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This is a *very serious problem* and in my opinion the QMX should NOT be used with headphones as there is a very real risk of hearing damage.? The first time it happened to me, I was using some JVC

Yes, that is quite the power out. I would be concerned about stressing the finals, in addition to no longer being able to claim QRP status! I also would like to know what the current voltage levels

Mike if you can post images of the Diagnostic screen in TX both for 12V and 9V operation. It may reveal nothing, but it will be good to check. JZ

We'll have to check that out tomorrow. Thank you John.

Mike, When running at 12V what does your diagnostics screen say about the voltage produced by the 5V SMPS? JZ [email protected]> wrote:

I disagree with Mushin on this. I built a multiband QRP-Labs amp for the QDX and it worked fine. I used the QRP-Labs ultimate low pass filter kit for holding the filters and do the switching. If you

OK, good to know. That's quite a performance from QMX. JZ

John, We were using an Oak Hills Research QRP wattmeter with good calibration into a 50 ohm dummy load.

Mike describe how the measurements were made: what instrument? dummy load? JZ KJ4A

My son built a low-band QMX last weekend.? He built it for 12 volts with a 3:2 RWTST T501.? We were checking the power output at 12 volts this evening and found 5 watts on 20 meters and close to 8

Oh, and to Jim, AJ8S who first suggested it. Paul, W9AC

(2 x nothing) is still nothing :-(

It's quite amazing what can be learned from the members of this online community! Thanks for the interesting info, Don! JZ KJ4A

Diamond, especially nitrogen-free type IIa is an even better conductor, 3 times that of aluminum nitride and BeO and 2.5 times pure copper.? Companies are also manufacturing diamond-like films, and

Most cases of berylliosis are associated with repeated or long-term exposure. Handle it carefully and you'll be fine. It's one of those "it's DANGEROUS!!" ham radio chemicals like PCB oil

Thank you very much Steve. With the firmware update to version 14, the audio problem was apparently solved. The problem I'm having now is that the volume encoder doesn't work. I am waiting for a local

Adrian, That worked very well. I made the mod this afternoon and the result mirrors yours as well as the RF Sweeps shown in the QMX Operating Manual. Like you, I added a 470 pF cap across C402 but

Looking at several commercial and government online resources, it seems that while BeO can be an irritant and can cause a number of skin and lung ailments, it is not toxic to the point where a small

How would I dispose of broken BeO? Not sure. For the intact block, as-is, I'd just put it back in the PA deck after my testing is finished and documented. Maybe someday we can use diamond for a BeO

To prove the law of YMMV, here are my results from some extensive tweaking of the LPFs. I'm a happy camper too... I added 30M instead of 11M as you can see. QMX high band rev 2 RWTST