locked Frequency shifts down 500KHz on transmit #FT8


John
 

Everything was working great, WSJTX, JTAlert and HRD LogBook.
Then there were no decodes the next operating session, no Windows updates to interfere.

I hear and see loads of signals but no activity is shown in the RX pane, the DECODE light flashes now and then, but still no decodes.

I have to confess, I didn't really notice if this is normal for the VFO to shift 500KHz down on transmit, is this normal?

Any help would be appreciated.

FTdx-3000, Yaesu web site drivers, Win 10 Ver 20H2, OS build 19042.964

Thanks,
John
VE7KKQ


Derek Brown
 

John

Are you sure it shifts 500Khz !! thats going put your signals way outside any band we have I fear !!!

Not being an expert, but the only time I have noticed a similar problem with decodes, is that the PC time is way off of spec.

73 Derek G8ECI

On Thursday, 13 May 2021, 08:21:32 BST, John <ve3kkqve3kkq@...> wrote:


Everything was working great, WSJTX, JTAlert and HRD LogBook.
Then there were no decodes the next operating session, no Windows updates to interfere.

I hear and see loads of signals but no activity is shown in the RX pane, the DECODE light flashes now and then, but still no decodes.

I have to confess, I didn't really notice if this is normal for the VFO to shift 500KHz down on transmit, is this normal?

Any help would be appreciated.

FTdx-3000, Yaesu web site drivers, Win 10 Ver 20H2, OS build 19042.964

Thanks,
John
VE7KKQ




Paul Turner
 

A shift of 500Hz (that’s HERTZ not KILOHERTZ!) is completely normal. It allows the program to generate the tones at a higher frequency to keep harmonics outside the TX passband.

 

73, Paul G4IJE.

 

 

From: main@WSJTX.groups.io <main@WSJTX.groups.io> On Behalf Of John
Sent: 12 May 2021 21:35
To: main@WSJTX.groups.io
Subject: [WSJTX] Frequency shifts down 500KHz on transmit #FT8

 

Everything was working great, WSJTX, JTAlert and HRD LogBook.
Then there were no decodes the next operating session, no Windows updates to interfere.

I hear and see loads of signals but no activity is shown in the RX pane, the DECODE light flashes now and then, but still no decodes.

I have to confess, I didn't really notice if this is normal for the VFO to shift 500KHz down on transmit, is this normal?

Any help would be appreciated.

FTdx-3000, Yaesu web site drivers, Win 10 Ver 20H2, OS build 19042.964

Thanks,
John
VE7KKQ


Virus-free. www.avast.com


Dave Garber
 

do you have additional software for time sync.  check your clock at  time.is to see if your clock is off greater than 2.5 seconds ( critical)

try using dimension4, meinberg, or any other available options


Dave Garber
VE3WEJ / VE3IE


On Thu, May 13, 2021 at 3:21 AM John <ve3kkqve3kkq@...> wrote:
Everything was working great, WSJTX, JTAlert and HRD LogBook.
Then there were no decodes the next operating session, no Windows updates to interfere.

I hear and see loads of signals but no activity is shown in the RX pane, the DECODE light flashes now and then, but still no decodes.

I have to confess, I didn't really notice if this is normal for the VFO to shift 500KHz down on transmit, is this normal?

Any help would be appreciated.

FTdx-3000, Yaesu web site drivers, Win 10 Ver 20H2, OS build 19042.964

Thanks,
John
VE7KKQ



Fred Kepner
 

John,

Regarding the shift, the VFO frequency remains constant on my FT-DX3000 between transmit and receive.  I would check two things:

1)  Make sure you aren't in Hound Mode.
2)  On the settings tab, check that split operation is turned off.

I had the same problem recently with a different Yaesu radio.  I use two different profiles, one for normal FT8 and one for F/H FT8.  I changed split to off for the normal FT8 profile and the problem was fixed.

73
Fred
K3FRK


Bill Somerville
 

On 13/05/2021 12:40, Fred Kepner wrote:
John,

Regarding the shift, the VFO frequency remains constant on my FT-DX3000 between transmit and receive.  I would check two things:

1)  Make sure you aren't in Hound Mode.
2)  On the settings tab, check that split operation is turned off.

I had the same problem recently with a different Yaesu radio.  I use two different profiles, one for normal FT8 and one for F/H FT8.  I changed split to off for the normal FT8 profile and the problem was fixed.

