Date   

Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Larry Dodd
 

Tom ,
Unfortunately Hank only said visually impaired. That could range from mild impairment to totally blind. There are over 15 commercial screen readers for the visually impaired. Each offering a unique set of features. Some simply magnify the computer screen to those that read text to voice to detailed analyzation of screen content. Since no one was responding to him I responded mainly to let him know someone cared. That was the only purpose of my response. I’m not sorry I did. I normally refrain from comments as issues get beat to ad nauseam. 
Larry K4LED 

------------
K4LED Links:
https://101science.com

https://www.101science.com/radiojove.html


http://youtube.com/channel/UCtawz3MnMBwjz9ShhSC0ygQ/live


On Feb 27, 2022, at 6:09 PM, Tom Crosbie G6PZZ <tom@...> wrote:



Larry,

I didn’t know enough about his problem other than to quote the author. Most radio related videos I have watched depend highly on the visual content. I am slightly visually impaired but would get nothing from YouTube with just audio. I also thought, possibly in error that a screen reader read just text on screen within a limited area. As so much of SDRC is essentially a picture, I couldn’t grasp how he could be helped. Perhaps I am insensitive in that I am lucky to have most of my vision, at least in one eye, and haven’t yet had to resort to a screen reader.

I apologise if I have offended you but I might have considered an alternative but sadly couldn’t think of one. Whilst there are some good YouTube recordings, you have to wade through a lot of crap to find the good stuff. IMHO.

Tom G6PZZ

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 13:44
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Tom,

Absolutely not at all. Listening to YouTube videos one can learn a lot. He uses a screen reader so has some level of vision. I’m hearing impaired so I am well aware of impairments. I take your email as insensitive. I was trying to help. Did you?

Larry K4LED 



On Feb 27, 2022, at 7:09 AM, Tom Crosbie G6PZZ <tom@...> wrote:



Larry,

YouTube videos are not going to be much help to the visually impaired. A bit insensitive perhaps?

Tom G6PZZ

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 01:09
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Hank

There are several YouTube videos on setting up and using SDR Console. Using Windows accessibility text to voice capability might help also. 

Larry K4LED 




On Feb 26, 2022, at 7:38 PM, The Wolf <hank.smith966@...> wrote:

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank







Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Tom Crosbie G6PZZ
 

Larry,

I didn’t know enough about his problem other than to quote the author. Most radio related videos I have watched depend highly on the visual content. I am slightly visually impaired but would get nothing from YouTube with just audio. I also thought, possibly in error that a screen reader read just text on screen within a limited area. As so much of SDRC is essentially a picture, I couldn’t grasp how he could be helped. Perhaps I am insensitive in that I am lucky to have most of my vision, at least in one eye, and haven’t yet had to resort to a screen reader.

I apologise if I have offended you but I might have considered an alternative but sadly couldn’t think of one. Whilst there are some good YouTube recordings, you have to wade through a lot of crap to find the good stuff. IMHO.

Tom G6PZZ

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 13:44
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Tom,

Absolutely not at all. Listening to YouTube videos one can learn a lot. He uses a screen reader so has some level of vision. I’m hearing impaired so I am well aware of impairments. I take your email as insensitive. I was trying to help. Did you?

On Feb 27, 2022, at 7:09 AM, Tom Crosbie G6PZZ <tom@...> wrote:



Larry,

YouTube videos are not going to be much help to the visually impaired. A bit insensitive perhaps?

Tom G6PZZ

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 01:09
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Hank

There are several YouTube videos on setting up and using SDR Console. Using Windows accessibility text to voice capability might help also. 

Larry K4LED 




On Feb 26, 2022, at 7:38 PM, The Wolf <hank.smith966@...> wrote:

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank







Re: What the heck?

jdow
 

This is probably a military format and likely Russians are involved. There is a war going on thanks to the Russian psychopath.

{^_^}

On 20220227 10:21:04, Simon Brown wrote:

When running digital there should be no audio compression at all, also no ALC compression, I guess this may be the problem.

 

Trust me, there’s worse round here on 2m at times.

 

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: 27 February 2022 18:11
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] What the heck?

 

Running an amp on digital modes, or a clueless operator?
Or just a really  W I D E  digital signal?

73 Kriss KA1GJU
See attachments:


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


Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

jdow
 

You do not need any vision at all to use a screen reader. You need some sighted help up front, maybe, but cursor position can be known pretty accurately with sound cues, especially for people with very good relative or absolute pitch accuracy.

