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Re: Dual VFO tracking - Split
Hi Tom, ? ? ? ? ? ? ?I am totally confused on this matter as I have spoken to a well known source that tells me if the transponder is linear then the uplink and downlink frequencies are the same on a Digipeater satellite on the same band. As GC is 435.310mhz then transmitting (assuming the correct Doppler is employed) whatever the RX frequency is then the TX should be the same?
? Now I dispute this as I’ve tried RX and TX without split and I’ve never had a single packet received or an ACK from GC. If the other spice is correct then it should send packets that are received from me without issue. Either GC has some kind of audio band pass filter (I always use 1500hz as my CF) or something else is afoot here.?
? Re: sub-VFO. Yes you’re correct and after much research I found that the sub VFO cannot be adjusted with CAT commands, there was never a provision for it.
? Now my mind is really scrambled because every program I’ve used eg: HRD, PSTrotator, Sat-PC32 all try to implement Doppler shift for RX and TX on different frequencies. For example, if the satellite is just over the horizon on 435.313mhz RX then the TX is set at 435.307mhz and all programs follow this trend, non seem to think that the satellite is linear and thus should be on the same frequencies. As the satellite comes close the RX moves close to 435.310mhz on RX and that same for TX with RX going down in frequency and TX going up in frequency. When the satellite is overhead at say 90 degrees the RX and TX should be both at 435.310mhz and then when it’s going away from me the RX goes down past 435.310mhz towards 435.307mhz and the TX goes up to towards 435.313mhz and eventually the satellite disappears beyond the horizon.
? I don’t claim to be an expert in satellite and until GC came along I had never worked a DigiPeater satellite so this has been a steep learning curve for me. I have worked VK from the UK using 6700 delay and successfully made a 10,700 mile QSO of sorts.?
? Using my FT991A which does allow Sub-VFO changes via CAT I can work GC easily and have many USA and Japanese contacts (of course Europe too) with little effort and the Doppler was set and the Downlink frequency was 435.312mhz and Uplink 435.308mhz. So that sort of debunks the totally linear idea unless GC has a really wide audio passband.?
? Again, satellite is very new to me and I’m trying to get my head around it as the physics say up and down are the same on a same frequency DigiPeater, however, GC seems to defy this convention and I’m curious why?
?Sorry to burned the group with this but I’ve looked hard into resolving g this but I just get conflicting information.
The kindest regards,
De Spence M0STO?
Sent while portable! please excuse typos.
toggle quoted message
Show quoted text
On 21 Oct 2023, at 08:21, Tom DJ6TB <tom.io@...> wrote:
?
Hi Spence,
I am working the GC since 6 month and I did not find a solution
for that problem so long
So I drive the main vfo by gpredict (via cat) and adjust the
sub-vfo manually by those values gpredict shows in the TX-qrg
window.
I think the FT-847 has no option to adjust sub-vfo in split mode
on the same band.
There are videos on youtube which show hints by using satpc-32.
But you have to trigger rx/tx/rx/tx manually and so you (normally)
miss the reception of your own transmission digipeated by the
satellite.
73, Tom, DJ6TB
Am 01.10.2023 um 23:49 schrieb Spence
M0STO via groups.io:
?
Dear group,
? ? ? ? ? ? ? ? ? ? ?Perhaps if I explain a little
background and what I’ve tried it may help to prevent things
I’ve done being repeated.
GreenCube is my problem! Working GreenCube is a nightmare
because of one reason, it’s a satellite and it’s also a
digipeater.
? Every program I’ve tried will happily tune the main VFO
but will not change the sub VFO. PSTrotator, HRD etc. OmniRig
does not seem to like to change the sub VFO while it’s tuning
the main VFO.?
? The FT847 has a major drawback though. In satellite mode
split mode this is achieved easily because the bands are V/U
or U/V uplink and downlink and full duplex but GreenCube sits
on the same frequency (bar Doppler correction). So the radio
will “error” when trying to TX on the same band, that’s common
knowledge.?
? The issue is when in split mode (the only real way to
work GreenCube and Doppler shift), as above, all software
shows the VFO change in software but not on the radio. I’ve
had extensive conversations with Codrut (PSTrotator) and after
many adjustments to his software he can’t manage to get the
sub VFO to alter with the main VFO. The nearest I’ve been to
achieving this was in HRD and setting the Uplink and Downlink
manually but as above only the “main” downlink VFO would
alter.
? I know that some versions of the FT847 had some issues
with asynchronous communications but this wouldn’t affect the
communication when altering the frequency.?
