[amsat-bb] Re: AO-51 L/U
David and the BB, There is a published schedule that says that L/U is subject to interruption for telemetry collection. I sent out a note to the BB earlier today explaining the problem I am having getting the satellite ready for this weekend. The 22:30 pass only affected those in the eastern US, I don't plan on changing L/U during the 00:00 pass that covers a larger area. The only schedule I can give you is that I will work on the satellite until I feel that it will give solid operation for this weekend, which I hope will be in the next 24 hours. 73, Gould, WA4SXM - Original Message - From: "David - KG4ZLB" To: Cc: "Andrew Glasbrenner" ; "Gould Smith" ; Sent: Monday, June 22, 2009 6:43 PM Subject: Re: [amsat-bb] Re: AO-51 L/U > Listening on the 22:24utc pass of AO-51 just now and for the second day > running, the sudden distinct change in sound reception tells me that the > analogue signal is being switched over to digital for TLM collection just > as it gets to me in Florida. > > If this is so then could we have a schedule of what passes TLM is going to > be collected please - we only get a few days to work mode L and I am 0 for > 2 and I can not be bothered to waste time if the published schedule is > not going to be adhered too! > > If its just not working in L/U then forget the rant! > > Thanks > > -- > David > KG4ZLB > www.kg4zlb.com > > > > n...@bellsouth.net wrote: >> Thanks for this Drew. I have just seen that designation on the AO-51 >> information page (the one linked to the status page on the AMSAT site) >> for the first time, although I've made countless visits to that page over >> the past year. >> >> For those who will operating Field Day from remote/portable sites and >> using antennas like the Elk or Arrow, you may wish to check out this PDF, >> which I found on the Cushcraft Web site: >> >> http://www.cushcraft.com/comm/support/pdf/Antenna-Polarization-14B32.pdf >> >> After reading it, I believe that AO-51 could prove to be more challenging >> to work than usual this weekend, given a TX output in the SO-50 >> neighborhood and the antenna mismatch many of us will be dealing with >> (i.e., linear polarized antenna at the ground station vs. circularly >> polarized at the satellite). >> >> If I misread the document and have drawn inaccurate conclusions, I hope >> someone will post a correction. However, it seems to me like this >> provides all the more reason for us to focus on AO-7, FO-29 and VO-52 if >> we can. >> >> Thanks to all, >> >> Tim - N3TL >> -- Original message from "Andrew Glasbrenner" >> : -- >> >> >> ___ >> Sent via amsat...@amsat.org. Opinions expressed are those of the author. >> Not an AMSAT-NA member? Join now to support the amateur satellite >> program! >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb >> >> > > -- > David > KG4ZLB > www.kg4zlb.com > ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 L/U
Listening on the 22:24utc pass of AO-51 just now and for the second day running, the sudden distinct change in sound reception tells me that the analogue signal is being switched over to digital for TLM collection just as it gets to me in Florida. If this is so then could we have a schedule of what passes TLM is going to be collected please - we only get a few days to work mode L and I am 0 for 2 and I can not be bothered to waste time if the published schedule is not going to be adhered too! If its just not working in L/U then forget the rant! Thanks -- David KG4ZLB www.kg4zlb.com n...@bellsouth.net wrote: > Thanks for this Drew. I have just seen that designation on the AO-51 > information page (the one linked to the status page on the AMSAT site) for > the first time, although I've made countless visits to that page over the > past year. > > For those who will operating Field Day from remote/portable sites and using > antennas like the Elk or Arrow, you may wish to check out this PDF, which I > found on the Cushcraft Web site: > > http://www.cushcraft.com/comm/support/pdf/Antenna-Polarization-14B32.pdf > > After reading it, I believe that AO-51 could prove to be more challenging to > work than usual this weekend, given a TX output in the SO-50 neighborhood and > the antenna mismatch many of us will be dealing with (i.e., linear polarized > antenna at the ground station vs. circularly polarized at the satellite). > > If I misread the document and have drawn inaccurate conclusions, I hope > someone will post a correction. However, it seems to me like this provides > all the more reason for us to focus on AO-7, FO-29 and VO-52 if we can. > > Thanks to all, > > Tim - N3TL > -- Original message from "Andrew Glasbrenner" > : -- > > > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > -- David KG4ZLB www.kg4zlb.com ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] WTB: Bird 4410-15 dlement
