Hello Folks, To work in uplink on the L band without a dedicated radio able to transmit at 1269MHz an upconverter is needed, probably with if input is in 70cm. Someone can suggest me how to use or build? I'm analyzing this way to save money instead of the station upgrade with a new radio. Thank you in advance.
Mario IK1ZQJ
Hi Mario, IK1ZQJ
I can suggest you to buy an SSB Electronics transverter model LT 24S output 1269 - 1271 MHz with an IF input 144-146 MHz, 10 watt output and a spare socket for a second XTAL to extend the band up or down the above centered BW
I have used the LT 24S to drive a pair of 7289 in a cavity amplifier when AO40 was alive and well
But be carefull.......because upconverters and transverters have their limitation in terms of frequency agility and probably it is more convenient for you to buy a second hand tranceiver with a 1200 MHz module installed as I did with a TS-790E at 850,00 Euro's and perfectly working.
73" de
i8CVS Domenico
----- Original Message ----- From: "IK1ZQJ Mario" mhz1575_69-aprs@yahoo.it To: AMSAT-BB@amsat.org Sent: Tuesday, August 25, 2009 11:57 AM Subject: [amsat-bb] 23Cm Up converter
Hello Folks, To work in uplink on the L band without a dedicated radio able to transmit
at 1269MHz an upconverter is needed, probably with if input is in 70cm.
Someone can suggest me how to use or build? I'm analyzing this way to save money instead of the station upgrade with a
new radio.
Thank you in advance.
Mario IK1ZQJ
Hello Domenico I8CVS Tnx for your suggest very appreciated. Yes I agree with you, the transverter needs to have a stable oscillator to work (ocxo, tcxo) and a pa is needed today done also with the semiconductor like module or mosfet. On this last issue I have many project available in my lab. Coming back to the transverter, do you think that the IF in VHF is suitable also when I'm working in mode L/S where the Smode is done through a down converter 2400/144MHz? Sure, have a radio with a third band solve all the problems, probably IC910 newer or the glorius 790. I'm scratching the head to take a decision..
73 Mario IK1ZQJ
Hi Mario,
For L band uplink I use an SSB Electronics UTM 1200DLX. It generates about 15 watts out for 5 watts in. It has a 144MHz input. If I am working mode L/S, I will use my FT-817 for the mode L input, the 5 watts (about 3 to the UTM 1200 on the roof) works fine. That leaves the FT-736 for the 144 MHz IF for the S band downlink. Mode L/U would allow the use of just the FT-736, 144MHz for the UTM 1200 and then receive on the 70cm side.
73, Jerry N0JY
IK1ZQJ Mario wrote:
Hello Domenico I8CVS Tnx for your suggest very appreciated. Yes I agree with you, the transverter needs to have a stable oscillator to work (ocxo, tcxo) and a pa is needed today done also with the semiconductor like module or mosfet. On this last issue I have many project available in my lab. Coming back to the transverter, do you think that the IF in VHF is suitable also when I'm working in mode L/S where the Smode is done through a down converter 2400/144MHz? Sure, have a radio with a third band solve all the problems, probably IC910 newer or the glorius 790. I'm scratching the head to take a decision..
73 Mario IK1ZQJ
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----- Original Message ----- From: "IK1ZQJ Mario" mhz1575_69-aprs@yahoo.it To: "AMSAT-BB" amsat-bb@amsat.org Sent: Tuesday, August 25, 2009 9:16 PM Subject: [amsat-bb] Re: 23Cm Up converter
Hello Domenico I8CVS Coming back to the transverter, do you think that the IF in VHF is suitable also when I'm working in mode L/S where the Smode is done through a down converter 2400/144MHz? I'm scratching the head to take a decision..
73 Mario IK1ZQJ
Mario,
My downconverter is also a homebrewed 2400/144 MHz and I have used it for AO-40 where the analog downlink was 2401.225 - 2401.475 MHz and middle beacon was 2400.350 MHz so that only to tune the IF from 145.225 to 145.475 MHz was necessary.
In order do not interfere the receiving IF while transmitting I was using an IF from 144 to 145 MHz to drive my 23 cm transverter and get out from 1269.250 to 1269.500 MHz for the uplink into the L1 band or 1268.325 to 1268.575 MHz for the L2 band but obviously two diffent switchable XTAL's where needed into the transverter because time to time for the mode L/S the transponder uplink was switched from the L1 to the L2 band.
The above complication was justified at that time because AO-40 and the previously launched satellites OSCAR-10 and OSCAR-13 where the only HEO satellites covering the most part of day time for many and may hours every day.
As you can see any transverter with an IF falling into the amateur band has problem for satellite use full duplex and also for frequency agility in terms of changing quickly many operating frequencies in a quick time.
Transverters are good if you use the same frequency for RX/TX as for tropo or meteor scatter or EME but for satellite use where the operating mode novadays are many and they changes every week a transverter has many limitation.
For the above reason I strongly recommend to receive the S band using the actual downconverter and look for a second hand tranceiver for the rest of it.
Best 73" de
i8CVS Domenico
There is an even cheaper way if you like to build your own.
Paul, W1GHZ, has a set of transverter boards that can be used on 900MHz to 3.4GHz and are CHEAP to build if you like homebrewing.
I have the 900MHz and 1.2GHz boards and they have cost me about 150 dollars to procure parts and the boards so far not counting the parts that I have on hand in the junk box. You'll have to look at providing your own sequencing, enclosures, and connectors for these based on how you want to.
Pauls page for the transverters is: http://www.w1ghz.org/MBT/multiband.htm
Hope this is something that you might find useful and consider them.
James W8ISS ===== On Tue, 2009-08-25 at 17:46 +0200, i8cvs wrote:
Hi Mario, IK1ZQJ
I can suggest you to buy an SSB Electronics transverter model LT 24S output 1269 - 1271 MHz with an IF input 144-146 MHz, 10 watt output and a spare socket for a second XTAL to extend the band up or down the above centered BW
I have used the LT 24S to drive a pair of 7289 in a cavity amplifier when AO40 was alive and well
But be carefull.......because upconverters and transverters have their limitation in terms of frequency agility and probably it is more convenient for you to buy a second hand tranceiver with a 1200 MHz module installed as I did with a TS-790E at 850,00 Euro's and perfectly working.
73" de
i8CVS Domenico
----- Original Message ----- From: "IK1ZQJ Mario" mhz1575_69-aprs@yahoo.it To: AMSAT-BB@amsat.org Sent: Tuesday, August 25, 2009 11:57 AM Subject: [amsat-bb] 23Cm Up converter
Hello Folks, To work in uplink on the L band without a dedicated radio able to transmit
at 1269MHz an upconverter is needed, probably with if input is in 70cm.
Someone can suggest me how to use or build? I'm analyzing this way to save money instead of the station upgrade with a
new radio.
Thank you in advance.
Mario IK1ZQJ
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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