Discussion in 'QRP Corner' started by BD5QCE, Sep 27, 2018.
RX current 85 mA
TX Maximum current 500 mA
I have finished! I am very happy
Always fun to complete a kit and have it work right off the bat.
I was overjoyed when my QCX came to life. It has since operated in WI, IL. AL, MS, FL, GA, MN, SD, WY.
I've used it for everything from SKCC QSOs to competing in state QSO parties, and it was great in everything I've thrown at it. It really surprised me how well it held up in contest conditions. The receiver is outstanding.
Nicely done! Fun project
Is the "RX current" with a signal with volume at max, or idle currnet. 85mA sounds like a lot of idle current !
The manual says 140mA on receive at 13.8V. It has to run the LCD backlit display, SIS frequency synthesizer, and ATMega microcontroller, so it sounds about right. It ain't no SW40!
I dimmed the lights and the current went down
I love my QCX's, one for 40 and one for 20! On 40 I've had many good QSOs, including Hawaii. On 20, exactly one QSO so far, during a short opening. The QCX experience inspired me to buy the Receiver and Polyphase modules from QRP Labs and turn them into a 455 kHz IF. Single signal reception without expensive crystal filters! Whoopee! You can still homebrew in 2019!
Some of the biggest draws are the linear regulator, the op amps, and the LCD backlight. Some power saving mods address these.
I swapped in a little traco switching drop-in replacement for the lm7805 on mine, which should save me a chunk. I need to measure it to see how it came out...