[digitalradio] CMSK successful tests on 600m
I ran 200W of CMSK8 for two hours last night, with 100% copy at VK2DDI (2200km range) and good copy with very deep fades at ZL2AFP (500km range). Copy was good in VK2 well before sunset. Later in the evening a test with 50W of CMSK63 was also 100% copy for long periods at both locations. The transmissions were on 508.150kHz. I used a Redifon DU505 exciter. The transmitter is Class D H-bridge and the antenna a base loaded inverted L with 7.5m upwire, and three 30m top wires. Both receiving stations used PA0RDT mini-whip antennas. 73, Murray ZL1BPU
Re: [digitalradio] CMSK successful tests on 600m
Pretty impressive , Murray. Thanks for the update. Andy K3UK On Mon, Aug 30, 2010 at 6:34 PM, zl1...@nzart.org.nz wrote: I ran 200W of CMSK8 for two hours last night, with 100% copy at VK2DDI (2200km range) and good copy with very deep fades at ZL2AFP (500km range). Copy was good in VK2 well before sunset. Later in the evening a test with 50W of CMSK63 was also 100% copy for long periods at both locations. The transmissions were on 508.150kHz. I used a Redifon DU505 exciter. The transmitter is Class D H-bridge and the antenna a base loaded inverted L with 7.5m upwire, and three 30m top wires. Both receiving stations used PA0RDT mini-whip antennas. 73, Murray ZL1BPU R zl1...@nzart.org.nz?subject=cmsk+successful+tests+on+600m
[digitalradio] CMSK Freq's
I know CMSK is mainly for 160/80 metes (which I currently can't do), but what freq's are being used currently on the other bands/ thanks and 73 Kurt
[digitalradio] CMSK Program
Well been home from the hospital for a week for Knee replacement, all is well and it time to get back testing, I just download CMSK program and now where is all the testing going on at, I saw something about 10136 ?.. Can somwone let me know where to be looking?.and what 8,31,63,125 baud. Thanks Russell NC5O 1- Whoever said nothing is impossible never tried slamming a revolving door! 2- A government big enough to give you everything you want, is strong enough to take everything you have. - Gerald Ford IN GOD WE TRUST Russell Blair (NC5O) Skype-Russell.Blair Hell Field #300 DRCC #55 30m Dig-group #693 Digital Mode Club #03198
Re: [digitalradio] CMSK
Hi guys, I've installed it on two laptops and got them talking across the room. Anybody is willing to play real in near future?? Best may be 20 m and US early evening. BTW the condx are very good right now. 73 Patrick VK2PN On 10/08/2010 13:25, Andy obrien wrote: Thanks Sholto, going to give it a try Andy On Mon, Aug 9, 2010 at 6:38 PM, sholtofish sho...@probikekit.com mailto:sho...@probikekit.com wrote: Interesting new software from Con New narrow-band mode for LF/MF released Con Wassilieff ZL2AFP has recently released a new narrow-band digital mode, CMSK, designed specifically for the LF and MF ham radio bands (2200, 600 and 160m). SNIP -- ~~ Patrick VK2PN WCC #31 EPC #10566 NAQCC #4433 FISTS #14119 Sydney QF56pe
[digitalradio] CMSK - Up and Running
-- Forwarded message -- From: Phil Williams Two initial contacts via CMSK 63 - N4UM and K4UI. We are learning how to tune correctly. Currently done on 10136.00 + 1000 hz -- Philw de KA1GMN __
[digitalradio] CMSK
Interesting new software from Con New narrow-band mode for LF/MF released Con Wassilieff ZL2AFP has recently released a new narrow-band digital mode, CMSK, designed specifically for the LF and MF ham radio bands (2200, 600 and 160m). The mode uses MSK modulation, familiar to LF and MF listeners as the mode most used by commercial and military transmissions. One major advantage of MSK is that unlike PSK, it does not require linear amplification to maintain narrow bandwidth. The new ZL2AFP CMSK mode can be described as Correlated, Convolved Minimum Shift Keying, and uses a full-time NASA standard convolutional coder with a generous interleaver to provide impressive QRN resistance. Synchronism is assured, even on very weak signals, by a transmitted PN-sequence frame marker and cross-correlator at the receiver. Four modes have been provided, from 125 baud (200Hz bandwidth, 60 WPM) down to 7.8 baud (12.5Hz bandwidth, 4WPM). The narrowest and slowest mode is intended for beacon applications, and can be received 100% at -21dB S/N in 3kHz bandwidth. The default mode, CMSK63, has been reliably copied across the Tasman, at a range of 2200km on 600m from a transmission well under 1W EIRP. Software for this new mode is now available from www.qsl.net/zl1bpu/CMSK/cmsk.htm, where a description of the design is also given. Murray Greenman ZL1BPU/ZL1EE
Re: [digitalradio] CMSK
Thanks Sholto, going to give it a try Andy On Mon, Aug 9, 2010 at 6:38 PM, sholtofish sho...@probikekit.com wrote: Interesting new software from Con New narrow-band mode for LF/MF released Con Wassilieff ZL2AFP has recently released a new narrow-band digital mode, CMSK, designed specifically for the LF and MF ham radio bands (2200, 600 and 160m). The mode uses MSK modulation, familiar to LF and MF listeners as the mode most used by commercial and military transmissions. One major advantage of MSK is that unlike PSK, it does not require linear amplification to maintain narrow bandwidth. The new ZL2AFP CMSK mode can be described as Correlated, Convolved Minimum Shift Keying, and uses a full-time NASA standard convolutional coder with a generous interleaver to provide impressive QRN resistance. Synchronism is assured, even on very weak signals, by a transmitted PN-sequence frame marker and cross-correlator at the receiver. Four modes have been provided, from 125 baud (200Hz bandwidth, 60 WPM) down to 7.8 baud (12.5Hz bandwidth, 4WPM). The narrowest and slowest mode is intended for beacon applications, and can be received 100% at -21dB S/N in 3kHz bandwidth. The default mode, CMSK63, has been reliably copied across the Tasman, at a range of 2200km on 600m from a transmission well under 1W EIRP. Software for this new mode is now available from www.qsl.net/zl1bpu/CMSK/cmsk.htm, where a description of the design is also given. Murray Greenman ZL1BPU/ZL1EE