{^_^}

On 20220227 05:44:03, Larry Dodd wrote:

Tom,
Absolutely not at all. Listening to YouTube videos one can learn a lot. He uses a screen reader so has some level of vision. I’m hearing impaired so I am well aware of impairments. I take your email as insensitive. I was trying to help. Did you?
Larry K4LED 


On Feb 27, 2022, at 7:09 AM, Tom Crosbie G6PZZ <tom@...> wrote:



Larry,

YouTube videos are not going to be much help to the visually impaired. A bit insensitive perhaps?

Tom G6PZZ

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 01:09
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Hank

There are several YouTube videos on setting up and using SDR Console. Using Windows accessibility text to voice capability might help also. 

Larry K4LED 



On Feb 26, 2022, at 7:38 PM, The Wolf <hank.smith966@...> wrote:

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank







Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Max
 

On Sun, Feb 27, 2022 at 05:21 AM, Simon Brown wrote:
SDR Console isn't really suitable for the visually impaired, it's designed for use with the mouse. Fully keyboard support doesn't exist and to be honest I don't think it's really possible.
Simon

I think there is quite a lot of functionality for keyboard use. I think certainly not everyone aware of the ability to tune using the keyboard arrow/cursor L/R/Up/Down keys? Ability to program key shortcuts for mode and bandwidth is the big missing feature I feel.

Unfortunately when programming custom keyboard keys (using the facility on the ribbon bar More Commands > Customize) these are somewhat buggy and while some do work, some can be programmed but do not "stick", so they work until a restart then vanish again. Even fixing this issue would give a lot more keyboard functionality than currently available. Is there any chance of at least getting this custom keys facility to function correctly for all the listed menu items? Even the ability to reliably program individual keys to recall Memories and Favourites would be a big plus, given that they store mode/bandwidth.

I know it's not a trivial request, but it's frustrating that it's so nearly there. Appears available but sadly not fully functioning yet.

Max


Re: What the heck?

Conrad, PA5Y
 

Unlikely as the IC-7300 has some plus points, one of which is that it is quite forgiving of audio input levels. This is audio overdrive; it sounds like a fuzz box which result in harmonically rich square waves. I’m not suggesting he is using an outboard fuzz box just that if he did it would sound the same 😊

 

Conrad

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kriss Kliegle KA1GJU via groups.io
Sent: 27 February 2022 19:33
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] What the heck?

 

Maybe it's one of those 'noisy' IC-7300's that was so debated on another thread? 🤣
Cheers! Kriss KA1GJU

PS:  Very weak via Simon's server, so must be some LID over here stateside. Checked on my beam going south and weak in that direction too.


Re: What the heck?

Kriss Kliegle KA1GJU
 

Maybe it's one of those 'noisy' IC-7300's that was so debated on another thread? 🤣
Cheers! Kriss KA1GJU

PS:  Very weak via Simon's server, so must be some LID over here stateside. Checked on my beam going south and weak in that direction too.


Re: What the heck?

Simon Brown
 

There’s more than one signal contributing to this.

 

Never used Q65 myself (never used any JT modes) but I understand the desire some have to crank everything to 11 to work a station.

 

Simon Brown, G4ELI

https://www.sdr-radio.com

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Conrad, PA5Y
Sent: 27 February 2022 18:21
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] What the heck?

 

That is audio overdrive that is the problem, it sounds like Q65 which are inherently narrowband.

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kriss Kliegle KA1GJU via groups.io
Sent: 27 February 2022 19:11
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] What the heck?

 

Running an amp on digital modes, or a clueless operator?
Or just a really  W I D E  digital signal?

73 Kriss KA1GJU
See attachments:

Attachments:


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


Re: What the heck?

Simon Brown
 

Hell’s Teeth – just watched the video!

 

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: 27 February 2022 18:11
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] What the heck?

 

Running an amp on digital modes, or a clueless operator?
Or just a really  W I D E  digital signal?

73 Kriss KA1GJU
See attachments:


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


Re: What the heck?

Conrad, PA5Y
 

That is audio overdrive that is the problem, it sounds like Q65 which are inherently narrowband.

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Kriss Kliegle KA1GJU via groups.io
Sent: 27 February 2022 19:11
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] What the heck?

 

Running an amp on digital modes, or a clueless operator?
Or just a really  W I D E  digital signal?

73 Kriss KA1GJU
See attachments:

Attachments:


Re: What the heck?

Simon Brown
 

When running digital there should be no audio compression at all, also no ALC compression, I guess this may be the problem.

 

Trust me, there’s worse round here on 2m at times.

 

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: 27 February 2022 18:11
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] What the heck?

 

Running an amp on digital modes, or a clueless operator?
Or just a really  W I D E  digital signal?

