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I think I use 120 ohms in my builds. -mike/w1mt

I am finding the brightness of the QMX display to be too high. I want to increase R306 (33 ohms) to lower that.??I'm thinking about 100 ohms. Any other suggestions as to what would be a good

Hi Dan RF envelope shaping requires amplitude modulation capability for the PA. QDX does not have this, QMX does. 73 Hans

John, Your explanation of QDX L14 makes sense. It doesn't seem to be a serious problem for semiconductor failures tho. More of an issue for spectrum 'dirtiness'. The diode would take care of both

Not too late, Bev - I added a note to your order. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

As a final test I fed the QMX with two external regulated supplies, 3.3v and 5.0v and provided for ADC_3V3 and ADC5V with two potential dividers. Unfortunately, the QMX reacts in exactly the same way

ND6T has pointed out that this can be done with an external adapter that will leave no permanent modification to your rig and could be used with any homebuilt

I don't think anyone is arguing that the diodes are the best solution to the problem long term, but they can be done now with minimal cost and effort, and will help protect your hearing.? They will

Link appears to be dead or broken Bob KG5GTE

Hi Hans Is it too late to ask for 9V option for QMX serial 72387? Regards Bev COAA Portugal

Whoppie!!!! 73, Cliff, AE5ZA

Garrett, Your results seem inconsistent to me like maybe a probe is on the wrong place. You say B1 & B2 have continuity, and A1,2,3 to B1 is open, but to B2 is 10 ohms. Either B1 to B2 does NOT have

Greetings, Using my QDX for the past year or so. Very, Very happy with the radio. Last night I noticed I lost reception. Checked WSPR for reception of any kind..... nothing. 9 volts in and 4.2 watts

Hello Bev 12V unless you specifically ask for 9V. 73 Hans G0UPL http://qrp-labs.com https://www.buymeacoffee.com/g0upl

Parks On The Air (POTA) with my QMX (#133) has found a 100% activation success rate using a simple wire antenna that tunes 40M and 20M with the aid of the 4 State Tuner. 18 gauge speaker wire with one

My QMX is getting close to the head of the queue.? Will it be built for a 12V supply or a 9V supply? Regards Bev COAA Portugal

Yay! Roger ?Get BlueMail for Android ?

Hey, all! I moved my radio over to a PI and it works!!

First rule out solder bridges and stray pieces of wire on your board. ?My experience in this kind of short on a QMX main board is that it’s from a failed chip. ?5V is supplied to the chips in the

Hi Glenn, There is a short somewhere. ?VCC (5V is getting pulled down). ?Also what concerns me most is the LIN_REG_EN signal. ?It is supposed to be at logic levels (0V to 3.3V) and is directly