Chances are it is an image signal beacause RHC is broadcasting then.
The combination of a modestly priced but very sensitive receiver and
big antenna means you are probably getting repeat signals all over the
dial. Because the 350 is an analog receiver with a digital display my
guess is that the receiver is actually tuned to 1700 +- 10.

Try listening to these RHC frequencies to see if the signal is the
same.
6000, 6060, 9550, 11760

It's a nice radio in many respects, but it has limitations that are a
fuction of it's price. More than one review I have read complain about
multiple images, poor dynamic range, etc. Get rid of that long antenna
and use the RF gain to control signal strength.



Honus wrote:
It's Sunday here in Seattle, 0530 UTC and I'm picking up Radio Havana
Cuba
on a Grundig S350 with a 70' random wire antenna tuned to ~1697 KHz.
(The
signal drifts a tiny bit, between 1696 to 1698.) I've tried to do my
own
research and see if perhaps they broadcast on MW as well as SW, but I
can't
find any indications that they do. They're also frequently mentioning
that
it's a shortwave broadcast...so through what bit of electronic
inadequacies
on the part of Grundig am I hearing this on MW? I understand images
to a
degree, thanks to r.r.s. Is this a related issue? Thanks in advance.