[K3S] mW TX for WSPR
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I'm trying to fiddle the TX power on my K3S using WSJT-X WSPR 1.7 on a 43ft Vertical to match the 200 mW output of a WSPRlite over a random wire dipole antenna, using the DXplorer.net simultaneous RX measurement system https://tinyurl.com/mthms72 . Is TX wattage continuous with rotation of the PWR knob? It has 0.1W decrements and I seem to find equal performance between 0.6 and 0.7W on the K3S and was curious if halfway between 0.6 and 0.7W as I rotate the knob is 0.65W? I can imagine precision of TX power isn't accurate to more than +/1 0.1W but thought I'd inquire.
Bret/N4SRN |
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Hi Bret,
When using the DXplorer.net simultaneous receive measurement system, its best if you have the capability to start your testing by simultaneously transmitting through a Magic-T combiner into a single antenna. In less than 30 minutes you'll have enough data from DXplorer.net to calibrate out any power output difference between the two transmitters. After you've completed the calibration you're ready to connect each WSPR transmitter to the antennas under test. 73 Frank W3LPL ----- Original Message ----- From: "MaverickNH" <[hidden email]> To: [hidden email] Sent: Tuesday, May 16, 2017 6:37:31 PM Subject: [Elecraft] [K3S] mW TX for WSPR I'm trying to fiddle the TX power on my K3S using WSJT-X WSPR 1.7 on a 43ft Vertical to match the 200 mW output of a WSPRlite over a random wire dipole antenna, using the DXplorer.net simultaneous RX measurement system https://tinyurl.com/mthms72 . Is TX wattage continuous with rotation of the PWR knob? It has 0.1W decrements and I seem to find equal performance between 0.6 and 0.7W on the K3S and was curious if halfway between 0.6 and 0.7W as I rotate the knob is 0.65W? I can imagine precision of TX power isn't accurate to more than +/1 0.1W but thought I'd inquire. Bret/N4SRN -- View this message in context: http://elecraft.365791.n2.nabble.com/K3S-mW-TX-for-WSPR-tp7630731.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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Hi Frank,
I think I see what you are suggesting - matching the power transmitted by each transceiver over a common antenna to assure I'm feeding two different antennas with the same TX power? I'm finding a Magic-T RX Splitter/Combiner https://www.dxengineering.com/parts/svp-sv-rsc-50 Can I use this to transmit as well? I'd like to give your plan a try. I was looking at the problem from a different perspective perhaps. Since the WSPRlite is a low output TXer (variable over 16 dB range up to 200mW, so I think that means 5mW to 200mW) I was looking to set that at 200mW on my random dipole antenna (two random wires, one E-W and the other W-E, joined by a 4:1 balun) and try to figure what power on my nearby 43ft Vertical gave the same profile on DXplorer.net. I think comparing a dipole to a vertical might be a interesting task, as it appears one is more "efficient" at night and the other during the day. The DX10 lines seem to invert at dawn and dusk on 40m. Two completely different antennas types cannot be equivalent a priori , I suppose! BRET/N4SRN ----- Original Message ----- From: [hidden email] To: [hidden email] Sent: Tuesday, May 16, 2017 5:40:31 PM Subject: Re: [Elecraft] [K3S] mW TX for WSPR Hi Bret, When using the DXplorer.net simultaneous receive measurement system, its best if you have the capability to start your testing by simultaneously transmitting through a Magic-T combiner into a single antenna. In less than 30 minutes you'll have enough data from DXplorer.net to calibrate out any power output difference between the two transmitters. After you've completed the calibration you're ready to connect each WSPR transmitter to the antennas under test. 73 Frank W3LPL ----- Original Message ----- From: "MaverickNH" <[hidden email]> To: [hidden email] Sent: Tuesday, May 16, 2017 6:37:31 PM Subject: [Elecraft] [K3S] mW TX for WSPR I'm trying to fiddle the TX power on my K3S using WSJT-X WSPR 1.7 on a 43ft Vertical to match the 200 mW output of a WSPRlite over a random wire dipole antenna, using the DXplorer.net simultaneous RX measurement system https://tinyurl.com/mthms72 . Is TX wattage continuous with rotation of the PWR knob? It has 0.1W decrements and I seem to find equal performance between 0.6 and 0.7W on the K3S and was curious if halfway between 0.6 and 0.7W as I rotate the knob is 0.65W? I can imagine precision of TX power isn't accurate to more than +/1 0.1W but thought I'd inquire. Bret/N4SRN -- View this message in context: http://elecraft.365791.n2.nabble.com/K3S-mW-TX-for-WSPR-tp7630731.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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The DX Engineering Magic-T combiner should work fine.
