As much as they are allowed and very high gain antennas too. LARGE ERP. 😊



Outlook LT Gil W0MN

Hierro Candente Batir de Repente

44.08226 N 92.51265 W EN34rb

Yes, SERIOUSLY. It's a weak-signal mode, not necessarily a QRP mode.

EME is weak signal, but how much power do they use there?

Vy 7 3
Earl / KD5XB
DM84

Antenna gain is also a factor. 10 Watts to a simple dipole or vertical is different than 10 Watts to an aluminum stack on an aviation hazard tower. And then there is also the noise floor at the other end...

73

-Jim
NU0C

On Sat, 3 Dec 2022 17:56:44 -0600
"Gilbert Baron" <w0mn00@...> wrote:

True up to a point but if you are +6 and the other is - 20, who do you think gets called first? Does this mean I cannot use by 4 element Yagi at 70 feet? Oh well, I do not have that 😊



Outlook LT Gil W0MN

Hierro Candente Batir de Repente

44.08226 N 92.51265 W EN34rb





-----Original Message-----
From: main@WSJTX.groups.io <main@WSJTX.groups.io> On Behalf Of Ron
Sent: 03 December 2022 16:55
To: main@WSJTX.groups.io
Subject: Re: [WSJTX] Option to filter weak stations from display? #WSJTX_config



On Thu, Nov 24, 2022 at 10:48 AM, Michael Black wrote:

Why are you limiting yourself to 10W? Rig limit?You'd get more than

9dB on your transmit going to 100W.

100 watts on FT-8, seriously??



Most hams I know run anything from QRP to 35 watts. 100 watts is waaaay overkill.



FT-8 is a weak signal mode, which while it does not mean QRP mode, it does mean that wsjt can copy signals when you see nothing at all on the waterfall display. It can pull signals down at the noise floor that you can't even hear much less see on the display so 100 watts is a ridiculous amount of power read the manual.



Ron - KJ5XX

You might want to watch this video:  https://youtu.be/gtY2d4eSmm8. They make it pretty clear about power settings for this mode.  In a nutshell,  if the station you are calling doesn't answer,  increase power. 73,Mike,  AE8USent from my T-Mobile 5G Device

True up to a point but if you are +6 and the other is - 20, who do you think gets called first? Does this mean I cannot use by 4 element Yagi at 70 feet? Oh well, I do not have that 😊



Outlook LT Gil W0MN

Hierro Candente Batir de Repente

44.08226 N 92.51265 W EN34rb

On Thu, Nov 24, 2022 at 10:48 AM, Michael Black wrote:

Why are you limiting yourself to 10W?  Rig limit?You'd get more than 9dB on
your transmit going to 100W.

100 watts on FT-8, seriously??

Most hams I know run anything from QRP to 35 watts. 100 watts is waaaay overkill.

FT-8 is a weak signal mode, which while it does not mean QRP mode, it does mean that wsjt can copy signals when you see nothing at all on the waterfall display. It can pull signals down at the noise floor that you can't even hear much less see on the display so 100 watts is a ridiculous amount of power read the manual.

Ron - KJ5XX

I don’t get it. You can limit the decode to CQ calls; why isn’t that enough?

A weak signal one minute (say -21 dB) could easily be a stronger signal (say -19 dB) a moment later. The weak CQ you filter out could easily be the DX call from Yehupetz that you have been waiting to nab.

73
Bob Rose
robert.rose@...
KN6UXD
DM13ld

On 12/2/2022 5:19 AM, Michael Black via groups.io wrote:

80dB here is a touch too hot for my taste.  It's dangerously close to clipping hitting 0dB very quickly with AGC slow.75dB works at -3dB which is doable.  I was keeping it at -6dB.  I've got my peak level meter on permanent hold now so can see where the max level is.I think we need to adjust the "red" level on the WSJT-X meter to maybe 80dB which I don't see clipping but would be the max one would want I think.

You're right that it's important to watch levels as we operate when set at this high level, and reduce RF gain if the green bar turns red, or if distortion is observed as thin vertical lines in the waterfall. That 10 dB difference is two S-units of weaker stations we hear or not.

73, Jim K9YC

80dB here is a touch too hot for my taste.  It's dangerously close to clipping hitting 0dB very quickly with AGC slow.75dB works at -3dB which is doable.  I was keeping it at -6dB.  I've got my peak level meter on permanent hold now so can see where the max level is.I think we need to adjust the "red" level on the WSJT-X meter to maybe 80dB which I don't see clipping but would be the max one would want I think.



Mike W9MDB

By the way is that filtering in JTAlert settable so that messages to you are not filtered out independently of the signal strength?

Yes it is. The filtering applies to individual display panels. You can have one panel wide open with all decoded callsigns, one panel with just those calling you, another panel with only strang sigs. Up to 7 panels are possible each displaying subsets of the decoded callsigns based on the requirements.

