Re: QDX on 30m this morning
Tnx QSO, WB4EVH
72,
Bill, N4QA
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Re: QMX high current consumption when input voltage above 10 Volt
For completeness, check Q501 for shorts as well.? JZ
On Tue, Jul 25, 2023, 7:56 AM John Zbrozek < jdzbrozek@...> wrote: Gunnar, one more thing... With power off check the resistance from Q502 gate to drain and gate to source. If a short to gate has developed both Q502 and Q501 will exhibit elevated temperatures.
JZ
On Tue, Jul 25, 2023, 7:35 AM John Zbrozek < jdzbrozek@...> wrote: Gunnar,
It is as if the feedback loop that controls the bias buck converter is not working.
Check at both sides of R505 to make sure the ADC is getting a converter output sense signal. Check at the gate of Q501 to make sure a controlling PWM signal is present.
JZ KJ4A?
On Tue, Jul 25, 2023, 7:05 AM John Zbrozek < jdzbrozek@...> wrote: Peter,
Gunnar should be able to receive at 12v without drawing excessive current. Had he wired for 12v operation, that would be mandatory. I believe he is correct in his assessment that something is amiss.
JZ KJ4A?
On Tue, Jul 25, 2023, 6:37 AM G3SPL < leepd60@...> wrote: On Mon, Jul 24, 2023 at 10:58 PM, <Ugglekatten@...> wrote:
My newly built QMX has a strange behaviour...
When supply voltage is 9V current consumption on receive is 110mA on tranmit 1.27A
Output power is fine on all bands.
I can hear signals on all bands
But when i raise supply voltage to 10.5V the current consumtion goes to 220mA, at 11V it goes to 300mAn (always in receive)
Hi Gunnar.? You say that the QMX works fine with good receive and output power when operating with 9V.? Why are you trying to run a higher voltage supply?
?
--
Peter Lee
G3SPL
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Re: Here's what QSOs look like from the W4MAI ( SK 2006 ) Memorial Sun room monitoring station.
Tnx agn, WB4EVH.
72,
Bill, N4QA
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Re: QMX high current consumption when input voltage above 10 Volt
Gunnar, one more thing... With power off check the resistance from Q502 gate to drain and gate to source. If a short to gate has developed both Q502 and Q501 will exhibit elevated temperatures.
JZ
On Tue, Jul 25, 2023, 7:35 AM John Zbrozek < jdzbrozek@...> wrote: Gunnar,
It is as if the feedback loop that controls the bias buck converter is not working.
Check at both sides of R505 to make sure the ADC is getting a converter output sense signal. Check at the gate of Q501 to make sure a controlling PWM signal is present.
JZ KJ4A?
On Tue, Jul 25, 2023, 7:05 AM John Zbrozek < jdzbrozek@...> wrote: Peter,
Gunnar should be able to receive at 12v without drawing excessive current. Had he wired for 12v operation, that would be mandatory. I believe he is correct in his assessment that something is amiss.
JZ KJ4A?
On Tue, Jul 25, 2023, 6:37 AM G3SPL < leepd60@...> wrote: On Mon, Jul 24, 2023 at 10:58 PM, <Ugglekatten@...> wrote:
My newly built QMX has a strange behaviour...
When supply voltage is 9V current consumption on receive is 110mA on tranmit 1.27A
Output power is fine on all bands.
I can hear signals on all bands
But when i raise supply voltage to 10.5V the current consumtion goes to 220mA, at 11V it goes to 300mAn (always in receive)
Hi Gunnar.? You say that the QMX works fine with good receive and output power when operating with 9V.? Why are you trying to run a higher voltage supply?
?
--
Peter Lee
G3SPL
|
Re: QMX high current consumption when input voltage above 10 Volt
On Tue, Jul 25, 2023 at 12:06 PM, John Z wrote:
Peter,
?
Gunnar should be able to receive at 12v without drawing excessive current. Had he wired for 12v operation, that would be mandatory. I believe he is correct in his assessment that something is amiss.
?
JZ KJ4A?
?
?Good point, John! -- Peter Lee G3SPL
|
Re: QMX high current consumption when input voltage above 10 Volt
Gunnar,
It is as if the feedback loop that controls the bias buck converter is not working.