Still looking for a Bird 4410-15 element for the Bird 4410A wattmeter. This is a 100W element covering 1.0 to 1.8 ghz. 73, Joe W2KJ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AMSAT on Twitter
Geat news, Drew. Thanks for setting this up. Tim -- Original message from "Andrew Glasbrenner" : -- > AMSAT now has a Twitter account, and can be found at > http://twitter.com/AMSAT . I'll try to tweet things too small for ANS or > email, but of interest to the general AMSAT community. To begin with they > may be mostly about AO-51 and AO-7. All are welcome to follow us. > > 73, Drew KO4MA > AMSAT VP Ops > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AMSAT on Twitter
The Twitter feed to RSS works well, also. Alan WA4SCA ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] AMSAT on Twitter
AMSAT now has a Twitter account, and can be found at http://twitter.com/AMSAT . I'll try to tweet things too small for ANS or email, but of interest to the general AMSAT community. To begin with they may be mostly about AO-51 and AO-7. All are welcome to follow us. 73, Drew KO4MA AMSAT VP Ops ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] AO-7 over Brasil
During the last week, all the AO-7 morning passes over Brasil are not good: very weak and distorted signal. But all the evening passes are OK: very good signal. What´s hapening ? 73 de Roland PY4ZBZ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 adjustments
Thanks for this Drew. I have just seen that designation on the AO-51 information page (the one linked to the status page on the AMSAT site) for the first time, although I've made countless visits to that page over the past year. For those who will operating Field Day from remote/portable sites and using antennas like the Elk or Arrow, you may wish to check out this PDF, which I found on the Cushcraft Web site: http://www.cushcraft.com/comm/support/pdf/Antenna-Polarization-14B32.pdf After reading it, I believe that AO-51 could prove to be more challenging to work than usual this weekend, given a TX output in the SO-50 neighborhood and the antenna mismatch many of us will be dealing with (i.e., linear polarized antenna at the ground station vs. circularly polarized at the satellite). If I misread the document and have drawn inaccurate conclusions, I hope someone will post a correction. However, it seems to me like this provides all the more reason for us to focus on AO-7, FO-29 and VO-52 if we can. Thanks to all, Tim - N3TL -- Original message from "Andrew Glasbrenner" : -- > TXa refers to the 435.150 downlink, and TXb to 435.300, regardless of the > uplink or configuration. The power levels should be roughly the same for > Field Day. > > 73, Drew KO4MA > > - Original Message - > From: > To: "Gould Smith" ; > Sent: Monday, June 22, 2009 10:40 AM > Subject: [amsat-bb] Re: AO-51 adjustments > > > > Thanks for the information Gould. > > > > Will you clarify, please, that TXA is the normal U/V configuration - and > > also that these are the power levels we can expect for Field Day? That's > > what I understand from your comments. > > > > Thank you, and thanks for all your efforts to keep AO-51 functioning as > > best as it can given the issues you have to address. > > > > 73 to all, > > > > Tim - N3TL > > -- Original message from "Gould Smith" > > : -- > > > > I am working with the satellite to get the Field Day configuration > > operational > >> long term.. I turned TXB back on during the 1300Z pass. > >> During this pass I adjusted the TX levels to TXA 240 mW and TXB 290 mW. > >> These are lower power levels than I have ever used before, but necessary > >> to get the satellite through the 16+ minute eclipses each orbit. The SQRX > >> receiver uses > >> about 110 mA that must be subtracted from the total TX power used. > >> I think I am close and expect to get the correct settings over the next > >> 24 hours. It is also necessary to change the L/U analog operation to > >> digital over the eastern US in order to download the telemetry to see how > >> the satellite is > >> performing over multiple orbits. > >> > >> 73, > >> Gould, WA4SXM > >> AO-51 Command Station > >> ___ > >> Sent via amsat...@amsat.org. Opinions expressed are those of the author. > >> Not an AMSAT-NA member? Join now to support the amateur satellite > >> program! > >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > ___ > > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > > Not an AMSAT-NA member? Join now to support the amateur satellite program! > > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 adjustments
