Date   
2 x 20m WSPR/QRSS balloons launched back to back By HF · #31639 ·
Source for 10140kHz crystals By HF · #31338 ·
The Darkest Day of the Year coming(for Balloons) By HF · #29564 ·
frequency calculation FP error? By HF · #29434 ·
frequency calculation FP error? By HF · #29433 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #29337 ·
FOX TCXO By HF · #29229 ·
FOX TCXO By HF · #29220 ·
Arduino Shield Kit for WSPR: Timekeeping questions By HF · #29117 ·
OCXO By HF · #29112 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #29111 ·
Dual-band U3S idea By HF · #28855 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #28763 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #28729 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #28721 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #28717 ·
#wspr U3S for 2m WSPR: How to remove the frequency-swing at start of transmission By HF · #28713 ·
I used "silver" solder to assemble my QCX By HF · #28494 ·
QRPlabs Ultimate-3S for 6m and 2m By HF · #28429 ·
Complete Circuit Diagram U3S By HF · #28341 ·
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