RE: [multipsk] Re: [digitalradio] A test of cmsk on 8.97kHz


Oct 2, 2011

 


----------------------------

#11375 Oct 2, 2011

Hi Patrick,



Thank for your feedback . I have made me a lite test lab here running

multipsk in SdR mode . I am using my 10x10m loop antenna in the garden

to transmit but I am only using a small piece of wire into the mic om

my "receiver lap top " in the shack. To simulated a transmission I am

turning the power of the amplifier down to an minimum. It is amazing how

well your mode is working . Tomorrow I am going to test pskam10 and

throbx in the field to see if I can achieve the same good result .





73 de LA5VNA Steinar



,

'

On 02.10.2011 20:36, Patrick Lindecker wrote:

> Hello Steinar,

>

> With Multipsk, you can RX/TX up in VLF from 0 to 24 KHZ in SdR mode in all

> the digital modes available (RS ID and Call ID available only from 0 to 22

> KHz). If you receive and transmit in a mono way (so a "real" signal), you

> will simply use one side (USB for example), the other side (LSB) being the

> symmetrical to the USB side.

>

> Try JT65, THROBX and PSKAM10, the most sensitive modes under Multipsk.

>

> 73

> Patrick

>

> -----Message d'origine-----

> De : digitalradio@yahoogroups.com [mailto:digitalradio@yahoogroups.com] De

> la part de Steinar Aanesland

> Envoy. : dimanche 2 octobre 2011 12:48

> . : * Digitalradio; * Multipsk

> Objet : [digitalradio] A test of cmsk on 8.97kHz

>

>

> Hi all,

>

> The last few days I've been doing some digi mode testing at 8.97 khz;

> "dreamers band", mostly with use of the QRSS mode.

>

> On the transmitter side, I have been using a 5 turn 10 x 10 m antenna

> and an audio amplifier 100W. The system is feeded with a signal from the

> program "Spectrum Lab".

>

> On the receiver side, I have been using a 70 x 70 cm 60 turns loop,

> tuned with a capacitor. The loop was connected to the microphone input

> on my laptop and decoded with "Spectrum Lab".

>

> The result has been interesting . With this simple arrangement, I have

> reach a distance of 2.5 km.

>

> Yesterday I tried out CMSK8 made by ZL1BPU Murray. I had to make some

> changes in the ini-file to get the CMSK work om 8.97khz. The sampling

> rate was adjusted with the program CheckSR and the transmitting

> frequency was set to 8970Hz. Waterfall has a 2000Hz limit so this was

> black and useless on 8790Hz.

>

> It would makes it easier to track the signal if the developer could

> extend waterfall to 10 kHz. Iam aware that one can get the view of the

> waterfall by going down in frequency, but 8.97khz has become a de facto

> water hole of VLF .

>

> The result was exciting. A clean copy of the signal was received at

> about 2 km.

>

> I would also try to test out some of the VLF mode in multipsk ,

> especially PSK10 and PSKAM10, but I have not find a way to fool the

> program to work on 8.97Khz yet.

>

> 73 and good dx the VLF Steinar la5vna

>

>

>

>

>

>

>

---------------

>

> www.obriensweb.com/digispotter.html

> Chat, Skeds, and "Spots" all in one (resize to suit)

>

> Facebook= www.facebook.com/pages/digitalradio/123270301037522

>

> Yahoo! Groups Links

>

>

>

>

>

>

>



----------------------------

#11376 Oct 3, 2011

Thanks to let the group informed of your experimentations Steinar.



Transmission in VLF: the 0-9 KHz band is not submitted to a licence, but,

consequently, the highest transmitted frequency of MFSK transmission must

not be superior to 9000 Hz.



73

Patrick



-----Message d'origine-----

De.: multipsk@yahoogroups.com [mailto:multipsk@yahoogroups.com] De la part

de Steinar Aanesland

Envoy..: lundi 3 octobre 2011 00:04

..: digitalradio@yahoogroups.com; * Multipsk

Objet.: [multipsk] Re: [digitalradio] A test of cmsk on 8.97kHz



Hi Patrick,



Thank for your feedback . I have made me a lite test lab here running

multipsk in SdR mode . I am using my 10x10m loop antenna in the garden

to transmit but I am only using a small piece of wire into the mic om

my "receiver lap top " in the shack. To simulated a transmission I am

turning the power of the amplifier down to an minimum. It is amazing how

well your mode is working . Tomorrow I am going to test pskam10 and

throbx in the field to see if I can achieve the same good result .





73 de LA5VNA Steinar



,

'

On 02.10.2011 20:36, Patrick Lindecker wrote:

> Hello Steinar,

>

> With Multipsk, you can RX/TX up in VLF from 0 to 24 KHZ in SdR mode in all

> the digital modes available (RS ID and Call ID available only from 0 to 22

> KHz). If you receive and transmit in a mono way (so a "real" signal), you

> will simply use one side (USB for example), the other side (LSB) being the

> symmetrical to the USB side.

>

> Try JT65, THROBX and PSKAM10, the most sensitive modes under Multipsk.

>

> 73

> Patrick

>

> -----Message d'origine-----

> De : digitalradio@yahoogroups.com [mailto:digitalradio@yahoogroups.com] De

> la part de Steinar Aanesland

> Envoy. : dimanche 2 octobre 2011 12:48

> . : * Digitalradio; * Multipsk

> Objet : [digitalradio] A test of cmsk on 8.97kHz

>

>

> Hi all,

>

> The last few days I've been doing some digi mode testing at 8.97 khz;

> "dreamers band", mostly with use of the QRSS mode.

>

> On the transmitter side, I have been using a 5 turn 10 x 10 m antenna

> and an audio amplifier 100W. The system is feeded with a signal from the

> program "Spectrum Lab".

>

> On the receiver side, I have been using a 70 x 70 cm 60 turns loop,

> tuned with a capacitor. The loop was connected to the microphone input

> on my laptop and decoded with "Spectrum Lab".

>

> The result has been interesting . With this simple arrangement, I have

> reach a distance of 2.5 km.

>

> Yesterday I tried out CMSK8 made by ZL1BPU Murray. I had to make some

> changes in the ini-file to get the CMSK work om 8.97khz. The sampling

> rate was adjusted with the program CheckSR and the transmitting

> frequency was set to 8970Hz. Waterfall has a 2000Hz limit so this was

> black and useless on 8790Hz.

>

> It would makes it easier to track the signal if the developer could

> extend waterfall to 10 kHz. Iam aware that one can get the view of the

> waterfall by going down in frequency, but 8.97khz has become a de facto

> water hole of VLF .

>

> The result was exciting. A clean copy of the signal was received at

> about 2 km.

>

> I would also try to test out some of the VLF mode in multipsk ,

> especially PSK10 and PSKAM10, but I have not find a way to fool the

> program to work on 8.97Khz yet.

>

> 73 and good dx the VLF Steinar la5vna

>

>

>

>

>

>

>

---------------

>

> www.obriensweb.com/digispotter.html

> Chat, Skeds, and "Spots" all in one (resize to suit)

>

> Facebook= www.facebook.com/pages/digitalradio/123270301037522

>

> Yahoo! Groups Links

>

>

>

>

>

>

>









---------------



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