The attached photo also was posted on Twitter, but I thought it would be a nice one as first posting in this part of this forum!
The transverter depicted below is designed as a real 'BUC' (block up converter) to be positioned near a (multiband) feed.
It uses 432 (or another IF) MHz as IF and is built with 'standard' (Ebay-like) building blocks.
In transmit mode the LO (ADF4351) produces 1968 MHz, is amplified (SPF5189z) and fed to a HMC213 mixer. The wanted RF sideband is filtered with a small ceramic 'WiFi like' block, amplified with a TQP3M9009 and after some
damping fed to a surplus UMTS HPA.
With some fiddling I managed to get >10W O/P on 2400 MHz.
During reception the same LO produces 307.5 MHz, which is fed to a ADE-1 passive mixer. From a GPS-locked PLL LNB (e.g. Octagon 27 MHz, or Starcom 25 MHz) the first IF (739.5 MHz) is fed to the ADE-1 mixer.
After the mixer IF port a J310 provides 'firm' 50 Ohm termination (and somewhat gain, but this is neglectable).
On the photo the LNB GPS-reference is not showed, but it lies here in my work bench ; -) The reference is made from a surplus Jupiter GPS receiver (with 10 kHz reference), an
ADF4001 (PLL) and a low noise VCO. All power supplies in the reference circuitry are heavily filtered ('capacitance multiplification' i.e. emitter followers with large capacitance from the basis to ground).
Both ADF4351 and ADF4001 are programmed by one ATTiny13a.
Yes, the setup is designed as 'simplex'.
Power supply, IF (RX and TX) as well as 'PTT' is fed through one (thick) coax cable.