this method of correcting for doppler is an incorrect practice. It might be fine if you and your buddy are the only two on the satellite. also, notice you say 'you perfer', not the correct method. As doppler affects both frequencies, they should both be corrected using computer control. In the absence of computer control, the higher of the two frequencies is always corrected because doppler affects the higher frequency more. It does not matter if this is your tx or rx, it is always the higher frequency.
73...bruce
-----Original Message-----
From: "i8cvs" [email protected] Subj: [amsat-bb] Re: A051 Date: Thu Aug 23, 2007 3:04 pm Size: 1K To: "Scott Wilson" [email protected], [email protected], "AMSAT-BB" [email protected]
----- Original Message ----- From: "Scott Wilson" [email protected] To: [email protected]; [email protected] 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.