73 Kriss KA1GJU
See attachments:


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


What the heck?

Kriss Kliegle KA1GJU
 

Running an amp on digital modes, or a clueless operator?
Or just a really  W I D E  digital signal?

73 Kriss KA1GJU
See attachments:


Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Larry Dodd
 

Tom,
Absolutely not at all. Listening to YouTube videos one can learn a lot. He uses a screen reader so has some level of vision. I’m hearing impaired so I am well aware of impairments. I take your email as insensitive. I was trying to help. Did you?
Larry K4LED 

------------
K4LED Links:
https://101science.com

https://www.101science.com/radiojove.html


http://youtube.com/channel/UCtawz3MnMBwjz9ShhSC0ygQ/live


On Feb 27, 2022, at 7:09 AM, Tom Crosbie G6PZZ <tom@...> wrote:



Larry,

YouTube videos are not going to be much help to the visually impaired. A bit insensitive perhaps?

Tom G6PZZ

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 01:09
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Hank

There are several YouTube videos on setting up and using SDR Console. Using Windows accessibility text to voice capability might help also. 

Larry K4LED 



On Feb 26, 2022, at 7:38 PM, The Wolf <hank.smith966@...> wrote:

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank






Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Tom Crosbie G6PZZ
 

Larry,

YouTube videos are not going to be much help to the visually impaired. A bit insensitive perhaps?

Tom G6PZZ

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Larry Dodd
Sent: 27 February 2022 01:09
To: main@sdr-radio.groups.io
Subject: Re: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

 

Hank

There are several YouTube videos on setting up and using SDR Console. Using Windows accessibility text to voice capability might help also. 

On Feb 26, 2022, at 7:38 PM, The Wolf <hank.smith966@...> wrote:

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank






Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Simon Brown
 

Hank,

SDR Console isn't really suitable for the visually impaired, it's designed for use with the mouse. Fully keyboard support doesn't exist and to be honest I don't think it's really possible.

Simon Brown, G4ELI
https://www.sdr-radio.com

-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of The Wolf
Sent: 27 February 2022 00:06
To: main@SDR-Radio.groups.io
Subject: [SDR-Radio] keyboard shortcuts or setting up and using sdr-radio via web interface?

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank










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


Re: keyboard shortcuts or setting up and using sdr-radio via web interface?

Larry Dodd
 

Hank
There are several YouTube videos on setting up and using SDR Console. Using Windows accessibility text to voice capability might help also. 
Larry K4LED 

------------
K4LED Links:
https://101science.com

https://www.101science.com/radiojove.html


http://youtube.com/channel/UCtawz3MnMBwjz9ShhSC0ygQ/live


On Feb 26, 2022, at 7:38 PM, The Wolf <hank.smith966@...> wrote:

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank







keyboard shortcuts or setting up and using sdr-radio via web interface?

The Wolf <hank.smith966@...>
 

Hello I am visually impaired and use a screen reader

can any one tell me if there are keyboard shortcuts or a web interface fore setting up and using sdr-radio?

thanks

Hank


Re: Open HPSDR Hermes (14 bit ADC, EP3C25) Transceiver Card

Mark Cayton
 

Dan,

I have no idea how much power those Dow-Key relays would take, or any other specs for that matter, lol. I used a 62-110 relay for HF and routinely ran 100 watts through it with no apparent ill effects, and I used a 403A-2208 for VHF/UHF and ran 50 watts through that one (that's all the power my 897 had on those bands).

Mark


Re: IC-7300 composite noise

Conrad, PA5Y
 

This plot looks pretty good for a carrier freq of 622 MHz and with an SML03 as the input.  A premium specified Wenzel OCXO at 10MHz is -176dBc/Hz @ 100kHz separation, this is one of the very best available. So, at 622 MHz with a perfect multiplier this would be -176dBc/Hz + 20log(622/10) = -176dBc/Hz + 36dB = -140dBc/Hz. This combination is 19dB worse than that but with an SML03 as an input. I will have a look at the Si5323

 

73

 

Conrad PA5Y

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Siegfried Jackstien via groups.io
Sent: 26 February 2022 19:47
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] IC-7300 composite noise

 

the si5323 has some high phase noise ... not?!?

dg9bfc sigi

Am 25.02.2022 um 20:47 schrieb Larry Dodd:

Often the clock phase noise is the same whether run on an analog mains power supply or a DC battery. The total noise is inherent in the clock and other circuit design not its necessarily just the source of power. I run my station clock reference through a Silicon Labs Si5323 to clean up and stabilize the clock. 

