Dear all,
I was considering to submit the following mode to the AO51 command team. (I did this already a while ago but my emails seems to bounce)
Objective: provide a means for stations with small ERP to test their 23cm uplink channel into AO51.
Uplink 23cm SSB (!) Downlink 70cm FM (preferably 435.300)
With 23cm FM uplink I seem not to have enough ERP to get over the sat. That is, I never made it through the squelch level of the AO51 receiver (using Kenwood TS2000X/10W, and a small cubicle quad antenna only).
In SSB mode with the squelch open I could try even CW to see how weak my uplink is. Maybe just below squelch level, maybe far down in the noise. And: with SSB we can even have multiple stations testing their links at the same time !
Any thoughts of anyone else before I submit this request ?
Henk, PA3GUO (... and I have a 33 elements beam now)
Hi Henk,
I always like to try new modes, but are you sure that your uplink isn't working? I've got an ICOM 1271A, which also runs 10w. It feeds a homemade 18 turn helix (http://home.wavecable.com/~ko6th/IMG_0138.JPG) after about 60' of 1/2" hardline and another 10' of RG-8-like stuff to get out of the house, and to run around the rotor. There can't be much left of the signal after all that, and I have no problem getting into AO-51 with this setup, even at low elevations (long distance). I heard myself this evening down below 10 degrees with it.
Are you able to hear the downlink when others are on the bird? The hardest part for me with mode LS has been on the "S" side - finding the downlink and tracking it through fades and the nasty doppler shift. My downconverter is off by about 50khz, and the IF receiver is a bit deaf, which doesn't help either.
But, if you can hear the downlink, perhaps it is the uplink that is at issue. What sort of cable run do you have between the rig and the antenna? How many elements in the quad?
Greg KO6TH
----------------------------------------
Date: Tue, 9 Sep 2008 07:36:41 +0200 From: [email protected] To: [email protected] CC: [email protected] Subject: [amsat-bb] AO51 mode: 23cm SSB up / 70cm FM down ?
Dear all,
I was considering to submit the following mode to the AO51 command team. (I did this already a while ago but my emails seems to bounce)
Objective: provide a means for stations with small ERP to test their 23cm uplink channel into AO51.
Uplink 23cm SSB (!) Downlink 70cm FM (preferably 435.300)
With 23cm FM uplink I seem not to have enough ERP to get over the sat. That is, I never made it through the squelch level of the AO51 receiver (using Kenwood TS2000X/10W, and a small cubicle quad antenna only).
In SSB mode with the squelch open I could try even CW to see how weak my uplink is. Maybe just below squelch level, maybe far down in the noise. And: with SSB we can even have multiple stations testing their links at the same time !
Any thoughts of anyone else before I submit this request ?
Henk, PA3GUO (... and I have a 33 elements beam now)
Sent via [email protected]. 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
_________________________________________________________________ Get more out of the Web. Learn 10 hidden secrets of Windows Live. http://windowslive.com/connect/post/jamiethomson.spaces.live.com-Blog-cns!55...
Hi Greg !
You are absolutely right: the objective is to test my 23cm uplink channel.
We could experiment with reduced power, smaller antennas etc. This is why I would request the receiver of AO51 to be in SSB receive mode.
My previous antenna was (which didnt make it through AO51): http://www.pa3guo.com/quad23cm.html
My current antenna (that I havent tried yet via AO51 mode LU): http://www.pa3guo.com/cute_ant_pa3guo.jpg
Henk, PA3GUO http://www.pa3guo.com
Hi Henk,
I always like to try new modes, but are you sure that your uplink isn't working? I've got an ICOM 1271A, which also runs 10w. It feeds a homemade 18 turn helix (http://home.wavecable.com/~ko6th/IMG_0138.JPG) after about 60' of 1/2" hardline and another 10' of RG-8-like stuff to get out of the house, and to run around the rotor. There can't be much left of the signal after all that, and I have no problem getting into AO-51 with this setup, even at low elevations (long distance). I heard myself this evening down below 10 degrees with it.
Are you able to hear the downlink when others are on the bird? The hardest part for me with mode LS has been on the "S" side - finding the downlink and tracking it through fades and the nasty doppler shift. My downconverter is off by about 50khz, and the IF receiver is a bit deaf, which doesn't help either.
But, if you can hear the downlink, perhaps it is the uplink that is at issue. What sort of cable run do you have between the rig and the antenna? How many elements in the quad?