Check at both sides of R505 to make sure the ADC is getting a converter output sense signal. Check at the gate of Q501 to make sure a controlling PWM signal is present.
JZ KJ4A?
On Tue, Jul 25, 2023, 7:05 AM John Zbrozek < jdzbrozek@...> wrote: Peter,
Gunnar should be able to receive at 12v without drawing excessive current. Had he wired for 12v operation, that would be mandatory. I believe he is correct in his assessment that something is amiss.
JZ KJ4A?
On Tue, Jul 25, 2023, 6:37 AM G3SPL < leepd60@...> wrote: On Mon, Jul 24, 2023 at 10:58 PM, <Ugglekatten@...> wrote:
My newly built QMX has a strange behaviour...
When supply voltage is 9V current consumption on receive is 110mA on tranmit 1.27A
Output power is fine on all bands.
I can hear signals on all bands
But when i raise supply voltage to 10.5V the current consumtion goes to 220mA, at 11V it goes to 300mAn (always in receive)
Hi Gunnar.? You say that the QMX works fine with good receive and output power when operating with 9V.? Why are you trying to run a higher voltage supply?
?
--
Peter Lee
G3SPL
|
Re: QMX high current consumption when input voltage above 10 Volt
On 25/07/2023 10:37, G3SPL wrote: Why are you trying to run a higher voltage supply? Peter, That is a good question. But it does seem strange. Assuming that transmit is not attempted I'd expect the current to go down as voltage is increased due to the switched regulators on board. 73 Alan G4ZFQ
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Re: QMX USB socket not soldered?
#qmx
Mine looked like that also. Worked fine without doing anything.?
--
73, Dan? NM3A
|
Re: QMX high current consumption when input voltage above 10 Volt
Peter,
Gunnar should be able to receive at 12v without drawing excessive current. Had he wired for 12v operation, that would be mandatory. I believe he is correct in his assessment that something is amiss.
JZ KJ4A?
On Tue, Jul 25, 2023, 6:37 AM G3SPL < leepd60@...> wrote: On Mon, Jul 24, 2023 at 10:58 PM, <Ugglekatten@...> wrote:
My newly built QMX has a strange behaviour...
When supply voltage is 9V current consumption on receive is 110mA on tranmit 1.27A
Output power is fine on all bands.
I can hear signals on all bands
But when i raise supply voltage to 10.5V the current consumtion goes to 220mA, at 11V it goes to 300mAn (always in receive)
Hi Gunnar.? You say that the QMX works fine with good receive and output power when operating with 9V.? Why are you trying to run a higher voltage supply?
?
--
Peter Lee
G3SPL
|
Re: QMX KIT Delivered today
Mine just been delivered #72373
---------------------------------
73 de Marek SP9TKW
|
Re: QMX USB socket not soldered?
#qmx
Thanks for the reassurance Hans, All my qrplabs builds have worked well up to now, I dont want to blot my copybook.?? Confidence ebbs as age and poor eyesight progress..? best regards? ? ? scotty
On Tuesday, 25 July 2023 at 11:56:20 BST, Hans Summers <hans.summers@...> wrote:
Hi Scotty
Things like this happen. Ever try manufacturing anything of anywhere near this level of complexity and you'll quickly come to understand, a thousand things can go wrong, and some actually will.?
In this case it only LOOKS like there's a problem. There's solder in the holes. Good connection. Because all the boards are tested. So you don't need to do anything, 99% sure it will work fine with no intervention. I just added that step in the manual as a precaution.?
FYI I specifically searched for this USB-C connector at Digikey for it's high-quality and the fact that it has pins not SMD pads, because I believe it will be more robust and durable. A connector with only SMD pins is much more prone to dry joints and mechanical issues. 73 Hans G0UPL
Same here , two of the mounting pins soldered, none of the other. Not sure if I have the neccessary steady hand or eyesight to remedy. Its disapointing to say the least. Scotty
On Tuesday, 25 July 2023 at 11:10:26 BST, Peter GM0EUL < gm0eul@...> wrote:
Mine looked like that too.? I just re-flowed it with plenty of flux, a big blob of solder and wicked it off.? Scrubbed it clean with isopropanol and inspected it with my loupe.?