? I plan to inspect the bit data and see if sub-VFO
commands are actually being sent. I’ve successfully sent
manual commands to turn on sat mode, LSB/USB mode, enter
frequencies etc.?
? I wonder if anyone has any thoughts on this?
|
Please see the list of CAT commands but none mention
Split?! And there isn’t a provision for altering the sub-VFO
in the command structure that I can see!.
? Is it actually possible? Even repeater mode would’t work
as it would have a constant frequency indifference and not
change with Doppler bringing uplink and down link together at
90degrees (straight above would probably have 0 Doppler
shift).
?Any thoughts appreciated,
De Spence M0STO?
Sent while portable! please excuse typos.
Re: Dual VFO tracking - Split
Hi Spence,
I am working the GC since 6 month and I did not find a solution
for that problem so long
So I drive the main vfo by gpredict (via cat) and adjust the
sub-vfo manually by those values gpredict shows in the TX-qrg
window.
I think the FT-847 has no option to adjust sub-vfo in split mode
on the same band.
There are videos on youtube which show hints by using satpc-32.
But you have to trigger rx/tx/rx/tx manually and so you (normally)
miss the reception of your own transmission digipeated by the
satellite.
73, Tom, DJ6TB
Am 01.10.2023 um 23:49 schrieb Spence
M0STO via groups.io:
toggle quoted message
Show quoted text
?
Dear group,
? ? ? ? ? ? ? ? ? ? ?Perhaps if I explain a little
background and what I’ve tried it may help to prevent things
I’ve done being repeated.
GreenCube is my problem! Working GreenCube is a nightmare
because of one reason, it’s a satellite and it’s also a
digipeater.
? Every program I’ve tried will happily tune the main VFO
but will not change the sub VFO. PSTrotator, HRD etc. OmniRig
does not seem to like to change the sub VFO while it’s tuning
the main VFO.?
? The FT847 has a major drawback though. In satellite mode
split mode this is achieved easily because the bands are V/U
or U/V uplink and downlink and full duplex but GreenCube sits
on the same frequency (bar Doppler correction). So the radio
will “error” when trying to TX on the same band, that’s common
knowledge.?
? The issue is when in split mode (the only real way to
work GreenCube and Doppler shift), as above, all software
shows the VFO change in software but not on the radio. I’ve
had extensive conversations with Codrut (PSTrotator) and after
many adjustments to his software he can’t manage to get the
sub VFO to alter with the main VFO. The nearest I’ve been to
achieving this was in HRD and setting the Uplink and Downlink
manually but as above only the “main” downlink VFO would
alter.
? I know that some versions of the FT847 had some issues
with asynchronous communications but this wouldn’t affect the
communication when altering the frequency.?
? I plan to inspect the bit data and see if sub-VFO
commands are actually being sent. I’ve successfully sent
manual commands to turn on sat mode, LSB/USB mode, enter
frequencies etc.?
? I wonder if anyone has any thoughts on this?
|
Please see the list of CAT commands but none mention
Split?! And there isn’t a provision for altering the sub-VFO
in the command structure that I can see!.
? Is it actually possible? Even repeater mode would’t work
as it would have a constant frequency indifference and not
change with Doppler bringing uplink and down link together at
90degrees (straight above would probably have 0 Doppler
shift).
?Any thoughts appreciated,
De Spence M0STO?
Sent while portable! please excuse typos.
Re: FT-847 only transmitting on FM mode. de: W1SMS
Will do
Get
On 10 Oct 2023, at 21:14, Steven Simons < ssimons@...> wrote:
Andrew,
Nice to meet you and thanks for the repair tips.
I do have a copy of the service manual - which I plan on reviewing prior to performing any adjustments.
I'll probe the test points you refer to and see what I find.
"stay tuned"....
de: W1SMS
|
Re: FT-847 only transmitting on FM mode. de: W1SMS
You can download load the manuals on this forum, have a poke about
73
Andrew
G8UUG
Get
On 10 Oct 2023, at 21:14, Steven Simons < ssimons@...> wrote:
Andrew,
Nice to meet you and thanks for the repair tips.
I do have a copy of the service manual - which I plan on reviewing prior to performing any adjustments.
I'll probe the test points you refer to and see what I find.
"stay tuned"....
de: W1SMS
|
Re: FT-847 only transmitting on FM mode. de: W1SMS
Andrew,
Nice to meet you and thanks for the repair tips.
I do have a copy of the service manual - which I plan on reviewing prior to performing any adjustments.
I'll probe the test points you refer to and see what I find.
