Its been a while and I need to be refreshed. When using the sats linear transponders how does the transmit receive work.
Does the transmit stay on frequency and tune the receiver for best receive, or does the receiver stay and transmit frequency changes for best receive. Or do both move if your rig supports a satellite mode.
Also I am hearing what I believe is both USB and LSB on the birds. Is one sideband considered to be standard.
--- On Fri, 8/2/13, Bill Booth ve3nxk@gmail.com wrote:
Its been a while and I need to be refreshed. When using the sats linear transponders how does the transmit receive work.
Does the transmit stay on frequency and tune the receiver for best receive, or does the receiver stay and transmit frequency changes for best receive. Or do both move if your rig supports a satellite mode.
There was a article on that some years ago but I'm lost the URL, anyone know it ?
The conclusion was keep the receiver frequency steady and tune the transmitter.
Also I am hearing what I believe is both USB and LSB on the birds. Is one sideband considered to be standard.
USB is the standard for the Downlink.
The sideband used for the uplink depends on whether it's an Inverting transponder or not. AO-7 Mode A would be USB uplink but AO-7 Mode B would be LSB uplink.
73 Trevor M5AKA
On Fri, 08 Feb 2013 18:11:07 +0100, Bill Booth ve3nxk@gmail.com wrote:
Its been a while and I need to be refreshed. When using the sats linear transponders how does the transmit receive work.
Does the transmit stay on frequency and tune the receiver for best receive, or does the receiver stay and transmit frequency changes for best receive. Or do both move if your rig supports a satellite mode.
Also I am hearing what I believe is both USB and LSB on the birds. Is one sideband considered to be standard.
I think the standard is to tune the high band when tuning by hand and prefered is to tune by computer so you stay in the same spot in the passband, not sure what is standard but I think it was usb up and lsb down prefert
Bill
I tune both using SATPC32 or HRD SATtracker. You may not need a satellite mode if you use software.
I've been running across many more folks that tune both these days.
It definitely makes for a less chaotic passband without folks drifting through the passband.
Rule of thumb is that downlink is USB Uplink is LSB for inverting transponders AO7b,FO-29,VO-52 USB for non-inverting AO7a
Dave W0DHB
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Bill Booth Sent: Friday, February 08, 2013 10:11 AM To: amsat-bb@amsat.org Subject: [amsat-bb] protocol for using sats
Its been a while and I need to be refreshed. When using the sats linear transponders how does the transmit receive work.
Does the transmit stay on frequency and tune the receiver for best receive, or does the receiver stay and transmit frequency changes for best receive. Or do both move if your rig supports a satellite mode.
Also I am hearing what I believe is both USB and LSB on the birds. Is one sideband considered to be standard.
Bill,
Full computer doppler control is preferred, but if it isn't possible, tune the higher of the two frequencies. Check out this link for the "One true rule"
http://www.amsat.org/amsat/features/one_true_rule.html
Dave-KB1PVH
Sent from my Verizon Wireless Droid RAZR
Hi Bill,
Take a look at this, still the best info: http://www.amsat.org/amsat/features/one_true_rule.html
You always receive USB but may need to Tx LSB if the transponder is inverting.
73, Tony AA2TX ----
On 2/8/2013 12:11 PM, Bill Booth wrote:
Its been a while and I need to be refreshed. When using the sats linear transponders how does the transmit receive work.
Does the transmit stay on frequency and tune the receiver for best receive, or does the receiver stay and transmit frequency changes for best receive. Or do both move if your rig supports a satellite mode.
Also I am hearing what I believe is both USB and LSB on the birds. Is one sideband considered to be standard.
Bill,
There is a recent article from the Journal which is not on the server which might also be of interest. I will send you a copy.
73s,
Alan WA4SCA
-----Original Message----- From: amsat-bb-bounces@amsat.org [mailto:amsat-bb-bounces@amsat.org] On Behalf Of Anthony Monteiro Sent: Friday, February 08, 2013 12:21 PM To: Bill Booth Cc: amsat-bb@amsat.org Subject: [amsat-bb] Re: protocol for using sats
Hi Bill,
Take a look at this, still the best info: http://www.amsat.org/amsat/features/one_true_rule.html
You always receive USB but may need to Tx LSB if the transponder is inverting.
73, Tony AA2TX ----
On 2/8/2013 12:11 PM, Bill Booth wrote:
Its been a while and I need to be refreshed. When using the sats linear transponders how does the transmit receive work.
Does the transmit stay on frequency and tune the receiver for best receive, or does the receiver stay and transmit frequency changes for best receive. Or do both move if your rig supports a satellite mode.
Also I am hearing what I believe is both USB and LSB on the birds. Is one sideband considered to be standard.
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participants (7)
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Alan -
Anthony Monteiro -
Bill Booth -
Dave Webb KB1PVH -
Dave WØDHB -
PE1RDW -
Trevor .