB, TX mode LSB, Linear Inverting Transponder button clicked)? If you have it set up right, the TX frequency should track in the opposite direction as you tune the RX.
It is normal for the TX frequency to be lower in the early part of the pass and higher later: you are trying to maintain a constant frequency received at the satellite, and the motion of the satellite ADDS to your uplink frequency as it approaches you, and subtracts from it as the satellite moves away.
George, KA3HSW
----- Original Message ----
From: Bill Photinos Bill@photinos.com To: amsat-bb@amsat.org Sent: Sat, August 6, 2011 8:02:51 AM Subject: [amsat-bb] ARISSSat-1 Help
Tried to work the 1201Z 06AUG2011 pass of ARRISSat-1 from FM26 this morning without much luck. I have been successfully working the FM birds for a while but this is my first attempt with a linear bird. I was wandering if someone with a similar setup could verify my settings?
Equipment as follows:
Icom IC-910H Gulf Alpha 2M/70cm dual band yagi. 2M->6 element 70cm->8 element antenna
LVB tracker box connected to a Yaesu G-5500 Az/El Rotator controlled by Ham Radio Deluxe.
In HRD I set the following:
Rx - Center of 145.930 USB Tx - Center of 435.750 LSB
I set it to control doppler on *both* freqs. I am pulling the keps from Celestrak now.
This morning's pass was to North->South and to the West of my location(FM26au). I noticed that the Rx was always being set lower than the center freq, and the Tx was lower before max elev and higher after Max elev. I had about a 9min window. About a 1/3 of the way into the pass I thought I heard some garbled voice. In the last 1/4 of the pass I definitely was hearing some CW. I can post the recorded .wav file if necessary.
Would greatly appreciate any help.
73, Bill - W4RVN
On 6 Aug 2011 at 9:02, Bill Photinos wrote:
Date sent: Sat, 06 Aug 2011 09:02:51 -0400 From: Bill Photinos Bill@photinos.com Subject: [amsat-bb] ARISSSat-1 Help To: amsat-bb@amsat.org
Tried to work the 1201Z 06AUG2011 pass of ARRISSat-1 from FM26 this morning without much luck. I have been successfully working the FM birds for a while but this is my first attempt with a linear bird. I was wandering if someone with a similar setup could verify my settings?
Is it possible as the analog transponder that multiple signals on the uplink reduce the downlink signal up to a point where we are unable to hear anything? As some are reporting using very low power i guess they where probably alone when they made their transmission through the transponder?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe DSTAR urcall VE2DWE WAC BASIC CW PHONE SATELLITE
On Sat, Aug 6, 2011 at 10:39 AM, Luc Leblanc lucleblanc6@videotron.ca wrote:
On 6 Aug 2011 at 9:02, Bill Photinos wrote:
Date sent: Sat, 06 Aug 2011 09:02:51 -0400 From: Bill Photinos Bill@photinos.com Subject: [amsat-bb] ARISSSat-1 Help To: amsat-bb@amsat.org
Tried to work the 1201Z 06AUG2011 pass of ARRISSat-1 from FM26 this morning without much luck. I have been successfully working the FM birds for a while but this is my first attempt with a linear bird. I was wandering if someone with a similar setup could verify my settings?
Is it possible as the analog transponder that multiple signals on the uplink reduce the downlink signal up to a point where we are unable to hear anything? As some are reporting using very low power i guess they where probably alone when they made their transmission through the transponder?
Luc --
I recorded the transponder downlink band on my funcube dongle while testing the transponder, and had a chance to listen to the result several times. It doesn't seem that the telem or FM signals are measurably less powerful at the times when a bunch of us got through on the transponder.
I can make the HDSDR data file available to whoever would like to look over it.
73,
Bruce VE9QRP
participants (4)
-
Bill Photinos -
Bruce Robertson -
George Henry -
Luc Leblanc