"stay tuned"....
de: W1SMS
|
Re: FT-847 only transmitting on FM mode. de: W1SMS
Check TP1003 ? 
? If this is out of lock you will only get FM! ? 73 ? Andrew ? 
?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Steven Simons
Sent: 10 October 2023 18:18
To: [email protected]
Subject: [YaesuFT847] FT-847 only transmitting on FM mode. de: W1SMS ? To the group;
My trusty FT-847 has stopped transmitting on all bands (HF>UHF) on SSB, CW and AM modes. It does work OK on the FM mode - TX audio via mic is OK.
I did try swapping the TX & RX filter modules with no change.
I also reset the uP using menu #39 without any success.
Any suggestions on where to start troubleshooting?
Thanks and 73,
Steve W1SMS?
|
Re: FT-847 only transmitting on FM mode. de: W1SMS
Hi one of your LO's our out of range, check all the TP, there is one that duold be 4 V you may find it is .2.
Work through the set up procedure on the AF board.
73
Andrew
Get
On 10 Oct 2023, at 18:18, Steven Simons < ssimons@...> wrote:
To the group;
My trusty FT-847 has stopped transmitting on all bands (HF>UHF) on SSB, CW and AM modes. It does work OK on the FM mode - TX audio via mic is OK.
I did try swapping the TX & RX filter modules with no change.
I also reset the uP using menu #39 without any success.
Any suggestions on where to start troubleshooting?
Thanks and 73,
Steve W1SMS?
|
FT-847 only transmitting on FM mode. de: W1SMS
To the group;
My trusty FT-847 has stopped transmitting on all bands (HF>UHF) on SSB, CW and AM modes. It does work OK on the FM mode - TX audio via mic is OK.
I did try swapping the TX & RX filter modules with no change.
I also reset the uP using menu #39 without any success.
Any suggestions on where to start troubleshooting?
Thanks and 73,
Steve W1SMS?
|
Hi The scope is fine, but not what you need,
Get
On 2 Sept 2023, at 20:54, Jaime Eloy < cu3ak@...> wrote:
toggle quoted message
Show quoted text
I'm a rocky? here. I will get this in a week or so...
This will work as the signal generator for what we need ?
Only with a signal generator I will be able to sort this issue ?
----- Mensagem de Andrew Lenton < a@...> --------- Data: Sat, 2 Sep 2023 16:37:01 +0100
De: Andrew Lenton < a@...> Assunto: Re: [YaesuFT847] No S meter reading
Right OK,
?
Do you have a signal generator?
?
?
The issue is low signal on the s meter as shown on the previous pics. The last pic is only to show that all the numbers of the s meter are ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 15:56:59 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Ok let’s start from the beginning:
?
What is the issue, The AF is the audio to the speaker, do you mean RF as your AF in down
?
?
With the AF at maximum I have all the readings. So the display is ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 14:37:21 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Hi Check the contrast level on your radio it needs turning up, the whole display is opaque
?
KR
?
Andrew
?
From: [email protected] [mailto:[email protected]] On Behalf Of Jaime Eloy
Sent: 02 September 2023 14:18
To: [email protected]
Subject: Re: [YaesuFT847] No S meter reading
?
Forgot to add, sorry. Now the pics are attached.
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton < a@...> -----
|
Re: Dual VFO tracking - Split
does Simon's (G4ELI)? sdrconsole do tracking ?
|
Re: Dual VFO tracking - Split
Once upon a time I was using the MS-DOS-based FODTrack when
operating through satellites.? When faced with an in-band satellite
(MIR / ISS Packet, for example), it would put the radio into FM
Repeater mode aimed at the Doppler-corrected downlink frequency,
with an offset that was adjusted in real time to cause a transmit to
land on the doppler-corrected uplink frequency.? I'm not sure what
"modern" tracking software is able to do this, but it certainly
worked back then.
Greg? KO6TH
Spence M0STO via groups.io wrote:
toggle quoted message
Show quoted text
?
Dear group,
? ? ? ? ? ? ? ? ? ? ?Perhaps if I explain a little
background and what I’ve tried it may help to prevent things
I’ve done being repeated.
GreenCube is my problem! Working GreenCube is a nightmare
because of one reason, it’s a satellite and it’s also a
digipeater.
? Every program I’ve tried will happily tune the main VFO
but will not change the sub VFO. PSTrotator, HRD etc. OmniRig
does not seem to like to change the sub VFO while it’s tuning
the main VFO.?