73
Fred
K3FRK
Fred,

the way WSJT-X uses a different VFO dial frequency for Tx is not a problem that needs solving, it is an important feature that ensures your signal is as clean as possible, which also allows you to transmit with full power at any Tx audio offset.

73
Bill
G4WJS.


chas cartmel
 

Mine does as well, as it should when the audio component of the sent transmission falls outside the optimal passband of the transceiver. This is to ‘push it back’ to where it is within said passband. WSJT set to split.
It’s in the manual.

 

 

73 Charlie

G4EST

www.g4est.me.uk

Stay safe out there

 

 

From: main@WSJTX.groups.io [mailto:main@WSJTX.groups.io] On Behalf Of Fred Kepner
Sent: 13 May 2021 12:41
To: main@WSJTX.groups.io
Subject: Re: [WSJTX] Frequency shifts down 500KHz on transmit #FT8

 

John,

Regarding the shift, the VFO frequency remains constant on my FT-DX3000 between transmit and receive.  I would check two things:

1)  Make sure you aren't in Hound Mode.
2)  On the settings tab, check that split operation is turned off.

I had the same problem recently with a different Yaesu radio.  I use two different profiles, one for normal FT8 and one for F/H FT8.  I changed split to off for the normal FT8 profile and the problem was fixed.

73
Fred
K3FRK


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Paul Turner
 

You should NOT turn split off. You need Split or “Fake It” to ensure a clean TX signal, unless you only every TX above 1500Hz.

 

73, Paul G4IJE.

 

 

From: main@WSJTX.groups.io <main@WSJTX.groups.io> On Behalf Of Fred Kepner
Sent: 13 May 2021 12:41
To: main@WSJTX.groups.io
Subject: Re: [WSJTX] Frequency shifts down 500KHz on transmit #FT8

 

John,

Regarding the shift, the VFO frequency remains constant on my FT-DX3000 between transmit and receive.  I would check two things:

1)  Make sure you aren't in Hound Mode.
2)  On the settings tab, check that split operation is turned off.

I had the same problem recently with a different Yaesu radio.  I use two different profiles, one for normal FT8 and one for F/H FT8.  I changed split to off for the normal FT8 profile and the problem was fixed.

73
Fred
K3FRK


Virus-free. www.avast.com


Bill Somerville
 

On 12/05/2021 21:34, John wrote:
Everything was working great, WSJTX, JTAlert and HRD LogBook.
Then there were no decodes the next operating session, no Windows updates to interfere.

I hear and see loads of signals but no activity is shown in the RX pane, the DECODE light flashes now and then, but still no decodes.

I have to confess, I didn't really notice if this is normal for the VFO to shift 500KHz down on transmit, is this normal?

Any help would be appreciated.

FTdx-3000, Yaesu web site drivers, Win 10 Ver 20H2, OS build 19042.964

Thanks,
John
VE7KKQ
Hi John,

it is normal for WSJT-X to shift the Tx VFO dial frequency according to the Tx audio offset you choose, it is done to ensure your signal is as clean and free from audio harmonics as possible. The on-air frequency of your signal is not affected as WSJT-X compensates by adjusting the Tx audio tone frequencies.

A lack of any  decodes is usually down to one of two factors:

1) you are using the wrong sideband, WSJT-X expects USB for Tx and Rx,

2) your PC time is not well enough synchronized to UTC, within 1.5 seconds is sufficient for all modes in WSJT-X. Nn MS Windows that does not happen automatically and you need to install a tool to do that for you. Installing a tool like the Meinberg NTP Client (as suggested in the WSJT-X User Guide installation instructions for MS Windows) will get that done for you.

73
Bill
G4WJS.


Dave (NK7Z)
 

John,

Yes, having the transmit move around, (assuming you have some form of split turned on), is normal. Your rig will shift around in transmit frequency, (slightly, Hz., not KHz.), depending on where your transmit tick mark is set in the waterfall. This is a good thing, not to worry.

The above triages out the shifting issue, leaving only the no decode problem...

I would check a few things:

1. Clock; make sure the date/time are close. They do not need to be close to within a few ms, just within 250 ms or so, to get decodes. I get decodes 1.5 seconds off, now and then, but don't like to run it that way.

