It really doesn't matter what frequency is the standard. Most of the guys I know have set their Doppler at 5K above the bottom, but there is a lot of movement going on. The gentleman's agreement was to stay at the lower end of the passband with the digital modes. You may see FreeDV and PSK signals down there also. FT 4 works great on the4 XW, CAS, JO-97 and EO-88 birds. Our group has elected not to get on those birds due to the limited bandwidth and the interference with SSB QSO's. Now if it's late at night a few of us may be on, but it's at a time when there usually no one on the bird. 


Cheers,
Jerry - N5EKO



On Tuesday, October 11, 2022 at 03:03:26 PM CDT, Mike Swiatkowski <[email protected]> wrote:


5 kHz is just as good!  Maybe better.  Let's go with that!

Mike, AA9VI

On Tue, Oct 11, 2022 at 3:01 PM Mark Johns, K0JM <[email protected]> wrote:
Almost everyone in North America is operating at 5 kHz up from the bottom of the downlink passband. I set my WSJT-x at 435.6115. Once in a while I see somebody CQing beyond the passband, more than 3 kHz up from that frequency, but I don't know if they actually work anybody.
--
Mark D. Johns, KØJM
AMSAT Ambassador & News Service Editor
Brooklyn Park, MN USA   EN35hd
-----------------------------------------------
"Heaven goes by favor; if it went by merit,
   you would stay out and your dog would go in."
    ---Mark Twain


On Tue, Oct 11, 2022 at 2:53 PM Mike Swiatkowski <[email protected]> wrote:
I read a message from Jerry, N5EKO, that the gentleman's agreement is to operate 3-10 kHz above the bottom band edge.  WSJT-X may show you about 2.5 to 3 kHz of passband on a typical computer screen. So, that 7 kHz seems a bit much to monitor all at once. I think it'd be easier to just pick a standard calling offset from the bottom band edge to monitor when the satellite is passing.  If we all started listening to +3 kHz to +5.5 kHz USB FT4 mode from the band edge it's a simple rule of thumb and we know where to listen to those signals seemingly under the noise floor.  Many users don't have a band scope.  So, a designated offset would be helpful.

Example:  RS-44  Satellite downlink passband is 435.61 - 435.67 MHz
Listen or CQ by setting SATPC32 satellite (not rig since it changes due to doppler) frequency to 435.613  USB mode and choosing FT4 on WSJT-X

so, the satellite (not rig) downlink frequency for 
FO-29 = 435.803
AO-07  = 145.928 
HO-113 = 435.168
and so forth for other satellites.  Maybe the XWs, CAs, JO-97, and EO-88 birds would be good for FT4, too.


Mike, AA9VI
EN52

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