This time for 3398.00 MHz, we have opted for a nice little unit made by SG Labs. see below.
“We developed and tested successfully 3.4 GHz / 9cm transverter.
The design is similar to our 13cm band transverter. Now we start the
production , lead time is 4-5 weeks.
The price is 240 Euro +10 Euro for shipping to VK.
Output power is 3+ Watts .”
Also VK3FS has written a blog containing specifications, with a tube test on this transverter so please give It a look : see here.