2. Levels; make sure you are not hammering, or depriving, the computer of sounds. You can go to your computer audio device page, (assuming Windows 10), and look at a meter showing input levels. I set my system up so that the levels feeding the computer, with a decent signals are around 75% to 85% of full. Level setting is an entirely different subject that I don't want to get into here... Just make sure you are not hammering, or depriving the computer of audio as it leaves your radio. You should see signals on the waterfall. If you do, then you are probably close or correct for your setup, and you should see decodes. The thermometer bar in WSJT-X runs about 35-55% on my system with no signal. I have my AGC set to slow, and I have it set to not kick in until I see a strong signal. That lets me run with no AGC, if there are only weak stations on, and if a local blasts in, I don't loose an eardrum.

3. Mode; make sure you are in the right mode.

4. Report back if these helped, or did nothing...

73, and thanks,
Dave (NK7Z)
https://www.nk7z.net
ARRL Volunteer Examiner
ARRL Technical Specialist, RFI
ARRL Asst. Director, NW Division, Technical Resources

On 5/12/21 1:34 PM, John wrote:
Everything was working great, WSJTX, JTAlert and HRD LogBook.
Then there were no decodes the next operating session, no Windows updates to interfere.
I hear and see loads of signals but no activity is shown in the RX pane, the DECODE light flashes now and then, but still no decodes.
I have to confess, I didn't really notice if this is normal for the VFO to shift 500KHz down on transmit, is this normal?
Any help would be appreciated.
FTdx-3000, Yaesu web site drivers, Win 10 Ver 20H2, OS build 19042.964
Thanks,
John
VE7KKQ


Fred Kepner
 

Thanks for the clarification Bill, I didn't realize this.  Perhaps I read it in the manual years ago and forgot, no idea.

I no longer have my FT-DX3000.  When I did, it was correctly set to "Fake it" but in 3 years of daily operation, I never once noticed the VFO changing frequencies when transmitting unless I was in F/H.  I guess it did, I just didn't see it.  When I noticed my new radio doing it while set to "fake it", I thought it was outside the realm of normal behavior.

This is why I read these threads, helpful info via community support.  FB.

73
Fred
K3FRK


John
 

Thank you Bill and Dave, I'll try the suggested fixes/checks and report back, I think Bill you nailed it, timing, after my computer fried, literally, I haven't installed or set the clock synchronization.

XYL working this poor 70 year old hard in the garden, just woke up from a power nap, if I can stay awake, focused and have a wit or two about me, I'll check it out tonight.

Stay safe all...

John
VE7KKQ


On Thu, May 13, 2021 at 2:24 PM Fred Kepner <kepnerf@...> wrote:
Thanks for the clarification Bill, I didn't realize this.  Perhaps I read it in the manual years ago and forgot, no idea.

I no longer have my FT-DX3000.  When I did, it was correctly set to "Fake it" but in 3 years of daily operation, I never once noticed the VFO changing frequencies when transmitting unless I was in F/H.  I guess it did, I just didn't see it.  When I noticed my new radio doing it while set to "fake it", I thought it was outside the realm of normal behavior.

This is why I read these threads, helpful info via community support.  FB.

73
Fred
K3FRK



John
 

Well, stayed "with it" long enough to install Meinberg NTP, Bill, Dave and the others nailed it, decodes calore now, thank you all so very much for the help.

Stay safe and I'm counting on putting you all in my log... and get the shot/jab, got mine.

John
VE7KKQ


On Thu, May 13, 2021 at 4:40 PM John Hill <ve3kkqve3kkq@...> wrote:
Thank you Bill and Dave, I'll try the suggested fixes/checks and report back, I think Bill you nailed it, timing, after my computer fried, literally, I haven't installed or set the clock synchronization.

XYL working this poor 70 year old hard in the garden, just woke up from a power nap, if I can stay awake, focused and have a wit or two about me, I'll check it out tonight.

Stay safe all...

John
VE7KKQ

On Thu, May 13, 2021 at 2:24 PM Fred Kepner <kepnerf@...> wrote:
Thanks for the clarification Bill, I didn't realize this.  Perhaps I read it in the manual years ago and forgot, no idea.

I no longer have my FT-DX3000.  When I did, it was correctly set to "Fake it" but in 3 years of daily operation, I never once noticed the VFO changing frequencies when transmitting unless I was in F/H.  I guess it did, I just didn't see it.  When I noticed my new radio doing it while set to "fake it", I thought it was outside the realm of normal behavior.

This is why I read these threads, helpful info via community support.  FB.

73
Fred
K3FRK