Larry K4LED

 

On 2/25/2022 17:52:38, jdow <jdow@...> wrote:

On a hunch - run the radio on batteries. That this could be power supply noise modulating one of the stages or (horrors) the D/A converter's reference. (And I sort of wonder what the instrument's own phase noise is. Those numbers look a little too good. I'll check when I get up. It's bed time on my awfully skewed personal clock. Joanne Standard Time. The time zone changes UTC offset daily by as much as 6 hours. Insomnia is a way of life.)

{^_^}

On 20220225 06:59:57, Conrad, PA5Y wrote:

The Keysite picture was showing the spurs from a Hermes at 28.4 MHz with a 192kHz sample rate using the V1 firmware. it has nothing to do with the IC7300.

 

I have spare time now so I will repost the image of the IC-7300.

 

IC-7300 is at 30W output on 28.2 MHz with offsets from 10Hz to 1MHz, Blue trace is PN, Black trace is AM noise, Green trace is composite noise. This uses the FSWP which can measure AM noise and PN simultaneously.

 

Then I will go away for a while.

 

 

 

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow via groups.io
Sent: 25 February 2022 14:39
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Open HPSDR Hermes (14 bit ADC, EP3C25) Transceiver Card

 

Looking at the Keysight picture you posted it's hard to tell the characteristics of the peaks that appear beside the (was it?) 28.4 MHz signal. (The screen notation of 390 kHz is confusing. That is the marker's offset?)

It appears like the 7300 is using a digital frequency synthesizer with way too few bits to make a good signal. If I got a rig that bad I think I'd have some stern words with ICOM about it. While it might be marginally legal it is unethical to sell something that bad. (And at 100W I thought the limit was -70 dB in the US.

{^_^}


On 20220225 04:03:42, Conrad, PA5Y wrote:

Hi, no it is actually 5 different IC7300s tested by 3 different people, including Rob Sherwood. if you have time you can see the plots and some other data that I posted earlier just do a search. I’m in my lunch break or I would do it for you.

 

Yes my TX IS that good but it is easier for me because I use 0dBm transverter drives at 28Mhz and transverters with high quality Xtal local oscillators. The 0dBm from either my K3S or TS-890S is very good indeed. IMD3 from both is better than -50dBc.

 

On 144 MHz,  PN noise at 1kHz separation is -144dBc/Hz and close to 156dBc/Hz at 10kHz. This is with the LO PLL active, free running it is a little better. Composite noise is the same as in this case it is PN dominated. IM3 is -38dBc but more importantly the 7th and 9th orders are better than -80dBc. This is achieved by using tetrode finals on all bands.

 

432 and 1296 are of course worse as the LOs are multiplied from Xtals in the VHF region. However my TX is some 40dB better than an IC-9700 at 1.3GHz at 10kHz separation.

 

 

Only 50MHz is a little worse due to my TS-890S PA linearity but with the noise on 6m being higher it is acceptable. When I am on FT8 where linearity does not matter it is superb. But who cares we are all on the same ‘channel’.

 

73

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow via groups.io
Sent: 25 February 2022 11:49
To: main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Open HPSDR Hermes (14 bit ADC, EP3C25) Transceiver Card

 

I suspect your specification is still beyond the state of the art. Is your transmitter that good?

It sounds like the 7300 is cleaner than average close in but has some issues fairly far out. That is a little surprising. I wonder if the "IP+" technology is simply RF feedback to linearize the transmitter stages such as is seen in the old Collins kW SSB amplifiers. I can see that having an issue that depends on the charteristics of the feedback loop. But those are strange characteristics.

I take it the noise peaks are broadband, right? Do they depend on the transmit frequency in any way? It sounds very much like there is a defect in a specific radio near you. Is that the case or are hams measuring this in general? If this affects all the 7300s then the FPGA code will probably have to be reworked to fix the bug. I kinda wish I had one and a nice lab with lots of pertinent test equipment. I doubt Keysight and ICOM would set me up to do it. (It'd be better for them to set up a tiger team of their engineers with the equipment needed to suppress this possible bug.)

{^_^}



On 20220225 01:55:45, Conrad, PA5Y wrote:

By clean I mean - can I hear anything of sufficient magnitude to disturb the noise floor anywhere in band, and hence inhibit my ability to receive signals close to the noise floor. The noise floor in a semi-rural location on 28, 50 and 70MHz is not particularly low so I do not feel that this is unreasonable. The biggest problem with the IC7300 is the AM noise bump at 20kHz and 130kHz which is only 60dB down on the carrier when running at 30W on 28MHz. This power level is typical when driving an amplifier.  When modulated with an SSB signal this occupies a considerable amount of bandwidth.  The close in PN -s only -120dBc/Hz at 1kHz and  -130dBc/Hz at 10kHz. The composite noise is -115kHz at 10kHz, this is not what I would consider clean, even close in. The K3S( and a few others) is far better in this respect although the PA has quite poor linearity, especially on 6m.

