Just an FYI, I found out what the problem is with my modified KBPF3. I
removed the added caps and signal levels returned to somewhat normal levels.
Adding a cap to C2 didn't make sense and attenuated the signals. But Fig. 14
shows adding a cap to C4. Apparently the ham I bought this from us
Thanks Ben, I didn't think of that. Now when the KBPF3 is not inst There is
no difference in signal level when transitioning from 1.700 to 1.69. And
when I set the KBPF3 to nor (and reboot) there is a definite drop of 5-7 S
units at the 1.700 transition point and also at the the 2.11 to 2
When setting installed/ NOT installed, make sure you reboot….
Ben
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Brian,Thanks for your information which got me thinking again about my
situation. I went back and set the config for the KBPF3 to "not inSt" and
found no difference at the signal levels at the switchover at 1700 Kc.
Toggling back and forth between "not inSt" and "nor" I verified that there i
This thread also got my curiosity up. Several years ago I upgraded my
K3 #41xx with the KBPF3 including the 'A' mod of the capacitor on the RF
board. I never really checked it out except for the 630 meter coverage
and transmit capability - both were as advertised.
Using a wideband noise gene
Russ,
Unfortunately, it appears you may have a defective KBPF3A. (Modified KBPF3). I
actually see a slight increase in band noise below 1.7MHz with my K3S-100,
which has KBPF3A installed.
Ben W4SC
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A little back ground,,
The effort started as a result of my using WWV at 15.00 MHz for calibrating
the reference oscillator. Tuning from 14.99 to 15.00 MHz I noticed a 9
to 12 Db drop in signal strength of WWV.
I could hear relays’ switching at the 14.99 to 15.00 MHz boun
Hi Knut:
I couldn't tell you if this is a new problem as I didn't notice anything amiss
until I started checking switchover frequencies to answer W4SC's question. I
verified that the KBPF3 is enabled in the config menu. I bought the used
KBPF3 about 4-5 years ago from another ham and don't r
Hi Russ,
Your response made *very* curious so I checked out my own K3S. I can confirm
the two switchover frequencies you mention (1700 and 3300kHz), but observe
at most a couple of dB change when crossing the boundaries. I use an
external panadapter (LP-PAN/NaP3 connected to IF-OUT) so I can easil
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 1.69 the
Hi Ben,
Others with more knowledge may chime in, but here is what I know:
The crossover frequencies you can find in the K3S schematic file. Here is a
link to it:
https://ftp.elecraft.com/K3S/Manuals%20Downloads/E740323%20K3s%20Schematic%20Files.pdf
It is the first page in the "options" segment.
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
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