I am new to the satellites. Got to where I can hear my downlink if the bird is higher than 15 degrees. My question is about handling the doppler shift.
If you do not have a sat program automatically correcting you rig frequency, what is the most common or preffered technique? 1 - Hold the TX steady and adj the RX for doppler or 2- Hold the RX steady and adjust the TX for doppler? I know this must be a basic question but I am learning. Thanks,
Doug K9DLP
Hi Doug, KA9DLP
Hold the RX steady and adjust the TX for doppler.This is what I did manually from OSCAR-6 and I do actually on VO-52, FO-29 and OSCAR-7
73" de
i8CVS Domenico
----- Original Message ----- From: "Douglas Phelps" dphelps1@ameritech.net To: amsat-bb@amsat.org Sent: Thursday, June 09, 2011 2:59 AM Subject: [amsat-bb] SSB Operation on the satellites.
I am new to the satellites. Got to where I can hear my downlink if the bird is higher than 15 degrees. My question is about handling the doppler shift.
If you do not have a sat program automatically correcting you rig frequency, what is the most common or preffered technique? 1 - Hold the TX steady and adj the RX for doppler or 2- Hold the RX steady and adjust the TX for doppler? I know this must be a basic question but I am learning. Thanks,
Doug K9DLP _______________________________________________ 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
At 10:59 AM 6/9/2011, Douglas Phelps wrote:
If you do not have a sat program automatically correcting you rig frequency, what is the most common or preffered technique? 1 - Hold the TX steady and adj the RX for doppler or 2- Hold the RX steady and adjust the TX for doppler? I know this must be a basic question but I am learning. Thanks,
Adjust the higher frequency of the two you're using.
73 de VK3JED / VK3IRL http://vkradio.com
I am new to the satellites. Got to where I can hear my downlink if the bird is higher than 15 degrees. My question is about handling the doppler shift.
If you do not have a sat program automatically correcting you rig frequency, what is the most common or preffered technique? 1 - Hold the TX steady and adj the RX for doppler or 2- Hold the RX steady and adjust the TX for doppler? I know this must be a basic question but I am learning. Thanks,
Doug K9DLP
Hi!
Good question.
Hold the TX steady and adjust the RX. If You adjust TX, the other guy have to adjust also his RX and then his TX... a mess. It is much easier if everybody adjust only his own RX and keeps TX steady.
73 Jari OH3UW
Hi Doug,
Here is the best article on the subject with an explanation of why and what to do:
http://www.amsat.org/amsat/features/one_true_rule.html
Welcome to satellites!
73, Tony AA2TX AMSAT, VP Engineering
--- ----- Original Message ----- From: "Douglas Phelps" dphelps1@ameritech.net To: amsat-bb@amsat.org Sent: Wednesday, June 8, 2011 8:59:51 PM Subject: [amsat-bb] SSB Operation on the satellites.
I am new to the satellites. Got to where I can hear my downlink if the bird is higher than 15 degrees. My question is about handling the doppler shift.
If you do not have a sat program automatically correcting you rig frequency, what is the most common or preffered technique? 1 - Hold the TX steady and adj the RX for doppler or 2- Hold the RX steady and adjust the TX for doppler? I know this must be a basic question but I am learning. Thanks,
Doug K9DLP _______________________________________________ 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 (5)
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aa2tx＠comcast.net -
Douglas Phelps -
i8cvs -
Jari Koivurinne -
Tony Langdon