[Elecraft] KSYN3A tuning noise on 40m

[Arie Kleingeld PA3A]

Hi all,

I just installed two new KSYN3A's in K3 #1255. I found high tuning noise 
on 40m.

First case:
On 40m S-3 tuning noise in the MAIN RX while tuning the MAIN RX

To reproduce:
mode: SSB, normal bandwidth
freq: 7000 -7200
no antenna connected
pre-amp off
att off
full RF gain
AGC-S
VFO tuning noise reduction Mod has no effect.


Second case, with SUB RX on:
Listening on MAIN RX
Same tuning noise audible on MAIN RX while tuning the SUB RX


Third case, with SUB RX on:
Listening on SUB RX
SUB RX has no tuning noise, neither tuning the SUB RX nor tuning the MAIN RX

(I switched the two SYNT3A's, main to sub, sub to main: NO difference)


Can anyone confirm this, or is #1255 unique in this?

73
Arie PA3A