Just be sure you don't too much power into it! Much less than one watt. The dual receive feature of DXplorer should do the trick for you. Same polarization antennas produce almost immediate good performance evaluation results. Evaluating the performance of antennas with different polarizations might take some effort. 73 Frank W3LPL ----- Original Message ----- From: "Charles" <[hidden email]> To: [hidden email] Cc: [hidden email] Sent: Tuesday, May 16, 2017 10:40:09 PM Subject: Re: [Elecraft] [K3S] mW TX for WSPR Hi Frank, I think I see what you are suggesting - matching the power transmitted by each transceiver over a common antenna to assure I'm feeding two different antennas with the same TX power? I'm finding a Magic-T RX Splitter/Combiner https://www.dxengineering.com/parts/svp-sv-rsc-50 Can I use this to transmit as well? I'd like to give your plan a try. I was looking at the problem from a different perspective perhaps. Since the WSPRlite is a low output TXer (variable over 16 dB range up to 200mW, so I think that means 5mW to 200mW) I was looking to set that at 200mW on my random dipole antenna (two random wires, one E-W and the other W-E, joined by a 4:1 balun) and try to figure what power on my nearby 43ft Vertical gave the same profile on DXplorer.net. I think comparing a dipole to a vertical might be a interesting task, as it appears one is more "efficient" at night and the other during the day. The DX10 lines seem to invert at dawn and dusk on 40m. Two completely different antennas types cannot be equivalent a priori , I suppose! BRET/N4SRN ----- Original Message ----- From: [hidden email] To: [hidden email] Sent: Tuesday, May 16, 2017 5:40:31 PM Subject: Re: [Elecraft] [K3S] mW TX for WSPR Hi Bret, When using the DXplorer.net simultaneous receive measurement system, its best if you have the capability to start your testing by simultaneously transmitting through a Magic-T combiner into a single antenna. In less than 30 minutes you'll have enough data from DXplorer.net to calibrate out any power output difference between the two transmitters. After you've completed the calibration you're ready to connect each WSPR transmitter to the antennas under test. 73 Frank W3LPL ----- Original Message ----- From: "MaverickNH" <[hidden email]> To: [hidden email] Sent: Tuesday, May 16, 2017 6:37:31 PM Subject: [Elecraft] [K3S] mW TX for WSPR I'm trying to fiddle the TX power on my K3S using WSJT-X WSPR 1.7 on a 43ft Vertical to match the 200 mW output of a WSPRlite over a random wire dipole antenna, using the DXplorer.net simultaneous RX measurement system https://tinyurl.com/mthms72 . Is TX wattage continuous with rotation of the PWR knob? It has 0.1W decrements and I seem to find equal performance between 0.6 and 0.7W on the K3S and was curious if halfway between 0.6 and 0.7W as I rotate the knob is 0.65W? I can imagine precision of TX power isn't accurate to more than +/1 0.1W but thought I'd inquire. Bret/N4SRN -- View this message in context: http://elecraft.365791.n2.nabble.com/K3S-mW-TX-for-WSPR-tp7630731.html Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
Re: [K3S] mW TX for WSPR
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I use a Mini-Circuits ZSC-2-2+ as a splitter for my RX antenna
Per it's specs it looks to be rated at 1 watt From: "[hidden email]" <[hidden email]> To: [hidden email] Sent: Wednesday, May 17, 2017 12:50 AM Subject: Re: [Elecraft] [K3S] mW TX for WSPR The DX Engineering Magic-T combiner should work fine. Just be sure you don't too much power into it! Much less than one watt. The dual receive feature of DXplorer should do the trick for you. Same polarization antennas produce almost immediate good performance evaluation results. Evaluating the performance of antennas with different polarizations might take some effort. 73 Frank W3LPL ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html Message delivered to [hidden email] |
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