I now have 2m, 70cm and 2.4ghz antennas for satellites. The radio is a Ft-847 with receive SSB preamps on V and U bands.
I have a BBQ dish with a SSB 2.4 ghz downconverter. That will work fine with P3E (it did with AO-40). Could I still use the same dish for S Band uplink on Eagle? I would need some form of a upconverter (from 70cm to 2.4 ghz) plus a amp, to make that work?
If I am using the S band for the uplink which band am I using for the downlink? 2m or 70cm?
Les W4SCO
It depends on the dish size. If you look at the San Diego meeting notes in EaglePedia, you'll see that the proposal is a digital S/C trasponder to support 4800 bps with a 2-foot dish and 256 kbps with a 6-foot dish. This assumes a CP feed. Multiply by 1.4 for linear polarization. There is also a proposal for a low-speed mode B digital service that works with small fixed antennas. The 4.8 and 256 kbps services use wideband uplink and downlink signals so the microwave radio will likely be something that plugs into a USB port and does as much as possible in the PC.
73,
John KD6OZH
----- Original Message ----- From: sco@sco-inc.com To: amsat-bb@amsat.org Sent: Friday, September 15, 2006 05:28 UTC Subject: [amsat-bb] S Band UP
I now have 2m, 70cm and 2.4ghz antennas for satellites. The radio is a Ft-847 with receive SSB preamps on V and U bands.
I have a BBQ dish with a SSB 2.4 ghz downconverter. That will work fine with P3E (it did with AO-40). Could I still use the same dish for S Band uplink on Eagle? I would need some form of a upconverter (from 70cm to 2.4 ghz) plus a amp, to make that work?
If I am using the S band for the uplink which band am I using for the downlink? 2m or 70cm?
Les W4SCO
Sent via AMSAT-BB@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
----- Original Message ----- From: sco@sco-inc.com To: amsat-bb@amsat.org Sent: Friday, September 15, 2006 7:28 AM Subject: [amsat-bb] S Band UP
I now have 2m, 70cm and 2.4ghz antennas for satellites. The radio is a Ft-847 with receive SSB preamps on V and U bands.
I have a BBQ dish with a SSB 2.4 ghz downconverter. That will work fine with P3E (it did with AO-40). Could I still use the same dish for S Band uplink on Eagle?
Hi Les, W4SCO
For the uplink on Eagle you should transmit some where between 2400 to 2450 MHz and as far I know the exact frequency segment has been not yet published.
If the uplink of EAGLE will be made between 2400 to 2402 MHz then to use the same dish of P3E you need a coax relay at your dish with the common port C connected to the feed. The NC contact will be connected to input of your actual S-band downconverter and the NO contact must be connected to your S-band TX amplifier a not easy task if you run a long transmission line because in this case the TX amplifier must be antenna mounted.
Probably to uplink the S-band on EAGLE a separate dish which size depends on your needs is easyer. (look at EaglePedia)
I would need some form of a upconverter
(from 70cm to 2.4 ghz) plus a amp, to make that work?
You don't want to use P3T and Eagle at the same time and so for EAGLE you need an upconverter from 2 meters to 2.4 GHz + a power amplifier antenna mounted depending on your transmission line losses (I have a 144-146 MHz to 2400-2402 MHz transverter + 10 watt linear amplifier mounted at the dish for AO40) and so if EAGLE will likely use an uplink between 2400 to 2402 MHz I will be very luky.
If I am using the S band for the uplink which band am I using for the downlink? 2m or 70cm?
The downlink of EAGLE will be made some where between 5830 to 5850 MHz and as far I know the exact frequency segment has been not yet decided but you need a downconverter specifically designed to receive the above band when it will be chosen. Now if your 2.4 GHz upconverter uses a 2 meter IF then you must use a 70 cm IF for your 5.8 GHz downconverter. A 70 cm IF allow you to get a better receiver image rejection on downlink while not to be IF to IF interfered using a 2 meters IF for the uplink.
Les W4SCO
73" de
i8CVS Domenico
So it looks like I will keep my 2m yagi on one end of my 8 ft boom and the 70cm yagi on the other end. My S band P3E downlink dish on one side of the rotor and the new Eagle S band uplink dish on the other side.
