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OK Ken. I used the U3S Park mode LO here on my QRP Labs RX for WSPR RX (single band) before RX mode was introduced more recently, and the sensitivity was fine (very little difference between

Likely around an inch, not enough to facilitate testing. For testing you want RF connectors to hook up loads and such. Allison

Josh, You have pointed out of of my tech references (including Khan's paper in '52) and others. Whats useful about the Polar explorer is where you end up when you build hardware to get a still less

Yes Bob, I tried the Park mode method but I got really poor Rx sensitivity (park freq at 4xLo). Also I can’t choose the Lpf/Bpf postion in park mode. 73 Ken G4apb

If possible can someone provide the size, length and type of wiring between the PA and the main board.? If possible, I would like to solder on the final connections to use for testing rather than

Hi Ken, I assume you are asking about using the U3S 'RX' mode specifically, rather than using Park Mode for the QRP Labs Receiver kit's local oscillator signal as per the example and description in

Hi Roger, I should have explained my Rx module is part of my U3S transceiver which I also use for WSPR. The VFO module does not provide the WSPR function. But I did want to use the same rig to do Tx

Hi Ken. I feed my receiver using the vfo module. It sits in a case just like my u3s, and runs independently of it. As of this minute it has been receiving 40m wspr for three or four days straight. If

Hi Brian, you have just solved a long standing problem I had with CW not working for me too! I have a U3S Receiver. Is there also a trick to make it stay in receive mode continuously? I use it set for

I had to add 6 turns.? Joe W3TTT

Thanks Norm Our family got hit by flu (proper flu: fever, doctor, injection, medicine, several days in bed) this last week but nothing out of the ordinary for this time of year. Other than that my

Hello all - sorry that my first post is wading into a mostly-off-topic thread, but I've been thinking about this topic for quite some time (ever since QEX published an article in the March/April 2017

I just found this group through a posting in?the eHam forum and glad I did because?I'm?interested?in the QSX! I also wish the designer well and hope he gets better soon.

If there is any reactance to the loads on S1 and S1, it will be coupled into the S3 tuned circuit, affecting the resonant frequency.? I assume that these reactances are minimal and fairly stable, and

France, No reason to believe this build is not repairable, and requires the purchase of a new kit. *May I suggest you concentrate in clearing the transmit "fault" first. * Are you sure you have

Alan,? Understood. I read that note in the manual but I didn't expect the values to be that far off. Still waiting on the first QSO but things look good on WSPR.? Thanks for helping a confused

I agree, the varactor scheme would be cranky to work with. We could calibrate out non-linearities and temp dependence in software, operating at VHF so we are in a reasonably linear part of the

Hi OM. I was testing my inoperative QCX and you were right. The device has a bad RX, but it also stops transmitting. So I do not know what to do if I try to fix it or if I want to buy a new device at

Hi OM. I was testing my inoperative QCX and you were right. The device has a bad RX, but it also stops transmitting. So I do not know what to do if I try to fix it or if I want to buy a new device at

I’m in! Alan W3AL