[digitalradio] element length
need info on k1of 432-25 antenna. what is the length of the 12th director ? by chance is it the same as the last, i could swap it out and not lose too much. david/wd4kpd [EMAIL PROTECTED]
[digitalradio] Satellite QSOs anyone ?
I've never made a satellite QSO, any mode. Does anyone have a tip of which satellite to use for the easiest one to try first? I have HF , 2M, and 440 all mode capability. Anyone want to try a QSO this weekend? For good passes, how far above the horizon does the bird realistically have to be for an easy contact ? Andy K3UK PS, anyone have an easy to read chart of satellite by name , up/down link frequencies and modes supported ? I have found several but they all seem to contradict each other and require a lot of flipping from one window to another.
[digitalradio] HSCW Bandwidth?
All: Does anyone know the approximate bandwidth for injected audio tone high speed CW? Is there a way to calculate this? Thanks, Tony KT2Q
Re: [digitalradio] HSCW Bandwidth?
*WHAT IS THE BANDWIDTH OF HIGHER-SPEED HSCW? ISN'T IT MUCH WIDER THAN STANDARD FILTERS CAN PASS? The formula given for the bandwidth of a standard CW signal, Bn=B*K, is based on make-break ICW, the on-off keying of a carrier, with the leading and trailing edge of the individual characters shaped by the keying circuits, the bias of the following stages, etc. Thus the formula is usable at the lowest HSCW speeds when make-break keying is used. But today nearly all HSCW is done by keying an injected audio tone. This means that if the transmitter is set up properly (i.e., processor off, nothing overdriven, a proper tone frequency, etc.), the keying is not shaped by keying circuit components or adjustments of the transmitter. Rather, the shape of the rise and fall of the individual characters closely approximates the shape of the injected sine wave audio tone. Thus, the above formula does not apply for tone-injection HSCW operation. This is the reason that even the very-high-speed HSCW will fit in the passband of a standard SSB filter. Of course, misadjusted or overdriven audio or RF stages may cause spurious signals outside of the intended range. But it has proved to be quite easy to generate a good-quality HSCW signal by tone injection within the approximate bandwidth of a standard SSB filter. * On 5/26/07, Tony [EMAIL PROTECTED] wrote: All: Does anyone know the approximate bandwidth for injected audio tone high speed CW? Is there a way to calculate this? Thanks, Tony KT2Q
Re: [digitalradio] Satellite QSOs anyone ?
Try amsat UK for info on orbits etc. Have used Oscar 10 and 50 but try for a contact at the furthest point in orbit, that way it is stationary almost . not so easy on a polar orbit as you have to chase the bird. Don`t know of hand if any birds have an elliptical orbit Oscar 10 was a mistake but one of the best birds ever to fly. Mike GM6OFO Andrew O'Brien [EMAIL PROTECTED] wrote: I've never made a satellite QSO, any mode. Does anyone have a tip of which satellite to use for the easiest one to try first? I have HF , 2M, and 440 all mode capability. Anyone want to try a QSO this weekend? For good passes, how far above the horizon does the bird realistically have to be for an easy contact ? Andy K3UK PS, anyone have an easy to read chart of satellite by name , up/down link frequencies and modes supported ? I have found several but they all seem to contradict each other and require a lot of flipping from one window to another. - Yahoo! Mail is the world's favourite email. Don't settle for less, sign up for your freeaccount today.
[digitalradio] Re: element length
--- In digitalradio@yahoogroups.com, David Michael Gaytko // WD4KPD [EMAIL PROTECTED] wrote: need info on k1of 432-25 antenna. what is the length of the 12th director ? by chance is it the same as the last, i could swap it out and not lose too much. david/wd4kpd [EMAIL PROTECTED] The 12th director on the 432 22 element is 285mm, the 12th on the 432 33 is 287m . I don't have a reference to the K1OF 25 though. Andy K3UK
Re: [digitalradio] Satellite QSOs anyone ?
Thanks Tony. I'll give a listen tonight. I have simply a vertical dual bander antenna for tonight but have acquired satellite Yagi for 2M and 70CM, so will probably try those in a week or so, Andy K3UK On 5/26/07, Tony [EMAIL PROTECTED] wrote: Andy, The AO51 FM satellite is fairly easy to work. The voice uplink is on 145.920 and the downlink is 435.300. It's works much like an FM repeater. Doppler will cause the downlink frequency to shift during the pass so expect to move your VFO as much as 5kHz high at the start and 5kHz low towards the end. Doppler will be closest to the actual downlink frequency during the middle of the pass. There are three passes tonight (Saturday); the closest will begin at 00:56z and end at 01:11z. The bird will be at it's closest point around 00:03z (09:03pm EST). See attached image of AO51's footprint and pass times. The VO-52 satellite is another 'easy sat'. This one has a wide passband and is SSB/CW only. It uses an inverting transponder; LSB on the uplink, USB on the downlink. Let me know if you're interested... See www.amsat.org http://www.amsat.org/amsat-new/satellites/status.php Tony KT2Q Original Message - From: Andrew O'Brien [EMAIL PROTECTED] andrewobrie%40gmail.com To: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com Sent: Saturday, May 26, 2007 1:23 PM Subject: [digitalradio] Satellite QSOs anyone ? I've never made a satellite QSO, any mode. Does anyone have a tip of which satellite to use for the easiest one to try first? I have HF , 2M, and 440 all mode capability. Anyone want to try a QSO this weekend? For good passes, how far above the horizon does the bird realistically have to be for an easy contact ? Andy K3UK PS, anyone have an easy to read chart of satellite by name , up/down link frequencies and modes supported ? I have found several but they all seem to contradict each other and require a lot of flipping from one window to another.
