locked VFO B Shifts From 7074 to 7073 On Transmit When Using Split On Yaesu FT-991A? #Cat_RigControl


Cliff Fox (KU4GW)
 

I'm having an issue and I don't know why it's happening when operating on FT8 when I use the Split setting under the Settings, Radio tab. I was operating on 40 meters and set VFO A to 7074 kHz in DATA-U mode with AGC off and then pressed VFO A=VFO B  to copy the same settings to VFO B and if I'm transmitting as low as 400-800 Hz audio frequency when the FT-991A transmits it's shifting VFO B to 7073 for some reason. If I were transmitting at 1000 or above I would expect a shift up. I turned split off and chose "Fake It" in the WSJT-X settings because of it doing this. It had not been doing this until this past week it started happening, I'm thinking possibly due to operator error. Can anyone tell me what could be causing the shift on VFO B from 7074 to 7073 when I transmit and what would keep it from doing that when using the split VFO setting? Thanks in advance from a real greenhorn on a new to me mode.

Very 73 de 
Cliff, KU4GW


Sam Birnbaum
 

Hi  Cliff,

That is normal operation when using split = rig. It is shifting the frequency so 
that your TX audio is in the middle of the band pass.  

FYI, you do not have to press the "VFOA=VFOB" The program will do that for you.

73,  


Sam W2JDB



-----Original Message-----
From: Cliff Fox (KU4GW) <cliffku4gw@...>
To: main@WSJTX.groups.io
Sent: Tue, Oct 5, 2021 6:26 pm
Subject: [WSJTX] VFO B Shifts From 7074 to 7073 On Transmit When Using Split On Yaesu FT-991A? #Cat_RigControl

I'm having an issue and I don't know why it's happening when operating on FT8 when I use the Split setting under the Settings, Radio tab. I was operating on 40 meters and set VFO A to 7074 kHz in DATA-U mode with AGC off and then pressed VFO A=VFO B  to copy the same settings to VFO B and if I'm transmitting as low as 400-800 Hz audio frequency when the FT-991A transmits it's shifting VFO B to 7073 for some reason. If I were transmitting at 1000 or above I would expect a shift up. I turned split off and chose "Fake It" in the WSJT-X settings because of it doing this. It had not been doing this until this past week it started happening, I'm thinking possibly due to operator error. Can anyone tell me what could be causing the shift on VFO B from 7074 to 7073 when I transmit and what would keep it from doing that when using the split VFO setting? Thanks in advance from a real greenhorn on a new to me mode.

Very 73 de 
Cliff, KU4GW





Michael Black
 

To be a little more descriptive....

In order to avoid harmonics and bandwidth limitations Rig Split and Fake It both adjust the transmit frequency so that your audio is maintained in the 1500-2000Hz range in 500Hz segments.
One major advantage is when you see somebody calling above 2500 offset you can go up there with them even if your transmit bandwidth is less than 2500Hz as your audio will still be 1500-2000Hz -- well within your bandpass.

So as you go below 1500 offset your transmit frequency will go down 500Hz so that your audio is still 1500Hz above the suppressed carrier frequency.  Above 1999 frequency will go up.

Example:
14074000 with offset of 1500
14073500 with offset of 1000
14073000 with offset of 500
14072500 with offset < 500
14074500 with offset of 2000
14075000 with offset of 2500

Mike W9MDB



On Tuesday, October 5, 2021, 06:37:19 PM CDT, Sam Birnbaum via groups.io <w2jdb@...> wrote:


Hi  Cliff,

That is normal operation when using split = rig. It is shifting the frequency so 
that your TX audio is in the middle of the band pass.  

FYI, you do not have to press the "VFOA=VFOB" The program will do that for you.

73,  


Sam W2JDB



-----Original Message-----
From: Cliff Fox (KU4GW) <cliffku4gw@...>
To: main@WSJTX.groups.io
Sent: Tue, Oct 5, 2021 6:26 pm
Subject: [WSJTX] VFO B Shifts From 7074 to 7073 On Transmit When Using Split On Yaesu FT-991A? #Cat_RigControl

I'm having an issue and I don't know why it's happening when operating on FT8 when I use the Split setting under the Settings, Radio tab. I was operating on 40 meters and set VFO A to 7074 kHz in DATA-U mode with AGC off and then pressed VFO A=VFO B  to copy the same settings to VFO B and if I'm transmitting as low as 400-800 Hz audio frequency when the FT-991A transmits it's shifting VFO B to 7073 for some reason. If I were transmitting at 1000 or above I would expect a shift up. I turned split off and chose "Fake It" in the WSJT-X settings because of it doing this. It had not been doing this until this past week it started happening, I'm thinking possibly due to operator error. Can anyone tell me what could be causing the shift on VFO B from 7074 to 7073 when I transmit and what would keep it from doing that when using the split VFO setting? Thanks in advance from a real greenhorn on a new to me mode.

Very 73 de 
Cliff, KU4GW








Cliff Fox (KU4GW)
 

Thanks so much for the clarification, Sam. Since that is normal I'm changing the settings back to split operation. I'm wondering which frequency will be saved to the log. I'll find that out in short order. I appreciate this group's patience and advice when it comes to helping newbies to WSJT-X understand how things work when learning a new mode I have barely any experience with at all. The only digital modes I had done up until recently have been Feld-Hell/Hellschreiber, Olivia, MFSK-16, & PSK31. I did help operate the W8H Feld Hell Club Special Event Station from the 62nd Dayton Hamvention in 2013 when it was still being held at Hara Arena before it moved to the Greene County Fairgrounds in Xenia, OH beginning in 2016 with the 65th Dayton Hamvention. I'm sure glad Hamvention wasn't there in 2016, the year the tornado hit Hara Arena! I've been more of a CW operator than anything else in my 25 years in the "world's greatest hobby!" 

