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I just put the rest of the low pass filter things that I did, which were on different parts of the site, all in the same LPF folder now. The original LPF simulations were from 4 years ago. Sadly,

The synth puts out a more or less square wave which is worked on by the subsequent stages of amplification then filtering. A square wave is the fundamental and all the harmonics. I recall one guy

Like anybody else I can only guess about the reason of your power fade, but my advice is to replace Q6. All the PA current is going through there and even the stronger MPS751 seems to develop problems

I have seen this sort of thing (not on one of the QRP Labs kits, though) and found either a bad capacitor (heating and changing capacitance) or a bad inductor (heating and changing inductance). One

Have you checked Vrf or power at the output side of C29, and then each stage of the LPF? I know of one case where there was 5W at input to LPF with each stage showing progressively less until only 1.8

Ok, I'm just not as sharp or something as I used to be? Got this out together a bit ago. Turned it on, no smoke. Q1 got really hot in about 3 seconds. No display. Pulled Q3, got good input to look

thanks for replies.? running this on a 30 amp power supply, so no voltage droop.? power output is steady, but lower than it used to be.? only Q6 is warm.? tweaking the turns on the toroids is

If it's on a good supply and not depleted batteries as Don suggested, check if any components gets hot after some transmit, besides the Q1-Q3. Perhaps a capacitor in the C25-C32 range ?

Dropping battery voltage. db wb9sts

My 40m version seems to be having fading output power, literally going down with time on my 40m version.? I thought the finals were overstressed with my issues learning to use the GPS, as this

Kent, Did you jumper pin 1 to pin 3 (B+ to DVM) ? ?See page 101 and 121 (where the pins are). ?You need to do this to allow the internal DVM read the battery voltage. ?Turning on the battery icon

Thank you!? I just re-read the manual again and was coming back to post my error.? Read The Fine Manual!?? 73, Kent W9WB

You also need to jumper the tree pin connector close to the DC input, pin 1 to 3 (dvm input to +v).

I enabled the battery meter (Menu 7.2) and connected the QCX to a fully charged (13.1V) 18Ah battery.? The meter is there, but it's showing empty.? I modified Menu 7.3 from 13,800 to 12,000 to see

zl1rs@...> wrote: The output from the synth is squarewave-ish, driving different PA designs in the qrp-labs product line, so not looking the same after amplification. on top of that

Hans, I am very impressed with your QCX CW Transceiver kit. Excellent design from what I can see and an impressive list of functions/capabilities. That's one way of working the kinks out of a new

The home site http://extremeelectronics.co.in/avr-tutorials/gui-software-for-usbasp-based-usb-avr-programmers/ sends you to a site that asks you to accept emails in return for the program. It's your

Hi Paul The doc says about the stock 40m LPF ... "The insertion loss across the band is low and the harmonics are suppressed but not as much as the

Is Extreme Burner AVR downloadable through anywhere but fishy third-party sites?? I can't find one so far.

With "all devices" listed in Zadig, it still shows up as the "Unknown Device" that Win7 errored-out on.? When that entry is selected and the driver package for USBasp described in the instructions is