Unfortunately I sold my MX-18s a few years ago. If you can't find a used one
then the 17m BitX17a kit from Hendricks QRP might be your best bet.
I have the BITX20A and it's really sweet, especially with the
varicap/ten turn pot tuning mod, which is super simple.
I'm sure that mod will work just as well with the 17m version.
But I am not certain how truly suitable for backpack ops a BITX is.
There are a lot of hand wound ferrite inductors and transformers.
These can be attached to the PC board with hot glue or whatever,
but still....I wonder. Even carried in a nice padded mini Pelican Case, there is always
a lot of jostling about while hiking & climbing, and in packing and unpacking
every time you setup camp. I could very well be wrong, I've never tried using
my 20m BITX backpacking. Too old & feeble, my portable field ops
are out of a tailgate or a "drive in and park" camp site!
LCDR Lane ZeitlerThank You for your service, Lane!
US Naval Hospital
73, Ken AD6KA