Date   

Re: 3D waterfall

jdow
 

I suppose they made it too simple for a lid to overdrive the transmitter. Or perhaps he is over driving his 10 kW transmitter. This is part of the reason I've been remarkably inactive lately.
{o.o}

On 20210704 20:00:29, Kriss Kliegle KA1GJU wrote:
I just wish operators of FTDX10's could learn how NOT to QRM the band!
I have found ONLY ONE user of the FTDX10 that did NOT have a lousy signal...

Exhibit A:



The IC-7300's always have a nice 3kHz signal.

Just my humble observations.

73 Kriss KA1GJU


Re: 3D waterfall

Simon Brown
 

Ah,

 

Shame – the FTDX-10 has a different PA module to the FTDX-101, I was hoping it would be clean .

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kriss Kliegle KA1GJU
Sent: 05 July 2021 04:00
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall

 

I just wish operators of FTDX10's could learn how NOT to QRM the band!
I have found ONLY ONE user of the FTDX10 that did NOT have a lousy signal...

Exhibit A:



The IC-7300's always have a nice 3kHz signal.

Just my humble observations.

73 Kriss KA1GJU


--
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Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: 3D waterfall

Kriss Kliegle KA1GJU
 

I just wish operators of FTDX10's could learn how NOT to QRM the band!
I have found ONLY ONE user of the FTDX10 that did NOT have a lousy signal...

Exhibit A:



The IC-7300's always have a nice 3kHz signal.

Just my humble observations.

73 Kriss KA1GJU


Re: SDRC & SDRPlay RSPdx S-Meter Study

Gedas
 

Beyond the scope of my current interests.....I will let someone else do that if they like.

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 9:10 PM, jdow wrote:

Modulate the test signal. Try NFM with varying modulation frequencies and levels. The S-Meter's performance may lead you to some interesting conclusions. At one time I could make an NFM signal vanish on the S-Meter. I don't know if Simon has fixed that "feature".

{^_^}

On 20210704 11:32:14, Gedas wrote:

Yes, TU....that is ONE possibility of settings for somewhat accurate s-meter readings.

But also a good take away was that pretty much most of the setting variants indicated that a 10 dB change in input level did correspond to a 10 dB change in s-meter.

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 2:22 PM, Siegfried Jackstien wrote:

i have seen the video

summarize ... set rf gain to 27db (max sensitivity), if gain to - 35db (not overdrive next stages) , visual gain to -40 db (calibrate s-meter)... and your readout should be good to plusminus 1 db or so ... between -130dbm and -50dbm!!

base noise then is at around -145dbm (from what i could see in the video) ... so a -140dbm signal is still clearly 5 db over the base noise

.....

what i do on any sdr... i set the gain (rf gain and if gain)  that the base noise just BARELY lifts up ... to have the max sensitivity ... and then with visual gain i set it that the s meter readings are ok (do match the real level) ...

most sdr are quite accurate in readings (as you found out with your signal generator)

why the rspdx needs a minus 75 db correction downwards (if gain and visual gain summed up) ... ok that how it is done in THIS sdr (others sure need different settings)

gedas ... a question ... can you try to set visual gain lower and increase if gain .. or set if gain lower and increase visual gain ... and have the same results??

does the rspdx overdrive on a setting?? (sure it does depending what level you throw at it) ... at what level with what settings??

means try to find a setup with max sensitivity and high dynamic range before overdriving ... try different combinations of visual gain and rf gain to find the best compromize and then let it there

plus ... you can do that also on vhf and uhf (and maybe find complete different numbers)

next is ... if you set your receiving a  bit sideways from centre ... do you see "ghost" signals?? (a mirror of the main signal or mixing products)??

pull the "high" slider in spectrum a bit upwards (to see those high peaks also with -50dbm or higher without going "out of sight" at the top)

greetz sigi dg9bfc


Am 04.07.2021 um 19:07 schrieb Gedas:

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDRC & SDRPlay RSPdx S-Meter Study

Gedas
 

I guess it is a good thing an ex-tempest engineer took the data :-)

(have no fear, no unintentional RF leakage or coupling).

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 8:55 PM, jdow wrote:

Showing the raw data would be nice. There are a  lot of analog RF effects that could upset the reporting, most notably cable leakage.

{^_^}

On 20210704 10:07:38, Gedas wrote:

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDRC & SDRPlay RSPdx S-Meter Study

jdow
 

Modulate the test signal. Try NFM with varying modulation frequencies and levels. The S-Meter's performance may lead you to some interesting conclusions. At one time I could make an NFM signal vanish on the S-Meter. I don't know if Simon has fixed that "feature".

