Re: [digitalradio] Re: Bad PSK signals & linears
>If I am receiving a psk31 signal at a -12 dB SNR and I can >amplify the signal >by 9 dBm that would make the SNR at -3 dB. >If psk31 can't decode the signal >then, I would suspect that >there is a problem with psk31 or the receive or >transmit >soB ftware. >A fade of 6 to 10 dB us not all that uncommon on HF. >So all you are doing is compensating for the fade. >Walt/K5YFW A PSK125 signal can be decoded at 3 dB S/N, it will not be decoded at 2 dB S/N. On 30m we see fades of 80 dB. Any dB you can add on the TX side is gain, it can make the difference between 100% copy and lousy copy. 73, Rein EA/PA0R/P -via pskmail-
Re: [digitalradio] Re: Bad PSK signals & linears
If I am receiving a psk31 signal at a -12 dB SNR and I can amplify the signal by 9 dBm that would make the SNR at -3 dB. If psk31 can't decode the signal then, I would suspect that there is a problem with psk31 or the receive or transmit software. A fade of 6 to 10 dB us not all that uncommon on HF. So all you are doing is compensating for the fade. Walt/K5YFW James Wilson wrote: > > During an emergency you can pretty much do whatever it takes to get your > message through. > > But if you can't decode him turning up your power won't help. > > - Original Message - > *From:* Walt DuBose <mailto:[EMAIL PROTECTED]> > *To:* digitalradio@yahoogroups.com > <mailto:digitalradio@yahoogroups.com> > *Sent:* Saturday, March 10, 2007 8:10 PM > *Subject:* [digitalradio] Re: Bad PSK signals & linears > > Ok, here's a question I don't know how to answer since I don't have > the experience. > > Let's say I am running my IC-746PRO on PSK31 and passing disaster > relief traffic > in and out of a disaster area. If the station I am working on the > other end > can't decode me and I am also having trouble decoding his signal due > to a weak > signal, if I turn on my linear is that Ok or should I just give up > and wait for > better conditions? And my assumption is that the linear is properly > tuned to > amplify a PSK31 signal and my antenna and band is optimum for the > working path. > > 73, > > Walt/K5YFW > >
[digitalradio] Re: Bad PSK signals ?
--- In digitalradio@yahoogroups.com, "Andrew O'Brien" <[EMAIL PROTECTED]> wrote: > > I was watching a bad PSK31 signal on 40M this morning, an IMD of -6 > and harmonic waterfall 'trails" all over my 3 Khz wide display. Do > "official observers" ever get involved in these cases ? Seems that > friendly "pink slips" might be useful here . > > I watched another bad PSK signal on 40M today. -9 IMD and harmonics radiating out 2000 Hz from the center. The person they were working responded with a report "100% copy and a real nice signal".
Re: [digitalradio] Re: Bad PSK signals ?
Well drink some water from Thirlmere since it is actually a resovoir (or was, last I knew) and if you stop by Windermere, that's my home town. There are a couple of repeaters in that area linked to Echolink so you might be able to communicate from Thirlmere to Thirlmere. Andy K3UK On 3/11/07, Brad <[EMAIL PROTECTED]> wrote: > > And I will be visiting that QTH in about 6 weeks! >
RE: [digitalradio] Re: Bad PSK signals ?
And I will be visiting that QTH in about 6 weeks! _ From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Andrew O'Brien Sent: Sunday, 11 March 2007 3:43 PM To: digitalradio@yahoogroups.com Subject: Re: [digitalradio] Re: Bad PSK signals ? I from the original Thirlmere area. On 3/10/07, Brad mailto:[EMAIL PROTECTED]> exemail.com.au> wrote: _ From: digitalradio@ <mailto:digitalradio@yahoogroups.com> yahoogroups.com [mailto:[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> com] On Behalf Of Andrew O'Brien A ZL called a VK for advice ! What is the world coming to ? Just some big brotherly advice. Andy K3UK (from near Thirlmere) Hmm, I would expect better signals from you! Brad VK2QQ actually in Thirlmere. _,_._,___ -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb. <http://www.obriensweb.com> com
Re: [digitalradio] Re: Bad PSK signals ?
