WTB: LNA4ALL
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Conrad, PA5Y
I want an LNA for Band II to go with my FDM-S3. I have a good BPF. The LNA4ALL is just a PGA103+ that has a bias T facility so it will do nicely. Has anyone got a spare one for sale or something similar?
73 Conrad PA5Y
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Hi,
toggle quoted messageShow quoted text
I do have one I don't use but the S3 really shouldn't need a pre-amp, are you 101% sure you need this? Simon Brown https://www.sdr-radio.com
-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Conrad, PA5Y Sent: 28 April 2022 13:54 To: main@SDR-Radio.groups.io Subject: [SDR-Radio] WTB: LNA4ALL I want an LNA for Band II to go with my FDM-S3. I have a good BPF. The LNA4ALL is just a PGA103+ that has a bias T facility so it will do nicely. Has anyone got a spare one for sale or something similar? 73 Conrad PA5Y -- - + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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Conrad, PA5Y
Absolutely, the S3 has a noise figure of 9dB with the preamp on, This is really not good enough, I have determined that I would like 4dB or so here in my quiet location. So, to achieve this I will use an external LNA. So not 101% but 100% 😉
Dynamic range is still good enough with S3 preamp off.
73
Conrad PA5Y
-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown via groups.io Sent: 28 April 2022 15:57 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] WTB: LNA4ALL
Hi,
I do have one I don't use but the S3 really shouldn't need a pre-amp, are you 101% sure you need this?
Simon Brown
-----Original Message----- From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Conrad, PA5Y Sent: 28 April 2022 13:54 Subject: [SDR-Radio] WTB: LNA4ALL
I want an LNA for Band II to go with my FDM-S3. I have a good BPF. The LNA4ALL is just a PGA103+ that has a bias T facility so it will do nicely. Has anyone got a spare one for sale or something similar?
73
Conrad PA5Y
-- - + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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toggle quoted messageShow quoted text
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Conrad, PA5Y
Sent: 28 April 2022 15:15 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] WTB: LNA4ALL
Absolutely, the S3 has a noise figure of 9dB with the preamp on, This is really not good enough, I have determined that I would like 4dB or so here in my quiet location. So, to achieve this I will use an external LNA. So not 101% but 100% 😉
Dynamic range is still good enough with S3 preamp off.
73
Conrad PA5Y
-----Original Message-----
Hi,
I do have one I don't use but the S3 really shouldn't need a pre-amp, are you 101% sure you need this?
Simon Brown
-----Original Message----- From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Conrad, PA5Y Sent: 28 April 2022 13:54 Subject: [SDR-Radio] WTB: LNA4ALL
I want an LNA for Band II to go with my FDM-S3. I have a good BPF. The LNA4ALL is just a PGA103+ that has a bias T facility so it will do nicely. Has anyone got a spare one for sale or something similar?
73
Conrad PA5Y
-- - + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
-- - + - + -
Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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Conrad, PA5Y
I don’t need to measure it, as it is specified in the manual by Elad. See page 23.
The Noise floor at 500Hz BW at 91.1MHz is -138dBm with the Preamp on and NR off.
Convert to dBm/Hz
So Elad say 9dB, I believe them, not so amazing and typical. When the band is open then 9dB is adequate, but the weak stuff needs a little better.
73
Conrad PA5Y
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Simon Brown via groups.io
9dB, really? Have you measured this?
Seems amazing…
Simon Brown
From:
main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Conrad, PA5Y
Absolutely, the S3 has a noise figure of 9dB with the preamp on, This is really not good enough, I have determined that I would like 4dB or so here in my quiet location. So, to achieve this I will use an external LNA. So not 101% but 100% 😉
Dynamic range is still good enough with S3 preamp off.
73
Conrad PA5Y
-----Original Message-----
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Simon Brown via groups.io Sent: 28 April 2022 15:57 To: main@SDR-Radio.groups.io Subject: Re: [SDR-Radio] WTB: LNA4ALL
Hi,
I do have one I don't use but the S3 really shouldn't need a pre-amp, are you 101% sure you need this?
Simon Brown
-----Original Message----- From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io> On Behalf Of Conrad, PA5Y Sent: 28 April 2022 13:54 Subject: [SDR-Radio] WTB: LNA4ALL
I want an LNA for Band II to go with my FDM-S3. I have a good BPF. The LNA4ALL is just a PGA103+ that has a bias T facility so it will do nicely. Has anyone got a spare one for sale or something similar?
73
Conrad PA5Y
-- - + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
- + - + - Please use https://forum.sdr-radio.com:4499/ when posting questions or problems.
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This one:
https://www.passion-radio.com/sdr-accessory/lna-opa-805.html ... is a good replacement for the LNA4ALL.
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Conrad, PA5Y
Hi Dirk, I contacted Vincent already but no reply yet.
Conrad
From: main@SDR-Radio.groups.io <main@SDR-Radio.groups.io>
On Behalf Of Dirk via groups.io
This one:
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marco.giacomini@...
Take a look:
https://www.sv1afn.com/en/product-category-5/pga-103-lna-20-mhz-3-ghz-ultra-low-noise-preamp-for-sdr-or-older-lnas.html
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Siegfried Jackstien
And with bigger coupling caps and decoupling coils the 103 can be used down to long wave :-) Dg9bfc sigi Am 30.04.2022 17:46 schrieb marco.giacomini@...:
Take a look:
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