{^_^}

On 20210704 11:32:14, Gedas wrote:

Yes, TU....that is ONE possibility of settings for somewhat accurate s-meter readings.

But also a good take away was that pretty much most of the setting variants indicated that a 10 dB change in input level did correspond to a 10 dB change in s-meter.

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 2:22 PM, Siegfried Jackstien wrote:

i have seen the video

summarize ... set rf gain to 27db (max sensitivity), if gain to - 35db (not overdrive next stages) , visual gain to -40 db (calibrate s-meter)... and your readout should be good to plusminus 1 db or so ... between -130dbm and -50dbm!!

base noise then is at around -145dbm (from what i could see in the video) ... so a -140dbm signal is still clearly 5 db over the base noise

.....

what i do on any sdr... i set the gain (rf gain and if gain)  that the base noise just BARELY lifts up ... to have the max sensitivity ... and then with visual gain i set it that the s meter readings are ok (do match the real level) ...

most sdr are quite accurate in readings (as you found out with your signal generator)

why the rspdx needs a minus 75 db correction downwards (if gain and visual gain summed up) ... ok that how it is done in THIS sdr (others sure need different settings)

gedas ... a question ... can you try to set visual gain lower and increase if gain .. or set if gain lower and increase visual gain ... and have the same results??

does the rspdx overdrive on a setting?? (sure it does depending what level you throw at it) ... at what level with what settings??

means try to find a setup with max sensitivity and high dynamic range before overdriving ... try different combinations of visual gain and rf gain to find the best compromize and then let it there

plus ... you can do that also on vhf and uhf (and maybe find complete different numbers)

next is ... if you set your receiving a  bit sideways from centre ... do you see "ghost" signals?? (a mirror of the main signal or mixing products)??

pull the "high" slider in spectrum a bit upwards (to see those high peaks also with -50dbm or higher without going "out of sight" at the top)

greetz sigi dg9bfc


Am 04.07.2021 um 19:07 schrieb Gedas:

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDRC & SDRPlay RSPdx S-Meter Study

jdow
 

Showing the raw data would be nice. There are a  lot of analog RF effects that could upset the reporting, most notably cable leakage.

{^_^}

On 20210704 10:07:38, Gedas wrote:

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: Recordings Stuttering

jdow
 

It's not an easy subject to wrap your mind around. I'm sure I am not the be all and end all of knowledge here. But, this is a bullet I bit with my first USB toy, a USB 1.1 something that my then USB 1.0 keyboard slowed down. (As you get older you get more and more "it didn't work" or the occasional "it did work" that stick in the mind.)

{^_-}

On 20210704 05:13:33, James Niven wrote:

Thanks, Jdow, I appreciate your insight and knowledge.

 

So, I feel kind of goofy now. I was curious as to the actual usb ports on desktop computer. On the front there are 2 usb2 black tongue ports, but on the rear of the computer, wait for it…..4 usb3 ports with the blue tongue and 2 usb2 ports with the black tongue.

I did not realize I had these on the rear, it would have saved me a lot of headaches. So, I need to purchase a usb3 hub to allow easy access to plug in my external hard drive with saved sdr console files for playback rather than moving the desktop every time to plugging in my external hard drive. I plugged my external HD into the usb3 port and played my files on sdr console, no problems, no stutter what so ever.

 

Thanks

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Sunday, July 4, 2021 5:52 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Recordings Stuttering

 

Depending on what you want to do the "expensive" route is a card with more than one controller on it. By controller I mean a device that speaks to the computer busses directly say via a PCIe socket. I do not mean a controller followed by a hub to split it into for USB 3 sockets. The four controller card I have (closer to $300 than $100) has four controllers so I could in theory have four USB 3.1 transfers going on simultaneously at very near the peak speed capability of the four USB 3.1 busses added together. The limit would be the PCIe bus I believe. With that running a pair of AirSpy R2 devices at full 10 MHz is easy. If OTHER aspects of the computer could support it a pair of R888s at full 64 (or so) MHz wide sets of samples could be processed at the same time. (That might be sufficient to get my computer to roll over and die, though. If not I have disks I could put on the other two USB ports to capture the data. I don't think that would work, especially after the speculative execution slowdowns in the current INTEL kernel downgrades due to security vulnerabilities.)