Re: [digitalradio] Satellite QSOs anyone ?
Thanks, good audio clip, What about birds that do digital modes ? Andy On 5/26/07, Tony [EMAIL PROTECTED] wrote: Andy, Anything less than a Yagi and pre-amp is a compromise, but you should be able to hear and work AO-51 with the vertical on the 0056z pass. You can actually work most FM satellites with an HT during a high elevation pass; copy is marginal, but it does work... See attached audio clip... Tony KT2Q - Original Message - From: Andrew O'Brien [EMAIL PROTECTED] andrewobrie%40gmail.com To: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com Sent: Saturday, May 26, 2007 4:13 PM Subject: Re: [digitalradio] Satellite QSOs anyone ? Thanks Tony. I'll give a listen tonight. I have simply a vertical dual bander antenna for tonight but have acquired satellite Yagi for 2M and 70CM, so will probably try those in a week or so, Andy K3UK On 5/26/07, Tony [EMAIL PROTECTED] DXDX%40optonline.net wrote: Andy, The AO51 FM satellite is fairly easy to work. The voice uplink is on 145.920 and the downlink is 435.300. It's works much like an FM repeater. Doppler will cause the downlink frequency to shift during the pass so expect to move your VFO as much as 5kHz high at the start and 5kHz low towards the end. Doppler will be closest to the actual downlink frequency during the middle of the pass. There are three passes tonight (Saturday); the closest will begin at 00:56z and end at 01:11z. The bird will be at it's closest point around 00:03z (09:03pm EST). See attached image of AO51's footprint and pass times. The VO-52 satellite is another 'easy sat'. This one has a wide passband and is SSB/CW only. It uses an inverting transponder; LSB on the uplink, USB on the downlink. Let me know if you're interested... See www.amsat.org http://www.amsat.org/amsat-new/satellites/status.php Tony KT2Q Original Message - From: Andrew O'Brien [EMAIL PROTECTED] andrewobrie%40gmail.com andrewobrie%40gmail.com To: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com digitalradio%40yahoogroups.com Sent: Saturday, May 26, 2007 1:23 PM Subject: [digitalradio] Satellite QSOs anyone ? I've never made a satellite QSO, any mode. Does anyone have a tip of which satellite to use for the easiest one to try first? I have HF , 2M, and 440 all mode capability. Anyone want to try a QSO this weekend? For good passes, how far above the horizon does the bird realistically have to be for an easy contact ? Andy K3UK PS, anyone have an easy to read chart of satellite by name , up/down link frequencies and modes supported ? I have found several but they all seem to contradict each other and require a lot of flipping from one window to another.
Re: [digitalradio] HSCW Bandwidth?
Tony, You should convert WPM to bauds to apply the formula. Simpler, and hoping for the best, use a 1500 Hz keyed tone, it allows for symmetric keying sidebands. As in PSK, do not overdrive anything in the TX chain, and you should get a pretty decent signal. With 1200 Hz wide sidebands, you must send quite snappy CW to exceed that. With proper spectrum keying shaping done in the soundcard, a 2.4 kHz wide filter should be enough to send what will be received with another equal bandwidth filter, which is the most common thing for weak signal receiving nowadays. 73, Jose, CO2JA Andrew O'Brien wrote: *WHAT IS THE BANDWIDTH OF HIGHER-SPEED HSCW? ISN'T IT MUCH WIDER THAN STANDARD FILTERS CAN PASS? The formula given for the bandwidth of a standard CW signal, Bn=B*K, is based on make-break ICW, the on-off keying of a carrier, with the leading and trailing edge of the individual characters shaped by the keying circuits, the bias of the following stages, etc. Thus the formula is usable at the lowest HSCW speeds when make-break keying is used. But today nearly all HSCW is done by keying an injected audio tone. This means that if the transmitter is set up properly (i.e., processor off, nothing overdriven, a proper tone frequency, etc.), the keying is not shaped by keying circuit components or adjustments of the transmitter. Rather, the shape of the rise and fall of the individual characters closely approximates the shape of the injected sine wave audio tone. Thus, the above formula does not apply for tone-injection HSCW operation. This is the reason that even the very-high-speed HSCW will fit in the passband of a standard SSB filter. Of course, misadjusted or overdriven audio or RF stages may cause spurious signals outside of the intended range. But it has proved to be quite easy to generate a good-quality HSCW signal by tone injection within the approximate bandwidth of a standard SSB filter. On 5/26/07, Tony [EMAIL PROTECTED] wrote: All: Does anyone know the approximate bandwidth for injected audio tone high speed CW? Is there a way to calculate this? Thanks, Tony KT2Q __ 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 Participe en Universidad 2008. 11 al 15 de febrero del 2008. Palacio de las Convenciones, Ciudad de la Habana, Cuba http://www.universidad2008.cu
Re: [digitalradio] Satellite QSOs anyone ?