? The FT847 has a major drawback though. In satellite mode
split mode this is achieved easily because the bands are V/U
or U/V uplink and downlink and full duplex but GreenCube sits
on the same frequency (bar Doppler correction). So the radio
will “error” when trying to TX on the same band, that’s common
knowledge.?
? The issue is when in split mode (the only real way to
work GreenCube and Doppler shift), as above, all software
shows the VFO change in software but not on the radio. I’ve
had extensive conversations with Codrut (PSTrotator) and after
many adjustments to his software he can’t manage to get the
sub VFO to alter with the main VFO. The nearest I’ve been to
achieving this was in HRD and setting the Uplink and Downlink
manually but as above only the “main” downlink VFO would
alter.
? I know that some versions of the FT847 had some issues
with asynchronous communications but this wouldn’t affect the
communication when altering the frequency.?
? I plan to inspect the bit data and see if sub-VFO
commands are actually being sent. I’ve successfully sent
manual commands to turn on sat mode, LSB/USB mode, enter
frequencies etc.?
? I wonder if anyone has any thoughts on this?
|
Please see the list of CAT commands but none mention
Split?! And there isn’t a provision for altering the sub-VFO
in the command structure that I can see!.
? Is it actually possible? Even repeater mode would’t work
as it would have a constant frequency indifference and not
change with Doppler bringing uplink and down link together at
90degrees (straight above would probably have 0 Doppler
shift).
?Any thoughts appreciated,
De Spence M0STO?
Sent while portable! please excuse typos.
Dual VFO tracking - Split
? Dear group, ? ? ? ? ? ? ? ? ? ? ?Perhaps if I explain a little background and what I’ve tried it may help to prevent things I’ve done being repeated.
GreenCube is my problem! Working GreenCube is a nightmare because of one reason, it’s a satellite and it’s also a digipeater.
? Every program I’ve tried will happily tune the main VFO but will not change the sub VFO. PSTrotator, HRD etc. OmniRig does not seem to like to change the sub VFO while it’s tuning the main VFO.?
? The FT847 has a major drawback though. In satellite mode split mode this is achieved easily because the bands are V/U or U/V uplink and downlink and full duplex but GreenCube sits on the same frequency (bar Doppler correction). So the radio will “error” when trying to TX on the same band, that’s common knowledge.?
? The issue is when in split mode (the only real way to work GreenCube and Doppler shift), as above, all software shows the VFO change in software but not on the radio. I’ve had extensive conversations with Codrut (PSTrotator) and after many adjustments to his software he can’t manage to get the sub VFO to alter with the main VFO. The nearest I’ve been to achieving this was in HRD and setting the Uplink and Downlink manually but as above only the “main” downlink VFO would alter.
? I know that some versions of the FT847 had some issues with asynchronous communications but this wouldn’t affect the communication when altering the frequency.?
? I plan to inspect the bit data and see if sub-VFO commands are actually being sent. I’ve successfully sent manual commands to turn on sat mode, LSB/USB mode, enter frequencies etc.?
? I wonder if anyone has any thoughts on this?
|
Please see the list of CAT commands but none mention Split?! And there isn’t a provision for altering the sub-VFO in the command structure that I can see!.
? Is it actually possible? Even repeater mode would’t work as it would have a constant frequency indifference and not change with Doppler bringing uplink and down link together at 90degrees (straight above would probably have 0 Doppler shift).
?Any thoughts appreciated,
De Spence M0STO?
Sent while portable! please excuse typos.
Re: Repaired serial port on my FT-847
I considered that, but I didn't want to do more surgery than required.
|
Re: Repaired serial port on my FT-847
if i was to be digging in one of mine it would be getting a upgrade 
|
Can anyone tell me what the difference(s) is/are for the FC10 and FC20?? I have an FT840 and recently bought a FC20 tuner but the FT840 says to use the FC10 tuner.? I am hoping the FC20 will work instead so I need to know what the differences are.? Hopefully they use the same protocol and commands.? Does anyone know if the FC20 will work on the FT840 without any mods?
Thank you.
Jim Pruitt
WA7DUY
|
Re: Repaired serial port on my FT-847
Well done very impressive job
Sent from Jeff M0UHF?
toggle quoted message
Show quoted text
On 15 Sep 2023, at 15:46, Zach Metzinger, N0ZGO <zmetzing@...> wrote:
?Full story and pictures here:
--- Zach
N0ZGO
|
Repaired serial port on my FT-847
Full story and pictures here:
--- Zach
N0ZGO
|
Hi Jaimie,
I think the next stage is contact me directly not go through the group, when your issue is fixed, I will give a summary to the group.
