MDS≠MRS

JA2GXU
Posts: 6
Joined: Tue Jun 26, 2018 8:52 am

MDS≠MRS

Postby JA2GXU » Tue Jun 26, 2018 1:24 pm

Comparison Table for MRS, RMDR IMDDR etc.pdf
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MDS, RMDR and DRNS can't have any readable weak signal strength and published test date can't related to reception of minimum readable weak signals.
Assumed MRS or MRWS extreme useful for DX etc and MDS, RMDR and DRNS useless for DX etc.
Ham radio requires minimum readable signal strength such as called MRS or MRWS that can't related MDS, RMDR and DRNS.
MRS is related oscillators phase noise at 1kHz offset that ANAN series have -138dBc/Hz and other DS_SDR have -130dBc/Hz, -124dBc/Hz and so on.

I have heard from my ham radio operator that rank for readable weak signal strength depend on existing rigs as follows:
DS_SDR > TS-590 > FTdx5000

DS_SDR heard 100% readable weak signal.
TS-590 heard not complete reading about the same readable weak signal.
FTdx5000 heard nothing about the same readable weak signal.
Those results can't have any relations depend on existing MDS values such as
-133dBm, -137dBm, -142dBm or -123dBm, -129dBm, -128dBm(Pre amp OFF).
I assume MRS values according to oscillator's phase noise at 1kHz offset and depend on reciprocal mixing test, thus those are follows:
Above DS_SDR's clock phase noise have -124dBc/Hz at 1kHz offset and assumed MRS value is -121dBm. (-124+6+(-3)+0=-121)

TS-590 use double conversion, thus phase noise depend on 2DDS+DSP that total phase noise assumed -125dBc/Hz+6+(-3)+6=-116 and assumed MRS -116dBm.
(Good DDS's phase noise at 1kHz offset have almost -125dBc/Hz and due to clock phase noise)

FTdx5000 use triple conversion, thus phase noise depend on 3DDS+DSP that total phase noise assumed -125dBc/Hz+6+(-3)+9=-113 and assumed MRS -113dBm.

Above mentions MRS values and ranking as follows:
-121dBm<-116dBm<-113dBm ➞ DS_SDR < TS-590 < FTdx5000
(S1=-121dBm)

If using ANAN series then MRS value assumed -135dBm.

73
JA2GXU
Attachments
MRS & Phase noise of CVHD-950.pdf
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