What is the passband of the filtering engaged in the KBPF3 when
operating at 630M? The concern at this band in many locations is BCB
intermod, and generally an LPF is used in the RX chain. Is it not of
concern based on on-air tests, perhaps KBPF3 is on the table for an
upgrade, or an outbound LPF recommended?
73 Eric NO3M (experimental 630M license: WG2XJM)
On 02/13/2015 01:27 PM, Wayne Burdick wrote:
Q: What is the K3's 100-490 kHz receive sensitivity? What signals would I find
in this range?
A: With preamp OFF, we measured about -125 dBm at 475 kHz and -90 dBm at 250
kHz. We have not measured MDS below 250 kHz, but the receiver will gradually
become less sensitive as you go lower in frequency due to band-pass filter
rolloff (in the KBPF3, which is required for operation below 160 meters). These
tests were made with the signal routed through the RX ANT IN or XVTR IN jacks
on the KXV3 option module. The preamp is not effective in this range and must
be turned off. A sub receiver (KRX3) fitted with a KBPF3 should have similar
performance, whether the signal is obtained from the main path (KXV3) or from
the sub's AUX RF input.
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