I contacted Sinclair about the I1 circulator available in ZL-land. Here is their response: " These circulators are built to order and have a very narrow tuning range. I checked with our technicians and we are not sure how you came to have one at 47 MHz, but they don't believe that we will be able to retune it to 53.75 MHz. And unfortunately because this new frequency is below 60 MHz, I can't even provide you with a quote for a new circulator.
I continue working with EMR for a custom unit. Regards, Dan at K7MM, VU3MMW
