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QMX+ Boost Power Out on 20M?

Greg McCain All Messages By This Member #127598 Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Ian G4GIR All Messages By This Member #127606 开云体育 Hello Greg ? I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was. I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands. 73 ? Ian G4GIR ? ? ? ? toggle quoted message Show quoted text ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 18:22:03 Subject: [QRPLabs] QMX+ Boost Power Out on 20M? Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Ian G4GIR All Messages By This Member #127613 开云体育 Sorry Greg, a bit more detail!! ? ? ? toggle quoted message Show quoted text ----- Original Message ----- From: Ian G4GIR via groups.io <g4gir.shack@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 19:08:48 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Hello Greg ? I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was. I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands. 73 ? Ian G4GIR ? ? ? ? ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 18:22:03 Subject: [QRPLabs] QMX+ Boost Power Out on 20M? Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Greg McCain All Messages By This Member #127625 Thank you Ian. Another good reason to buy that decent, entry level O-scope I've been wanting. :) Any chance you could detail the formulas you used for your calculations? (So I could have a quick check spreadsheet ready for when it comes).? Greg toggle quoted message Show quoted text On Sun, Aug 11, 2024 at 2:31 PM, Ian G4GIR <g4gir.shack@...> wrote: Sorry Greg, a bit more detail!! ? ? ? ----- Original Message ----- From: Ian G4GIR via groups.io <g4gir.shack@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 19:08:48 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Hello Greg ? I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was. I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands. 73 ? Ian G4GIR ? ? ? ? ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 18:22:03 Subject: [QRPLabs] QMX+ Boost Power Out on 20M? Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Bruce Akhurst All Messages By This Member #127646 ? ? ? ? ? ? ? Rms watts =( rms volts ^2)/50 ? the ‘50’is the load impedance which must be a 50 ohm dummy load or everything is out from there ? … a newer scope may measure the true RMS voltage ?for you but failing that and assuming a sinewave (so measure after the LPFs) measure peak to peak, ?divide by 2 for peak and multiply by 0.707 for the rms voltage? ? But ?A much shorter formula in this case is (peak to peak^2) /400 = rms watts?
Bruce Akhurst All Messages By This Member #127647 Ian? In your table several of your 'power equivalent values' don't appear to make sense . .
Ian G4GIR All Messages By This Member #127658 开云体育 Yes Bruce I agree total?C*P. I had a mistake in the formula. ? Revised with RMS Values added. ? ? 73 ? Ian toggle quoted message Show quoted text ----- Original Message ----- From: Bruce Akhurst via groups.io <bruce@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 12/08/2024 10:33:52 Subject:** Re: [QRPLabs] QMX+ Boost Power Out on 20M? Ian? In your table several of your 'power equivalent values' don't appear to make sense . .
Ian G4GIR All Messages By This Member #127659 开云体育 Hello Greg ? Sorry for the booboos. ? Here's the formulas in the sheet you asked for. ? 73 ? Ian ? ? toggle quoted message Show quoted text ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 23:23:11 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Thank you Ian. Another good reason to buy that decent, entry level O-scope I've been wanting. :) Any chance you could detail the formulas you used for your calculations? (So I could have a quick check spreadsheet ready for when it comes).? Greg On Sun, Aug 11, 2024 at 2:31 PM, Ian G4GIR <g4gir.shack@...> wrote: Sorry Greg, a bit more detail!! ? ? ? ----- Original Message ----- From: Ian G4GIR via groups.io <g4gir.shack@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 19:08:48 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Hello Greg ? I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was. I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands. 73 ? Ian G4GIR ? ? ? ? ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 18:22:03 Subject: [QRPLabs] QMX+ Boost Power Out on 20M? Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Greg McCain All Messages By This Member #127660 Thank you Ian and Bruce. Greg toggle quoted message Show quoted text On Mon, Aug 12, 2024 at 9:40 AM, Ian G4GIR <g4gir.shack@...