Re: Digital Modes on Linear Sats
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
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 mjswiatk@gmail.com 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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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 k0jm.mark@gmail.com 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 mjswiatk@gmail.com 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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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 mjswiatk@gmail.com 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 k0jm.mark@gmail.com 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 mjswiatk@gmail.com 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 MHzListen 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 = 435.803AO-07 = 145.928 HO-113 = 435.168and so forth for other satellites. Maybe the XWs, CAs, JO-97, and EO-88 birds would be good for FT4, too.
Mike, AA9VIEN52 -----------------------------------------------------------
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The Facebook group FT4 on Sat is helpful if you’re interested in this mode. In the guides section you’ll find the FT4 frequencies that are in common use on a number of satellites: RS-44,435612,145993,USB-D,LSB-D, XW-2A,145667,435048,USB-D,LSB-D, XW-2B,145732,435108,USB-D,LSB-D XW-2C,145797,435168,USB-D,LSB-D, XW-2D,145862,435228,USB-D,LSB-D, XW-2F,145982,435348,USB-D,LSB-D, CAS-4A,145862,435228,USB-D,LSB-D, CAS-4B,145917,435288,USB-D,LSB-D, JO-97,145857,435118,USB-D,LSB-D, AO-109,435762,145888,LSB-D,USB-D TO-108,145917,435288,LSB-D,USB-D FO-29,145998,435,802,LSB-B,USB-D LSB -> UPLINK, USB -> DOWNLINK Ray KN2K
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On Tuesday, October 11, 2022, 4:03 PM, Mike Swiatkowski mjswiatk@gmail.com 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 k0jm.mark@gmail.com 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 mjswiatk@gmail.com 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 MHzListen 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 = 435.803AO-07 = 145.928 HO-113 = 435.168and so forth for other satellites. Maybe the XWs, CAs, JO-97, and EO-88 birds would be good for FT4, too.
Mike, AA9VIEN52 -----------------------------------------------------------
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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-----------------------------------------------------------
Sent via AMSAT-BB(a)amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Acceptable Use and Privacy Policies available at https://www.amsat.org/about-amsat/
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participants (4)
-
crohtun＠aol.com -
Jerry Davis -
Mark Johns, K0JM -
Mike Swiatkowski