{^_^}

On 20210704 03:28:39, James Niven wrote:

So, with a little googling, it seems I can add a usb card to my desktop computer with usb3.0 ports, this may be a solution.

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of James Niven
Sent: Sunday, July 4, 2021 5:21 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Recordings Stuttering

 

Thanks, but the answer is no according to this article, its based on the port on the laptop/computer to start with.

https://www.sweetwater.com/sweetcare/articles/how-do-i-know-if-my-computer-has-usb-3-0-ports/

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of James Niven
Sent: Sunday, July 4, 2021 5:12 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Recordings Stuttering

 

Thanks very much jdow, for your very detailed information.

Just a thought, are there adaptors that can plug into a say a usb2 port and convert it to a usb3 port or will there be no difference??

Thanks again

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow
Sent: Saturday, July 3, 2021 9:11 PM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Recordings Stuttering

 

Ah, nope - if you have all USB2 devices on the bus a USB3 port is not a solution except MAYBE in very marginal cases. If the ELAD is USB 3 (blue tongues) then it may make a major difference. (White tongues are USB 2. Wikipedia has at least one article that delineates what the tongue colors mean.)

If the ELAD itself works on USB2 with all the usual "stuff" on USB 2 then a laptop with some USB3 and some USB2 sockets should work a treat.

{^_^}

On 20210703 18:45:53, James Niven wrote:

Hi Nick,

 

Thanks for this information, I actually forgot how to get to the “write-caching” properties to make sure nothing had changed, thanks for that.

I did set this way back when I brought the external hard drive, I just checked the settings and yep, still good.

 

It’s funny, I use the same external hard drive on my overnight recordings from Jaguar Pro and have no issues with the recordings.

It only seems to be with SDR Console when recording FM frequencies and store for later playing that I find the stuttering.

It seems to be what Max and Joanne suggest, the usb 2 port, should be usb 3 for better transmission of data.

 

Thanks

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Nick Hall-Patch
Sent: Saturday, July 3, 2021 6:52 PM
To: main@SDR-Radio.groups.io; main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Recordings Stuttering

 

Is this the age-old "write-caching" problem, James?  It snags me every year or two.

Bring up Properties for your drive in (right-click on it in Explorer), Hardware tab, highlight the drive, Properites again,  "Change Settings", Policies.

In Removal Policy, choose "Better Performance", and enable Write Caching.

I hope I'm not stating the obvious, hi.  (just because it's never obvious to me..)


best wishes,

Nick



At 21:17 2021-07-03, James Niven wrote:


Hi Group,
 
I am trying to work out why my recordings are stuttering on playback when accessing them from an external hard drive.

There seems to be no issue from what I can see when playing them back when I record to c: drive.
 

So, it appears to be an external drive issue maybe or a setting. I have SDR console version 3.0.28, I am recording the FM band at 6.144mhz bandwidth with my elad s2.

Any tips on what I should look for? I have had this before, but I was never able to fix the issue.

 

Thanks



James Niven

Austin, Texas


Nick Hall-Patch
Victoria, BC
Canada

 

 



Re: 3D waterfall

jdow
 

May I suggest to you that you take a slow cruise through the menu system. You might discover a whole lot of goodies you had no idea were there. (I am sure somebody else has already pointed out that its on the view menu or "ribbon bar".)

{^_^}

On 20210704 03:55:41, Jos Stevens wrote:


Please, where to find that magic button to activate the 3D display, I searched long but can't find it.

Thanks,

Jos


Op 3-7-2021 om 23:07 schreef jdow:
What is stupid about the window can be put away, dismissed? I did not mean it can be removed from SDRC. It's not mandatory that the window be up if you do not want it.
{O.O}

On 20210703 04:54:28, Jens wrote:
 
... NO , 3D should get some more development !
 
SDR-Console is one of the best outstanding SDR application , maybe the best !!!
Instead making always reclamation ... it`s better to think about donation for
Simon and his great continously work !!!
 
I don`t like and have enough about stupid comments here ...
 
73 , Jens / HB9JOI
 
+++
 
 
From: jdow
Sent: Saturday, July 3, 2021 1:23 AM
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] 3D waterfall
 
The window can be dismissed.
{^_^}

On 20210702 08:27:03, David J Taylor via groups.io wrote:
On 02/07/2021 13:48, Francesco Di Giovanni wrote:
I find the 3D waterfall the most useless feature, only choreography.
[]

73
Francesco Di Giovanni - IN3XZP

Can you disable it?  I've not had chance to test as yet.

