Search found 662 matches
- Thu Jul 25, 2019 7:22 pm
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498209
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....
- Thu Jul 25, 2019 6:20 pm
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498209
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...
- Thu Jul 25, 2019 3:44 pm
- Forum: General
- Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
- Replies: 19
- Views: 75878
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...
- Wed Jul 24, 2019 5:55 pm
- Forum: General
- Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
- Replies: 19
- Views: 75878
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 -...
- Wed Jul 24, 2019 5:44 pm
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498209
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 ...
- Wed Jul 24, 2019 4:39 pm
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498209
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...
- Wed Jul 24, 2019 12:38 pm
- Forum: General
- Topic: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?
- Replies: 7
- Views: 31019
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...
- Wed Jul 24, 2019 11:15 am
- Forum: SDR Antennas
- Topic: Receive Antenna & Impedance "Matching"
- Replies: 114
- Views: 498209
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...
- Wed Jul 24, 2019 5:50 am
- Forum: General
- Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
- Replies: 19
- Views: 75878
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...
- Tue Jul 23, 2019 7:05 pm
- Forum: General
- Topic: BUILDING SELECTIVITY PROTECTION INTO THE RSP FRONT END IN LF/HF
- Replies: 19
- Views: 75878
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...