Hi Ben:
You had me curious with your request. I started to check my KBPF3 (modified to
the "A") and noticed something that now bothers me. I tried going down from
160M and it appears that the switch over to the AM broadcast band occurs
precisely at 1700,000 Kc. When I tune to 1.699999 the relays click. But the
anomaly(?) I am seeing at the switchover point is a big drop in the signal
level. At my QTH during the daytime the nominal noise level at 1700.000 Kc is
about S7. When I switch to 1.699999 the noise level drops to S2. At the high
end the switchover occurs at 2109.999+ with a drop in the noise level from
S9+10 to S3. I don't use the K3 for listening to AMBCB but only in the case of
checking my 160M receiving loops with some stations high in the AM Band. I
checked on 80M and got similar results. At the low side the switch occurred at
3299.999 with a drop in the noise level from S5 to S2. On the high side the
switchover occurred at 4209.999+ but here the noise level increased from S4 to
S6. I don't know if this helps you any on at least these 2 bands. If I get the
time I'll try to check the rest. Now I'm bothered by the changes in signal
levels at the switchover points (ignorance is bliss). I wonder if anyone else
has ever noticed this or do I have an issue with my KBPF3?
Russ, N3CO
On Friday, April 16, 2021, 12:39:28 PM EDT, w4sc <[email protected]>
wrote:
Looking for details of switch over frequencies and expected performance of the
KBPF3A in its various bands,
There is improvement in the BCB and below 500KHz with the KBPF3A enabled,
however the other SW BCB bands I have tried are lacking.
Has anyone measured the performance of the KBPF3A?
Ben W4SC
Sent from Mail for Windows 10
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