S3 With Downconverter option
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Wily
Hello!
Can anyone tell me what the sensitivity of the FMD-S3 with a downconverter is above 110MHz?
I connected three receivers with the splitter: FDM-S3, R&S EB200 and RTL-SDR.
I found that R&S EB200 and RTL-SDR are more sensitive than FDM-S3.
I compared the received signals of Avia (129 MHz) and APCO-25 (423 MHz).
With the R&S EB200 and RTL-SDR signals can be heard loud and clear.
With the FDM-S3 with Preamp 2 ON, I can see the signal on the waterfall, but the audio is weak and hard to read.
Best regards!
Vilnis |
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Mike Black
Once the signal gets to the rig it doesn't care where it came from.
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I would suspect a problem in the down conversion. Mike W9MDB On Saturday, March 18, 2023 at 06:45:43 AM CDT, Wily <wily@...> wrote:
Hello! Can anyone tell me what the sensitivity of the FMD-S3 with a downconverter is above 110MHz? I connected three receivers with the splitter: FDM-S3, R&S EB200 and RTL-SDR. I found that R&S EB200 and RTL-SDR are more sensitive than FDM-S3. I compared the received signals of Avia (129 MHz) and APCO-25 (423 MHz). With the R&S EB200 and RTL-SDR signals can be heard loud and clear. With the FDM-S3 with Preamp 2 ON, I can see the signal on the waterfall, but the audio is weak and hard to read. Best regards! Vilnis |
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Ivan Dias
Vilnis,
Open a support ticket. My unit is more sensitive than the Malahit DSP2 (original russian version), Airspy R2 clone and Whistler TRX-1. Ivan |
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Wily
Hi, Ivan!
Thanks for the reply!
First of all, I would like to know some numbers in dBm, mkV or something similar.
All Technical Specifications are given for 91.1MHz, i.e. without downconverter.
Up to 108MHz everything is very good.
From 108MHz to 4.25GHz, I think the sensitivity of my FDM-S3 is low.
Best regards,
Vilnis
----- Original Message -----
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This is what I got from ELAD
Everett N4CY
ELAD FDM-S3 Data Noise floor @144MHz : ~ -137dBm, ~ -152dBm with preamp In a message dated 3/23/2023 10:22:24 AM Central Standard Time, wily@... writes:
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Wily
Wow, wonderful!
Some are lucky, the dealer told me that there is no such data.
Thank you!
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Conrad, PA5Y
This data was given on this group some time ago. There is no mention of bandwidth but I expect that the MDS is shown in 500Hz BW as is normally the case. This means that the noise figures as indicated in the table below.
Regards
Conrad PA5Y
From: EladSDR@groups.io <EladSDR@groups.io>
On Behalf Of Everett N4CY via groups.io
Sent: 23 March 2023 16:27 To: EladSDR@groups.io Subject: Re: [EladSDR] S3 With Downconverter option
This is what I got from ELAD
Everett N4CY ELAD FDM-S3 Data Noise floor @144MHz : ~ -137dBm, ~ -152dBm with preamp
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T.W.H. Fockens
Measured in what bandwidth?
