The KX3 "roofing filters" are audio filters. (I wouldn't even call them
"roofing" filters.) They are analog filters, which can improve
rejection of adjacent signals which might overload the ADC. They will
not, however, reject the "audio image", on the other side of zero beat.
I'd expect, especially during contests, the the effect would show up
once in a while, probably making a weak signal totally unintelligible.
Has anyone noticed this effect? Especially on CW, it would be fairly
unlikely, as the interfering signal would have to fall within the narrow
passband on the other side of zero beat.
73,
Scott K9MA
On 1/9/2017 11:54, Ignacy wrote:
Perhaps as it should be. A bigger and more expensive radio is a better radio
but one cannot take the bigger radio everywhere. I assume you had roofing
filters in KX3.
I used KX3 directly driving Expert 1.3k for at Easter Island during CQ WW
SSB and a few days later in CW. KX3 was reliable and worked pretty well. But
I had a feeling that discerning call signs in pileups was a bit worse in
KX3. Also, a better speech processor makes K3 about 1-2 S stronger than KX3
at same peak power so no one can win a SSB contest with KX3. But KX3 is
about 20% weight and 10% of volume.
Ignacy, NO9E
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