I from the original Thirlmere area. On 3/10/07, Brad <[EMAIL PROTECTED]> wrote: -- *From:* digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] *On Behalf Of *Andrew O'Brien A ZL called a VK for advice ! What is the world coming to ? Just some big brotherly advice. Andy K3UK (from near Thirlmere) Hmm, I would expect better signals from you! Brad VK2QQ actually in Thirlmere. _,_._,___ -- Andy K3UK Skype Me : callto://andyobrien73 www.obriensweb.com
RE: [digitalradio] Re: Bad PSK signals ?
_ From: digitalradio@yahoogroups.com [mailto:[EMAIL PROTECTED] On Behalf Of Andrew O'Brien A ZL called a VK for advice ! What is the world coming to ? Just some big brotherly advice. Andy K3UK (from near Thirlmere) Hmm, I would expect better signals from you! Brad VK2QQ actually in Thirlmere. _,_._,___
Re: [digitalradio] Re: Bad PSK signals & linears
During an emergency you can pretty much do whatever it takes to get your message through. But if you can't decode him turning up your power won't help. - Original Message - From: Walt DuBose To: digitalradio@yahoogroups.com Sent: Saturday, March 10, 2007 8:10 PM Subject: [digitalradio] Re: Bad PSK signals & linears Ok, here's a question I don't know how to answer since I don't have the experience. Let's say I am running my IC-746PRO on PSK31 and passing disaster relief traffic in and out of a disaster area. If the station I am working on the other end can't decode me and I am also having trouble decoding his signal due to a weak signal, if I turn on my linear is that Ok or should I just give up and wait for better conditions? And my assumption is that the linear is properly tuned to amplify a PSK31 signal and my antenna and band is optimum for the working path. 73, Walt/K5YFW
[digitalradio] Re: Bad PSK signals & linears
--- In digitalradio@yahoogroups.com, Walt DuBose <[EMAIL PROTECTED]> wrote: > if I turn on my linear is that Ok or should I just give up and wait for > better conditions? > Walt/K5YFW K5? Sure, crank it up.
[digitalradio] Re: Bad PSK signals & linears
Ok, here's a question I don't know how to answer since I don't have the experience. Let's say I am running my IC-746PRO on PSK31 and passing disaster relief traffic in and out of a disaster area. If the station I am working on the other end can't decode me and I am also having trouble decoding his signal due to a weak signal, if I turn on my linear is that Ok or should I just give up and wait for better conditions? And my assumption is that the linear is properly tuned to amplify a PSK31 signal and my antenna and band is optimum for the working path. 73, Walt/K5YFW
Re: [digitalradio] Re: Bad PSK signals ?
On 3/10/07, Brad <[EMAIL PROTECTED]> wrote: while the offending ZL was on air > and he received the email between transmissions, called me on psk and > asked for advice. Instant results! > > Brad VK2QQ > A ZL called a VK for advice ! What is the world coming to ? Andy K3UK (from near Thirlmere)
[digitalradio] Re: Bad PSK signals ?
--- In digitalradio@yahoogroups.com, "Roger J. Buffington" <[EMAIL PROTECTED]> wrote: > > mulveyraa2 wrote: > That is certainly disappointing. What software do you use to take a > screenshot? Will it work with MixW? > > de Roger W6VZV > Click ALT-PRTSCREEN and then click Paste directly into your email program. Easy. I've even done this while the offending ZL was on air and he received the email between transmissions, called me on psk and asked for advice. Instant results! Brad VK2QQ
[digitalradio] Re: Bad PSK signals ?
--- In digitalradio@yahoogroups.com, "Andrew O'Brien" <[EMAIL PROTECTED]> wrote: > > I was watching a bad PSK31 signal on 40M this morning, an IMD of -6 > and harmonic waterfall 'trails" all over my 3 Khz wide display. Do > "official observers" ever get involved in these cases ? Seems that > friendly "pink slips" might be useful here . > > > -- > Andy K3UK > Skype Me : callto://andyobrien73 > www.obriensweb.com > In the past, I have taken a screen shot of signals like this, which will identify the station from the text, the frequency, time of day, it's all there, then emailed it off to their qrz.com listed address. I have included a friendly note suggesting that they may not be aware of their signal, and have received thanks in return. Brad VK2QQ
Re: [digitalradio] Re: Bad PSK signals ?
Roger J. Buffington wrote: > That is certainly disappointing. What software do you use to take a > screenshot? Will it work with MixW? > > de Roger W6VZV You could try with a simple Print Screen dump to the clipboard, and then paste it to Paint, Photoshop or whatever. I use Gadwin Print Screen 2.6, and Irfanview 3.99 is also capable of screen grabs. MultiPSK by itself can do screen dumps to a graphic file. 73, Jose CO2JA __ V Conferencia Internacional de Energía Renovable, Ahorro de Energía y Educación Energética. 22 al 25 de mayo de 2007 Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.cujae.edu.cu/eventos/cier
[digitalradio] Re: Bad PSK signals ?
