Re: QMX+ Boost Power Out on 20M?
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
?
?
----- Original Message -----
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 -----
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 -----
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
|
Hi Mark
As with most of Hans kits the QCX has the ability to become a multiband XCVR
The low pass filter (LPF) is primarily the band ?defining element
Donot install the LPF on the main PCB?
You will need to install a jumper in lieu of LPF
Then locate the LPF elsewhere
72 73
John
N3AAZ
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|
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Re: QMX out-of-band Presets
On Mon, Aug 12, 2024 at 06:12 AM, Hans Summers wrote:
?"edit the Band Configuration screen to get all the frequencies you want to use included in one of the bands"
?
Thank you Hans.? Problem solved. ?
?
Tom, K9AC
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Re: QMX+ build complete. Minor hiccup on 3 volt power supply board.
Very good advice. Probably going to order a qmx+ which will be my most extensive build so far. Definitely going to implement checks as I forge ahead.
--
Wayne S.
KF7RCM
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Re: QMX+ build complete. Minor hiccup on 3 volt power supply board.
Looks the the resistor next to it might be burned.? ICT is a fairly economical way to weed these issues out in production but that would add to product cost.? My take on it for the QMX would be to re-order the assembly instructions into functional blocks and create subassembly tests before proceeding to the next section.? This has been done with the supplies to test them off board which could be extended to the transceiver board, allowing for at least some confidence of function without having to build the whole thing first and relying on a current limited power supply for fault mitigation.
?
Mark K5LXP
Albuquerque, NM
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Thanks for taking the time to respond, Hans. Very interesting. I suspected 40 and 20 would be the most popular. I recently acquired an unassembled QCX+ and was trying to decide which band to build it for. Still undecided. :)
?
Wow...20k kits sold...impressive.
--
73...? ? ? Mark? ? ?AA7TA
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QMX+ build complete. Minor hiccup on 3 volt power supply board.
I just completed my latest build, the QMX+. I really like this radio (and my 2 QMX) and it was fun to build. Thanks to Hans Summers for this excellent radio kit. I had one minor problem that I was able to recover from.
?
Short summary (pardon the pun).
?
The QMX+ drew excessive current when first turned on. I had my bench supply set for 0.5 amps max. It maxed out.
?
The 3 volt regulator board had HOT parts. The board's 3 volt line showed around 200 ohms. I found a solder bridge, but from the factory solder work. A diode had been soldered on the board after the other surface mount parts had been flow soldered on. The solder bridge was between D105 cathode and the adjacent lead of Q110.
?
Fortunately I had on hand a spare set of power supply boards, purchased previously. No harm done. Radio works great. The 3.6 volt zener protection diode did it's job.
?
Moral of the story is... Check for not only your own solder bridges, but check the factory soldering too.
?
I just now ordered the add-on GPS for my QMX+, and included some spare power supply boards. Just in case.
?
W8EH
?
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Affirmative on the dummy load. Before power is applied on any set I put one on.
--
Wayne S.
KF7RCM
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Re: straight key and semi qsk
Could you try 100 and 900 ms? Does it seem different?
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Re: QMX+ Toasted L-518 Toroid -- Cause ?
I see a splash of tomato sauce in the corner
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Re: QCX mini build for 15m - questions about LPF components
thank you so much Hans! ? do you ever sleep??? ?;-)
No!
73 Hans G0UPL
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Re: QCX mini build for 15m - questions about LPF components
thank you so much Hans! ? do you ever sleep??? ?;-)
best regards
Mark
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Re: QMX+ Boost Power Out on 20M?
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 -----
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 -----
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 -----
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
|
Re: QMX+ Boost Power Out on 20M?
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 -----
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 -----
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 -----
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
|
Re: QMX+ Boost Power Out on 20M?
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@...>
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 . .
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That level 10 on the bpf adjustment is abnormally high. Did you have a dummy load attached when you did those adjustments?? It¡¯s usually a peak in the 8 range indicating normal sensitivity and will be higher without a dummy load. I was trying to ascertain whether you had the normal receiver sensitivity or not. Maybe one more time with a dummy load of not used previously??? Ron
Just to note, some months back I did a factory reset to resolve some issues, though I don't see how it would play into this. Did the alignment this evening, set the frequency to 14050. What is interesting is the nulls were significantly off. At 8.7, the peak was at 10, which is where it was from day one. The I-Q Balance was a little higher than I remember but Phase Low and High had alot of room for adjustment. I went back and forth several times to get the lowest values. I couldn't test it as the band went completely dead due to solar activity. Hopefully I will get a chance soon. I am toying with the idea of selling it. I really enjoy the mini you built for me and I don't need two. Flirting with the idea of a QMX+ KIT. Anyway, Thank you for your help, I will post a follow up asap.
--
Wayne S.
KF7RCM
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Re: N1MM Logger+'s built-in spectrum display works with QMX I/Q output now
+1 ??
Looking forward to your plans to make Android into a panadapter and CAT machine.... But already the current version on Windows is really great - impressive!
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Re: My #QMX died :-(
#qmx
I'm running my QMX on a couple of linear regulators.? I managed to fit a couple of TO220 linears onto some veroboard which fits inside the case and plugs into the PSU connectors on the main board.
?
Chris, G5CTH
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Re: QMX out-of-band Presets
Hello Tom
I think you'd need to adjust the Band Configuration screen to enlarge the band limits. In earlier firmware versions there were issues with Preset frequencies loading; it changed the VFO but not the band selection. This was fixed. Which means now when you load a Preset frequency, it looks in the band table to find out which band to select for this. If the frequency doesn't fall into any band it isn't going to work and will just default to the lowest band. 80m in your case. Maybe the defaults need to be changed so that continuous RX coverage is possible.?
This isn't related to the new "Band Limits" setting, this applies "Band" to mean the amateur band allocation (in US, or Japan, for the two choices "ITU Region 2" and "Japan" respectively). RX out of band means receive is allowed outside the amateur band; but the frequency would still need to fit inside one of the defined bands in the Band Configuration screen otherwise the system will not know which filters to choose.?
So I think the appropriate short-term solution here is for you to edit the Band Configuration screen to get all the frequencies you want to use included in one of the bands. The longer term solution is probably to alter the Band Configuration screen such that the continuous coverage is provided by default.?
Some out-of-band presets default to 3573000.
?
Presets:?
15000000 WWV Time standard
12808500 KPH Maritime Coast Station
? ? ? ? ??
When attempting to load, the VFO goes to 3573000. \
These presets worked OK in FW 1_00_023.?
?
(13690000 Radio New Zealand loads OK.)
?
Setup:
QMX Rev. 1
FW: 1_00_026?
Band version: 80-20
Band limits: None
RX outside band: ON
?
-Tom
K9AC
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Ronald Taylor