73 Peter GM0EUL
CWops 1899. FISTS 18888, SKCC 16307T, GQRP 15056
|
Re: QMX USB socket not soldered?
#qmx
Hi Scotty
Things like this happen. Ever try manufacturing anything of anywhere near this level of complexity and you'll quickly come to understand, a thousand things can go wrong, and some actually will.?
In this case it only LOOKS like there's a problem. There's solder in the holes. Good connection. Because all the boards are tested. So you don't need to do anything, 99% sure it will work fine with no intervention. I just added that step in the manual as a precaution.?
FYI I specifically searched for this USB-C connector at Digikey for it's high-quality and the fact that it has pins not SMD pads, because I believe it will be more robust and durable. A connector with only SMD pins is much more prone to dry joints and mechanical issues. 73 Hans G0UPL
Same here , two of the mounting pins soldered, none of the other. Not sure if I have the neccessary steady hand or eyesight to remedy. Its disapointing to say the least. Scotty
On Tuesday, 25 July 2023 at 11:10:26 BST, Peter GM0EUL < gm0eul@...> wrote:
Mine looked like that too.? I just re-flowed it with plenty of flux, a big blob of solder and wicked it off.? Scrubbed it clean with isopropanol and inspected it with my loupe.?
73 Peter GM0EUL
CWops 1899. FISTS 18888, SKCC 16307T, GQRP 15056
|
Re: QMX USB socket not soldered?
#qmx
Same here , two of the mounting pins soldered, none of the other. Not sure if I have the neccessary steady hand or eyesight to remedy. Its disapointing to say the least. Scotty
On Tuesday, 25 July 2023 at 11:10:26 BST, Peter GM0EUL <gm0eul@...> wrote:
Mine looked like that too.? I just re-flowed it with plenty of flux, a big blob of solder and wicked it off.? Scrubbed it clean with isopropanol and inspected it with my loupe.?
73 Peter GM0EUL
CWops 1899. FISTS 18888, SKCC 16307T, GQRP 15056
|
Re: QMX USB socket not soldered?
#qmx
Both of mine looked like that. I touched up one and left the other alone. Both work fine. The paste is hidden under the jack. I won’t be touching up any more.?
-Mike/w1mt
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Re: QMX USB socket not soldered?
#qmx
They all look bad, like they're unsoldered. But actually they are OK. As a precaution, the assembly manual has a step about touching up the connections with some solder. But in actual fact by definition the connector is OK and electrical connection is made, since it is part of our testing during preparation of the board. But sure, it looks like too little solder on there. A bit more can't hurt.?
The next batch of 1100 PCBs are in Istanbul for customs clearance today. I did kick the PCB factory about the USB-C soldering so let's see if they're better this time! 73 Hans G0UPL
Thanks? - I shall be doing the same and not worry!
|
Re: QMX high current consumption when input voltage above 10 Volt
On Mon, Jul 24, 2023 at 10:58 PM, <Ugglekatten@...> wrote:
My newly built QMX has a strange behaviour...
When supply voltage is 9V current consumption on receive is 110mA on tranmit 1.27A
Output power is fine on all bands.
I can hear signals on all bands
But when i raise supply voltage to 10.5V the current consumtion goes to 220mA, at 11V it goes to 300mAn (always in receive)
Hi Gunnar.? You say that the QMX works fine with good receive and output power when operating with 9V.? Why are you trying to run a higher voltage supply? ? -- Peter Lee G3SPL
|
Re: QMX USB socket not soldered?
#qmx
Thanks? - I shall be doing the same and not worry!
|
Re: QMX USB socket not soldered?
#qmx
Mine looked like that too.? I just re-flowed it with plenty of flux, a big blob of solder and wicked it off.? Scrubbed it clean with isopropanol and inspected it with my loupe.?
73 Peter GM0EUL
CWops 1899. FISTS 18888, SKCC 16307T, GQRP 15056
|
QMX USB socket not soldered?
#qmx
I received my QMX today (Thanks Hans!) and am just sorting all the parts out and checking the boards over.
I know it's recommended to touch up the soldering of the USB socket, but it looks like it hasn't been flowed at all - is this normal? Happy to solder it, just interested to know.
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Re: QMX KIT Delivered today
|
Marek SP9TKW
ZL1SGS
Peter GM0EUL