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These numbers are saying nothing without naming the bandwidth! Koos PA0KDF On 23 Mar, Everett N4CY via groups.io <everettsharp@...> wrote:
This is what I got from ELAD Noise floor @144MHz : ~ -137dBm, ~ -152dBm with preamp In a message dated 3/23/2023 10:22:24 AM Central Standard Time, wily@... writes: Open a support ticket. My unit is more sensitive than the Malahit DSP2 (original russian version), Airspy R2 clone and Whistler TRX-1. Ivan --
Ir. T.W.H. Fockens Kieftweg 1 7165BR Rietmolen "Geweld kan alleen worden toegedekt met een leugen, en de leugen kan alleen worden volgehouden met geweld." (Aleksandr Solzjenitsyn) |
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Mike Black
ARRL published the standard in 1975....500Hz width....so one would like to assume they used that standard. Rob's testing of the ELAD DUO showed -132dBm but I don'/t see the frequency being measure -- I'll have to ask Rob. Mike W9MDB
On Thursday, March 23, 2023 at 11:50:54 AM CDT, T.W.H. Fockens <koos@...> wrote:
Measured in what bandwidth? These numbers are saying nothing without naming the bandwidth! Koos PA0KDF On 23 Mar, Everett N4CY via groups.io <everettsharp@...> wrote: > This is what I got from ELAD > Everett N4CY > ELAD FDM-S3 Data > Noise floor @144MHz : ~ -137dBm, ~ -152dBm with preamp > MDS @144MHz : ~ -127dBm, ~ -142dBm with preamp > Clip @144MHz : ~ -9dBm, ~ -30dBm with preamp > MDS @435MHz : ~ -126dBm, ~ -141dBm with preamp > MDS @810MHz : ~ -124dBm, ~ -143dBm with preamp > MDS @1240MHz : ~ -125dBm, ~ -139dBm with preamp > MDS @2320MHz : ~ -122dBm, ~ -131dBm with preamp > MDS @3010MHz : ~ -120dBm, ~ -128dBm with preamp > MDS @4010MHz : ~ -113dBm, ~ -116dBm with preamp > In a message dated 3/23/2023 10:22:24 AM Central Standard Time, wily@... writes: > Hi, Ivan!Thanks for the reply!First of all, I would like to know some numbers in dBm, mkV or something similar. All Technical Specifications are given for 91.1MHz, i.e. without downconverter. Up to 108MHz everything is very good. From 108MHz to 4.25GHz, I think the sensitivity of my FDM-S3 is low.Best regards,Vilnis ----- Original Message ----- > From: Ivan Dias via groups.io <ivan_sorocaba@...>Reply-To: <EladSDR@groups.io>To: <EladSDR@groups.io>Sent: 23.03.2023 14:46:59Subject: Re: [EladSDR] S3 With Downconverter optionVilnis, > Open a support ticket. My unit is more sensitive than the Malahit DSP2 (original russian version), Airspy R2 clone and Whistler TRX-1. > Ivan > -- Ir. T.W.H. Fockens Kieftweg 1 7165BR Rietmolen "Geweld kan alleen worden toegedekt met een leugen, en de leugen kan alleen worden volgehouden met geweld." (Aleksandr Solzjenitsyn) |
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T.W.H. Fockens
Nobody knows wether ELAD did the measurement according the ARRL
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standard. It is absolute necessary to mention it together with the numbers. Koos PA0KDf On 23 Mar, Michael Black via groups.io <mdblack98@...> wrote:
ARRL published the standard in 1975....500Hz width....so one would like to assume they used that standard. Rob's testing of the ELAD DUO showed -132dBm but I don'/t see the frequency being measure -- I'll have to ask Rob. Mike W9MDB On Thursday, March 23, 2023 at 11:50:54 AM CDT, T.W.H. Fockens <koos@...> wrote: Koos PA0KDF On 23 Mar, Everett N4CY via groups.io <everettsharp@...> wrote:This is what I got from ELAD Noise floor @144MHz : ~ -137dBm, ~ -152dBm with preamp In a message dated 3/23/2023 10:22:24 AM Central Standard Time, wily@... writes: Open a support ticket. My unit is more sensitive than the Malahit DSP2 (original russian version), Airspy R2 clone and Whistler TRX-1. Ivan -- --
Ir. T.W.H. Fockens Kieftweg 1 7165BR Rietmolen "Geweld kan alleen worden toegedekt met een leugen, en de leugen kan alleen worden volgehouden met geweld." (Aleksandr Solzjenitsyn) |
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Conrad, PA5Y
I did say that ‘I expect that the MDS is shown in 500Hz BW as is normally the case! This is what Elad normally use so I very much doubt they changed this trend. Better to actually read the post that try to look clever.
73
Conrad PA5Y
From: EladSDR@groups.io <EladSDR@groups.io>
On Behalf Of Conrad, PA5Y via groups.io
Sent: Thursday, March 23, 2023 5:27 PM To: EladSDR@groups.io Subject: Re: [EladSDR] S3 With Downconverter option
This data was given on this group some time ago. There is no mention of bandwidth but I expect that the MDS is shown in 500Hz BW as is normally the case. This means that the noise figures as indicated in the table below.
Regards
Conrad PA5Y
From:
EladSDR@groups.io <EladSDR@groups.io>
On Behalf Of Everett N4CY via groups.io
This is what I got from ELAD
Everett N4CY ELAD FDM-S3 Data Noise floor @144MHz : ~ -137dBm, ~ -152dBm with preamp
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