My apologies and my bad. I'll reach out to Hans directly.

#40m

Glen, the problem discussed in the referenced article was found in the prototype QCX Mini. See the first sentence in the article. It was corrected before the first production kit was sold. The article

#40m

Hans support is second to none. You won't earn any brownie points slagging off qrpLabs products. I suggest a polite email to Hans many get you some help. 73 from Clive G8POC

#40m

Luc, that's got to be it. Normally one would expect the manufacturer to provide at the very least a pack of replacement caps to those customers who bought those earlier boards or even a [Digikey?] pic

#40m

Glen, since you mention "finally" ... you probably have one of the first batch? and "moving the rig" makes these noises, makes me think about the microphonics problem in the early models, read this re

#40m

Sounds like a good next step. Good luck.

#40m

Yes I have Yamaha C500 which at your suggestion worked nicely even better than the H Pro70. However, the other noises are still present if I tap, move or just touch the case. I think before I go any f

#40m

Glen, do you have any other headphones or even earbuds you could try? Sometimes the QCX behaves better with headphone impedances higher than 8 ohms, like the 32 ohm “Walkman” type or most earbud types

#40m

I finally got my [pre-assembled] QCX-mini CW 40m on the air (don't ask) and even though I was able to make a local contact, the operation was hampered by very noisy headset connection (Heil Pro70). Ha

#40m

700 mA is very normal for QCX transmit current drain. BUT 46v P-P is 5.29 watts and 40v P-P is 4 watts .....if connected to a 50 ohm dummy load. The formula is V (p-p) squared divided by 400 for a 50

#40m #power #qcx

If you're measuring that much RF output you're probably running at too high of input voltage. Doing that increases the likelihood of destroying your output transistors, generally as a result of high S

#40m #power #qcx

Hello So I finished my first qcx mini 40m build. 1.) First question I have is what do you commonly see with current draw on transmitt. 2.) What method did you use to measure the output power. (oscillo

#40m #power #qcx

Oops. Didn’t see the followup. Sounds like all is well 73…Ron

#40m

One I fixed for someone with this issue also had the 1.2 K installed where a 10K was supposed to be. So I was able to swap them. Glad that was it. Good luck. Ron

#40m

Hello Ron Followup, My friend had the 1.2k so we replaced it today and got 3.5w YES sorry I overlooked the resistor. We will finish tuning power tomorrow. Thank you very much for the logical step trou

#40m

Hello Ron You called it, I checked over and over and R42 is not correct. It a 10K. I even missed it on the component check.... I am not the kit builder but trying to help the ham. This will take some

#40m

Mark, check the gate of Q4 for 5v when keyed and 0 volts when receiving. Then check the drain of Q4 for around 12v on receive, going to 0 volts when the key is pressed. If the above Q4 teats are good

#40m

Hello Rod thanks for sticking with me. Previous measurements were taken with an analog meter, and switched to a fluke 87. Kids dont learn how to tell time anymore. (Q6) DC voltage at emitter 12v const

#40m

Mark, at this point you should measure the DC voltage at emitter and collector of Q6. You should see 12v on the emitter all the time and on the collector only when the key is pressed. Key transmission

#40m

This may seem a little silly if you have fixed already your problem. But when I look at a transmitter problem I always start at the beginning and follow the rf path to the antenna. If you don't have d

#40m