Panadapter for IC-756 PRO3
Connect an SDR Dongle at the 1st IF of the IC-756 PRO3 is an easy job.
There is an unused TMP connector on the RF-B board that can be used: J1651
J1651 is just after the main and sub 1st IF amplifier and the signal is tapped with a 5pF capacitor, so only a short coax pigtail is needed.
The unused external tuner power connector has been moved inside the rig and 2 small pieces of FR4 copper board are used for support the SMA connector.
This mod, if needed, can be removed in few minutes without any sign on the rig.
The 1st IF is at 64.455 Mhz, is connected directly to the dongle and all is working ok, just to be sure I will insert a buffer amp and a filter.
EDIT 06/03/2014: added a passband filter centered on 64.455 MHz and a buffer with MAX2650 mmic powered via USB cable.
Here a screenshot just taken, nice 6m TEP opening.