VLF to HF Converter Unit, Nice parts! Removed from WJ equipment

Description

Here is a board from box made by Watkins Johnson for telephone intercept work, type TFC-212. It upconvert the VLF range to HF frequencies using a crystal controlled oscillator usinga  WJ/Relcom M6 double balanced mixer on it that covers from below 100 KHz to 300 MHz and these are easily removed if you so desire.  The unit is in good physical condition and I am selling it for parts as I do not think too many people are interested in demuxing FDM (but if you are, I have a whole 960 channel system for it 12 channels by 5 group by 16 supergroups...).  Have fun!