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I looked at the U3 and it would be easier to modify for micropower.? However it would buying a new case, gps and tcxo which I already have in the QMX+...? I think I will try something in series with

Stan, ESD should be taken seriously. When I draw a visible spark off my cat's nose, that same charge could easily blow most any IO cell. You are probably right about BS170 gates. I for one have no

I like how the description on Amazon calls it out as a “Power Amplifier Chassis”. With no ventilation whatsoever lol. [email protected]> wrote:

Those are very nice. But I prefer my simple enclosure - it fits perfectly! Yes, just a piece of large shrink-wrap.? The black/white wires are from the rectified voltage terminals, for use with a

FWIW I built and use the circuit Ron Taylor describes, and it works. I call it my Idiot Resistor (as in, it resists me, the idiot). When the wind pushed my antenna over to touch a metal structure, the

Hi Jerry, Indeed… I don’t know how much current it takes to blow either zener. Hans posted a V/I curve he measured for the 3.6V 1/2W Zener and it’s clear that the Zener voltage rises

Jerry, I am glad you use very appropriate ESD precautions for your kit assembly. I would venture to guess that most QMX kit assemblers are not as careful, and may not even be using an anti-static mat

Amazon carries the same product, not out of stock.? Just ordered two of them. https://www.amazon.com/gp/product/B0D1HDFKMS/ref=ox_sc_act_title_2?smid=A3L6TR5DHWPAZG&psc=1

Regarding static safety: The ideal is to have a wrist strap tied to your safety ground, the static mat that the device is sitting on also has a connection to the safety ground. If you don't have a

Reassuring, but it might be several Amps going through those Zeners at times. I think the acid test would be to have the QMX modified to use linear regulators, then have the QMX PWM and ADC lines

Look under 7 Other wrote:

In both my QMX and QMX+ I get birdies in the receiver (some of them quite strong) at several different frequencies.? But they are very narrow, about 100Hz wide.? Meaning that for example, the

I'm missing something - maybe simple. Menu options are: 1 Preset 2 Messages 3 VFO 4 Keyer 5 Decoder 6 Beacon 7 Other 8 Alignment 9 Test Equipment Save Settings Just about any option I select comes up

I removed 1 turn from each 6M LP filter toroid's and my 6M O/P power went from 1W to 3.24W!

I was playing with mine today looking for more “birdies” or what sounds like birdies. I hear the same tone at 21.066 and I think 14.076. That said, what I observed is that the tone is present in

Excellent!? Glad you got it working! As for power output on the upper bands, I think the 'twisted sisters' winding helps with that, making the transformer more efficient.? But if it is already

I have an ATU-100 and it worked fine with the QDX. Now I also have QMX+ and it usually doesn't work automatically. When I send at full power, the QMX+ goes into alarm, when I send at 60%, the ATU-100

Reset (an option in the menu system) and choose 40m. -mike/w1mt [email protected]> wrote:

I recently completed building a QCX-mini from a kit given to me by a friend. I know the kit was purchased before the QMX was available and may have been from 1-2 years prior. As best as I could tell

Thanks for the advice, Dan. Well, I'm quite surprised. Retouched T501 again, no change. Checked Q507 traces, all OK, pins to pads OK. I couldn't see anything wrong in that area so I heated up Q507 and