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Bernieg4hwa
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
On 29 Jan 2023, at 10:21, Bernieg4hwa <bernieg4hwa@...> wrote:
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Bernieg4hwa
Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA
If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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I was never successful at doing that, so resorted to either relay or Mosfet series supply switch.
Sam Sent tomorrow from my iPad 10
On 29 Jan 2023, at 13:18, Bernieg4hwa <bernieg4hwa@...> wrote:
Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Bernieg4hwa
Thanks Sam
What are your thoughts for a long term solution , relay or mosfet switch ,on a permanent masthead installation ?
It's on a tilt over tennamast , but once it goes up it stays up , more concerned with reliability in this situation.
Bernie G4HWA
I was never successful at doing that, so resorted to either relay or Mosfet series supply switch.
Sam Sent tomorrow from my iPad 10 Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Bernieg4hwa
Meant to ask you Sam what difference did the resistor make ?
At the moment i'm getting something like 14 watts out .
Bernie
If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Very little difference. In the original set up there was a pot to ground. It maybe that ground will reduce the gain. I just wanted max gain. Unlikely it will turn off, I.E. kill any noise from the amplifier. Sam Sent tomorrow from my time machine
On 29 Jan 2023, at 13:54, Bernieg4hwa <bernieg4hwa@...> wrote:
Meant to ask you Sam what difference did the resistor make ?
At the moment i'm getting something like 14 watts out .
Bernie If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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I now use a mosfet switch. Relay would be OK since the operation is unlikely to be break in….. Sam Sent tomorrow from my time machine
On 29 Jan 2023, at 13:47, Bernieg4hwa <bernieg4hwa@...> wrote:
Thanks Sam
What are your thoughts for a long term solution , relay or mosfet switch ,on a permanent masthead installation ?
It's on a tilt over tennamast , but once it goes up it stays up , more concerned with reliability in this situation.
Bernie G4HWA I was never successful at doing that, so resorted to either relay or Mosfet series supply switch.
Sam Sent tomorrow from my iPad 10 Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Andy G4JNT
Out of curiosity, What is the marked, or original design frequency of that module?
I now use a mosfet switch. Relay would be OK since the operation is unlikely to be break in….. Sam Sent tomorrow from my time machine
Thanks Sam
What are your thoughts for a long term solution , relay or mosfet switch ,on a permanent masthead installation ?
It's on a tilt over tennamast , but once it goes up it stays up , more concerned with reliability in this situation.
Bernie G4HWA I was never successful at doing that, so resorted to either relay or Mosfet series supply switch.
Sam Sent tomorrow from my iPad 10 Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Mine is upper 6, but works fine down at 5.7GHz. Much lower and the power/gain drops rapidly. I combine two for 25W out on EME. Sam Sent tomorrow from my time machine
On 29 Jan 2023, at 15:30, Andy G4JNT <andy.g4jnt@...> wrote:
Out of curiosity, What is the marked, or original design frequency of that module?
I now use a mosfet switch. Relay would be OK since the operation is unlikely to be break in….. Sam Sent tomorrow from my time machine
Thanks Sam
What are your thoughts for a long term solution , relay or mosfet switch ,on a permanent masthead installation ?
It's on a tilt over tennamast , but once it goes up it stays up , more concerned with reliability in this situation.
Bernie G4HWA I was never successful at doing that, so resorted to either relay or Mosfet series supply switch.
Sam Sent tomorrow from my iPad 10 Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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Andy G4JNT
AH, so designed for C-band Sat uplink. Matra Marconi only peripherally dabbled in ground stations I thought, and the company under that name only lasted a few years (I worked for them for the first three) before becoming Astrium. SO was a bit surprised to hear of a C-band uplink PA with their name. Could have been from the Matra heritage, I guess.
Mine is upper 6, but works fine down at 5.7GHz. Much lower and the power/gain drops rapidly. I combine two for 25W out on EME. Sam Sent tomorrow from my time machine
Out of curiosity, What is the marked, or original design frequency of that module?
I now use a mosfet switch. Relay would be OK since the operation is unlikely to be break in….. Sam Sent tomorrow from my time machine
Thanks Sam
What are your thoughts for a long term solution , relay or mosfet switch ,on a permanent masthead installation ?
It's on a tilt over tennamast , but once it goes up it stays up , more concerned with reliability in this situation.
Bernie G4HWA I was never successful at doing that, so resorted to either relay or Mosfet series supply switch.
Sam Sent tomorrow from my iPad 10 Hi Sam
Thanks for the info , I was hoping I could use it to bias Amp off during receive , rather than apply main 12 volts each time , hence the question .
73
Bernie G4HWA If it is the sort I use, then just a 10K resistor to ground is all that is required for full gain. 73 de Sam, G4DDK Sent tomorrow from my time machine
Hi guys
Can anyone help with info on :-
matra marconi space sspa type fta/c20e/2624/2624/2
It works ok on 6cms but trying to find out what voltage I need to apply to gain adjust connector .
Not much response on google search.
73
Bernie G4HWA
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