 

The Hermes will do a much better job with any decent PA, even without pure signal. There are some spurs @ -65dBc which improve with a higher sample rate.  I have not checked these with the V2 firmware but I will do immediately I receive my Hermes from Apache.

 

I do not think that a transceiver at the IC-7300 price point has fixed pre-distortion. As you quite correctly say keeping it under control over temperature and voltage variation would be difficult. Also Icom would almost certainly have mentioned it in their advertising. What the IC7300 does well is manage audio overshoots by using a ‘look ahead’ algorithm. This is maybe where the impression of it having a clean TX comes from.

 

I think that the problem here is that so many transceivers are quite bad, so I can just about accept that the IC-7300 is less bad.

 

73

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of jdow via groups.io
Sent: 25 February 2022 10:27
To:
main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Open HPSDR Hermes (14 bit ADC, EP3C25) Transceiver Card

 

OK, please refresh my mind what you mean by "clean". It certainly appears to be sending something much closer to pure signal concentrated within its intended bandwidth than most other transmitters. I also understand that it is not as good as it can be with full active predistortion. Both might generate increased noise at some significant separation from the intended signal frequency. I am not sure of the mechanism by which this would take place.

As an ornery critter there is nothing I would sit down and declare "clean" without a definition of "clean". I guess I am asking for your definition of the term or even of the term "clean enough".

{O.O}




On 20220225 01:13:11, Conrad, PA5Y wrote:

I KNOW for a fact that the IC7300 is not clean. Please provide me some evidence to the contrary. I have measurements with a R&S FSWP Signal analyser out to a 1MHz BW. You guys are looking in an SSB BW which is fine unless you happen to be 130kHz away, then you will hear plenty of splatter from the IC7300. I tested the IC-7300 as a result of hearing this on 50MHz. In other words the lab tests were driven by on air experience.

 

You are spreading misleading and incorrect information.

 

73

 

Conrad PA5Y

 

From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of oldjackbob via groups.io
Sent: 24 February 2022 23:12
To:
main@SDR-Radio.groups.io
Subject: Re: [SDR-Radio] Open HPSDR Hermes (14 bit ADC, EP3C25) Transceiver Card

 

On Wed, Feb 23, 2022 at 12:24 PM, Max wrote:

I just think if we follow good design and signal chain management that superb, clean signals can also be generated without the need for PS, that's all.

Max,

I disagree. My signal is my signature. Audio clarity is admittedly important but what matters most to me is a splatter-free signal, and in that regard nothing comes close to what PS can produce. As I stated earlier, even the best Class A amplifiers only have -40dB splatter. PS starts at -60db and often pushes -70dB. That means that PS reduces splatter to less than 1% (and at times only 1/10 of 1%) of what even the best traditional equipment can produce.

I also agree with Simon that the 7300 (and also the 7610 for that matter) produces an extremely sharp-edged signal with unarguably less splatter than is achievable with any other non-ANAN radio. It was explained to me by Ray N5LAX that the reason those radios are so clean splatter-wise is because ICOM embedded an algorithm into the firmware that functions very similarly to PS in the sense that it corrects for non-linearity in the PA, but it is a fixed-value (i.e., static) correction only, not a real-time self-adjusting correction value such as is employed by PS. NOTE: I have not been able to verify that info, but that is what was told to me over-the-air by Ray when I commented that I had no idea how the 7300 could produce such a clean, sharp-edged signal. So I'm repeating it here.

IMO it's unwise and short-sighted to summarily dismiss the game-changing value that PS brings to the hobby. Its benefits are so unarguable that I (and Rob Sherwood) often wonder why the big-name radios don't offer it as a standard feature. It's free, so utilize it for goodness sake!

73,

Mark





 

 

 

 


Re: Transmit AX.25

Siegfried Jackstien
 

a hint ... use TWO virtual cards .. one for rx and one for tx (example vb cable a and b)

dg9bfc sigi

Am 26.02.2022 um 21:55 schrieb Douglas Pervine:

Easier said than done.

The problem is keying PTT.  SDR software doesn't have a way to PTT transmit on and off.
and/or
SDR devices (i.e. LimeSDR Mini / Adalm-Pluto) can't accept a PTT.

Transmit is a constant right now.  (VOX doesn't work at all.)

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