David GM8ARV



Virusvrij. www.avast.com


Re: SAQ 17.2 kHz QRV today

Gedas
 

Hi Dave and thank you for that snapshot of the transmission. It is really neat to see a look at the spectrum from the "other" side of pond of many of the signals that we jump up and down for when we see their faint trace on the waterfall.

I was going to ask you if you wanted to try something for fun......after sunset would you be willing to start out at 10 kHz and slowly tune up in frequency until you hit around 150 kHz and while doing so have SDRC make a video of your screen? You could keep your loop fixed in one direction, say, E-W etc.

I am thinking a slow scan so it takes 4-5 minutes to complete. Then post that video on your Google drive or dropbox etc so others can download it to scrutinize.

After a day or so you can of course delete the MP4. But this way we, far, far away can see what signals are present for you after the sun goes down. I would be more than happy to do the same for you (or anyone else) if you wish. I think it would be a fun way to hunt for signals and take advantage of another awesome feature in SDRC. 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 4:24 PM, D R via groups.io wrote:

For those who missed it, this is what it looked like during the warm up phase before the second transmission: a bit wobbly, but not bad for its age!

Received near York on an HF+ and a Wellbrook LFL1010 loop.

Regards,
Dave


Re: SNR meter, bandwidth and gain adjustment for transverters

Conrad, PA5Y
 

I have been doing some experimenting and based on my experience with other SDRs I still don’t understand what is going on. Comparative measurements are fine, but it appears that I cannot really use it as I would like to. However, as a band scope to use in conjunction with my K3S it is excellent. The ergonomics are great.

 

Regards

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow via groups.io
Sent: 03 July 2021 23:02
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters

 

SDRC is "fashionably" misperforming with regards to signal level measurement, perhaps to stop some other questions about signal level measurement.

{^_-}

On 20210703 03:48:43, Conrad, PA5Y wrote:

Hi Alan, sorry I was not moaning, I just wanted to know what could be done. I use Linrad for measurements but really like the UI, appearance and stability of SDR console. I use it in conjunction with my K3S and transverters and for that purpose it is absolutely perfect. Off outside to do more antenna work.
 
Regards 
 
Conrad
 
-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Alan G4ZFQ via groups.io
Sent: 03 July 2021 12:40
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] SNR meter, bandwidth and gain adjustment for transverters
 
 
 > The signal level meter gives a rough number for the 59 boys.
 
I expected Joanne to make a comment:-)
There was a discussion a few months back where it was decided there was better software for scientific measurements.
You may find it a failing but there are so many other features in Simon's software that are not available elsewhere.
 
Alan
 
 
 
 
 
 
 
 
 
 

 


Re: SAQ 17.2 kHz QRV today

D R
 

For those who missed it, this is what it looked like during the warm up phase before the second transmission: a bit wobbly, but not bad for its age!

Received near York on an HF+ and a Wellbrook LFL1010 loop.

Regards,
Dave


Re: Previously LIVE video of SAQ transmitter startup TODAY and ops at 17.2KHz (Resend)

Bill Walch
 

On 7/4/2021 3:48 PM, Bill Walch via groups.io wrote:
Quite fascinating that the SAQ VLF transmitter in Sweden, built in 1924, is still operating.

https://swling.com/blog/2021/07/live-video-of-startup-tuning-and-transmitting-from-alexanderson-alternator-saq/

https://youtu.be/lbvsHUBM18Y





Previously LIVE video of SAQ transmitter startup TODAY and ops at 17.4KHz

Bill Walch
 


Re: SDRC & SDRPlay RSPdx S-Meter Study

Gedas
 

Yes, TU....that is ONE possibility of settings for somewhat accurate s-meter readings.

But also a good take away was that pretty much most of the setting variants indicated that a 10 dB change in input level did correspond to a 10 dB change in s-meter.

