Re: [wsjt-devel] A strange signal seen on the air

settings are in the teens. Dave / NX6D From: Black Michael via wsjt-devel Sent: Thursday, August 2, 2018 6:00:46 AM To: WSJT software development Cc: Black Michael Subject: Re: [wsjt-devel] A strange signal seen on the air Maybe you're not aware...but

Re: [wsjt-devel] A strange signal seen on the air

I run with a 4K wide RX and TX passband in DIGU mode, which bypasses all audio signal processing.   Dave / NX6D     From: Carey Fisher Sent: Wednesday, August 1, 2018 8:29:05 PM To: WSJT software development Subject: Re: [wsjt-devel] A strange signal seen on the air Well, duh... On Wed,

Re: [wsjt-devel] A strange signal seen on the air

4K wide RX and TX passband in DIGU mode, which bypasses all audio signal processing. Dave / NX6D From: Carey Fisher Sent: Wednesday, August 1, 2018 8:29:05 PM To: WSJT software development Subject: Re: [wsjt-devel] A strange signal seen on the air Well, duh

Re: [wsjt-devel] A strange signal seen on the air

Well, duh... On Wed, Aug 1, 2018 at 7:45 PM, G8DQX (WSJT developers on SF) < wsjtde...@gape.me.uk> wrote: > When the TX is not employing CAT control of frequency, for starters. > > Robin > > On 01/08/18 18:55, Carey Fisher wrote: > > Name 1. > > On Wed, Aug 1, 2018 at 1:35 PM, Black Michael via w

Re: [wsjt-devel] A strange signal seen on the air

When the TX is not employing CAT control of frequency, for starters. Robin On 01/08/18 18:55, Carey Fisher wrote: Name 1. On Wed, Aug 1, 2018 at 1:35 PM, Black Michael via wsjt-devel > wrote: Because there are too many situations where it doesn'

Re: [wsjt-devel] A strange signal seen on the air

I don't believe it was due to the bandpass limits in the radios in question (my recollection is that as the audio frequency went down the drive level required for a given RF output level went up and this effect was fairly constant thru the audio pass band as opposed to only happening at high or

Re: [wsjt-devel] A strange signal seen on the air

If you're needing different levels at 500 or 2500 then you are probably hitting the bandpass limits you have set on your rig.Levels SHOULD be constant across your entire transmit bandpass.I can imagine 2500 might be a push for an older rig but 500 shouldn't be. de Mike W9MDB On Wednesd

Re: [wsjt-devel] A strange signal seen on the air

Just to add to this: In my experience it is also helpful to carry out this type of test procedure at various audio frequencies within the audio pass band of the equipment in question. This is probably another good reason to run "CAT" control along with "Split" so that the audio frequencies tha

Re: [wsjt-devel] A strange signal seen on the air

To All, It's great to see all of the posts reviewing how to set audio correctly. I was wondering if there's a published spec on the FT8 signal definition; I think I may be seeing spurs and want to make sure that isn't actually part of the fundamental. 73's, John AJ6BC On Wed, Aug 1, 2018, 11:42

Re: [wsjt-devel] A strange signal seen on the air

Good instructions for the analog world. There's one more way that works on most any computer these daysEven people with direct USB connections to their rigs are having problems. I would add this...and it should work on most any rig setup #1 Set WSJT-X to minimum power#2 Set audio devices

Re: [wsjt-devel] A strange signal seen on the air

rig? > > Making it the default would help clean up our waterfalls. > > > > Sent from XFINITY Connect Mobile App > > > -- Original Message -- > > *From: *iveydj > *To: *WSJT software development > *Sent: *August 1, 2018 at 9:45 AM > *Subject: *Re: [ws

Re: [wsjt-devel] A strange signal seen on the air

On 8/1/2018 9:50 AM, Black Michael via wsjt-devel wrote: IMHO better if ops learn how to set up their rigs properly though. Exactly right. The last page of this link has detailed instructions for setting audio levels that avoids distortion. http://k9yc.com/USB_Interfaces.pdf 73, Jim K9YC -

Re: [wsjt-devel] A strange signal seen on the air

t audio harmonics are out of the TX passband, supressing them.  Dave KE4EA Sent from my Sprint Samsung Galaxy Note5. Original message From: Claude Frantz Date: 7/31/18 12:29 PM (GMT-05:00) To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] A strange signal seen on

Re: [wsjt-devel] A strange signal seen on the air

12:29 PM (GMT-05:00) To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] A strange signal seen on the air On 07/31/2018 05:18 PM, Black Michael via wsjt-devel wrote:Many thanks Mike and George. I confess that I'm surprised. I willobserve these signals further if they occur. It's

Re: [wsjt-devel] A strange signal seen on the air

nics are out of the TX passband, supressing them.  Dave KE4EA Sent from my Sprint Samsung Galaxy Note5. Original message From: Claude Frantz Date: 7/31/18 12:29 PM (GMT-05:00) To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] A strange signal seen on the air On 0

Re: [wsjt-devel] A strange signal seen on the air

.  Dave KE4EA Sent from my Sprint Samsung Galaxy Note5. Original message From: Claude Frantz Date: 7/31/18 12:29 PM (GMT-05:00) To: wsjt-devel@lists.sourceforge.net Subject: Re: [wsjt-devel] A strange signal seen on the air On 07/31/2018 05:18 PM, Black Michael via wsjt