> wrote: Hello Greg ? Sorry for the booboos. ? Here's the formulas in the sheet you asked for. ? 73 ? Ian ? ? ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 23:23:11 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Thank you Ian. Another good reason to buy that decent, entry level O-scope I've been wanting. :) Any chance you could detail the formulas you used for your calculations? (So I could have a quick check spreadsheet ready for when it comes).? Greg On Sun, Aug 11, 2024 at 2:31 PM, Ian G4GIR <g4gir.shack@...> wrote: Sorry Greg, a bit more detail!! ? ? ? ----- Original Message ----- From: Ian G4GIR via groups.io <g4gir.shack@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 19:08:48 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Hello Greg ? I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was. I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands. 73 ? Ian G4GIR ? ? ? ? ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 18:22:03 Subject: [QRPLabs] QMX+ Boost Power Out on 20M? Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Greg McCain All Messages By This Member #127673 Hello again folks. Shouldn't the procedure/formula be: Measure Peak to Peak Voltage ( after the LPF filter) into a known good 50 ohm dummy load.? Multiply that figure by 0.7071 to get RMS voltage Square the RMS Voltage figure. Divide that result by 50. Thanks in advance, Greg Greg McCain gamccain50@... On Monday, August 12, 2024 at 09:40:17 AM EDT, Ian G4GIR <g4gir.shack@...> wrote: Hello Greg ? Sorry for the booboos. ? Here's the formulas in the sheet you asked for. ? 73 ? Ian ? ? toggle quoted message Show quoted text ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 23:23:11 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Thank you Ian. Another good reason to buy that decent, entry level O-scope I've been wanting. :) Any chance you could detail the formulas you used for your calculations? (So I could have a quick check spreadsheet ready for when it comes).? Greg On Sun, Aug 11, 2024 at 2:31 PM, Ian G4GIR <g4gir.shack@...> wrote: Sorry Greg, a bit more detail!! ? ? ? ----- Original Message ----- From: Ian G4GIR via groups.io <g4gir.shack@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 19:08:48 Subject: Re: [QRPLabs] QMX+ Boost Power Out on 20M? Hello Greg ? I found a similar pattern with mine, was going to try removing/adding turns on that section, but settled for what is was. I adjusted the turns by compression etc and tried to find a happy medium I could see 6 Watts on 15m but to the detriment of 20 es 17, sub 2 Watts on both bands. 73 ? Ian G4GIR ? ? ? ? ----- Original Message ----- From: Greg McCain via groups.io <gamccain50@...> Reply-To: <[email protected]> To: <[email protected]> Sent: 11/08/2024 18:22:03 Subject: [QRPLabs] QMX+ Boost Power Out on 20M? Just sending this out to see if the smart folks have ideas on what I might be able to do about . .? ? My QMX+ is working just fine. Though, I'm getting the following approximate Power Outputs. BTW - My QMX+ is wound for 12V and my power source is a INIU Power Bank with a 12V PD Trigger adapter. The V+ IN is very stable across all the bands during transmit.? ? 20M - 3.4W 17M - 3.2W 15M - 4.2W ? These power figures were measured/displayed with close agreement between them on: The Internal Diagnostic Tests ?2 different Elecraft W1 Power Meters and from DMM voltage measurements on an Elecraft Dummy Load I use for the . . . well . . .? dummy load? . . . during testing.? ? I've adjusted winding spacings on the LPF toroid pair for this group of bands without getting much more than +/- 0.2 W difference. I realize that a WATT or so difference is pretty insignificant but was just wondering what factors in the typical QMX family of LPFs are related to the amount of RF energy that gets passed through. ? Thanks in advance, ? GREG -? KI4NVX
Bruce Akhurst All Messages By This Member #127675 Greg. ?No? ? peak to peak is twice the peak value? ? ptp /2 is called peak? ? for sine RMS is 0.707 x peak?
Greg McCain All Messages By This Member #127682 DOH..... Completely my bad ... Thanks to everyone who assisted.? Greg toggle quoted message Show quoted text On Mon, Aug 12, 2024 at 2:59 PM, Bruce Akhurst <bruce@...> wrote: Greg. ?No? ? peak to peak is twice the peak value? ? ptp /2 is called peak? ? for sine RMS is 0.707 x peak?

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