David,
Your observation says that there is between 20 and 40 dB of isolation
between ANT3 and the other two KAT500 ANT jacks. That does not surprise
me at all, even though 20 dB may be on the low side.
73,
Don W3FPR
On 11/2/2013 11:17 PM, David Christ wrote:
I recently added a KAT500 to my K3, P3, and KPA500. I need some help
understanding what I am hearing. The KAT500 was installed as recommended by
Elecraft. The KPA500 is connected to the input, my hexagonal beam to antenna
1, my 40 meter dipole to antenna2, and nothing to antenna 3.
With the K3 tuned to about 7.075 MHz I observe the following:
If I disconnect my K3 from the KPA500 and either leave it unconnected or
connect it to my dummy load the noise level shown on the P3 is about -140 db
and no signals are seen or heard.
With the K3 connected to the KPA500 as normal connecting to antenna 2 (40 m
dipole) the noise level is -110 db and signals are peaking at about -60.
Connected to antenna 1 (hexagonal beam) the noise level is -120 and signals
are peaking at -80.
When I switch to antenna 3 (no connection) noise is -140 db and signals are
peaking at -100. This is the surprise. I did not expect to see such strong
signals coming through with no antenna connected. This is also true when the
dummy antenna is connected to antenna 3. What am I hearing here? should I be
hearing this? I have some guesses but don't want to state them here yet in
order to not bias people's minds.
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