Re: [wsjt-devel] A strange signal seen on the air

On 08/01/2018 02:37 AM, David Tiller wrote: Hi Dave & All, > As promised, here's an example of 1st thru 7th harmonics. If you can't > see the pic inline, try > here: https://drive.google.com/open?id=15NRQ2WUkjZLH-yI--HqqjblNjc4vNv-k > > Frequencies are approximate.  I can imagine that such sign

Re: [wsjt-devel] A strange signal seen on the air

Bill, The distortion and harmonics are in the audio section, which when over driven are no longer linear.  The harmonics that you are seeing are audio,, not RF.  The RF signal is still linear. Hal W5GHZ Sent from Yahoo Mail. Get the app On ‎Tuesday‎, ‎July‎ ‎31‎, ‎2018‎ ‎10‎:‎38‎:‎09‎ ‎PM

Re: [wsjt-devel] A strange signal seen on the air

Heavy clipping causes (almost a square wave) which produces odd harmonics.  Very light clipping (not so square) may also include some even harmonics.  If you look at the signal with an O-scope, it is easy to see. Hal W5GHZ Sent from Yahoo Mail. Get the app On ‎Tuesday‎, ‎July‎ ‎31‎, ‎2018

Re: [wsjt-devel] A strange signal seen on the air

On 31/07/2018 16:18, Black Michael via wsjt-devel wrote: Sometimes you see the 2nd and sometimes the 3rd (and once I've seen the 4th).  Depends on how well the rig suppresses the 2nd harmonic. Hi Mike, I don't understand how you come to the conclusion that the rig could suppress a 2nd harmon

Re: [wsjt-devel] A strange signal seen on the air

On 31/07/2018 16:07, Claude Frantz wrote: OK ! We can suspect a clipping, in the audio range, resulting in this signal at 2830 Hz. But there is no 2nd harmonic at 1880 Hz on this waterfall. Of course, such a clipping resulting only in odd harmonics is possible, but it would be surprising to me. F

Re: [wsjt-devel] A strange signal seen on the air

I have been thinking about this for some time.  Went through the setup again and things set up different now.  Would anyone be willing to give me a call and take a look at my signal.   Hal W5GHZ  405-974-0760  anytime  Sent from Yahoo Mail. Get the app On ‎Tuesday‎, ‎July‎ ‎31‎, ‎2018‎ ‎10

Re: [wsjt-devel] A strange signal seen on the air

On 07/31/2018 05:18 PM, Black Michael via wsjt-devel wrote: Many thanks Mike and George. I confess that I'm surprised. I will observe these signals further if they occur. It's an interesting matter. Hi ! Best wishes, Claude (DJ0OT) ---

Re: [wsjt-devel] A strange signal seen on the air

Actually the noise correlates perfectly with the signal at 940...look again...the top :45 entry chops off about half way through the interval and the noise goes with itplus the fact that the math works out perfectly with the 150Hz wide noise being 3*50. I contacted that op and worked with hi

Re: [wsjt-devel] A strange signal seen on the air

Hi Claude. I think Mike´s interpretation is correct. Third harmonics are often stronger than the 2nd, and the variation in signal strength does seem to match the fundamental (which, BTW, is not the TX/RX selected DF). I see this quite frequently. A lot of hay is made on the Facebook group and

Re: [wsjt-devel] A strange signal seen on the air

On 07/31/2018 04:38 PM, Black Michael via wsjt-devel wrote: Hi Mike & All, > The signals look clean but they are the result of clipping the signal > due to overdriving the audio. > Like this one...3rd harmonic at 2830 or so...offending signal at 940 or > so... OK ! We can suspect a clipping, in

Re: [wsjt-devel] A strange signal seen on the air

On 07/31/2018 03:01 PM, Black Michael via wsjt-devel wrote: > That's harmonics.  If it's 100Hz wide it's the 2nd harmonic, 150Hz wide > it's the 3rd,. The signals, I have seen, have 8 tones within 100 Hz. Approximatively, of course, because I report only what I have seen on the waterfall. The

Re: [wsjt-devel] A strange signal seen on the air

Claude, That sounds a lot like a dirty FT8 signal that has second (and possibly higher) harmonics. I have a screenshot of a signal with seven (yes 7) higher order harmonics. > On Jul 31, 2018, at 06:07, Claude Frantz wrote: > > Hi All, > > Sometimes, I have seen a strange signal on the air

Re: [wsjt-devel] A strange signal seen on the air

That's harmonics.  If it's 100Hz wide it's the 2nd harmonic, 150Hz wide it's the 3rd,. Been seeing them a lot and you can divide the starting offset by 2 or 3 as appropriate and find out who's doing it. Quite a few ops overdriving their audio.  Been more of them since Baker Island with the o

[wsjt-devel] A strange signal seen on the air

Hi All, Sometimes, I have seen a strange signal on the air, in the usual FT8 "sub band". There are 8 tones in a bandwidth of 100 Hz and a TX duration of 15 s. Is this a CLOVER signal or anything else ? Best wishes, Claude (DJ0OT) --