Thanks Laurie!

Excellent logic in your program! Perhaps I also should use it. Well, currently mostly QRT.

73, Reino OH3mA

On 12/1/2022 1:10 PM, Michael Black via groups.io wrote:

My current recommendation for FT8 is to run the Rx audio levels at around 70dB on a quiet spot with AGC on slow.

My recommendation is a bit different -- as close as practical to 80 WITH signals present, and with AGC Slow. I've been running this way for 3-4 years.

73, Jim K9YC

On 02/12/2022 5:21 pm, Reino Talarmo wrote:

By the way is that filtering in JTAlert settable so that messages to you are not filtered out independently of the signal strength?

Yes it is. The filtering applies to individual display panels. You can have one panel wide open with all decoded callsigns, one panel with just those calling you, another panel with only strang sigs. Up to 7 panels are possible each displaying subsets of the decoded callsigns based on the requirements.

de Laurie VK3AMA
(JTAlert author)

I filter out signals below -15dB because I typically receive reports 15-20dB lower than I give.

Nevertheless, achieved 8 Band WAS in a few months on FT8 after moving to new QTH.

Hi Jim,

It is your choice and is fine as long as you never call CQ! There could be eager QRP stations returning to your CQ and will be filtered out. Those could be even rare DX stations, hi!

You are not using the "WS" "weak signal" part of the program, are you.

By the way is that filtering in JTAlert settable so that messages to you are not filtered out independently of the signal strength? If so it would be fine and my comment is no more totally fair.

73, Reino OH3mA









-----Original Message-----
From: main@WSJTX.groups.io <main@WSJTX.groups.io> On Behalf Of Bill Benham
Sent: Thursday, December 1, 2022 11:56
To: main@WSJTX.groups.io
Subject: Re: [WSJTX] Option to filter weak stations from display? #WSJTX_config

Yes I had already tried setting RF gain as low as it will go. (1%) My antennas should be good -- all are resonant and match the coax so SWRs are 1.5 or better and I don't ever use the tuner. I usually don't receive as good a report as I what I send, because I only run 5 to 10 watts.

Can anybody explain why the RF gain setting appears to have so little effect? I can set it at 1 or 100 and signals don't change much.

--
W4XAX

If you use JTAlert, you can set up a window where you set the minimum SNR.
I filter out signals below -15dB because I typically receive reports 15-20dB lower than I give.
Nevertheless, achieved 8 Band WAS in a few months on FT8 after moving to new QTH.
____________
73,
Jim - N4ST

You have AGC on?

My current recommendation for FT8 is to run the Rx audio levels at around 70dB on a quiet spot with AGC on slow.

This has been working wonderfully for lots of us.
Mike W9MDB

Can anybody explain why the RF gain setting appears to have so little effect? I can set it at 1 or 100 and signals don't change much.

Hi Bill,
I may try. On HF, especially on the lower part, band noise is quite strong and the noise of rig has only a minor effect. When you change RF gain, then both the signals and the band noise go down. But the S/N ratio stays almost the same. Of course it depends on the rig how much attenuation RF gain adjustment provides. So WSJT-X can easily decode all but weakest signals, where rig noise starts to affect. In that sense this kind of "filtering" does not work, hi".
I would just try to work station with a low S/N, you never know how much power they are using. Even more a strong station may have also a strong band noise and you cannot get through.

73, Reino OH3mA

My little G90 radio is capable of 20 watts peak but on digital modes it's probably not good in terms of heating up the final stage so I just run 10 watts or less. I have a 4 element yagi so that more than makes up for the low power. Having fun working ZL and ZS6 with just 10 watts!

--
W4XAX

Yes I had already tried setting RF gain as low as it will go. (1%) My antennas should be good -- all are resonant and match the coax so SWRs are 1.5 or better and I don't ever use the tuner. I usually don't receive as good a report as I what I send, because I only run 5 to 10 watts.

Can anybody explain why the RF gain setting appears to have so little effect? I can set it at 1 or 100 and signals don't change much.

--
W4XAX

Simple solution? - AGC off, back off RF Gain.
Better still, improved receiver and antenna performance can result in stronger or more importantly, "quieter" signals (better s/n) on your display. Maybe they are hearing you but you're not hearing their replies!

Chuck
WV8A

On 25/11/2022 3:13 am, Reino Talarmo wrote:

Running Windows 10 and never more than 10 watts. Would like to have the option to filter weak signals from the display -- maybe all with negative dB -- because I have never been able to establish contact with one of them and it would be a great benefit in terms of decluttering. As far as I have seen, this option does not now exist.

Hi Bill,

Perhaps JTAlert has even that possibility.

Yes it does! It offers two SNR based displays, weak or strong, based on a user-settable db value.

de Laurie VK3AMA
(JTAlert author)