[ADXA] OK brain trust - A question

[WB5JJJ]

I have about 60' of RG-8x lying on the floor going from my shack antenna
switcher (2x6) to the recliner in the living room where I'm playing with my
new-to-me IC-7300 getting it ready for RTTY (FSK) this weekend and other
things.  All was A-OK when I turned everything off last night and went to
bed.

I'm using a 40m EFHW to feed the 7300.  This morning, I fired up my station
and the 40m EFHW was still assigned to the 7300.  When I turned the 7300
on, I had a rollercoaster scope display on my waterfall on 160m, 80m, 40m
and KARV-AM (610Khz), at 5,000w and less than 2 miles away, is typically an
S9+50 was only S3.  I changed to the 160m EFHW and all was good.  Went back
to the 40m and still abby-normal operation.  I checked the coax to switch
to the 40m antenna with my RigExpert where the SWR was 1.74:1, so the
antenna had not failed or fallen (I checked the latter).  During all of
this, I reset the 7300 to factory and tried 40m and the EFHW with the same
unusual results.

Now here's the kicker.  When I changed my IC-7610 to the 40m EFHW, all was
normal on it -- no broadband wipeout.  So, I put everything back to normal,
left everything on and went to the PO and a couple of other stops.  When I
got home about an hour later, the 7300 was back to normal for everything.
Could there be a problem with the 7300 or was my 40m EFHW specifically
being attacked by a Solar Flair or whatever that did not affect the other
antennae or the 7610?

Everything is back to normal for now.  40m SSB QSO's are sounding like
normal, and KARV is "bending" my digital S-Meter peg once again.

73's
George - WB5JJJ
HoIP - 100105
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