Search found 662 matches

by glovisol
Thu Jul 25, 2019 7:22 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 41420

Re: Receive Antenna & Impedance "Matching"

Dear Bill, I indeed welcome your tractation and I am glad to have found a Forum member founding his Antenna Noise analysis on the notorious ITU publication 372. I really would like you to examine my one year old work and Antenna measurement cycle based on the mentioned publication here: https://www....
by glovisol
Thu Jul 25, 2019 6:20 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 41420

Re: Receive Antenna & Impedance "Matching"

CLARIFICATION ON SENSITIVITY PERFORMANCE COMPARISON RSP-1A VS. RSPduo & FOCUS ON NEGATIVE S/N 9. Looking at WSPR reception @ 7 MHz from the perspective of RSP Processors - an example 3-3. Noise meas. 7.2 MHz.jpg This post is an explanation of the calculation/detection mechanics involved in very wea...
by glovisol
Thu Jul 25, 2019 3:44 pm
Forum: General
Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
Replies: 19
Views: 9179

Re: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF

2.3. A DIGRESSION - NARROW BAND PRE-SELECTORS COMPUTER SIMULATION Uploaded below Figures 8 & 9 showing simulated performance @ 8MHz. Figure 8 (under top title) shows the following parameters: CF- Center Frequency: 8 MHz Qu - Unloaded Q: 320 QL- Loaded Q: 50 IL - Insertion loss: 1.5 db L - Coil indu...
by glovisol
Wed Jul 24, 2019 5:55 pm
Forum: General
Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
Replies: 19
Views: 9179

Re: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF

2.3. A DIGRESSION - NARROW BAND PRE-SELECTORS COMPUTER SIMULATION Uploaded below Figures 6 & 7 showing simulated performance @ 4 MHz. This is an overlap, having switched from the 2-4 MHz to the 4-8 MHz band. Figure 6 (under top title) shows the following parameters: CF- Center Frequency: 4 MHz Qu -...
by glovisol
Wed Jul 24, 2019 5:44 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 41420

Re: Receive Antenna & Impedance "Matching"

CLARIFICATION ON SENSITIVITY PERFORMANCE COMPARISON RSP-1A VS. RSPduo & FOCUS ON NEGATIVE S/N 8. SDR Noise Figure performance @ 7-8 MHz Finally we can look at the 40 m Band, because on this frequency vk7jj published most of his results for WSPR reception. The SDRplay published N.F. data here is as ...
by glovisol
Wed Jul 24, 2019 4:39 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 41420

Re: Receive Antenna & Impedance "Matching"

CLARIFICATION ON SENSITIVITY PERFORMANCE COMPARISON RSP-1A VS. RSPduo & FOCUS ON NEGATIVE S/N 7. SDR Noise Figure performance @ 80 KHz A legitimate objection that could be opposed to the data published and the quantities computed in the previous post is that the SDR Noise Figures taken from the pub...
by glovisol
Wed Jul 24, 2019 12:38 pm
Forum: General
Topic: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?
Replies: 7
Views: 3794

Re: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?

Dear Robert 11, if you read this thread: https://www.sdrplay.com/community/viewtopic.php?f=8&t=4493 and this: https://www.sdrplay.com/community/viewtopic.php?f=5&t=3352&hilit=sensityvity+measurement Of course you will need a lot of patience, as they are long threads, but then a clear picture will un...
by glovisol
Wed Jul 24, 2019 11:15 am
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 41420

Re: Receive Antenna & Impedance "Matching"

CLARIFICATION ON SENSITIVITY PERFORMANCE COMPARISON RSP-1A VS. RSPduo & FOCUS ON NEGATIVE S/N I believe the previous two posts have introduced confusion on several important questions and with this post I wish to clarify some ESSENTIAL concepts. 1. RSP-1A and RSPduo Sensitivity & Noise Figure speci...
by glovisol
Wed Jul 24, 2019 5:50 am
Forum: General
Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
Replies: 19
Views: 9179

Re: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF

2.3. A DIGRESSION - NARROW BAND PRE-SELECTORS COMPUTER SIMULATION Uploaded below Figures 4 & 5 showing simulated performance @ 4 MHz. Figure 4 (under top title) shows the following parameters: CF- Center Frequency: 4 MHz Qu - Unloaded Q: 350 QL- Loaded Q: 80 IL - Insertion loss: 2.3 db L - Coil ind...
by glovisol
Tue Jul 23, 2019 7:05 pm
Forum: General
Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
Replies: 19
Views: 9179

Re: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF

2.3. A DIGRESSION - NARROW BAND PRE-SELECTORS COMPUTER SIMULATION In general a narrow band pre-selector consists of a tuneable single tuned bandpass L/C circuit placed between antenna output and receiver input. The inductor is wound on a Powdered Iron toroid core and the capacitor is an air variabl...