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Hello Barb The maximum power dissipation of a BS170 according to the ON Semi datasheet (these are the devices we supply) is 0.83 Watts. If a QCX was producing 5W output at 60% efficiency the heat

Hans, I have QCX V1 and I adapted for usdx and used it with 1x BS170 without any problems many months. The PA efficiency is 60 to 70% which does not create significant excess heat. Actually that QCX

Wrongly wound SWR transformer? [email protected]> wrote:

Abbott & Costello did a great variation on it using "Susquehanna Hat Company" as the trigger phrase. https://www.youtube.com/watch?v=EJxLDdIVX6g

I've got a homebrew QRP power meter (photo of schematic) and it showed 17.7v (+3w) in my DVM.? That's quite a bit more than <.5w!? I'm gonna go back and reflow the toroids and transformers.? Maybe

Hi Barb No... all you do then is fry the BS170. The point of multiple BS170's is less about reducing the effective switch "on" resistance due to paralleling multiple devices. It's more to do with the

Barb, I wonder. I seem to remember that essentially the paralleled devices share the load. That has been mentioned with the U3S. Would just one be overloaded? In any case if the power was reduced to

The easiest mod is to remove 2xBS170 and run on one BS170. QCX will be in QRPp range now with this mod. -- 73, Barb

Hello Chris I didn't have any plans for such a thing... the LCD_LED line is not connected to a Timer PWM output. Which makes it harder (not impossible); PWM'ing 10mA of LED would also inflict a

Question for Hans, are there any plans to be able to control the LCD display brightness in software?? Superficially it seems easy to drive the LCD_LED line with a PWM output which can be adjusted in

I have the same problem with a V2 QMX that affects both left and right encoders.? When turning the left encoder the volume level sometimes jumps many steps.? With the right encoder I have the issue

It also has the potential to be wildly misleading. 10dB may be one thing but if you go much beyond that, you will *think* you are really transmitting a certain amount of power, being your produced

Chris, With respect this sort of thing is good for black box users. But my feeling is that generating "vast" amounts of power then wasting it in an attenuator is not really true QRP. I think

Hi, can confirm this problem. My right encoder goes forward and backwards when turned slowly. The leftone is working precisely. Vy 73, Peter DL4PJ

Links to SotaBeams switched attenuator (switched in by relay on transmit/switched out when not transmitting, on

QMX observations FW 1_00_017 QMX covers the 80m-20m band, but I don't use the 80m band, so I chose it for the 40m-15m band. 1.Setting japanese limits to ENABLED. When transmitting at 17m and 15m BAND

I touched up the solder joints on all the LPF capacitors and toroids, and also adjusted the turns spacings on L401 to match more closely the photo in the assembly manual.? Reconnected the radio to

I agree that it is unlikely that Hans will want to find time for incorporate a reflectometer into the QDX with associated extra software in the controller.? Part of the problem is that, unlike the

Yes, that one had me questioning my sanity when I first connected the straight key. Ring is tip and tip is ring! :) 73, -Lloyd Sent: Saturday, February 24, 2024 9:13 PM To:

So, is this "resolved" or ?? TIA for an answer. es vy 73 de "baab" w9ya