Great message. I too have noticed that AO-51 is so extremely busy to the detriment of all of the others. I have used SO-50, and it's generally quieter, I'm guessing simply by virtue of it not being 51.
To be honest, the fact that I cannot run SSB full-duplex has kept me away from the linear satellites. That, and the fact that I worry about AO-7's fragility. I'd hate to be the one to blow it back into a coma.
On joining AMSAT, I received a laminated card that describes the available modes for each satellite. One of the more useful (for me) sections is a "channelized" list of frequencies for the linears. Though this probably bothers the purists, it's given me a little hope of at least attempting them since I will have a neighborhood to look for.
For those more experienced, I do have a couple of questions:
When operating an inverting linear, do you generally transmit on USB and listen LSB or visa versa?
When operating linear, what's the accepted approach to doppler correction? It seems that you would be able to transmit without any correction, but that your receive would vary a lot more - or perhaps again, visa versa?
There are a number of articles in amsat/arrl journals about getting started on FM, but considerably less written about making the transition to linears. Maybe you can help us get on!
thanks,
Scott NW2S
----- Original Message ----- From: "Scott Wilson" s.wilson@yahoo.com To: k3szh@netzero.net; amsat-bb@amsat.org Sent: Thursday, August 23, 2007 5:38 PM Subject: [amsat-bb] Re: A051
For those more experienced, I do have a couple of questions:
When operating an inverting linear, do you generally transmit on USB and listen LSB or visa versa?
Hi Scott, NW2S
We transmit LSB and we receive USB because doing so many other radio hams dedicated to tropo traffic in VHF/UHF can hear us from the satellite by chance in 2 meters and 70 cm where they normally operate in USB for tropo.
When operating linear, what's the accepted approach to doppler correction? It seems that you would be able to transmit without any correction, but that your receive would vary a lot more - or perhaps again, visa versa?
There are various preferences but since OSCAR-6 I prefere to keep constant the frequency of my return SSB signal while manually correcting the TX frequency to keep my voice constantly clear while speaking. If the operator in contact with me do the same then our QSO start and end on the same frequency during the whole orbit. I prefere to use separate RX and TX and in my case they are nothing special very old and mostly homebrewed equipments.
There are a number of articles in amsat/arrl journals about getting started on FM, but considerably less written about making the transition to linears. Maybe you can help us get on!
Read " The Satellite Experimenter's Handbook " written by Martin Davidoff, K2UBC and edited by the ARRL
thanks,
Scott NW2S
73" de
i8CVS Domenico
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