so I know you all will laugh at me but what inverting means lsb down usb up is this correct
LSB up, USB down
Dave - KB1PVH
Sent from my Verizon Wireless DROID X On Feb 27, 2011 9:23 PM, "Kevin Deane" summit496@live.com wrote:
so I know you all will laugh at me but what inverting means lsb down usb
up is this correct
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 Kevin,
The transponder of FO-29 is inverting and to receive correctly in USB on 70 cm you must transmit LSB in 2 meters.
73" de
i8CVS Domenico
----- Original Message ----- From: "Kevin Deane" summit496@live.com To: amsat-bb@amsat.org Sent: Monday, February 28, 2011 3:07 AM Subject: [amsat-bb] fo-29
so I know you all will laugh at me but what inverting means lsb down usb
up is this correct
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
Actually it's the other way around. You transmit on the uplink in LSB so you receive the downlink in USB.
Jim KQ6EA
On 02/28/2011 02:07 AM, Kevin Deane wrote:
so I know you all will laugh at me but what inverting means lsb down usb up is this correct _______________________________________________ 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
No, that's actually a good question. Usually, satellites follow the normal sideband plan for the downlink, and then you have to set your uplink depending on the satellite. So, with FO-29's downlink in the 70cm band, you'd be listening to the downlink on USB, and transmitting on the uplink on LSB.
If you did transmit on USB, your signal would come back down in LSB. Nothing illegal about that, but by breaking with convention most aren't listening that way and it would slow down making a contact.
Good luck,
Greg KO6TH
From: summit496@live.com To: amsat-bb@amsat.org Date: Sun, 27 Feb 2011 18:07:07 -0800 Subject: [amsat-bb] fo-29
so I know you all will laugh at me but what inverting means lsb down usb up is this correct _______________________________________________ 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
so I know you all will laugh at me but what inverting means lsb down usb up is this correct
It means that the signal sideband is inverting upside down in the satellite. It inverts USB to LSB and LSB to USB. It also change your frequency polarity. If you increase your frequency at the uplink, it will get downwards the same amount at the downlink. It is "mirroring" all signals. And converting them to an other band at the same time. :)
-jari oh3uw
On 28/02/2011 10:48, jari.koivurinne@aina.net wrote:
so I know you all will laugh at me but what inverting means lsb down usb up is this correct
It means that the signal sideband is inverting upside down in the satellite. It inverts USB to LSB and LSB to USB. It also change your frequency polarity. If you increase your frequency at the uplink, it will get downwards the same amount at the downlink. It is "mirroring" all signals. And converting them to an other band at the same time. :)
For the birds (and I'm relatively new to this as well) I transmit LSB and receive USB - am I correct in thinking this is the accepted default or does it vary from satellite to satellite?
Best,
Dominic G6NQO
At 10:18 PM 2/28/2011, Dominic Hawken wrote:
For the birds (and I'm relatively new to this as well) I transmit LSB and receive USB - am I correct in thinking this is the accepted default or does it vary from satellite to satellite?
It depends on the transponder. The actual convention is that your downlink is USB. If the transmpnder is inverting, then you need to uplink LSB, if the transponder is non inverting, you need to uplink USB.
73 de VK3JED / VK3IRL http://vkradio.com
On 28/02/2011 18:03, Tony Langdon wrote:
At 10:18 PM 2/28/2011, Dominic Hawken wrote:
For the birds (and I'm relatively new to this as well) I transmit LSB and receive USB - am I correct in thinking this is the accepted default or does it vary from satellite to satellite?
It depends on the transponder. The actual convention is that your downlink is USB. If the transmpnder is inverting, then you need to uplink LSB, if the transponder is non inverting, you need to uplink USB.
Doh - of course - my bad. Receive on USB.
Many thanks,
Dominic G6NQO
participants (8)
-
Dave Webb KB1PVH -
Dominic Hawken -
Greg D. -
i8cvs -
jari.koivurinneļ¼ aina.net -
Jim Jerzycke -
Kevin Deane -
Tony Langdon