The one big improvement in the K3S, mainly due to the new synthesiser, is the ability to tune it down to 100kHz. The original K3 hardware only went down to 479kHz. Using the K3S properly at these frequencies requires the installation of a KBPF3A. The original KBPF3 does not go down low enough in frequency, but can be easily modified.
As the filter board was not available we stuck a 40dB amplifier between the low 80m dipole and the RX Ant input, to make up for the loss in the normal K3S 1.5MHz highpass filter. The results on WSPR using the K3S internal soundcard were impressive:-
Date Call SNR Drift Grid dbm km
2016-03-09 04:56 WH2XND -21 0 DM33xt +43 1431
2016-03-09 04:52 WH2XGP -25 0 DN07dg +40 2499
2016-03-09 04:50 WG2XIQ +10 0 EM12mp +37 60
2016-03-09 04:48 WG2XXM +0 0 EM15lj +37 258
2016-03-09 04:44 WD2XSH/15 -23 1 EM34rt +33 422
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