The Tiny Spectrum analyser is a marvel, 10 years ago a 4.5 GHz analyser would be in the region of ?20,000!
The Tiny SP also has a signal generator mode so you can apply 14 MHz at 50uV (-73dBm) this should give you S9 with preamp off, if not then we need to setup and fault find.
73
Andrew
Get
On 2 Sept 2023, at 20:54, Jaime Eloy < cu3ak@...> wrote:
toggle quoted message
Show quoted text
I'm a rocky? here. I will get this in a week or so...
This will work as the signal generator for what we need ?
Only with a signal generator I will be able to sort this issue ?
----- Mensagem de Andrew Lenton < a@...> --------- Data: Sat, 2 Sep 2023 16:37:01 +0100
De: Andrew Lenton < a@...> Assunto: Re: [YaesuFT847] No S meter reading
Right OK,
?
Do you have a signal generator?
?
?
The issue is low signal on the s meter as shown on the previous pics. The last pic is only to show that all the numbers of the s meter are ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 15:56:59 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Ok let’s start from the beginning:
?
What is the issue, The AF is the audio to the speaker, do you mean RF as your AF in down
?
?
With the AF at maximum I have all the readings. So the display is ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 14:37:21 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Hi Check the contrast level on your radio it needs turning up, the whole display is opaque
?
KR
?
Andrew
?
From: [email protected] [mailto:[email protected]] On Behalf Of Jaime Eloy
Sent: 02 September 2023 14:18
To: [email protected]
Subject: Re: [YaesuFT847] No S meter reading
?
Forgot to add, sorry. Now the pics are attached.
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton < a@...> -----
|
Try this:
The scope is fine, but not what you need,
The SA is also a SIgnal Generator and there is a larger version with a 4 inch screen
73
Andrew
Get
On 2 Sept 2023, at 20:54, Jaime Eloy < cu3ak@...> wrote:
toggle quoted message
Show quoted text
I'm a rocky? here. I will get this in a week or so...
This will work as the signal generator for what we need ?
Only with a signal generator I will be able to sort this issue ?
----- Mensagem de Andrew Lenton < a@...> --------- Data: Sat, 2 Sep 2023 16:37:01 +0100
De: Andrew Lenton < a@...> Assunto: Re: [YaesuFT847] No S meter reading
Right OK,
?
Do you have a signal generator?
?
?
The issue is low signal on the s meter as shown on the previous pics. The last pic is only to show that all the numbers of the s meter are ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 15:56:59 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Ok let’s start from the beginning:
?
What is the issue, The AF is the audio to the speaker, do you mean RF as your AF in down
?
?
With the AF at maximum I have all the readings. So the display is ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 14:37:21 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Hi Check the contrast level on your radio it needs turning up, the whole display is opaque
?
KR
?
Andrew
?
From: [email protected] [mailto:[email protected]] On Behalf Of Jaime Eloy
Sent: 02 September 2023 14:18
To: [email protected]
Subject: Re: [YaesuFT847] No S meter reading
?
Forgot to add, sorry. Now the pics are attached.
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton < a@...> -----
|
I'm a rocky? here. I will get this in a week or so...
This will work as the signal generator for what we need ?
Only with a signal generator I will be able to sort this issue ?
----- Mensagem de Andrew Lenton < a@...> --------- Data: Sat, 2 Sep 2023 16:37:01 +0100
De: Andrew Lenton < a@...> Assunto: Re: [YaesuFT847] No S meter reading
Right OK,
?
Do you have a signal generator?
?
?
The issue is low signal on the s meter as shown on the previous pics. The last pic is only to show that all the numbers of the s meter are ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 15:56:59 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Ok let’s start from the beginning:
?
What is the issue, The AF is the audio to the speaker, do you mean RF as your AF in down
?
?
With the AF at maximum I have all the readings. So the display is ok.
----- Mensagem de Andrew Lenton <a@...> ---------
Data: Sat, 2 Sep 2023 14:37:21 +0100
De: Andrew Lenton <a@...>
Assunto: Re: [YaesuFT847] No S meter reading
Hi Check the contrast level on your radio it needs turning up, the whole display is opaque
?
KR
?
Andrew
?
From: [email protected] [mailto:[email protected]] On Behalf Of Jaime Eloy
Sent: 02 September 2023 14:18
To: [email protected]
Subject: Re: [YaesuFT847] No S meter reading
?
Forgot to add, sorry. Now the pics are attached.
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton <a@...> -----
----- Fim da mensagem de Andrew Lenton < a@...> -----
|
Spence G5STO
Andrew Lenton
Jeff M0UHF