TXa refers to the 435.150 downlink, and TXb to 435.300, regardless of the uplink or configuration. The power levels should be roughly the same for Field Day. 73, Drew KO4MA - Original Message - From: To: "Gould Smith" ; Sent: Monday, June 22, 2009 10:40 AM Subject: [amsat-bb] Re: AO-51 adjustments > Thanks for the information Gould. > > Will you clarify, please, that TXA is the normal U/V configuration - and > also that these are the power levels we can expect for Field Day? That's > what I understand from your comments. > > Thank you, and thanks for all your efforts to keep AO-51 functioning as > best as it can given the issues you have to address. > > 73 to all, > > Tim - N3TL > -- Original message from "Gould Smith" > : -- > > I am working with the satellite to get the Field Day configuration > operational >> long term.. I turned TXB back on during the 1300Z pass. >> During this pass I adjusted the TX levels to TXA 240 mW and TXB 290 mW. >> These are lower power levels than I have ever used before, but necessary >> to get the satellite through the 16+ minute eclipses each orbit. The SQRX >> receiver uses >> about 110 mA that must be subtracted from the total TX power used. >> I think I am close and expect to get the correct settings over the next >> 24 hours. It is also necessary to change the L/U analog operation to >> digital over the eastern US in order to download the telemetry to see how >> the satellite is >> performing over multiple orbits. >> >> 73, >> Gould, WA4SXM >> AO-51 Command Station >> ___ >> Sent via amsat...@amsat.org. Opinions expressed are those of the author. >> Not an AMSAT-NA member? Join now to support the amateur satellite >> program! >> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 adjustments
Thanks for the information Gould. Will you clarify, please, that TXA is the normal U/V configuration - and also that these are the power levels we can expect for Field Day? That's what I understand from your comments. Thank you, and thanks for all your efforts to keep AO-51 functioning as best as it can given the issues you have to address. 73 to all, Tim - N3TL -- Original message from "Gould Smith" : -- I am working with the satellite to get the Field Day configuration operational > long term.. I turned TXB back on during the 1300Z pass. > During this pass I adjusted the TX levels to TXA 240 mW and TXB 290 mW. These > are lower power levels than I have ever used before, but necessary to get the > satellite through the 16+ minute eclipses each orbit. The SQRX receiver uses > about 110 mA that must be subtracted from the total TX power used. > I think I am close and expect to get the correct settings over the next 24 > hours. It is also necessary to change the L/U analog operation to digital > over the eastern US in order to download the telemetry to see how the > satellite is > performing over multiple orbits. > > 73, > Gould, WA4SXM > AO-51 Command Station > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 Off U/S
Luc and All, I finally started hearing that pass about 1310 utc in Memphis. Leo was talking to someone, but very weak audio and downlink signal. Maybe power cut back with both modes on? Rick - WA4NVM > > > On the 1300Z pass over FN36 there was no signal on 435.300mhz but the data > channel 435.150mhz was on! > > > "-" > > > Luc Leblanc VE2DWE > Skype VE2DWE > www.qsl.net/ve2dwe > WAC BASIC CW PHONE SATELLITE > > > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 Off U/S
I didn't hear either pass this morning. The first one was 38 degrees to the east, the second was 18 degrees to the west. However ... I know of at least one operator who did hear stations on both passes this morning (i.e., 11:25-ish UTC and 13:05-ish UTC) on the 435.300 downlink, and worked some on the first pass. I telephoned him when I didn't hear anything on the first pass, then used the second to troubleshoot potential problems here. When I didn't hear anything by mid-pass (and even at 18 degrees, I routinely hear any of the satellites clearly here), I switched to AO-7 and copied stations in SSB. I tried that with and without my duplexer, and copied both ways. So, it appears as though AO-51 is working, but may not have the transmit power just now we're all used to. 73 to all, Tim - N3TL -- Original message from David - KG4ZLB : -- > According to the website, 435.150 is currently the downlink for 1.2 > uplink on the B side (Mode L/U) - I had a great 80 degree pass last > evening which was showing great promise as the bird approached but I > assume that it was terminated for telemetry collection reasons! > > -- > David > KG4ZLB > www.kg4zlb.com > > > > Luc Leblanc wrote: > On the 1300Z pass over FN36 there was no signal on > 435.300mhz but the data > channel 435.150mhz was on! > > > > > > "-" > > > > > > Luc Leblanc VE2DWE > > Skype VE2DWE > > www.qsl.net/ve2dwe > > WAC BASIC CW PHONE SATELLITE > > > > > > > > ___ > > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > > Not an AMSAT-NA member? Join now to support the amateur satellite program! > > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > > > > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] AO-51 adjustments