AO-7 and VO-52 can be used for digital modes, and they are quite easy to work. AO-7: 432.125-432.175 uplink, 145.975-145.925 downlink VO-52: 435.220-435.280 uplink, 145.930-145.870 downlink I am able to work both of them with great ease with my horizontal yagis on an azimuth-only rotor, and an in-shack preamp. I once successfully uplinked to AO-7 with 5 watts and a 2m/70cm colinear vertical, VO-52 would have worked even better. I'm available during the evening and early morning hours if you want to set up a sked. I tried to hook up with Tony KT2Q a month or so ago but it didn't work out. -Joe, N8FQ On Sat, 26 May 2007 18:32:31 -0400 Andrew O'Brien [EMAIL PROTECTED] wrote: Thanks, good audio clip, What about birds that do digital modes ? Andy
Re: [digitalradio] Satellite QSOs anyone ?
Thanks Joe. I have a pair of 8X8 cross polarized Yagis (2 and 440) that I will be putting up in a week or so, I'll give you a shout then. Meanwhile I will monitor the downlink frequencies and see what I hear on my vertical. Andy. On 5/26/07, Joe Veldhuis [EMAIL PROTECTED] wrote: AO-7 and VO-52 can be used for digital modes, and they are quite easy to work. AO-7: 432.125-432.175 uplink, 145.975-145.925 downlink VO-52: 435.220-435.280 uplink, 145.930-145.870 downlink I am able to work both of them with great ease with my horizontal yagis on an azimuth-only rotor, and an in-shack preamp. I once successfully uplinked to AO-7 with 5 watts and a 2m/70cm colinear vertical, VO-52 would have worked even better. I'm available during the evening and early morning hours if you want to set up a sked. I tried to hook up with Tony KT2Q a month or so ago but it didn't work out. -Joe, N8FQ On Sat, 26 May 2007 18:32:31 -0400 Andrew O'Brien [EMAIL PROTECTED] andrewobrie%40gmail.com wrote: Thanks, good audio clip, What about birds that do digital modes ? Andy
Re: [digitalradio] Satellite QSOs anyone ?
Tony, you are everywhere!. DX de KT2Q: 14015.8 CT1BOH 0039Z Andy. On 5/26/07, Tony [EMAIL PROTECTED] wrote: Andy, The AO51 FM satellite is fairly easy to work. The voice uplink is on 145.920 and the downlink is 435.300. It's works much like an FM repeater. Doppler will cause the downlink frequency to shift during the pass so expect to move your VFO as much as 5kHz high at the start and 5kHz low towards the end. Doppler will be closest to the actual downlink frequency during the middle of the pass. There are three passes tonight (Saturday); the closest will begin at 00:56z and end at 01:11z. The bird will be at it's closest point around 00:03z (09:03pm EST). See attached image of AO51's footprint and pass times. The VO-52 satellite is another 'easy sat'. This one has a wide passband and is SSB/CW only. It uses an inverting transponder; LSB on the uplink, USB on the downlink. Let me know if you're interested... See www.amsat.org http://www.amsat.org/amsat-new/satellites/status.php Tony KT2Q Original Message - From: Andrew O'Brien [EMAIL PROTECTED] andrewobrie%40gmail.com To: digitalradio@yahoogroups.com digitalradio%40yahoogroups.com Sent: Saturday, May 26, 2007 1:23 PM Subject: [digitalradio] Satellite QSOs anyone ? I've never made a satellite QSO, any mode. Does anyone have a tip of which satellite to use for the easiest one to try first? I have HF , 2M, and 440 all mode capability. Anyone want to try a QSO this weekend? For good passes, how far above the horizon does the bird realistically have to be for an easy contact ? Andy K3UK PS, anyone have an easy to read chart of satellite by name , up/down link frequencies and modes supported ? I have found several but they all seem to contradict each other and require a lot of flipping from one window to another.
[digitalradio] Uiview under Vista
Will Uiview using AGWPE run under Vistia Dan N0ZIZ
