I was able to get a signal through DO-64 on the recent 16:04 UTC pass @ 28 degrees. My downlink signal was not strong but good enough for a quick CW QSO. The beacon was very loud. I did hear W4MVB on SSB. As usual, the downlink signal gets weak on the second half of the pass. Mike Williams K9QHO
On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
As usual, the downlink signal gets weak on the second half of the pass. Mike Williams K9QHO
Got the same results here i got explanations regarding this signal drop for polarisation change but as the satellite attitude is uncontrolled i tend to believe it's more an effect of the antennas pointing towards the earth station and pointing away than a polarisation issue. This change in the signal level start exactly pass the TCA point and signal degrade up to a point he's drop below the noise?
I try to figure out the satellite shape spinning and thumbing in space in regard of the polarisation and it will be very odd that the polarisation change happen just at TCA?
Any ideas here?
"-"
Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE
I listened to a pass earlier this morning ago over Miami Florida. Good strong CW beacon heard throughout the entire pass, down until about 1 degree, but still nothing heard on my uplink.
73 de W4AS Sebastian
On Sep 13, 2008, at 12:03 PM, Luc Leblanc wrote:
On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
As usual, the downlink signal gets weak on the second half of the pass.
Mike Williams K9QHO
Got the same results here i got explanations regarding this signal drop for polarisation change but as the satellite attitude is uncontrolled i tend to believe it's more an effect of the antennas pointing towards the earth station and pointing away than a polarisation issue. This change in the signal level start exactly pass the TCA point and signal degrade up to a point he's drop below the noise?
I try to figure out the satellite shape spinning and thumbing in space in regard of the polarisation and it will be very odd that the polarisation change happen just at TCA?
Any ideas here?
I tried Delfi this weekend as well. As Sebastian stated the CW beacon was very strong at times. I could never find my signal (or anyone else's) regardless of how much I tuned.
IC-910 and 40 el uplink, 22 el down and mirage KP2.
----- Original Message ----- From: "Sebastian" w4as@bellsouth.net To: "AMSAT BB" AMSAT-BB@amsat.org Sent: Monday, September 15, 2008 7:21 PM Subject: [amsat-bb] Re: DO-64
I listened to a pass earlier this morning ago over Miami Florida. Good strong CW beacon heard throughout the entire pass, down until about 1 degree, but still nothing heard on my uplink.
73 de W4AS Sebastian
On Sep 13, 2008, at 12:03 PM, Luc Leblanc wrote:
On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
As usual, the downlink signal gets weak on the second half of the pass.
Mike Williams K9QHO
Got the same results here i got explanations regarding this signal drop for polarisation change but as the satellite attitude is uncontrolled i tend to believe it's more an effect of the antennas pointing towards the earth station and pointing away than a polarisation issue. This change in the signal level start exactly pass the TCA point and signal degrade up to a point he's drop below the noise?
I try to figure out the satellite shape spinning and thumbing in space in regard of the polarisation and it will be very odd that the polarisation change happen just at TCA?
Any ideas here?
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Whats the required EIRP for DO-64?
Tim T. K4SHF
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of JW Sent: Tuesday, September 16, 2008 5:02 AM To: Sebastian; AMSAT BB Subject: [amsat-bb] Re: DO-64
I tried Delfi this weekend as well. As Sebastian stated the CW beacon was very strong at times. I could never find my signal (or anyone else's) regardless of how much I tuned.
IC-910 and 40 el uplink, 22 el down and mirage KP2.
----- Original Message ----- From: "Sebastian" w4as@bellsouth.net To: "AMSAT BB" AMSAT-BB@amsat.org Sent: Monday, September 15, 2008 7:21 PM Subject: [amsat-bb] Re: DO-64
I listened to a pass earlier this morning ago over Miami Florida. Good strong CW beacon heard throughout the entire pass, down until about 1 degree, but still nothing heard on my uplink.
73 de W4AS Sebastian
On Sep 13, 2008, at 12:03 PM, Luc Leblanc wrote:
On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
As usual, the downlink signal gets weak on the second half of the pass.
Mike Williams K9QHO
Got the same results here i got explanations regarding this signal drop for polarisation change but as the satellite attitude is uncontrolled i tend to believe it's more an effect of the antennas pointing towards the earth station and pointing away than a polarisation issue. This change in the signal level start exactly pass the TCA point and signal degrade up to a point he's drop below the noise?
I try to figure out the satellite shape spinning and thumbing in space in regard of the polarisation and it will be very odd that the polarisation change happen just at TCA?
Any ideas here?
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
_______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Hi Sebastian,
besides the fact that polarization of your uplink signal may make a huge difference since the satellite is slowly tumbling, the transponder has a frequency offset. 435.556MHz actually corresponds to 145.900MHz on the downlink (instead of 435.550). Some people have reported even higher offsets which are likely to be caused by temperature dependency of the local oscillators on board the satellite, so it may help to tune around a bit in order to find your own downlink, which makes operating the transponder a challenge hi:). Good luck working DO-64!
73 on behalf of the DO-64 / Delfi-C3 team,
Wouter Jan Ubbels PE4WJ
I listened to a pass earlier this morning ago over Miami Florida. Good strong CW beacon heard throughout the entire pass, down until about 1 degree, but still nothing heard on my uplink.
73 de W4AS Sebastian
On Sep 13, 2008, at 12:03 PM, Luc Leblanc wrote:
On 13 Sep 2008 at 8:15, WILLIAMS MICHAEL wrote:
As usual, the downlink signal gets weak on the second half of the pass.
Mike Williams K9QHO
Got the same results here i got explanations regarding this signal drop for polarisation change but as the satellite attitude is uncontrolled i tend to believe it's more an effect of the antennas pointing towards the earth station and pointing away than a polarisation issue. This change in the signal level start exactly pass the TCA point and signal degrade up to a point he's drop below the noise?
I try to figure out the satellite shape spinning and thumbing in space in regard of the polarisation and it will be very odd that the polarisation change happen just at TCA?
Any ideas here?
Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (6)
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JW -
Luc Leblanc -
Sebastian -
Tim Tapio -
WILLIAMS MICHAEL -
Wouter Jan Ubbels