I am working with the satellite to get the Field Day configuration operational long term.. I turned TXB back on during the 1300Z pass. During this pass I adjusted the TX levels to TXA 240 mW and TXB 290 mW. These are lower power levels than I have ever used before, but necessary to get the satellite through the 16+ minute eclipses each orbit. The SQRX receiver uses about 110 mA that must be subtracted from the total TX power used. I think I am close and expect to get the correct settings over the next 24 hours. It is also necessary to change the L/U analog operation to digital over the eastern US in order to download the telemetry to see how the satellite is performing over multiple orbits. 73, Gould, WA4SXM AO-51 Command Station ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Re: AO-51 Off U/S
According to the website, 435.150 is currently the downlink for 1.2 uplink on the B side (Mode L/U) - I had a great 80 degree pass last evening which was showing great promise as the bird approached but I assume that it was terminated for telemetry collection reasons! -- David KG4ZLB www.kg4zlb.com Luc Leblanc wrote: > On the 1300Z pass over FN36 there was no signal on 435.300mhz but the data > channel 435.150mhz was on! > > > "-" > > > Luc Leblanc VE2DWE > Skype VE2DWE > www.qsl.net/ve2dwe > WAC BASIC CW PHONE SATELLITE > > > > ___ > Sent via amsat...@amsat.org. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb > > ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] AO-51 Off U/S
On the 1300Z pass over FN36 there was no signal on 435.300mhz but the data channel 435.150mhz was on! "-" Luc Leblanc VE2DWE Skype VE2DWE www.qsl.net/ve2dwe WAC BASIC CW PHONE SATELLITE ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
[amsat-bb] Phase shift keying question
Andy I/Q modulators don't work that way, no free lunch and all that. In newbie terms, an I/Q modulator can be thought of as a special mixer that can modulate a carrier signal with an arbitrary modulation format - i.e. any type of modulation you want - literally. An I/Q modulator has a Local Oscillator input (carrier), an I input and a Q input, and an RF output. The modulation signal (FM, CW, AM, SSB, FSK, PSK or whatever) is applied to both the I and Q inputs, which in turn modulate the LO signal to produce the output signal. The type of modulation is determined by the phase relationship between the I and Q inputs. Couple of simple examples - lets say the modulation signal is a 1kHz sine wave, and we have an LO signal of 144.100MHz. If both I and Q inputs are fed with this signal - in phase - then the output of the I/Q modulator will be AM, at 144.100MHz, modulated at 1kHz - you will hear a 1kHz tone on an AM receiver. If the I and Q inputs are fed 90 degrees out of phase with the same 1kHz tone, then the output of the modulator will be either LSB or USB depending on whether the I signal leads or lags the Q signal. If the receiver is set to 144.100 kHz you will hear a 1kHz tone when set to the appropriate sideband. With slightly more complex phase relationships between the I and Q signals it is possible to generate any type of modulation you want, and from a receiver's point of view you will not know how the modulation was generated. But you can't feed different modulation channels into the I and Q inputs - the output would be a complex mixture of the two which would be un- decipharable. You could try Googling 'IQ modulation' for more information, although some of the explanations are aimed at professional engineers with good maths skills. HTH Grant G8UBN Could anyone please explain, in newbie terms, if it is possible to split a telemetry data stream from a satellite OBC into two data streams, sent simultaneously on two nbfm channels, each PSK with the phase difference between them? I have in mind a conversation which I don't fully understand, about these being the I and Q components, and this offering a doubling of the data rate compared with using one nbfm channel. Grateful for any pointers on or off the -bb many thanks andy G0SFJ ___ Sent via amsat...@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
