Re: [amsat-bb] Ettus B210
=======snip I looked into the Toshiba Module solution mentioned, and it is a pretty decent solution, but my problem with it was filtering. Those modules are great but have pretty bad third harmonic and spur rejection. This means that final stage filtering will be required to stay within FCC limits (I think -60 dBc is the requirement, can't remember off the top of my head). The W6PQL reference is fantastic and is closer to a good solution because he has the filtering problem solved in his designs (you may have to get the filter board separate for the 70cm design, I think he includes a filter in the 80W 2m Amp design). For the budget conscious, this is the path I would recommend. I would probably look into using the Toshiba modules with lower output power (single digit Watts) as a driver for something like a Mirage Amp (that I think has the final stage filtering built in). ====snip
The W6PQL board is wide-band and one only needs to use proper value bypass capacitors and wind coils for 435-MHz. Not saying that is trivial but that is all that would be needed for filtering using that pc board. In the past others made generic pc boards for using the Toshiba modules. This is going to require some engineering to accomplish or you can spend big bucks and go the Kuhne Engineering route.
I assume anyone using the Ettus B210 is willing to do that.
73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa@gmail.com
Was looking with a chary eye at the Mitsubishi boards available on the net. Pulled the trigger on 4 boards and 2 amp controllers from 'pql. Spent many, many nights browsing his homepages. Need to decide which part I should mount.
On Mon, Jan 25, 2016 at 2:56 PM, Edward R Cole kl7uw@acsalaska.net wrote:
=======snip I looked into the Toshiba Module solution mentioned, and it is a pretty decent solution, but my problem with it was filtering. Those modules are great but have pretty bad third harmonic and spur rejection. This means that final stage filtering will be required to stay within FCC limits (I think -60 dBc is the requirement, can't remember off the top of my head). The W6PQL reference is fantastic and is closer to a good solution because he has the filtering problem solved in his designs (you may have to get the filter board separate for the 70cm design, I think he includes a filter in the 80W 2m Amp design). For the budget conscious, this is the path I would recommend. I would probably look into using the Toshiba modules with lower output power (single digit Watts) as a driver for something like a Mirage Amp (that I think has the final stage filtering built in). ====snip
The W6PQL board is wide-band and one only needs to use proper value bypass capacitors and wind coils for 435-MHz. Not saying that is trivial but that is all that would be needed for filtering using that pc board. In the past others made generic pc boards for using the Toshiba modules. This is going to require some engineering to accomplish or you can spend big bucks and go the Kuhne Engineering route.
I assume anyone using the Ettus B210 is willing to do that.
73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa@gmail.com
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Thanks to everybody...... I begin studying all this good information Sorry for my bad english... 73 de Juan....EB2FVT El 25/01/2016 20:56, "Edward R Cole" kl7uw@acsalaska.net escribió:
=======snip I looked into the Toshiba Module solution mentioned, and it is a pretty decent solution, but my problem with it was filtering. Those modules are great but have pretty bad third harmonic and spur rejection. This means that final stage filtering will be required to stay within FCC limits (I think -60 dBc is the requirement, can't remember off the top of my head). The W6PQL reference is fantastic and is closer to a good solution because he has the filtering problem solved in his designs (you may have to get the filter board separate for the 70cm design, I think he includes a filter in the 80W 2m Amp design). For the budget conscious, this is the path I would recommend. I would probably look into using the Toshiba modules with lower output power (single digit Watts) as a driver for something like a Mirage Amp (that I think has the final stage filtering built in). ====snip
The W6PQL board is wide-band and one only needs to use proper value bypass capacitors and wind coils for 435-MHz. Not saying that is trivial but that is all that would be needed for filtering using that pc board. In the past others made generic pc boards for using the Toshiba modules. This is going to require some engineering to accomplish or you can spend big bucks and go the Kuhne Engineering route.
I assume anyone using the Ettus B210 is willing to do that.
73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa@gmail.com
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
What do you think about these amps?
http://www.rfbayinc.com/subcategory_product.php?cPath=58
The HPA-155 and HPA 480
73 de Juan EB2FVT
El lun, 25-01-2016 a las 10:56 -0900, Edward R Cole escribió:
=======snip I looked into the Toshiba Module solution mentioned, and it is a pretty decent solution, but my problem with it was filtering. Those modules are great but have pretty bad third harmonic and spur rejection. This means that final stage filtering will be required to stay within FCC limits (I think -60 dBc is the requirement, can't remember off the top of my head). The W6PQL reference is fantastic and is closer to a good solution because he has the filtering problem solved in his designs (you may have to get the filter board separate for the 70cm design, I think he includes a filter in the 80W 2m Amp design). For the budget conscious, this is the path I would recommend. I would probably look into using the Toshiba modules with lower output power (single digit Watts) as a driver for something like a Mirage Amp (that I think has the final stage filtering built in). ====snip
The W6PQL board is wide-band and one only needs to use proper value bypass capacitors and wind coils for 435-MHz. Not saying that is trivial but that is all that would be needed for filtering using that pc board. In the past others made generic pc boards for using the Toshiba modules. This is going to require some engineering to accomplish or you can spend big bucks and go the Kuhne Engineering route.
I assume anyone using the Ettus B210 is willing to do that.
73, Ed - KL7UW http://www.kl7uw.com "Kits made by KL7UW" Dubus Mag business: dubususa@gmail.com
Sent via AMSAT-BB@amsat.org. AMSAT-NA makes this open forum available to all interested persons worldwide without requiring membership. Opinions expressed are solely those of the author, and do not reflect the official views of AMSAT-NA. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
participants (4)
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Edward R Cole -
Juan Jose Sanchez Denis -
Juan Sanchez
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Norm n3ykf