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 2:22 PM, Siegfried Jackstien wrote:

i have seen the video

summarize ... set rf gain to 27db (max sensitivity), if gain to - 35db (not overdrive next stages) , visual gain to -40 db (calibrate s-meter)... and your readout should be good to plusminus 1 db or so ... between -130dbm and -50dbm!!

base noise then is at around -145dbm (from what i could see in the video) ... so a -140dbm signal is still clearly 5 db over the base noise

.....

what i do on any sdr... i set the gain (rf gain and if gain)  that the base noise just BARELY lifts up ... to have the max sensitivity ... and then with visual gain i set it that the s meter readings are ok (do match the real level) ...

most sdr are quite accurate in readings (as you found out with your signal generator)

why the rspdx needs a minus 75 db correction downwards (if gain and visual gain summed up) ... ok that how it is done in THIS sdr (others sure need different settings)

gedas ... a question ... can you try to set visual gain lower and increase if gain .. or set if gain lower and increase visual gain ... and have the same results??

does the rspdx overdrive on a setting?? (sure it does depending what level you throw at it) ... at what level with what settings??

means try to find a setup with max sensitivity and high dynamic range before overdriving ... try different combinations of visual gain and rf gain to find the best compromize and then let it there

plus ... you can do that also on vhf and uhf (and maybe find complete different numbers)

next is ... if you set your receiving a  bit sideways from centre ... do you see "ghost" signals?? (a mirror of the main signal or mixing products)??

pull the "high" slider in spectrum a bit upwards (to see those high peaks also with -50dbm or higher without going "out of sight" at the top)

greetz sigi dg9bfc


Am 04.07.2021 um 19:07 schrieb Gedas:

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDRC & SDRPlay RSPdx S-Meter Study

Siegfried Jackstien
 

i have seen the video

summarize ... set rf gain to 27db (max sensitivity), if gain to - 35db (not overdrive next stages) , visual gain to -40 db (calibrate s-meter)... and your readout should be good to plusminus 1 db or so ... between -130dbm and -50dbm!!

base noise then is at around -145dbm (from what i could see in the video) ... so a -140dbm signal is still clearly 5 db over the base noise

.....

what i do on any sdr... i set the gain (rf gain and if gain)  that the base noise just BARELY lifts up ... to have the max sensitivity ... and then with visual gain i set it that the s meter readings are ok (do match the real level) ...

most sdr are quite accurate in readings (as you found out with your signal generator)

why the rspdx needs a minus 75 db correction downwards (if gain and visual gain summed up) ... ok that how it is done in THIS sdr (others sure need different settings)

gedas ... a question ... can you try to set visual gain lower and increase if gain .. or set if gain lower and increase visual gain ... and have the same results??

does the rspdx overdrive on a setting?? (sure it does depending what level you throw at it) ... at what level with what settings??

means try to find a setup with max sensitivity and high dynamic range before overdriving ... try different combinations of visual gain and rf gain to find the best compromize and then let it there

plus ... you can do that also on vhf and uhf (and maybe find complete different numbers)

next is ... if you set your receiving a  bit sideways from centre ... do you see "ghost" signals?? (a mirror of the main signal or mixing products)??

pull the "high" slider in spectrum a bit upwards (to see those high peaks also with -50dbm or higher without going "out of sight" at the top)

greetz sigi dg9bfc


Am 04.07.2021 um 19:07 schrieb Gedas:

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDRC & SDRPlay RSPdx S-Meter Study

Gedas
 

Have you watched the video Simon? I ask because the video sorta shows clearly what happens. I guess if you saw it and still wanted me to summarize the data I would do that (it is the least I could do for you after everything you have done for us). 73

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 12:55 PM, Simon Brown wrote:

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SDRC & SDRPlay RSPdx S-Meter Study

Simon Brown
 

Any chance you could write the details here?

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Gedas
Sent: 04 July 2021 16:49
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] SDRC & SDRPlay RSPdx S-Meter Study

 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT
 
Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

 


--
- + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.


Re: SAQ 17.2 kHz QRV today

Gedas
 

I like listening to VLF signals.....too bad the transmissions did not occur during mutual night time between Europe and NA :-(

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
On 7/4/2021 10:10 AM, Max wrote:

Heard it on my RSP2Pro with 60ft loose wire out of window at low level. Just above the noise and some characters fully discernible. With a decent antenna I would have copied it no problem. Location, south coast of England (near Eastbourne).

Thanks once again for the reminder Ingolf.

73

Max 


SDRC & SDRPlay RSPdx S-Meter Study

Gedas
 

So just for the fun of it yesterday I input different RF level carriers into my RSPdx while changing some of the RF gain, IF gain, and Visual Gain settings.

No conclusions are being drawn here, simply noting some observations. I was always curious to see what different levels looked like on the s-meter of my receiver. I hope it is of some value to others.

https://www.youtube.com/watch?v=qHJE6wa9dVw

Gedas, W8BYA EN70JT

Gallery at http://w8bya.com (under repair)
Light travels faster than sound....
This is why some people appear bright until you hear them speak.

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