Very 73!
Cliff, KU4GW
FT8-DMC # 0747
Feld Hell Club Membership # 0062
Proud Member of the ARRL A-1 Operator Club 
(Elected to full membership April 11, 2012).

 

On Tue, Oct 5, 2021 at 7:37 PM Sam W2JDB <w2jdb@...> wrote:
Hi  Cliff,

That is normal operation when using split = rig. It is shifting the frequency so 
that your TX audio is in the middle of the band pass.  

FYI, you do not have to press the "VFOA=VFOB" The program will do that for you.

73,  


Sam W2JDB



-----Original Message-----
From: Cliff Fox (KU4GW) <cliffku4gw@...>
To: main@WSJTX.groups.io
Sent: Tue, Oct 5, 2021 6:26 pm
Subject: [WSJTX] VFO B Shifts From 7074 to 7073 On Transmit When Using Split On Yaesu FT-991A? #Cat_RigControl

I'm having an issue and I don't know why it's happening when operating on FT8 when I use the Split setting under the Settings, Radio tab. I was operating on 40 meters and set VFO A to 7074 kHz in DATA-U mode with AGC off and then pressed VFO A=VFO B  to copy the same settings to VFO B and if I'm transmitting as low as 400-800 Hz audio frequency when the FT-991A transmits it's shifting VFO B to 7073 for some reason. If I were transmitting at 1000 or above I would expect a shift up. I turned split off and chose "Fake It" in the WSJT-X settings because of it doing this. It had not been doing this until this past week it started happening, I'm thinking possibly due to operator error. Can anyone tell me what could be causing the shift on VFO B from 7074 to 7073 when I transmit and what would keep it from doing that when using the split VFO setting? Thanks in advance from a real greenhorn on a new to me mode.

Very 73 de 
Cliff, KU4GW





 

Cliff,

 

The frequency that’s logged is the TX frequency PLUS the audio offset, so the actual frequency of transmission NOT the dial frequency.

 

73 Phil GM3ZZA

 

Sent from Mail for Windows

 

From: Cliff Fox (KU4GW)
Sent: 06 October 2021 10:31
To: Sam W2JDB; main@WSJTX.groups.io Group Moderators
Subject: Re: [WSJTX] VFO B Shifts From 7074 to 7073 On Transmit When Using Split On Yaesu FT-991A? #Cat_RigControl

 

Thanks so much for the clarification, Sam. Since that is normal I'm changing the settings back to split operation. I'm wondering which frequency will be saved to the log. I'll find that out in short order. I appreciate this group's patience and advice when it comes to helping newbies to WSJT-X understand how things work when learning a new mode I have barely any experience with at all. The only digital modes I had done up until recently have been Feld-Hell/Hellschreiber, Olivia, MFSK-16, & PSK31. I did help operate the W8H Feld Hell Club Special Event Station from the 62nd Dayton Hamvention in 2013 when it was still being held at Hara Arena before it moved to the Greene County Fairgrounds in Xenia, OH beginning in 2016 with the 65th Dayton Hamvention. I'm sure glad Hamvention wasn't there in 2016, the year the tornado hit Hara Arena! I've been more of a CW operator than anything else in my 25 years in the "world's greatest hobby!" 

 

Very 73!

Cliff, KU4GW

FT8-DMC # 0747

Feld Hell Club Membership # 0062

Proud Member of the ARRL A-1 Operator Club 

(Elected to full membership April 11, 2012).

 

 

 

On Tue, Oct 5, 2021 at 7:37 PM Sam W2JDB <w2jdb@...> wrote:

Hi  Cliff,

 

That is normal operation when using split = rig. It is shifting the frequency so 

that your TX audio is in the middle of the band pass.  

 

FYI, you do not have to press the "VFOA=VFOB" The program will do that for you.


73,  

 

 

Sam W2JDB

 

 

-----Original Message-----
From: Cliff Fox (KU4GW) <cliffku4gw@...>
To: main@WSJTX.groups.io
Sent: Tue, Oct 5, 2021 6:26 pm
Subject: [WSJTX] VFO B Shifts From 7074 to 7073 On Transmit When Using Split On Yaesu FT-991A? #Cat_RigControl

I'm having an issue and I don't know why it's happening when operating on FT8 when I use the Split setting under the Settings, Radio tab. I was operating on 40 meters and set VFO A to 7074 kHz in DATA-U mode with AGC off and then pressed VFO A=VFO B  to copy the same settings to VFO B and if I'm transmitting as low as 400-800 Hz audio frequency when the FT-991A transmits it's shifting VFO B to 7073 for some reason. If I were transmitting at 1000 or above I would expect a shift up. I turned split off and chose "Fake It" in the WSJT-X settings because of it doing this. It had not been doing this until this past week it started happening, I'm thinking possibly due to operator error. Can anyone tell me what could be causing the shift on VFO B from 7074 to 7073 when I transmit and what would keep it from doing that when using the split VFO setting? Thanks in advance from a real greenhorn on a new to me mode.

Very 73 de Cliff, KU4GW



 


--
73 Phil GM3ZZA