[Elecraft] K4 model v. K3S for strong nearby signal rejection.

[Bob McGraw K4TAX]

We used K3S radios at a Field Day site.  Operated 2 radios on the same 
band with antennas less than 50 yards apart.  No issues. Just be sure 
you use the ATTN and set the RF Gain correctly <<<Very important,  and 
make sure the AGC parameters are not contributing to your issue.  Also, 
don't use the NB and maybe only a little bit of NR.  The radio is really 
bullet proof in these regards.

As to the K4 the K4HD model is the top end for selectivity.

Now if your ham neighbor has a radio that is producing crap, {which many 
are, See the Sherwood article in Nov QST}  wide band noise, and 
splatter, nothing but the power switch will cure the issue as the 
objectionable signal is in the Pass Band of the receiver.   Just 
remember, no amount of filtering or selectivity will eliminate a signal 
in the passband.

73

Bob, K4TAX


On 10/31/2019 4:51 PM, eric norris via Elecraft wrote:
> Can somebody tell me which of the K4 models will produce better blocking of extremely strong (S9+20 to S9+40) nearby in frequency signals than a K3S?  Is this blocking gain compression?  I'm trying to plan a future station upgrade and I have ham neighbors.
> 73. Eric WD6DBM
>