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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

Using PuTTY and Hans' diagnostic software I think I'm zeroing in my new QMX. My main issue was the 17/15m LPF. After spreading out the L512 windings I was able to improve the 15m output. A little

Hi Paul, It was not actually my idea, I just followed up on Jindra (OK4RM) and Lun Yang (BD8BTE), see the posts above. I still had the desk full from the Q508 diode mod the other day, and I found a

Adrian, My QMX bandpass is actually skewed upward like yours (rather than downward as I posted). In fact, have a look at my attached 80m sweep. Our 80m sweeps are so close we could almost

Hi Hans, You were right on. Hooked up dummy load and it worked like a charm. Shack RF was problem. Any suggestions for? a ferried USB-C cable, most seem to be to short. I could also add my own clamp

Oh my, Jim... How do you dispose of something like that? JZ [email protected]> wrote:

John, I have a block of BeO from a Motorola conduction-cooled PA stage. It's dangerous because all the block edges are as sharp as knives. Naturally, BeO is something you don't want to drop on a hard

Yes, Jim that is correct. Some day it could wind up somewhere that has no such control. My conscience is quieter if I don't use it. BTW, do you remember the BeO envelopes on high power transmitting

John, The article you cited includes this: "the material (beryllium oxide) is safe to handle as long as dust is not generated during machining or handling." 73 Jim N6OTQ

Found the solution to this problem here: /g/QRPLabs/message/116094 Evidently the firmware file was corrupted preventing the QDX from initializing and making it appear

Hi I assembled the KIT, and it works, but the right encoder button doesn't activate the functions as it should. When pushed it acts as the left encoder button. Of course, the hardware test (in