Greg KO6TH
Date: Tue, 9 Sep 2008 07:36:41 +0200 From: [email protected] To: [email protected] CC: [email protected] Subject: [amsat-bb] AO51 mode: 23cm SSB up / 70cm FM down ?
Dear all,
I was considering to submit the following mode to the AO51 command team. (I did this already a while ago but my emails seems to bounce)
Objective: provide a means for stations with small ERP to test their 23cm uplink channel into AO51.
Uplink 23cm SSB (!) Downlink 70cm FM (preferably 435.300)
With 23cm FM uplink I seem not to have enough ERP to get over the sat. That is, I never made it through the squelch level of the AO51 receiver (using Kenwood TS2000X/10W, and a small cubicle quad antenna only).
In SSB mode with the squelch open I could try even CW to see how weak my uplink is. Maybe just below squelch level, maybe far down in the noise. And: with SSB we can even have multiple stations testing their links at the same time !
Any thoughts of anyone else before I submit this request ?
Henk, PA3GUO (... and I have a 33 elements beam now)
Sent via [email protected]. 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
Get more out of the Web. Learn 10 hidden secrets of Windows Live. http://windowslive.com/connect/post/jamiethomson.spaces.live.com-Blog-cns!55...
We did get your request, sorry if we didn't reply. As Ib has already indicated there is no squelch on the receiver on L band. The power and antenna you describe should be good enough to access the satellite on FM, especially at time of closest approach. The Doppler tuning is very important!
I'll see if the -modes group is amenable to running a few days of the L/U mode at the end of the month with a SSB uplink. If so, I'll let the -bb know, and of course change the text schedule on the webpage. Be sure to check the -text- schedule, as I do not believe the graphic one has a L SSB option.
73, Drew KO4MA
----- Original Message ----- From: "Henk, PA3GUO" [email protected] To: [email protected] Cc: [email protected] Sent: Tuesday, September 09, 2008 1:36 AM Subject: [amsat-bb] AO51 mode: 23cm SSB up / 70cm FM down ?
Dear all,
I was considering to submit the following mode to the AO51 command team. (I did this already a while ago but my emails seems to bounce)
Objective: provide a means for stations with small ERP to test their 23cm uplink channel into AO51.
Uplink 23cm SSB (!) Downlink 70cm FM (preferably 435.300)
With 23cm FM uplink I seem not to have enough ERP to get over the sat. That is, I never made it through the squelch level of the AO51 receiver (using Kenwood TS2000X/10W, and a small cubicle quad antenna only).
In SSB mode with the squelch open I could try even CW to see how weak my uplink is. Maybe just below squelch level, maybe far down in the noise. And: with SSB we can even have multiple stations testing their links at the same time !
Any thoughts of anyone else before I submit this request ?
Henk, PA3GUO (... and I have a 33 elements beam now)
Sent via [email protected]. 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
Hi Drew,
Thanks a lot - I will prepare myself and monitor the text schedule !
Henk, PA3GUO
We did get your request, sorry if we didn't reply. As Ib has already indicated there is no squelch on the receiver on L band. The power and antenna you describe should be good enough to access the satellite on FM, especially at time of closest approach. The Doppler tuning is very important!
I'll see if the -modes group is amenable to running a few days of the L/U mode at the end of the month with a SSB uplink. If so, I'll let the -bb know, and of course change the text schedule on the webpage. Be sure to check the -text- schedule, as I do not believe the graphic one has a L SSB option.
73, Drew KO4MA
----- Original Message ----- From: "Henk, PA3GUO" [email protected] To: [email protected] Cc: [email protected] Sent: Tuesday, September 09, 2008 1:36 AM Subject: [amsat-bb] AO51 mode: 23cm SSB up / 70cm FM down ?
Dear all,
I was considering to submit the following mode to the AO51 command team. (I did this already a while ago but my emails seems to bounce)
Objective: provide a means for stations with small ERP to test their 23cm uplink channel into AO51.
Uplink 23cm SSB (!) Downlink 70cm FM (preferably 435.300)
With 23cm FM uplink I seem not to have enough ERP to get over the sat. That is, I never made it through the squelch level of the AO51 receiver (using Kenwood TS2000X/10W, and a small cubicle quad antenna only).
In SSB mode with the squelch open I could try even CW to see how weak my uplink is. Maybe just below squelch level, maybe far down in the noise. And: with SSB we can even have multiple stations testing their links at the same time !
Any thoughts of anyone else before I submit this request ?
Henk, PA3GUO (... and I have a 33 elements beam now)
Sent via [email protected]. 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
participants (3)
-
Andrew Glasbrenner -
Greg D. -
Henk, PA3GUO