What do I need for the C band downlink antenna? I will not have room for a third dish on my boom. Can I have the new dish work for both S band uplink and C band downlink on Eagle?
Les W4SCO
The downlink of EAGLE will be made some where between 5830 to 5850 MHz
and as far I know the exact frequency segment has been not yet decided but you need a downconverter specifically designed to receive the above band when it will be chosen. Now if your 2.4 GHz upconverter uses a 2 meter IF then you must use a 70 cm IF for your 5.8 GHz downconverter. A 70 cm IF allow you to get a better receiver image rejection on downlink while not to be IF to IF interfered using a 2 meters IF for the uplink.
Won't this (5830-5850) C Band downlink for Eagle be the same problem as S band? I changed all my cordless phones (4 of them) to the 5.8 ghz band so they would not crash my 2.4 ghz wireless network. Won't my 5.8 ghz phones interfere with hearing Eagle on the 5.8 ghz band? My Linksys 2.4 network did not bother my 2.4 ghz old phones but the old 2.4 ghz phones brought down my network. The phones are a lot more powerful then the network. I assume the same is the case for my new 5.8 ghz phones.
I guess for satelltes (Eagle anyway) I will just use U/V mode and keep my phones and network the way they are. I could have used S band down but i really doubt i will be able to use C band down (along with all my cordless phones on the same band).
Les W4SCO
Are there any upconverters from 6 meters to 13cm? Or, from 6m to 23cm?
My equipment for that band gets very little use (10w and a dipole is all I have, and there's not much Es out here in the west). That also solves the problem with the downlink IFs, with 6m being neither of the popular ones.
I did some browsing and Googling, and didn't find anything.
Greg KO6TH
----Original Message Follows---- From: "i8cvs" domenico.i8cvs@tin.it To: "AMSAT-BB" amsat-bb@amsat.org, sco@sco-inc.com Subject: [amsat-bb] Re: S Band UP Date: Fri, 15 Sep 2006 13:03:11 +0200
----- Original Message ----- From: sco@sco-inc.com To: amsat-bb@amsat.org Sent: Friday, September 15, 2006 7:28 AM Subject: [amsat-bb] S Band UP
I now have 2m, 70cm and 2.4ghz antennas for satellites. The radio is a Ft-847 with receive SSB preamps on V and U bands.
I have a BBQ dish with a SSB 2.4 ghz downconverter. That will work fine with P3E (it did with AO-40). Could I still use the same dish for S Band uplink on Eagle?
Hi Les, W4SCO
For the uplink on Eagle you should transmit some where between 2400 to 2450 MHz and as far I know the exact frequency segment has been not yet published.
If the uplink of EAGLE will be made between 2400 to 2402 MHz then to use the same dish of P3E you need a coax relay at your dish with the common port C connected to the feed. The NC contact will be connected to input of your actual S-band downconverter and the NO contact must be connected to your S-band TX amplifier a not easy task if you run a long transmission line because in this case the TX amplifier must be antenna mounted.
Probably to uplink the S-band on EAGLE a separate dish which size depends on your needs is easyer. (look at EaglePedia)
I would need some form of a upconverter
(from 70cm to 2.4 ghz) plus a amp, to make that work?
You don't want to use P3T and Eagle at the same time and so for EAGLE you need an upconverter from 2 meters to 2.4 GHz + a power amplifier antenna mounted depending on your transmission line losses (I have a 144-146 MHz to 2400-2402 MHz transverter + 10 watt linear amplifier mounted at the dish for AO40) and so if EAGLE will likely use an uplink between 2400 to 2402 MHz I will be very luky.
If I am using the S band for the uplink which band am I using for the downlink? 2m or 70cm?
The downlink of EAGLE will be made some where between 5830 to 5850 MHz and as far I know the exact frequency segment has been not yet decided but you need a downconverter specifically designed to receive the above band when it will be chosen. Now if your 2.4 GHz upconverter uses a 2 meter IF then you must use a 70 cm IF for your 5.8 GHz downconverter. A 70 cm IF allow you to get a better receiver image rejection on downlink while not to be IF to IF interfered using a 2 meters IF for the uplink.
Les W4SCO
73" de
i8CVS Domenico
_______________________________________________ Sent via AMSAT-BB@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
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