Search found 6 matches

by JA2GXU
Sun Sep 02, 2018 8:18 am
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: Contradiction of ARRL's RMDR
Replies: 2
Views: 1280

Re: Contradiction of ARRL's RMDR

Are you read my contribution in this forums "Reciprocal Mixing and useless any RMDR".
This my contribution includes "Contraction of ARRL's RMDR".

73
JA2GXU
by JA2GXU
Mon Aug 27, 2018 5:37 am
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: GPSDO Tutorial?
Replies: 78
Views: 27286

Re: GPSDO Tutorial?

Phase noise problem for use general kind of GPSDO. Degrading phase noise occurs desired weak signal buried in increased noise floor I recommend don't use general kind of GPSDO due to degrading phase noise. Improved GPSDO includes VC_OCXO and PLL have more than 100 seconds loop time constant, thus do...
by JA2GXU
Mon Aug 27, 2018 1:09 am
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: Rreciprocal Mixing and useless any RMDR
Replies: 0
Views: 1982

Rreciprocal Mixing and useless any RMDR

Basic theory and concept for reciprocal mixing and MRS for HF receivers and transceivers Introduction My friend of Ham radio operator said receiving desired weak signal readability ranking are DS_SDR > TS-590 > FTdx5000 at 20m band, however FTdx5000 can't detect and read to the same desired readable...
by JA2GXU
Mon Aug 27, 2018 12:32 am
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: Contradiction of ARRL's RMDR
Replies: 2
Views: 1280

Contradiction of ARRL's RMDR

My friend of Ham radio operator said receiving desired weak signal readability ranking are DS_SDR > TS-590 > FTdx5000 at 20m band, however FTdx5000 can't detect and read to the same desired readable weak signal (DS_SDR is direct sampling SDR). Those are DS_SDR heard 100% desired readable weak signal...
by JA2GXU
Wed Jun 27, 2018 1:16 pm
Forum: Apache Labs News
Topic: Rob Sherwood, NCOB's presentation at Contest University 2018
Replies: 2
Views: 1852

Re: Rob Sherwood, NCOB's presentation at Contest University 2018

Unfortunately this presentation don't have any minimum readable weak signal strength such as assumed MRS. And only have MDS that don't mean any MRS. And also RMDR and DRNS can't meet actual reciprocal mixing test. I posted to ARRL due to RMDR and actual reciprocal mixing test with test procedure and...
by JA2GXU
Tue Jun 26, 2018 1:24 pm
Forum: Everything Else: Antennas, Relays, Switches, Power, Grounding, Cooling, etc.
Topic: MDS≠MRS
Replies: 0
Views: 1323

MDS≠MRS

Comparison Table for MRS, RMDR IMDDR etc.pdf 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 requir...

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