Striking your keyboard's PrintScreen button will place an image of the entire screen in the Windows Clipboard. Depressing the Alt key while striking PrintScreen will place an image of the currently- active window in the Windows Clipboard; this is the recommended approach. PrintScreen is often abbreviated on keytops; on my IBM T42 laptop, the label is PrtSc. Once you have an image in the Windows Clipboard, you can open MS Paint, and select the Edit:Paste menu item to create a bitmap image that you can save to a .bmp file. Place that .bmp file in a zip archive (bitmaps are big, but compress well), and email. If you have PhotoShop or some other image editing application installed, you can instead paste the image there, and directly generate a JPEG file (with appropriate compression), which can be directly attached to an email message. There's a nice application called SnagIt that combines the screen shot capture and image saving process, but it costs a few $. 73, Dave, AA6YQ --- In digitalradio@yahoogroups.com, "Roger J. Buffington" <[EMAIL PROTECTED]> wrote: > > mulveyraa2 wrote: > > > I think I've actually gotten a "Thanks! I'll drop my drive level down > > next time" maybe twice. A few never responded back, and the > > remainder were of the "F-you, there's nothing wrong with my signal or > > equipment" style. Needless to say, you can recognize the same guys > > over and over again in the passband without even clicking on their > > trace to decode them, like a certain kt4* who doesn't seem capable of > > ever turning his amp off. > > > > - Rich > > That is certainly disappointing. What software do you use to take a > screenshot? Will it work with MixW? > > de Roger W6VZV >
Re: [digitalradio] Re: Bad PSK signals ?
mulveyraa2 wrote: > I think I've actually gotten a "Thanks! I'll drop my drive level down > next time" maybe twice. A few never responded back, and the > remainder were of the "F-you, there's nothing wrong with my signal or > equipment" style. Needless to say, you can recognize the same guys > over and over again in the passband without even clicking on their > trace to decode them, like a certain kt4* who doesn't seem capable of > ever turning his amp off. > > - Rich That is certainly disappointing. What software do you use to take a screenshot? Will it work with MixW? de Roger W6VZV
[digitalradio] Re: Bad PSK signals ?
I would just tell the operator directly; in my experience, they're usually appreciative, and can't wait to race off and fix the problem. 73, Dave, AA6YQ --- In digitalradio@yahoogroups.com, "Andrew O'Brien" <[EMAIL PROTECTED]> wrote: > > I was watching a bad PSK31 signal on 40M this morning, an IMD of -6 > and harmonic waterfall 'trails" all over my 3 Khz wide display. Do > "official observers" ever get involved in these cases ? Seems that > friendly "pink slips" might be useful here . > > > -- > Andy K3UK > Skype Me : callto://andyobrien73 > www.obriensweb.com >
Re: [digitalradio] Re: Bad PSK signals ?
> them, like a certain kt4* who doesn't seem capable > of ever turning his > amp off. > > - Rich Ive done it with several ops also. 1 has said thanks, most say F you :D. And ya the KT4 doesnt seem to understand PSK31 is just fine without running full gallon ... and sounding like crap. Don't pick lemons. See all the new 2007 cars at Yahoo! Autos. http://autos.yahoo.com/new_cars.html
[digitalradio] Re: Bad PSK signals ?
--- In digitalradio@yahoogroups.com, Chuck Mayfield <[EMAIL PROTECTED]> wrote: > > Suggestion: Don't wait for an OO. Look up his call at QRZ.com, get > his phone number, give him a call and talk to him about the > problem. The op probably does not know that he is over-driving his audio. > I've done this maybe a dozen times in the past few years, though I don't call on the phone, just email when I can find it. I always include a polite note and a MixW screenshot of the offending signal, and make sure to indicate other good signals in the passband, so it can't be just put down to line level issues, etc. I think I've actually gotten a "Thanks! I'll drop my drive level down next time" maybe twice. A few never responded back, and the remainder were of the "F-you, there's nothing wrong with my signal or equipment" style. Needless to say, you can recognize the same guys over and over again in the passband without even clicking on their trace to decode them, like a certain kt4* who doesn't seem capable of ever turning his amp off. - Rich
