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I have a QDX (board rev 3a) for 80-20m that I'd used successfully on a number of outings. On a recent SOTA attempt, however, transmit on the 20m band stopped working after about 15 minutes. I switched

Hi all, next Monday, July 15, is the next *QCX WARC Party*. See https://www.qrp-labs.com/qcxmini/qcxwarc.html for all info Join the discord page in the #qcx-qrp-operation channel to post your QRG

WSJT-X has a band/freq selection window lower left. These are click selectable on Windows 7 on up. Click on your choice and radio instantly displays the freq. I am sure you already know this but I

Could someone provide a circuit description for Q202 and Q201 in the Driver_Bias part of the schematic? I'm also have a problem setting the bias on Q207 (Q208 is OK). I increase the pot to

That is fantastic, welcome back. You need to try Parks On The Air. This is a real good way to get your CW speed up. It's a short exchange and lots of fun. POTA has a great web

When you force firmware update method be sure you are connecting between AUX2 and Ground. I looked at the picture and connected between the two red arrow points. Be sure you are connecting between

Don, Its 350W and 1db compression is likely above that. if he gets 260 hes less than 3db down. If the QRPL amp is run at 15-18V it will give you more I usually see 11W at 13.6V and at 16V more like

50 years ago the great hams of Salt Lake City helped me to get my ticket, build/checkout an HW-101 100 watt radio, and get on the air with CW at 13WPM and SSB. After about 5 years on the air, I sold

My I/Q diagnosis looks much worse. I can see the 90 deg phase shift clearly but the signals are extremely noisy. My receive sensitivity seems to be fine though. I compared it to my K3 with an antenna

James, Check that you have properly removed the enamel insulation and have a good solder joint at the 60 m end connection to L401. JZ [email protected]> wrote:

The USB cable is OK. The problem is in the QMX: What happens when the firmware update process is interrupted? Is it possible that the firmware gets corrupted so that there is no working firmware?

Have you tried a different USB lead? 73 John M0JBA

My 60-15M QMX hears 1 microvolt easily on 40 through 15 but needs an S9 signal or better on 60 meters. I'm not going to operate on 60 meters so I wont be fixing it but wanted to post this in case it

Dear Dan, I am in about the same position as you are... I did find a short under the GPS Module where the jumper for the VDD power was touching the GPS antenna jack. I have been inspecting my board

Thanks Ludwig. I've started looking at it. Let me see what I can find out. -- Dan Reynolds -- KB9JLO <><

Finally getting the qcx-mini broke in for summer camping season. One thing I have been noticing it the AGC has a remarkable pop on the first character sent from a strong station. With AGC off there is

Have a look here David, I use a 6 band u3s running on 12v into a bank of 5v regulators, power out from 1w to 0.1w, can be heard worldwide, also lots of different modes available, also running a gps to

Bruce, Another way you might be suffering high noise while having acceptable sweeps is if there is a problem with IC401, the stereo DAC that drives the headphone amplifiers. Finally, sitting between

Again, the numbers do not add up. Unless the amplifier has a lot of gain expansion (compression is more likely) 10 W will only give 260W, far short of the desired 350-400W. I suspect that something

Hi Bruce. I'm listening to 15M CW right now and the band is full of CQ TEST. SKCC contest, I think. So, AFAIK, my mid-band QMX is working just fine. I've had QSOs on every band where my antenna is